Nuveen Insured Municipal Opportunity Fund, Inc.

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM N-Q


QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number         811-06379         

        Nuveen Insured Municipal Opportunity Fund, Inc.         
(Exact name of registrant as specified in charter)


        333 West Wacker Drive, Chicago, Illinois 60606         

(Address of principal executive offices) (Zip code)


Jessica R. Droeger—Vice President and Secretary
        333 West Wacker Drive, Chicago, Illinois 60606         

(Name and address of agent for service)

Registrant's telephone number, including area code:         312-917-7700        

Date of fiscal year end:            10/31          

Date of reporting period:          01/31/05         

Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q 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 the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Item 1. Schedule of Investments

Portfolio of Investments (Unaudited)
Nuveen Insured Municipal Opportunity Fund, Inc. (NIO)
January 31, 2005


Principal

Optional Call

Market

Amount (000)

Description(1)

Provisions*

Ratings**

Value


Alabama - 15.5% (10.3% of Total Investments)

 

$

3,815

Alabama Housing Finance Authority, GNMA Collateralized Multifamily Housing Revenue Refunding Bonds,

7/05 at 103.00

Aaa

$    3,956,155

   Royal Hills Apartments, Series 1995F, 6.500%, 7/20/30

 

11,000

Birmingham Special Care Facilities Financing Authority, Alabama, Revenue Bonds, Baptist Health

5/05 at 102.00

AAA

11,305,580

   System Inc., Series 1995B, 5.875%, 11/15/20 - MBIA Insured

 

Birmingham Special Care Facilities Financing Authority, Alabama, Revenue Bonds, Baptist Health

System Inc., Series 1996A:

7,465

   5.875%, 11/15/19 - MBIA Insured

11/06 at 102.00

AAA

8,021,590

1,750

   5.875%, 11/15/26 - MBIA Insured

11/06 at 102.00

AAA

1,873,113

 

11,175

Hoover Board of Education, Alabama, Capital Outlay Tax Anticipation Warrants, Series 2001, 5.250%,

2/11 at 100.00

AAA

12,261,657

   2/15/22 - MBIA Insured

 

Jefferson County, Alabama, Sewer Revenue Refunding Warrants, Series 1997A:

25,825

   5.375%, 2/01/27 (Pre-refunded to 2/01/07) - FGIC Insured

2/07 at 100.00

AAA

27,294,701

10,195

   5.375%, 2/01/27 - FGIC Insured

2/07 at 100.00

AAA

10,647,454

 

Jefferson County, Alabama, Sewer Revenue Capital Improvement Warrants, Series 1999A:

10,815

   5.000%, 2/01/33 (Pre-refunded to 2/01/09) - FGIC Insured

2/09 at 101.00

AAA

11,799,814

9,790

   5.000%, 2/01/33 (Pre-refunded to 2/01/09) - FGIC Insured

2/09 at 101.00

AAA

10,704,778

12,000

   5.375%, 2/01/36 (Pre-refunded to 2/01/09) - FGIC Insured

2/09 at 101.00

AAA

13,290,600

29,860

   5.750%, 2/01/38 (Pre-refunded to 2/01/09) - FGIC Insured

2/09 at 101.00

AAA

33,493,066

 

18,760

Jefferson County, Alabama, Sewer Revenue Capitol Improvement Warrants, Series 2001A, 5.000%,

2/11 at 101.00

AAA

20,804,840

   2/01/41 (Pre-refunded to 2/01/11) - FGIC Insured

 

Jefferson County, Alabama, Sewer Revenue Capital Improvement Warrants, Series 2002B:

2,500

   5.125%, 2/01/42 (Pre-refunded to 8/01/12) - FGIC Insured

8/12 at 100.00

AAA

2,793,550

2,500

   5.125%, 2/01/42 (Pre-refunded to 8/01/12) - FGIC Insured

8/12 at 100.00

AAA

2,804,125

 

Jefferson County, Alabama, Sewer Revenue Capital Improvement Warrants, Series 2002D:

425

   5.000%, 2/01/38 (Pre-refunded to 8/01/12) - FGIC Insured

8/12 at 100.00

AAA

471,406

1,940

   5.000%, 2/01/38 (Pre-refunded to 8/01/12) - FGIC Insured

8/12 at 100.00

AAA

2,159,996

14,800

   5.000%, 2/01/42 (Pre-refunded to 8/01/12) - FGIC Insured

8/12 at 100.00

AAA

16,478,320

 

5,240

Jefferson County, Alabama, Sewer Revenue Refunding Warrants, Series 2003B, 5.000%, 2/01/41

2/11 at 101.00

AAA

5,829,448

   (Pre-refunded to 2/01/11) - FGIC Insured

 

6,000

University of Alabama, Tuscaloosa, General Revenue Bonds, Series 2004A, 5.000%, 7/01/29 - MBIA

7/14 at 100.00

AAA

6,315,060

   Insured


Alaska - 2.3% (1.6% of Total Investments)

 

11,245

Alaska Housing Finance Corporation, General Mortgage Revenue Bonds, Series 1999A, 6.050%,

6/09 at 100.00

AAA

11,743,941

   6/01/39 - MBIA Insured

 

11,460

Alaska Housing Finance Corporation, Governmental Purpose Bonds, Series 1995A, 5.875%, 12/01/30 -

12/05 at 102.00

AAA

11,853,995

   MBIA Insured

 

390

Alaska Housing Finance Corporation, Collateralized Veterans Mortgage Program Bonds, First Series

12/09 at 100.00

AAA

408,950

   1999A-2, 6.250%, 6/01/39 (Alternative Minimum Tax)

 

3,190

Alaska Housing Finance Corporation, Collateralized Veterans Mortgage Program Bonds, First Series

12/09 at 100.00

AAA

3,371,447

   1999A-1, 6.150%, 6/01/39

 

3,000

Alaska Student Loan Corporation, Student Loan Revenue Bonds, Series 1998A, 5.250%, 7/01/14

7/08 at 100.00

AAA

3,138,540

   (Alternative Minimum Tax) - AMBAC Insured


Arizona - 1.1% (0.8% of Total Investments)

 

Arizona State University, Certificates of Participation, Resh Infrastructure Projects, Series

2005A:

2,000

   5.000%, 9/01/25 - AMBAC Insured

3/15 at 100.00

AAA

2,146,520

2,000

   5.000%, 9/01/27 - AMBAC Insured

3/15 at 100.00

AAA

2,127,820

 

1,000

Maricopa County Union High School District 210, Phoenix, Arizona, General Obligation Bonds, Series

7/14 at 100.00

AAA

1,083,100

   2004A, 5.000%, 7/01/22 - FSA Insured

 

1,150

Phoenix Civic Improvement Corporation, Arizona, Junior Lien Wastewater System Revenue Bonds, Series

7/14 at 100.00

AAA

1,219,529

   2004, 5.000%, 7/01/27 - MBIA Insured

 

5,695

Pima County Industrial Development Authority, Arizona, Lease Obligation Revenue Refunding Bonds,

7/05 at 101.50

AAA

5,953,553

   Tucson Electric Power Company, Series 1988A, 7.250%, 7/15/10 - FSA Insured

 

2,000

Yuma County Industrial Development Authority, Arizona, Hospital Revenue Bonds, Yuma Regional

8/11 at 101.00

AAA

2,284,940

   Medical Center, Series 2001, 5.500%, 8/01/20 (Pre-refunded to 8/01/11) - FSA Insured


California - 27.5% (18.3% of Total Investments)

 

California Rural Home Mortgage Finance Authority, GNMA Mortgage-Backed Securities Program Single

Family Mortgage Revenue Bonds, Series 1996A:

105

   7.550%, 11/01/26 (Alternative Minimum Tax)

No Opt. Call

AAA

106,263

85

   7.750%, 5/01/27 (Alternative Minimum Tax)

No Opt. Call

AAA

86,051

 

4,500

California, General Obligation Bonds, Series 1998, 5.000%, 10/01/19 - FGIC Insured

10/08 at 101.00

AAA

4,826,925

 

10,000

California Department of Veterans Affairs, Home Purchase Revenue Bonds, Series 2002A, 5.300%,

6/12 at 101.00

AAA

10,760,600

   12/01/21 - AMBAC Insured

 

2,820

California Department of Water Resources, Water System Revenue Bonds, Central Valley Project,

12/14 at 100.00

AAA

2,991,879

   Series 2005AC, 5.000%, 12/01/27 - MBIA Insured

 

California Department of Water Resources, Power Supply Revenue Bonds, Series 2002A:

30,000

   5.375%, 5/01/17 - XLCA Insured

5/12 at 101.00

AAA

33,468,900

35,000

   5.375%, 5/01/18 - AMBAC Insured

5/12 at 101.00

AAA

38,929,100

 

20,000

Cucamonga County Water District, San Bernardino County, California, Certificates of Participation,

9/11 at 101.00

AAA

20,919,000

   Water Shares Purchase, Series 2000, 5.125%, 9/01/35 - FGIC Insured

 

5,000

Long Beach Bond Financing Authority, California, Lease Revenue Refunding Bonds, Long Beach Aquarium

11/11 at 101.00

AAA

5,321,800

   of the South Pacific, Series 2001, 5.250%, 11/01/30 - AMBAC Insured

 

20,000

Los Angeles Unified School District, California, General Obligation Bonds, Series 2003A, 5.000%,

7/13 at 100.00

AAA

21,617,000

   7/01/21 - FSA Insured

 

9,000

Orange County, California, Refunding Recovery Bonds, Series 1995A, 5.750%, 6/01/15 - MBIA Insured

6/05 at 102.00

AAA

9,279,900

 

12,500

Orange County, California, Recovery Certificates of Participation, Series 1996A, 6.000%, 7/01/26 -

7/06 at 102.00

AAA

13,353,500

   MBIA Insured

 

6,205

Port of Oakland, California, Revenue Bonds, Series 2002L, 5.000%, 11/01/22 (Alternative Minimum

11/12 at 100.00

AAA

6,507,059

   Tax) - FGIC Insured

 

Poway Redevelopment Agency, California, Tax Allocation Bonds, Paguay Redevelopment Project, Series

2001:

15,000

   5.200%, 6/15/30 - AMBAC Insured

12/11 at 101.00

AAA

15,879,450

5,000

   5.125%, 6/15/33 - AMBAC Insured

12/11 at 101.00

AAA

5,237,050

 

6,000

Redlands Unified School District, San Bernardino County, California, General Obligation Bonds,

7/13 at 100.00

AAA

6,343,680

   Series 2003, 5.000%, 7/01/26 - FSA Insured

 

19,300

Sacramento Power Authority, California, Revenue Bonds, Power Authority Cogeneration Project, Series

7/06 at 102.00

AAA

20,566,273

   1995, 5.875%, 7/01/15 - MBIA Insured

 

6,500

Salinas, California, GNMA Collateralized Housing Facility Revenue Refunding Bonds, Villa Serra

7/05 at 101.00

AAA

6,637,605

   Project, Series 1994A, 6.600%, 7/20/30

 

10,000

San Francisco Airports Commission, California, Revenue Bonds, San Francisco International Airport,

5/06 at 101.00

AAA

10,377,100

   Second Series Issue 13B, 5.500%, 5/01/26 (Alternative Minimum Tax) - MBIA Insured

 

13,710

San Francisco Airports Commission, California, Revenue Refunding Bonds, San Francisco International

5/11 at 100.00

AAA

14,297,885

   Airport, Second Series 2001, Issue 27A, 5.250%, 5/01/26 (Alternative Minimum Tax) - MBIA Insured

 

11,500

San Francisco Bay Area Rapid Transit District, California, Sales Tax Revenue Bonds, Series 2001,

7/11 at 100.00

AAA

12,003,700

   5.125%, 7/01/36 - AMBAC Insured

 

66,685

San Joaquin Hills Transportation Corridor Agency, Orange County, California, Senior Lien Toll Road

No Opt. Call

AAA

33,174,454

   Revenue Bonds, Series 1993, 0.000%, 1/01/21

 

San Joaquin Hills Transportation Corridor Agency, Orange County, California, Toll Road Revenue

Refunding Bonds, Series 1997A:

31,615

   5.250%, 1/15/30 - MBIA Insured

1/07 at 102.00

AAA

33,434,127

21,500

   0.000%, 1/15/32 - MBIA Insured

No Opt. Call

AAA

5,495,830

 

12,525

San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment Project,

8/10 at 101.00

AAA

13,286,395

   Series 2002, 5.000%, 8/01/20 - MBIA Insured

 

11,000

Santa Ana Financing Authority, California, Lease Revenue Bonds, Police Administration and Housing

No Opt. Call

AAA

13,757,260

   Facility, Series 1994A, 6.250%, 7/01/24 - MBIA Insured


Colorado - 7.0% (4.7% of Total Investments)

 

10,000

Denver City and County, Colorado, Airport System Revenue Refunding Bonds, Series 2001A, 5.500%,

11/11 at 100.00

AAA

11,011,400

   11/15/15 (Alternative Minimum Tax) - FGIC Insured

 

10,545

Denver City and County, Colorado, Airport System Revenue Bonds, Series 1996D, 5.500%, 11/15/25 -

11/06 at 101.00

AAA

11,123,077

   MBIA Insured

 

4,950

Denver Convention Center Hotel Authority, Colorado, Senior Revenue Bonds, Convention Center Hotel,

12/13 at 100.00

AAA

5,141,268

   Series 2003A, 5.000%, 12/01/33 - XLCA Insured

 

35,995

E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 1997B, 0.000%, 9/01/23 -

No Opt. Call

AAA

14,935,405

   MBIA Insured

 

30,800

E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000A, 5.750%, 9/01/35 -

9/10 at 102.00

AAA

34,978,944

   MBIA Insured

 

11,800

E-470 Public Highway Authority, Colorado, Senior Revenue Bonds, Series 2000B, 0.000%, 9/01/15

9/10 at 74.80

AAA

7,303,964

   (Pre-refunded to 9/01/10) - MBIA Insured

 

10,000

E-470 Public Highway Authority, Colorado, Toll Revenue Bonds, Series 2004A, 0.000%, 9/01/27 - MBIA

No Opt. Call

AAA

3,285,500

   Insured

 

1,250

Jefferson County School District R1, Colorado, General Obligation Bonds, Series 2004, 5.000%,

12/14 at 100.00

AAA

1,346,313

   12/15/24 - FSA Insured

 

2,500

Summit County School District RE-1, Colorado, General Obligation Bonds, Series 2004B, 5.000%,

12/14 at 100.00

Aaa

2,691,975

   12/01/24 - FGIC Insured


Connecticut - 0.3% (0.2% of Total Investments)

 

4,000

Connecticut, General Obligation Bonds, Series 2004D, 5.000%, 12/01/24 - MBIA Insured

12/14 at 100.00

Aaa

4,317,280


District of Columbia - 1.0% (0.7% of Total Investments)

 

2,090

District of Columbia Housing Finance Agency, GNMA Collateralized Single Family Mortgage Revenue

6/05 at 100.00

AAA

2,096,918

   Bonds, Series 1990B, 7.100%, 12/01/24 (Alternative Minimum Tax)

 

District of Columbia Water and Sewerage Authority, Subordinate Lien Public Utility Revenue Bonds,

Series 2003:

5,000

   5.125%, 10/01/24 - FGIC Insured

10/13 at 100.00

AAA

5,398,800

5,000

   5.125%, 10/01/25 - FGIC Insured

10/13 at 100.00

AAA

5,382,850


Florida - 5.1% (3.4% of Total Investments)

 

3,445

Collier County, Florida, Capital Improvement Revenue Bonds, Series 2005, 5.000%, 10/01/24 (WI,

10/14 at 100.00

AAA

3,700,171

   settling 2/02/05) - MBIA Insured

 

2,285

Florida Municipal Loan Council, Revenue Bonds, Series 2005A, 5.000%, 2/01/23 (WI, settling

2/15 at 100.00

AAA

2,459,117

   2/15/05) - MBIA Insured

 

4,425

Jacksonville Economic Development Commission, Florida, Healthcare Facilities Revenue Bonds, Mayo

11/12 at 100.00

AAA

4,907,104

   Clinic, Series 2001C, 5.500%, 11/15/36 - MBIA Insured

 

1,505

Lee County, Florida, Transportation Facilities Revenue Bonds, Series 2004B, 5.000%, 10/01/21 -

10/14 at 100.00

AAA

1,639,080

   AMBAC Insured

 

35,920

Miami-Dade County, Florida, Aviation Revenue Bonds, Miami International Airport, Series 2002,

10/12 at 100.00

AAA

37,881,950

   5.375%, 10/01/32 (Alternative Minimum Tax) - FGIC Insured

 

2,150

Miami-Dade County, Florida, Aviation Revenue Bonds, Miami International Airport, Series 2002A,

10/12 at 100.00

AAA

2,218,736

   5.125%, 10/01/35 (Alternative Minimum Tax) - FSA Insured

 

Ocala, Florida, Utility System Revenue Bonds, Series 2005B:

1,025

   5.250%, 10/01/24 - FGIC Insured

10/15 at 100.00

Aaa

1,143,326

2,590

   5.000%, 10/01/27 - FGIC Insured

10/15 at 100.00

Aaa

2,765,369

 

3,000

Orange County, Florida, Revenue Refunding Bonds, Solid Waste Facility, Series 2003, 5.000%,

10/13 at 100.00

AAA

3,287,940

   10/01/14 - MBIA Insured

 

Plantation, Florida, Non-Ad Valorem Revenue Refunding and Improvement Bonds, Series 2003:

2,010

   5.000%, 8/15/16 - FSA Insured

8/13 at 100.00

Aaa

2,205,191

2,110

   5.000%, 8/15/17 - FSA Insured

8/13 at 100.00

Aaa

2,304,394

2,225

   5.000%, 8/15/18 - FSA Insured

8/13 at 100.00

Aaa

2,429,989


Georgia - 0.9% (0.6% of Total Investments)

 

1,000

Atlanta, Georgia, Water and Wastewater Revenue Bonds, Series 2004, 5.000%, 11/01/22 - FSA Insured

11/14 at 100.00

AAA

1,082,120

 

1,520

College Park Business and Industrial Development Authority, Georgia, Public Safety Project Revenue

9/14 at 102.00

AAA

1,706,975

   Bonds, Series 2004, 5.250%, 9/01/23 - MBIA Insured

 

Fulton County Development Authority, Georgia, Revenue Bonds, Georgia Tech Molecular Science

Building, Series 2004:

1,695

   5.250%, 5/01/19 - MBIA Insured

5/14 at 100.00

AAA

1,894,196

1,135

   5.250%, 5/01/20 - MBIA Insured

5/14 at 100.00

AAA

1,265,559

 

5,000

Glynn-Brunswick Memorial Hospital Authority, Georgia, Revenue Bonds, Southeast Georgia Health

8/06 at 102.00

AAA

5,286,250

   Systems, Series 1996, 5.250%, 8/01/13 - MBIA Insured


Hawaii - 1.9% (1.3% of Total Investments)

 

24,250

Hawaii Department of Budget and Finance, Special Purpose Revenue Bonds, Hawaiian Electric Company

5/06 at 101.00

AAA

25,513,668

   Inc., Series 1996A, 6.200%, 5/01/26 (Alternative Minimum Tax) - MBIA Insured


Idaho - 0.2% (0.0% of Total Investments)

 

855

Idaho Housing Agency, Single Family Mortgage Senior Bonds, Series 1994B-1, 6.750%, 7/01/22

No Opt. Call

Aa1

867,834

 

770

Idaho Housing Agency, Single Family Mortgage Senior Bonds, Series 1994B-2, 6.900%, 7/01/26

No Opt. Call

Aa1

811,064

   (Alternative Minimum Tax)

 

930

Idaho Housing Agency, Single Family Mortgage Senior Bonds, Series 1995B, 6.600%, 7/01/27

7/05 at 102.00

Aaa

949,456

   (Alternative Minimum Tax)


Illinois - 7.4% (5.0% of Total Investments)

 

1,050

Bedford Park, Illinois, General Obligation Bonds, Series 2004A, 5.250%, 12/15/20 - FSA Insured

12/14 at 100.00

AAA

1,177,523

 

12,500

Chicago, Illinois, General Airport Second Lien Revenue Refunding Bonds, O'Hare International

7/05 at 101.00

AAA

12,645,250

   Airport, Series 1993C, 5.000%, 1/01/18 - MBIA Insured

 

Chicago, Illinois, Second Lien Passenger Facility Charge Revenue Refunding Bonds, O'Hare

International Airport, Series 2001E:

4,615

   5.500%, 1/01/17 (Alternative Minimum Tax) - AMBAC Insured

1/11 at 101.00

AAA

5,065,286

4,870

   5.500%, 1/01/18 (Alternative Minimum Tax) - AMBAC Insured

1/11 at 101.00

AAA

5,344,630

 

5,000

DuPage and Will Counties Community School District 204 - Indian Prairie, Illinois, General

12/11 at 100.00

AAA

5,401,250

   Obligation Bonds, Series 2001, 5.000%, 12/30/15 - FGIC Insured

 

5,455

Eastern Illinois University, Auxiliary Facilities System Revenue Bonds, Series 1989, 0.000%,

4/05 at 76.71

AAA

4,165,874

   10/01/09 - MBIA Insured

 

10,000

Illinois Development Finance Authority, Revenue Bonds, Provena Health, Series 1998A, 5.500%,

5/08 at 101.00

AAA

10,822,700

   5/15/21 - MBIA Insured

 

2,095

Illinois Educational Facilities Authority, Revenue Bonds, Robert Morris College, Series 2000,

12/07 at 100.00

Aaa

2,264,360

   5.800%, 6/01/30 - MBIA Insured

 

2,180

Illinois Educational Facilities Authority, Revenue Bonds, DePaul University, Series 2000, 5.500%,

10/10 at 101.00

AAA

2,478,551

   10/01/19 (Pre-refunded to 10/01/10) - AMBAC Insured

 

7,000

Illinois Health Facilities Authority, Revenue Bonds, Hospital Sisters Services Inc. Obligated

6/08 at 101.00

Aaa

7,429,450

   Group, Series 1998A, 5.000%, 6/01/18 - MBIA Insured

 

4,500

Illinois Health Facilities Authority, Revenue Bonds, Alexian Brothers Health System, Series 1999,

1/09 at 101.00

AAA

4,758,750

   5.000%, 1/01/19 - FSA Insured

 

22,410

Illinois, General Obligation Bonds, Illinois FIRST Program, Series 2002, 5.125%, 2/01/27 - FGIC

2/12 at 100.00

AAA

23,640,757

   Insured

 

4,560

Macon County, Illinois, Revenue Bonds, Millikin University, Series 1995, 6.250%, 10/01/16

10/05 at 100.00

AAA

4,684,944

   (Pre-refunded to 10/01/05) - AMBAC Insured

 

Schaumburg, Illinois, General Obligation Bonds, Series 2004B:

4,260

   5.000%, 12/01/22 - FGIC Insured

12/14 at 100.00

AAA

4,594,325

2,365

   5.000%, 12/01/23 - FGIC Insured

12/14 at 100.00

AAA

2,542,635


Indiana - 4.0% (2.7% of Total Investments)

 

2,030

Decatur Township-Marion County Multi-School Building Corporation, Indiana, First Mortgage Bonds,

7/13 at 100.00

AAA

2,199,383

   Series 2003, 5.000%, 7/15/20 - FGIC Insured

 

11,000

Indiana Health Facility Financing Authority, Hospital Revenue Bonds, Daughters of Charity, Series

5/06 at 100.00

Aaa

11,139,480

   1993, 5.750%, 11/15/22

 

4,035

Indiana State Office Building Commission, Revenue Bonds, Indiana State Museum, Series 2004C,

No Opt. Call

AAA

4,569,557

   5.250%, 7/01/15 - FGIC Insured

 

3,250

Indianapolis Local Public Improvement Bond Bank, Indiana, Waterworks Project, Series 2002A,

7/12 at 100.00

AAA

3,479,743

   5.250%, 7/01/33 - MBIA Insured

 

20,000

Indianapolis Local Public Improvement Bond Bank, Indiana, Series 1999E, 0.000%, 2/01/28 - AMBAC

No Opt. Call

AAA

6,388,400

   Insured

 

1,340

Monroe-Gregg Grade School Building Corporation, Morgan County, Indiana, First Mortgage Bonds,

1/14 at 100.00

AAA

1,419,810

   Series 2004, 5.000%, 1/15/25 - FSA Insured

 

Noblesville Redevelopment Authority, Indiana, Economic Development Lease Rental Bonds, Exit 10

Project, Series 2003:

3,110

   5.000%, 1/15/21 - AMBAC Insured

7/13 at 100.00

AAA

3,330,033

5,000

   5.000%, 1/15/28 - AMBAC Insured

7/13 at 100.00

AAA

5,226,000

 

10,000

Purdue University, Indiana, Student Fee Bonds, Series 2002O, 5.000%, 7/01/19 - MBIA Insured

1/12 at 100.00

AAA

10,856,500

 

3,705

Whitley County Middle School Building Corporation, Columbia City, Indiana, First Mortgage Bonds,

7/13 at 100.00

AAA

4,060,384

   Series 2003, 5.000%, 7/15/16 - FSA Insured


Iowa - 0.3% (0.2% of Total Investments)

 

3,045

Ames, Iowa, Hospital Revenue Refunding Bonds, Mary Greeley Medical Center, Series 2003, 5.000%,

6/13 at 100.00

Aaa

3,314,361

   6/15/15 - AMBAC Insured


Kansas - 0.7% (0.5% of Total Investments)

 

1,055

Butler County Unified School District 394, Kansas, General Obligation Bonds, Series 2004, 5.000%,

9/14 at 100.00

AAA

1,150,994

   9/01/20 - FSA Insured

 

2,055

Kansas State Turnpike Authority, Revenue Bonds, Series 2004A-2, 5.000%, 9/01/23 - FSA Insured

9/14 at 101.00

AAA

2,230,394

 

5,000

University of Kansas Hospital Authority, Health Facilities Revenue Bonds, KU Health System, Series

9/09 at 100.00

AAA

5,475,350

   1999A, 5.650%, 9/01/29 - AMBAC Insured


Kentucky - 1.4% (1.0% of Total Investments)

 

3,870

Kenton County School District Finance Corporation, Kentucky, School Building Revenue Bonds, Series

6/14 at 100.00

Aaa

4,208,045

   2004, 5.000%, 6/01/20 - MBIA Insured

 

12,980

Louisville and Jefferson County Metropolitan Sewer District, Kentucky, Sewer and Drainage System

11/11 at 101.00

AAA

14,482,565

   Revenue Bonds, Series 2001A, 5.500%, 5/15/34 - MBIA Insured


Louisiana - 1.6% (1.1% of Total Investments)

 

5,000

De Soto Parish, Louisiana, Pollution Control Revenue Refunding Bonds, Cleco Utility Group Inc.

9/09 at 102.00

AAA

5,656,900

   Project, Series 1999, 5.875%, 9/01/29 - AMBAC Insured

 

3,025

Lafayette City and Parish, Louisiana, Utilities Revenue Bonds, Series 2004, 5.250%, 11/01/22 -

11/14 at 100.00

AAA

3,367,672

   MBIA Insured

 

1,640

Louisiana Public Facilities Authority, Revenue Bonds, Baton Rouge General Hospital, Series 2004,

7/14 at 100.00

AAA

1,784,714

   5.250%, 7/01/24 - MBIA Insured

 

6,895

Orleans Levee District, Louisiana, Levee District General Obligation Bonds, Series 1986, 5.950%,

12/05 at 103.00

AAA

7,300,150

   11/01/15 - FSA Insured

 

3,000

St. Charles Parish, Louisiana, Pollution Control Revenue Bonds, Louisiana Power and Light Company,

6/05 at 100.00

AAA

3,099,300

   Series 1991, 7.500%, 6/01/21 (Alternative Minimum Tax) - FSA Insured


Maine - 0.2% (0.2% of Total Investments)

 

3,000

Maine Health and Higher Educational Facilities Authority, Revenue Bonds, Series 2003B, 5.000%,

7/13 at 100.00

AAA

3,139,320

   7/01/28 - FSA Insured


Massachusetts - 6.6% (4.4% of Total Investments)

 

22,500

Massachusetts Development Finance Authority, Revenue Bonds, WGBH Educational Foundation, Series

1/12 at 101.00

AAA

24,302,475

   2002A, 5.375%, 1/01/42 - AMBAC Insured

 

8,400

Massachusetts Health and Educational Facilities Authority, Revenue Bonds, Berkshire Health Systems,

10/05 at 102.00

AAA

8,762,376

   Series 1995D, 6.000%, 10/01/13 - MBIA Insured

 

1,105

Massachusetts Housing Finance Agency, Housing Revenue Refunding Bonds, Series 1995A, 6.100%,

12/05 at 102.00

AAA

1,143,476

   12/01/16 - MBIA Insured

 

15,000

Massachusetts, Special Obligation Dedicated Tax Revenue Bonds, Series 2004, 5.250%, 1/01/23 - FGIC

1/14 at 100.00

AAA

16,542,000

   Insured

 

33,315

Massachusetts Turnpike Authority, Metropolitan Highway System Revenue Bonds, Senior Series 1997A,

1/07 at 102.00

AAA

34,007,619

   5.000%, 1/01/37 - MBIA Insured

 

1,500

University of Massachusetts Building Authority, Senior Lien Project Revenue Bonds, Series 2004-1,

11/14 at 100.00

AAA

1,698,090

   5.375%, 11/01/20 - AMBAC Insured


Michigan - 7.3% (4.9% of Total Investments)

 

6,000

Detroit, Michigan, General Obligation Bonds, Series 2001A-1, 5.375%, 4/01/18 - MBIA Insured

10/11 at 100.00

AAA

6,705,060

 

5,490

Detroit City School District, Wayne County, Michigan, Unlimited Tax School Building and Site

No Opt. Call

AAA

6,852,893

   Improvement Bonds, Series 2001A, 6.000%, 5/01/29 - FSA Insured

 

Detroit, Michigan, Sewerage Disposal System Revenue Bonds, Series 1999A:

15,825

   5.750%, 7/01/26 (Pre-refunded to 1/01/10) - FGIC Insured

1/10 at 101.00

AAA

17,995,241

20,000

   5.875%, 7/01/27 (Pre-refunded to 1/01/10) - FGIC Insured

1/10 at 101.00

AAA

22,856,400

 

8,700

Detroit, Michigan, Senior Lien Water Supply System Revenue Bonds, Series 1997A, 5.000%, 7/01/27 -

7/07 at 101.00

AAA

9,106,464

   MBIA Insured

 

8,000

Gaylord Community Schools, Otsego and Antrim Counties, Michigan, School Building and Site Refunding

5/07 at 37.75

AAA

2,851,760

   Bonds, Series 1992, 0.000%, 5/01/21 (Pre-refunded to 5/01/07) - MBIA Insured

 

Grand Rapids Community College, Kent County, Michigan, General Obligation Refunding Bonds, Series

2003:

1,050

   5.250%, 5/01/17 - AMBAC Insured

5/13 at 100.00

AAA

1,170,109

1,085

   5.250%, 5/01/20 - AMBAC Insured

5/13 at 100.00

AAA

1,203,569

 

27,000

Okemos Public School District, Ingham County, Michigan, School Building and Site Bonds, Series

5/06 at 34.54

AAA

9,071,730

   1991I, 0.000%, 5/01/21 (Pre-refunded to 5/01/06) - MBIA Insured

 

10,000

Wayne County, Michigan, Limited Tax General Obligation Airport Hotel Revenue Bonds, Detroit

12/11 at 101.00

AAA

10,961,800

   Metropolitan Wayne County Airport, Series 2001A, 5.250%, 12/01/25 - MBIA Insured

 

6,850

Wayne County, Michigan, Airport Revenue Bonds, Detroit Metropolitan Wayne County Airport, Series

12/08 at 101.00

AAA

7,337,309

   1998A, 5.375%, 12/01/15 (Alternative Minimum Tax) - MBIA Insured


Minnesota - 1.1% (0.7% of Total Investments)

 

13,020

St. Paul Housing and Redevelopment Authority, Minnesota, GNMA Collateralized Multifamily Housing

12/11 at 102.00

Aaa

14,009,780

   Revenue Bonds, Marian Center Project, Series 2001A, 6.450%, 6/20/43


Nebraska - 0.2% (0.1% of Total Investments)

 

Nebraska Public Power District, General Revenue Bonds, Series 2005A:

1,000

   5.000%, 1/01/24 - FSA Insured

1/15 at 100.00

AAA

1,076,500

1,000

   5.000%, 1/01/25 - FSA Insured

1/15 at 100.00

AAA

1,071,430


Nevada - 8.1% (5.4% of Total Investments)

 

12,105

Clark County, Nevada, General Obligation Bank Bonds, Southern Nevada Water Authority Loan, Series

12/12 at 100.00

AAA

12,552,764

   2002, 5.000%, 6/01/32 - MBIA Insured

 

7,370

Clark County, Nevada, Subordinate Lien Airport Revenue Bonds, Series 2004A-2, 5.125%, 7/01/25 -

7/14 at 100.00

AAA

7,894,891

   FGIC Insured

 

Director of Nevada State Department of Business and Industry, Revenue Bonds, Las Vegas Monorail

Project, First Tier, Series 2000:

15,000

   5.625%, 1/01/34 - AMBAC Insured

1/10 at 102.00

AAA

16,666,350

13,000

   5.375%, 1/01/40 - AMBAC Insured

1/10 at 100.00

AAA

13,767,650

 

530

Nevada Housing Division, Single Family Mortgage Bonds, Senior Series 1994B-1, 6.700%, 10/01/17

4/05 at 101.00

Aa2

541,443

 

410

Nevada Housing Division, Single Family Mortgage Bonds, Senior Series 1994B-2, 6.950%, 10/01/26

4/05 at 101.00

Aa2

412,882

   (Alternative Minimum Tax)

 

40,285

Reno, Nevada, Capital Improvement Revenue Bonds, Series 2002, 5.375%, 6/01/32 - FGIC Insured

6/12 at 100.00

AAA

43,647,992

 

10,000

Reno, Nevada, Senior Lien Sales and Room Tax Revenue Bonds, Reno Transportation Rail Access

6/12 at 100.00

AAA

10,532,200

   Corridor Project, Series 2002, 5.125%, 6/01/27 - AMBAC Insured


New Jersey - 1.8% (1.2% of Total Investments)

 

Essex County Improvement Authority, New Jersey, Guaranteed Revenue Bonds, Project Consolidation,

Series 2004:

2,000

   5.125%, 10/01/21 - MBIA Insured

10/14 at 100.00

Aaa

2,189,720

2,250

   5.125%, 10/01/22 - MBIA Insured

10/14 at 100.00

Aaa

2,452,095

 

New Jersey Economic Development Authority, Revenue Bonds, Motor Vehicle Surcharge, Series 2004A:

3,850

   5.000%, 7/01/22 - MBIA Insured

7/14 at 100.00

AAA

4,154,189

3,850

   5.000%, 7/01/23 - MBIA Insured

7/14 at 100.00

AAA

4,141,676

 

2,120

New Jersey Educational Facilities Authority, Revenue Bonds, Ramapo College, Series 2004E, 5.000%,

7/14 at 100.00

AAA

2,297,910

   7/01/21 - FGIC Insured

 

5,000

New Jersey Turnpike Authority, Revenue Bonds, Series 2003A, 5.000%, 1/01/19 - FGIC Insured

7/13 at 100.00

AAA

5,425,600

 

2,795

Rutgers State University, New Jersey, Revenue Bonds, Series 2004E, 5.000%, 5/01/22 - FGIC Insured

5/14 at 100.00

AAA

3,012,535


New York - 6.1% (4.1% of Total Investments)

 

8,685

Long Island Power Authority, New York, Electric System General Revenue Bonds, Series 1998A,

6/08 at 101.00

AAA

9,446,501

   5.300%, 12/01/19 - FSA Insured

 

Metropolitan Transportation Authority, New York, State Service Contract Refunding Bonds, Series

2002A:

2,500

   5.000%, 7/01/21 - FGIC Insured

7/12 at 100.00

AAA

2,704,825

5,000

   5.000%, 7/01/25 - FGIC Insured

7/12 at 100.00

AAA

5,338,150

 

15,000

New York City Municipal Water Finance Authority, New York, Water and Sewerage System Revenue Bonds,

6/06 at 101.00

AAA

15,634,200

   Fiscal Series 1997A, 5.375%, 6/15/26 - FSA Insured

 

New York City Municipal Water Finance Authority, New York, Water and Sewerage System Revenue Bonds,

Fiscal Series 1996B:

3,520

   5.750%, 6/15/26 (Pre-refunded to 6/15/06) - MBIA Insured

6/06 at 101.00

AAA

3,717,965

6,480

   5.750%, 6/15/26 - MBIA Insured

6/06 at 101.00

AAA

6,843,528

 

1,880

Dormitory Authority of the State of New York, FHA-Insured Mortgage Revenue Bonds, Montefiore

2/15 at 100.00

AAA

2,024,873

   Hospital, Series 2004, 5.000%, 8/01/23 - FGIC Insured

 

5,000

New York State Urban Development Corporation, Correctional Capital Facilities Revenue Bonds, Series

1/07 at 102.00

AAA

5,408,150

   1996-7, 5.700%, 1/01/27 (Pre-refunded to 1/01/07) - MBIA Insured

 

New York State Urban Development Corporation, State Personal Income Tax, Revenue Bonds, Series

2004A-1:

1,000

   5.000%, 3/15/23 - FGIC Insured

3/14 at 100.00

AAA

1,075,360

5,000

   5.000%, 3/15/25 - FGIC Insured

3/14 at 100.00

AAA

5,333,500

 

New York City Sales Tax Asset Receivable Corporation, New York, Dedicated Revenue Bonds, Local

Government Assistance Corporation, Series 2004A:

4,825

   5.000%, 10/15/24 - MBIA Insured

10/14 at 100.00

AAA

5,195,560

1,665

   5.000%, 10/15/25 - MBIA Insured

10/14 at 100.00

AAA

1,784,580

 

15,000

Triborough Bridge and Tunnel Authority, New York, Subordinate Lien General Purpose Revenue

11/12 at 100.00

AAA

15,622,200

   Refunding Bonds, Series 2002E, 5.000%, 11/15/32 - MBIA Insured


North Carolina - 0.8% (0.5% of Total Investments)

 

Mooresville, North Carolina, Enterprise System Revenue Bonds, Series 2004:

2,115

   5.000%, 5/01/22 - FGIC Insured

5/14 at 100.00

AAA

2,284,708

2,575

   5.000%, 5/01/26 - FGIC Insured

5/14 at 100.00

AAA

2,736,453

 

5,000

North Carolina Municipal Power Agency 1, Catawba Electric Revenue Bonds, Series 2003A, 5.250%,

1/13 at 100.00

AAA

5,567,400

   1/01/16 - FSA Insured


Ohio - 2.6% (1.7% of Total Investments)

 

2,650

Cleveland State University, Ohio, General Receipts Bonds, Series 2004, 5.250%, 6/01/24 - FGIC

6/14 at 100.00

AAA

2,926,395

   Insured

 

2,000

Columbus City School District, Franklin County, Ohio, General Obligation Bonds, Series 2004,

12/14 at 100.00

AAA

2,209,200

   5.250%, 12/01/25 - FSA Insured

 

2,385

Columbus, Ohio, Tax Increment Financing Bonds, Easton Project, Series 2004A, 5.000%, 12/01/22 -

6/14 at 100.00

AAA

2,556,648

   AMBAC Insured

 

20,100

Lucas County, Ohio, Hospital Revenue Bonds, ProMedica Healthcare Obligated Group, Series 1999,

11/09 at 101.00

AAA

21,636,243

   5.375%, 11/15/39 - AMBAC Insured

 

1,320

Ohio Housing Finance Agency, GNMA Mortgage-Backed Securities Program Residential Mortgage Revenue

3/05 at 102.00

Aaa

1,323,986

   Bonds, Series 1995A-2, 6.625%, 3/01/26 (Alternative Minimum Tax)

 

3,000

Ross Local School District Board of Education, Butler County, Ohio, General Obligation Bonds,

12/13 at 100.00

Aaa

3,158,460

   Series 2003, 5.000%, 12/01/28 - FSA Insured


Oklahoma - 1.4% (0.9% of Total Investments)

 

6,710

Oklahoma Housing Finance Agency, GNMA Collateralized Single Family Mortgage Revenue Bonds, Series

No Opt. Call

AAA

6,950,084

   1987A, 7.997%, 8/01/18 (Alternative Minimum Tax)

 

5,245

Oklahoma State Industries Authority, Revenue Bonds, Oklahoma Medical Research Foundation, Series

2/11 at 100.00

Aaa

5,708,553

   2001, 5.250%, 2/01/21 - AMBAC Insured

 

4,880

University of Oklahoma, Student Housing Revenue Bonds, Series 2004, 5.000%, 7/01/22 - AMBAC

7/14 at 100.00

Aaa

5,273,523

   Insured


Oregon - 0.1% (0.1% of Total Investments)

 

1,745

Oregon Housing and Community Services Department, Single Family Mortgage Revenue Bonds, Series

7/05 at 102.00

Aa2

1,789,602

   1995A, 6.450%, 7/01/26 (Alternative Minimum Tax)


Puerto Rico - 0.2% (0.1% of Total Investments)

 

2,000

Puerto Rico Highway and Transportation Authority, Highway Revenue Bonds, Series 2003G, 5.250%,

7/13 at 100.00

AAA

2,242,200

   7/01/19 - FGIC Insured


Rhode Island - 2.0% (1.4% of Total Investments)

 

2,195

Providence Housing Development Corporation, Rhode Island, FHA-Insured Mortgage Revenue Refunding

7/05 at 101.00

AAA

2,241,929

   Bonds, Barbara Jordan Apartments, Series 1994A, 6.750%, 7/01/25 - MBIA Insured

 

20,475

Rhode Island Depositors Economic Protection Corporation, Special Obligation Refunding Bonds, Series

2/11 at 100.00

AAA

22,886,136

   1993B, 5.250%, 8/01/21 (Pre-refunded to 2/01/11) - MBIA Insured

 

1,405

Rhode Island Health and Educational Building Corporation, HIgher Education Auxiliary Enterprise

9/14 at 100.00

Aaa

1,585,655

   Revenue Bonds, Series 2004A, 5.500%, 9/15/24 - AMBAC Insured


South Carolina - 4.1% (2.7% of Total Investments)

 

10,000

Beaufort County, South Carolina, Tax Increment Bonds, New River Redevelopment Project, Series 2002,

12/12 at 100.00

AAA

10,484,500

   5.000%, 6/01/27 - MBIA Insured

 

Medical University Hospital Authority, South Carolina, FHA-Insured Mortgage Revenue Bonds, Series

2004A:

2,000

   5.250%, 8/15/22 - MBIA Insured

8/14 at 100.00

AAA

2,189,960

2,105

   5.250%, 8/15/23 - MBIA Insured

8/14 at 100.00

AAA

2,297,965

 

Piedmont Municipal Power Agency, South Carolina, Electric Revenue Bonds, Series 1988A:

9,190

   0.000%, 1/01/13 (Pre-refunded to 7/01/09) - AMBAC Insured

7/09 at 76.63

AAA

6,158,679

4,855

   0.000%, 1/01/13 - AMBAC Insured

No Opt. Call

AAA

3,442,049

7,955

   0.000%, 1/01/13 - AMBAC Insured

No Opt. Call

AAA

5,586,399

 

South Carolina JOBS Economic Development Authority, Hospital Revenue Bonds, Oconee Memorial

Hospital Inc., Series 1995:

3,000

   6.150%, 3/01/15 - CONNIE LEE/AMBAC Insured

3/05 at 102.00

AAA

3,068,520

600

   6.150%, 3/01/25 - CONNIE LEE/AMBAC Insured

3/05 at 102.00

AAA

613,722

 

8,000

South Carolina Jobs Economic Development Authority, Industrial Revenue Bonds, South Carolina

11/12 at 100.00

AAA

8,579,840

   Electric and Gas Company, Series 2002A, 5.200%, 11/01/27 - AMBAC Insured

 

10,000

South Carolina Jobs Economic Development Authority, Industrial Revenue Bonds, South Carolina

11/12 at 100.00

AAA

10,647,400

   Electric and Gas Company, Series 2002B, 5.450%, 11/01/32 (Alternative Minimum Tax) - AMBAC Insured


Tennessee - 0.5% (0.4% of Total Investments)

 

6,455

Memphis-Shelby County Airport Authority, Tennessee, Airport Revenue Bonds, Series 2001A, 5.500%,

3/11 at 100.00

AAA

7,062,286

   3/01/18 (Alternative Minimum Tax) - FSA Insured


Texas - 18.9% (12.6% of Total Investments)

 

Austin, Texas, General Obligation Bonds, Series 2002:

2,150

   5.375%, 9/01/18 - MBIA Insured

9/12 at 100.00

AAA

2,407,291

2,250

   5.375%, 9/01/19 - MBIA Insured

9/12 at 100.00

AAA

2,513,070

 

22,650

Brazos River Authority, Texas, Revenue Refunding Bonds, Houston Industries Inc., Series 1998C,

5/08 at 102.00

AAA

24,391,785

   5.125%, 5/01/19 (Optional put 5/01/08) - AMBAC Insured

 

1,127

Capital Area Housing Finance Corporation, Texas, FNMA Backed Single Family Mortgage Revenue

4/12 at 106.00

AAA

1,226,927

   Refunding Bonds, Series 2002A-2, 6.300%, 4/01/35 (Alternative Minimum Tax) - AMBAC Insured

 

11,460

Dallas County Utility and Reclamation District, Texas, Unlimited Tax General Obligation Refunding

3/05 at 100.00

AAA

11,676,021

   Bonds, Series 1999B, 5.875%, 2/15/29 (Pre-refunded to 3/15/05) - AMBAC Insured

 

12,500

Dallas-Ft. Worth International Airport, Texas, Joint Revenue Bonds, Series 2000A, 6.125%, 11/01/35

11/09 at 100.00

AAA

13,911,000

   (Alternative Minimum Tax) - FGIC Insured

 

25,000

Harris County-Houston Sports Authority, Texas, Junior Lien Revenue Refunding Bonds, Series 2001B,

11/11 at 100.00

AAA

26,141,250

   5.250%, 11/15/40 - MBIA Insured

 

Harris County, Texas, Toll Road Senior Lien Revenue Bonds, Series 1989:

9,000

   0.000%, 8/15/18 (Pre-refunded to 8/15/09) - AMBAC Insured

8/09 at 53.84

AAA

4,214,970

39,000

   0.000%, 8/15/19 (Pre-refunded to 8/15/09) - AMBAC Insured

8/09 at 50.26

AAA

17,050,410

7,280

   0.000%, 8/15/20 (Pre-refunded to 8/15/09) - AMBAC Insured

8/09 at 46.91

AAA

2,971,114

5,085

   0.000%, 8/15/21 (Pre-refunded to 8/15/09) - AMBAC Insured

8/09 at 43.80

AAA

1,937,283

 

2,130

Harris County Health Facilities Development Corporation, Texas, Thermal Utility Revenue Bonds, TECO

11/13 at 100.00

AAA

2,321,508

   Project, Series 2003, 5.000%, 11/15/15 - MBIA Insured

 

6,570

Houston, Texas, General Obligation Public Improvement Bonds, Series 2001A, 5.375%, 3/01/19 - FSA

3/11 at 100.00

AAA

7,269,836

   Insured

 

4,170

Houston, Texas, Subordinate Lien Airport System Revenue Bonds, Series 2000B, 5.500%, 7/01/30 - FSA

7/10 at 100.00

AAA

4,560,938

   Insured

 

8,225

Houston, Texas, Subordinate Lien Airport System Revenue Refunding Bonds, Series 1997, 5.125%,

7/07 at 100.00

AAA

8,617,579

   7/01/22 - FGIC Insured

 

17,500

Houston, Texas, Hotel Occupancy Tax and Special Revenue Bonds, Convention and Entertainment

9/11 at 100.00

AAA

18,568,375

   Project, Series 2001B, 5.250%, 9/01/33 - AMBAC Insured

 

12,826

Houston Housing Finance Corporation, Texas, GNMA Collateralized Mortgage Multifamily Housing

9/11 at 105.00

Aaa

13,686,881

   Revenue Bonds, RRG Apartments Project, Series 2001, 6.350%, 3/20/42

 

Houston, Texas, First Lien Combined Utility System Revenue Bonds, Series 2004A:

4,000

   5.250%, 5/15/24 - FGIC Insured

5/14 at 100.00

AAA

4,392,640

5,000

   5.250%, 5/15/25 - MBIA Insured

5/14 at 100.00

AAA

5,458,300

 

23,865

Jefferson County Health Facilities Development Corporation, Texas, FHA-Insured Mortgage Revenue

8/11 at 100.00

AAA

25,963,688

   Bonds, Baptist Hospital of Southeast Texas, Series 2001, 5.500%, 8/15/41 - AMBAC Insured

 

8,205

Lower Colorado River Authority, Texas, Revenue Refunding and Improvement Bonds, Series 2001A,

5/11 at 100.00

AAA

8,673,095

   5.000%, 5/15/21 - MBIA Insured

 

Port of Houston Authority, Harris County, Texas, General Obligation Port Improvement Bonds, Series

2001B:

3,205

   5.500%, 10/01/18 (Alternative Minimum Tax) - FGIC Insured

10/11 at 100.00

AAA

3,535,948

3,375

   5.500%, 10/01/19 (Alternative Minimum Tax) - FGIC Insured

10/11 at 100.00

AAA

3,723,502

 

7,205

San Antonio, Texas, Airport System Improvement Revenue Bonds, Series 2001, 5.375%, 7/01/15

7/11 at 101.00

AAA

7,822,829

   (Alternative Minimum Tax) - FGIC Insured

 

Tarrant County Health Facilities Development Corporation, Texas, Revenue Bonds, Texas Health

Resources System, Series 1997A:

2,900

   5.250%, 2/15/22 - MBIA Insured

2/08 at 102.00

AAA

3,111,816

6,820

   5.000%, 2/15/26 - MBIA Insured

2/08 at 101.00

AAA

7,008,573

 

8,715

Texas Department of Housing and Community Affairs, Single Family Mortgage Revenue Bonds, Series

9/06 at 102.00

AAA

9,030,832

   1996D, 6.250%, 9/01/28 (Alternative Minimum Tax) - MBIA Insured

 

1,910

Waco, Texas, Combined Tax and Revenue Certificates of Obligation, Series 2004, 5.000%, 2/01/21 -

2/14 at 100.00

AAA

2,056,917

   MBIA Insured

 

1,840

Ysleta Independent School District Public Facility Corporation, Texas, Lease Revenue Refunding

11/09 at 100.00

AAA

2,006,465

   Bonds, Series 2001, 5.375%, 11/15/24 - AMBAC Insured


Utah - 1.2% (0.8% of Total Investments)

 

2,000

Clearfield City, Utah, Sales Tax Revenue Bonds, Series 2003, 5.000%, 7/01/28 - FGIC Insured

7/13 at 100.00

AAA

2,094,320

 

10,000

Intermountain Power Agency, Utah, Power Supply Revenue Refunding Bonds, Series 2003A, 5.000%,

7/13 at 100.00

AAA

10,955,300

   7/01/16 - FSA Insured

 

2,200

Utah Housing Finance Agency, FHA-Insured Section 8 Assisted Multifamily Housing Revenue Bonds,

7/05 at 100.00

AA

2,203,476

   Series 1992A, 7.400%, 7/01/24


Virginia - 1.6% (1.1% of Total Investments)

 

1,035

Loudoun County Industrial Development Authority, Virginia, Public Safety Facilities Lease Revenue

6/14 at 100.00

AAA

1,151,924

   Bonds, Series 2003A, 5.250%, 12/15/20 - FSA Insured

 

4,840

Metropolitan Washington D.C. Airports Authority, Airport System Revenue Bonds, Series 2001A,

10/11 at 101.00

AAA

5,335,374

   5.500%, 10/01/19 (Alternative Minimum Tax) - MBIA Insured

 

4,265

Metropolitan Washington D.C. Airports Authority, Airport System Revenue Bonds, Series 2004A,

10/14 at 100.00

AAA

4,619,933

   5.000%, 10/01/20 - MBIA Insured

 

10,000

Virginia Housing Development Authority, Commonwealth Mortgage Bonds, Series 2001H-1, 5.375%,

7/11 at 100.00

AAA

10,189,500

   7/01/36 - MBIA Insured


Washington - 1.8% (1.2% of Total Investments)

 

2,500

Grant County Public Utility District 2, Washington, Revenue Bonds, Wanapum Hydroelectric

1/15 at 100.00

AAA

2,614,300

   Development, Series 2005A, 5.000%, 1/01/29 (WI, settling 2/01/05) - FGIC Insured

 

3,500

King County School District 401, Highline, Washington, General Obligation Bonds, Series 2004,

12/14 at 100.00

AAA

3,745,315

   5.000%, 10/01/24 - FGIC Insured

 

4,000

King County School District 414, Lake Washington, Washington, General Obligation Bonds, Series

12/14 at 100.00

AAA

4,420,680

   2004, 5.000%, 12/01/15 - FSA Insured

 

3,195

Kitsap County, Washington, Limited Tax General Obligation Bonds, Series 2000, 5.500%, 7/01/25 -

7/10 at 100.00

AAA

3,497,822

   AMBAC Insured

 

4,250

Snohomish County Public Utility District 1, Washington, Generation System Revenue Bonds, Series

7/05 at 100.00

AAA

5,217,385

   1989, 6.650%, 1/01/16 - FGIC Insured

 

4,345

Washington State Public Power Supply System, Nuclear Project 1 Revenue Refunding Bonds, Series

7/07 at 102.00

AAA

4,649,498

   1997A, 5.125%, 7/01/17 - AMBAC Insured


West Virginia - 0.8% (0.5% of Total Investments)

 

10,000

Harrison County Commission, West Virginia, Solid Waste Disposal Revenue Bonds, West Penn Power

5/05 at 100.00

AAA

10,091,800

   Company - Harrison Station, Series 1993B, 6.300%, 5/01/23 (Alternative Minimum Tax) - MBIA Insured


Wisconsin - 3.9% (2.6% of Total Investments)

 

680

Wisconsin Housing and Economic Development Authority, Housing Revenue Bonds, Series 1992A, 6.850%,

7/05 at 100.00

AAA

681,149

   11/01/12 - MBIA Insured

 

2,890

Wisconsin, General Obligation Bonds, Series 2004-3, 5.250%, 5/01/20 - FGIC Insured

5/14 at 100.00

AAA

3,217,664

 

10,945

Wisconsin, General Obligation Bonds, Series 2004-4, 5.000%, 5/01/20 - MBIA Insured

5/14 at 100.00

AAA

11,876,201

 

15,000

Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Marshfield Clinic, Series

2/07 at 102.00

AAA

16,031,700

   1997, 5.750%, 2/15/27 - MBIA Insured

 

18,000

Wisconsin Health and Educational Facilities Authority, Revenue Bonds, Aurora Healthcare Inc.,

8/07 at 102.00

AAA

19,325,700

   Series 1997, 5.250%, 8/15/17 - MBIA Insured


$

1,987,733

Total Long-Term Investments (cost $1,794,376,377) - 149.5%

1,956,448,646



Other Assets Less Liabilities - 2.5%

32,239,848


Preferred Shares, at Liquidation Value - (52.0)%

(680,000,000)


Net Assets Applicable to Common Shares - 100%

$1,308,688,494


  

All of the bonds in the portfolio are either covered by Original Issue Insurance, Secondary Market Insurance or

Portfolio Insurance, or are backed by an escrow or trust containing sufficient U.S. Government or U.S.

Government agency securities, any of which ensure the timely payment of principal and interest.

(1)  

All percentages shown in the Portfolio of Investments are based on net assets applicable to Common

shares unless otherwise noted.

*  

Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption. There

may be other call provisions at varying prices at later dates.

**  

Ratings: Using the higher of Standard & Poor's or Moody's rating.

(WI)  

Security purchased on a when-issued basis.

Income Tax Information

The following information is presented on an income tax basis. Differences between amounts for financial

statement and federal income tax purposes are primarily due to timing differences in recognizing income

on taxable market discount securities and timing differences in recognizing certain gains and losses on

security transactions.

At January 31, 2005, the cost of investments was $1,793,618,282.

Gross unrealized appreciation and gross unrealized depreciation of investments at January 31, 2005,

were as follows:


Gross unrealized:

   Appreciation

$163,609,583

   Depreciation

(779,219)


Net unrealized appreciation of investments

$162,830,364


Item 2. Controls and Procedures.

  1. 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") (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).
  2. There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) 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.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: EX-99 CERT Attached hereto.


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)         Nuveen Insured Municipal Opportunity Fund, Inc.        

By (Signature and Title)*          /s/ Jessica R. Droeger--Vice President and Secretary        

Date         04/01/05        

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 (Signature and Title)*         /s/ Gifford R. Zimmerman--Chief Administrative Officer (principal executive officer)        

Date         04/01/05        

By (Signature and Title)*         /s/ Stephen D. Foy--Vice President and Controller (principal financial officer)        

Date         04/01/05        

* Print the name and title of each signing officer under his or her signature.