UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM N-CSR

              CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT
                              INVESTMENT COMPANIES

Investment Company Act file number   811-5531
                                   ---------------------------------------------



                       MassMutual Participation Investors
--------------------------------------------------------------------------------
               (Exact name of registrant as specified in charter)


          1500 Main Street, P.O. Box 15189, Springfield, MA 01115-5189
--------------------------------------------------------------------------------
              (Address of principal executive offices) (Zip code)


             Christopher A. DeFrancis, Vice President and Secretary
    1500 Main Street, Suite 2800, P.O. Box 15189, Springfield, MA 01115-5189
--------------------------------------------------------------------------------
                    (Name and address of agent for service)


Registrant's telephone number, including area code:  413-226-1000
                                                    ----------------------------

Date of fiscal year end:  12/31
                          ------------------

Date of reporting period: 12/31/10
                          ------------------

Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the transmission to stockholders of
any report that is required to be transmitted to stockholders under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-CSR
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 110 F Street NE,
Washington, DC 20549. The OMB has reviewed this collection of information under
the clearance requirements of 44 U.S.C. ss. 3507.


ITEM 1.  REPORT TO STOCKHOLDERS.

Attached hereto is the annual shareholder report transmitted to shareholders
pursuant to Rule 30e-1 of the Investment Company Act of 1940, as amended.






[LOGO]  MASSMUTUAL PARTICIPATION INVESTORS
        2010 ANNUAL REPORT






























MASSMUTUAL PARTICIPATION INVESTORS
c/o Babson Capital Management LLC
1500 Main Street
P.O. Box 15189
Springfield, Massachusetts 01115-5189
(413) 226-1516
http://www.BabsonCapital.com/mpv

ADVISER
Babson Capital Management LLC
1500 Main Street, P.O. Box 15189
Springfield, Massachusetts 01115-5189

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
KPMG LLP
Boston, Massachusetts 02110

COUNSEL TO THE TRUST
Ropes & Gray LLP
Boston, Massachusetts 02110

CUSTODIAN
Citibank, N.A.
New York, New York 10043

TRANSFER AGENT & REGISTRAR
Shareholder Financial Services, Inc.
P.O. Box 173673
Denver, Colorado 80217-3673
1-800-647-7374

 MPV
Listed
 NYSE


PROXY VOTING POLICIES & PROCEDURES;
PROXY VOTING RECORD

The Trustees of MassMutual Participation Investors (the "Trust") have delegated
proxy voting responsibilities relating to the voting of securities held by the
Trust to Babson Capital Management LLC ("Babson Capital"). A description of
Babson Capital's proxy voting policies and procedures is available (1) without
charge, upon request, by calling, toll-free 1-866-399-1516; (2) on the Trust's
website at http://www.BabsonCapital.com/mpv; and (3) on the U.S. Securities and
Exchange Commission's ("SEC") website at http://www.sec.gov. Information
regarding how the Trust voted proxies relating to portfolio securities during
the most recent 12-month period ended June 30, 2010 is available (1) on the
Trust's web-site at http://www.BabsonCapital.com/mpv; and (2) on the SEC's
website at http://www.sec.gov.

FORM N-Q

The Trust files its complete schedule of portfolio holdings with the SEC for the
first and third quarters of each fiscal year on Form N-Q. This information is
available (i) on the SEC's website at http://www.sec.gov; and (ii) at the SEC's
Public Reference Room in Washington, DC (which information on their operation
may be obtained by calling 1-800-SEC-0330). A complete schedule of portfolio
holdings as of each quarter-end is available on the Trust's website at http://
www.BabsonCapital.com/mpv or upon request by calling, toll-free, 1-866-399-1516.

OFFICERS OF THE TRUST

Clifford M. Noreen
Chairman

Michael L. Klofas
President

Michael P. Hermsen
Vice President

Richard E. Spencer, II
Vice President

Jill A. Fields
Vice President

James M. Roy
Vice President
& Chief Financial
Officer

Christopher A. DeFrancis
Vice President &
Secretary

MASSMUTUAL PARTICIPATION INVESTORS

MASSMUTUAL PARTICIPATION INVESTORS IS A CLOSED-END INVESTMENT COMPANY, FIRST
OFFERED TO THE PUBLIC IN 1988, WHOSE SHARES ARE TRADED ON THE NEW YORK STOCK
EXCHANGE.

INVESTMENT OBJECTIVE & POLICY

MassMutual Participation Investors (the "Trust") is a closed-end investment
company, first offered to the public in 1988, whose shares are traded on the New
York Stock Exchange under the trading symbol "MPV". The Trust's share price can
be found in the financial section of most newspapers as "MassPrt" or "MassMuPrt"
under either the New York Stock Exchange listings or Closed-End Fund listings.

The Trust's investment objective is to maximize total return by providing a high
level of current income, the potential for growth of income, and capital
appreciation. The Trust's principal investments are privately placed,
below-investment grade, long-term debt obligations purchased directly from their
issuers, which tend to be smaller companies. At least half of these investments
normally include equity features such as warrants, conversion rights, or other
equity features that provide the Trust with the opportunity to realize capital
gains. The Trust will also invest in publicly traded debt securities (including
high yield securities), again with an emphasis on those with equity features,
and in convertible preferred stocks and, subject to certain limitations, readily
marketable equity securities. Below-investment grade or high yield securities
have predominantly speculative characteristics with respect to the capacity of
the issuer to pay interest and repay principal. In addition, the Trust may
temporarily invest in high quality, readily marketable securities.

Babson Capital Management LLC ("Babson Capital") manages the Trust on a total
return basis. The Trust distributes substantially all of its net income to
shareholders each year. Accordingly, the Trust pays dividends to shareholders
quarterly in January, May, August, and November. All registered shareholders are
automatically enrolled in the Dividend Reinvestment and Cash Purchase Plan
unless cash distributions are requested.

In this report you will find a complete listing of the Trust's holdings. We
encourage you to read this section carefully for a better understanding of the
Trust. We cordially invite all shareholders to attend the Trust's Annual Meeting
of Shareholders, which will be held on April 15, 2011 at 1:30 P.M. in
Springfield, Massachusetts.

                                                                     (Continued)
--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT             1

PORTFOLIO COMPOSITION AS OF 12/31/10*

                            [PIE CHART APPEARS HERE]

Private / 144A             Public High
High Yield Debt            Yield Debt
69.1%                      8.8%

Private / Restricted       Public Equity
Equity                     0.1%
12.0%

Cash & Short-Term
Investments
10.0%



TOTAL ANNUAL PORTFOLIO RETURN (AS OF 12/31 EACH YEAR)*

                            [BAR CHART APPEARS HERE]

                                                  
8.11    3.41    5.70    23.72   25.14   22.51   18.64   9.95   -6.01   7.60    18.71     MassMutual Participation Investors
                                                                                         (Based on change in the net asset
                                                                                         value with reinvested dividends)

-3.03   2.49   -20.48   47.25   18.33   4.55    18.37   -1.57  -33.79  27.17    26.86    Russell 2000 Index

-5.86   5.28   -1.41    28.97   11.13   2.74    11.85   1.87   -26.16  58.21    15.13    Barclays Capital U.S.
                                                                                         Corporate High Yield Index
2000    2001    2002    2003    2004    2005    2006    2007    2008    2009    2010


* Data for MassMutual Participation Investors (the "Trust") represents portfolio
returns based on change in the Trust's net asset value assuming the reinvestment
of all dividends and distributions. These returns differ from the total
investment return based on market value of the Trust's shares due to the
difference between the Trust's net asset value and the market value of its
shares outstanding (see page 12 for total investment return based on market
value). Past performance is no guarantee of future results.

--------------------------------------------------------------------------------
2            MassMutual Participation Investors 2010 ANNUAL REPORT


TO OUR SHAREHOLDERS
I am pleased to share with you the Trust's Annual Report for the year ended
December 31, 2010.

PORTFOLIO PERFORMANCE
The Trust's net total portfolio rate of return for 2010 was 18.71%, as measured
by the change in net asset value and assuming the reinvestment of all dividends
and distributions. The Trust's total net assets were $119,540,235, or $11.89 per
share, as of December 31, 2010. This compares to $108,925,375, or $10.91 per
share, as of December 31, 2009. The Trust paid a quarterly dividend of 25 cents
per share for each of the four quarters of 2010. Including the fourth quarter
dividend paid in January 2011, total dividends for the year were $1.00 per
share, which was unchanged from the prior year. Net investment income for the
year was $1.02 per share, including $0.04 per share of non-recurring income,
which was up 9% from $0.94 per share in 2009. Investors took note of the strong
performance in 2010 as the Trust's stock price increased 13.8% during the year,
from $12.20 as of December 31, 2009 to $13.88 as of December 31, 2010.

The table below lists the average annual net returns of the Trust's portfolio,
based on the change in net assets and assuming the reinvestment of all dividends
and distributions. Average annual returns of the Barclays Capital U.S. Corporate
High Yield Index and the Russell 2000 Index for the 1, 3, 5 and 10 years ended
December 31, 2010 are provided for comparison purposes only.

                             BARCLAYS CAPITAL
                            U.S. CORPORATE HIGH        RUSSELL
              THE TRUST        YIELD INDEX            2000 INDEX
-----------------------------------------------------------------------
1 Year          18.71%            15.13%                26.86%
-----------------------------------------------------------------------
3 Years          6.28%            10.38%                 2.22%
-----------------------------------------------------------------------
5 Years          9.39%             8.91%                 4.47%
-----------------------------------------------------------------------
10 Years        12.50%             8.88%                 6.33%
-----------------------------------------------------------------------
Past performance is no guarantee of future results.


--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT             3

MARKET CONDITIONS
The year 2010 opened with nervous investors unable to shake their fears of a
double-dip recession even though the global economy entered its second year of
recovery. Despite these worries, investors stayed the course and markets
continued to improve until mid-spring, when financial troubles facing several
European nations raised concerns around the globe. As markets stalled,
governments and central banks once again stepped to the fore to help restore
investor confidence. The U.S. economy was further bolstered at year-end by
extensions of investor-friendly tax policies, helping to close the year on a
strong note. The Dow Jones Industrial Average gained 11% for the year to 11,577,
a level not seen since September 2008. The market's strong performance occurred
in the latter part of the year, as the Dow rose 18.5% in the final six months,
and 7.3% in the fourth quarter.

Despite the strong finish, concerns remain for the U.S. economy. The
unemployment rate, according to the U.S. Department of Labor, ended 2010 at
9.8%, down slightly from 10% in 2009, but still stubbornly high. Inflation was
just under 1.5%, down significantly from 2.7% in 2009, but history has shown
that significant fiscal stimulus often leads to inflation. The current fiscal
policy and the growing national debt also worry investors and companies alike
about potential tax hikes, which might be required at some point to pay
principal and interest on the debt. The value of the dollar improved overall
versus the currencies of the main U.S. trading partners in 2010, although much
of that was due to the negative impact on the euro given financial troubles for
several European countries; the dollar's performance against other currencies
was mixed. One welcome sign was corporate credit defaults, which plummeted in
2010. Moody's Investors Service global issuer-weighted speculativegrade default
rate was 3.1% in 2010, down dramatically from 12.5% in 2009. The current rate is
more in line with its historical average of 5%, and Moody's predicts defaults
will fall even lower - to below 2% - in 2011.

PORTFOLIO ACTIVITY
New investment activity for the Trust was very sporadic during 2010. In the
first three quarters of the year, the Trust completed eight new private
placement investments. In the fourth quarter, the Trust completed 11 new
investments, including seven in the month of December alone. This high level of
transaction volume in the fourth quarter was driven mostly by concerns about
potential tax law changes, although pent-up demand from private equity and
corporate buyers also contributed. For the full year 2010, the Trust closed 19
new private placement investments and eight add-on investments in existing
portfolio companies. Total private placement investment purchases in 2010 were
$18,434,897. In 2009, the Trust closed ten new private placement transactions
and seven add-on investments aggregating $13,887,651.

We are certainly pleased with the high level of investment activity in 2010 as
this should have a positive impact on net investment income in the years ahead.
We are also very pleased to report that leverage multiples, though they
increased as the year progressed, remained reasonable despite the increased
level of market activity. Pricing and return expectations on our new investments
were stable throughout the year. All in all, market conditions in 2010 were
favorable for new investment activity.

New private placement investments completed during 2010 were: Associated
Diversified Services; Barcodes Group, Inc.; Eatem Holding Company; F F C Holding
Corporation; F G I Equity LLC; F H Equity LLC; G C Holdings; J A C Holding
Enterprises, Inc.; K P H I Holdings, Inc.; Manhattan Beachwear Holding Company;
MBWS Ultimate Holdco, Inc.; Motion Controls Holding; Nicoat Acquisitions LLC; O
E C Holding Corporation; P P T Holdings LLC; Snacks Parent Corporation; Sunrise
Windows Holding Co.; Wheaton Holding Corporation; and Whitcraft Holdings, Inc.
In addition, the Trust added to existing private placement investments in A S C
Group, Inc.; F C X Holdings Corporation; Manhattan Beachwear Holding Company;
Northwest Mailing Services, Inc.;

--------------------------------------------------------------------------------
4            MassMutual Participation Investors 2010 ANNUAL REPORT

P K C Holding Corporation; Pacific Consolidated Holdings LLC; Postle Aluminum
Company LLC; and Savage Sports Holding, Inc. A brief description of these
investments can be found in the Consolidated Schedule of Investments.

The condition of the Trust's existing portfolio of investments improved
significantly during 2010. Sales and earnings for most of the Trust's portfolio
companies increased in 2010, after showing a deteriorating trend for all of
2009. We also had a number of portfolio companies resume paying cash interest on
their debt obligations due to their improved operating performance and liquidity
position. Patience, sometimes coupled with additional equity infusions from the
sponsor groups and/or the deferral of interest on debt obligations, has proven
to be the right approach to helping many of these companies rebound.

We also had 12 companies exit from the Trust's portfolio during 2010. In nine of
these exits, the Trust realized a significant positive return on its investment.
These investments were: Dwyer Group, Inc.; ITC^Deltacom, Inc.; K-Tek Holding
Corporation; Maverick Acquisition Company; PAS Holdco LLC; Tangent Rail
Corporation; Transtar Holding Company; Waggin' Train Holdings LLC; and Walls
Industries, Inc. We also realized on our investments in Diversco, Inc., FHS
Holdings LLC, and Olympic Sales, Inc. Realization activity for the Trust's
portfolio in 2010 was at its highest level since 2007.

OUTLOOK FOR 2011
The year 2011 opened with cautious optimism, as recovery continues in both the
U.S. and emerging markets. Europe, however, is again focusing on those nations
with troubled finances and may need to take stronger action with the debts of
some. On the home front, public sector employment may take a hit as states,
cities and towns deal with their budget woes. And housing remains the albatross
around the neck of the U.S. economy. Home sales remain at depressed levels while
the inventory of new and existing homes continues to be well above average,
although down from peak levels. Delays in the foreclosure process have only
exacerbated the problem.

On the positive side, U.S. companies are reporting strong profits, banks are
making more loans, and consumer spending is on the upswing, although not yet
enough to make a major dent in unemployment levels. The economy is expected to
continue to improve, although regions vary in their respective speed of
recovery. The Federal Reserve has been priming the pump along the way and
government policies have been supportive of growth and job generation.

Although the buyout market is taking a breather after the hectic pace of deal
activity at the end of 2010, we have begun 2011 with a reasonable backlog of new
investment opportunities and an expectation that leverage and pricing conditions
will continue to be favorable for the Trust. We also have a number of portfolio
companies that are in various stages of a sale process. We expect that
realization activity, which started to rebound in the fourth quarter of 2009 and
accelerated through 2010, will continue to be strong in 2011.

--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT             5


The Trust weathered the difficult markets of 2008 and early 2009 well, and was
able to maintain its dividend level. With market conditions continuing to
improve, the Trust generated strong results in 2010, and we are optimistic
heading into 2011. Regardless of the market environment, however, the Trust will
continue to employ the investment philosophy that has served it well since its
inception: investing in companies which we believe have a strong business
proposition, solid cash flow and experienced, ethical management. This
philosophy, along with Babson Capital's seasoned investment-management team,
positions the Trust well to meet its investment objectives and policies. As
always, I would like to thank you for your continued interest in and support of
MassMutual Participation Investors. I look forward to seeing you at the Trust's
annual shareholder meeting in Springfield on April 15, 2011.

Sincerely,

Michael L. Klofas
President

Cautionary Notice: Certain statements contained in this report may be "forward
looking" statements. Investors are cautioned not to place undue reliance on
forward-looking statements, which speak only as of the date in which they are
made and which reflect management's current estimates, projections, expectations
or beliefs, and which are subject to risks and uncertainties that may cause
actual results to differ materially. These statements are subject to change at
any time based upon economic, market or other conditions and may not be relied
upon as investment advice or an indication of the Trust's trading intent.
References to specific securities are not recommendations of such securities,
and may not be representative of the Trust's current or future investments. We
undertake no obligation to publicly update forward looking statements, whether
as a result of new information, future events, or otherwise.



2010               RECORD         NET INVESTMENT   SHORT-TERM       TAX          LONG-TERM
DIVIDENDS           DATE              INCOME          GAINS        EFFECT          GAINS
-----------------------------------------------------------------------------------------
                                                                    
Regular          4/26/2010            0.2500              -                             -
                  8/2/2010            0.2500              -                             -
                 11/1/2010            0.2500              -                             -
                12/31/2010            0.2500              -                             -
-----------------------------------------------------------------------------------------
                                    $ 1.0000            $ -        $ 1.0000        0.0000
-----------------------------------------------------------------------------------------

THE FOLLOWING TABLE SUMMARIZES THE TAX EFFECTS OF THE RELATION OF CAPITAL GAINS
FOR 2010:

                                                AMOUNT PER SHARE              FORM 2439
-----------------------------------------------------------------------------------------
2010 Gains Retained                                  0.0692                     Line 1a
Long-Term Gains Retained                             0.0692
Taxes Paid                                           0.0242                     Line 2 *
Basis Adjustment                                     0.0450                           **
-----------------------------------------------------------------------------------------

*  If you are not subject to federal capital gains tax (e.g. charitable
   organizations, IRAs and Keogh Plans) you may be able to claim a refund by
   filing Form 990-T.
** For federal income tax purposes, you may increase the adjusted cost basis of
   your shares by this amount (the excess of Line 1a over Line 2).



                  QUALIFIED FOR DIVIDEND                                     INTEREST EARNED ON
ANNUAL DIVIDEND    RECEIVED DEDUCTION***       QUALIFIED DIVIDENDS****     U.S. GOV'T. OBLIGATIONS
   AMOUNT                       AMOUNT                         AMOUNT                    AMOUNT
 PER SHARE       PERCENT       PER SHARE        PERCENT       PER SHARE     PERCENT     PER SHARE
-------------------------------------------------------------------------------------------------
                                                                        
   $1.00         2.8404%         0.0283         2.8404%         0.0283         0%         0.0000
-------------------------------------------------------------------------------------------------

***  Not available to individual shareholders
**** Qualified dividends are reported in Box 1b on IRS Form 1099-Div for 2010

--------------------------------------------------------------------------------
6            MassMutual Participation Investors 2010 ANNUAL REPORT




        FINANCIAL REPORT

        CONSOLIDATED STATEMENT OF ASSETS AND LIABILITIES                       8

        CONSOLIDATED STATEMENT OF OPERATIONS                                   9

        CONSOLIDATED STATEMENT OF CASH FLOWS                                  10

        CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS                      11

        CONSOLIDATED FINANCIAL HIGHLIGHTS                                     12

        CONSOLIDATED SCHEDULE OF INVESTMENTS                               13-40

        NOTES TO CONSOLIDATED FINANCIAL STATEMENTS                         41-45

        REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM               46

        INTERESTED TRUSTEES                                                47-48

        INDEPENDENT TRUSTEES                                               49-51

        OFFICERS OF THE TRUST                                                 52



--------------------------------------------------------------------------------

CONSOLIDATED STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 2010

ASSETS:
Investments
        (See Consolidated Schedule of Investments)
   Corporate restricted securities at fair value
        (Cost - $117,988,681)                                     $ 107,507,131
   Corporate restricted securities at market value
        (Cost - $1,126,931)                                           1,161,608
   Corporate public securities at market value
        (Cost - $11,559,989)                                         11,951,028
   Short-term securities at amortized cost                           10,049,511
                                                                  -------------
        Total investments (Cost - $140,725,112)                     130,669,278
Cash                                                                  3,331,474
Interest receivable                                                   1,329,830
                                                                  -------------
        TOTAL ASSETS                                                135,330,582
                                                                  -------------
LIABILITIES:
Dividend payable                                                      2,512,568
Investment advisory fee payable                                         268,592
Note payable                                                         12,000,000
Interest payable                                                         88,933
Accrued expenses                                                        175,336
Accrued taxes payable                                                   463,325
Deferred tax liability                                                  264,465
Other payables                                                           17,128
                                                                  -------------
        TOTAL LIABILITIES                                            15,790,347
                                                                  -------------
        TOTAL NET ASSETS                                          $ 119,540,235
                                                                  =============

NET ASSETS:
Common shares, par value $.01 per share                           $     100,503
Additional paid-in capital                                           93,832,939
Retained net realized gain on investments, prior years               32,871,737
Undistributed net investment income                                   1,608,268
Accumulated net realized gain on investments                          1,447,087
Net unrealized depreciation of investments                          (10,320,299)
                                                                  -------------
        TOTAL NET ASSETS                                          $ 119,540,235
                                                                  =============
COMMON SHARES ISSUED AND OUTSTANDING (14,785,750 AUTHORIZED)         10,050,271
                                                                  =============
NET ASSET VALUE PER SHARE                                         $       11.89
                                                                  =============

See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
8            MassMutual Participation Investors 2010 ANNUAL REPORT

CONSOLIDATED STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 2010


INVESTMENT INCOME:
Interest                                                          $  12,311,210
Dividends                                                               284,743
Other                                                                    42,707
                                                                  -------------
        TOTAL INVESTMENT INCOME                                      12,638,660
                                                                  -------------

EXPENSES:
Investment advisory fees                                              1,050,151
Interest                                                                696,000
Trustees' fees and expenses                                             222,153
Professional fees                                                       149,500
Reports to shareholders                                                  92,000
Custodian fees                                                           22,000
Transfer agent/registrar's expenses                                      21,500
Other                                                                   118,928
                                                                  -------------
        TOTAL EXPENSES                                                2,372,232
                                                                  -------------
INVESTMENT INCOME - NET                                              10,266,428
                                                                  -------------

NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS:
Net realized gain on investments before taxes                         1,707,746
Income tax expense                                                     (528,092)
                                                                  -------------
        Net realized gain on investments after taxes                  1,179,654
                                                                  -------------
Net change in unrealized depreciation of investments before taxes     8,545,462
Net change in deferred income tax expense                              (179,502)
                                                                  -------------
Net change in unrealized depreciation of investments after taxes      8,365,960
                                                                  -------------
        NET GAIN ON INVESTMENTS                                       9,545,614
                                                                  -------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS              $  19,812,042
                                                                  =============

See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT             9

CONSOLIDATED STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED DECEMBER 31, 2010

NET INCREASE IN CASH:
Cash flows from operating activities:
   Purchases/Proceeds/Maturities from short-term portfolio
     securities, net                                              $  (2,516,100)
   Purchases of portfolio securities                                (31,361,604)
   Proceeds from disposition of portfolio securities                 33,738,236
   Interest, dividends and other income received                     11,842,095
   Interest expense paid                                               (696,000)
   Operating expenses paid                                           (1,675,204)
   Income taxes paid                                                   (100,767)
                                                                  -------------
      NET CASH PROVIDED BY OPERATING ACTIVITIES                       9,230,656
                                                                  -------------

Cash flows from financing activities:
   Cash dividends paid from net investment income                   (10,009,346)
   Receipts for shares issued on reinvestment of dividends              828,922
                                                                  -------------
      NET CASH USED FOR FINANCING ACTIVITIES                         (9,180,424)
                                                                  -------------

NET INCREASE IN CASH                                                     50,232
Cash - beginning of year                                              3,281,242
                                                                  -------------
CASH - END OF YEAR                                                $   3,331,474
                                                                  =============

RECONCILIATION OF NET INCREASE IN NET ASSETS TO NET
CASH PROVIDED BY OPERATING ACTIVITIES:

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS              $  19,812,042
                                                                  -------------
   Increase in investments                                          (11,427,217)
   Decrease in interest receivable                                      192,365
   Decrease in receivable for investments sold                           45,613
   Increase in investment advisory fee payable                           23,510
   Increase in accrued expenses                                          18,509
   Increase in accrued taxes payable                                    606,827
   Decrease in other payables                                           (40,993)
                                                                  -------------
      TOTAL ADJUSTMENTS TO NET ASSETS FROM OPERATIONS               (10,581,386)
                                                                  -------------
      NET CASH PROVIDED BY OPERATING ACTIVITIES                     $ 9,230,656
                                                                  =============


See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
10           MassMutual Participation Investors 2010 ANNUAL REPORT

CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS
FOR THE YEARS ENDED DECEMBER 31, 2010 AND 2009


                                                                      2010              2009
                                                                  -------------     -------------
                                                                              
INCREASE (DECREASE) IN NET ASSETS:

Operations:
    Investment income - net                                       $  10,266,428     $   9,375,528
    Net realized gain on investments after taxes                      1,179,654         1,012,575
    Net change in unrealized depreciation of investments
      after taxes                                                     8,365,960        (2,299,878)
                                                                  -------------     -------------
    Net increase in net assets resulting from operations             19,812,042         8,088,225

Increase from common shares issued on reinvestment of dividends
    Common shares issued (2010 - 67,032; 2009 - 55,996)                 828,922           616,488

Dividends to shareholders from:
    Net investment income (2010 - $1.00 per share;
                           2009 - $1.00 per share)                  (10,026,104)       (9,955,268)
                                                                  -------------     -------------

    TOTAL INCREASE (DECREASE) IN NET ASSETS                          10,614,860        (1,250,555)

NET ASSETS, BEGINNING OF YEAR                                       108,925,375       110,175,930
                                                                  -------------     -------------

NET ASSETS, END OF YEAR (including undistributed net investment
income of $1,608,268 and $1,272,124 respectively)                 $ 119,540,235     $ 108,925,375
                                                                  =============     =============




See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            11

CONSOLIDATED SELECTED FINANCIAL HIGHLIGHTS
SELECTED DATA FOR EACH SHARE OF BENEFICIAL INTEREST OUTSTANDING:


                                                        FOR THE YEARS ENDED DECEMBER 31,
                                            --------------------------------------------------------
                                              2010        2009        2008        2007        2006
                                            --------------------------------------------------------
                                                                             
Net asset value:
   Beginning of year                        $  10.91    $  11.10    $  12.84    $  12.90    $  12.21
                                            --------    --------    --------    --------    --------
Net investment income (a)                       1.02        0.94        1.08        1.23        1.10
Net realized and unrealized
   gain (loss) on investments                   0.95       (0.13)      (1.82)      (0.05)       0.77
                                            --------    --------    --------    --------    --------
Total from investment operations                1.97       (0.81)      (0.74)       1.18        1.87
                                            --------    --------    --------    --------    --------
Dividends from net investment
   income to common shareholders               (1.00)      (1.00)      (1.00)      (1.23)      (1.18)
Dividends from net realized gain
   on investments to common shareholders           -           -           -       (0.02)      (0.01)
Increase from dividends reinvested              0.01        0.00(b)     0.00(b)     0.01        0.01
                                            --------    --------    --------    --------    --------
Total dividends                                (0.99)      (1.00)      (1.00)      (1.24)      (1.18)
                                            --------    --------    --------    --------    --------
Net asset value: End of year                $  11.89    $  10.91    $  11.10    $  12.84    $  12.90
                                            --------    --------    --------    --------    --------
Per share market value:
   End of year                              $  13.88    $  12.20    $   9.05    $  13.18    $  14.70
                                            ========    ========    ========    ========    ========
Total investment return
   Net asset value (c)                        18.71%       7.60%      (6.01%)      9.95%      18.64%
   Market value (c)                           22.94%      40.86%     (25.36%)     (1.30%)     16.81%
Net assets (in millions):
   End of year                              $ 119.54    $ 108.93    $ 110.18    $ 126.63    $ 126.52
Ratio of operating expenses
   to average net assets                       1.46%       1.41%       1.33%       1.36%       1.17%
Ratio of interest expense
   to average net assets                       0.61%       0.63%       0.58%       0.56%       0.57%
Ratio of income tax expense
   to average net assets (d)                   0.46%       0.00%       0.00%       0.48%       2.68%
Ratio of total expenses before custodian fee
   reduction to average net assets (d)         2.53%       2.04%       1.91%       2.40%       4.46%
Ratio of net expenses after custodian fee
   reduction to average net assets (d)         2.53%       2.04%       1.91%       2.40%       4.42%
Ratio of net investment income
   to average net assets                       8.96%       8.55%       8.74%       9.32%       8.43%
Portfolio turnover                               27%         23%         32%         33%         34%

(a) Calculated using average shares.
(b) Rounds to less than $0.01 per share.
(c) Net asset value return represents portfolio returns based on change in the Trust's net asset value assuming the reinvestment of
    all dividends and distributions which differs from the total investment return based on the Trust's market value due to the
    difference between the Trust's net asset value and the market value of its shares outstanding; past performance is no guarantee
    of future results.
(d) As additional information, this ratio is included to reflect the taxes paid on retained long-term gains. These taxes paid are
    netted against realized capital gains in the Statement of Operations. The taxes paid are treated as deemed distributions and a
    credit for the taxes paid is passed on to shareholders.

Senior borrowings:
Total principal amount (in millions)        $     12    $     12    $     12    $     12    $     12
Asset coverage per $1,000
  of indebtedness                           $ 10,962    $ 10,077    $ 10,181    $ 11,552    $ 11,543


See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
12           MassMutual Participation Investors 2010 ANNUAL REPORT


CONSOLIDATED SCHEDULE OF INVESTMENTS
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES - 90.91%:(A)                               PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
PRIVATE PLACEMENT INVESTMENTS - 89.93%
                                                                                                        
A E Company, Inc.
A designer and manufacturer of machined parts and assembly structures for the commercial and military aerospace industries.
11% Senior Secured Note due 2015                                         $     807,692          *   $     791,538   $     822,747
13% Senior Subordinated Note due 2016                                    $     807,693   11/10/09         732,156         827,843
Common Stock (B)                                                          184,615 shs.   11/10/09         184,615         132,369
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                       92,308 shs.   11/10/09          68,566          66,185
                                                                                                    -------------   -------------
* 11/10/09 and 11/18/09.                                                                                1,776,875       1,849,144
                                                                                                    -------------   -------------
A H C Holding Company, Inc.
A designer and manufacturer of boilers and water heaters for the commercial sector.
15% Senior Subordinated Note due 2015                                    $   1,352,743   11/21/07       1,332,006       1,352,743
Limited Partnership Interest (B)                                           12.26% int.   11/21/07         119,009         207,940
                                                                                                    -------------   -------------
                                                                                                        1,451,015       1,560,683
                                                                                                    -------------   -------------
A S A P Industries LLC
A designer and manufacturer of components used on oil and natural gas wells.
12.5% Senior Subordinated Note due 2015                                  $     450,500   12/31/08         402,371         455,005
Limited Liability Company Unit Class A-2 (B)                                  677 uts.   12/31/08          74,333         181,095
Limited Liability Company Unit Class A-3 (B)                                  608 uts.   12/31/08          66,899         162,987
                                                                                                    -------------   -------------
                                                                                                          543,603         799,087
                                                                                                    -------------   -------------
A S C Group, Inc.
A designer and manufacturer of high reliability encryption equipment, communications products, computing systems and electronic
components primarily for the military and aerospace sectors.
12.75% Senior Subordinated Note due 2016                                 $   1,227,273   10/09/09       1,070,102       1,251,818
Limited Liability Company Unit Class A (B)                                  2,186 uts.          *         214,793         130,406
Limited Liability Company Unit Class B (B)                                  1,473 uts.   10/09/09         144,716          87,872
                                                                                                    -------------   -------------
* 10/09/09 and 10/27/10.                                                                                1,429,611       1,470,096
                                                                                                    -------------   -------------
A W X Holdings Corporation
A provider of aerial equipment rental, sales and repair services to non-residential construction and maintenance contractors
operating in the State of Indiana.
10.5% Senior Secured Term Note due 2014 (D)                              $     420,000   05/15/08         411,600         315,000
13% Senior Subordinated Note due 2015 (D)                                $     420,000   05/15/08         375,946            --
Common Stock (B)                                                           60,000 shs.   05/15/08          60,000            --
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                       21,099 shs.   05/15/08          35,654            --
                                                                                                    -------------   -------------
                                                                                                          883,200         315,000
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    13


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Advanced Technologies Holdings
A provider of factory maintenance services to industrial companies.
15% Senior Subordinated Note due 2013                                    $   1,181,702   12/27/07   $   1,167,860   $   1,181,702
Preferred Stock (B)                                                           546 shs.   12/27/07         270,000         325,692
                                                                                                    -------------   -------------
                                                                                                        1,437,860       1,507,394
                                                                                                    -------------   -------------
Aero Holdings, Inc.
A provider of geospatial services to corporate and government clients.
10.5% Senior Secured Term Note due 2014                                  $     810,000   03/09/07         797,850         812,211
14% Senior Subordinated Note due 2015                                    $     720,000   03/09/07         670,259         720,000
Common Stock (B)                                                          150,000 shs.   03/09/07         150,000         149,018
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                       37,780 shs.   03/09/07          63,730          37,533
                                                                                                    -------------   -------------
                                                                                                        1,681,839       1,718,762
                                                                                                    -------------   -------------
All Current Holding Company
A specialty re-seller of essential electrical parts and components primarily serving wholesale distributors.
12% Senior Subordinated Note due 2015                                    $     603,697   09/26/08         558,924         609,734
Common Stock (B)                                                              713 shs.   09/26/08          71,303          60,120
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          507 shs.   09/26/08          46,584          42,750
                                                                                                    -------------   -------------
                                                                                                          676,811         712,604
                                                                                                    -------------   -------------
American Hospice Management Holding LLC
A for-profit hospice care provider in the United States.
12% Senior Subordinated Note due 2013                                    $   1,687,503          *       1,635,432       1,687,503
Preferred Class A Unit (B)                                                  1,706 uts.         **         170,600         292,017
Preferred Class B Unit (B)                                                    808 uts.   06/09/08          80,789         120,658
Common Class B Unit (B)                                                    16,100 uts.   01/22/04               1          77,136
Common Class D Unit (B)                                                     3,690 uts.   09/12/06            --            17,679
                                                                                                    -------------   -------------
* 01/22/04 and 06/09/08. ** 01/22/04 and 09/12/06.                                                      1,886,822       2,194,993
                                                                                                    -------------   -------------
Apex Analytix Holding Corporation
A provider of audit recovery and fraud detection services and software to commercial and retail businesses in the U.S. and Europe.
12.5% Senior Subordinated Note due 2014                                  $   1,012,500   04/28/09         872,406       1,032,750
Preferred Stock Series B (B)                                                1.623 shs.   04/28/09         162,269         241,496
Common Stock (B)                                                              723 shs.   04/28/09             723         107,632
                                                                                                    -------------   -------------
                                                                                                        1,035,398       1,381,878
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
14                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Arrow Tru-Line Holdings, Inc.
A manufacturer of hardware for residential and commercial overhead garage doors in North America.
12% Senior Subordinated Note due 2012                                    $     984,209   05/18/05   $     910,555   $     787,367
Preferred Stock (B)                                                            33 shs.   10/16/09          33,224            --
Common Stock (B)                                                              263 shs.   05/18/05         263,298            --
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                           69 shs.   05/18/05          59,362            --
                                                                                                    -------------   -------------
                                                                                                        1,266,439         787,367
                                                                                                    -------------   -------------
Associated Diversified Services
A provider of routine maintenance and repair services primarily to electric utility companies predominantly on electric power
distribution lines.
10% Senior Secured Term Note due 2016 (C)                                $     332,000   09/30/10         323,700         327,794
13% Senior Subordinated Note due 2017                                    $     332,000   09/30/10         296,350         323,944
Limited Liability Company Unit Class B (B)                                 36,000 uts.   09/30/10          36,000          34,200
Limited Liability Company Unit Class B OID (B)                             27,520 uts.   09/30/10          27,520             275
                                                                                                    -------------   -------------
                                                                                                          683,570         686,213
                                                                                                    -------------   -------------
Barcodes Group, Inc.
A distributor and reseller of automatic identification and data capture equipment, including mobile computers, scanners,
point-of-sale systems, labels, and accessories.
13.5% Senior Subordinated Note due 2016                                  $     640,283   07/27/10         608,920         647,202
Preferred Stock (B)                                                            13 shs.   07/27/10         131,496         124,925
Common Stock Class A (B)                                                       44 shs.   07/27/10             437             415
Warrant, exercisable until 2020, to purchase
  common stock at $.01 per share (B)                                            8 shs.   07/27/10              76            --
                                                                                                    -------------   -------------
                                                                                                          740,929         772,542
                                                                                                    -------------   -------------
Bravo Sports Holding Corporation
A designer and marketer of niche branded consumer products including canopies, trampolines, in-line skates, skateboards, and
urethane wheels.
12.5% Senior Subordinated Note due 2014                                  $   1,207,902   06/30/06       1,166,361       1,207,902
Preferred Stock Class A (B)                                                   465 shs.   06/30/06         141,946         100,044
Common Stock (B)                                                                 1 sh.   06/30/06             152            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                          164 shs.   06/30/06          48,760          35,160
                                                                                                    -------------   -------------
                                                                                                        1,357,219       1,343,106
                                                                                                    -------------   -------------
C D N T, Inc.
A value-added converter and distributor of specialty pressure sensitive adhesives, foams, films, and foils.
10.5% Senior Secured Term Note due 2014                                  $     375,436   08/07/08         371,022         368,296
12.5% Senior Subordinated Note due 2015                                  $     429,070   08/07/08         396,840         412,473
Common Stock (B)                                                           41,860 shs.   08/07/08          41,860          31,006
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                       32,914 shs.   08/07/08          32,965          24,380
                                                                                                    -------------   -------------
                                                                                                          842,687         836,155
                                                                                                    -------------   -------------


---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    15


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Capital Specialty Plastics, Inc.
A producer of desiccant strips used for packaging pharmaceutical products.
Common Stock (B)                                                               55 shs.          *   $         252   $    578,555
* 12/30/97 and 05/29/99.                                                                            -------------   -------------

Clough, Harbour and Associates
An engineering service firm that is located in Albany, NY.
12.25% Senior Subordinated Note due 2015                                 $   1,270,588   12/02/08       1,197,006      1,283,294
Preferred Stock (B)                                                           147 shs.   12/02/08         146,594        138,206
                                                                                                    -------------   -------------
                                                                                                        1,343,600      1,421,500
                                                                                                    -------------   -------------
Coeur, Inc.
A producer of proprietary, disposable power injection syringes.
12% Senior Subordinated Note due 2016                                    $     642,857   10/10/08         592,556        649,286
Common Stock (B)                                                              321 shs.   10/10/08          32,143         20,538
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          495 shs.   10/10/08          48,214         31,597
                                                                                                    -------------   -------------
                                                                                                          672,913        701,421
                                                                                                    -------------   -------------
Connecticut Electric, Inc.
A supplier and distributor of electrical products sold into the retail and wholesale markets.
10% Senior Subordinated Note due 2014 (D)                                $     771,051   01/12/07         719,275        385,526
Limited Liability Company Unit Class A (B)                                 82,613 uts.   01/12/07          82,613           --
Limited Liability Company Unit Class C (B)                                 59,756 uts.   01/12/07          59,756           --
Limited Liability Company Unit Class D (B)                                671,525 uts.   05/03/10            --             --
Limited Liability Company Unit Class E (B)                                  1,102 uts.   05/03/10            --             --
                                                                                                    -------------   -------------
                                                                                                          861,644        385,526
                                                                                                    -------------   -------------
Connor Sport Court International, Inc.
A designer and manufacturer of outdoor and indoor synthetic sports flooring and other temporary flooring products.
Preferred Stock Series B-2 (B)                                              9,081 shs.   07/05/07         370,796        908,072
Preferred Stock Series C (B)                                                4,757 shs.   07/05/07         158,912        475,708
Common Stock (B)                                                              380 shs.   07/05/07               4            444
Limited Partnership Interest (B)                                            6.88% int.          *         103,135           --
                                                                                                    -------------   -------------
*08/12/04 and 01/14/05.                                                                                   632,847      1,384,224
                                                                                                    -------------   -------------
CorePharma LLC
A manufacturer of oral dose generic pharmaceuticals targeted at niche applications.
14.5% Senior Subordinated Note due 2016                                  $   1,350,000   08/04/05       1,350,000      1,350,000
Warrant, exercisable until 2013, to purchase
  common stock at $.001 per share (B)                                          10 shs.   08/04/05          72,617        135,362
                                                                                                    -------------   -------------
                                                                                                        1,422,617      1,485,362
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
16                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Crane Rental Corporation
A crane rental company.
13% Senior Subordinated Note due 2015                                    $   1,215,000   08/21/08   $   1,120,336   $   1,190,998
Common Stock (B)                                                          135,000 shs.   08/21/08         135,000            --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                       72,037 shs.   08/21/08         103,143            --
                                                                                                    -------------   -------------
                                                                                                        1,358,479       1,190,998
                                                                                                    -------------   -------------
Custom Engineered Wheels, Inc.
A manufacturer of custom engineered, non-pneumatic plastic wheels and plastic tread cap tires used primarily for lawn and garden
products and wheelchairs.
12.5% Senior Subordinated Note due 2016                                  $   1,155,288   10/27/09       1,017,466       1,181,899
Preferred Stock PIK (B)                                                       156 shs.   10/27/09         156,468         157,997
Preferred Stock Series A (B)                                                  114 shs.   10/27/09         104,374         115,436
Common Stock (B)                                                               38 shs.   10/27/09          38,244          17,035
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                           28 shs.   10/27/09          25,735          12,447
                                                                                                    -------------   -------------
                                                                                                        1,342,287       1,484,814
                                                                                                    -------------   -------------
Davis-Standard LLC
A manufacturer, assembler, and installer of a broad range of capital equipment that is used in the extrusion, conversion, and
processing of plastic materials.
12% Senior Subordinated Note due 2014                                    $     978,261   10/30/06         939,369         977,967
Limited Partnership Interest (B)                                            0.97% int.   10/30/06         371,739         270,666
Warrant, exercisable until 2014, to purchase
  preferred stock at $.01 per share (B)                                        26 shs.   10/30/06          26,380          34,003
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           18 shs.   10/30/06          18,000            --
                                                                                                    -------------   -------------
                                                                                                        1,355,488       1,282,636
                                                                                                    -------------   -------------
Duncan Systems, Inc.
A distributor of windshields and side glass for the recreational vehicle market.
10% Senior Secured Term Note due 2013                                    $     231,429   11/01/06         227,957         236,311
13% Senior Subordinated Note due 2014                                    $     488,572   11/01/06         452,478         488,572
Common Stock (B)                                                          102,857 shs.   11/01/06         102,857          82,184
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                       32,294 shs.   11/01/06          44,663          25,803
                                                                                                    -------------   -------------
                                                                                                          827,955         832,870
                                                                                                    -------------   -------------
E S P Holdco, Inc.
A manufacturer of power protection technology for commercial office equipment, primarily supplying the office equipment dealer
network.
14% Senior Subordinated Note due 2015                                    $   1,247,375   01/08/08       1,223,876       1,221,027
Common Stock (B)                                                              349 shs.   01/08/08         174,701          53,129
                                                                                                    -------------   -------------
                                                                                                        1,398,577       1,274,156
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    17


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
E X C Acquisition Corporation
A manufacturer of pre-filled syringes and pump systems used for intravenous drug delivery.
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           11 shs.   06/28/04   $      40,875   $      41,372
                                                                                                    -------------   -------------
Eatem Holding Company
A developer and manufacturer of savory flavor systems for soups, sauces, gravies, and other products produced by food manufacturers
for retail and foodservice end products.
12.5% Senior Subordinated Note due 2018                                  $     950,000   02/01/10         832,027         938,705
Common Stock (B)                                                               50 shs.   02/01/10          50,000          47,500
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          119 shs.   02/01/10         107,100               1
                                                                                                    -------------   -------------
                                                                                                          989,127         986,206
                                                                                                    -------------   -------------
F C X Holdings Corporation
A distributor of specialty/technical valves, actuators, accessories, and process instrumentation supplying a number of industrial,
high purity, and energy end markets in North America.
15% Senior Subordinated Note due 2015                                    $   1,195,885   10/06/08       1,177,771       1,219,803
Preferred Stock Series B (B)                                                2,420 shs.   10/06/08         229,804         125,450
Preferred Stock Series A (B)                                                  122 shs.   12/30/10          12,200          11,590
Common Stock (B)                                                            1,625 shs.   10/06/08           1,625            --
                                                                                                    -------------   -------------
                                                                                                        1,421,400       1,356,843
                                                                                                    -------------   -------------
F F C Holding Corporation
A leading U.S. manufacturer of private label frozen novelty and ice cream products.
16% Senior Subordinated Note due 2017                                    $     836,847   09/27/10         820,153         824,811
Limited Liability Company Units Preferred (B)                                 171 uts.   09/27/10         153,659         145,974
Limited Liability Company Units (B)                                           171 uts.   09/27/10          17,073          16,219
                                                                                                    -------------   -------------
                                                                                                          990,885         987,004
                                                                                                    -------------   -------------
F G I Equity LLC
A manufacturer of a broad range of filters and related products that are used in commercial, light industrial, healthcare, gas
turbine, nuclear, laboratory, clean room, hotel, educational system, and food processing settings.
14.25% Senior Subordinated Note due 2016                                 $     434,211   12/15/10         421,624         435,240
Limited Liability Company Unit Class B-1 (B)                               65,789 uts.   12/15/10          65,789          62,500
Limited Liability Company Unit Class B-2 (B)                                8,248 uts.   12/15/10           8,248              82
                                                                                                    -------------   -------------
                                                                                                          495,661         497,822
                                                                                                    -------------   -------------
F H Equity LLC
A designer and manufacturer of a full line of automatic transmission filters and filtration systems for passenger vehicles.
14% Senior Subordinated Note due 2017                                    $     500,000   12/20/10         478,995         501,314
Limited Liability Company Unit Class C (B)                                  1,575 uts.   12/20/10          16,009              16
                                                                                                    -------------   -------------
                                                                                                          495,004         501,330
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
18                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Flutes, Inc.
An independent manufacturer of micro fluted corrugated sheet material for the food and consumer products packaging industries.
10% Senior Secured Term Note due 2013 (D)                                $     524,791   04/13/06   $     516,919   $     393,593
14% Senior Subordinated Note due 2014 (D)                                $     317,177   04/13/06         283,220            --
                                                                                                    -------------   -------------
                                                                                                          800,139         393,593
                                                                                                    -------------   -------------
G C Holdings
A leading manufacturer of gaming tickets, industrial recording charts, security-enabled point-of sale receipts, and medical charts
and supplies.
12.5% Senior Subordinated Note due 2017                                  $   1,000,000   10/19/10         933,605         985,317
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          198 shs.   10/19/10          46,958               2
                                                                                                    -------------   -------------
                                                                                                          980,563         985,319
                                                                                                    -------------   -------------
Golden County Foods Holding, Inc.
A manufacturer of frozen appetizers and snacks.
16% Senior Subordinated Note due 2015                                    $   1,012,500   11/01/07         941,120         405,000
16% PIK Note due 2015                                                    $     270,394   12/31/08         219,292         108,158
8% Series A Convertible Preferred Stock, convertible into
  fully diluted common shares (B)                                          77,643 shs.   11/01/07          77,643            --
                                                                                                    -------------   -------------
                                                                                                        1,238,055         513,158
                                                                                                    -------------   -------------
H M Holding Company
A designer, manufacturer, and importer of promotional and wood furniture.
7.5% Senior Subordinated Note due 2013 (D)                               $     362,700   10/15/09         271,181         272,025
Preferred Stock (B)                                                            21 shs.          *          21,428            --
Preferred Stock Series B (B)                                                1,088 shs.   10/15/09         813,544            --
Common Stock (B)                                                              180 shs.   02/10/06         180,000            --
Common Stock Class C (B)                                                      296 shs.   10/15/09            --              --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                           67 shs.   02/10/06          61,875            --
                                                                                                    -------------   -------------
* 09/18/07 and 06/27/08.                                                                                1,348,028         272,025
                                                                                                    -------------   -------------
Highgate Capital LLC
An acquirer of controlling or substantial interests in manufacturing and marketing entities.
Series A Preferred Units (B)                                                0.30% int.   07/21/94          91,867            --
                                                                                                    -------------   -------------
Home Decor Holding Company
A designer, manufacturer and marketer of framed art and wall decor products.
12.5% Senior Subordinated Note due 2013                                  $   1,081,731          *       1,022,796       1,081,731
Common Stock (B)                                                               33 shs.          *          33,216          49,779
Warrant, exercisable until 2012, to purchase
  common stock at $.02 per share (B)                                          106 shs.          *         105,618         158,267
                                                                                                    -------------   -------------
* 06/30/04 and 08/19/04.                                                                                1,161,630       1,289,777
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    19


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Hospitality Mints Holding Company
A manufacturer of individually-wrapped imprinted promotional mints.
12% Senior Subordinated Note due 2016                                    $   1,308,732   08/19/08   $   1,234,273   $   1,279,240
Common Stock (B)                                                              251 shs.   08/19/08         251,163          63,788
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                           65 shs.   08/19/08          60,233          16,488
                                                                                                    -------------   -------------
                                                                                                        1,545,669       1,359,516
                                                                                                    -------------   -------------
Insurance Claims Management, Inc.
A third party administrator providing auto and property claim administration services for insurance companies.
Common Stock (B)                                                               37 shs.   02/27/07           1,100         158,461
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                           11 shs.   02/27/07             324          46,680
                                                                                                    -------------   -------------
                                                                                                            1,424         205,141
                                                                                                    -------------   -------------
International Offshore Services LLC
A leading provider of marine transportation services, platform decomissioning, and salvage services to oil and gas producers in the
shallow waters of the Gulf of Mexico.
14.25% Senior Subordinated Secured Note due 2017                         $   1,350,000   07/07/09       1,231,129       1,342,174
Limited Liability Company Unit (B)                                          1,647 uts.   07/07/09          98,833          21,662
                                                                                                    -------------   -------------
                                                                                                        1,329,962       1,363,836
                                                                                                    -------------   -------------
J A C Holding Enterprises, Inc.
A supplier of luggage racks and accessories to the original equipment manufacturers.
12.5% Senior Subordinated Note due 2017                                  $     833,333   12/20/10         711,049         829,919
Preferred Stock A (B)                                                         165 shs.   12/20/10         165,000         156,750
Preferred Stock B (B)                                                         0.05 sh.   12/20/10            --              --
Common Stock (B)                                                               33 shs.   12/20/10           1,667           1,583
Warrant, exercisable until 2020, to purchase
  common stock at $.01 per share (B)                                           12 shs.   12/20/10         105,643            --
                                                                                                    -------------   -------------
                                                                                                          983,359         988,252
                                                                                                    -------------   -------------
Jason Partners Holdings LLC
A diversified manufacturing company serving various industrial markets.
Limited Liability Company Unit (B)                                             48 uts.   09/21/10         449,086          25,511
                                                                                                    -------------   -------------
Justrite Manufacturing Acquisition Co.
A manufacturer of safety products such as storage cabinets and containers.
12% Senior Subordinated Note due 2011                                    $     843,750   12/15/04         830,514         843,750
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                          594 shs.   12/15/04          53,528         114,227
                                                                                                    -------------   -------------
                                                                                                          884,042         957,977
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
20                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
K H O F Holdings, Inc.
A manufacturer of premium disposable tableware products serving both the food service and consumer channels.
Common Stock (B)                                                          116,827 shs.   10/15/07   $      71,515   $     116,337
                                                                                                    -------------   -------------
K N B Holdings Corporation
A designer, manufacturer and marketer of products for the custom framing market.
15.5% Senior Subordinated Note due 2013 (D)                              $   1,595,057   05/25/06       1,398,385       1,572,646
Common Stock (B)                                                           71,053 shs.   05/25/06          71,053            --
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                       43,600 shs.   05/25/06          37,871            --
                                                                                                    -------------   -------------
                                                                                                        1,507,309       1,572,646
                                                                                                    -------------   -------------
K P H I Holdings, Inc.
A manufacturer of highly engineered plastic and metal components for a diverse range of end-markets, including medical, consumer
and industrial, automotive and defense.
15% Senior Subordinated Note due 2017                                    $     869,565   12/10/10         852,174         855,045
Common Stock (B)                                                          130,435 shs.   12/10/10         130,435         123,913
                                                                                                    -------------   -------------
                                                                                                          982,609         978,958
                                                                                                    -------------   -------------
K P I Holdings, Inc.
The largest player in the U.S. non-automotive, non-ferrous die casting segment.
18% Senior Subordinated Note due 2014 (D)                                $   1,194,719   07/16/08       1,106,110       1,181,034
Convertible Preferred Stock Series C (B)                                       29 shs.   06/30/09          29,348          27,550
Convertible Preferred Stock Series D (B)                                       13 shs.   09/17/09          12,958          12,312
Common Stock (B)                                                              235 shs.   07/15/08         234,783              33
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          388 shs.          *          50,836              54
                                                                                                    -------------   -------------
* 07/16/08 and 09/17/09.                                                                                1,434,035       1,220,983
                                                                                                    -------------   -------------
K W P I Holdings Corporation
A manufacturer and distributor of vinyl windows and patio doors throughout the northwestern United States.
18% Senior Subordinated Note due 2014 (D)                                $   1,555,404   03/14/07       1,419,469       1,244,323
Common Stock (B)                                                              123 shs.   03/13/07         123,000            --
Warrant, exercisable until 2019, to purchase
  preferred stock at $.01 per share (B)                                        71 shs.   07/07/09            --              --
Warrant, exercisable until 2017, to purchase
  common stock at $.01 per share (B)                                           89 shs.   03/14/07          85,890            --
                                                                                                    -------------   -------------
                                                                                                        1,628,359       1,244,323
                                                                                                    -------------   -------------
L H D Europe Holdings, Inc.
A non-carbonated beverage dispensing company focused on the food service industry.
Common Stock (B)                                                               45 shs.   12/28/09           4,191          12,825
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    21


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
M V I Holding, Inc.
A manufacturer of large precision machined metal components used in equipment which services a variety of industries, including
the oil and gas, mining, and defense markets.
13% Senior Subordinated Note due 2016                                    $     657,795   09/12/08   $     618,469   $     605,284
Common Stock (B)                                                               32 shs.   09/12/08          32,143            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                           35 shs.   09/12/08          34,714            --
                                                                                                    -------------   -------------
                                                                                                          685,326         605,284
                                                                                                    -------------   -------------
Mail Communications Group, Inc.
A provider of mail processing and handling services, lettershop services, and commercial printing services.
12.5% Senior Subordinated Note due 2014                                  $     516,177   05/04/07         496,417         516,177
Limited Liability Company Unit (B)                                         12,763 uts.          *         166,481         181,624
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                        1,787 shs.   05/04/07          22,781          25,429
                                                                                                    -------------   -------------
* 05/04/07 and 01/02/08.                                                                                  685,679         723,230
                                                                                                    -------------   -------------
Manhattan Beachwear Holding Company
A designer and distributor of women's swimwear.
15% Senior Subordinated Note due 2018                                    $     214,600   10/05/10         210,308         216,162
12.5% Senior Subordinated Note due 2018                                  $     882,353   01/15/10         776,957         900,000
Common Stock (B)                                                               35 shs.   10/05/10          34,400          33,630
Common Stock Class B (B)                                                      118 shs.   01/15/10         117,647         111,768
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                          104 shs.   01/15/10          94,579               1
                                                                                                    -------------   -------------
                                                                                                        1,234,891       1,261,561
                                                                                                    -------------   -------------
MBWS Ultimate Holdco, Inc.
A provider of services throughout North Dakota that address the fluid management and related transportation needs of an oil well.
12% Senior Subordinated Note due 2016                                    $     883,721   09/07/10         792,817         886,582
Preferred Stock Series A (B)                                                1,388 shs.   09/07/10         138,797         131,860
Common Stock (B)                                                              153 shs.   09/07/10          15,282          14,535
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                          386 shs.   09/07/10          38,623               4
                                                                                                    -------------   -------------
                                                                                                          985,519       1,032,981
                                                                                                    -------------   -------------
MedSystems Holdings LLC
A manufacturer of enteral feeding products, such as feeding tubes and other products related to assisted feeding.
13% Senior Subordinated Note due 2015                                    $     622,228   08/29/08         545,769         628,450
Preferred Unit (B)                                                             66 uts.   08/29/08          66,451          71,862
Common Unit Class A (B)                                                       671 uts.   08/29/08             671            --
Common Unit Class B (B)                                                       250 uts.   08/29/08          63,564            --
                                                                                                    -------------   -------------
                                                                                                          676,455         700,312
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
22                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
MEGTEC Holdings, Inc.
A supplier of industrial and environmental products and services to a broad array of industries.
12% Senior Subordinated Note due 2016                                    $   1,144,068   09/24/08   $   1,066,295   $   1,138,510
Preferred Stock (B)                                                            56 shs.   09/24/08          54,040          13,589
Limited Partnership Interest (B)                                            0.74% int.   09/16/08         205,932            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                           18 shs.   09/24/08          18,237            --
                                                                                                    -------------   -------------
                                                                                                        1,344,504       1,152,099
                                                                                                    -------------   -------------
MicroGroup, Inc.
A manufacturer of precision parts and assemblies, and a value-added supplier of metal tubing and bars.
12% Senior Subordinated Note due 2013 (D)                                $   1,421,795          *       1,376,662       1,208,526
Common Stock (B)                                                              238 shs.          *         238,000            --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                           87 shs.          *          86,281            --
                                                                                                    -------------   -------------
* 08/12/05 and 09/11/06.                                                                                1,700,943       1,208,526
                                                                                                    -------------   -------------
Milwaukee Gear Company
A manufacturer of high-precision custom gears and gear drives used by original equipment manufacturers operating in a number of
industries.
13% Senior Subordinated Note due 2014                                    $   1,246,154   07/21/08       1,193,749       1,183,846
Preferred Stock (B)                                                           139 shs.   07/21/08         138,374          28,820
Common Stock (B)                                                                9 shs.   07/21/08          10,000            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                            6 shs.   07/21/08           5,510            --
                                                                                                    -------------   -------------
                                                                                                        1,347,633       1,212,666
                                                                                                    -------------   -------------
Momentum Holding Co.
A designer and supplier of upholstery fabric to commercial furniture manufacturers and architectural and design firms.
Limited Partnership Interest (B)                                           11.24% int.   08/04/06          56,198         159,757
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                          586 shs.   08/04/06          56,705         166,528
                                                                                                    -------------   -------------
                                                                                                          112,903         326,285
                                                                                                    -------------   -------------
Monessen Holding Corporation
A designer and manufacturer of a broad line of gas, wood, and electric hearth products and accessories.
14% Senior Subordinated Note due 2014 (D)                                $   1,350,000   07/25/08       1,281,549         675,000
14% PIK Note due 2014 (D)                                                $     419,713   07/25/08         342,435         209,856
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                           81 shs.   03/31/06          73,125            --
                                                                                                    -------------   -------------
                                                                                                        1,697,109         884,856
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    23


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Motion Controls Holdings
A manufacturer of high performance mechanical motion control and linkage products.
14.25% Senior Subordinated Note due 2017                                 $     910,303   11/30/10   $     892,706   $     902,839
Limited Liability Company Unit Class B-1 (B)                               93,750 uts.   11/30/10          93,750          89,063
Limited Liability Company Unit Class B-2 (B)                                8,501 uts.   11/30/10           8,501              85
                                                                                                    -------------   -------------
                                                                                                          994,957         991,987
                                                                                                    -------------   -------------
NABCO, Inc.
A producer of explosive containment vessels in the United States.
14% Senior Subordinated Note due 2014 (D)                                $     330,882   02/24/06         304,577            --
Limited Liability Company Unit (B)                                            437 uts.          *         436,984            --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                           68 shs.   02/24/06          19,687            --
                                                                                                    -------------   -------------
* 02/24/06 and 06/22/07.                                                                                  761,248            --
                                                                                                    -------------   -------------
Navis Global
A designer, manufacturer, seller and servicer of finishing machinery for the knit and woven segments of the global textile industry.
10.75% Senior Secured Note due 2011 (D)                                  $     397,479   05/28/04         393,979         395,728
14% Senior Subordinated Note due 2014 (D)                                $     764,921   05/28/04         660,453          76,492
                                                                                                    -------------   -------------
                                                                                                        1,054,432         472,220
                                                                                                    -------------   -------------
Nesco Holdings Corporation
A sales and leasing company that provides equipment to the electric utility, telecommunications, and various other industries.
12% Senior Secured Subordinated Note due 2015                            $   1,125,000   08/02/07       1,036,767       1,125,000
Common Stock (B)                                                          225,000 shs.   08/02/07         225,000         443,606
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                       63,191 shs.   08/02/07         102,842         124,586
                                                                                                    -------------   -------------
                                                                                                        1,364,609       1,693,192
                                                                                                    -------------   -------------
NetShape Technologies, Inc.
A manufacturer of powder metal and metal injection molded precision components used in industrial, consumer, and other applications.
12% Senior Subordinated Note due 2014                                    $     867,692   02/02/07         780,230         433,846
Limited Partnership Interest of
Saw Mill PCG Partners LLC (B)                                               1.38% int.   02/01/07         539,990            --
Limited Liability Company Unit Class D of
  Saw Mill PCG Partners LLC (B)                                                 8 uts.          *           8,147            --
Limited Liability Company Unit Class D-1 of
  Saw Mill PCG Partners LLC (B)                                               111 uts.   09/30/09         111,486            --
Preferred Stock Class A (B)                                                      1 sh.   12/18/08             726            --
Preferred Stock Class A-1 (B)                                                  10 shs.   09/30/09           9,674            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           48 shs.   02/02/07          48,087            --
                                                                                                    -------------   -------------
* 12/18/08 and 09/30/09.                                                                                1,498,340         433,846
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
24                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Nicoat Acquisitions LLC
A manufacturer of water-based and ultraviolet coatings for high-performance graphic arts, packaging and other specialty coating
applications.
12.5% Senior Subordinated Note due 2016                                  $     482,759   11/05/10   $     436,244   $     476,909
Limited Liability Company Unit Series B (B)                                17,241 uts.   11/05/10          17,241          16,379
Limited Liability Company Unit Series B - OID (B)                          34,931 uts.   11/05/10          34,931             349
Limited Liability Company Unit Series F (B)                                52,172 uts.   11/05/10            --               522
                                                                                                    -------------   -------------
                                                                                                          488,416         494,159
                                                                                                    -------------   -------------
Northwest Mailing Services, Inc.
A producer of promotional materials for companies that use direct mail as part of their customer retention and loyalty programs.
12% Senior Subordinated Note due 2016                                    $   1,492,105          *       1,231,820       1,498,595
Limited Partnership Interest (B)                                           1,7240 uts.          *         174,006          96,364
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                        2,605 shs.          *         260,479         144,253
                                                                                                    -------------   -------------
* 07/09/09 and 08/09/10.                                                                                1,666,305       1,739,212
                                                                                                    -------------   -------------
Nyloncraft, Inc.
A supplier of engineered plastic components for the automotive industry.
10% Senior Secured Note due 2012                                         $     464,286   01/28/02         464,286         459,213
15% Senior Subordinated Note due 2012 (D)                                $     285,714   01/28/02         270,653         284,758
Convertible Preferred Stock A (B)                                             571 shs.   01/28/02         549,507         662,919
Common Stock (B)                                                          178,571 shs.   01/28/02         178,571         126,030
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                      138,928 shs.   01/28/02          92,597          98,052
                                                                                                    -------------   -------------
                                                                                                        1,555,614       1,630,972
                                                                                                    -------------   -------------
O E C Holding Corporation
A provider of elevator maintenance, repair and modernization services.
13% Senior Subordinated Note due 2017                                    $     444,445   06/04/10         406,118         447,516
Preferred Stock Series A (B)                                                  554 shs.   06/04/10          55,354          52,586
Preferred Stock Series B (B)                                                  311 shs.   06/04/10          31,125               3
Common Stock (B)                                                              344 shs.   06/04/10             344             327
                                                                                                    -------------   -------------
                                                                                                          492,941         500,432
                                                                                                    -------------   -------------
OakRiver Technology, Inc.
Designs, engineers and assembles high precision automated process equipment for the medical device industry with a focus on
defibrilators and stents.
Common Stock (B)                                                          184,176 shs.   01/03/06         184,176        281,895
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                       43,073 shs.   01/03/06          35,900         65,926
                                                                                                    -------------   -------------
                                                                                                          220,076        347,821
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    25


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Ontario Drive & Gear Ltd.
A manufacturer of all-wheel drive, off-road amphibious vehicles and related accessories.
Limited Liability Company Unit (B)                                          1,942 uts.   01/17/06   $     302,885   $     570,181
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                          328 shs.   01/17/06          90,424          96,267
                                                                                                    -------------   -------------
                                                                                                          393,309         666,448
                                                                                                    -------------   -------------
P K C Holding Corporation
A manufactuer of plastic film and badges for the general industrial, medical, and food industries.
14% Senior Subordinated Note due 2016                                    $   1,552,500   12/21/10       1,509,936       1,547,588
Preferred Stock Class A (B)                                                    29 shs.   12/21/10         180,380         285,100
Common Stock (B)                                                               29 shs.   12/21/10          13,500            --
                                                                                                    -------------   -------------
                                                                                                        1,703,816       1,832,688
                                                                                                    -------------   -------------
P P T Holdings LLC
A high-end packaging solutions provider that targets customers who have multiple packaging needs, require a high number of low
volume SKUs, short lead times, technical expertise, and overall supply chain management.
15% Senior Subordinated Note due 2017                                    $     892,857   12/20/10         875,000         891,721
Limited Liability Company Unit Class A (B)                                     33 uts.   12/20/10         106,071         100,777
Limited Liability Company Unit Class B (B)                                     33 uts.   12/20/10           1,072           1,018
                                                                                                    -------------   -------------
                                                                                                          982,143         993,516
                                                                                                    -------------   -------------
Pacific Consolidated Holdings LLC
A manufacturer of rugged, mobile liquid and gaseous oxygen and nitrogen generating systems used in the global defense, oil and gas,
and medical sectors.
14% Senior Subordinated Note due 2012                                    $     716,295   04/27/07         693,145         578,721
5% Senior Subordinated Note due 2012                                     $      42,187   07/21/10          42,187          42,155
Preferred Shares Series E (B)                                              42,187 uts.   07/21/10            --              --
Limited Liability Company Unit (B)                                        928,962 uts.   04/27/07          33,477            --
                                                                                                    -------------   -------------
                                                                                                          768,809         620,876
                                                                                                    -------------   -------------
Paradigm Packaging, Inc.
A manufacturer of plastic bottles and closures for the nutritional, pharmaceutical, personal care, and food packaging markets.
12% Senior Subordinated Note due 2011                                    $   1,125,000   12/19/00       1,107,666       1,125,000
Warrant, exercisable until 2011, to purchase
  common stock at $.02 per share (B)                                          197 shs.   12/21/00         140,625         125,300
                                                                                                    -------------   -------------
                                                                                                        1,248,291       1,250,300
                                                                                                    -------------   -------------
Pearlman Enterprises, Inc.
A developer and distributor of tools, equipment and supplies to the natural and engineered stone industry.
Preferred Stock Series A (B)                                                1,236 shs.   05/22/09          59,034            --
Preferred Stock Series B (B)                                                7,059 shs.   05/22/09         290,050            --
Common Stock (B)                                                           21,462 shs.   05/22/09         993,816            --
                                                                                                    -------------   -------------
                                                                                                        1,342,900            --
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
26                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Postle Aluminum Company LLC
A manufacturer and distributor of aluminum extruded products.
15% Senior Subordinated Note due 2013                                    $     824,114   06/03/10   $     808,015   $     835,399
3% Senior Subordinated PIK Note due 2014 (D)                             $   1,209,017   10/02/06       1,066,355       1,185,025
Limited Liability Company Unit Class A (B)                                    733 uts.   10/02/06         270,000          66,276
Limited Liability Company Unit (B)                                             76 uts.   05/22/09             340           6,874
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                        4,550 shs.   10/02/06          65,988         411,578
                                                                                                    -------------   -------------
                                                                                                        2,210,698       2,505,152
                                                                                                    -------------   -------------
Power Services Holding Company
A provider of industrial motor repair services, predictive and preventative maintenance, and performance improvement consulting
serving the petrochemical, mining, power generation, metals, and paper industries.
12% Senior Subordinated Note due 2016                                    $   1,255,814   02/11/08       1,169,459       1,233,520
Limited Partnership Interest (B)                                           12.55% int.   02/11/08          94,092          11,637
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                          700 shs.   02/11/08          88,723          22,934
                                                                                                    -------------   -------------
                                                                                                        1,352,274       1,268,091
                                                                                                    -------------   -------------
Precision Wire Holding Company
A manufacturer of specialty medical wires that are used in non-elective minimally invasive surgical procedures.
14.25% Senior Subordinated Note due 2016                                 $   1,373,219   11/12/09       1,247,717       1,392,622
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                          109 shs.   11/12/09         107,970         101,604
                                                                                                    -------------   -------------
                                                                                                        1,355,687       1,494,226
                                                                                                    -------------   -------------
Qualis Automotive LLC
A distributor of aftermarket automotive brake and chassis products.
13% Senior Subordinated Note due 2013                                    $     450,000   05/28/04         424,152         450,000
Common Stock (B)                                                          187,500 shs.   05/28/04         187,500         157,253
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                      199,969 shs.   05/28/04         199,969         167,710
                                                                                                    -------------   -------------
                                                                                                          811,621         774,963
                                                                                                    -------------   -------------
R A J Manufacturing Holdings LLC
A designer and manufacturer of women's swimwear sold under a variety of licensed brand names.
14.5% Senior Subordinated Note due 2014                                  $   1,434,594   12/15/06       1,362,729       1,362,864
Limited Liability Company Unit (B)                                          1,497 uts.   12/15/06         149,723          40,715
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                            2 shs.   12/15/06          69,609          19,213
                                                                                                    -------------   -------------
                                                                                                        1,582,061       1,422,792
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    27


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
R E I Delaware Holding, Inc.
An engineer and manufacturer of highly complex, close tolerance components, assemblies, tooling and custom automation equipment
primarily for aerospace, medical and defense/radar markets.
12% Senior Subordinated Note due 2016                                    $   1,350,000   01/18/08   $   1,317,644   $   1,341,985
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                            3 shs.   01/18/08          16,459          13,262
                                                                                                    -------------   -------------
                                                                                                        1,334,103       1,355,247
                                                                                                    -------------   -------------
Royal Baths Manufacturing Company
A manufacturer and distributor of acrylic and cultured marble bathroom products.
12.5% Senior Subordinated Note due 2011                                  $     281,250   11/14/03         275,647         282,647
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                           74 shs.   11/14/03          65,089          65,215
                                                                                                    -------------   -------------
                                                                                                          340,736         347,862
                                                                                                    -------------   -------------
Safety Speed Cut Manufacturing Company, Inc.
A manufacturer of vertical panel saws and routers for the wood working industry.
Class B Common Stock (B)                                                      846 shs.   06/02/99         146,456         165,693
                                                                                                    -------------   -------------
Savage Sports Holding, Inc.
A manufacturer of sporting firearms.
12% Senior Subordinated Note due 2012                                    $     814,655   09/10/04         791,685         814,655
Preferred Stock Series A (B)                                                   35 shs.   05/28/10          35,038          33,288
Common Stock (B)                                                              324 shs.          *         340,378         568,368
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                           71 shs.   09/10/04          60,129         124,094
                                                                                                    -------------   -------------
* 09/10/04 and 10/05/07.                                                                                1,227,230       1,540,405
                                                                                                    -------------   -------------
Sencore Holding Company
A designer, manufacturer, and marketer of decoders, receivers and modulators sold to broadcasters, satellite, cable and telecom
operators for encoding/decoding analog and digital transmission video signals.
12.5% Senior Subordinated Note due 2014                                  $     934,615   01/15/09         840,243         794,423
Common Stock (B)                                                               69 shs.   01/15/09          69,231            --
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                          149 shs.   01/15/09         149,084            --
                                                                                                    -------------   -------------
                                                                                                        1,058,558         794,423
                                                                                                    -------------   -------------
Smart Source Holdings LLC
A short-term computer rental company.
12% Senior Subordinated Note due 2015                                    $   1,176,924          *       1,090,277       1,149,369
Limited Liability Company Unit (B)                                            328 uts.          *         334,371         236,226
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                           83 shs.          *          87,231          59,836
                                                                                                    -------------   -------------
* 08/31/07 and 03/06/08.                                                                                1,511,879       1,445,431
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
28                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Snacks Parent Corporation
The worlds largest provider of trail mixes and a leading provider of snack nuts, dried fruits, and other healthy snack products.
13% Senior Subordinated Note due 2017                                    $     869,603   11/12/10   $     818,326   $     863,054
Preferred Stock A (B)                                                       1,132 shs.   11/12/10         107,498         102,123
Preferred Stock B (B)                                                         525 shs.   11/12/10          49,884          47,389
Common Stock (B)                                                            6,579 shs.   11/12/10           6,579           6,250
Warrant, exercisable until 2020, to purchase
  common stock at $.01 per share (B)                                        1,806 shs.   11/12/10           1,806              18
                                                                                                    -------------   -------------
                                                                                                          984,093       1,018,834
                                                                                                    -------------   -------------
Spartan Foods Holding Company
A manufacturer of branded pizza crusts and pancakes.
12.25% Senior Subordinated Note due 2017                                 $   1,012,500   12/15/09         880,965         962,148
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          136 shs.   12/15/09         120,234          49,354
                                                                                                    -------------   -------------
                                                                                                        1,001,199       1,011,502
                                                                                                    -------------   -------------
Specialty Commodities, Inc.
A distributor of specialty food ingredients.
13.25% Senior Subordinated Note due 2016                                 $   1,224,124   10/23/08       1,160,298       1,236,366
Common Stock (B)                                                           15,882 shs.   10/23/08         158,824          90,260
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                        5,852 shs.   10/23/08          53,285          33,258
                                                                                                    -------------   -------------
                                                                                                        1,372,407       1,359,884
                                                                                                    -------------   -------------
Stanton Carpet Holding Co.
A designer and marketer of high and mid-priced decorative carpets and rugs.
12.13% Senior Subordinated Note due 2014                                 $   1,185,366   08/01/06       1,143,606       1,163,025
Common Stock (B)                                                              165 shs.   08/01/06         164,634         100,152
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                           55 shs.   08/01/06          49,390          33,356
                                                                                                    -------------   -------------
                                                                                                        1,357,630       1,296,533
                                                                                                    -------------   -------------
Sundance Investco LLC
A provider of post-production services to producers of movies and television shows.
Limited Liability Company Unit Class A (B)                                  3,405 uts.   03/31/10            --              --
                                                                                                    -------------   -------------
Sunrise Windows Holding Co.
A manufacturer and marketer of premium vinyl windows exclusively selling to the residential remodeling and replacement market.
14% Senior Subordinated Note due 2017                                    $     961,832   12/14/10         905,402         961,413
Common Stock (B)                                                               38 shs.   12/14/10          38,168          36,262
Warrant, exercisable until 2020, to purchase
  common stock at $.01 per share (B)                                           37 shs.   12/14/10          37,249            --
                                                                                                    -------------   -------------
                                                                                                          980,819         997,675
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    29


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Synteract Holdings Corporation
A provider of outsourced clinical trial management services to pharmaceutical and biotechnology companies.
14.5% Senior Subordinated Note due 2016                                  $   1,386,565   09/02/08   $   1,309,444   $   1,400,431
Redeemable Preferred Stock Series A (B)                                       678 shs.   09/02/08           6,629           3,288
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                        6,778 shs.   09/02/08          59,661            --
                                                                                                    -------------   -------------
                                                                                                        1,375,734       1,403,719
                                                                                                    -------------   -------------
T H I Acquisition, Inc.
A machine servicing company providing value-added steel services to long steel products.
12% Senior Subordinated Note due 2016                                    $   1,350,000   01/14/08       1,295,226       1,215,000
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                            5 shs.   01/14/08          46,617            --
                                                                                                    -------------   -------------
                                                                                                        1,341,843       1,215,000
                                                                                                    -------------   -------------
Telecorps Holdings, Inc.
A provider of equipment and services to producers of television shows and motion pictures.
12.75% Senior Subordinated Note due 2016                                 $   1,681,677          *       1,474,695       1,429,425
Common Stock (B)                                                              143 shs.   09/02/09           5,823            --
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                        4,187 shs.          *         173,349            --
                                                                                                    -------------   -------------
* 05/20/09 and 09/02/09.                                                                                1,653,867       1,429,425
                                                                                                    -------------   -------------
Terra Renewal LLC
A provider of wastewater residual management and required environmental reporting, permitting, nutrient management planning and
record keeping to companies involved in poultry and food processing.
12% Senior Subordinated Note due 2014                                    $     664,062          *         640,592         332,031
6.79% Term Note due 2012 (C)                                             $     779,010          *         776,285         701,109
8.75% Term Note due 2012 (C)                                             $         832          *             832             749
Limited Partnership Interest of
  Saw Mill Capital Fund V, LLC (B)                                          2.27% int.         **          85,245            --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                           41 shs.   04/28/06          33,738            --
                                                                                                    -------------   -------------
* 04/28/06 and 09/13/06. **03/01/05 and 10/10/08.                                                       1,536,692       1,033,889
                                                                                                    -------------   -------------
Torrent Group Holdings, Inc.
A contractor specializing in the sales and installation of engineered drywells for the retention and filtration of stormwater and
nuisance water flow.
14.5% Senior Subordinated Note due 2013 (D)                              $   1,300,003   10/26/07       1,113,016            --
Series B Preferred Stock (B)                                                   97 shs.   03/31/10            --              --
Common Stock (B)                                                              273 shs.   03/31/10         219,203            --
                                                                                                    -------------   -------------
                                                                                                        1,332,219            --
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
30                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Total E & S, Inc.
A manufacturer of a wide variety of equipment used in the oil and gas industry.
10.5% Senior Secured Term Note due 2013                                  $     486,487   03/02/07   $     484,184   $     481,688
13% Senior Subordinated Note due 2014                                    $     341,971   03/02/07         280,347         324,872
                                                                                                    -------------   -------------
                                                                                                          764,531         806,560
                                                                                                    -------------   -------------
Transpac Holding Company
A designer, importer, and wholesaler of home decor and seasonal gift products.
14% Senior Subordinated Note due 2015 (D)                                $     938,651   10/31/07         873,498         891,718
Common Stock (B)                                                              110 shs.   10/31/07         110,430            --
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                           50 shs.   10/31/07          46,380            --
                                                                                                    -------------   -------------
                                                                                                        1,030,308         891,718
                                                                                                    -------------   -------------
Tranzonic Companies (The)
A producer of commercial and industrial supplies, such as safety products, janitorial supplies, work apparel, washroom and restroom
supplies and sanitary care products.
13% Senior Subordinated Note due 2013                                    $   1,356,000   02/05/98       1,340,791       1,356,000
Common Stock (B)                                                              315 shs.   02/04/98         315,000         336,099
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                          222 shs.   02/05/98         184,416         236,870
                                                                                                    -------------   -------------
                                                                                                        1,840,207       1,928,969
                                                                                                    -------------   -------------
Truck Bodies & Equipment International
A designer and manufacturer of accessories for heavy and medium duty trucks, primarily dump bodies, hoists, various forms of flatbed
bodies, landscape bodies and other accessories.
12% Senior Subordinated Note due 2014 (D)                                $   1,222,698          *       1,102,399       1,100,428
Preferred Stock Series B (B)                                                  128 shs.   10/20/08         127,677            --
Common Stock (B)                                                              393 shs.          *         423,985            --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                           81 shs.          *          84,650            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          558 shs.   10/20/08            --              --
                                                                                                    -------------   -------------
* 07/19/05 and 12/22/05.                                                                                1,738,711       1,100,428
                                                                                                    -------------   -------------
TruStile Doors, Inc.
A manufacturer and distributor of interior doors.
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                        3,060 shs.   04/11/03          36,032             498
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    31


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
U M A Enterprises, Inc.
An importer and wholesaler of home decor products.
15% Senior Subordinated Note due 2015                                    $     960,079   02/08/08   $     944,614   $     964,679
Convertible Preferred Stock (B)                                               470 shs.   02/08/08         469,565         333,420
                                                                                                    -------------   -------------
                                                                                                        1,414,179       1,298,099
                                                                                                    -------------   -------------
U-Line Corporation
A manufacturer of high-end, built-in, undercounter ice making, wine storage and refrigeration appliances.
12.5% Senior Subordinated Note due 2012                                  $     946,675   04/30/04         916,840         901,399
Common Stock (B)                                                               96 shs.   04/30/04          96,400          34,432
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                          122 shs.   04/30/04         112,106          43,576
                                                                                                    -------------   -------------
                                                                                                        1,125,346         979,407
                                                                                                    -------------   -------------
Visioneering, Inc.
A designer and manufacturer of tooling and fixtures for the aerospace industry.
10.5% Senior Secured Term Loan due 2013                                  $     458,824   05/17/07         453,761         446,511
13% Senior Subordinated Note due 2014                                    $     370,588   05/17/07         342,251         354,711
18% PIK Convertible Preferred Stock (B)                                    21,361 shs.   03/13/09          41,440            --
Common Stock (B)                                                           70,588 shs.   05/17/07          70,588            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                       20,003 shs.   05/17/07          31,460            --
                                                                                                    -------------   -------------
                                                                                                          939,500         801,222
                                                                                                    -------------   -------------
Vitex Packaging Group, Inc.
A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags.
10% Senior Subordinated PIK Note due 2011                                $     91,867   10/29/09           86,386          87,274
5% Senior Subordinated PIK Note due 2011 (D)                             $    450,000   06/30/07          392,576         427,500
Class B Unit (B)                                                         406,525 uts.   10/29/09          184,266            --
Class C Unit (B)                                                         450,000 uts.   10/29/09          413,244         246,460
Limited Liability Company Unit Class A (B)                               383,011 uts.          *          229,353            --
Limited Liability Company Unit Class B (B)                                96,848 uts.   07/19/04           96,848            --
                                                                                                    -------------   -------------
* 07/19/04 and 10/29/09.                                                                                1,402,673         761,234
                                                                                                    -------------   -------------
Wellborn Forest Holding Co.
A manufacturer of semi-custom kitchen and bath cabinetry.
12.13% Senior Subordinated Note due 2014                                 $    911,250   11/30/06          863,591         865,688
Common Stock (B)                                                             101 shs.   11/30/06          101,250          35,798
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                          51 shs.   11/30/06           45,790          17,873
                                                                                                    -------------   -------------
                                                                                                        1,010,631         919,359
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
32                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                             PERCENTAGE      DATE         COST         FAIR VALUE
                                                                         -------------   --------   -------------   -------------
                                                                                                        
Wheaton Holding Corporation
A distributor and manufacturer of laboratory supply products and packaging.
13% Senior Subordinated Note due 2017                                    $   1,000,000   06/08/10   $     913,334   $   1,003,248
Preferred Stock Series B (B)                                                  703 shs.   06/08/10          70,308               7
Common Stock (B)                                                              353 shs.   06/08/10             353               4
                                                                                                    -------------   -------------
                                                                                                          983,995       1,003,259
                                                                                                    -------------   -------------
Whitcraft Holdings, Inc.
A leading independent manufacturer of precision formed, machined, and fabricated flight-critical aerospace components.
12% Senior Subordinated Note due 2018                                    $     794,521   12/16/10         729,306         790,134
Common Stock (B)                                                              205 shs.   12/16/10         205,480         195,206
Warrant, exercisable until 2015, to purchase
  common stock at $.02 per share (B)                                           55 shs.   12/16/10          49,334               1
                                                                                                    -------------   -------------
                                                                                                          984,120         985,341
                                                                                                    -------------   -------------
Workplace Media Holding Co.
A direct marketer specializing in providing advertisers with access to consumers in the workplace.
13% Senior Subordinated Note due 2015                                    $     654,247   05/14/07         599,356         327,123
Limited Partnership Interest (B)                                           12.26% int.   05/14/07          61,308            --
Warrant, exercisable until 2015, to purchase
  common stock at $.02 per share (B)                                           47 shs.   05/14/07          44,186            --
                                                                                                    -------------   -------------
                                                                                                          704,850         327,123
                                                                                                    -------------   -------------
Xaloy Superior Holdings, Inc.
A provider of melt processing components and ancillary equipment for both plastic injection molding and extrusion applications.
15.5% Senior Subordinated Note due 2015 (D)                              $   1,229,741   09/08/08       1,203,293       1,168,254
Common Stock (B)                                                              150 shs.   09/08/08         150,000          51,605
                                                                                                    -------------   -------------
                                                                                                        1,353,293       1,219,859
                                                                                                    -------------   -------------

Total Private Placement Investments (E)                                                               117,988,681     107,507,131
                                                                                                    -------------   -------------




---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    33


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                                       SHARES OR
                                                             INTEREST      DUE         PRINCIPAL                        MARKET
CORPORATE RESTRICTED SECURITIES:(A) (Continued)                RATE        DATE         AMOUNT           COST            VALUE
                                                              ------     --------    ------------    ------------    ------------
RULE 144A SECURITIES - 0.98%:(A)
                                                                                                      
Bonds - 0.98%
ArcelorMittal                                                 6.125%     06/01/18    $    500,000    $    518,666    $    532,744
Cenveo Corporation                                           10.500      08/15/16          45,000          45,000          44,213
Coffeyville Resources LLC                                     9.000      04/01/15          62,000          61,697          66,340
NBC Universal                                                 5.150      04/30/20         500,000         499,295         518,311
                                                                                                     ------------    ------------
  Total Bonds                                                                                           1,124,658       1,161,608
                                                                                                     ------------    ------------
Convertible Preferred Stock - 0.00%
ETEX Corporation (B)                                                                          194             179           --
                                                                                                     ------------    ------------
  Total Convertible Preferred Stock                                                                           179           --
                                                                                                     ------------    ------------
Preferred Stock - 0.00%
TherOX, Inc. (B)                                                                               26           1,032           --
                                                                                                     ------------    ------------
  Total Preferred Stock                                                                                     1,032           --
                                                                                                     ------------    ------------
Common Stock - 0.00%
Touchstone Health Partnership (B)                                                             292           1,062           --
                                                                                                     ------------    ------------
  Total Common Stock                                                                                        1,062           --
                                                                                                     ------------    ------------
  Total Rule 144A Securities                                                                            1,126,931       1,161,608
                                                                                                     ------------    ------------
Total Corporate Restricted Securities                                                                $119,115,612    $108,668,739
                                                                                                     ------------    ------------


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34                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                                       SHARES OR
                                                             INTEREST      DUE         PRINCIPAL                        MARKET
CORPORATE PUBLIC SECURITIES-9.99%:(A)                          RATE        DATE         AMOUNT           COST            VALUE
                                                              ------     --------    ------------    ------------    ------------
                                                                                                      
Bonds - 9.85%
ACCO Brands Corporation                                      10.625%     03/15/15    $     45,000    $     44,456    $     50,625
Affinia Group, Inc.                                           9.000      11/30/14          25,000          24,250          25,688
Allegheny Technologies, Inc.                                  9.375      06/12/19         500,000         520,218         584,122
Allied Waste NA                                               7.125      05/15/16         500,000         506,173         529,375
C R H America, Inc.                                           5.300      10/15/13         500,000         418,430         536,546
Centurytel, Inc.                                              5.000      02/15/15         500,000         514,041         510,562
Citigroup, Inc.                                               5.500      04/11/13         500,000         437,890         532,415
Cytec Industries, Inc.                                        8.950      07/01/17         600,000         603,568         729,538
Equifax, Inc.                                                 4.450      12/01/14         500,000         515,534         526,278
GATX Corporation                                              4.750      05/15/15         500,000         512,015         523,393
Gannett Company, Inc.                                         9.375      11/15/17          60,000          59,149          66,900
General Electric Capital Corporation                          5.500      01/08/20         500,000         498,050         534,744
Goldman Sachs Group, Inc.                                     4.750      07/15/13         500,000         418,645         532,636
International Game Technology                                 7.500      06/15/19         500,000         499,720         562,830
Johnson Controls, Inc.                                        5.500      01/15/16         500,000         398,125         546,775
Kraft Foods, Inc.                                             5.375      02/10/20         500,000         516,353         538,135
Masco Corporation                                             7.125      03/15/20         350,000         349,993         366,145
Morgan Stanley                                                5.500      01/26/20         500,000         497,305         504,013
Nortek, Inc.                                                 11.000      12/01/13         100,444          98,956         106,973
Owens Corning, Inc.                                           9.000      06/15/19          30,000          29,516          35,196
Pride International, Inc.                                     6.875      08/15/20          30,000          30,000          31,125
Qwest Diagnostic, Inc.                                        4.750      01/30/20         500,000         498,665         494,546
Sealed Air Corporations                                       7.875      06/15/17         500,000         493,099         549,849
The Valspar Corporation                                       7.250      06/15/19         500,000         501,340         576,682
Time Warner Cable, Inc.                                       5.000      02/01/20         500,000         489,790         514,569
Tyco Electronics Group SA                                     6.550      10/01/17         500,000         457,495         568,208
Tyco International Group SA                                   8.500      01/15/19         125,000         124,996         159,998
W P P Finance Corporation                                     5.875      06/15/14         500,000         506,779         540,213
                                                                                                     ------------    ------------
  Total Bonds                                                                                          10,564,551      11,778,079
                                                                                                     ------------    ------------

Common Stock - 0.14%
Directed Electronics, Inc. (B)                                                            195,118         982,867         152,192
Intrepid Potash, Inc. (B)                                                                     185           5,920           6,899
Nortek, Inc. (B)                                                                              100               1           3,600
Rue21, Inc. (B)                                                                               350           6,650          10,258
                                                                                                     ------------    ------------
  Total Common Stock                                                                                      995,438         172,949
                                                                                                     ------------    ------------

Total Corporate Public Securities                                                                    $ 11,559,989    $ 11,951,028
                                                                                                     ------------    ------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    35


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                                                 INTEREST
                                                               RATE/       DUE         PRINCIPAL                        MARKET
CORPORATE PUBLIC SECURITIES:(A)(Continued)                    YIELD^       DATE         AMOUNT           COST            VALUE
                                                              ------     --------    ------------    ------------    ------------
                                                                                                      
Short-Term Securities:
Commercial Paper - 8.41%
AGL Capital Corporation                                       0.370%     01/12/11    $  1,500,000    $  1,499,830    $  1,499,830
Apache Corporation                                            0.370      01/04/11       1,500,000       1,499,954       1,499,954
Carnival PLC                                                  0.350      01/06/11       1,525,000       1,524,926       1,524,926
ERAC USA Finance Company                                      0.370      01/03/11       1,525,000       1,524,969       1,524,969
Nissan Motor Acceptance Corporation                           0.370      01/07/11       2,000,000       1,999,877       1,999,877
United Health Group, Inc.                                     0.400      01/03/11       2,000,000       1,999,955       1,999,955
                                                                                                     ------------    ------------
  Total Short-Term Securities                                                                        $ 10,049,511    $ 10,049,511
                                                                                                     ------------    ------------
Total Investments                                            109.31%                                 $140,725,112    $130,669,278
                                                                                                     ============    ------------
  Other Assets                                                 3.90                                                     4,661,304
  Liabilities                                                (13.21)                                                  (15,790,347)
                                                             ------                                                  ------------
Total Net Assets                                             100.00%                                                 $119,540,235
                                                             ======                                                  ============


(A) In each of the convertible note, warrant, and common stock investments, the issuer has agreed to provide certain registration
    rights.
(B) Non-income producing security.
(C) Variable rate security; rate indicated is as of December 31, 2010.
(D) Defaulted security; interest not accrued.
(E) Illiquid security. As of December 31, 2010, the values of these securities amounted to $107,507,131 or 89.93% of net assets.
 ^  Effective yield at purchase
PIK - Payment-in-kind


---------------------------------------------------------------------------------------------------------------------------------
36                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value                                                          Market Value
                                                ------------                                                          ------------
                                                                                                             
AEROSPACE - 3.04%                                                     BUILDINGS & REAL ESTATE - 2.21%
A E Company, Inc.                               $  1,849,144          K W P I Holdings Corporation                    $  1,244,323
Visioneering, Inc.                                   801,222          Masco Corporation                                    366,145
Whitcraft Holdings, Inc.                             985,341          Owens Corning, Inc.                                   35,196
                                                ------------          Sunrise Windows Holding Co.                          997,675
                                                   3,635,707          TruStile Doors, Inc.                                     498
                                                ------------                                                          ------------
AUTOMOBILE - 4.29%                                                                                                       2,643,837
F H Equity LLC                                       501,330                                                          ------------
J A C Holding Enterprises, Inc.                      988,252          CHEMICAL, PLASTICS & RUBBER - 0.90%
Jason Partners Holdings LLC                           25,511          Capital Specialty Plastics, Inc.                     578,555
Johnson Controls, Inc.                               546,775          Nicoat Acquisitions LLC                              494,159
Nyloncraft, Inc.                                   1,630,972                                                          ------------
Ontario Drive & Gear Ltd.                            666,448                                                             1,072,714
Qualis Automotive LLC                                774,963                                                          ------------
                                                ------------          CONSUMER PRODUCTS - 10.92%
                                                   5,134,251          Aero Holdings, Inc.                                1,718,762
                                                ------------          Bravo Sports Holding Corporation                   1,343,106
BEVERAGE, DRUG & FOOD - 6.51%                                         Custom Engineered Wheels, Inc.                     1,484,814
Eatem Holding Company                                986,206          K N B Holdings Corporation                         1,572,646
F F C Holding Corporation                            987,004          Manhattan Beachwear Holding Company                1,261,561
Golden County Foods Holding, Inc.                    513,158          Momentum Holding Co.                                 326,285
Hospitality Mints Holding Company                  1,359,516          Nissan Motor Acceptance Corporation                1,999,877
Kraft Foods, Inc.                                    538,135          R A J Manufacturing Holdings LLC                   1,422,792
L H D Europe Holding, Inc.                            12,825          The Tranzonic Companies                            1,928,969
Snacks Parent Corporation                          1,018,834                                                          ------------
Spartan Foods Holding Company                      1,011,502                                                            13,058,812
Specialty Commodities, Inc.                        1,359,884                                                          ------------
                                                ------------          CONTAINERS, PACKAGING & GLASS - 4.84%
                                                   7,787,064          Flutes, Inc.                                         393,593
                                                ------------          P K C Holding Corporation                          1,832,688
BROADCASTING & ENTERTAINMENT - 1.59%                                  P P T Holdings LLC                                   993,516
NBC Universal                                        518,311          Paradigm Packaging, Inc.                           1,250,300
Time Warner Cable, Inc.                              514,569          Sealed Air Corporation                               549,849
WPP Finance Corporation                              540,213          Vitex Packaging Group, Inc.                          761,234
Workplace Media Holding Co.                          327,123                                                          ------------
                                                ------------                                                             5,781,180
                                                   1,900,216                                                          ------------
                                                ------------

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                                      MassMutual Participation Investors 2010 Annual Report                                    37


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value                                                          Market Value
                                                ------------                                                          ------------
                                                                                                             
DISTRIBUTION - 1.83%                                                  ELECTRONICS - 1.10%
Duncan Systems, Inc.                            $    832,870          Barcodes Group, Inc.                            $    772,542
F C X Holdings Corporation                         1,356,843          Connecticut Electric, Inc.                           385,526
                                                ------------          Directed Electronics, Inc.                           152,192
                                                   2,189,713                                                          ------------
                                                ------------                                                             1,310,260
DIVERSIFIED/CONGLOMERATE,                                                                                             ------------
MANUFACTURING - 12.27%                                                FINANCIAL SERVICES - 2.20%
A H C Holdings Company, Inc.                       1,560,683          Citigroup, Inc.                                      532,415
Arrow Tru-Line Holdings, Inc.                        787,367          GATX Corporation                                     523,393
C D N T, Inc.                                        836,155          General Electric Capital Corporation                 534,744
F G I Equity LLC                                     497,822          Goldman Sachs Group, Inc.                            532,636
G C Holdings, Inc.                                   985,319          Highgate Capital LLC                                    --
K P H I Holdings, Inc.                               978,958          Morgan Stanley                                       504,013
K P I Holdings, Inc.                               1,220,983                                                          ------------
MEGTEC Holdings, Inc.                              1,152,099                                                             2,627,201
Milwaukee Gear Company                             1,212,666                                                          ------------
Nortek, Inc.                                         110,573          HEALTHCARE, EDUCATION & CHILDCARE - 5.94%
O E C Holdings Corporation                           500,432          American Hospice Management Holding LLC            2,194,993
Postle Aluminum Company LLC                        2,505,152          Qwest Diagnostic, Inc.                               494,546
Truck Bodies & Equipment International             1,100,428          Synteract Holdings Corporation                     1,403,719
Xaloy Superior Holdings, Inc.                      1,219,859          United Health Group, Inc.                          1,999,955
                                                ------------          Wheaton Holdings Corporation                       1,003,259
                                                  14,668,496                                                          ------------
                                                ------------                                                             7,096,472
DIVERSIFIED/CONGLOMERATE, SERVICE - 11.88%                                                                            ------------
A S C Group, Inc.                                  1,470,096          HOME & OFFICE FURNISHINGS, HOUSEWARES, AND
A W X Holdings Corporation                           315,000          DURABLE CONSUMER PRODUCTS - 8.90%
ACCO Brands Corporation                               50,625          Connor Sport Court International, Inc.             1,384,224
Advanced Technologies Holdings                     1,507,394          H M Holding Company                                  272,025
Affinia Group, Inc.                                   25,688          Home Decor Holding Company                         1,289,777
Apex Analytix Holding Corporation                  1,381,878          Justrite Manufacturing Acquisition Co.               957,977
Associated Diversified Services                      686,213          K H O F Holdings, Inc.                               116,337
C R H America, Inc.                                  536,546          Monessen Holding Corporation                         884,856
Clough, Harbour and Associates                     1,421,500          Royal Baths Manufacturing Company                    347,862
Crane Rental Corporation                           1,190,998          Stanton Carpet Holding Co.                         1,296,533
Equifax, Inc.                                        526,278          Transpac Holdings Company                            891,718
Insurance Claims Management, Inc.                    205,141          U M A Enterprises, Inc.                            1,298,099
Mail Communications Group, Inc.                      723,230          U-Line Corporation                                   979,407
Nesco Holdings Corporation                         1,693,192          Wellborn Forest Holding Co.                          919,359
Northwest Mailing Services, Inc.                   1,739,212                                                          ------------
Pearlman Enterprises, Inc.                              --                                                              10,638,174
Tyco International Group                             728,206                                                          ------------
                                                ------------
                                                  14,201,197
                                                ------------

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38                                    MassMutual Participation Investors 2010 Annual Report


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value                                                          Market Value
                                                ------------                                                          ------------
                                                                                                             
LEISURE, AMUSEMENT, ENTERTAINMENT - 3.04%                             NATURAL RESOURCES - 2.84%
Carnival PLC                                    $  1,524,926          Apache Corporation                              $  1,499,954
International Game Technology                        562,830          ArcelorMittal                                        532,744
Savage Sports Holding, Inc.                        1,540,405          Cenveo Corporation                                    44,213
                                                ------------          Cytec Industries, Inc.                               729,538
                                                   3,628,161          Intrepid Potash, Inc.                                  6,899
                                                ------------          The Valspar Corporation                              576,682
MACHINERY - 7.75%                                                                                                     ------------
A S A P Industries LLC                               799,087                                                             3,390,030
Davis-Standard LLC                                 1,282,636                                                          ------------
E S P Holdco, Inc.                                 1,274,156          OIL & GAS - 2.76%
M V I Holding, Inc.                                  605,284          Coffeyville Resources LLC                             66,340
Motion Controls Holdings                             991,987          International Offshore Services LLC                1,363,836
Navis Global                                         472,220          MBWS Ultimate Holdco, Inc.                         1,032,981
NetShape Technologies, Inc.                          433,846          Pride International, Inc.                             31,125
Pacific Consolidated Holdings LLC                    620,876          Total E & S, Inc.                                    806,560
Power Services Holding Company                     1,268,091                                                          ------------
R E I Delaware Holding, Inc.                       1,355,247                                                             3,300,842
Safety Speed Cut Manufacturing                                                                                        ------------
  Company, Inc.                                      165,693          PHARMACEUTICALS - 1.24%
                                                ------------          CorePharma LLC                                     1,485,362
                                                   9,269,123                                                          ------------
                                                ------------          PUBLISHING/PRINTING - 0.06%
MEDICAL DEVICES/BIOTECH - 3.76%                                       Gannett Company, Inc.                                 66,900
Coeur, Inc.                                          701,421                                                          ------------
E X C Acquisition Corporation                         41,372          RETAIL STORES - 0.01%
ETEX Corporation                                        --            Rue21, Inc.                                           10,258
MedSystems Holdings LLC                              700,312                                                          ------------
MicroGroup, Inc.                                   1,208,526          TECHNOLOGY - 1.87%
OakRiver Technology, Inc.                            347,821          Sencore Holding Company                              794,423
Precision Wire Holding Company                     1,494,226          Smart Source Holdings LLC                          1,445,431
TherOX, Inc.                                            --                                                            ------------
                                                ------------                                                             2,239,854
                                                   4,493,678                                                          ------------
                                                ------------
MINING, STEEL, IRON & NON-PRECIOUS
METALS - 1.51%
Allegheny Technology, Inc.                           584,122
T H I Acquisition, Inc.                            1,215,000
                                                ------------
                                                   1,799,122
                                                ------------

---------------------------------------------------------------------------------------------------------------------------------
                                      MassMutual Participation Investors 2010 Annual Report                                    39


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
December 31, 2010

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value                                                          Market Value
                                                ------------                                                          ------------
                                                                                                             
TELECOMMUNICATIONS - 2.22%                                            WASTE MANAGEMENT / POLLUTION - 1.31%
All Current Holding Company                     $    712,604          Allied Waste NA                                 $    529,375
Centurytel, Inc.                                     510,562          Terra Renewal LLC                                  1,033,889
Sundance Investco LLC                                   --            Torrent Group Holdings, Inc.                            --
Telecorps Holdings, Inc.                           1,429,425                                                          ------------
                                                ------------                                                             1,563,264
                                                   2,652,591                                                          ------------
                                                ------------          Total Investments - 109.31%                     $130,669,278
TRANSPORTATION - 1.27%                                                                                                ============
ERAC USA Finance Company                           1,524,969
NABCO, Inc.                                             --
                                                ------------
                                                   1,524,969
                                                ------------
UTILITIES - 1.25%
AGL Capital Corporation                            1,499,830
                                                ------------









See Notes to Consolidated Financial Statements
---------------------------------------------------------------------------------------------------------------------------------
40                                    MassMutual Participation Investors 2010 Annual Report


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.    HISTORY
      MassMutual Participation Investors (the "Trust") was organized as a
      Massachusetts business trust under the laws of the Commonwealth of
      Massachusetts pursuant to a Declaration of Trust dated April 7, 1988.

      The Trust is a diversified closed-end management investment company.
      Babson Capital Management LLC ("Babson Capital"), a wholly-owned indirect
      subsidiary of Massachusetts Mutual Life Insurance Company ("MassMutual"),
      acts as its investment adviser. The Trust's investment objective is to
      maximize total return by providing a high level of current income, the
      potential for growth of income, and capital appreciation. The Trust's
      principal investments are privately placed, below-investment grade,
      long-term debt obligations purchased directly from their issuers, which
      tend to be smaller companies. At least half of these investments normally
      include equity features such as common stock, warrants, conversion rights,
      or other equity features that provide the Trust with the opportunity to
      realize capital gains. The Trust will also invest in publicly traded debt
      securities (including high yield securities), again with an emphasis on
      those with equity features, and in convertible preferred stocks and,
      subject to certain limitations, readily marketable equity securities.
      Below-investment grade or high yield securities have predominantly
      speculative characteristics with respect to the capacity of the issuer to
      pay interest and repay capital. In addition, the Trust may temporarily
      invest in high quality, readily marketable securities.

      On January 27, 1998, the Board of Trustees authorized the formation of a
      wholly-owned subsidiary of the Trust ("MMPI Subsidiary Trust") for the
      purpose of holding certain investments. The results of the MMPI Subsidiary
      Trust are consolidated in the accompanying financial statements. Footnote
      2.D below discusses the federal tax consequences of the MMPI Subsidiary
      Trust.

2.    SIGNIFICANT ACCOUNTING POLICIES
      The following is a summary of significant accounting policies followed
      consistently by the Trust in the preparation of its consolidated financial
      statements in conformity with accounting principles generally accepted in
      the United States of America.

      A. VALUATION OF INVESTMENTS:
      Nearly all securities which are acquired by the Trust directly from the
      issuers and shares into which such securities may be converted or which
      may be purchased on the exercise of warrants attached to such securities
      will be subject to legal or contractual delays in, or restrictions on,
      resale and will therefore be "restricted securities." Generally speaking,
      as contrasted with open-market sales of unrestricted securities (public
      securities), which may be effected immediately if the market is adequate,
      restricted securities can be sold only in a public offering for which a
      registration statement is in effect under the Securities Act of 1933, as
      amended (the "1933 Act") or pursuant to a transaction that is exempt from
      registration under the 1933 Act. Restricted securities that are valued
      using public information, such as observable trades or market quotations,
      are reflected as restricted securities at market value. Valuation of
      securities in the Trust's portfolio is made on the basis of the market
      price whenever market quotations are readily available.

      The value of restricted securities at fair value, and of any other assets
      for which there are no reliable market quotations, is the fair value as
      determined in good faith by the Trust's Board of Trustees (the
      "Trustees"). Each restricted security is valued by the Trustees at the
      time of its acquisition and at least quarterly thereafter. The Trustees
      have established guidelines to aid in the valuation of each security.
      Generally, restricted securities are initially valued at cost at the time
      of acquisition by the Trust. Values greater or less than cost are used
      thereafter for restricted securities in appropriate circumstances. Among
      the factors ordinarily considered in the valuation of debt and equity
      securities at fair value are the results of various valuation methods,
      which may include comparable company valuation analyses, discounted future
      cash flow models and recent private transactions. As part of the valuation
      process, we may take into account the following types of factors, if
      relevant, in determining the fair value of our investments: the enterprise
      value of a portfolio company (an estimate of the total fair value of the
      portfolio company's debt and equity), the portfolio company's earnings,
      the markets in which the portfolio company does business, a comparison of
      the portfolio company's securities to publicly traded securities, changes
      in the interest rate environment and the credit markets generally that may
      affect the price at which similar investments may be made in the future
      and other relevant factors. Consideration is also given to corporate
      governance, marketability, company and industry results and outlooks, and
      general market conditions. The determination of fair value involves
      subjective judgments. As a result, using fair value to price a security
      may result in a price materially different from the price used by other
      investors or the price that may be realized up on the actual sale of the
      security. All of these factors are in accordance with the authoritative
      guidance on fair value measurements under accounting principles generally
      accepted in the authoritative guidance on fair value measurements under
      accounting principles generally accepted in the United States of America
      ("U.S. GAAP"). In making valuations, opinions of counsel may be relied
      upon as to whether or not securities are restricted securities and as to
      the legal requirements for public sale.

      When market quotations are readily available for unrestricted securities
      of an issuer, restricted securities of the same class are generally valued
      at a discount from the market price of such unrestricted securities. The
      Trustees, however, consider all factors in fixing any discount, including
      the filing of a registration statement for such securities under the 1933
      Act and any other developments which are likely to increase the
      probability that the securities may be publicly sold by the Trust without
      restriction.

--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

      The Trustees meet at least once each quarter to approve the value of the
      Trust's portfolio securities as of the close of business on the last
      business day of the preceding quarter. This valuation requires the
      approval of a majority of the Trustees of the Trust, including a majority
      of the Trustees who are not interested persons of the Trust or of Babson
      Capital. In making valuations, the Trustees will consider reports by
      Babson Capital analyzing each portfolio security in accordance with the
      relevant factors referred to above. Babson Capital has agreed to provide
      such reports to the Trust at least quarterly.

      The consolidated financial statements include private placement restricted
      securities valued at $107,507,131 (89.93% of net assets) as of December
      31, 2010 whose values have been estimated by the Trustees in the absence
      of readily ascertainable market values. Due to the inherent uncertainty of
      valuation, those estimated values may differ significantly from the values
      that would have been used had a ready market for the securities existed,
      and the differences could be material.

      The values for Rule 144A restricted securities and corporate public
      securities are stated at the last reported sales price or at prices based
      upon quotations obtained from brokers and dealers as of December 31, 2010,
      subject to discount where appropriate, and are approved by the Trustees.

      Short-term securities with more than sixty days to maturity are valued at
      fair value and short-term securities having a maturity of sixty days or
      less are valued at amortized cost, which approximates market value.

      In accordance with the authoritative guidance on fair value measurements
      and disclosures under U.S. GAAP, the Trust discloses the fair value of its
      investments in a hierarchy that prioritizes the inputs to valuation
      techniques used to measure the fair value. The hierarchy gives the highest
      priority to valuations based upon unadjusted quoted prices in active
      markets for identical assets or liabilities (level 1 measurement) and the
      lowest priority to valuations based upon unobservable inputs that are
      significant to the valuation (level 3 measurements). The guidance
      establishes three levels of the fair value hierarchy as follows:

      Level 1: quoted prices in active markets for identical securities
      Level 2: other significant observable inputs (including quoted prices for
               similar securities, interest rates, prepayment speeds, credit
               risk, etc.)
      Level 3: significant unobservable inputs (including the Trust's own
               assumptions in determining the fair value of investments)

The following is a summary of the inputs used to value the Trust's net assets as
of December 31, 2010:


ASSETS:                      TOTAL           LEVEL 1         LEVEL 2         LEVEL 3
--------------------------------------------------------------------------------------
                                                             
  Restricted Securities
    Corporate Bonds      $  92,637,311   $           -   $   1,161,608   $  91,475,703
    Common Stock - U.S.      7,253,165               -               -       7,253,165
    Preferred Stock          4,615,621               -               -       4,615,621
    Partnerships and LLCs    4,162,642               -               -       4,162,642
  Public Securities
    Corporate Bonds         11,778,079               -      11,778,079               -
    Common Stock - U.S.        172,949         172,949               -               -
  Short-term Securities     10,049,511               -      10,049,511               -
--------------------------------------------------------------------------------------
  TOTAL                  $ 130,669,278   $     172,949   $  22,989,198   $ 107,507,131


Following is a reconciliation of Level 3 assets for which significant
unobservable inputs were used to determine fair value:


                                                                                                           UNREALIZED
                                           TOTAL GAINS     PURCHASES,                                   GAINS & LOSSES
                          BEGINNING         OR LOSSES  SALES, ISSUANCES  TRANSFERS IN        ENDING      IN NET INCOME
                           BALANCE         (REALIZED/   & SETTLEMENTS        AND/OR        BALANCE AT     FROM ASSETS
ASSETS:                  AT 12/31/2009     UNREALIZED)       (NET)      OUT OF LEVEL 3     12/31/2010     STILL HELD
----------------------------------------------------------------------------------------------------------------------
                                                                                          
  Restricted Securities
    Corporate Bonds      $  81,465,949   $   2,674,908   $   7,334,847   $           -   $  91,475,704   $   1,127,410
    Common Stock - U.S.      7,767,378       2,053,326      (2,567,540)              -       7,253,164         737,148
    Preferred Stock          3,468,130       2,043,458        (895,967)              -       4,615,621       1,441,707
    Partnerships and LLCs    3,536,247       2,158,867      (1,532,472)              -       4,162,642         641,990
----------------------------------------------------------------------------------------------------------------------
                         $  96,237,704   $   8,930,559   $   2,338,868   $           -   $ 107,507,131   $   3,948,255
----------------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------
42           MassMutual Participation Investors 2010 ANNUAL REPORT

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

      The inputs and methodology used for valuing securities are not necessarily
      an indication of the risk associated with investing in those securities.

      B. ACCOUNTING FOR INVESTMENTS:
      Investment transactions are accounted for on the trade date. Dividend
      income is recorded on the ex-dividend date. Interest income is recorded on
      the accrual basis, including the amortization of premiums and accretion of
      discounts on bonds held using the yield-to-maturity method. The Trust does
      not accrue income when payment is delinquent and when management believes
      payment is questionable.

      Realized gains and losses on investment transactions and unrealized
      appreciation and depreciation of investments are reported for financial
      statement and Federal income tax purposes on the identified cost method.

      C. USE OF ESTIMATES:
      The preparation of financial statements in conformity with accounting
      principles generally accepted in the United States of America requires
      management to make estimates and assumptions that affect the reported
      amounts of assets and liabilities and disclosure of contingent assets and
      liabilities at the date of the financial statements and the reported
      amounts of revenues and expenses during the reporting period. Actual
      results could differ from those estimates.

      D. FEDERAL INCOME TAXES:
      The Trust has elected to be taxed as a "regulated investment company"
      under the Internal Revenue Code, and intends to maintain this
      qualification and to distribute substantially all of its net taxable
      income to its shareholders. In any year when net long-term capital gains
      are realized by the Trust, management, after evaluating the prevailing
      economic conditions, will recommend that Trustees either designate the net
      realized long-term gains as undistributed and pay the federal capital
      gains taxes thereon, or distribute all or a portion of such net gains. For
      the year ended December 31, 2010, the Trust had a net realized taxable
      long-term capital gain balance of $695,446, which the Trustees voted to
      retain and pay the federal capital gain tax thereon. The Trust has
      incurred income tax expense of $243,207 on the Statement of Operations
      related to the retained realized capital gains.

      The Trust is taxed as a regulated investment company and is therefore
      limited as to the amount of non-qualified income that it may receive as
      the result of operating a trade or business, e.g. the Trust's pro rata
      share of income allocable to the Trust by a partnership operating company.
      The Trust's violation of this limitation could result in the loss of its
      status as a regulated investment company, thereby subjecting all of its
      net income and capital gains to corporate taxes prior to distribution to
      its shareholders. The Trust, from time-to-time, identifies investment
      opportunities in the securities of entities that could cause such trade or
      business income to be allocable to the Trust.

      The MMPI Subsidiary Trust (described in Footnote 1, above) was formed in
      order to allow investment in such securities without adversely affecting
      the Trust's status as a regulated investment company.

      Net investment income and net realized gains or losses of the Trust as
      presented under accounting principles generally accepted in the United
      States of America may differ from distributable taxable earnings due to
      earnings from the MMPI Subsidiary Trust as well as certain permanent and
      temporary differences in the recognition of income and realized gains or
      losses on certain investments. Permanent differences will result in
      reclassifications to the capital accounts. In 2010, the Trust increased
      undistributed net investment income and decreased additional paid in
      capital by a total of $95,820 to more accurately display the Trust's
      capital financial position on a tax-basis in accordance with accounting
      principles generally accepted in the United States of America. These
      re-classifications had no impact on net asset value.

      The MMPI Subsidiary Trust is not taxed as a regulated investment company.
      Accordingly, prior to the Trust receiving any distributions from the MMPI
      Subsidiary Trust, all of the MMPI Subsidiary Trust's taxable income and
      realized gains, including non-qualified income and realized gains, is
      subject to taxation at prevailing corporate tax rates. As of December 31,
      2010, the MMPI Subsidiary Trust has incurred income tax expense of
      $284,885.

      Deferred tax assets and liabilities are recognized for the future tax
      consequences attributable to differences between the financial statement
      carrying amounts of the existing assets and liabilities and their
      respective tax basis. For the year ended December 31, 2010, the MMPI
      Subsidiary Trust has a deferred tax liability of $264,465.

      Beginning with the 2009 annual financial statements, the Trust recognizes
      a tax benefit from an uncertain position only if it is more likely than
      not that the position is sustainable, based solely on its technical merits
      and consideration of the relevant taxing authority's widely understood
      administrative practices and precedents. If this threshold is met, the
      Trust measures the tax benefit as the largest amount of benefit that is
      greater than fifty percent likely of being realized upon ultimate
      settlement. The Trust has evaluated and determined that the tax positions
      did not have a material effect on the Trust's financial position and
      results of operations for the year ended December 31, 2010.

      E. DISTRIBUTIONS TO SHAREHOLDERS:
      The Trust records distributions to shareholders from net investment income
      and net realized gains, if any, on the exdividend date. The Trust's net
      investment income dividend is declared four times per year, in April,
      July, October, and December. The Trust's net realized capital gain
      distribution, if any, is declared in December.

--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

      As of December 31, 2010, the components of distributable earnings on a tax
      basis included $1,708,183 of undistributed ordinary income and $452,239 of
      undistributed net realized long term capital gains. Such distributions and
      distributable earnings on a tax basis are determined in conformity with
      income tax regulations, which may differ from accounting principles
      generally accepted in the United States of America.

      The difference between net taxable undistributed earnings to GAAP is
      $136,638 comprised of other timing differences.

      The tax character of distributions declared during the years ended
      December 31, 2010 and 2009 was as follows:

      DISTRIBUTIONS PAID FROM:                2010            2009
                                         -------------   -------------
      Ordinary Income                    $  10,026,104   $   9,955,268
      Long-term Capital Gains            $           -   $           -

      F. EXPENSE REDUCTION:
      Citibank, N.A. ("Citibank") serves as custodian to the Trust. Pursuant to
      the custodian agreement, Citibank receives a fee reduced by credits on
      cash balances the Trust maintains with Citibank. All credit balances, if
      any, used to reduce the Trust's custodian fees are reported as fees paid
      indirectly on the Statement of Operations. For the year ended December 31,
      2010, there were no credit balances used to reduce custodian fees.

3.    INVESTMENT ADVISORY AND ADMINISTRATIVE SERVICES CONTRACT

      A. SERVICES:
      Under an Investment Advisory and Administrative Services Contract (the
      "Contract") with the Trust, Babson Capital has agreed to use its best
      efforts to present to the Trust a continuing and suitable investment
      program consistent with the investment objectives and policies of the
      Trust. Babson Capital represents the Trust in any negotiations with
      issuers, investment banking firms, securities brokers or dealers and other
      institutions or investors relating to the Trust's investments. Under the
      Contract, Babson Capital also provides administration of the day-to-day
      operations of the Trust and provides the Trust with office space and
      office equipment, accounting and bookkeeping services, and necessary
      executive, clerical and secretarial personnel for the performance of the
      foregoing services.

      B. FEE:
      For its services under the Contract, Babson Capital is paid a quarterly
      investment advisory fee equal to 0.225% of the value of the Trust's net
      assets as of the last business day of each fiscal quarter, an amount
      approximately equivalent to 0.90% on an annual basis. A majority of the
      Trustees, including a majority of the Trustees who are not interested
      persons of the Trust or of Babson Capital, approve the valuation of the
      Trust's net assets as of such day.

4.    SENIOR SECURED INDEBTEDNESS
      MassMutual holds the Trust's $12,000,000 Senior Fixed Rate Convertible
      Note (the "Note") issued by the Trust in 1995. The Note, as amended, is
      due December 13, 2011 and accrues interest at 5.80% per annum. MassMutual,
      at its option, can convert the principal amount of the Note into common
      shares. The dollar amount of principal would be converted into an
      equivalent dollar amount of common shares based upon the average price of
      the common shares for ten business days prior to the notice of conversion.
      For the year ended December 31, 2010, the Trust incurred total interest
      expense on the Note of $696,000.

      The Trust may redeem the Note, in whole or in part, at the principal
      amount proposed to be redeemed together with the accrued and unpaid
      interest thereon through the redemption date plus a Make Whole Premium.
      The Make Whole Premium equals the excess of (i) the present value of the
      scheduled payments of principal and interest which the Trust would have
      paid but for the proposed redemption, discounted at the rate of interest
      of U.S. Treasury obligations whose maturity approximates that of the Note
      plus 0.50% over (ii) the principal of the Note proposed to be redeemed.

5.    PURCHASES AND SALES OF INVESTMENTS

                                               FOR THE YEAR ENDED
                                                   12/31/2010
                                         -----------------------------
                                                            PROCEEDS
                                            COST OF           FROM
                                          INVESTMENTS       SALES OR
                                           ACQUIRED        MATURITIES
                                         -------------   -------------
      Corporate restricted securities    $  23,069,419   $  20,772,712
      Corporate public securities            7,082,540      10,101,407

      The aggregate cost of investments is substantially the same for financial
      reporting and federal income tax purposes as of December 31, 2010. The net
      unrealized depreciation of investments for financial reporting and federal
      tax purposes as of December 31, 2010 is $10,055,834 and consists of
      $10,103,926 appreciation and $20,159,760 depreciation.

      Net unrealized depreciation of investments on the Statement of Assets and
      Liabilities reflects the balance net of a deferred tax accrual of $264,465
      on net unrealized gains on the MMPI Subsidiary Trust.

--------------------------------------------------------------------------------
44           MassMutual Participation Investors 2010 ANNUAL REPORT

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

6.    QUARTERLY RESULTS OF INVESTMENT OPERATIONS (UNAUDITED)

                                                 MARCH 31, 2010
                                            AMOUNT         PER SHARE
                                         -------------   -------------
      Investment income                  $   2,911,112
      Net investment income                  2,361,286   $        0.24
      Net realized and unrealized
        gain on investments (net of taxes)     142,746            0.01

                                                  JUNE 30, 2010
                                            AMOUNT         PER SHARE
                                         -------------   -------------
      Investment income                  $   3,007,150
      Net investment income                  2,444,394   $        0.24
      Net realized and unrealized
        gain on investments (net of taxes)   3,134,736            0.32

                                               SEPTEMBER 30, 2010
                                            AMOUNT         PER SHARE
                                         -------------   -------------
      Investment income                  $   3,102,390
      Net investment income                  2,512,502   $        0.25
      Net realized and unrealized
        gain on investments (net of taxes)   5,301,577            0.53

                                               DECEMBER 31, 2010
                                            AMOUNT         PER SHARE
                                         -------------   -------------
      Investment income                  $   3,618,008
      Net investment income                  2,948,246   $        0.29
      Net realized and unrealized
        gain on investments (net of taxes)     966,555            0.09

7.    AGGREGATE REMUNERATION PAID TO OFFICERS, TRUSTEES, AND THEIR AFFILIATED
      PERSONS

      For the year ended December 31, 2010, the Trust paid its Trustees
      aggregate remuneration of $208,050. During the year, the Trust did not pay
      any compensation to any of its Trustees who are "interested persons" (as
      defined by the 1940 Act) of the Trust. The Trust classifies Messrs. Noreen
      and Joyal as "interested persons" of the Trust.

      All of the Trust's officers are employees of Babson Capital. Pursuant to
      the Contract, the Trust does not compensate its officers who are employees
      of Babson Capital (except for the Chief Compliance Officer of the Trust
      unless assumed by Babson Capital). For the year ended December 31, 2010,
      Babson Capital paid the compensation of the Chief Compliance Officer of
      the Trust.

      Mr. Noreen, one of the Trust's Trustees, is an "affiliated person" (as
      defined by the 1940 Act) of MassMutual and Babson Capital.

      The Trust did not make any payments to Babson Capital for the year ended
      December 31, 2010, other than amounts payable to Babson Capital pursuant
      to the Contract.

8.    CERTIFICATIONS
      As required under New York Stock Exchange ("NYSE") Corporate Governance
      Rules, the Trust's principal executive officer has certified to the NYSE
      that he was not aware, as of the certification date, of any violation by
      the Trust of the NYSE's Corporate Governance listing standards. In
      addition, as required by Section 302 of the Sarbanes-Oxley Act of 2002 and
      related SEC rules, the Trust's principal executive and principal financial
      officers have made quarterly certifications, included in filings with the
      Securities and Exchange Commission on Forms N-CSR and N-Q, relating to,
      among other things, the Trust's disclosure controls and procedures and
      internal control over financial reporting, as applicable.

9.    SUBSEQUENT EVENTS
      The Trust has evaluated the possibility of subsequent events existing in
      this report through February 25, 2011. The Trust has determined that there
      are no material events that would require recognition or disclosure in
      this report through this date.

--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            45

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

KPMG LOGO                KPMG LLP                     Telephone +1 617 988 1000
                         Two Financial Center         Fax       +1 617 507 8321
                         60 South Street              Internet  www.us.kpmg.com
                         Boston, MA 02111

The Shareholders and Board of Trustees of MassMutual Participation Investors

We have audited the accompanying consolidated statement of assets and
liabilities of MassMutual Participation Investors (the "Trust"), including the
consolidated schedule of investments, as of December 31, 2010, and the related
consolidated statements of operations and cash flows for the year then ended,
the consolidated statements of changes in net assets for each of the years in
the two-year period then ended, and the consolidated financial highlights for
each of the years in the five-year period then ended. These consolidated
financial statements and consolidated financial highlights are the
responsibility of the Trust's management. Our responsibility is to express an
opinion on these consolidated financial statements and consolidated financial
highlights based on our audits.

We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements and financial highlights are free of material misstatement. An audit
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements. Our procedures included confirmation of
securities owned as of December 31, 2010 by correspondence with the custodian or
by other appropriate auditing procedures. An audit also includes assessing the
accounting principles used and significant estimates made by management, as well
as evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements and consolidated financial
highlights referred to above present fairly, in all material respects, the
financial position of MassMutual Participation Investors as of December 31,
2010, the results of its consolidated statements of operations and cash flow for
the year then ended, changes in its net assets for each of the years in the two
year period then ended, and the consolidated financial highlights for each of
the years in the five year period then ended, in conformity with U.S. generally
accepted accounting principles.

KPMG LLP

Boston, Massachusetts
February 25, 2011


--------------------------------------------------------------------------------
46           MassMutual Participation Investors 2010 ANNUAL REPORT

INTERESTED TRUSTEES

                                                             PRINCIPAL                  PORTFOLIOS
                            POSITION                         OCCUPATIONS                OVERSEEN    OTHER
NAME (AGE),                 WITH         OFFICE TERM/LENGTH  DURING PAST                IN FUND     DIRECTORSHIPS
ADDRESS                     THE TRUST    OF TIME SERVED      5 YEARS                    COMPLEX     HELD BY DIRECTOR
------------------------------------------------------------------------------------------------------------------------------------
                                                                                     
CLIFFORD M. NOREEN* (53)    Trustee      Term expires        President (since 2008),    2           President (since 2009), Senior
                            (since 2009) 2012                Vice Chairman                          Vice President (1996- 2009),
MassMutual                                                   (2007-2008), Member of                 HYP Management LLC (LLC
Participation Investors     Chairman                         the Board of Managers                  Manager); Director (since
1500 Main Street            (since 2009)                     (since 2006), Managing                 2005), MassMutual Corporate
P.O. Box 15189                                               Director (since 2000),                 Value Limited (investment
Springfield, MA 01115-5189                                   Babson Capital; President              company); Director (since
                                                             (2005-2009), Vice                      2005), MassMutual Corporate
                                                             President (1993-2005) of               Value Partners Limited
                                                             the Trust.                             (investment company); Senior
                                                                                                    Vice President (1996-2008),
                                                                                                    MMHC Investment LLC (passive
                                                                                                    investor); Managing Director
                                                                                                    (2006-2009), MassMutual
                                                                                                    Capital Partners LLC
                                                                                                    (investment company); Director
                                                                                                    (since 2008), Jefferies
                                                                                                    Finance LLC (a finance
                                                                                                    company); Chairman and Chief
                                                                                                    Executive Officer (since
                                                                                                    2009), Manager (since 2007),
                                                                                                    MMC Equipment Finance LLC;
                                                                                                    Chairman (since 2009), Trustee
                                                                                                    (since 2005), President
                                                                                                    (2005-2009), MMCI Subsidiary
                                                                                                    Trust and MMPI Subsidiary
                                                                                                    Trust; Chairman (since
                                                                                                    2009),Trustee (since 2009),
                                                                                                    President (2005-2009), Vice
                                                                                                    President (1993-2005),
                                                                                                    MassMutual Corporate Investors
                                                                                                    (closed-end investment company
                                                                                                    advised by Babson Capital);
                                                                                                    and Member of Investment
                                                                                                    Committee (since 1999),
                                                                                                    Diocese of Springfield.

* Mr. Noreen is classified as an "interested person" of each Trust and Babson
  Capital (as defined by the Investment Act of 1940, as amended) because of his
  position as an officer of each Trust and President of Babson Capital.

--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            47

INTERESTED TRUSTEES

                                                             PRINCIPAL                  PORTFOLIOS
                            POSITION                         OCCUPATIONS                OVERSEEN    OTHER
NAME (AGE),                 WITH         OFFICE TERM/LENGTH  DURING PAST                IN FUND     DIRECTORSHIPS
ADDRESS                     THE TRUST    OF TIME SERVED      5 YEARS                    COMPLEX     HELD BY DIRECTOR
------------------------------------------------------------------------------------------------------------------------------------
                                                                                     
ROBERT E. JOYAL* (66)       Trustee      Term expires        President (2001-2003)      67          President (1999-2003) and
                            (since 2003)    2013             of Babson Capital.                     Trustee (since 2003), of the
MassMutual                                                                                          Trust; Director (since 2006),
Participation Investors                                                                             Jefferies Group, Inc.
1500 Main Street                                                                                    (financial services); Director
P.O. Box 15189                                                                                      (since 2003), Alabama Aircraft
Springfield, MA 01115-5189                                                                          Industries, Inc. (aircraft
                                                                                                    maintenance and overhaul);
                                                                                                    Director (since 2007),
                                                                                                    Scottish Re Group Ltd. (global
                                                                                                    life reinsurance specialist);
                                                                                                    Trustee (since 2003),
                                                                                                    MassMutual Select Funds,
                                                                                                    formerly MassMutual
                                                                                                    Institutional Funds, (an
                                                                                                    open-end investment company
                                                                                                    advised by MassMutual);
                                                                                                    Trustee (since 2003), MML
                                                                                                    Series Investment Fund (an
                                                                                                    open-end investment company
                                                                                                    advised by MassMutual);
                                                                                                    Trustee (1998- 2003), Senior
                                                                                                    Vice President (1998-2001) and
                                                                                                    President (2001-2003), MMCI
                                                                                                    Subsidiary Trust and MMPI
                                                                                                    Subsidiary Trust; and
                                                                                                    President (1999- 2003),
                                                                                                    Trustee (since 2003),
                                                                                                    MassMutual Corporate Investors
                                                                                                    (closed-end investment company
                                                                                                    advised by Babson Capital).

* Mr. Joyal retired as President of Babson Capital in June 2003. In addition and
  as noted above, Mr. Joyal is a director of Jefferies Group, Inc., which has a
  wholly owned broker-dealer subsidiary that may execute portfolio transactions
  and/or engage in principal transactions with the Trust, other investment
  companies advised by Babson Capital or any other advisory accounts over which
  Babson Capital has brokerage placement discretion. Accordingly, the Trust has
  determined to classify Mr. Joyal as an "interested person" of the Trust and
  Babson Capital (as defined in the Investment Company Act of 1940, as amended).

--------------------------------------------------------------------------------
48           MassMutual Participation Investors 2010 ANNUAL REPORT

INDEPENDENT TRUSTEES

                                                             PRINCIPAL                  PORTFOLIOS
                            POSITION                         OCCUPATIONS                OVERSEEN    OTHER
NAME (AGE),                 WITH         OFFICE TERM/LENGTH  DURING PAST                IN FUND     DIRECTORSHIPS
ADDRESS                     THE TRUST    OF TIME SERVED      5 YEARS                    COMPLEX     HELD BY DIRECTOR
------------------------------------------------------------------------------------------------------------------------------------
                                                                                     
WILLIAM J. BARRETT (71)     Trustee      Term expires        President (since 2010),      2         Trustee (since 2006),
                            (since 2006)    2012             W J Barrett Associates, Inc.;          MassMutual Corporate Investors
MassMutual                                                   President (2002-2010),                 (a closed-end investment
Participation Investors                                      Barrett-Gardner Associates,            company advised by Babson
1500 Main Street                                             Inc.                                   Capital); Director (since
Suite 600, P.O. Box 15189                                                                           1979), TGC Industries, Inc.
Springfield, MA 01115-5189                                                                          (geophysical services);
                                                                                                    Director and Secretary (since
                                                                                                    2001 and from 1996-1997),
                                                                                                    Chase Packaging Corporation
                                                                                                    (agricultural services);
                                                                                                    Chairman and Director (since
                                                                                                    2000), Rumson-Fair Haven Bank
                                                                                                    and Trust Company (commercial
                                                                                                    bank and trust company); and
                                                                                                    Director (since 1983),
                                                                                                    Executive Vice President,
                                                                                                    Secretary and Assistant
                                                                                                    Treasurer (since 2004),
                                                                                                    Supreme Industries, Inc.
                                                                                                    (specialized truck and body
                                                                                                    manufacturer).


DONALD E. BENSON (80)       Trustee      Term expires        Executive Vice President    2          Director (1997-2008), MAIR
                            (since 1988)    2013             and Director (since 1992),             Holdings, Inc. (commuter
MassMutual                                                   Marquette Financial Companies          airline holding company);
Participation Investors                                      (financial services); Partner          Director (since 1997), First
1500 Main Street                                             (since 1996), Benson Family            California Financial Group,
P.O. Box 15189                                               Limited Partnership No. 1 and          Inc. (bank holding company);
Springfield, MA 01115-5189                                   Benson Family Limited                  and Trustee (since 1986),
                                                             Partnership No. 2 (investment          MassMutual Corporate Investors
                                                             partnerships).                         (closed-end investment company
                                                                                                    advised by Babson Capital).
--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            49


INDEPENDENT TRUSTEES

                                                             PRINCIPAL                  PORTFOLIOS
                            POSITION                         OCCUPATIONS                OVERSEEN    OTHER
NAME (AGE),                 WITH         OFFICE TERM/LENGTH  DURING PAST                IN FUND     DIRECTORSHIPS
ADDRESS                     THE TRUST    OF TIME SERVED      5 YEARS                    COMPLEX     HELD BY DIRECTOR
------------------------------------------------------------------------------------------------------------------------------------
                                                                                     
MICHAEL H. BROWN (54)       Trustee      Term expires        Private Investor; and      2           Trustee (since 2005),
                            (since 2005)    2011             Managing Director                      MassMutual Corporate Investors
MassMutual                                                   (1994-2005), Morgan                    (a closed-end investment
Participation Investors                                      Stanley.                               company advised by Babson
1500 Main Street                                                                                    Capital); Independent Director
P.O. Box 15189                                                                                      (since 2006), Invicta Holdings
Springfield, MA 01115-5189                                                                          LLC (a derivative trading
                                                                                                    company).


DONALD GLICKMAN (77)        Trustee      Term expires        Chairman (since 1992),     2           Director (since 1984), Monro
                            (since 1992)    2013             Donald Glickman and                    Muffler and Brake, Inc.
MassMutual                                                   Company, Inc. (private                 (automobile repair service);
Participation Investors                                      investments); and Partner              Lead Director (1998 - 2009),
1500 Main Street                                             (since 1992), J.F. Lehman &            MSC Software Corp. (simulation
P.O. Box 15189                                               Co. (private investments).             software); and Trustee (since
Springfield, MA 01115-5189                                                                          1992), MassMutual Corporate
                                                                                                    Investors (closed-end
                                                                                                    investment company advised by
                                                                                                    Babson Capital).


--------------------------------------------------------------------------------
50           MassMutual Participation Investors 2010 ANNUAL REPORT



INDEPENDENT TRUSTEES

                                                             PRINCIPAL                  PORTFOLIOS
                            POSITION                         OCCUPATIONS                OVERSEEN    OTHER
NAME (AGE),                 WITH         OFFICE TERM/LENGTH  DURING PAST                IN FUND     DIRECTORSHIPS
ADDRESS                     THE TRUST    OF TIME SERVED      5 YEARS                    COMPLEX     HELD BY DIRECTOR
------------------------------------------------------------------------------------------------------------------------------------
                                                                                     
MARTIN T. HART (75)         Trustee      Term expires        Private Investor; and       2          Director (since 2004), Texas
                            (since 1991)    2012             President and Director                 Roadhouse, Inc. (operates
MassMutual                                                   (since 1983), H Investment             restaurant chain); Director
Participation Investors                                      Company LLC (family                    (since 1999), ValueClick Inc.
1500 Main Street                                             partnership).                          (internet advertising
P.O. Box 15189                                                                                      company); Director (2002 -
Springfield, MA 01115-5189                                                                          2009), Spectranetics Corp.
                                                                                                    (medical device company); and
                                                                                                    Trustee (since 1991),
                                                                                                    MassMutual Corporate Investors
                                                                                                    (closed-end investment company
                                                                                                    advised by Babson Capital).


CORINE T. NORGAARD (73)     Trustee      Term expires        President and Owner (since  34         Trustee (since 2005), MML
                            (since 1998)    2011             2009), Retirement Options              Series Investment Fund II (an
MassMutual                                                   (trains and certifies                  open-end investment company
Participation Investors                                      retirement coaches);                   advised by MassMutual);
1500 Main Street                                             President (2004- 2005),                Trustee (since 2004),
P.O. Box 15189                                               Thompson Enterprises Real              MassMutual Premier Funds (an
Springfield, MA 01115-5189                                   Estate Investment.                     open-end investment company
                                                                                                    advised by MassMutual);
                                                                                                    Director (since 1991), ING
                                                                                                    Series Fund, Inc. (investment
                                                                                                    company); Director (since
                                                                                                    1991), ING Variable Series
                                                                                                    Fund; Director (since 1991),
                                                                                                    ING Strategic Allocations
                                                                                                    Portfolios, Inc. (investment
                                                                                                    company); Director
                                                                                                    (1991-2009), ING GET Fund
                                                                                                    (investment company); and
                                                                                                    Trustee (since 1998),
                                                                                                    MassMutual Corporate Investors
                                                                                                    (a closed-end investment
                                                                                                    company advised by Babson
                                                                                                    Capital).


MALEYNE M. SYRACUSE (54)    Trustee      Term expires        Private Investor; Managing  2          Trustee (since 2007),
                            (since 2007)     2011            Director (2000- 2007), JP              MassMutual Corporation
MassMutual                                                   Morgan Securities, Inc.                Investors (a closed-end
Participation Investors                                      (investments and banking)              investment company advised by
1500 Main Street                                                                                    Babson Capital) ; Managing
P.O. Box 15189                                                                                      Director (1984- 2000),
Springfield, MA 01115-5189                                                                          Deutsche Bank/Bankers Trust
                                                                                                    Company.
--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            51


OFFICERS OF THE TRUST

                                                                PRINCIPAL
                              POSITION                          OCCUPATIONS
NAME (AGE),                   WITH          OFFICE TERM/LENGTH  DURING PAST
ADDRESS                       THE TRUST     OF TIME SERVED      5 YEARS
----------------------------------------------------------------------------------------------------------------------------
                                                       
MICHAEL L. KLOFAS (50)        President     Since 2009          President (since 2009), Vice President (1998-2009) of the
                                                                Trust; Managing Director (since 2000), Babson Capital;
MassMutual                                                      President (since 2009), Vice President (2005-2009), MMCI
Participation Investors                                         Subsidiary Trust and MMPI Subsidiary Trust; President (since
1500 Main Street                                                2009), Vice President (1998-2009), MassMutual Corporate
P.O. Box 15189                                                  Investors.
Springfield, MA 01115-5189


CHRISTOPHER A. DEFRANCIS (44)      Vice     Since 2010          Vice President and Secretary (since 2010) and Associate
                                President                       Secretary (2008-2010) of the Trust; Co-General Counsel,
MassMutual                    and Secretary                     Secretary and Managing Director (since 2010), Senior
Participation Investors                                         Counsel, Assistant Secretary and Managing Director (2010)
1500 Main Street                                                and Assistant Secretary and Counsel (2008-2009), Babson
P.O. Box 15189                                                  Capital; Counsel (2001-2009), Massachusetts Mutual Life
Springfield, MA 01115-5189                                      Insurance Company; Vice President and Secretary (since 2010)
                                                                and Assistant Secretary (2009-2010), MMCI Subsidiary Trust
                                                                and MMPI Subsidiary Trust; and Vice President and Secretary
                                                                (since 2010) and Associate Secretary (2008-2010), MassMutual
                                                                Corporate Investors.


JAMES M. ROY (48)                Vice       Since 2005          Vice President and Chief Financial Officer (since 2005),
                              President                         Treasurer (2003-2005), and Associate Treasurer (1999-2003)
MassMutual                    and Chief                         of the Trust; Managing Director (since 2005), and Director
Participation Investors       Financial                         (2000-2005) of Babson Capital; Trustee (since 2005),
1500 Main Street               Officer                          Treasurer (since 2005), and Controller (2003-2005), MMCI
P.O. Box 15189                                                  Subsidiary Trust and MMPI Subsidiary Trust; and Vice
Springfield, MA 01115-5189                                      President and Chief Financial Officer (since 2005),
                                                                Treasurer (2003-2005) and Associate Treasurer (1999-2003),
                                                                MassMutual Corporate Investors.


JOHN T. DAVITT, JR. (43)      Comptroller   Since 2001          Comptroller (since 2001) of the Trust; Director (since 2000)
                                                                of Babson Capital; Controller (since 2005), MMCI Subsidiary
MassMutual                                                      Trust and MMPI Subsidiary Trust; and Comptroller (since
Participation Investors                                         2001), MassMutual Corporate Investors.
1500 Main Street
P.O. Box 15189
Springfield, MA 01115-5189


MELISSA M. LAGRANT (37)           Chief     Since 2006          Chief Compliance Officer (since 2006) of the Trust; Managing
                                Compliance                      Director (since 2005) of Babson Capital; Vice President and
MassMutual                       Officer                        Senior Compliance Trading Manager (2003-2005), Loomis,
Participation Investors                                         Sayles & Company, L.P.; Assistant Vice President-Business
1500 Main Street                                                Risk Management Group (2002-2003), and Assistant Vice
P.O. Box 15189                                                  President-Investment Compliance (2001-2002), Zurich Scudder
Springfield, MA 01115-5189                                      Investments/Deutsche Asset Management; and Chief Compliance
                                                                Officer (since 2006), MassMutual Corporate Investors.


DANIEL J. FLORENCE (38)         Treasurer   Since 2008          Treasurer (since 2008) and Associate Treasurer (2006-2008)
                                                                of the Trust; Associate Director (since 2008), Analyst
MassMutual                                                      (2000-2008) of Babson Capital; and Treasurer (since 2008)
Participation Investors                                         and Associate Treasurer (2006-2008), MassMutual Corporate
1500 Main Street                                                Investors.
P.O. Box 15189
Springfield, MA 01115-5189

--------------------------------------------------------------------------------
52           MassMutual Participation Investors 2010 ANNUAL REPORT



MEMBERS OF THE BOARD OF
TRUSTEES
                                    
LEFT TO RIGHT:                         DIVIDEND REINVESTMENT AND CASH PURCHASE PLAN

Donald Glickman                        MassMutual Participation Investors offers a Dividend
Chairman,                              Reinvestment and Cash Purchase Plan. The Plan provides a
Donald Glickman & Company, Inc.        simple and automatic way for shareholders to add to their
                                       holdings in the Trust through the receipt of dividend shares
Robert E. Joyal                        issued by the Trust or through the reinvestment of cash
Retired President,                     dividends in Trust shares purchased in the open market. The
Babson Capital Management LLC          dividends of each shareholder will be automatically
                                       reinvested in the Trust by Shareholder Financial Services
William J. Barrett                     Inc., the Transfer Agent, in accordance with the Plan,
President,                             unless such shareholder elects not to participate by
W J Barrett Associates, Inc.           providing written notice to the Transfer Agent. A
                                       shareholder may terminate his or her participation by
Michael H. Brown*                      notifying the Transfer Agent in writing.
Private Investor
                                       Participating shareholders may also make additional
Donald E. Benson*                      contributions to the Plan from their own funds. Such
Executive Vice President               contributions may be made by personal check or other means
and Director,                          in an amount not less than $100 nor more than $5,000 per
Marquette Financial Companies          quarter. Cash contributions must be received by the Transfer
                                       Agent at least five days (but no more then 30 days) before
Dr. Corine T. Norgaard*                the payment date of a dividend or distribution.
President,
Retirement Options                     Whenever the Trust declares a dividend payable in cash or
                                       shares, the Transfer Agent, acting on behalf of each
Clifford M. Noreen                     participating shareholder, will take the dividend in shares
President,                             only if the net asset value is lower than the market price
Babson Capital Management LLC          plus an estimated brokerage commission as of the close of
                                       business on the valuation day. The valuation day is the last
Martin T. Hart                         day preceding the day of dividend payment. When the dividend
Private Investor                       is to be taken in shares, the number of shares to be
                                       received is determined by dividing the cash dividend by the
Maleyne M. Syracuse                    net asset value as of the close of business on the valuation
Private Investor                       date or, if greater than net asset value, 95% of the closing
                                       share price. If the net asset value of the shares is higher
*Member of the Audit Committee         than the market value plus an estimated commission, the
                                       Transfer Agent, consistent with obtaining the best price and
                                       execution, will buy shares on the open market at current
                                       prices promptly after the dividend payment date.

                                       The reinvestment of dividends does not, in any way, relieve
OFFICERS                               participating shareholders of any federal, state or local
                                       tax. For federal income tax purposes, the amount reportable
Clifford M. Noreen                     in respect of a dividend received in newly-issued shares of
Chairman                               the Trust will be the fair market value of the shares
                                       received, which will be reportable as ordinary income and/or
Michael L. Klofas                      capital gains.
President
                                       As compensation for its services, the Transfer Agent
James M. Roy                           receives a fee of 5% of any dividend and cash contribution
Vice President & Chief                 (in no event in excess of $2.50 per distribution per
Financial Officer                      shareholder.)

Christopher A. DeFrancis               Any questions regarding the Plan should be addressed to
Vice President                         Shareholder Financial Services, Inc., Agent for MassMutual
& Secretary                            Participation Investors' Dividend Reinvestment and Cash
                                       Purchase Plan, P.O. Box 173673, Denver, CO 80217-3673.
Jill A. Fields
Vice President

Michael P. Hermsen
Vice President

Mary Wilson Kibbe
Vice President

Richard E. Spencer, II
Vice President

Daniel J. Florence
Treasurer

John T. Davitt, Jr.
Comptroller

Melissa M. LaGrant
Chief Compliance Officer


--------------------------------------------------------------------------------
             MassMutual Participation Investors 2010 ANNUAL REPORT            53







[LOGO]  MASSMUTUAL PARTICIPATION INVESTORS
        2010 ANNUAL REPORT

























                                                                          PI5511

ITEM 2.  CODE OF ETHICS.

         The Registrant adopted a Code of Ethics for Senior Financial Officers
(the "Code") on October 17, 2003, which is available on the Registrant's website
at www.babsoncapital.com/mpv. During the period covered by this Form N-CSR,
there were no amendments to, or waivers from, the Code.

ITEM 3.  AUDIT COMMITTEE FINANCIAL EXPERT.

         The Registrant's Board of Trustees has determined that Mr. Donald E.
Benson, a Trustee of the Registrant and a member of its Audit Committee, is an
audit committee financial expert. Mr. Benson is "independent" for purposes of
this Item 3 as required by applicable regulation.

ITEM 4.  PRINCIPAL ACCOUNTANT FEES AND SERVICES.

         Fees Billed to the Registrant

                                  KPMG LLP                KPMG LLP
                                 Year Ended              Year Ended
                                 December 31,            December 31,
                                     2010                    2009
                                -------------           -------------
         Audit Fees             $      52,500           $      50,000
         Audit-Related Fees                 0                       0
         Tax Fees                      44,100                  42,000
         All Other Fees                     0                       0
                                -------------           -------------
         Total Fees             $      96,600           $      92,000
                                =============           =============

         Non-Audit Fees Billed to Babson Capital and MassMutual

                                  KPMG LLP                KPMG LLP
                                 Year Ended              Year Ended
                                 December 31,            December 31,
                                     2010                    2009
                                -------------           -------------
         Audit-Related Fees     $     937,100           $   1,108,792
         Tax Fees                      47,100                  25,500
         All Other Fees                     0                       0
                                -------------           -------------
         Total Fees             $     984,200           $   1,134,292
                                =============           =============

         The category "Audit-Related Fees" reflects fees billed by KPMG for
various non-audit and non-tax services rendered to the Registrant, Babson
Capital Management LLC ("Babson Capital"), and Massachusetts Mutual Life
Insurance Company ("MassMutual"), such as SAS 70 review, IFRS consulting and
agreed upon procedures reports. Preparation of Federal, state and local income
tax returns and tax compliance work are representative of the fees reported in
the "Tax Fees" category. The category "All Other Fees" represents fees billed by
KPMG for consulting rendered to Babson Capital and MassMutual. The
Sarbanes-Oxley Act of 2002 and its implementing regulations allows the
Registrant's Audit Committee to establish a pre-approval policy for certain
services rendered by the Registrant's independent accountants. During 2009, the
Registrant's Audit Committee approved all of the services rendered to the
Registrant by KPMG and did not rely on such a pre-approval policy for any such
services.

         The Audit Committee has also reviewed the aggregate fees billed for
professional services rendered by KPMG for 2009 and 2010 for the Registrant and
for the non-audit services provided to Babson Capital, and Babson Capital's
parent, MassMutual. As part of this review, the Audit Committee considered
whether the provision of such non-audit services was compatible with maintaining
the principal accountant's independence.

         The 2009 fees billed represent final 2009 amounts, which may differ
from the preliminary figures available as of the filing date of the Registrant's
2010 Annual Form N-CSR and includes, among other things, fees for services that
may not have been billed as of the filing date of the Registrant's 2010 Annual
Form N-CSR, but are now properly included in the 2009 fees billed to the
Registrant, Babson Capital and MassMutual.

ITEM 5.  AUDIT COMMITTEE OF LISTED REGISTRANTS.

         The Registrant maintains an Audit Committee composed exclusively of
Trustees of the Registrant who qualify as "independent" Trustees under the
current listing standards of the New York Stock Exchange and the rules of the
U.S. Securities and Exchange Commission. The Audit Committee operates pursuant
to a written Audit Committee Charter, which is available (1) on the Registrant's
website, www.babsoncapital.com/mpv; and (2) without charge, upon request, by
calling, toll-free 866-399-1516. The current members of the Audit Committee are
Donald E. Benson, Michael H. Brown and Corine T. Norgaard.

ITEM 6.  SCHEDULE OF INVESTMENTS

         A schedule of investments for the Registrant is included as part of
this report to shareholders under Item 1 of this Form N-CSR.

ITEM 7.  DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
         MANAGEMENT INVESTMENT COMPANIES.

         The Registrant's Board of Trustees has delegated proxy voting
responsibilities relating to voting securities held by the Registrant to its
investment adviser, Babson Capital Management LLC ("Babson Capital"). A summary
of Babson Capital's proxy voting policies and procedures is set forth below.

Summary of Babson Capital's Proxy Voting Policy
-----------------------------------------------

         Babson Capital views the voting of proxies as an integral part of its
investment management responsibility and believes, as a general principle, that
proxies should be acted upon (voted or abstained) solely in the best interest of
its clients (i.e. in a manner it believes is most likely to enhance the economic
value of the underlying securities held in client accounts). To implement this
general principle, Babson Capital has engaged a proxy service provider (the
"Service Provider"). The Service Provider is responsible for processing and
maintaining records of proxy votes. In addition, the Service Provider has
retained the services of an independent third party research provider (the
"Research Provider") to provide research and recommendations on proxy voting. It
is Babson Capital's Proxy Voting Policy to generally vote proxies in accordance
with the recommendations of the Research Provider, or, in cases where the
Research Provider has not made any recommendations with respect to a proxy, in
accordance with the Research Provider's proxy voting guidelines (the
"Guidelines"). If a proxy involves an issue on which the Research Provider has
not made a recommendation or has not addressed in the Guidelines, it will be
analyzed on a case-by-case basis.

         Babson Capital recognizes, however, that there may be times when Babson
Capital determines that it may be in the best interest of clients holding the
securities to (1) vote against the Research Provider's recommendations or (2) in
cases where the Research Provider has not provided Babson Capital with any
recommendations with respect to a proxy, vote against the Research Provider's
Guidelines. Babson Capital may vote, in whole or in part, against the Research
Provider's recommendations or the Research Provider's Guidelines, as applicable.
The procedures set forth in the Proxy Voting Policy are designed to ensure that
votes against the Research Provider's recommendations or Guidelines have been
made in the best interest of clients and are not the result of any material
conflict on interest (a "Material Conflict"). For purposes of the Proxy Voting
Policy, a Material Conflict shall mean any position, relationship or interest,
financial or otherwise, of Babson Capital (or any person authorized under the
Proxy Voting Policy to vote proxies on behalf of Babson Capital) that would or
could reasonably be expected to affect Babson Capital's (or such person's)
independence or judgment concerning how to vote proxies.

Summary of Babson Capital's Proxy Voting Procedures
---------------------------------------------------

         Babson Capital will vote all client proxies for which it has proxy
voting discretion in accordance with the Research Provider's recommendations or
Guidelines, unless (i) a person authorized by the Best Execution and Proxy
Committee (each a "Proxy Analyst"), the Best Execution and Proxy Committee or a
designated member of the Best Execution and Proxy Committee, as applicable,
determines that it is in the client's best interest to vote against the Research
Provider's recommendation or Guidelines or (ii) Babson Capital is unable or
determines not to vote a proxy in accordance with the Proxy Voting Policy. In
these cases: if (i) a Proxy Analyst recommends that a proxy should be voted
against the Research Provider's recommendation or Guidelines, (ii) no other
Proxy Analyst reviewing such proxy disagrees with such recommendation, and (iii)
no known Material Conflict is identified by the Proxy Analyst(s) or the Proxy
Administrator, the Proxy Administrator will vote the proxy or post the proxy for
voting in accordance with the Proxy Analyst's recommendation. Otherwise, the
proxy is to be submitted to a member of the Best Execution and Proxy Committee,
who shall determine how to vote the proxy unless (i) the Proxy Analyst or Proxy
Administrator has identified a Babson Capital Material Conflict or (ii) said
Best Execution and Proxy Committee member has identified a Material Conflict
personal to him or herself or a Babson Capital Material Conflict. In such cases,
the proxy shall be submitted to the Bet Execution and Proxy Committee, which may
authorize a vote against the Research Provider's recommendation or Guidelines
only if the Best Execution and Proxy Committee determines that such vote is in
the client's best interests.

         Nothing herein shall preclude Babson Capital from splitting a vote
among different advisory clients in those cases where Babson Capital deems it
appropriate.

         No associate, officer, director or board of managers member of Babson
Capital or its affiliates (other than those assigned such responsibilities under
the Proxy Voting Policy) may influence how Babson Capital votes client proxies,
unless such person has been requested to provide such assistance by a Proxy
Analyst or Best Execution and Proxy Committee member and has disclosed any know
Material Conflict. Any pre-vote communications prohibited by the Proxy Voting
Policy shall be reported to a Best Execution and Proxy Committee member prior to
voting and to Babson Capital's Chief Compliance Officer or General Counsel.

Obtaining a Copy of the Proxy Voting Policy
-------------------------------------------

         Clients may obtain a copy of Babson Capital's Proxy Voting Policy and
information about how Babson Capital voted proxies related to their securities,
free of charge, by contacting the Chief Compliance Officer, Babson Capital
Management LLC, Independence Wharf, 470 Atlantic Avenue, Boston, MA 02210, or
calling toll-free, 1-877-766-0014.

ITEM 8.  PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

         The following disclosure item is made as of the date of this Form N-CSR
unless otherwise indicated.

         PORTFOLIO MANAGER. Michael L. Klofas serves as the President of the
Registrant (since 2009) and as one of its Portfolio Managers. Mr. Klofas began
his service to the Registrant in 1998 as a Vice President. With over 25 years of
industry experience, Mr. Klofas is a Managing Director of the Mezzanine and
Private Equity Group of Babson Capital Management LLC ("Babson Capital"). Mr.
Klofas joined MassMutual in 1988. Prior to joining MassMutual, he spent two
years at a small venture capital firm and two years at a national public
accounting firm. At MassMutual and then Babson Capital, Mr. Klofas has analyzed
and invested in traditional private placements and high yield public bonds. He
also spent four years leading Babson Capital's workout and restructuring
activities. Since 1993, he has focused on originating, analyzing, structuring
and documenting mezzanine and private equity investments. Mr. Klofas holds a
B.A. from Brandeis University and an M.B.A. from Babson College as well as a
Certified Public Accountant designation. Mr. Klofas also presently serves as
President of MassMutual Participation Investors, another closed-end management
investment company advised by Babson Capital.

         PORTFOLIO MANAGEMENT TEAM. Mr. Klofas has primary responsibility for
overseeing the investment of the Registrant's portfolio, with the day-to-day
investment management responsibility of the Registrant's portfolio being shared
with the following Babson Capital investment professionals (together with the
Portfolio Manager, the "Portfolio Team").

         Michael P. Hermsen is a Vice President of the Registrant and a Managing
Director of Babson Capital who oversees the Private Finance Group and manages
Babson Capital's Mezzanine Investment and Private Equity Investments Team which
is responsible for finding, analyzing, negotiating and servicing mezzanine
private placement securities for the Registrant.

         Mr. Hermsen joined MassMutual in 1990 and has been an officer of the
Registrant since 1998. Previously, he worked at Teachers Insurance and Annuity
Association where he was a generalist private placement analyst. At MassMutual
and then Babson Capital, Mr. Hermsen has analyzed and invested in traditional
private placements, high yield public and private bonds, and leveraged bank
loans. He has also been responsible for managing a small portfolio of distressed
investments. Since 1993, he has focused on originating, analyzing, structuring
and documenting mezzanine and private equity investments. He holds a B.A. from
Bowdoin College and an M.B.A. from Columbia University.

         Mr. Spencer is a Vice President of the Registrant and a Managing
Director of Babson Capital who also manages Babson Capital's Mezzanine and
Private Equity Investments Team. Mr. Spencer joined MassMutual in 1989 after
three years as a corporate loan analyst at a major New England bank. He has been
an officer of the Registrant since 2002. At MassMutual and then Babson Capital,
Mr. Spencer has analyzed and invested in traditional private placements, high
yield public and private bonds, leveraged bank loans, mezzanine debt and private
equity. From 1993 to 1999, he was the lead restructuring professional at Babson
Capital. Since 1999, Mr. Spencer has been focused on the origination, analysis,
structuring and documentation of mezzanine and private equity investments. He
holds a B.A. from Bucknell University and an M.B.A. from the State University of
New York at Buffalo.

         Jill A. Fields is responsible for the day-to-day management of the
Registrant's public high yield and investment grade fixed income portfolio. Ms.
Fields has been a Vice President of the Registrant since 2006. Ms. Fields is a
Managing Director of Babson Capital with over 20 years of industry experience in
high yield total return structured credit leveraged loans and private placement
investing. Prior to joining Babson Capital in 1997, she was a credit analyst at
Shawmut National Bank, and the Director of Corporate Bond Research at Hartford
Life Insurance Group. Ms. Fields holds a B.S. from Pennsylvania State University
and an M.B.A. from the University of Connecticut.

         OTHER ACCOUNTS MANAGED BY THE PORTFOLIO TEAM. The members of the
Registrant's portfolio Team also have primary responsibility for the day-to-day
management of other Babson Capital advisory accounts, including, among others,
closed-end and open-end investment companies, private investment funds,
MassMutual-affiliated accounts, as well as separate accounts for institutional
clients. These advisory accounts are identified below.

                                              NUMBER OF
                                              ACCOUNTS          APPROXIMATE
                                  TOTAL       WITH              ASSET SIZE OF
                                  NUMBER      APPROXIMATE       PERFORMANCE-    PERFORMANCE-
PORTFOLIO         ACCOUNT         OF          TOTAL ASSET       BASED           BASED ADVISORY
TEAM              CATEGORY        ACCOUNTS    SIZE (A)          ADVISORY FEE    FEE ACCOUNTS (A)
--------------    --------        --------    --------------    ------------    ----------------
                                                                 
                  Registered
Clifford M.       Investment
Noreen (B)        Companies          1        $237.6 million         0          N/A
                  ------------------------------------------------------------------------------
                  Other Pooled
                  Investment
                  Vehicles           1        $4.3 million           1          $4.3 million
                  ------------------------------------------------------------------------------
                  Other
                  Accounts           0        N/A                    0          N/A
                  ------------------------------------------------------------------------------
                  Registered
Jill A.           Investment
Fields            Companies          4        $518.5 million         0          N/A
                  ------------------------------------------------------------------------------
                  Other Pooled
                  Investment
                  Vehicles           1        $45 million            1          $45 million
                  ------------------------------------------------------------------------------
                  Other
                  Accounts (C)       5        $597.3 million         0          N/A
                  ------------------------------------------------------------------------------
                  Registered
Michael P.        Investment
Hermsen           Companies          1        $237.6 million         0          N/A
                  ------------------------------------------------------------------------------
                  Other Pooled
                  Investment
                  Vehicles (D)       5        $1 billion             5          $1 billion
                  ------------------------------------------------------------------------------
                  Other
                  Accounts           0        N/A                    0          N/A
                  ------------------------------------------------------------------------------



                                              NUMBER OF
                                              ACCOUNTS          APPROXIMATE
                                  TOTAL       WITH              ASSET SIZE OF
                                  NUMBER      APPROXIMATE       PERFORMANCE-    PERFORMANCE-
PORTFOLIO         ACCOUNT         OF          TOTAL ASSET       BASED           BASED ADVISORY
TEAM              CATEGORY        ACCOUNTS    SIZE (A)          ADVISORY FEE    FEE ACCOUNTS (A)
--------------    --------        --------    --------------    ------------    ----------------
                                                                 
                  Registered
Michael L.        Investment
Klofas            Companies          1        $237.6 million         0          N/A
                  ------------------------------------------------------------------------------
                  Other Pooled
                  Investment
                  Vehicles (D)       5        $1 billion             5          $1 billion
                  ------------------------------------------------------------------------------
                  Other
                  Accounts           0        N/A                    0          N/A
                  ------------------------------------------------------------------------------
                  Registered
Richard E.        Investment
Spencer, II       Companies          1        $237.6 million         0          N/A
                  ------------------------------------------------------------------------------
                  Other Pooled
                  Investment
                  Vehicles (D)       5        $1 billion             5          $1 billion
                  ------------------------------------------------------------------------------
                  Other
                  Accounts           0        N/A                    0          N/A

(A)      Account asset size has been calculated as of December 31, 2010.

(B)      Mr. Noreen, as head of Babson Capital's Fixed Income Group, has overall
         responsibility for all corporate credit related investments, including
         public and private bonds, as well as structured credit products managed
         by Babson Capital. Except for the accounts noted in the table above,
         Mr. Noreen is not primarily responsible for the day-to-day management
         of the other accounts managed by Babson Capital's Fixed Income Group.

(C)      Ms. Fields manages the high yield sector of the general investment
         account of Massachusetts Mutual Life Insurance Company and C.M. Life
         Insurance Company; however these assets are not represented in the
         table above.

(D)      Messrs. Hermsen, Klofas and Spencer manage private placement mezzanine
         debt securities for the general investment account of Massachusetts
         Mutual Life Insurance Company and C.M. Life Insurance Company; however
         these assets are not represented in the table above.

         MATERIAL CONFLICTS OF INTEREST. The potential for material conflicts of
interest may exist as the members of the Portfolio Team have responsibilities
for the day-to-day management of multiple advisory accounts. These conflicts may
be heightened to the extent the individual, Babson Capital and/or an affiliate
has an investment in one or more of such accounts or an interest in the
performance of one or more of such accounts. Babson Capital has identified (and
summarized below) areas where material conflicts of interest are most likely to
arise, and has adopted polices and procedures that it believes are reasonably
designed to address such conflicts.

         Babson Capital or its affiliates, including MassMutual and its
affiliates, may from time to time, acting as principal, buy securities or other
investments for itself from or sell securities or other investments it owns to
its advisory clients. Likewise, Babson Capital may either directly or on behalf
of MassMutual, purchase and/or hold securities or other investments that are
subsequently sold or transferred to advisory clients. Babson Capital has a
conflict of interest in connection with a transaction where it or an affiliate
is acting as principal since it may have an incentive to favor itself or its
affiliates over its advisory clients in connection with the transaction. To
address these conflicts of interest, Babson Capital has adopted certain policies
and procedures, including but not limited to policies and procedures on
transactions with affiliates. Any such transaction will be consistent with
Babson Capital's fiduciary obligation to act in the best interests of its
clients, including its ability to obtain best execution in connection with the
transaction, and will be in compliance with applicable legal and regulatory
requirements.

         Babson Capital may effect cross-trades on behalf of its advisory
clients whereby one advisory client buys securities or other investments from or
sells securities or other investments to another advisory client. Babson Capital
may also effect cross-transactions involving advisory accounts or funds in which
it or its affiliates, including MassMutual, and their respective employees, have
an ownership interest or for which Babson Capital is entitled to earn a
performance or incentive fee. As a result, Babson Capital has a conflict of
interest in connection with the cross-transaction since it may have an incentive
to favor the advisory client or fund in which it or its affiliate has an
ownership interest and/or is entitled to a performance or incentive fee. To
address these conflicts of interest, Babson Capital has adopted certain policies
and procedures, including but not limited to policies and procedures on
transactions with affiliates. Any such cross-transaction will be consistent with
Babson Capital's fiduciary obligation to act in the best interests of each of
its advisory clients, including its ability to obtain best execution for each
advisory client in connection with the cross-trade transaction, and will be in
compliance with applicable legal and regulatory requirements. Babson Capital
will not receive a commission or any other remuneration (other than its advisory
fee) for effecting cross-transactions between advisory clients.

         Babson Capital may invest client assets in securities or other
investments that are also held by (i) Babson Capital or its affiliates,
including MassMutual, (ii) other Babson Capital advisory accounts, (iii) funds
or accounts in which Babson Capital or its affiliates or their respective
employees have an ownership or economic interest or (iv) employees of Babson
Capital or its affiliates. Babson Capital may also, on behalf of its advisory
clients, invest in the same or different securities or instruments of issuers in
which (i) Babson Capital or its affiliates, including MassMutual, (ii) other
Babson Capital advisory accounts, (iii) funds or accounts in which Babson
Capital, its affiliates, or their respective employees have an ownership or
economic interest or (iv) employees of Babson Capital or its affiliates, have an
ownership interest as a holder of the debt, equity or other instruments of the
issuer. Babson Capital has a conflict of interest in connection with any such
transaction since investments by its advisory clients may directly or indirectly
benefit Babson Capital and/or its affiliates and employees by potentially
increasing the value of the securities or instruments it holds in the issuer.
Any investment by Babson Capital on behalf of its advisory clients will be
consistent with its fiduciary obligations to act in the best interests of its
advisory clients, and otherwise be consistent with such clients' investment
objectives and restrictions.

         Babson Capital or its affiliates may also recommend that clients invest
in registered or unregistered investment companies, including private investment
funds such as hedge funds, private equity funds or structured funds, (i) advised
by Babson Capital or an affiliate, (ii) in which Babson Capital, an affiliate or
their respective employees has an ownership or economic interest or (iii) with
respect to which Babson Capital or an affiliate has an interest in the entity
entitled to receive the fees paid by such funds. Babson Capital has a conflict
of interest in connection with any such recommendation since it may have an
incentive to base its recommendation to invest in such investment companies or
private funds on the fees that Babson Capital or its affiliates would earn as a
result of the investment by its advisory clients in the investment companies or
private funds. Any recommendation to invest in a Babson Capital advised fund or
other investment company will be consistent with Babson Capital's fiduciary
obligations to act in the best interests of its advisory clients, consistent
with such clients' investment objectives and restrictions. Babson Capital may,
in certain limited circumstances, offer to clients that invest in private
investment funds that it advises an equity interest in entities that receive
advisory fees and carried profits interest from such funds.

         Babson Capital may permit certain of its portfolio managers and other
employees to invest in private investment funds advised by Babson Capital or its
affiliates and/or share in the performance or incentive fees received by Babson
Capital from such funds. If the portfolio manager or other employee was
responsible for both the portfolio management of the private fund and other
Babson Capital advisory accounts, such person would have a conflict of interest
in connection with investment decisions since the person may have an incentive
to direct the best investment ideas, or to allocate trades, in favor of the fund
in which he or she is invested or otherwise entitled to share in the performance
or incentive fees received from such fund. To address these conflicts of
interest, Babson Capital has adopted a policy governing side by side management
of private investment funds and other advisory accounts, which policy requires,
among others things, that Babson Capital treat each of its advisory clients in a
manner consistent with its fiduciary obligations and prohibits Babson Capital
from favoring any particular advisory account as a result of the ownership or
economic interests of Babson Capital, its affiliates or employees, in such
advisory account. Any investment by a Babson Capital employee in one of its
private funds is also governed by Babson Capital's employee co-investment
policy.

         As noted above, Babson Capital's portfolio managers are often
responsible for the day-to-day management of multiple accounts, including, among
others, separate accounts for institutional clients, closed-end and open-end
registered investment companies, and/or private investment funds (such as hedge
funds, private equity fund, and structured funds), as well as for proprietary
accounts of Babson Capital and its affiliates, including MassMutual and its
affiliates. The potential for material conflicts of interest exist whenever a
portfolio manager has responsibility for the day-to-day management of multiple
advisory accounts. These conflicts may be heightened to the extent a portfolio
manager is responsible for managing a proprietary account for Babson Capital or
its affiliates or where the portfolio manager, Babson Capital and/or an
affiliate has an investment in one or more of such accounts or an interest in
the performance of one or more of such accounts (e.g., through the receipt of a
performance or incentive fee).

         Such potential conflicts include those relating to allocation of
investment opportunities. For example, it is possible that an investment
opportunity may be suitable for more than one account managed by Babson Capital,
but may not be available in sufficient quantities for all accounts to
participate fully. Similarly, there may be limited opportunity to sell an
investment held by multiple accounts. A conflict arises where the portfolio
manager has an incentive to treat an account preferentially because the account
pays Babson Capital or its affiliates a performance-based fee or the portfolio
manager, Babson Capital or an affiliate has an ownership or other economic
interest in the account. As noted above, Babson Capital also acts as an
investment manager for certain of its affiliates, including MassMutual. These
affiliate accounts co-invest jointly and concurrently with Babson Capital's
other advisory clients and therefore share in the allocation of such investment
opportunities. To address these conflicts of interest associated with the
allocation of trading and investment opportunities, Babson Capital has adopted
an investment allocation policy and trade allocation procedures that govern the
allocation of portfolio transactions and investment opportunities across
multiple advisory accounts, including affiliated accounts. In addition, as noted
above, to address these conflicts of interest, Babson Capital has adopted a
policy governing side-by-side management of private investment funds and other
advisory accounts, which policy requires, among others things, that Babson
Capital treat each of its advisory clients in a manner consistent with its
fiduciary obligations and prohibits Babson Capital from favoring any particular
advisory account as a result of the ownership or economic interests of Babson
Capital, its affiliates or employees, in such advisory accounts. Any investment
by a Babson Capital employee in one of its private funds is also governed by
Babson Capital's employee co-investment policy.

         Potential material conflicts of interest may also arise related to the
knowledge and timing of an account's trades, investment opportunities and broker
selection. Babson Capital and its portfolio managers have information about the
size, timing and possible market impact of the trades of each account they
manage. It is possible that portfolio managers could use this information for
their personal advantage and/or the advantage or disadvantage of various
accounts which they manage. For example, a portfolio manager could, or cause a
favored account to, "front run" an account's trade or sell short a security for
an account immediately prior to another accounts sale of that security. To
address these conflicts, Babson Capital has adopted policies and procedures and
a Code of Ethics governing employees' personal securities transactions, the use
of short sales, and side-by-side management of private investment funds and
other advisory accounts.

         Potential material conflicts of interest may also arise if a trade
error occurs in a client account. A trade error is deemed to occur if there is a
deviation by Babson Capital from the applicable standard of care in connection
with the placement, execution or settlement of a trade for an advisory account
that results in (1) Babson Capital purchasing securities not permitted or
authorized by a client's investment advisory agreement or otherwise failing to
follow a client's specific investment directives; (2) Babson Capital purchasing
or selling the wrong security or the wrong amount of securities on behalf of a
client's account; or (3) Babson Capital purchasing or selling securities for, or
allocating securities to, the wrong client account. When correcting these
errors, conflicts of interest between Babson Capital and its advisory accounts
may arise as decisions are made on whether to cancel, reverse or reallocate the
erroneous trades. In order to address these conflicts, Babson Capital has
adopted policies and procedures governing the resolution of trading errors, and
will follow these policies and procedures in order to ensure that trade errors
are handled promptly and appropriately and that no client account is harmed by
an erroneous trade.

         With respect to securities transactions for most of the accounts it
manages, Babson Capital determines which broker to use to execute each order,
consistent with its fiduciary duty to seek best execution of the transaction.
Babson Capital manages certain accounts, however, for clients who limit its
discretion with respect to the selection of brokers or direct it to execute such
client's transaction through a particular broker. In these cases, trades for
such an account in a particular security may be placed separately from, rather
than aggregated with, those in the same security for other accounts. Placing
separate transaction orders for a security may temporarily affect the market
price of the security or otherwise affect the execution of the transaction to
the possible detriment of one or more of the other account(s) involved. Babson
Capital has policies and procedures that address best execution and directed
brokerage arrangements.

         Babson Capital and its portfolio managers or employees may have other
actual or potential conflicts of interest in managing an advisory account, and
the list above is not a complete description of every conflict of interest that
could be deemed to exist.

         COMPENSATION. The current Babson Capital compensation and incentive
program for investment professionals is designed to attract, motivate and retain
high-performing individuals.

         To help Babson Capital make informed decisions, Babson Capital
participates in annual compensation surveys of investment management firms using
McLagan Partners, in addition to other industry specific resources. The firms
selected for periodic peer-group comparisons typically have similar asset size
or business mix. Annually, a review is conducted of total compensation versus
market, to ensure that individual pay is competitive with the defined overall
market.

         The compensation package for the members of the Portfolio Team is
comprised of a market-driven base salary, a performance-driven annual bonus, and
discretionary long-term incentives. The performance-driven bonus is based on the
performance of the accounts managed by the members of the Portfolio Team
relative to appropriate benchmarks, including with respect to the Registrant, to
the Russell 2000 Index and Lehman Brothers U.S. Corporate High Yield Index.
Performance of the Registrant, like other accounts Portfolio Team members
manage, are evaluated on a pre-tax basis, and are reviewed over one and
three-year periods, with greater emphasis given to the latter. There are other
factors that affect bonus awards to a lesser extent, such as client
satisfaction, teamwork, the assets under management, and the overall success of
Babson Capital. Such factors are considered as a part of the overall annual
bonus evaluation process by the management of Babson Capital.

         Long-Term incentives are designed to share with participants the
longer-term value created in Babson Capital. Long-term incentives may take the
form of deferred cash awards (including deferred cash awards that provide a
portfolio manager with the economic equivalent of a "shareholder" interest in
Babson Capital by linking the value of the award to a formula which ties to the
value of the business), and/or, in the case of a portfolio manager who manages a
private investment fund with a performance fee, a deferred cash award or a
direct profit sharing interest that results in the portfolio manager receiving
amounts based on the amount of the performance fee paid by such fund. These
long-term incentives vest over time and are granted annually, based upon the
same criteria used to determine the performance-driven annual bonus detailed
above. Because the Portfolio Team members are generally responsible for multiple
accounts (including the Registrant), they are compensated on the overall
performance of the accounts that they manage, rather than a specific account,
except for the portion of compensation relating to any performance fee award.

         BENEFICIAL OWNERSHIP. As of December 31, 2010, members of the Portfolio
Team beneficially owned the following dollar range of equity securities in the
Registrant:

                                     Dollar Range of Beneficially
         Portfolio Team:             Owned* Equity Securities of the Registrant:
         ---------------             -------------------------------------------
         Clifford M. Noreen          None
         Jill A. Fields              None
         Michael P. Hermsen          $10,001-$50,000
         Michael L. Klofas           None
         Richard E. Spencer II       None

* Beneficial ownership has been determined in accordance with Rule 16a-1(a)(2)
  under the Securities Exchange Act of 1934, as amended. (Shares "beneficially
  owned" include the number of shares of the Registrant represented by the value
  of a Registrant-related investment option under Babson Capital's non-qualified
  deferred compensation plan for certain officers of Babson Capital (the
  "Plan").  The Plan has an investment option that derives its value from the
  market value of the Registrant's shares. However, neither the Plan nor the
  participation in the Plan has an actual ownership interest in the Registrant's
  shares.)

ITEM 9.  PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT
         COMPANY AND AFFILIATED PURCHASERS.

         Not applicable for this filing.

ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

         Not applicable for this filing.


ITEM 11. CONTROLS AND PROCEDURES.

         (a)   The principal executive officer and principal financial officer
               of the Registrant evaluated the effectiveness of the Registrant's
               disclosure controls and procedures (as defined in Rule 30a-3(c)
               under the Investment Company Act of 1940 (the "Act")) as of a
               date within 90 days of the filing date of this report and based
               on that evaluation have concluded that such disclosure controls
               and procedures are effective to provide reasonable assurance that
               material information required to be disclosed by the Registrant
               on Form N-CSR is recorded, processed, summarized and reported
               within the time periods specified in the Securities and Exchange
               Commission's rules and forms.

         (b)   There were no changes in the Registrant's internal control over
               financial reporting (as defined in Rule 30a-3(d) under the Act)
               during the Registrant's second fiscal half year that have
               materially affected, or are reasonably likely to materially
               affect, the Registrant's internal control over financial
               reporting.

ITEM 12. EXHIBITS.

        (a)(1) ANY CODE OF ETHICS, OR AMENDMENTS THERETO, THAT IS THE SUBJECT OF
               DISCLOSURE REQUIRED BY ITEM 2, TO THE EXTENT THAT THE REGISTRANT
               INTENDS TO SATISFY THE ITEM 2 REQUIREMENTS THROUGH THE FILING OF
               AN EXHIBIT.

               None.

        (a)(2) A SEPARATE CERTIFICATION FOR EACH PRINCIPAL EXECUTIVE OFFICER AND
               PRINCIPAL FINANCIAL OFFICER OF THE REGISTRANT AS REQUIRED BY RULE
               30a-2 UNDER THE ACT.

               Attached hereto as EX-99.31.1
               Attached hereto as EX-99.31.2

        (a)(3) ANY WRITTEN SOLICITATION TO PURCHASE SECURITIES UNDER RULE 23c-1
               UNDER THE ACT (17 CFR 270.23c-1) SENT OR GIVEN DURING THE PERIOD
               COVERED BY THE REPORT BY OR ON BEHALF OF THE REGISTRANT TO 10 OR
               MORE PERSONS.

               Not applicable for this filing.

        (b)    CERTIFICATIONS PURSUANT TO RULE 302-2(b) UNDER THE ACT.

               Attached hereto as EX-99.32


                                   SIGNATURES

            Pursuant to the requirements of the Securities Exchange Act of 1934
and the Investment Company Act of 1940, the Registrant has duly caused this
report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant):   MassMutual Participation Investors
                ----------------------------------
By:             /s/ Michael L. Klofas
                ----------------------------------
                Michael L. Klofas, President
                ----------------------------------
Date:           March 7, 2011
                ----------------------------------

            Pursuant to the requirements of the Securities Exchange Act of 1934
and the Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the Registrant and in the capacities and on the
dates indicated.

By:             /s/ Michael L. Klofas
                ----------------------------------
                Michael L. Klofas, President
                ----------------------------------
Date:           March 7, 2011
                ----------------------------------
By:             /s/ James M. Roy
                ----------------------------------
                James M. Roy, Vice President and
                Chief Financial Officer
                ----------------------------------
Date:           March 7, 2011
                ----------------------------------