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 811-6540 Name of Fund: MuniYield 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, MuniYield 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: 10/31/05 Date of reporting period: 05/01/05 - 07/31/05 Item 1 - Schedule of Investments MuniYield Insured Fund, Inc. Schedule of Investments as of July 31, 2005 (in Thousands) Face State Amount Municipal Bonds Value Alaska - 1.5% $ 3,695 Alaska Energy Authority, Power Revenue Refunding Bonds (Bradley Lake), Fourth Series, 6% due 7/01/2018 (g) $ 4,369 11,280 Alaska State Housing Finance Corporation, Revenue Refunding Bonds, Series A, 5.875% due 12/01/2024 (d)(i)(j) 11,597 Arizona - 0.9% 9,000 Maricopa County, Arizona, Hospital Revenue Refunding Bonds (Sun Health Corporation), 5% due 4/01/2035 9,061 California - 38.1% 10,000 Alameda Corridor Transportation Authority, California, Capital Appreciation Revenue Refunding Bonds, Subordinate Lien, Series A, 5.735%* due 10/01/2012 (a) 7,455 13,025 Alhambra, California, Unified School District, GO (Election of 2004), Series A, 5% due 8/01/2029 (c) 13,836 5,000 Antioch, California, Public Finance Authority, Lease Revenue Refunding Bonds (Municipal Facilities Project), Series A, 5.50% due 1/01/2032 (i) 5,428 10,000 California Health Facilities Financing Authority, Revenue Refunding Bonds (Cedars-Sinai Medical Center), 5% due 11/15/2034 10,258 10,000 California Infrastructure and Economic Development Bank, Bay Area Toll Bridges Revenue Bonds, First Lien, Series A, 5% due 7/01/2025 (c) 10,572 California State Department of Water Resources, Power Supply Revenue Bonds, Series A: 5,750 5.125% due 5/01/2018 (i) 6,235 10,000 5.25% due 5/01/2020 (i) 10,909 3,675 5.375% due 5/01/2021 3,977 12,010 5.375% due 5/01/2022 (i) 13,270 California State, GO, DRIVERS (i)(k): 7,450 Series 556, 8.36% due 11/01/2011 8,898 6,450 Series 557, 8.36% due 4/01/2012 7,766 5,000 California State, GO, Refunding, RIB, Series 471x, 8.44% due 9/01/2024 (i)(k) 6,030 Portfolio Abbreviations To simplify the listings of MuniYield Insured Fund, Inc.'s portfolio holdings in the Schedule of Investments, we have abbreviated the names of many of the securities according to the list 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 IDA Industrial Development Authority IDR Industrial Development Revenue Bonds PCR Pollution Control Revenue Bonds RIB Residual Interest Bonds RITR Residual Interest Trust Receipts S/F Single-Family VRDN Variable Rate Demand Notes MuniYield Insured Fund, Inc. Schedule of Investments as of July 31, 2005 (concluded) (in Thousands) Face State Amount Municipal Bonds Value California California State Public Works Board, Lease Revenue Bonds: (concluded) $ 5,500 (Department of Corrections), Series C, 5.25% due 6/01/2028 $ 5,839 3,755 (Department of General Services), Series D, 5.25% due 6/01/2028 3,986 5,250 (Department of Mental Health - Coalinga State Hospital), Series A, 5.125% due 6/01/2029 5,495 12,000 California State, Various Purpose, GO, 5.25% due 11/01/2029 12,732 32,000 California State, Various Purpose, GO, Refunding, 5% due 6/01/2034 (n) 33,531 7,740 California Statewide Communities Development Authority, Health Facility Revenue Bonds (Memorial Health Services), Series A, 6% due 10/01/2023 8,602 4,205 California Statewide Communities Development Authority, Water Revenue Bonds (Pooled Financing Program), Series C, 5.25% due 10/01/2034 (g) 4,499 7,500 Desert Sands, California, Unified School District, GO (Election of 2001), 5% due 6/01/2029 (g) 7,922 5,800 Fairfield-Suisun, California, Unified School District, GO (Election of 2002), 5.50% due 8/01/2028 (i) 6,452 5,015 Gavilan, California, Joint Community College District, GO, DRIVERS, Series 587-Z, 8.36% due 8/01/2012 (a)(k) 6,127 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds: 6,000 DRIVERS, Series 726, 8.61% due 12/01/2010 (c)(k) 7,565 13,500 RIB, Series 920X, 8.44% due 6/01/2033 (c)(k) 16,793 4,000 Series B, 5.50% due 6/01/2013 (f) 4,485 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Refunding Bonds, Series A: 10,000 4.88%* due 6/01/2027 (a) 3,475 25,000 5% due 6/01/2035 (c) 26,227 12,155 Huntington Beach, California, Union High School District, GO (Election of 2004), 5% due 8/01/2029 (g) 12,850 1,000 Long Beach, California, Harbor Revenue Refunding Bonds, AMT, Series B, 5.20% due 5/15/2027 (i) 1,059 5,000 Los Angeles, California, Harbor Department Revenue Bonds, RITR, AMT, Series RI-7, 9.785% due 11/01/2026 (i)(k) 5,471 28,800 Los Angeles, California, Unified School District, GO, Series A, 5% due 1/01/2028 (i) 30,398 12,775 Los Angeles, California, Water and Power Revenue Bonds (Power System), Series B, 5% due 7/01/2035 (g) 13,378 4,650 Madera, California, Unified School District, Capital Appreciation, GO (Election 2002), 5.23%* due 8/01/2029 (c) 1,455 Napa Valley, California, Community College District, Capital Appreciation, GO (Election of 2002), Series B (i): 9,295 5.019%* due 8/01/2026 3,439 5,000 5.279%* due 8/01/2027 1,757 11,725 5.222%* due 8/01/2028 3,902 12,135 Peralta, California, Community College District, GO (Election of 2000), Series D, 5% due 8/01/2030 (g) 12,881 4,730 Port of Oakland, California, DRIVERS, AMT, Series 839Z, 7.821% due 11/01/2010 (c)(k) 5,387 145 Port of Oakland, California, Revenue Bonds, AMT, Series K, 5.75% due 11/01/2021 (c) 156 7,000 Port of Oakland, California, Trust Receipts, Revenue Bonds, AMT, Class R, Series K, 8.793% due 11/01/2021 (c)(k) 8,063 10,000 Riverside County, California, Public Financing Authority, Tax Allocation Revenue Bonds (Redevelopment Projects), 5% due 10/01/2035 (e) 10,387 25,000 San Diego County, California, Water Authority, Water Revenue Bonds, COP, Series A, 5% due 5/01/2031 (g) 26,422 8,310 Stockton, California, Public Financing Authority, Lease Revenue Bonds (Parking & Capital Projects), 5.25% due 9/01/2034 (c) 8,944 District of 15,000 Metropolitan Washington, D.C. Airports Authority, Airport System Revenue Refunding Columbia - 1.5% Bonds, AMT, Series A, 5% due 10/01/2035 (i) 15,510 Florida - 4.6% 400 Escambia County, Florida, Health Facilities Authority, Health Facility Revenue Bonds (Florida Health Care Facility Loan), 5.95% due 7/01/2020 (a) 403 5,375 Miami-Dade County, Florida, Aviation Revenue Bonds, RIB, AMT, Series 1054-X, 8.11% due 10/01/2025 (c)(k) 6,046 1,000 Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT, 5.375% due 10/01/2027 (c) 1,061 17,085 Miami-Dade County, Florida, GO (Building Better Communities Program), 5% due 7/01/2029 (c) 18,127 10,000 Miami-Dade County, Florida, Subordinate Special Obligation Revenue Bonds, Series A, 5.23%* due 10/01/2036 (i) 2,010 Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds: 5,000 (Adventist Health System), 5.625% due 11/15/2032 5,334 2,000 (Orlando Regional Healthcare), 5.75% due 12/01/2032 2,138 9,600 Sarasota County, Florida, Public Hospital Board, Hospital Revenue Bonds (Sarasota Memorial Hospital), VRDN, Series A, 2.25% due 7/01/2037 (a)(h) 9,600 4,315 Tallahassee, Florida, Consolidated Utility Systems, Revenue Refunding Bonds, 5% due 10/01/2029 (a) 4,583 Georgia - 4.7% Atlanta, Georgia, Airport General Revenue Refunding Bonds (g): 26,500 AMT, Series A, 5.125% due 1/01/2030 27,763 12,500 Series B, 5.25% due 1/01/2033 13,420 Burke County, Georgia, Development Authority, PCR, Refunding: 7,150 (Georgia Power Company Vogtle Project), Second Series, 4.625% due 5/01/2034 (c) 7,163 1,200 (Oglethorpe Power Corporation-Vogtle), VRDN, 2.25% due 1/01/2022 (a)(h) 1,200 Hawaii - 0.2% 2,000 Hawaii State, GO, Series CX, 5.50% due 2/01/2021 (g) 2,199 Illinois - 8.0% 2,000 Chicago, Illinois, Board of Education, GO, VRDN, Series C-1, 2.23% due 3/01/2031 (g)(h) 2,000 Chicago, Illinois, O'Hare International Airport Revenue Bonds, AMT: 13,115 DRIVERS, Series 368, 9.319% due 7/01/2011 (i)(k) 16,534 8,600 DRIVERS, Series 369, 9.319% due 7/01/2011 (e)(k) 10,764 16,685 Third Lien, Series B-2, 5.25% due 1/01/2027 (i) 17,602 Chicago, Illinois, O'Hare International Airport, Revenue Refunding Bonds, AMT: 8,200 DRIVERS, Series 653-Z, 8.32% due 1/01/2012 (g)(k) 9,065 1,500 Third Lien, Series C-2, 5.25% due 1/01/2034 (e) 1,576 10,000 Illinois State, GO, First Series, 5.50% due 4/01/2016 (g) 11,049 2,000 Illinois State Sales Tax Revenue Bonds, 6.125% due 6/15/2016 2,244 6,035 McLean and Woodford Counties, Illinois, Community Unit, School District Number 005, GO, Refunding, 6.375% due 12/01/2016 (g) 7,017 4,800 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project), Series B, 5.75% due 6/15/2023 (i) 5,417 1,000 Regional Transportation Authority, Illinois, Revenue Bonds, Series C, 7.75% due 6/01/2020 (c) 1,394 Indiana - 4.8% 2,250 Indiana Health Facilities Financing Authority, Hospital Revenue Bonds (Deaconess Hospital Obligated Group), Series A, 5.375% due 3/01/2034 (a) 2,420 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A (c): 3,000 5.25% due 6/01/2026 3,230 14,000 5.25% due 6/01/2028 15,075 20,000 5.25% due 6/01/2029 21,521 8,000 Indianapolis, Indiana, Local Public Improvement Bond Bank Revenue Bonds (Waterworks Project), Series A, 5.125% due 7/01/2027 (i) 8,412 Kansas - 0.9% 8,500 Burlington, Kansas, PCR, Refunding (Kansas Gas and Electric Company Project), Series A, 5.30% due 6/01/2031 (i) 9,200 Louisiana - 1.9% 3,750 Louisiana Local Government, Environmental Facilities, Community Development Authority Revenue Bonds (Capital Projects and Equipment Acquisition), Series A, 6.30% due 7/01/2030 (a) 4,081 15,000 Louisiana Public Facilities Authority, Mortgage Revenue Refunding Bonds (Baton Rouge General Medical Center Project), 5.25% due 7/01/2033 (d)(i) 15,853 Maine - 0.7% 6,955 Maine Health and Higher Educational Facilities Authority, Revenue Bonds, Series A, 5% due 7/01/2035 (i) 7,322 Massachusetts - 9.1% 2,500 Massachusetts State, HFA, Housing Development Revenue Refunding Bonds, Series B, 5.40% due 12/01/2028 (i) 2,587 15,000 Massachusetts State, HFA, Rental Housing Mortgage Revenue Bonds, AMT, Series A, 5.15% due 7/01/2026 (g) 15,216 7,550 Massachusetts State Port Authority Revenue Bonds, Series A, 5% due 7/01/2033 (i) 7,896 29,330 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5% due 8/15/2030 (g) 31,113 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds (c)(f): 10,000 5% due 1/01/2014 10,873 14,620 5.25% due 1/01/2014 16,158 10,000 5.75% due 1/01/2014 11,394 1,500 Massachusetts State Water Resource Authority, General Revenue Refunding Bonds, Series A, 5% due 8/01/2028 (i) 1,603 Michigan - 5.5% 9,360 Clarkston, Michigan, Community Schools, GO, 5.25% due 5/01/2029 (g) 10,011 12,500 Detroit, Michigan, Sewer Disposal Revenue Bonds, Senior Lien, VRDN, Series A, 2.22% due 7/01/2033 (g)(h) 12,500 1,000 Eastern Michigan University Revenue Refunding Bonds, VRDN, 2.23% due 6/01/2027 (c)(h) 1,000 6,500 Michigan State Hospital Finance Authority, Revenue Refunding Bonds, 5% due 11/15/2036 (i) 6,797 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds, DRIVERS, AMT (e)(k): 2,500 Series 857Z, 8.378% due 3/01/2010 2,852 4,000 Series 858Z, 8.079% due 12/01/2011 4,614 20,000 Wayne County, Michigan, Airport Authority Revenue Bonds (Detroit Metropolitan Wayne County Airport), AMT, 5% due 12/01/2029 (i) 20,818 Minnesota - 2.9% 10,000 Minneapolis and Saint Paul, Minnesota, Metropolitan Airports Commission, Airport Revenue Bonds, Series A, 5.90% due 1/01/2010 (c)(f) 11,183 Minneapolis and Saint Paul, Minnesota, Metropolitan Airports Commission, Airport Revenue Refunding Bonds, Sub-Series A (a): 4,875 5% due 1/01/2029 5,137 13,700 5% due 1/01/2035 14,414 Missouri - 0.3% 195 Missouri State Housing Development Commission, S/F Mortgage Revenue Bonds (Homeowner Loan), AMT, Series C-1, 7.15% due 3/01/2032 (l) 204 2,800 Saint Louis, Missouri, Airport Revenue Bonds (Airport Development Program), Series A, 5.625% due 7/01/2011 (f)(i) 3,128 Nevada - 10.6% 25,000 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2, 5% due 7/01/2030 (c) 26,096 Clark County, Nevada, IDR (Southwest Gas Corporation Project), AMT: 12,675 Series A, 5.25% due 7/01/2034 (a) 13,344 12,000 Series D, 5.25% due 3/01/2038 (c) 12,535 6,000 Henderson, Nevada, Health Care Facilities Revenue Bonds (Catholic Healthcare West), Series A, 5.625% due 7/01/2024 6,428 5,000 Humboldt County, Nevada, PCR, Refunding (Sierra Pacific Project), 6.55% due 10/01/2013 (a) 5,235 20,375 Nevada State, Nevada Municipal Bond Bank, GO, Series A, 5.50% due 11/01/2025 (c) 20,725 3,130 Reno, Nevada, Capital Improvement Revenue Bonds, 5.50% due 6/01/2019 (c) 3,458 Washoe County, Nevada, Gas Facilities Revenue Bonds (Sierra Pacific Power Company), AMT: 15,000 6.65% due 12/01/2017 (a) 15,121 5,000 6.55% due 9/01/2020 (i) 5,092 5,000 Washoe County, Nevada, Water Facility Revenue Bonds (Sierra Pacific Power Company), AMT, 6.65% due 6/01/2017 (i) 5,167 New Jersey - 6.1% 16,000 Garden State Preservation Trust of New Jersey, Open Space and Farmland Preservation Revenue Bonds, Series A, 5.75% due 11/01/2028 (g) 19,352 New Jersey EDA, Cigarette Tax Revenue Bonds: 3,060 5.75% due 6/15/2029 3,279 2,610 5.50% due 6/15/2031 2,737 14,135 5.75% due 6/15/2034 15,064 14,830 New Jersey EDA, Revenue Bonds, DRIVERS, Series 785-Z, 7.861% due 7/01/2012 (i)(k) 17,270 3,250 New Jersey EDA, School Facility Construction Revenue Bonds, Series I, 5.25% due 9/01/2014 (f) 3,628 Newark, New Jersey, Housing Authority, Port Authority-Port Newark Marine Terminal Additional Rent-Backed Revenue Bonds (City of Newark Redevelopment Projects) (i): 1,500 5.50% due 1/01/2027 1,658 1,380 5.50% due 1/01/2028 1,522 New Mexico - 0.2% 1,605 New Mexico Educational Assistance Foundation, Student Loan Revenue Refunding Bonds (Student Loan Program), AMT, First Sub-Series A-2, 6.65% due 11/01/2025 1,636 755 New Mexico Mortgage Finance Authority, S/F Mortgage Revenue Bonds, AMT, Series C-2, 6.95% due 9/01/2031 (l) 769 New York - 17.6% 10,250 Long Island Power Authority, New York, Electric System Revenue Bonds, Series A, 5.10% due 9/01/2029 10,757 12,500 Metropolitan Transportation Authority, New York, Commuter Facilities Revenue Refunding Bonds, Series B, 5.125% due 7/01/2024 (a)(b) 13,075 65,000 New York City, New York, City Municipal Water Finance Authority, Water and Sewer System, Revenue Refunding Bonds, Series B, 5% due 6/15/2036 (g) 68,401 New York City, New York, GO: 8,500 Series A, 5% due 8/01/2030 8,888 4,735 Series B, 5.875% due 8/01/2010 (f)(i) 5,349 9,105 Series B, 5.875% due 8/01/2016 (i) 10,198 10,000 Series J, 5.25% due 5/15/2024 10,712 1,000 Series J, 5.25% due 5/15/2025 1,075 20,000 Series M, 5% due 4/01/2030 20,888 10,000 Series O, 5% due 6/01/2033 10,431 6,000 Sub-Series C-1, 5.25% due 8/15/2026 6,371 19,500 Port Authority of New York and New Jersey, Consolidated Revenue Bonds, AMT, 137th Series, 5.125% due 7/15/2030 (g) 20,698 Oklahoma - 0.8% 7,500 Oklahoma State, IDR, Refunding, DRIVERS, Series 455, 8.85% due 2/15/2008 (i)(k) 8,851 Oregon - 1.6% 15,000 Portland, Oregon, Sewer System Revenue Bonds, Series A, 5.75% due 8/01/2010 (c)(f) 16,678 Pennsylvania - 3.8% 7,800 Pennsylvania State Turnpike Commission, Turnpike Revenue Bonds, DRIVERS, Series 460-Z, 8.35% due 6/01/2012 (a)(k) 9,595 Philadelphia, Pennsylvania, School District, GO (c): 5,175 Series B, 5.625% due 8/01/2012 (f) 5,838 12,115 Series D, 5.125% due 6/01/2034 12,801 6,000 Series D, 5.25% due 6/01/2034 6,447 5,000 Sayre, Pennsylvania, Health Care Facilities Authority Revenue Bonds (Guthrie Healthcare System), Series B, 7.125% due 12/01/2031 5,939 South Carolina - 2.3% 1,325 South Carolina Housing Finance and Development Authority, Mortgage Revenue Refunding Bonds, AMT, Series A-2, 6.35% due 7/01/2019 (g) 1,419 18,030 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2029 (a) 18,835 4,200 Spartanburg County, South Carolina, Solid Waste Disposal Facilities Revenue Bonds (BMW Project), AMT, 7.55% due 11/01/2024 4,367 Tennessee - 1.2% Sevier County, Tennessee, Public Building Authority, Local Government Public Improvement Revenue Bonds, VRDN (h): 1,400 Series IV-1, 2.25% due 6/01/2023 (g) 1,400 690 Series IV-E-1, 2.25% due 6/01/2030 (a) 690 Tennessee HDA, Revenue Bonds (Homeownership Program), AMT, Series 2C: 1,795 6.05% due 7/01/2012 1,826 2,250 6.15% due 7/01/2014 2,269 Tennessee HDA, Revenue Refunding Bonds (Homeownership Program), AMT, Series A (g): 3,745 5.25% due 7/01/2022 3,887 2,655 5.35% due 1/01/2026 2,755 Texas - 10.8% 9,800 Bell County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Scott & White Memorial Hospital), VRDN, Series 2001-2, 2.26% due 8/15/2031 (h)(i) 9,800 1,880 Bexar, Texas, Metropolitan Water District, Waterworks System Revenue Refunding Bonds, 6.35% due 5/01/2025 (i) 1,923 10,500 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, DRIVERS, AMT, Series 353, 8.32% due 5/01/2011 (i)(k) 12,023 7,500 Dallas-Fort Worth, Texas, International Airport Revenue Refunding Bonds, DRIVERS, AMT, Series 336Z, 8.58% due 11/01/2026 (c)(k) 8,594 Harris County, Houston, Texas, Sports Authority, Revenue Refunding Bonds, Senior Lien, Series G (i): 1,665 5.75% due 11/15/2019 1,839 3,500 5.75% due 11/15/2020 3,864 10,000 5.25% due 11/15/2030 10,530 4,600 Harris County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Texas Children's Hospital), VRDN, Series B-1, 2.23% due 10/01/2029 (h)(i) 4,600 15,000 Houston, Texas, Airport System Revenue Refunding Bonds, RIB, Series 845X, 8.41% due 7/01/2030 (g)(k) 17,325 4,835 Texas State Department of Housing and Community Affairs, S/F Mortgage Revenue Bonds, AMT, Series A, 5.45% due 9/01/2023 (i)(l) 5,050 10,000 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.50% due 8/15/2039 (a) 11,016 4,000 Texas Technical University, Financing System Revenue Bonds, Seventh Series, 5.50% due 8/15/2019 (i) 4,403 10,000 Travis County, Texas, Health Facilities Development Corporation, Revenue Refunding Bonds, RITR, Series 4, 8.983% due 11/15/2024 (a)(k) 12,253 11,240 University of Houston, Texas, University Revenue Bonds, 5.50% due 2/15/2030 (i) 12,074 Vermont - 0.1% 900 Vermont HFA, S/F Housing Revenue Bonds, AMT, Series 12B, 6.30% due 11/01/2019 (g) 905 Virginia - 0.3% 2,500 Halifax County, Virginia, IDA, Exempt Facility Revenue Refunding Bonds (Old Dominion Electric Cooperative Project), AMT, 5.625% due 6/01/2028 (a) 2,751 Washington - 16.8% Bellevue, Washington, GO, Refunding (i): 2,545 5.25% due 12/01/2026 2,745 2,455 5.25% due 12/01/2027 2,650 2,850 5.25% due 12/01/2028 3,074 3,000 5.25% due 12/01/2029 3,234 17,600 5% due 12/01/2034 18,442 16,150 Central Puget Sound Regional Transportation Authority, Washington, Sales and Use Tax Revenue Bonds, Series A, 5% due 11/01/2030 (a) 16,989 3,030 Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Bonds (Chelan Hydro System), AMT, Series A, 5.45% due 7/01/2037 (a) 3,208 Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Refunding Bonds (Chelan Hydro System), AMT (i): 6,595 Series B, 6.35% due 7/01/2026 7,101 6,000 Series C, 5.65% due 7/01/2032 6,526 10,000 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Project Number 1), Series B, 6% due 7/01/2017 (i) 11,459 5,000 King County, Washington, Sewer, GO, 5% due 1/01/2030 (c) 5,261 3,500 Port Seattle, Washington, Revenue Bonds, Series A, 5.50% due 2/01/2026 (i) 3,779 19,565 Port Seattle, Washington, Revenue Refunding Bonds, Series B, AMT, 5.20% due 7/01/2029 (i) 20,558 10,000 Radford Court Properties, Washington, Student Housing Revenue Bonds, 5.75% due 6/01/2032 (i) 11,040 1,720 Seattle, Washington, Drain and Wastewater Utility Revenue Bonds, 5.75% due 11/01/2029 (i) 1,884 2,000 Seattle, Washington, Water System Revenue Bonds, Series B, 6% due 7/01/2029 (c) 2,197 Skagit County, Washington, Public Hospital District, GO, Series A (i): 4,945 5.25% due 12/01/2025 5,358 5,450 5.25% due 12/01/2026 5,879 7,250 Tacoma, Washington, Solid Waste Utility Revenue Refunding Bonds, Series B, 5.50% due 12/01/2019 (a) 7,688 2,000 University of Washington, University Revenue Bonds (Student Facilities Fee), 5.75% due 6/01/2010 (f)(g) 2,231 Washington State, GO: 10,000 DRIVERS, Series 438Z, 8.60% due 1/01/2009 (i)(k) 11,736 15,930 Series B, 6% due 1/01/2010 (f)(g) 17,727 7,000 Washington State Health Care Facilities Authority Revenue Bonds (Providence Health System), Series A, 5.25% due 10/01/2021 (i) 7,449 West Virginia - 0.6% 5,925 Harrison County, West Virginia, County Commission for Solid Waste Disposal Revenue Bonds (Monongahela Power), AMT, Series C, 6.75% due 8/01/2024 (a) 6,003 Wisconsin - 0.3% 3,395 Wisconsin State Health and Educational Facilities Authority Revenue Bonds (Synergyhealth Inc.), 6% due 11/15/2032 3,654 Total Municipal Bonds (Cost - $1,594,378) - 158.7% 1,684,549 Shares Held Short-Term Securities 13,700 Merrill Lynch Institutional Tax-Exempt Fund (m) 13,700 Total Short-Term Securities (Cost - $13,700) - 1.3% 13,700 Total Investments (Cost - $1,608,079**) - 160.0% 1,698,249 Liabilities in Excess of Other Assets - (6.3%) (67,066) Preferred Stock, at Redemption Value - (53.7%) (570,079) ----------- Net Assets Applicable to Common Stock - 100.0% $ 1,061,104 =========== * Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase by the Fund. ** The cost and unrealized appreciation (depreciation) of investments as of July 31, 2005, as computed for federal income tax purposes, were as follows: (in Thousands) Aggregate cost $ 1,608,079 =============== Gross unrealized appreciation $ 90,960 Gross unrealized depreciation (790) --------------- Net unrealized appreciation $ 90,170 =============== (a) AMBAC Insured. (b) Escrowed to maturity. (c) FGIC Insured. (d) FHA Insured. (e) XL Capital Insured. (f) Prerefunded. (g) FSA Insured. (h) 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. (i) MBIA Insured. (j) FNMA Collateralized. (k) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (l) FNMA/GNMA Collateralized. (m) 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: (in Thousands) Net Dividend Affiliate Activity Income Merrill Lynch Institutional Tax-Exempt Fund 13,569 $ 62 (n) CIFG Insured. Forward interest rate swaps outstanding as of July 31, 2005 were as follows: (in Thousands) Unrealized Notional Appreciation Amount (Depreciation) Receive a variable rate equal to a 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate equal to 3.647% Broker, JPMorgan Chase Bank Expires October 2015 $ 226,000 $ 360 Receive a variable rate equal to a 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate equal to 4.042% Broker, JPMorgan Chase Bank Expires August 2026 $ 15,555 (172) --------- Total $ 188 ========= 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. MuniYield Insured Fund, Inc. By: /s/ Robert C. Doll, Jr. ----------------------- Robert C. Doll, Jr., Chief Executive Officer MuniYield Insured Fund, Inc. Date: September 23, 2005 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 MuniYield Insured Fund, Inc. Date: September 23, 2005 By: /s/ Donald C. Burke ----------------------- Donald C. Burke, Chief Financial Officer MuniYield Insured Fund, Inc. Date: September 23, 2005