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., President, 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: 11/01/04 - 01/31/05 Item 1 - Schedule of Investments MuniYield Insured Fund, Inc. Schedule of Investments as of January 31, 2005 (in Thousands) Face State Amount Municipal Bonds Value Alabama - 0.8% Jefferson County, Alabama, Limited Obligation School Warrants, Series A: $4,500 5.50% due 1/01/2021 $ 4,959 3,000 5% due 1/01/2024 3,136 Alaska - 1.6% Alaska Energy Authority, Power Revenue Refunding Bonds (Bradley Lake), Fourth Series (g): 3,695 6% due 7/01/2018 4,456 1,150 6% due 7/01/2020 1,402 11,280 Alaska State Housing Finance Corporation, Revenue Refunding Bonds, Series A, 5.875% due 12/01/2024 (d)(i)(j) 11,680 California - 33.6% 10,000 Alameda Corridor Transportation Authority, California, Capital Appreciation Revenue Refunding Bonds, Subordinate Lien, Series A, 5.473% due 10/01/2012 (a)(f) 7,321 5,000 Antioch, California, Public Finance Authority, Lease Revenue Refunding Bonds (Municipal Facilities Project), Series A, 5.50% due 1/01/2032 (i) 5,526 10,000 California Infrastructure and Economic Development Bank, Bay Area Toll Bridges Revenue Bonds, First Lien, Series A, 5% due 7/01/2025 (c) 10,649 California State Department of Water Resources, Power Supply Revenue Bonds: 10,000 Series A, 5.25% due 5/01/2020 (i) 11,054 3,675 Series A, 5.375% due 5/01/2021 4,020 12,010 Series A, 5.375% due 5/01/2022 (i) 13,225 1,500 VRDN, Series C-3, 1.82% due 5/01/2022 (a)(h) 1,500 California State, GO, DRIVERS (i)(k): 7,450 Series 556, 8.854% due 11/01/2011 8,912 6,450 Series 557, 8.854% due 4/01/2012 7,787 5,000 California State, GO, Refunding, RIB, Series 471x, 8.91% due 9/01/2024 (i)(k) 6,079 California State Public Works Board, Lease Revenue Bonds: 5,500 (Department of Corrections), Series C, 5.25% due 6/01/2028 5,802 3,755 (Department of General Services), Series D, 5.25% due 6/01/2028 3,961 5,250 (Department of Mental Health - Coalinga State Hospital), Series A, 5.125% due 6/01/2029 5,449 California State, Various Purpose, GO: 12,000 5.25% due 11/01/2029 12,715 32,000 Refunding, 5% due 6/01/2034 32,976 California Statewide Communities Development Authority: 7,740 Health Facility Revenue Bonds (Memorial Health Services), Series A, 6% due 10/01/2023 8,763 4,205 Water Revenue Bonds (Pooled Financing Program), Series C, 5.25% due 10/01/2034 (g) 4,489 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 GAN Grant Anticipation Notes 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 January 31, 2005 (concluded) (in Thousands) Face State Amount Municipal Bonds Value California $ 7,500 Desert Sands, California, Unified School District, GO (Election of 2001), (concluded) 5% due 6/01/2029 (g) $ 7,876 5,800 Fairfield-Suisun, California, Unified School District, GO (Election of 2002), 5.50% due 8/01/2028 (i) 6,458 5,015 Gavilan, California, Joint Community College District, GO, DRIVERS, Series 587-Z, 8.854% due 8/01/2012 (a)(k) 6,152 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds: 13,500 RIB, Series 920X, 8.91% due 6/01/2033 (c)(k) 16,084 1,500 Series B, 5.50% due 6/01/2033 1,610 12,000 Series B, 5.625% due 6/01/2038 (c) 13,209 2,500 Series B, 5.50% due 6/01/2043 2,672 1,000 Long Beach, California, Harbor Revenue Refunding Bonds, AMT, Series B, 5.20% due 5/15/2027 (i) 1,051 10,000 Los Angeles, California, Community College District, GO, Series A, 5.50% due 8/01/2018 (i) 11,284 5,000 Los Angeles, California, Harbor Department Revenue Bonds, RITR, AMT, Series RI-7, 10.225% due 11/01/2026 (i)(k) 5,689 Los Angeles, California, Unified School District, GO: 6,265 DRIVERS, Series 261, 8.657% due 7/01/2022 (c)(k) 7,482 13,800 Series A, 5% due 1/01/2028 (i) 14,496 11,775 Los Angeles, California, Water and Power Revenue Bonds (Power System), Series B, 5% due 7/01/2035 (g) 12,284 3,000 Palm Springs, California, Financing Authority, Lease Revenue Refunding Bonds (Convention Center Project), Series A, 5.50% due 11/01/2029 (i) 3,362 145 Port Oakland, California, Revenue Bonds, AMT, Series K, 5.75% due 11/01/2021 (c) 159 9,465 Port Oakland, California, Revenue Refunding Bonds, AMT, Series L, 5.375% due 11/01/2027 (c) 10,032 7,000 Port Oakland, California, Trust Receipts, Revenue Bonds, AMT, Class R, Series K, 9.324% due 11/01/2021 (c)(k) 8,385 Riverside County, California, Public Financing Authority, Tax Allocation Revenue Bonds (Redevelopment Projects) (e): 10,000 5% due 10/01/2035 10,364 15,350 5% due 10/01/2037 15,821 25,000 Sacramento County, California, Sanitation District Financing Authority Revenue Bonds, Series A, 5% due 12/01/2035 (a) 26,226 10,000 San Diego County, California, Water Authority, Water Revenue Bonds, COP, Series A, 5% due 5/01/2031 (g) 10,482 6,895 San Jose, California, Redevelopment Agency, Tax Allocation Refunding Bonds (Merged Area Redevelopment Project), 5.60% due 8/01/2019 (i) 7,513 8,310 Stockton, California, Public Financing Authority, Lease Revenue Bonds (Parking & Capital Projects), 5.25% due 9/01/2034 (c) 8,920 Colorado - 0.6% 6,050 Regional Transportation District of Colorado, Sales Tax Revenue Bonds, Series A, 5% due 11/01/2015 (a) 6,690 Florida - 6.6% 3,500 Escambia County, Florida, Health Facilities Authority, Health Facility Revenue Bonds (Florida Health Care Facility Loan), 5.95% due 7/01/2020 (a) 3,553 13,745 Florida State Board of Education, Public Education, Capital Outlay, GO, Refunding, Series A, 5% due 6/01/2016 (c) 15,412 14,175 Florida State Turnpike Authority, Turnpike Revenue Refunding Bonds (Department of Transportation), Series A, 5% due 7/01/2015 (g) 15,731 4,500 Miami-Dade County, Florida, Aviation Revenue Bonds (Miami International Airport), Series B, 5% due 10/01/2031 (c) 4,710 Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT (c): 10,750 5.375% due 10/01/2025 11,432 1,000 5.375% due 10/01/2027 1,057 Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds: 5,000 Adventist Health System, 5.625% due 11/15/2032 5,330 2,000 Orlando Regional Healthcare, 5.75% due 12/01/2032 2,138 10,000 Orlando and Orange County, Florida, Expressway Authority Revenue Bonds, Series B, 5% due 7/01/2035 (a) 10,432 Georgia - 6.9% Atlanta, Georgia, Airport General Revenue Refunding Bonds (g): 26,500 AMT, Series A, 5.125% due 1/01/2030 27,548 12,500 Series B, 5.25% due 1/01/2033 13,391 27,000 Atlanta, Georgia, Airport Passenger Facility Charge and Subordinate Lien General Revenue Bonds, Series J, 5% due 1/01/2034 (g) 28,113 1,200 Atlanta, Georgia, Water and Wastewater Revenue Bonds, VRDN, Series C, 1.84% due 11/01/2041 (g)(h) 1,200 3,600 Monroe County, Georgia, Development Authority, PCR (Oglethorpe Power Corporation-Scherer), VRDN, Series B, 1.83% due 1/01/2020 (a)(h) 3,600 Hawaii - 0.3% 2,000 Hawaii State, GO, Series CX, 5.50% due 2/01/2021 (g) 2,241 1,100 Hawaii State Highway Revenue Bonds, 5.50% due 7/01/2020 (g) 1,216 Illinois - 9.0% Chicago, Illinois, O'Hare International Airport, General Revenue Refunding Bonds, Third Lien (i): 3,000 AMT, Series C, 5.25% due 1/01/2024 3,198 5,000 Series A, 5% due 1/01/2029 5,194 4,690 Series A, 5% due 1/01/2030 4,868 Chicago, Illinois, O'Hare International Airport Revenue Bonds, AMT: 13,115 DRIVERS, Series 368, 9.813% due 7/01/2011 (i)(k) 16,491 8,600 DRIVERS, Series 369, 10.378% due 7/01/2011 (e)(k) 10,732 16,685 Third Lien, Series B-2, 5.25% due 1/01/2027 (i) 17,520 Chicago, Illinois, O'Hare International Airport Revenue Refunding Bonds, AMT: 8,200 DRIVERS, Series 653-Z, 8.814% due 1/01/2012 (g)(k) 8,972 1,500 Third Lien, Series C-2, 5.25% due 1/01/2034 (e) 1,568 10,000 Illinois State, GO, First Series, 5.50% due 4/01/2016 (g) 11,231 2,000 Illinois State Sales Tax Revenue Bonds, 6.125% due 6/15/2016 2,295 6,035 Mc Lean and Woodford Counties, Illinois, Community Unit, School District Number 005, GO, Refunding, 6.375% due 12/01/2016 (g) 7,166 4,800 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion), Series B, 5.75% due 6/15/2023 (i) 5,540 1,000 Regional Transportation Authority, Illinois, Revenue Bonds, Series C, 7.75% due 6/01/2020 (c) 1,424 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) 2,418 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A (c): 3,000 5.25% due 6/01/2026 3,275 14,000 5.25% due 6/01/2028 15,158 20,000 5.25% due 6/01/2029 21,590 8,000 Indianapolis, Indiana, Local Public Improvement Bond Bank Revenue Bonds (Waterworks Project), Series A, 5.125% due 7/01/2027 (i) 8,459 Kansas - 0.9% 8,500 Burlington, Kansas, PCR, Refunding (Kansas Gas and Electric Company Project), Series A, 5.30% due 6/01/2031 (i) 9,196 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) 4,113 15,000 Louisiana Public Facilities Authority, Revenue Refunding Bonds (Baton Rouge General Medical Center Project), 5.25% due 7/01/2033 (d)(i) 15,938 Massachusetts - 4.5% 2,500 Massachusetts State, HFA, Housing Development Revenue Refunding Bonds, Series B, 5.40% due 12/01/2028 (i) 2,580 7,550 Massachusetts State Port Authority Revenue Bonds, Series A, 5% due 7/01/2033 (i) 7,866 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds (c): 8,460 5.25% due 1/01/2025 9,253 6,160 5.25% due 1/01/2028 6,641 10,000 5.75% due 1/01/2032 11,317 10,000 5% due 1/01/2034 10,446 Michigan - 4.8% 9,360 Clarkston, Michigan, Community Schools, GO, 5.25% due 5/01/2029 (g) 10,052 19,900 Detroit, Michigan, Sewer Disposal Revenue Bonds, Senior Lien, VRDN, Series A, 1.84% due 7/01/2033 (g)(h) 19,900 2,845 Eastern Michigan University, Revenue Refunding Bonds, VRDN, 1.84% due 6/01/2027 (c)(h) 2,845 1,400 Michigan State Revenue Bonds, GAN, Series B, 1.83% due 9/15/2008 (g) 1,400 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Project), AMT (e): 8,000 Series A, 5.50% due 6/01/2030 8,577 5,000 Series C, 5.65% due 9/01/2029 5,347 2,945 Northern Michigan University Revenue Bonds, VRDN, 1.84% due 6/01/2031 (c)(h) 2,945 Minnesota - 1.1% 10,000 Minneapolis and Saint Paul, Minnesota, Metropolitan Airports Commission, Airport Revenue Bonds, Series A, 5.90% due 1/01/2029 (c) 11,202 Missouri - 0.3% 230 Missouri State Housing Development Commission, S/F Mortgage Revenue Bonds (Homeowner Loan), AMT, Series C-1, 7.15% due 3/01/2032 (l) 241 2,800 Saint Louis, Missouri, Airport Revenue Bonds (Airport Development Program), Series A, 5.625% due 7/01/2019 (i) 3,158 Nevada - 11.0% 25,000 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2, 5% due 7/01/2030 (c) 25,989 Clark County, Nevada, IDR (Southwest Gas Corporation Project), AMT: 12,675 Series A, 5.25% due 7/01/2034 (a) 13,274 12,000 Series D, 5.25% due 3/01/2038 (c) 12,444 6,000 Henderson, Nevada, Health Care Facilities Revenue Bonds (Catholic Healthcare West), Series A, 5.625% due 7/01/2024 6,369 5,000 Humboldt County, Nevada, PCR, Refunding (Sierra Pacific Project), 6.55% due 10/01/2013 (a) 5,244 3,000 Las Vegas New Convention and Visitors Authority Revenue Bonds, 6% due 7/01/2019 (a) 3,407 20,375 Nevada State, Nevada Municipal Bond Bank, GO, Series A, 5.50% due 11/01/2025 (c) 20,984 3,130 Reno, Nevada, Capital Improvement Revenue Bonds, 5.50% due 6/01/2019 (c) 3,510 Washoe County, Nevada, Gas Facilities Revenue Bonds (Sierra Pacific Power Company), AMT: 15,000 6.65% due 12/01/2017 (a) 15,196 5,000 6.55% due 9/01/2020 (i) 5,142 5,000 Washoe County, Nevada, Water Facility Revenue Bonds (Sierra Pacific Power Company), AMT, 6.65% due 6/01/2017 (i) 5,190 New Jersey - 11.6% 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) 19,152 New Jersey EDA, Cigarette Tax Revenue Bonds: 3,060 5.75% due 6/15/2029 3,249 2,610 5.50% due 6/15/2031 2,714 14,135 5.75% due 6/15/2034 14,909 New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A (i): 14,665 5.25% due 7/01/2031 15,852 15,000 5.25% due 7/01/2033 16,202 New Jersey EDA, School Facilities Construction Revenue Bonds, Series I: 5,500 5.25% due 9/01/2028 5,884 3,250 5.25% due 9/01/2029 3,467 23,960 New Jersey EDA, School Facilities Construction Revenue Refunding Bonds, Series K, 5.25% due 12/15/2014 (a) 27,181 10,000 New Jersey State, GO, Refunding, Series L, 5.25% due 7/15/2016 (a) 11,416 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 1,657 1,380 5.50% due 1/01/2028 1,521 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 1,609 895 New Mexico Mortgage Finance Authority, S/F Mortgage Revenue Bonds, AMT, Series C-2, 6.95% due 9/01/2031 (l) 916 New York - 13.2% Long Island Power Authority, New York, Electric System Revenue Bonds, Series A: 10,250 5.10% due 9/01/2029 10,711 12,500 5% due 9/01/2034 (a) 13,071 12,500 Metropolitan Transportation Authority, New York, Commuter Facilities Revenue Refunding Bonds, Series B, 5.125% due 7/01/2024 (a)(b) 13,285 40,000 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) 41,874 New York City, New York, GO: 13,840 Series B, 5.875% due 8/01/2016 (i) 15,900 10,000 Series J, 5.25% due 5/15/2024 10,752 1,000 Series J, 5.25% due 5/15/2025 1,076 6,000 Sub-Series C-1, 5.25% due 8/15/2026 6,452 7,000 New York State Urban Development Corporation, Personal Income Tax Revenue Bonds (State Facilities), Series A-1, 5% due 3/15/2029 (c) 7,345 19,500 Port Authority of New York and New Jersey, Consolidated Revenue Bonds, AMT, 137th Series, 5.125% due 7/15/2030 (g) 20,478 North Dakota - 0.1% 1,230 North Dakota State Housing Finance Agency, Home Mortgage Revenue Refunding Bonds (Housing Finance Program), AMT, Series A, 6.40% due 7/01/2020 1,321 Ohio - 0.6% 1,500 Franklin County, Ohio, Hospital Improvement Revenue Bonds (Children's Hospital Project), 5.50% due 5/01/2028 (a) 1,655 5,020 Montgomery County, Ohio, Revenue Bonds (Catholic Health Initiatives), Series A, 5% due 5/01/2032 5,184 Oklahoma - 0.9% 7,500 Oklahoma State, IDR, Refunding, DRIVERS, Series 455, 9.344% due 2/15/2008 (i)(k) 9,153 Oregon - 2.4% Multnomah-Clackamas Counties, Oregon, Gresham-Barlo School District Number 10JT, GO (g): 2,625 5.50% due 6/15/2016 2,950 2,525 5.50% due 6/15/2017 2,837 3,035 5.50% due 6/15/2018 3,410 Portland, Oregon, Sewer System Revenue Bonds, Series A (c): 5,000 5.75% due 8/01/2019 5,633 10,000 5.75% due 8/01/2020 11,222 Pennsylvania - 3.8% 7,800 Pennsylvania State Turnpike Commission, Turnpike Revenue Bonds, DRIVERS, Series 460-Z, 8.864% due 6/01/2012 (a)(k) 9,525 Philadelphia, Pennsylvania, School District, GO (c): 5,175 Series B, 5.625% due 8/01/2021 5,786 12,115 Series D, 5.125% due 6/01/2034 12,784 6,000 Series D, 5.25% due 6/01/2034 6,439 5,000 Sayre, Pennsylvania, Health Care Facilities Authority Revenue Bonds (Guthrie Health Issue), Series B, 7.125% due 12/01/2031 (a) 5,934 South Carolina - 2.3% 1,435 South Carolina Housing Finance and Development Authority, Mortgage Revenue Refunding Bonds, AMT, Series A-2, 6.35% due 7/01/2019 (g) 1,483 18,030 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2029 (a) 18,786 4,200 Spartanburg County, South Carolina, Solid Waste Disposal Facilities Revenue Bonds (BMW Project), AMT, 7.55% due 11/01/2024 4,403 Tennessee - 1.0% Tennessee HDA Revenue Bonds (Homeownership Program), Series 2B, AMT: 1,795 6.05% due 7/01/2012 1,849 2,250 6.15% due 7/01/2014 2,298 Tennessee HDA, Revenue Refunding Bonds (Homeownership Program), AMT, Series A (g): 3,940 5.25% due 7/01/2022 4,132 2,790 5.35% due 1/01/2026 2,898 Texas - 12.2% 7,500 Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises Inc.), Trust Certificates, Second Tier, Series B, 5.75% due 1/01/2032 7,779 Bell County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Scott & White Memorial Hospital), VRDN (h)(i): 4,010 Series B-1, 1.84% due 8/15/2029 4,010 3,000 Series B-2, 1.84% due 8/15/2029 3,000 1,880 Bexar, Texas, Metropolitan Water District, Waterworks System Revenue Refunding Bonds, 6.35% due 5/01/2025 (i) 1,935 10,500 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, DRIVERS, AMT, Series 353, 8.814% due 5/01/2011 (i)(k) 11,972 7,500 Dallas-Fort Worth, Texas, International Airport Revenue Refunding Bonds, DRIVERS, AMT, Series 336Z, 9.639% due 11/01/2026 (c)(k) 8,587 Harris County, Houston, Texas, Sports Authority, Revenue Refunding Bonds, Senior Lien, Series G (i): 1,665 5.75% due 11/15/2019 1,890 3,500 5.75% due 11/15/2020 3,972 10,000 5.25% due 11/15/2030 10,523 3,000 Harris County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Texas Children's Hospital), VRDN, Series B-1, 1.84% due 10/01/2029 (h)(i) 3,000 Houston, Texas, Airport System Revenue Refunding Bonds (g): 15,000 RIB, Series 845X, 8.87% due 7/01/2030 (k) 17,782 9,500 Sub-Lien, AMT, Series A, 5.70% due 7/01/2030 9,601 4,875 Texas State Department of Housing and Community Affairs, S/F Mortgage Revenue Bonds, AMT, Series A, 5.45% due 9/01/2023 (i)(l) 5,122 10,000 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.50% due 8/15/2039 (a) 11,041 4,000 Texas Technical University, Financing System Revenue Bonds, Seventh Series, 5.50% due 8/15/2019 (i) 4,474 10,000 Travis County, Texas, Health Facilities Development Corporation Revenue Refunding Bonds, RITR, Series 4, 9.514% due 11/15/2024 (a)(k) 12,792 11,240 University of Houston, Texas, University Revenue Bonds, 5.50% due 2/15/2030 (i) 12,238 Vermont - 0.1% 1,095 Vermont HFA, S/F Housing Revenue Bonds, AMT, Series 12B, 6.30% due 11/01/2019 (g) 1,097 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) 2,744 Washington - 15.8% Bellevue, Washington, GO, Refunding (i): 2,545 5.25% due 12/01/2026 2,775 2,455 5.25% due 12/01/2027 2,665 2,850 5.25% due 12/01/2028 3,082 3,000 5.25% due 12/01/2029 3,234 17,600 5% due 12/01/2034 18,320 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) 3,195 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 7,253 6,000 Series C, 5.65% due 7/01/2032 6,460 10,000 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Project Number 1), Series B, 6% due 7/01/2017 (i) 11,599 3,500 Port Seattle, Washington, Revenue Bonds, Series A, 5.50% due 2/01/2026 (i) 3,826 19,565 Port Seattle, Washington, Revenue Refunding Bonds, Series B, AMT, 5.20% due 7/01/2029 (i) 20,438 10,000 Radford Court Properties, Washington, Student Housing Revenue Bonds, 5.75% due 6/01/2032 (i) 11,205 1,720 Seattle, Washington, Drain and Wastewater Utility Revenue Bonds, 5.75% due 11/01/2029 (i) 1,923 9,250 Seattle, Washington, Municipal Light and Power Revenue Bonds, 6% due 10/01/2009 (i)(m) 10,595 2,000 Seattle, Washington, Water System Revenue Bonds, Series B, 6% due 7/01/2029 (c) 2,246 Skagit County, Washington, Public Hospital District, GO, Series A (i): 4,945 5.25% due 12/01/2025 5,414 5,450 5.25% due 12/01/2026 5,943 7,250 Tacoma, Washington, Solid Waste Utility, Revenue Refunding Bonds, Series B, 5.50% due 12/01/2019 (a) 7,845 2,000 University of Washington, University Revenue Bonds (Student Facilities Fee), 5.75% due 6/01/2025 (g) 2,241 Washington State, GO: 10,000 DRIVERS, Series 438Z, 9.094% due 1/01/2009 (i)(k) 12,059 10,235 Series B, 6% due 1/01/2015 (g) 11,549 5,695 Series B, 6% due 1/01/2017 (g) 6,426 7,000 Washington State Health Care Facilities Authority Revenue Bonds (Providence Health System), Series A, 5.25% due 10/01/2021 (i) 7,551 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) 6,062 Wisconsin - 0.3% 3,395 Wisconsin State Health and Educational Facilities Authority Revenue Bonds (Synergyhealth Inc.), 6% due 11/15/2033 3,573 Puerto Rico - 1.1% 11,000 Puerto Rico Public Buildings Authority, Government Facilities, Revenue Refunding Bonds, Series I, 5.25% due 7/01/2030 11,767 Total Investments (Cost - $1,550,939*) - 155.2% 1,653,291 Liabilities in Excess of Other Assets - (1.7%) (17,669) Preferred Stock, at Redemption Value - (53.5%) (570,041) ------------ Net Assets Applicable to Common Stock - 100.0% $ 1,065,581 ============ *The cost and unrealized appreciation (depreciation) of investments as of January 31, 2005, computed for federal income tax purposes, were as follows: (in Thousands) Aggregate cost $1,550,939 ========== Gross unrealized appreciation $ 102,581 Gross unrealized depreciation (229) ---------- Net unrealized appreciation $ 102,352 ========== (a)AMBAC Insured. (b)Escrowed to maturity. (c)FGIC Insured. (d)FHA Insured. (e)XL Capital Insured. (f)Represents a zero coupon; the interest rate shown reflects the effective yield at the time of purchase by the Fund. (g)FSA Insured. (h)Security has a maturity of more than one year, but has variable rate and demand features, which 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)Prerefunded. Investments in companies considered to be an affiliate of the Fund (such companies are defined as "Affiliated Companies" in Section 2(a)(3) of the Investment Company Act of 1940) were as follows: (in Thousands) Affiliate Net Dividend Activity Income Merrill Lynch Institutional Tax-Exempt Fund (131) $34 Forward interest rate swaps outstanding as of January 31, 2005 were as follows: (in Thousands) Notional Unrealized Amount Depreciation Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate of 4.774% Broker, Morgan Stanley Capital Services Inc. Expires March 2015 $ 21 $ (461) Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate of 3.615% Broker, JPMorgan Chase Bank Expires April 2015 $ 226 (1,461) Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index Rate and pay a fixed rate of 4.128% Broker, JPMorgan Chase Bank Expires August 2026 $ 15 (469) ---------- Total $ (1,930) ========== 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., President MuniYield Insured Fund, Inc. Date: March 21, 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., President MuniYield Insured Fund, Inc. Date: March 21, 2005 By: /s/ Donald C. Burke Donald C. Burke, Chief Financial Officer MuniYield Insured Fund, Inc. Date: March 21, 2005