UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

FORM N-Q

 

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

 

Investment Company Act file number 811-21178

 

Name of Fund: BlackRock Insured Municipal Income Trust (BYM)

 

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

 

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock Insured Municipal Income Trust, 55 East 52nd Street, New York, NY 10055.

 

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

 

Date of fiscal year end: 08/31/2010

 

Date of reporting period: 05/31/2010

 

Item 1 – Schedule of Investments

 


 

 


 

 

Schedule of Investments May 31, 2010 (Unaudited)

BlackRock Insured Municipal Income Trust (BYM)

 

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

Municipal Bonds

 

Par
(000)

 

Value

 







Alabama — 1.0%

 

 

 

 

 

 

 

Birmingham Special Care Facilities
Financing Authority, RB, Children’s
Hospital (AGC), 6.00%, 6/01/39

 

$

1,495

 

$

1,630,208

 

County of Jefferson Alabama, RB,
Series A, 4.75%, 1/01/25

 

 

2,800

 

 

2,216,116

 

 

 

 

 

 

 

 

 

 

 

 

 

 




 

 

 

 

 

 

3,846,324

 









Arizona — 0.6%

 

 

 

 

 

 

 

State of Arizona, COP, Department of
Administration, Series A (AGM):

 

 

 

 

 

 

 

5.00%, 10/01/27

 

 

1,500

 

 

1,567,080

 

5.25%, 10/01/28

 

 

650

 

 

688,844

 

 

 

 

 

 




 

 

 

 

 

 

2,255,924

 









California — 28.8%

 

 

 

 

 

 

 

Arcadia Unified School District
California, GO, CAB, Election of 2006,
Series A (AGM), 4.96%, 8/01/39 (a)

 

 

2,000

 

 

298,340

 

California Health Facilities Financing
Authority, Refunding RB, St. Joseph
Health System, Series A, 5.75%,
7/01/39

 

 

625

 

 

651,919

 

California Infrastructure & Economic
Development Bank, RB, Bay Area Toll
Bridges, First Lien, Series A (AMBAC),
5.00%, 1/01/28 (b)

 

 

10,100

 

 

11,974,358

 

Coast Community College District
California, GO, Refunding, CAB,
Election of 2002, Series C (AGM):

 

 

 

 

 

 

 

5.58%, 8/01/13 (c)

 

 

7,450

 

 

6,173,591

 

5.40%, 8/01/36 (a)

 

 

4,200

 

 

803,376

 

Fresno Unified School District California,
GO, Election of 2001, Series E (AGM),
5.00%, 8/01/30

 

 

1,100

 

 

1,127,511

 

Golden State Tobacco Securitization
Corp. California, RB,
Series 2003-A-1 (b):

 

 

 

 

 

 

 

6.63%, 6/01/13

 

 

6,500

 

 

7,522,060

 

6.75%, 6/01/13

 

 

14,500

 

 

16,833,340

 

Los Angeles Municipal Improvement
Corp., RB, Series B1 (NPFGC), 4.75%,
8/01/37

 

 

4,000

 

 

3,812,040

 

Metropolitan Water District of Southern
California, RB, Series B-1 (NPFGC),
5.00%, 10/01/33

 

 

17,500

 

 

17,892,875

 

Monterey Peninsula Community College
District, GO, CAB, Series C (AGM) (a):

 

 

 

 

 

 

 

5.15%, 8/01/31

 

 

13,575

 

 

3,617,330

 

5.16%, 8/01/32

 

 

14,150

 

 

3,520,378

 


 

 

 

 

 

 

 

 

Municipal Bonds

 

Par
(000)

 

Value

 







California (concluded)

 

 

 

 

 

 

 

Orange County Sanitation District, COP,
Series B (AGM), 5.00%, 2/01/31

 

$

2,500

 

$

2,630,100

 

Sacramento Unified School District
California, GO, Election of 2002
(NPFGC), 5.00%, 7/01/30

 

 

2,700

 

 

2,757,024

 

San Francisco City & County Public
Utilities Commission, Refunding RB,
Series A (AGM), 5.00%, 11/01/31

 

 

15,000

 

 

15,132,750

 

San Joaquin Hills Transportation
Corridor Agency California, Refunding
RB, CAB, Series A (NPFGC), 5.50%,
1/15/31 (a)

 

 

53,000

 

 

10,077,950

 

San Jose Unified School District Santa
Clara County California, GO, Election
of 2002, Series B (NPFGC), 5.00%,
8/01/29

 

 

2,350

 

 

2,423,250

 

 

 

 

 

 




 

 

 

 

 

 

107,248,192

 









District of Columbia — 2.6%

 

 

 

 

 

 

 

District of Columbia Tobacco Settlement
Financing Corp., Refunding RB, Asset-
Backed, 6.75%, 5/15/40

 

 

9,500

 

 

9,499,620

 









Florida — 13.3%

 

 

 

 

 

 

 

Broward County School Board Florida,
COP, Series A (AGM), 5.25%, 7/01/33

 

 

2,000

 

 

2,070,520

 

City of Tallahassee Florida, RB (NPFGC),
5.00%, 10/01/32

 

 

3,000

 

 

3,075,750

 

County of Broward Florida, RB, Series A,
5.25%, 10/01/34

 

 

950

 

 

994,327

 

County of Duval Florida, COP, Master
Lease Program (AGM), 5.00%,
7/01/33

 

 

2,800

 

 

2,821,476

 

County of Miami-Dade Florida, RB:

 

 

 

 

 

 

 

CAB, Sub-Series A (NPFGC), 5.25%,
10/01/38 (a)

 

 

25,520

 

 

3,804,011

 

Jackson Health System (AGC),
5.75%, 6/01/39

 

 

2,300

 

 

2,431,744

 

Water & Sewer System (AGM),
5.00%, 10/01/39

 

 

10,100

 

 

10,462,590

 

County of Miami-Dade Florida,
Refunding RB (AGM), 5.00%,
7/01/35

 

 

1,300

 

 

1,330,342

 

Florida Housing Finance Corp., RB,
Homeowner Mortgage, Series 3
(GNMA), 5.45%, 7/01/33

 

 

4,480

 

 

4,624,391

 


 


Portfolio Abbreviations

To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the securities have been abbreviated according to the following list:

 

 

AGC

Assured Guaranty Corp.

AGM

Assured Guaranty Municipal Corp.

AMBAC

American Municipal Bond Assurance Corp.

BHAC

Berkshire Hathaway Assurance Corp.

CAB

Capital Appreciation Bonds

COP

Certificates of Participation

ERB

Education Revenue Bonds

GNMA

Government National Mortgage Association

GO

General Obligation Bonds

IDA

Industrial Development Authority

ISD

Independent School District

NPFGC

National Public Finance Guarantee Corp.

PSF-GTD

Permanent School Fund Guaranteed

RB

Revenue Bonds

SBPA

Stand-by Bond Purchase Agreement

VRDN

Variable Rate Demand Notes


 

 

 




BLACKROCK INSURED MUNICIPAL INCOME TRUST

MAY 31, 2010

1




 

 


 

 

Schedule of Investments (continued)

BlackRock Insured Municipal Income Trust (BYM)

 

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

Municipal Bonds

 

Par
(000)

 

Value

 







Florida (concluded)

 

 

 

 

 

 

 

Florida State Department of
Environmental Protection, RB,
Series B (NPFGC), 5.00%, 7/01/27

 

$

7,500

 

$

7,782,600

 

Miami-Dade County School Board, COP,
Refunding, Series B (AGC), 5.25%,
5/01/31

 

 

3,500

 

 

3,642,450

 

Orange County School Board, COP,
Series A (AGC), 5.50%, 8/01/34

 

 

5,590

 

 

5,975,654

 

Sarasota County Public Hospital District,
RB, Sarasota Memorial Hospital
Project, Series A, 5.63%, 7/01/39

 

 

300

 

 

311,994

 

 

 

 

 

 




 

 

 

 

 

 

49,327,849

 









Georgia — 0.3%

 

 

 

 

 

 

 

Gwinnett County Hospital Authority,
Refunding RB, Gwinnett Hospital
System, Series D (AGM), 5.50%,
7/01/41

 

 

900

 

 

918,666

 









Illinois — 4.8%

 

 

 

 

 

 

 

Chicago Board of Education Illinois, GO,
Refunding, Chicago School Reform
Board, Series A (NPFGC), 5.50%,
12/01/26

 

 

2,500

 

 

2,813,225

 

City of Chicago Illinois, GO, Refunding,
Series A (AGM), 5.00%, 1/01/25

 

 

1,000

 

 

1,054,240

 

City of Chicago Illinois, RB, Series A
(AGC), 5.00%, 1/01/38

 

 

7,310

 

 

7,495,308

 

Illinois Municipal Electric Agency, RB,
Series A (NPFGC), 5.25%, 2/01/27

 

 

4,800

 

 

5,039,136

 

State of Illinois, RB, Build Illinois,
Series B, 5.25%, 6/15/34

 

 

1,400

 

 

1,465,632

 

 

 

 

 

 




 

 

 

 

 

 

17,867,541

 









Indiana — 0.7%

 

 

 

 

 

 

 

Indiana Municipal Power Agency, RB:

 

 

 

 

 

 

 

Indiana Municipal Power Agency,
Series B, 5.75%, 1/01/34

 

 

450

 

 

478,948

 

Series A (NPFGC), 5.00%, 1/01/37

 

 

2,050

 

 

2,072,837

 

 

 

 

 

 




 

 

 

 

 

 

2,551,785

 









Iowa — 1.4%

 

 

 

 

 

 

 

Iowa Finance Authority, RB, Series A
(AGC), 5.63%, 8/15/37

 

 

5,000

 

 

5,326,850

 









Kentucky — 0.4%

 

 

 

 

 

 

 

Kentucky State Property & Buildings
Commission, Refunding RB, Project
No. 93 (AGC), 5.25%, 2/01/29

 

 

1,500

 

 

1,629,330

 









Louisiana — 2.1%

 

 

 

 

 

 

 

State of Louisiana, RB, Series A (AGM),
5.00%, 5/01/31

 

 

7,500

 

 

7,831,575

 









Michigan — 2.7%

 

 

 

 

 

 

 

City of Detroit Michigan, RB:

 

 

 

 

 

 

 

Senior Lien, Series A (NPFGC),
5.00%, 7/01/30

 

 

1,000

 

 

983,770

 


 

 

 

 

 

 

 

 

Municipal Bonds

 

Par
(000)

 

Value

 







Michigan (concluded)

 

 

 

 

 

 

 

City of Detroit Michigan, RB (concluded):

 

 

 

 

 

 

 

Senior Lien, Series A (NPFGC),
5.00%, 7/01/34

 

$

2,660

 

$

2,601,560

 

System, Second Lien, Series A
(BHAC), 5.50%, 7/01/36

 

 

2,900

 

 

3,011,012

 

System, Second Lien, Series B
(NPFGC), 5.00%, 7/01/36

 

 

400

 

 

395,384

 

City of Detroit Michigan, Refunding RB,
Second Lien, Series E (BHAC), 5.75%,
7/01/31

 

 

3,000

 

 

3,214,020

 

 

 

 

 

 




 

 

 

 

 

 

10,205,746

 









Nevada — 7.7%

 

 

 

 

 

 

 

City of Reno Nevada, Refunding RB,
Senior Lien, ReTrac-Reno
Transportation Project (AMBAC),
5.13%, 6/01/12 (b)

 

 

2,500

 

 

2,715,875

 

County of Clark Nevada, RB:

 

 

 

 

 

 

 

Las Vegas-McCarran International
Airport, Series A (AGC), 5.25%,
7/01/39

 

 

4,100

 

 

4,174,005

 

Subordinate Lien, Series A2 (BHAC),
5.00%, 7/01/30

 

 

2,500

 

 

2,558,325

 

System, Subordinate Lien, Series C
(AGM), 5.00%, 7/01/26

 

 

1,650

 

 

1,713,426

 

Truckee Meadows Water Authority, RB,
Series A (AGM) (b):

 

 

 

 

 

 

 

5.00%, 7/01/11

 

 

10,000

 

 

10,499,400

 

5.13%, 7/01/11

 

 

6,500

 

 

6,833,450

 

 

 

 

 

 




 

 

 

 

 

 

28,494,481

 









New York — 0.4%

 

 

 

 

 

 

 

New York State Dormitory Authority,
ERB, Series B, 5.75%, 3/15/36

 

 

1,300

 

 

1,477,567

 









Ohio — 0.3%

 

 

 

 

 

 

 

Ohio Higher Educational Facility
Commission, Refunding RB, Summa
Health System, 2010 Project (AGC),
5.25%, 11/15/40

 

 

1,125

 

 

1,123,448

 









Pennsylvania — 1.5%

 

 

 

 

 

 

 

City of Philadelphia Pennsylvania, RB,
Third Series (AGM), 5.13%,
8/01/11 (b)

 

 

5,200

 

 

5,482,828

 









Puerto Rico — 1.6%

 

 

 

 

 

 

 

Puerto Rico Sales Tax Financing Corp.,
RB, First Sub-Series A, 6.38%,
8/01/39

 

 

5,300

 

 

5,950,840

 









Rhode Island — 0.8%

 

 

 

 

 

 

 

Rhode Island Health & Educational
Building Corp., Refunding RB, Public
Schools Financing Program, Series E
(AGC), 6.00%, 5/15/29

 

 

2,625

 

 

2,918,895

 










 

 

 




2

BLACKROCK INSURED MUNICIPAL INCOME TRUST

MAY 31, 2010




 

 


 

 

Schedule of Investments (continued)

BlackRock Insured Municipal Income Trust (BYM)

 

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

Municipal Bonds

 

Par
(000)

 

Value

 







South Carolina — 2.9%

 

 

 

 

 

 

 

South Carolina Transportation
Infrastructure Bank, RB, Junior Lien,
Series B (AMBAC), 5.13%,
10/01/11 (b)

 

$

10,000

 

$

10,614,800

 









Tennessee — 5.7%

 

 

 

 

 

 

 

Knox County Health Educational &
Housing Facilities Board Tennessee,
Refunding RB (AGM), Series A (a):

 

 

 

 

 

 

 

CAB, 5.84%, 1/01/22

 

 

11,705

 

 

6,192,296

 

CAB, 5.88%, 1/01/23

 

 

9,260

 

 

4,594,071

 

CAB, 5.90%, 1/01/24

 

 

8,500

 

 

3,959,980

 

CAB, 5.91%, 1/01/25

 

 

6,850

 

 

3,001,464

 

CAB, 5.93%, 1/01/26

 

 

5,000

 

 

2,057,000

 

Covenant, Series A, 4.75%,
1/01/41

 

 

7,250

 

 

1,325,663

 

 

 

 

 

 




 

 

 

 

 

 

21,130,474

 









Texas — 28.6%

 

 

 

 

 

 

 

City of Houston Texas, RB, Senior Lien,
Series A, 5.50%, 7/01/34

 

 

4,165

 

 

4,488,579

 

City of San Antonio Texas, Refunding RB
(NPFGC):

 

 

 

 

 

 

 

5.13%, 5/15/29

 

 

9,250

 

 

9,715,830

 

5.13%, 5/15/34

 

 

10,000

 

 

10,445,000

 

Coppell ISD Texas, GO, Refunding, CAB
(PSF-GTD), 5.64%, 8/15/30 (a)

 

 

10,030

 

 

4,015,711

 

County of Harris Texas, GO (NPFGC) (a):

 

 

 

 

 

 

 

5.56%, 8/15/25

 

 

7,485

 

 

4,048,786

 

5.59%, 8/15/28

 

 

10,915

 

 

5,011,186

 

County of Harris Texas, Refunding RB,
Senior Lien, Toll Road (AGM), 5.00%,
8/15/30

 

 

5,510

 

 

5,665,602

 

Harris County-Houston Sports Authority,
Refunding RB (NPFGC) (a):

 

 

 

 

 

 

 

CAB, Junior Lien, Series H, 5.92%,
11/15/38

 

 

5,785

 

 

762,000

 

CAB, Junior Lien, Series H, 5.93%,
11/15/39

 

 

6,160

 

 

744,929

 

Third Lien, Series A-3, 5.97%,
11/15/38

 

 

26,890

 

 

3,541,951

 

Third Lien, Series A-3, 5.98%,
11/15/39

 

 

27,675

 

 

3,346,738

 

Lewisville ISD Texas, GO, Refunding,
CAB, School Building (NPFGC), 4.67%,
8/15/24 (a)

 

 

5,315

 

 

2,645,913

 

Mansfield ISD Texas, GO, School
Building (PSF-GTD), 5.00%, 2/15/33

 

 

2,980

 

 

3,146,582

 

North Texas Tollway Authority,
Refunding RB, First Tier:

 

 

 

 

 

 

 

CAB, System (AGC), 5.33%,
1/01/29 (a)

 

 

5,000

 

 

1,771,400

 

CAB, System (AGC), 5.45%,
1/01/30 (a)

 

 

1,205

 

 

401,434

 

Series A, 6.00%, 1/01/28

 

 

625

 

 

683,706

 

System (NPFGC), 5.75%, 1/01/40

 

 

23,050

 

 

23,923,364

 


 

 

 

 

 

 

 

 

Municipal Bonds

 

Par
(000)

 

Value

 







Texas (concluded)

 

 

 

 

 

 

 

Texas State Turnpike Authority, RB, First
Tier, Series A (AMBAC), 5.00%,
8/15/42

 

$

23,145

 

$

22,110,419

 

 

 

 

 

 




 

 

 

 

 

 

106,469,130

 









Washington — 6.5%

 

 

 

 

 

 

 

Chelan County Public Utility District
No. 1, RB, Chelan Hydro System,
Series C (AMBAC), 5.13%, 7/01/33

 

 

3,655

 

 

3,708,729

 

County of King Washington, Refunding
RB (AGM), 5.00%, 1/01/36

 

 

2,200

 

 

2,275,746

 

Port of Seattle Washington, RB, Series A
(NPFGC), 5.00%, 4/01/31

 

 

4,500

 

 

4,535,145

 

State of Washington, GO, Various
Purpose, Series 02-A (AGM), 5.00%,
7/01/25

 

 

6,045

 

 

6,264,796

 

Washington Health Care Facilities
Authority, RB, MultiCare Health Care,
Series C (AGC), 5.50%, 8/15/43

 

 

6,600

 

 

6,788,166

 

Washington Health Care Facilities
Authority, Refunding RB, MultiCare
Health System, Series A (AGM),
5.50%, 8/15/38

 

 

700

 

 

725,193

 

 

 

 

 

 




 

 

 

 

 

 

24,297,775

 









Wisconsin — 0.4%

 

 

 

 

 

 

 

Wisconsin Health & Educational
Facilities Authority, RB, Ascension
Health Senior Credit Group, 5.00%,
11/15/33

 

 

1,500

 

 

1,530,585

 









Total Municipal Bonds – 115.1%

 

 

 

 

 

428,000,225

 









 

 

 

 

 

 

 

 









 

Municipal Bonds Transferred to Tender
Option Bond Trusts (d)

 

 

 

 

 

 

 









Arizona — 0.4%

 

 

 

 

 

 

 

Phoenix Civic Improvement Corp., RB,
Junior Lien, Series A, 5.00%, 7/01/34

 

 

1,300

 

 

1,364,831

 









California — 10.7%

 

 

 

 

 

 

 

California State University, Refunding
RB, Systemwide, Series A (AGM),
5.00%, 11/01/32 (d)(e)

 

 

8,000

 

 

8,116,560

 

California State University, RB,
Systemwide, Series A (AGM), 5.00%,
11/01/33

 

 

3,379

 

 

3,420,291

 

Foothill-De Anza Community College
District, GO, Election of 1999, Series
C (NPFGC), 5.00%, 8/01/36

 

 

7,500

 

 

7,657,050

 

Los Angeles Community College District
California, GO, Election of 2001,
Series A (AGM), 5.00%, 8/01/32

 

 

5,000

 

 

5,145,350

 


 

 

 




BLACKROCK INSURED MUNICIPAL INCOME TRUST

MAY 31, 2010

3




 

 


 

 

Schedule of Investments (continued)

BlackRock Insured Municipal Income Trust (BYM)

 

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

Municipal Bonds Transferred to Tender
Option Bond Trusts (d)

 

Par
(000)

 

Value

 







California (concluded)

 

 

 

 

 

 

 

San Diego Community College District
California, GO, Election of 2002,
5.25%, 8/01/33

 

$

449

 

$

477,271

 

San Diego County Water Authority, COP,
Refunding, Series 2008-A (AGM),
5.00%, 5/01/33

 

 

4,870

 

 

5,047,073

 

University of California, RB, Series C
(NPFGC), 4.75%, 5/15/37

 

 

10,000

 

 

9,820,700

 

 

 

 

 

 




 

 

 

 

 

 

39,684,295

 









District of Columbia — 0.3%

 

 

 

 

 

 

 

District of Columbia, RB, Series A,
5.50%, 12/01/30

 

 

1,080

 

 

1,218,013

 









Florida — 2.2%

 

 

 

 

 

 

 

City of Tallahassee Florida, RB (NPFGC),
5.00%, 10/01/37

 

 

5,000

 

 

5,088,800

 

Florida State Board of Education, GO,
Series D, 5.00%, 6/01/37

 

 

2,999

 

 

3,135,525

 

 

 

 

 

 




 

 

 

 

 

 

8,224,325

 









Hawaii — 2.7%

 

 

 

 

 

 

 

Honolulu City & County Board of Water
Supply, RB, Series A (NPFGC), 5.00%,
7/01/33

 

 

10,000

 

 

10,248,400

 









Illinois — 7.9%

 

 

 

 

 

 

 

Illinois State Toll Highway Authority, RB,
Series B, 5.50%, 1/01/33

 

 

4,499

 

 

4,903,409

 

Metropolitan Pier & Exposition Authority,
RB, McCormick Place Expansion
Project, Series A (NPFGC), 5.00%,
12/15/28

 

 

24,010

 

 

24,347,821

 

 

 

 

 

 




 

 

 

 

 

 

29,251,230

 









Massachusetts — 3.7%

 

 

 

 

 

 

 

Massachusetts School Building
Authority, RB, Series A (AGM), 5.00%,
8/15/30

 

 

12,987

 

 

13,636,101

 









Nevada — 1.8%

 

 

 

 

 

 

 

City of Las Vegas Nevada, GO, Limited
Tax, Performing Arts Center, 6.00%,
4/01/39

 

 

4,198

 

 

4,629,979

 

Clark County Water Reclamation
District, GO, Series B, 5.75%,
7/01/34

 

 

2,024

 

 

2,256,131

 

 

 

 

 

 




 

 

 

 

 

 

6,886,110

 









New York — 4.6%

 

 

 

 

 

 

 

Erie County Industrial Development
Agency, RB, City School District of
Buffalo Project, Series A (AGM),
5.75%, 5/01/28

 

 

4,494

 

 

4,952,166

 

Metropolitan Transportation Authority,
RB, Series A (NPFGC), 5.00%,
11/15/31

 

 

7,002

 

 

7,275,793

 


 

 

 

 

 

 

 

 

Municipal Bonds Transferred to Tender
Option Bond Trusts (d)

 

Par
(000)

 

Value

 







New York (concluded)

 

 

 

 

 

 

 

Triborough Bridge & Tunnel Authority,
RB, General, Series A-2, 5.25%,
11/15/34

 

$

4,500

 

$

4,856,850

 

 

 

 

 

 




 

 

 

 

 

 

17,084,809

 









Ohio — 0.2%

 

 

 

 

 

 

 

State of Ohio, RB, Cleveland Clinic
Health, Series B, 5.50%, 1/01/34

 

 

620

 

 

654,255

 









South Carolina — 0.2%

 

 

 

 

 

 

 

South Carolina State Public Service
Authority, RB, Santee Cooper,
Series A, 5.50%, 1/01/38

 

 

600

 

 

654,840

 









Texas — 2.7%

 

 

 

 

 

 

 

Northside ISD Texas, GO, School
Building (PSF-GTD), 5.13%, 6/15/29

 

 

9,500

 

 

10,178,823

 









Utah — 1.4%

 

 

 

 

 

 

 

Utah Transit Authority, RB, Series A
(AGM), 5.00%, 6/15/36

 

 

5,000

 

 

5,270,650

 









Virginia — 0.1%

 

 

 

 

 

 

 

Fairfax County IDA Virginia, Refunding
RB, Health Care, Inova Health System,
Series A, 5.50%, 5/15/35

 

 

400

 

 

423,800

 









Washington — 1.0%

 

 

 

 

 

 

 

Central Puget Sound Regional Transit
Authority, RB, Series A (AGM), 5.00%,
11/01/32

 

 

3,494

 

 

3,693,791

 









Total Municipal Bonds Transferred to
Tender Option Bond Trusts – 39.9%

 

 

 

 

 

148,474,273

 









Total Long-Term Investments
(Cost – $568,939,153) – 155.0%

 

 

 

 

 

576,474,498

 









 

 

 

 

 

 

 

 









 

Short-Term Securities

 

 

 

 

 

 

 









New York— 0.5%

 

 

 

 

 

 

 

City of New York New York, GO, VRDN,
Sub-Series A-6 (AGM), (Dexia Credit
Local SBPA), 0.28%, 6/01/10 (e)

 

 

1,700

 

 

1,700,000

 










 

 

 

 

 

 

 

 

 

 

Shares

 

 

 

 









Money Market Fund — 2.1%

 

 

 

 

 

 

 

FFI Institutional Tax-Exempt Fund,
0.25% (f)(g)

 

 

7,742,325

 

 

7,742,325

 









Total Short-Term Securities
(Cost – $9,442,325) – 2.6%

 

 

 

 

 

9,442,325

 


 

 

 




4

BLACKROCK INSURED MUNICIPAL INCOME TRUST

MAY 31, 2010




 

 


 

 

Schedule of Investments (concluded)

BlackRock Insured Municipal Income Trust (BYM)

 

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 

 

 

 

Value

 









Total Investments
(Cost – $578,381,478*) – 157.6%

 

 

 

 

$

585,916,823

 

Other Assets Less Liabilities – 0.3%

 

 

 

 

 

1,188,138

 

Liabilities for Trust Certificates, Including
Interest Expense and Fees Payable – (21.0)%

 

 

 

 

 

(77,966,026

)

Preferred Shares, at Redemptions Value – (36.9)%

 

 

 

 

 

(137,264,738

)

 

 

 

 

 




Net Assets Applicable to Common Shares – 100.0%

 

 

 

 

$

371,874,197

 

 

 

 

 

 





 

 

*

The cost and unrealized appreciation (depreciation) of investments as of May 31, 2010, as computed for federal income tax purposes, were as follows:


 

 

 

 

 

Aggregate cost

 

$

503,352,135

 

 

 




Gross unrealized appreciation

 

$

24,752,625

 

Gross unrealized depreciation

 

 

(20,102,448

)

 

 




Net unrealized appreciation

 

$

4,650,177

 

 

 





 

 

(a)

Represents a zero-coupon bond. Rate shown reflects the current yield as of report date.

 

 

(b)

US government securities, held in escrow, are used to pay interest on this security as well as to retire the bond in full at the date indicated, typically at a premium to par.

 

 

(c)

Represents a step-up bond that pays an initial coupon rate for the first period and then a higher coupon rate for the following periods. Rate shown reflects the current yield.

 

 

(d)

Securities represent bonds transferred to a tender option bond trust in exchange for which the Trust acquired residual interest certificates. These securities serve as collateral in a financing transaction.

 

 

(e)

Variable rate security. Rate shown is as of report date and maturity shown is the date the principal owed can be recovered through demand.

 

 

(f)

Investments in companies considered to be an affiliate of the Trust during the period, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:


 

 

 

 

 

 

 

 

 

 

 

 

 

 











Affiliate

 

Shares Held at
August 31,
2009

 

Net Activity

 

Shares Held
at May 31,
2010

 

Income

 











FFI Institutional
Tax-Exempt
Fund

 

 

4,401,744

 

 

3,340,581

 

 

7,742,325

 

$

5,671

 












 

 

 

(g)

Represents the current yield as of report date.

 

 

Fair Value Measurements - Various inputs are used in determining the fair value of investments, which are as follows:

 

 

 

Level 1 — price quotations in active markets/exchanges for identical assets and liabilities

 

 

 

 

Level 2 — other observable inputs (including, but not limited to: quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market-corroborated inputs)

 

 

 

 

Level 3 — unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the Trust’s own assumptions used in determining the fair value of investments)

 

 

 

The inputs or methodologies used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. For information about the Trust’s policy regarding valuation of investments and other significant accounting policies, please refer to the Trust’s most recent financial statements as contained in its semi-annual report.

 

 

 

The following table summarizes the inputs used as of May 31, 2010 in determining the fair valuation of the Trust’s investments:


 

 

 

 

 

 

 

 

 

 

 

 

 

 

Investments in Securities

 



Valuation Inputs

 

Level 1

 

Level 2

 

Level 3

 

Total

 











Assets:

 

 

 

 

 

 

 

 

 

 

 

 

 

Long Term
Investment1

 

 

 

$

576,474,498

 

 

 

$

576,474,498

 

Short-Term
Securities

 

$

7,742,325

 

 

1,700,000

 

 

 

 

9,442,325

 















Total

 

$

7,742,325

 

$

578,174,498

 

 

 

$

585,916,823

 

 

 














 

 

1

See above Schedule of Investments for values in each state or political subdivision.


 

 

 




BLACKROCK INSURED MUNICIPAL INCOME TRUST

MAY 31, 2010

5


Item 2 –

Controls and Procedures

 

 

2(a) –

The registrant's principal executive and principal financial officers or persons performing similar functions have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 13(a)-15(b) under the Securities Exchange Act of 1934, as amended.

 

 

2(b) –

There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting.

 

 

Item 3 –

Exhibits

 

 

 

Certifications – Attached hereto

 

 

 

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.

 

 

 

BlackRock Insured Municipal Income Trust

   
 

By:

/s/ Anne F. Ackerley  
    Anne F. Ackerley
    Chief Executive Officer of
    BlackRock Insured Municipal Income Trust
   
  Date: July 23, 2010
   
  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/ Anne F. Ackerley  
    Anne F. Ackerley
    Chief Executive Officer (principal executive officer) of
    BlackRock Insured Municipal Income Trust
   
  Date: July 23, 2010
   
 

By:

/s/ Neal J. Andrews  
    Neal J. Andrews
    Chief Financial Officer (principal financial officer) of
    BlackRock Insured Municipal Income Trust
   
  Date: July 23, 2010