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: Donald C. Burke, Chief Executive Officer, BlackRock Insured Municipal Income Trust, 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011

 

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

 

Date of fiscal year end: 08/31/2009

 

Date of reporting period: 05/31/2009

 

Item 1 – Schedule of Investments


 

 

BlackRock Insured Municipal Income Trust

 

 

 

Schedule of Investments May 31, 2009 (Unaudited)

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 











State

 

Municipal Bonds

 

Par
(000)

 

Value

 











Alabama - 0.5%

 

Jefferson County, Alabama, Limited Obligation School Warrants, Series A, 4.75%, 1/01/25

 

$

2,800

 

$

1,687,392

 











Arizona - 1.0%

 

Phoenix, Arizona, Civic Improvement Corp., Water System Revenue Refunding Bonds, Junior Lien, Series A, 5%, 7/01/34

 

 

1,300

 

 

1,318,460

 

 

 

Salt Verde Financial Corp., Arizona, Senior Gas Revenue Bonds, 5%, 12/01/37

 

 

2,500

 

 

1,989,125

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

3,307,585

 











California - 35.1%

 

Arcadia, California, Unified School District, GO (Election of 2006), CABS, Series A, 4.961%, 8/01/39 (a)(b)

 

 

2,000

 

 

285,580

 

 

 

California Infrastructure and Economic Development Bank, First Lien Revenue Bonds (Bay Area Toll Bridges Retrofit), Series A, 5%, 1/01/28 (c)(d)

 

 

10,100

 

 

11,458,147

 

 

 

California State Department of Water Resources, Power Supply Revenue Bonds, Series A, 5.375%, 5/01/12 (d)

 

 

10,000

 

 

11,245,500

 

 

 

Coast Community College District, California, GO, Refunding (Election of 2002), Series C, 5.50%, 8/01/13 (a)(e)

 

 

7,450

 

 

6,124,571

 

 

 

Coast Community College District, California, GO, Refunding (Election of 2002), Series C, 5.397%, 8/01/36 (a)(b)

 

 

4,200

 

 

778,512

 

 

 

Fresno, California, Unified School District, GO (Election of 2001), Series E, 5%, 8/01/30 (a)

 

 

1,100

 

 

1,103,872

 

 

 

Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series A-1, 6.625%, 6/01/13 (d)

 

 

6,500

 

 

7,577,180

 

 

 

Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series A-1, 6.75%, 6/01/13 (d)

 

 

14,500

 

 

16,971,960

 

 

 

Los Angeles, California, Community College District, GO (Election of 2001), Series A, 5%, 8/01/32 (a)(f)

 

 

5,000

 

 

4,959,000

 

 

 

Los Angeles, California, Municipal Improvement Corp., Lease Revenue Bonds, Series B1, 4.75%, 8/01/37 (f)(g)

 

 

4,000

 

 

3,625,560

 

 

 

Metropolitan Water District of Southern California, Waterworks Revenue Bonds, Series B-1, 5%, 10/01/33 (f)(g)

 

 

17,500

 

 

17,620,925

 

 

 

Monterey Peninsula Community College District, California, GO, CABS, Series C, 5.151%, 8/01/31 (a)(b)

 

 

13,575

 

 

3,425,380

 

 

 

Monterey Peninsula Community College District, California, GO, CABS, Series C, 5.161%, 8/01/32 (a)(b)

 

 

14,150

 

 

3,245,727

 

 

 

Orange County, California, Sanitation District, COP, Series B, 5%, 2/01/31 (a)

 

 

2,500

 

 

2,518,850

 



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 list below.

 

 

AMT

Alternative Minimum Tax (subject to)

CABS

Capital Appreciation Bonds

COP

Certificates of Participation

EDA

Economic Development Authority

GO

General Obligation Bonds

IDA

Industrial Development Authority

VRDN

Variable Rate Demand Notes

1


 

 

BlackRock Insured Municipal Income Trust

 

 

 

Schedule of Investments May 31, 2009 (Unaudited)

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 











State

 

Municipal Bonds

 

Par
(000)

 

Value

 









 

 

Sacramento, California, Unified School District, GO (Election of 2002), 5%, 7/01/30 (g)

 

$

2,700

 

$

2,689,416

 

 

 

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

 

 

450

 

 

459,572

 

 

 

San Francisco, California, City and County Public Utilities Commission, Water Revenue Refunding Bonds, Series A, 5%, 11/01/31 (a)

 

 

15,000

 

 

14,979,300

 

 

 

San Joaquin Hills, California, Transportation Corridor Agency, Toll Road Revenue Refunding Bonds, Series A, 5.491%, 1/15/31 (b)(g)

 

 

53,000

 

 

9,963,470

 

 

 

San Jose, California, Unified School District, Santa Clara County, GO (Election of 2002), Series B, 5%, 8/01/29 (f)(g)

 

 

2,350

 

 

2,362,220

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

121,394,742

 











District of Columbia - 2.8%

 

District of Columbia, Income Tax Revenue Bonds, Series A, 5.50%, 12/01/30

 

 

1,075

 

 

1,157,678

 

 

 

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

 

 

9,500

 

 

8,370,165

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

9,527,843

 











Florida - 14.8%

 

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

 

 

2,000

 

 

1,973,000

 

 

 

Broward County, Florida, Water and Sewer Utility Revenue Bonds, Series A, 5.25%, 10/01/34

 

 

950

 

 

953,201

 

 

 

Duval County, Florida, School Board, COP (Master Lease Program), 5%, 7/01/33 (a)

 

 

2,800

 

 

2,668,036

 

 

 

Florida Housing Finance Corporation, Homeowner Mortgage Revenue Bonds, Series 3, 5.45%, 7/01/33 (h)(i)(j)

 

 

5,000

 

 

5,040,650

 

 

 

Florida State Board of Education, GO, Series D, 5%, 6/01/37

 

 

3,000

 

 

2,977,650

 

 

 

Florida State Department of Environmental Protection, Preservation Revenue Bonds, Series B, 5%, 7/01/27 (g)

 

 

7,500

 

 

7,437,975

 

 

 

Jacksonville, Florida, Health Facilities Authority, Hospital Revenue Bonds (Baptist Medical Center Project), 5%, 8/15/37 (a)

 

 

1,900

 

 

1,779,977

 

 

 

Miami-Dade County, Florida, Aviation Revenue Bonds (Miami International Airport), Series B, 5%, 10/01/37 (f)(g)

 

 

8,650

 

 

7,904,889

 

 

 

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

 

 

3,600

 

 

3,625,344

 

 

 

Miami-Dade County, Florida, School Board, COP, Refunding, Series B, 5%, 5/01/33 (k)

 

 

7,500

 

 

7,275,750

 

 

 

Miami-Dade County, Florida, Special Obligation Revenue Bonds, Sub-Series A, 5.251%, 10/01/38 (b)(g)

 

 

25,520

 

 

3,158,355

 

 

 

Miami, Florida, Special Obligation Revenue Bonds (Street and Sidewalk Improvement Program), 5%, 1/01/37 (g)

 

 

1,000

 

 

922,740

 

 

 

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

 

 

5,590

 

 

5,646,794

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

51,364,361

 











2


 

 

BlackRock Insured Municipal Income Trust

 

 

 

Schedule of Investments May 31, 2009 (Unaudited)

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 











State

 

Municipal Bonds

 

Par
(000)

 

Value

 











Illinois - 5.6%

 

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

 

$

2,500

 

$

2,765,300

 

 

 

Chicago, Illinois, Motor Fuel Tax Revenue Bonds, Series A, 5%, 1/01/38 (k)

 

 

7,310

 

 

7,167,967

 

 

 

Illinois Municipal Electric Agency, Power Supply Revenue Bonds, Series A, 5.25%, 2/01/27 (f)(g)

 

 

4,800

 

 

4,893,744

 

 

 

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

 

 

4,500

 

 

4,671,225

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

19,498,236

 











Indiana - 0.8%

 

Indiana Municipal Power Agency, Power Supply System Revenue Bonds, Series A, 5%, 1/01/37 (g)

 

 

2,250

 

 

2,162,070

 

 

 

Indiana Municipal Power Agency, Power Supply System Revenue Bonds, Series B, 5.75%, 1/01/34

 

 

450

 

 

453,033

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

2,615,103

 











Kentucky - 0.5%

 

Kentucky State Property and Buildings Commission, Revenue Refunding Bonds (Project Number 93), 5.25%, 2/01/29 (k)

 

 

1,500

 

 

1,562,250

 











Louisiana - 4.1%

 

Louisiana State Gas and Fuels Tax Revenue Bonds, Series A, 5%, 5/01/31 (a)

 

 

7,500

 

 

7,582,800

 

 

 

Louisiana State Gas and Fuels Tax Revenue Bonds, Series A, 4.75%, 5/01/39 (a)

 

 

6,950

 

 

6,609,103

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

14,191,903

 











Michigan - 5.5%

 

Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Bonds, Series A, 5.50%, 7/01/36 (f)(l)

 

 

3,000

 

 

3,019,020

 

 

 

Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Bonds, Series B, 5%, 7/01/33 (f)(g)

 

 

4,000

 

 

3,470,760

 

 

 

Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Bonds, Series B, 5%, 7/01/36 (f)(g)

 

 

7,000

 

 

5,977,020

 

 

 

Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Refunding Bonds, Series E, 5.75%, 7/01/31 (f)(l)

 

 

3,000

 

 

3,111,540

 

 

 

Detroit, Michigan, Water Supply System Revenue Bonds, Senior Lien, Series A, 5%, 7/01/30 (f)(g)

 

 

1,000

 

 

889,950

 

 

 

Detroit, Michigan, Water Supply System Revenue Bonds, Senior Lien, Series A, 5%, 7/01/34 (g)

 

 

2,810

 

 

2,425,002

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

18,893,292

 











Nevada - 8.7%

 

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

 

 

2,025

 

 

2,147,391

 

 

 

Las Vegas, Nevada, Limited Tax, GO (Performing Arts Center), 6%, 4/01/39

 

 

4,200

 

 

4,468,506

 

 

 

Reno, Nevada, Sales and Room Tax Revenue Refunding Bonds (ReTrac-Reno Transportation Rail Access Corridor Project), Senior Lien, 5.125%, 6/01/12 (c)(d)

 

 

5,000

 

 

5,544,750

 

 

 

Truckee Meadows, Nevada, Water Authority, Water Revenue Bonds, Series A, 5%, 7/01/11 (a)(d)

 

 

10,000

 

 

10,818,300

 

 

 

Truckee Meadows, Nevada, Water Authority, Water Revenue Bonds, Series A, 5.125%, 7/01/11 (a)(d)

 

 

6,500

 

 

7,048,600

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

30,027,547

 











3


 

 

BlackRock Insured Municipal Income Trust

 

 

 

Schedule of Investments May 31, 2009 (Unaudited)

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 











State

 

Municipal Bonds

 

Par
(000)

 

 

Value

 











New Jersey - 0.1%

 

New Jersey EDA, School Facilities Construction, Revenue Refunding Bonds, Series AA, 5.50%, 12/15/29

 

$

250

 

$

258,573

 











New York - 1.5%

 

Metropolitan Transportation Authority, New York, Revenue Bonds, Series A, 5%, 11/15/31 (a)

 

 

3,950

 

 

3,991,554

 

 

 

New York State Dormitory Authority, State Personal Income Tax Revenue Bonds (Education), Series B, 5.75%, 3/15/36

 

 

1,300

 

 

1,396,551

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

5,388,105

 











Pennsylvania - 1.6%

 

Philadelphia, Pennsylvania, Gas Works Revenue Bonds, 3rd Series, 5.125%, 8/01/11 (a)(d)

 

 

5,200

 

 

5,651,464

 











Puerto Rico - 0.5%

 

Puerto Rico Electric Power Authority, Power Revenue Refunding Bonds, Series VV, 5.25%, 7/01/30 (f)(g)

 

 

2,000

 

 

1,921,060

 











South Carolina - 3.3%

 

South Carolina State Public Service Authority, Revenue Refunding Bonds, Series A, 5.50%, 1/01/38

 

 

600

 

 

631,008

 

 

 

South Carolina Transportation Infrastructure Bank Revenue Bonds, Junior Lien, Series B, 5.125%, 10/01/11 (c)(d)

 

 

10,000

 

 

10,914,600

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

11,545,608

 











Tennessee - 5.7%

 

Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.841%, 1/01/22 (a)(b)

 

 

11,705

 

 

5,738,610

 

 

 

Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.881%, 1/01/23 (a)(b)

 

 

9,260

 

 

4,248,488

 

 

 

Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.901%, 1/01/24 (a)(b)

 

 

8,500

 

 

3,655,680

 

 

 

Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.911%, 1/01/25 (a)(b)

 

 

6,850

 

 

2,763,907

 

 

 

Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.931%, 1/01/26 (a)(b)

 

 

5,000

 

 

1,872,250

 

 

 

Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.07%, 1/01/41 (b)

 

 

10,000

 

 

1,015,900

 

 

 

Tennessee Energy Acquisition Corporation, Gas Revenue Bonds, Series A, 5.25%, 9/01/26

 

 

650

 

 

572,709

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

19,867,544

 











Texas - 30.0%

 

Coppell, Texas, Independent School District, GO, Refunding, 5.643%, 8/15/30 (b)

 

 

10,030

 

 

3,423,139

 

 

 

Harris County, Texas, GO, Refunding, 5.553%, 8/15/25 (b)(g)

 

 

7,485

 

 

3,469,297

 

 

 

Harris County, Texas, GO, Refunding, 5.584%, 8/15/28 (b)(g)

 

 

10,915

 

 

4,155,886

 

 

 

Harris County, Texas, Toll Road Revenue Refunding Bonds, Senior Lien, 5%, 8/15/30 (a)

 

 

5,510

 

 

5,587,856

 

 

 

Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Junior Lien, Series H, 5.906%, 11/15/38 (b)(g)

 

 

5,785

 

 

549,806

 

 

 

Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Junior Lien, Series H, 5.921%, 11/15/39 (b)(g)

 

 

6,160

 

 

534,195

 

4


 

 

BlackRock Insured Municipal Income Trust

 

 

 

Schedule of Investments May 31, 2009 (Unaudited)

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 









State

 

Municipal Bonds

 

Par
(000)

 

Value

 









 

 

Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Third Lien, Series A-3, 5.971%, 11/15/38 (b)(g)

 

$

26,890

 

$

2,555,626

 

 

 

Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Third Lien, Series A-3, 5.981%, 11/15/39 (b)(g)

 

 

27,675

 

 

2,399,976

 

 

 

Houston, Texas, Combined Utility System, First Lien Revenue Refunding Bonds, 5%, 11/15/35 (a)

 

 

6,100

 

 

6,020,517

 

 

 

Lewisville, Texas, Independent School District, School Building, GO, Refunding, CABS, 4.671%, 8/15/24 (b)(f)(g)

 

 

5,315

 

 

2,392,122

 

 

 

Mansfield, Texas, Independent School District, GO, 5%, 2/15/33

 

 

2,980

 

 

3,048,480

 

 

 

North Texas Tollway Authority, System Revenue Refunding Bonds, CABS, First Tier, 5.312%, 1/01/29 (b)(k)

 

 

5,000

 

 

1,570,500

 

 

 

North Texas Tollway Authority, System Revenue Refunding Bonds, CABS, First Tier, 5.432%, 1/01/30 (b)(k)

 

 

1,750

 

 

512,960

 

 

 

North Texas Tollway Authority, System Revenue Refunding Bonds, First Tier, 5.75%, 1/01/40 (g)

 

 

23,050

 

 

23,219,418

 

 

 

North Texas Tollway Authority, System Revenue Refunding Bonds, First Tier, Series A, 6%, 1/01/25

 

 

750

 

 

795,360

 

 

 

San Antonio, Texas, Water System Revenue Refunding Bonds, 5.125%, 5/15/29 (f)(g)

 

 

9,250

 

 

9,377,095

 

 

 

San Antonio, Texas, Water System Revenue Refunding Bonds, 5.125%, 5/15/34 (f)(g)

 

 

10,000

 

 

10,023,600

 

 

 

Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5%, 8/15/42 (c)

 

 

28,645

 

 

24,143,438

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

103,779,271

 











Virginia - 0.1%

 

Fairfax County, Virginia, IDA, Health Care Revenue Refunding Bonds (Inova Health System Project), Series A, 5.50%, 5/15/35

 

 

400

 

 

406,428

 











Washington - 7.9%

 

Central Washington University, System Revenue Bonds, 5%, 5/01/34 (f)(g)

 

 

2,050

 

 

2,051,681

 

 

 

Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Bonds (Chelan Hydro System), AMT, Series C, 5.125%, 7/01/33 (c)

 

 

3,655

 

 

3,673,969

 

 

 

King County, Washington, Sewer Revenue Refunding Bonds, 5%, 1/01/36 (a)

 

 

2,200

 

 

2,202,354

 

 

 

Port of Seattle, Washington, Revenue Bonds, Series A, 5%, 4/01/31 (f)(g)

 

 

4,500

 

 

4,487,850

 

 

 

Washington State, GO, Series 02-A, 5%, 7/01/25 (a)

 

 

6,380

 

 

6,503,198

 

 

 

Washington State Health Care Facilities Authority Revenue Bonds (MultiCare Health System), Series C, 5.50%, 8/15/43 (k)

 

 

6,800

 

 

6,717,720

 

 

 

Washington State Health Care Facilities Authority, Revenue Refunding Bonds (MultiCare Health System), Series A, 5.50%, 8/15/38 (a)

 

 

1,700

 

 

1,694,934

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

27,331,706

 











 

 

Total Municipal Bonds - 130.1%

 

 

 

 

 

450,220,013

 











5


 

 

BlackRock Insured Municipal Income Trust

 

 

 

Schedule of Investments May 31, 2009 (Unaudited)

(Percentages shown are based on Net Assets)


 

 

 

 

 

 

 

 

 

 









State

 

Municipal Bonds Transferred to
Tender Option Bond Trusts (m)

 

Par
(000)

 

Value

 









California - 4.1%

 

San Diego County, California, Water Authority, Water Revenue Refunding Bonds, COP, Series A, 5%, 5/01/33 (a)

 

$

4,870

 

$

4,822,858

 

 

 

University of California Revenue Bonds, Series C, 4.75%, 5/15/37 (g)

 

 

10,000

 

 

9,396,400

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

14,219,258

 











Illinois - 7.0%

 

Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Bonds (McCormick Place Expansion), Series A, 5%, 12/15/28 (g)

 

 

24,010

 

 

24,271,949

 











Massachusetts - 3.9%

 

Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5%, 8/15/30 (a)

 

 

12,987

 

 

13,327,978

 











New York - 3.4%

 

Erie County, New York, IDA, School Facility Revenue Bonds (City of Buffalo Project), Series A, 5.75%, 5/01/28 (a)

 

 

4,494

 

 

4,659,126

 

 

 

Metropolitan Transportation Authority, New York, Dedicated Tax Fund Revenue Bonds, Series A, 5%, 11/15/31 (g)

 

 

7,002

 

 

7,036,393

 

 

 

 

 

 

 

 




 

 

 

 

 

 

 

 

11,695,519

 











Texas - 2.8%

 

Northside, Texas, Independent School District, GO, 5.125%, 6/15/29

 

 

9,500

 

 

9,834,751

 











Utah - 1.5%

 

Utah Transit Authority, Sales Tax Revenue Bonds, Series A, 5%, 6/15/36 (a)

 

 

5,000

 

 

5,068,900

 











Washington - 1.0%

 

Central Puget Sound Regional Transportation Authority, Washington, Sales and Use Tax Revenue Bonds, Series A, 5%, 11/01/32 (a)

 

 

3,494

 

 

3,532,461

 











 

 

Total Municipal Bonds Transferred to
Tender Option Bond Trusts - 23.7%

 

 

 

 

 

81,950,816

 











 

 

Total Long-Term Investments (Cost - $547,997,416) - 153.8%

 

 

 

 

 

532,170,829

 











 

 

Short-Term Securities

 

Shares

 

 

 

 










Money-Market Fund - 1.2%

 

FFI Institutional Tax-Exempt Fund, 0.45% (n)

 

 

4,300,000

 

 

4,300,000

 











 

 

 

 

Par
(000)

 

 

 

 










New York - 1.9%

 

New York City, New York, GO, VRDN, Sub-Series A-6, 0.20%, 6/01/09 (a)(j)(o)

 

 

6,500

 

 

6,500,000

 











 

 

Total Short-Term Securities (Cost - $10,800,000) - 3.1%

 

 

 

 

 

10,800,000

 











 

 

Total Investments (Cost - $558,797,416*) - 156.9%

 

 

 

 

 

542,970,829

 

 

 

Liabilities in Excess of Other Assets - (0.3)%

 

 

 

 

 

(1,106,926

)

 

 

Liability for Trust Certificates, Including Interest Expense and Fees Payable - (13.3)%

 

 

 

 

 

(45,868,069

)

 

 

Preferred Shares, at Redemption Value - (43.3)%

 

 

 

 

 

(149,942,190

)

 

 

 

 

 

 

 




 

 

Net Assets Applicable to Common Shares - 100.0%

 

 

 

 

$

346,053,644

 

 

 

 

 

 

 

 




6


 

BlackRock Insured Municipal Income Trust

 

Schedule of Investments May 31, 2009 (Unaudited)

 



 

 

 

 

*

The cost and unrealized appreciation (depreciation) of investments as of May 31, 2009, as computed for federal income tax purposes, were as follows:


 

 

 

 

 

 

 

Aggregate cost

 

$

509,125,829

 

 

 

 




 

Gross unrealized appreciation

 

$

18,096,970

 

 

Gross unrealized depreciation

 

 

(30,004,979

)

 

 

 




 

Net unrealized depreciation

 

$

(11,908,009

)

 

 

 





 

 

 

 

(a)

FSA Insured.

 

 

 

 

(b)

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

 

 

 

 

(c)

AMBAC Insured.

 

 

 

 

(d)

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.

 

 

 

 

(e)

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 at report date.

 

 

 

 

(f)

FGIC Insured.

 

 

 

 

(g)

NPFGC Insured.

 

 

 

 

(h)

FHLMC Collateralized.

 

 

 

 

(i)

FNMA Collateralized.

 

 

 

 

(j)

GNMA Collateralized.

 

 

 

 

(k)

Assured Guaranty Insured.

 

 

 

 

(l)

BHAC Insured.

 

 

 

 

(m)

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

 

 

 

 

(n)

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


 

 

 

 

 

 

 

 

 

 









 

Affiliate

 

Net
Activity

 

Income

 

 







 

FFI Institutional Tax-Exempt Fund

 

 

138,936

 

$

68,001

 

 










 

 

 

 

(o)

Security may have a maturity of more than one year at the time of issuance but has variable rate and demand features that qualify it as a short-term security. Rate shown is as of report date and maturity shown is the date the principal owed can be recovered through demand.

7


 

BlackRock Insured Municipal Income Trust

 

Schedule of Investments May 31, 2009 (Unaudited)



 

 

 

 

 

 

The Trust adopted Financial Accounting Standards Board Statement of Financial Accounting Standards No. 157, “Fair Value Measurements” (“FAS 157”). FAS 157 clarifies the definition of fair value, establishes a framework for measuring fair values and requires additional disclosures about the use of 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 securities

 

 

 

 

 

 

 

 

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 methodology 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, 2009 in determining the fair valuation of the Trust’s investments:


 

 

 

 

 

 

 

 






 

Valuation
Inputs

 

 

Investments in
Securities

 

 






 

 

 

 

Assets

 

 

 

 

 


 

Level 1

 

 

$

4,300,000

 

 

Level 2

 

 

 

538,670,829

 

 

Level 3

 

 

 

 

 







 

Total

 

 

$

542,970,829

 

 

 

 

 




8


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/ Donald C. Burke  
    Donald C. Burke
    Chief Executive Officer of
    BlackRock Insured Municipal Income Trust
   
  Date: July 15, 2009
   
  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/ Donald C. Burke  
    Donald C. Burke
    Chief Executive Officer (principal executive officer) of
    BlackRock Insured Municipal Income Trust
   
  Date: July 15, 2009
   
 

By:

/s/ Neal J. Andrews  
    Neal J. Andrews
    Chief Financial Officer (principal financial officer) of
    BlackRock Insured Municipal Income Trust
   
  Date: July 15, 2009