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

                                   FORM 11 - K

 [X]     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE
         SECURITIES EXCHANGE ACT OF 1934 [FEE REQUIRED]

For the fiscal year ended....................December 31, 2001.................

                                       OR

 [ ]     TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES
         EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

For the transition period from......................to........................

      Commission file number...........000-14824............[Plexus Corp.]

A.       Full title of the plan and the address of the plan, if different from
         that of the issuer named below:

                        PLEXUS CORP. 401(k) SAVINGS PLAN

B.       Name of issuer of the securities held pursuant to the plan and the
         address of its principal executive office:

                                  PLEXUS CORP.
                             55 JEWELERS PARK DRIVE
                                NEENAH, WI 54956











PLEXUS CORP.
401(k) SAVINGS PLAN
FINANCIAL STATEMENTS AND REPORT
DECEMBER 31, 2001 AND 2000




























PLEXUS CORP.
401(k) SAVINGS PLAN
INDEX TO FINANCIAL STATEMENTS
--------------------------------------------------------------------------------



                                                                           Page
                                                                           ----
Report of Independent Accountants                                            1

Statements of Net Assets Available for Benefits
  as of December 31, 2001 and 2000                                           2

Statement of Changes in Net Assets Available for Benefits
  for the year ended December 31, 2001                                       3

Notes to Financial Statements                                               4-7

Schedule required by the Department of Labor's Rules and Regulations: *

     Form 5500, Schedule of Assets (Held at End of Year)
       as of December 31, 2001                                               8













* Other schedules required by the Department of Labor have been omitted because
they are not applicable.






                        REPORT OF INDEPENDENT ACCOUNTANTS


To the Participants and Administrator
of the Plexus Corp. 401(k) Savings Plan


In our opinion, the accompanying statements of net assets available for benefits
and the related statement of changes in net assets available for benefits
present fairly, in all material respects, the net assets available for benefits
of the Plexus Corp. 401(k) Savings Plan (the "Plan") as of December 31, 2001 and
2000, and the changes in net assets available for benefits for the year ended
December 31, 2001 in conformity with accounting principles generally accepted in
the United States of America. These financial statements are the responsibility
of the Plan's management; our responsibility is to express an opinion on these
financial statements based on our audits. We conducted our audits of these
statements in accordance with auditing standards generally accepted in the
United States of America, which require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements, assessing
the accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

Our audits were conducted for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental Schedule of Assets (Held
at End of Year) is presented for the purpose of additional analysis and is not a
required part of the basic financial statements but is supplementary information
required by the Department of Labor's Rules and Regulations for Reporting and
Disclosure under the Employee Retirement Income Security Act of 1974. This
supplemental schedule is the responsibility of the Plan's management. The
supplemental schedule has been subjected to the auditing procedures applied in
the audits of the basic financial statements and, in our opinion, is fairly
stated in all material respects in relation to the basic financial statements
taken as a whole.


PricewaterhouseCoopers LLP


May 7, 2002





PLEXUS CORP. 401(K) SAVINGS PLAN
STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2001 AND 2000
-------------------------------------------------------------------------------



                                                                                          2001                  2000
                                                                                      ------------         -------------
                                                                                                  
Assets
Investments (See Note 3)                                                              $ 84,660,171         $  89,944,551
Participant loans                                                                        3,010,849             2,739,301

Receivables:
  Employer's contribution                                                                   93,180                73,977
  Participants' contributions                                                              278,203               243,955
                                                                                      ------------         -------------
    Total receivables                                                                      371,383               317,932
                                                                                      ------------         -------------
Net assets available for benefits                                                     $ 88,042,403         $  93,001,784
                                                                                      ============         =============





The accompanying notes are an integral part of these financial statements.

                                      - 2 -





PLEXUS CORP. 401(K) SAVINGS PLAN
STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
FOR THE YEAR ENDED DECEMBER 31, 2001
-------------------------------------------------------------------------------


                                                             
Additions
Additions to net assets attributed to:
  Investment income:
    Net depreciation in fair value of investments                  $(11,863,420)
    Interest and dividends                                              856,846
                                                                   ------------

                                                                    (11,006,574)
                                                                   ------------
  Contributions:
    Participants'                                                     8,261,042
    Employer's                                                        2,286,443
                                                                   ------------

                                                                     10,547,485
                                                                   ------------
    Total additions (net deductions)                                   (459,089)

Deductions
Deductions from net assets attributed to:
  Benefits paid to participants                                       6,088,993
  Administrative expenses                                                56,673
                                                                   ------------

    Total deductions                                                  6,145,666

  Net decrease before plan transfers                                 (6,604,755)

Transfer in from other plan                                           1,645,374
                                                                   ------------

  Net decrease                                                       (4,959,381)

Net assets available for benefits:
  Beginning of year                                                  93,001,784
                                                                   ------------
  End of year                                                      $ 88,042,403
                                                                   ============







The accompanying notes are an integral part of these financial statements.

                                     - 3 -






PLEXUS CORP. 401(K) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 2001 AND 2000
-------------------------------------------------------------------------------

1.       DESCRIPTION OF PLAN

         The following description of the Plexus Corp. 401(k) Savings Plan (the
         "Plan") provides only general information. Participants should refer to
         the plan agreement for a more complete description of the Plan's
         provisions.

         GENERAL
         The Plan, originally effective January 1, 1989 and amended and restated
         effective March 1, 2000, is a contributory defined contribution plan
         covering substantially all employees of Plexus Corp. (the "Company")
         who have completed 90 days of service. The Plan is subject to the
         provisions of the Employee Retirement Income Security Act of 1974
         ("ERISA"). Effective March 1, 2000, MFS Heritage Trust Company became
         the trustee of the Plan. On April 1, 2001, the e2E Corporation 401(k) &
         Profit Sharing Plan merged into the Plan.

         CONTRIBUTIONS
         Employee pre-tax contributions are based on voluntary elections via
         phone or internet by the participants, directing the Company to defer a
         stated amount from the participant's compensation. Participants may
         elect to defer up to 18% of their annual compensation. The Company will
         make a matching contribution on behalf of a participant equal to 100%
         of the first 2.5% of the participant's elective deferrals for
         participants who have completed one year of service. Contributions are
         limited by Section 401(k) of the Internal Revenue Code.

         INVESTMENT ALTERNATIVES
         Plan participants may direct their entire account balances in 1%
         increments to any of the various investment options offered by the
         Plan. Participants may change their investment options on a daily
         basis.

         PARTICIPANT ACCOUNTS AND ALLOCATIONS

         Participant record keeping is performed by MFS Retirement Services,
         Inc. ("MFS"). For all investment programs which are mutual funds, MFS
         maintains participant balances on a share method. Participant
         investments in the Plexus Unitized Stock Fund, Conservative Portfolio
         Option, Moderate Portfolio Option, Aggressive Portfolio Option, and MFS
         Fixed Fund are accounted for on a unit value method. Units and unit
         values for these funds as of December 31, 2001 and 2000 were as
         follows:



                                                           Units                            Unit Value
                                                -----------------------------        ---------------------------
                                                        December 31,                        December 31,
                                                -----------------------------        ---------------------------
                                                    2001             2000               2001            2000
                                                -----------       -----------        -----------     -----------

                                                                                       
Plexus Unitized Stock Fund                        3,391,372        3,794,128          $  9.80         $ 11.12
Conservative Portfolio Option                        76,942           38,908             9.89           10.09
Moderate Portfolio Option                            98,710           40,550             8.72            9.86
Aggressive Portfolio Option                         212,744          126,433             7.24            9.01
MFS Fixed Fund                                    8,609,236        3,289,130             1.00            1.00








                                     - 4 -



PLEXUS CORP. 401(K) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 2001 AND 2000
-------------------------------------------------------------------------------


         Each participant's account is credited with the participant's
         contributions and allocations of Company contributions and plan
         earnings (losses). Allocations of plan earnings (losses) are based on
         participant account balances in relation to total fund account
         balances, as defined by the plan document.

         VESTING AND DISTRIBUTIONS
         Participants immediately vest in all contributions made to the Plan.
         Participant accounts are distributable in the form of a lump sum
         payment or substantially equal installments of cash or in whole shares
         of Company securities as elected by the participant upon retirement,
         termination of employment, death, disability, financial hardship or
         attainment of age 59-1/2. In addition, participant accounts can be
         rolled over into an individual retirement account ("IRA") or another
         qualified defined contribution plan. Participant distributions may not
         be deferred past April 1 of the calendar year following the year in
         which the participant attains age 70-1/2. Forfeitures of unclaimed
         distributions are used to reduce Company matching contributions.

         PARTICIPANT LOANS
         Effective March 1, 2000, participants may borrow from their accounts a
         minimum of $1,000 up to a maximum amount equal to the lesser of $50,000
         or 50 percent of their vested account balance. Loan terms range up to
         five years. Loans are secured by the balance in the participant's
         account and bear interest at the prime rate plus one percent. Principal
         and interest is paid ratably through regular payroll deductions.


  2.     SUMMARY OF ACCOUNTING POLICIES

         ACCOUNTING METHOD
         The financial statements of the Plan are prepared under the accrual
         method of accounting.

         USE OF ESTIMATES
         The preparation of financial statements in conformity with generally
         accepted accounting principles requires management to make estimates
         and assumptions that affect the reported amounts of assets,
         liabilities, and changes therein, and disclosure of contingent assets
         and liabilities. Actual results could differ from those estimates.

         INVESTMENT VALUATION AND INCOME RECOGNITION
         The Plan's investments are stated at fair value. The share value of
         mutual funds is based on quoted market prices on the last business day
         of the plan year. The unit value of unitized funds and common trust
         funds is computed daily based on share price, dividend information and
         the value of the fund's short-term investments. Participant loans are
         stated at cost, which approximates fair value. The Plan presents in the
         statement of changes in net assets available for benefits, the net
         appreciation in the fair value of its investments which consists of the
         realized gains or losses and the unrealized appreciation (depreciation)
         on those investments. Purchases and sales of investments are recorded
         on a trade-date basis. Dividends are recorded on the ex-dividend date.
         Interest is recognized when earned.

         RISKS AND UNCERTAINTIES
         The Plan's investments are exposed to various risks, such as interest
         rate, market and credit risks. Due to the level of risk associated with
         certain investments and the level of uncertainty related to changes in
         the values of investments, it is at least reasonably possible that
         changes in risks in the


                                     - 5 -


PLEXUS CORP. 401(K) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 2001 AND 2000
-------------------------------------------------------------------------------


         near term would materially affect participants' account balances and
         the amounts reported in the statements of net assets available for
         benefits and the statement of changes in net assets available for
         benefits.

         PAYMENT OF BENEFITS
         Benefits are recorded when paid.

         ADMINISTRATIVE EXPENSES
         Certain expenses incurred in the administration of the Plan are paid by
         the Company and are not reflected within these financial statements.


3.       INVESTMENTS

         The following presents investments that represent 5 percent or more
         of the Plan's net assets:



                                                                                          December 31,
                                                                                ---------------------------------
                                                                                    2001                 2000
                                                                                ------------         ------------
                                                                                               
Plexus Corp. Common Stock, 1,209,726 and
  1,388,309 shares, respectively                                                $ 32,130,322         $ 42,190,708

MFS Capital Opportunities Fund, 636,835 and
  519,745 shares, respectively                                                     8,552,700            9,298,245

Munder Index 500 Fund, 287,979 and 230,013
  shares, respectively                                                             6,897,086            6,346,057

MFS Value Fund, 294,242 and 274,389
  shares, respectively                                                             5,714,175            5,830,772

MFS Mid Cap Growth Fund, 600,709 and
  539,869 shares, respectively                                                     6,583,769            7,390,809

MFS New Discovery Fund, 273,935 and
  239,554 shares, respectively                                                     4,708,936            4,340,718

MFS Fixed Fund, 8,609,236 and
  3,289,130 units, respectively                                                    8,609,236            3,289,130


         During 2001, the Plan's investments (including gains and losses on
         investments bought and sold, as well as held during the year)
         depreciated in value by $(11,863,420), as follows:


                                             
     Mutual funds                                    $  (7,895,140)
     Common stock                                       (3,968,280)
                                                     -------------
                                                     $ (11,863,420)
                                                     =============




                                     - 6 -



PLEXUS CORP. 401(K) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 2001 AND 2000
-------------------------------------------------------------------------------


4.       AMOUNTS ALLOCATED TO WITHDRAWN PARTICIPANTS

         Approximately $6,640,836 and $6,756,293 of plan assets have been
         allocated to the accounts of persons who are no longer active
         participants of the Plan as of December 31, 2001 and 2000,
         respectively, but who have not yet received distributions as of that
         date.


5.       TAX STATUS

         The Internal Revenue Service has determined and informed the Company by
         a letter dated May 6, 1998, that the Plan is designed in accordance
         with applicable sections of the Internal Revenue Code ("IRC"). The Plan
         has been amended since receiving the determination letter. However, the
         plan administrator believes that the Plan is designed and is currently
         being operated in compliance with the applicable requirements of the
         IRC.


6.       PLAN TERMINATION

         Although it has not expressed any intent to do so, the Company has the
         right under the Plan to discontinue its contributions at any time and
         to terminate the Plan subject to the provisions of ERISA.


7.       RELATED PARTY TRANSACTIONS

         Certain plan investments represent shares of funds managed by MFS
         Heritage Trust Company, the trustee of the Plan, employer securities
         and participant loans. These transactions are considered
         party-in-interest transactions. These transactions are not, however,
         considered prohibited transactions under 29 CFR 408(b) of the ERISA
         regulations.


8.       SUBSEQUENT EVENT

         Effective January 1, 2002, the Qtron, Inc. 401(k) Profit Sharing Plan
         was merged into the Plan.




                                     - 7 -




PLEXUS CORP. 401(k) SAVINGS PLAN
FORM 5500, SCHEDULE OF ASSETS (HELD AT END OF YEAR)
DECEMBER 31, 2001
-------------------------------------------------------------------------------



              Identity of Issuer,
              Borrower, Lessor                                                                        Current
              or Similar Party                           Description of Investment                     Value
---------------------------------------------       -----------------------------------          ----------------
                                                                                         
*   Plexus Corp. Common Stock                        Common Stock                                  $  32,130,322

*   MFS Capital Opportunities Fund                   Mutual Fund                                       8,552,700

*   MFS Strategic Income Fund                        Mutual Fund                                       1,744,302

*   MFS Mid Cap Growth Fund                          Mutual Fund                                       6,583,769

*   MFS Value Fund                                   Mutual Fund                                       5,714,175

*   MFS New Discovery Fund                           Mutual Fund                                       4,708,936

*   MFS Fixed Fund                                   Common Trust Fund                                 8,609,236

    American EuroPacific Growth Fund                 Mutual Fund                                       4,369,813

    INVESCO Balanced Fund                            Mutual Fund                                       1,563,626

    Janus Aspen Worldwide Fund                       Mutual Fund                                       2,138,013

    Janus Aspen Aggressive Growth Fund               Mutual Fund                                         733,005

    Munder Index 500 Fund                            Mutual Fund                                       6,897,086

    Dreyfus Premier Technology Fund                  Mutual Fund                                         915,188
                                                                                                   -------------
                                                                                                   $  84,660,171
                                                                                                   =============

*   Participant Loans                                Interest rates ranging from 5.75%
                                                     to 10.50%; maturity dates ranging
                                                     from 2002 to 2006                             $   3,010,849
                                                                                                   =============




*  Party-in-interest.

See Report of Independent Accountants.



                                     - 8 -


                                   SIGNATURES

The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934,
the trustees (or other persons who administer the employee benefit plan) have
duly caused this annual report to be signed on its behalf by the undersigned
hereunto duly authorized.

                                      PLEXUS CORP. EMPLOYEE STOCK SAVINGS PLAN

Date:  June 26, 2002
                                      /s/ Jos. D. Kaufman
                                     ---------------------------------------
                                      Joseph D. Kaufman
                                      Employee Stock Savings Plan Fiduciary
                                      Committee Member