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 811-8707 Name of Fund: MuniHoldings Insured Fund, Inc. Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Robert C. Doll, Jr., Chief Executive Officer, MuniHoldings Insured Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011 Registrant's telephone number, including area code: (609) 282-2800 Date of fiscal year end: 04/30/2007 Date of reporting period: 05/01/06 - 07/31/06 Item 1 - Schedule of Investments MuniHoldings Insured Fund, Inc. Schedule of Investments as of July 31, 2006 (In Thousands) Face State Amount Municipal Bonds Value Alabama - 1.3% $ 2,170 Jefferson County, Alabama, Limited Obligation School Warrants, Series A, 5.50% due 1/01/2022 $ 2,317 Arkansas - 2.2% 3,710 Arkansas State Development Finance Authority, M/F Mortgage Revenue Refunding Bonds, DRIVERS, Series 964Z, 6.73% due 6/01/2010 (c)(e)(j) 3,960 California - 33.6% 3,250 California Pollution Control Financing Authority, PCR, Refunding, DRIVERS, AMT, Series 878Z, 6.719% due 12/01/2009 (e)(j) 3,630 190 California State, GO, 5.50% due 4/01/2014 (f) 211 1,110 California State, GO, 5.50% due 4/01/2028 1,200 2,000 California State Public Works Board, Lease Revenue Bonds (Department of General Services - Capitol East End Complex), Series A, 5% due 12/01/2027 (a) 2,052 1,800 East Side Union High School District, California, Santa Clara County, GO (Election of 2002), Series B, 5% due 8/01/2027 (b) 1,856 1,335 East Side Union High School District, California, Santa Clara County, GO (Election of 2002), Series D, 5% due 8/01/2021 (g) 1,401 5,155 East Side Union High School District, California, Santa Clara County, GO (Election of 2002), Series D, 5% due 8/01/2029 (g) 5,317 2,000 Los Angeles, California, Unified School District, GO (Election of 1997), Series F, 5% due 1/01/2028 (b) 2,064 4,395 Los Angeles, California, Unified School District, GO, Series A, 5% due 1/01/2028 (e) 4,536 2,565 Modesto, California, Schools Infrastructure Financing Agency, Special Tax Bonds, 5.50% due 9/01/2036 (a) 2,753 5,005 San Francisco, California, City and County, GO (California Academy of Sciences Improvements), Series E, 5% due 6/15/2023 (e) 5,210 1,265 San Jose, California, GO (Libraries, Parks and Public Safety Projects), 5% due 9/01/2030 (e) 1,304 2,635 San Pablo, California, Joint Powers Financing Authority, Tax Allocation Revenue Refunding Bonds, 5.66% due 12/01/2024 (e)(m) 1,039 Portfolio Abbreviations To simplify the listings of MuniHoldings Insured Fund, Inc.'s portfolio holdings in the Schedule of Investments, we have abbreviated the names of many of the securities according to the listed below. AMT Alternative Minimum Tax (subject to) COP Certificates of Participation DRIVERS Derivative Inverse Tax-Exempt Receipts EDA Economic Development Authority GO General Obligation Bonds HDA Housing Development Authority HFA Housing Finance Agency M/F Multi-Family PCR Pollution Control Revenue Bonds VRDN Variable Rate Demand Notes MuniHoldings Insured Fund, Inc. Schedule of Investments as of July 31, 2006 (concluded) (In Thousands) Face State Amount Municipal Bonds Value California $ 2,355 San Pablo, California, Joint Powers Financing Authority, Tax Allocation (concluded) Revenue Refunding Bonds, 5.66% due 12/01/2025 (e)(m) $ 875 2,355 San Pablo, California, Joint Powers Financing Authority, Tax Allocation Revenue Refunding Bonds, 5.66% due 12/01/2026 (e)(m) 825 4,265 Santa Ana, California, Unified School District, GO, 5% due 8/01/2032 (e) 4,370 3,145 Sequoia, California, Unified High School District, GO, Refunding, Series B, 5.50% due 7/01/2035 (d) 3,436 4,540 Stockton, California, Public Financing Revenue Bonds (Redevelopment Projects), Series A, 5.25% due 9/01/2031 (h) 4,735 2,080 Sweetwater, California, Union High School District, Public Financing Authority, Special Tax Revenue Bonds, Series A, 5% due 9/01/2028 (d) 2,143 2,180 Tustin, California, Unified School District, Senior Lien Special Tax Bonds (Community Facilities District Number 97-1), Series A, 5% due 9/01/2032 (d) 2,223 2,800 Tustin, California, Unified School District, Senior Lien Special Tax Bonds (Community Facilities District Number 97-1), Series A, 5% due 9/01/2038 (d) 2,857 2,000 University of California Revenue Bonds (Multiple Purpose Projects), Series Q, 5% due 9/01/2022 (d) 2,077 3,480 West Contra Costa, California, Unified School District, GO, Series C, 5% due 8/01/2021 (b) 3,622 Colorado - 6.4% 2,440 Aurora, Colorado, COP, 5.75% due 12/01/2010 (a)(f) 2,626 2,560 Aurora, Colorado, COP, 5.75% due 12/01/2010 (a)(f) 2,755 2,730 Aurora, Colorado, COP, 5.75% due 12/01/2010 (a)(f) 2,938 2,890 Aurora, Colorado, COP, 5.75% due 12/01/2010 (a)(f) 3,111 Florida - 2.4% 2,225 Miami-Dade County, Florida, Subordinate Special Obligation Revenue Bonds, Series A, 5.24% due 10/01/2037 (e)(m) 433 3,850 Pasco County, Florida, Half-Cent Sales Tax Revenue Bonds, 5.125% due 12/01/2028 (a) 3,994 Georgia - 3.5% 4,000 Augusta, Georgia, Water and Sewer Revenue Bonds, 5.25% due 10/01/2034 (d) 4,211 1,900 Burke County, Georgia, Development Authority, PCR, Refunding (Oglethorpe Power Corporation), VRDN, Series B, 3.60% due 1/01/2020 (a)(i) 1,900 Illinois - 10.8% 2,790 Chicago, Illinois, GO, Series A, 6% due 7/01/2010 (b)(f) 3,035 2,000 Chicago, Illinois, GO, Series A, 6% due 7/01/2010 (b)(f) 2,176 3,175 Chicago, Illinois, GO, Series A, 6% due 7/01/2010 (b)(f) 3,454 2,150 Chicago, Illinois, O'Hare International Airport Revenue Bonds, DRIVERS, AMT, Series 845-Z, 7.998% due 1/01/2012 (e)(g)(j) 2,590 2,965 Chicago, Illinois, Park District, Limited Tax, GO, Series A, 5.75% due 1/01/2011 (b)(f) 3,198 4,500 Illinois State, GO, First Series, 6% due 1/01/2018 (b) 4,788 45 Lake, Cook, Kane and McHenry Counties, Illinois, Community Unit School District Number 220, GO, 5.75% due 12/01/2019 (b) 48 Indiana - 1.2% 2,000 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A, 5.25% due 6/01/2029 (b) 2,103 Louisiana - 0.5% 945 Louisiana State, Gas and Fuels Tax Revenue Bonds, Series A, 5% due 5/01/2030 (b) 972 Massachusetts - 10.4% 3,565 Massachusetts Bay Transportation Authority, Sales Tax Revenue Refunding Bonds, Senior Series A, 5% due 7/01/2035 3,636 2,105 Massachusetts Bay Transportation Authority, Special Assessment Revenue Refunding Bonds, Series A, 5% due 7/01/2031 2,175 565 Massachusetts State, HFA, Housing Development Revenue Refunding Bonds, AMT, Series A, 5.15% due 6/01/2011 (e) 566 2,440 Massachusetts State, HFA, Rental Housing Mortgage Revenue Bonds, AMT, Series C, 5.50% due 7/01/2032 (d) 2,557 9,405 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5% due 8/15/2030 (d) 9,744 Michigan - 3.8% 2,035 Boyne City, Michigan, Public School District, GO, 5.75% due 5/01/2009 (b)(f) 2,139 1,750 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds, DRIVERS, AMT, Series 857Z, 7.299% due 3/01/2010 (g)(j) 1,931 1,000 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds, DRIVERS, AMT, Series 858Z, 7% due 12/01/2011 (g)(j) 1,115 1,500 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Pollution), AMT, Series B, 5.65% due 9/01/2029 (g) 1,577 Minnesota - 2.4% 4,015 Sauk Rapids, Minnesota, Independent School District Number 47, GO, Series A, 5.65% due 2/01/2019 (e) 4,320 Missouri - 5.3% 2,000 Cape Girardeau, Missouri, School District Number 063, GO (Missouri Direct Deposit Program), 5.50% due 3/01/2018 (b) 2,103 1,925 Mehlville, Missouri, School District Number R-9, COP, Series A, 5.50% due 3/01/2014 (d) 2,054 2,175 Mehlville, Missouri, School District Number R-9, COP, Series A, 5.50% due 3/01/2015 (d) 2,317 1,170 Mehlville, Missouri, School District Number R-9, COP, Series A, 5.50% due 3/01/2016 (d) 1,247 1,500 Mehlville, Missouri, School District Number R-9, COP, Series A, 5.50% due 3/01/2017 (d) 1,591 Nebraska - 2.2% 1,585 Omaha Convention Hotel Corporation, Nebraska, Convention Center Revenue Bonds, First Tier, Series A, 5.50% due 4/01/2020 (a) 1,699 2,000 Omaha Convention Hotel Corporation, Nebraska, Convention Center Revenue Bonds, First Tier, Series A, 5.50% due 4/01/2021 (a) 2,136 New Jersey - 17.7% 1,800 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.625% due 6/15/2018 1,866 5,295 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.75% due 6/15/2029 5,607 3,800 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.75% due 6/15/2034 (l) 4,117 6,700 New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A, 5.25% due 7/01/2033 (e) 7,063 3,020 New Jersey State Transportation Trust Fund Authority, Transportation System Revenue Bonds, Series D, 5% due 6/15/2015 (d)(f) 3,244 3,685 New Jersey State Transportation Trust Fund Authority, Transportation System Revenue Bonds, Series D, 5% due 6/15/2019 (d) 3,865 5,500 New Jersey State Turnpike Authority, Turnpike Revenue Bonds, Series C, 5% due 1/01/2030 (d) 5,683 New Mexico - 2.0% 3,325 New Mexico Finance Authority, Senior Lien State Transportation Revenue Bonds, Series A, 5.125% due 6/15/2018 (e) 3,541 New York - 26.9% 10,000 Nassau Health Care Corporation, New York, Health System Revenue Bonds, 5.75% due 8/01/2009 (d)(f) 10,753 230 New York City, New York, GO, Refunding, Series G, 5.75% due 2/01/2017 (d) 234 4,000 New York City, New York, GO, Series E, 5% due 11/01/2017 (d) 4,229 7,085 New York City, New York, GO, Series G, 5.75% due 10/15/2007 (d)(f) 7,329 4,055 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, Series A, 5% due 10/15/2020 (e) 4,266 4,095 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, Series A, 5.25% due 10/15/2027 (a) 4,361 4,000 New York City, New York, Sales Tax Asset Receivable Corporation Revenue Bonds, Series A, 5% due 10/15/2032 (a) 4,133 3,505 New York State Dormitory Authority Revenue Bonds (School Districts Financing Program), Series D, 5.25% due 10/01/2023 (e) 3,728 4,900 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series C-1, 5.50% due 6/01/2017 5,204 3,430 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series C-1, 5.50% due 6/01/2020 (b) 3,690 Oregon - 0.9% 1,400 Portland, Oregon, Urban Renewal and Redevelopment Tax Allocation Bonds (Oregon Convention Center), Series A, 5.75% due 6/15/2015 (a) 1,506 Pennsylvania - 12.8% 3,900 Pennsylvania State Higher Educational Facilities Authority, State System of Higher Education Revenue Bonds, Series O, 5.125% due 6/15/2024 (a) 3,933 6,045 Philadelphia, Pennsylvania, Airport Revenue Bonds (Philadelphia Airport System), AMT, Series B, 5.50% due 6/15/2017 (b) 6,225 3,390 Pittsburgh, Pennsylvania, GO, Refunding, Series B, 5.25% due 9/01/2017 (d) 3,676 2,615 Pittsburgh, Pennsylvania, GO, Series C, 5.25% due 9/01/2017 (d) 2,836 2,015 Seneca Valley, Pennsylvania, School District, GO, 5% due 1/01/2019 (b) 2,123 1,800 Washington County, Pennsylvania, Capital Funding Authority Revenue Bonds (Capital Projects and Equipment Program), 6.15% due 12/01/2029 (a) 1,923 1,885 York County, Pennsylvania, School of Technology Authority, Lease Revenue Refunding Bonds, 5.50% due 2/15/2022 (b) 2,026 Rhode Island - 4.8% 5,000 Providence, Rhode Island, Redevelopment Agency Revenue Refunding Bonds (Public Safety and Municipal Buildings), Series A, 5.75% due 4/01/2010 (a)(f) 5,374 2,870 Rhode Island State Health and Educational Building Corporation Revenue Bonds (Rhode Island School of Design), Series D, 5.50% due 8/15/2031 (g) 3,076 South Carolina - 0.9% 1,525 Medical University Hospital Authority, South Carolina, Hospital Facilities, Revenue Refunding Bonds, Series A, 5.25% due 2/15/2025 (c)(e) 1,605 Tennessee - 2.9% 2,580 Tennessee HDA, Revenue Refunding Bonds (Homeownership Program), AMT, Series A, 5.25% due 7/01/2022 (d) 2,638 2,370 Tennessee HDA, Revenue Refunding Bonds (Homeownership Program), AMT, Series A, 5.35% due 1/01/2026 (d) 2,425 Texas - 4.1% 4,000 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, DRIVERS, AMT, Series 778-Z, 6.999% due 11/01/2011 (e)(j) 4,438 2,780 Houston, Texas, Community College System, Participation Interests, COP (Alief Center Project), 5.75% due 8/15/2022 (e) 2,910 Washington - 4.9% 4,000 Bellevue, Washington, GO, Refunding, 5.50% due 12/01/2039 (e) 4,337 2,310 Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Bonds (Chelan Hydro System), AMT, Series A, 5.45% due 7/01/2037 (a) 2,425 1,810 Snohomish County, Washington, Public Utility District Number 001, Electric Revenue Bonds, 5.50% due 12/01/2022 (d) 1,943 West Virginia - 2.9% 5,000 West Virginia State Housing Development Fund, Housing Finance Revenue Refunding Bonds, Series D, 5.20% due 11/01/2021 (e) 5,141 Wisconsin - 0.3% 500 Wisconsin State Health and Educational Facilities Authority Revenue Bonds (Blood Center of Southeastern Wisconsin Project), 5.50% due 6/01/2024 521 Wyoming - 0.9% 1,500 Wyoming Student Loan Corporation, Student Loan Revenue Refunding Bonds, Series A, 6.20% due 6/01/2024 1,585 Puerto Rico - 3.0% 3,235 Puerto Rico Electric Power Authority, Power Revenue Bonds, Series RR, 5% due 7/01/2027 (g) 3,355 1,870 Puerto Rico Public Buildings Authority, Government Facilities Revenue Refunding Bonds, Series D, 5.25% due 7/01/2036 1,918 Total Municipal Bonds (Cost - $297,890) - 171.0% 304,104 Shares Held Short-Term Securities 21 Merrill Lynch Institutional Tax-Exempt Fund, 3.45% (k)(n) 21 Total Short-Term Securities (Cost - $21) - 0.0% 21 Total Investments (Cost - $297,911*) - 171.0% 304,125 Other Assets Less Liabilities - 4.4% 7,811 Preferred Stock, at Redemption Value - (75.4%) (134,070) ------------ Net Assets Applicable to Common Stock - 100.0% $ 177,866 ============ * The cost and unrealized appreciation (depreciation) of investments as of July 31, 2006, as computed for federal income tax purposes, were as follows: Aggregate cost $ 297,957 ================= Gross unrealized appreciation $ 7,308 Gross unrealized depreciation (1,140) ----------------- Net unrealized appreciation $ 6,168 ================= (a) AMBAC Insured. (b) FGIC Insured. (c) FHA Insured. (d) FSA Insured. (e) MBIA Insured. (f) Prerefunded. (g) XL Capital Insured. (h) Radian Insured. (i) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (j) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (k) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: Net Dividend Affiliate Activity Income Merrill Lynch Institutional Tax-Exempt Fund -- --* * Amount is less than $1,000. (l) Assured Guaranty Insured. (m) Represents a zero coupon bond, the interest rate shown reflects the effective yield at the time of purchase. (n) Represents the effective yield as of July 31, 2006. Item 2 - Controls and Procedures 2(a) - The registrant's certifying officers have reasonably designed such disclosure controls and procedures to ensure material information relating to the registrant is made known to us by others particularly during the period in which this report is being prepared. The registrant's certifying officers have determined that the registrant's disclosure controls and procedures are effective based on our evaluation of these controls and procedures as of a date within 90 days prior to the filing date of this report. 2(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d)) that occurred during the last fiscal quarter of the period covered by this report that has materially affected, or is 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. MuniHoldings Insured Fund, Inc. By: /s/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr. Chief Executive Officer MuniHoldings Insured Fund, Inc. Date: September 20, 2006 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/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr. Chief Executive Officer MuniHoldings Insured Fund, Inc. Date: September 20, 2006 By: /s/ Donald C. Burke ----------------------- Donald C. Burke Chief Financial Officer MuniHoldings Insured Fund, Inc. Date: September 20, 2006