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 811-5611 Name of Fund: BlackRock MuniVest 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, BlackRock MuniVest 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: 08/31/2007 Date of reporting period: 03/01/07 - 05/31/07 Item 1 - Schedule of Investments BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- Alabama - 3.9% $ 2,550 Camden, Alabama, IDB, Exempt Facilities Revenue Bonds (Weyerhaeuser Company), Series A, 6.125% due 12/01/2024 $ 2,777 3,500 Huntsville, Alabama, Health Care Authority Revenue Bonds, Series A, 5.75% due 6/01/2011 (a) 3,764 5,000 Huntsville, Alabama, Health Care Authority Revenue Bonds, Series B, 5.75% due 6/01/2012 (a) 5,443 6,500 Prattville, Alabama, IDB, Environmental Improvement Revenue Bonds (International Paper Company Projects), AMT, Series A, 4.75% due 12/01/2030 6,273 5,000 Selma, Alabama, IDB, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), Series B, 5.50% due 5/01/2020 5,264 ----------------------------------------------------------------------------------------------------------------------------------- Arizona - 1.9% 4,100 Maricopa County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project 1), Series A, 6.75% due 7/01/2029 4,172 2,100 Pima County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project), Series E, 7.25% due 7/01/2031 2,324 500 Pima County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project), Series I, 6.10% due 7/01/2024 531 1,000 Pima County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project), Series I, 6.30% due 7/01/2031 1,071 560 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project II), Series A, 6.75% due 7/01/2011 (a) 617 1,005 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project II), Series A, 6.75% due 7/01/2021 1,076 1,545 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project), Series O, 5% due 7/01/2026 1,541 ----------------------------------------------------------------------------------------------------------------------------------- California - 22.4% 9,290 California HFA, Home Mortgage Revenue Bonds, AMT, Series E, 4.75% due 2/01/2030 9,150 18,850 California Health Facilities Financing Authority Revenue Bonds (Kaiser Permanente), Series A, 5.25% due 4/01/2039 19,495 ----------------------------------------------------------------------------------------------------------------------------------- Portfolio Abbreviations To simplify the listings of BlackRock MuniVest 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) 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 IDB Industrial Development Board IDR Industrial Development Revenue Bonds M/F Multi-Family PCR Pollution Control Revenue Bonds RIB Residual Interest Bonds S/F Single-Family VRDN Variable Rate Demand Notes BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 10,665 California State, GO, 5.50% due 4/01/2014 (a) $ 11,699 10 California State, GO, 5.50% due 4/01/2030 11 5,000 California State Public Works Board, Lease Revenue Bonds (Department of Corrections), Series C, 5.50% due 6/01/2022 5,420 6,000 California State Public Works Board, Lease Revenue Bonds (Department of Corrections), Series C, 5.50% due 6/01/2023 6,507 11,075 California State Public Works Board, Lease Revenue Bonds (Department of Mental Health - Coalinga State Hospital), Series A, 5.125% due 6/01/2029 11,527 11,250 California State, Various Purpose, GO, 5.50% due 11/01/2033 12,111 5,240 California Statewide Communities Development Authority, Health Facility Revenue Bonds (Memorial Health Services), Series A, 6% due 10/01/2023 5,667 1,250 Chula Vista, California, IDR (San Diego Gas and Electric Company), AMT, Series B, 5% due 12/01/2027 1,291 10,725 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series A-3, 7.875% due 6/01/2013 (a) 12,942 3,750 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series A-4, 7.80% due 6/01/2013 (a) 4,511 1,425 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series A-5, 7.875% due 6/01/2013 (a) 1,719 13,900 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B, 5.375% due 6/01/2010 (a) 14,507 14,800 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Refunding Bonds, Senior Series A-1, 5.125% due 6/01/2047 14,676 3,300 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Refunding Bonds, Senior Series A-1, 5.75% due 6/01/2047 3,492 ----------------------------------------------------------------------------------------------------------------------------------- Colorado - 1.1% 2,500 Colorado HFA, Revenue Refunding Bonds (Adventist Health System/Sunbelt Obligor Group), Series D, 5.125% due 11/15/2029 2,584 560 Colorado HFA, Revenue Refunding Bonds (S/F Program), AMT, Senior Series A-2, 6.60% due 5/01/2028 575 200 Colorado HFA, Revenue Refunding Bonds (S/F Program), AMT, Senior Series A-2, 7.50% due 4/01/2031 201 3,000 Colorado Health Facilities Authority Revenue Bonds (Lutheran Medical Center), Series A, 5.25% due 6/01/2034 3,074 ----------------------------------------------------------------------------------------------------------------------------------- Connecticut - 0.5% 2,810 Mohegan Tribe Indians Gaming Authority, Connecticut, Public Improvement Revenue Refunding Bonds (Priority Distribution), 6.25% due 1/01/2031 2,974 ----------------------------------------------------------------------------------------------------------------------------------- Florida - 4.8% 6,000 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25% due 11/15/2036 6,212 11,460 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Refunding Bonds (Adventist Health System), Series G, 5.125% due 11/15/2032 11,740 10,320 Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), 5.625% due 11/15/2012 (a) 11,239 ----------------------------------------------------------------------------------------------------------------------------------- BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- Georgia - 3.4% $ 1,100 Gainesville, Georgia, Redevelopment Authority, Educational Facilities Revenue Refunding Bonds (Riverside Military Academy), 5.125% due 3/01/2037 $ 1,115 250 Georgia Municipal Electric Authority, Power Revenue Refunding Bonds, Series W, 6.60% due 1/01/2018 (e) 284 4,600 Georgia Municipal Electric Authority, Power Revenue Refunding Bonds, Series W, 6.60% due 1/01/2018 5,261 250 Georgia Municipal Electric Authority, Power Revenue Refunding Bonds, Series Y, 10% due 1/01/2010 (e) 287 4,390 Milledgeville-Baldwin County, Georgia, Development Authority Revenue Bonds (Georgia College and State University Foundation), 5.50% due 9/01/2014 (a) 4,671 3,500 Milledgeville-Baldwin County, Georgia, Development Authority Revenue Bonds (Georgia College and State University Foundation), 5.625% due 9/01/2014 (a) 3,748 4,785 Monroe County, Georgia, Development Authority, PCR, Refunding (Oglethorpe Power Corporation-Scherer), Series A, 6.80% due 1/01/2011 5,221 ----------------------------------------------------------------------------------------------------------------------------------- Idaho - 0.1% 330 Idaho Housing Agency, S/F Mortgage Revenue Refunding Bonds, AMT, Series E-2, 6.90% due 1/01/2027 338 ----------------------------------------------------------------------------------------------------------------------------------- Illinois - 11.5% 5,000 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A, 5.75% due 1/01/2019 (c) 5,318 11,200 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 6% due 1/01/2029 (n) 12,444 75 Chicago, Illinois, S/F Mortgage Revenue Bonds, AMT, Series C, 7% due 3/01/2032 (d)(k) 77 10,000 Hodgkins, Illinois, Environmental Improvement Revenue Bonds (Metro Biosolids Management LLC Project), AMT, 6% due 11/01/2023 10,312 2,140 Illinois Development Finance Authority Revenue Bonds (Community Rehabilitation Providers Facilities), Series A, 6.50% due 7/01/2022 2,299 1,365 Illinois Development Finance Authority, Revenue Refunding Bonds (Community Rehabilitation Providers Facilities), Series A, 6% due 7/01/2015 1,380 455 Illinois HDA, Revenue Refunding Bonds (M/F Program), Series 5, 6.75% due 9/01/2023 460 2,695 Illinois State Finance Authority, Revenue Bonds (Community Rehabilitation Providers Facilities), 4.625% due 7/01/2027 2,631 13 Kane and De Kalb Counties, Illinois, Community Unit School District Number 302, GO, DRIVERS, Series 283, 7.313% due 2/01/2018 (f)(m) 15 1,005 McLean and Woodford Counties, Illinois, Community Unit School District Number 005, GO, Refunding, 6.25% due 12/01/2014 (i) 1,101 845 McLean and Woodford Counties, Illinois, Community Unit School District Number 005, GO, Refunding, 6.375% due 12/01/2016 (i) 931 18,550 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project), Series B, 5.75% due 6/15/2023 (c) 20,099 BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 3,500 Regional Transportation Authority, Illinois, Revenue Bonds, Series A, 7.20% due 11/01/2020 (h) $ 4,267 4,000 Regional Transportation Authority, Illinois, Revenue Bonds, Series C, 7.75% due 6/01/2020 (f) 5,368 1,870 Will County, Illinois, School District Number 122 (New Lenox Elementary), GO, Series A, 6.50% due 11/01/2010 (a)(i) 2,026 505 Will County, Illinois, School District Number 122 (New Lenox Elementary), GO, Series A, 6.50% due 11/01/2013 (i) 545 ----------------------------------------------------------------------------------------------------------------------------------- Indiana - 9.0% 16,350 Indiana Health and Educational Facilities Financing Authority, Hospital Revenue Bonds (Clarian Health Obligation), Series A, 5.25% due 2/15/2040 16,820 6,500 Indiana Health and Educational Facilities Financing Authority, Hospital Revenue Refunding Bonds (Clarian Health Obligation), Series B, 5% due 2/15/2033 6,563 4,290 Indiana State, HFA, S/F Mortgage Revenue Refunding Bonds, Series A, 6.80% due 1/01/2017 (j) 4,390 8,195 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A, 6.80% due 12/01/2016 9,521 15,335 Indianapolis, Indiana, Local Public Improvement Bond Bank, Revenue Refunding Bonds, Series D, 6.75% due 2/01/2014 17,144 ----------------------------------------------------------------------------------------------------------------------------------- Kansas - 0.6% 3,805 Sedgwick and Shawnee Counties, Kansas, S/F Mortgage Revenue Bonds (Mortgage-Backed Securities Program), AMT, Series A-4, 5.95% due 12/01/2033 (d) 3,857 ----------------------------------------------------------------------------------------------------------------------------------- Kentucky - 3.5% 20,100 Louisville and Jefferson County, Kentucky, Metropolitan Government Health System, Revenue Refunding Bonds (Norton Healthcare, Inc.), 5.25% due 10/01/2036 20,788 ----------------------------------------------------------------------------------------------------------------------------------- Louisiana - 3.1% 6,220 Louisiana Public Facilities Authority, Hospital Revenue Bonds (Franciscan Missionaries of Our Lady Health System, Inc.), Series A, 5% due 8/15/2033 6,328 11,660 Louisiana Public Facilities Authority, Hospital Revenue Bonds (Franciscan Missionaries of Our Lady Health System, Inc.), Series A, 5.25% due 8/15/2036 12,076 ----------------------------------------------------------------------------------------------------------------------------------- Maine - 0.3% 775 Portland, Maine, Housing Development Corporation, Senior Living Revenue Bonds (Avesta Housing Development Corporation Project), Series A, 5.70% due 8/01/2021 808 1,190 Portland, Maine, Housing Development Corporation, Senior Living Revenue Bonds (Avesta Housing Development Corporation Project), Series A, 6% due 2/01/2034 1,251 ----------------------------------------------------------------------------------------------------------------------------------- Maryland - 2.0% 9,030 Maryland State Community Development Administration, Department of Housing and Community Development, Residential Revenue Refunding Bonds, AMT, Series D, 4.85% due 9/01/2037 8,930 3,250 Maryland State Community Development Administration, Department of Housing and Community Development, Residential Revenue Refunding Bonds, AMT, Series D, 4.90% due 9/01/2042 3,212 ----------------------------------------------------------------------------------------------------------------------------------- Massachusetts - 8.1% 2,035 Boston, Massachusetts, Water and Sewer Commission Revenue Bonds, 9.25% due 1/01/2011 (e) 2,344 3,010 Massachusetts Bay Transportation Authority, Revenue Refunding Bonds (General Transportation System), Series A, 7% due 3/01/2019 3,648 3,955 Massachusetts State, HFA, Housing Revenue Refunding Bonds, AMT, Series D, 4.85% due 6/01/2040 3,885 30,000 Massachusetts State Water Resource Authority Revenue Bonds, Series A, 6.50% due 7/15/2019 (e) 35,312 3,480 Massachusetts State Water Resource Authority, Revenue Refunding Bonds, Series A, 6% due 8/01/2010 (a)(f) 3,728 ----------------------------------------------------------------------------------------------------------------------------------- BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- Michigan - 8.6% $ 2,500 Delta County, Michigan, Economic Development Corporation, Environmental Improvement Revenue Refunding Bonds (Mead Westvaco-Escanaba), Series A, 6.25% due 4/15/2012 (a) $ 2,754 3,715 Macomb County, Michigan, Hospital Finance Authority, Hospital Revenue Bonds (Mount Clemens General Hospital), Series B, 5.75% due 11/15/2025 3,879 4,250 Macomb County, Michigan, Hospital Finance Authority, Hospital Revenue Bonds (Mount Clemens General Hospital), Series B, 5.875% due 11/15/2034 4,491 1,900 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds (Crittenton Hospital), Series A, 5.625% due 3/01/2027 2,017 3,125 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds (Oakwood Obligated Group), Series A, 5% due 7/15/2025 3,182 2,000 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds (Oakwood Obligated Group), Series A, 5% due 7/15/2037 2,020 5,500 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds (Sparrow Obligated Group), 5% due 11/15/2031 5,598 3,650 Michigan State Hospital Finance Authority Revenue Bonds (Mid-Michigan Obligor Group), Series A, 5% due 4/15/2036 3,697 9,000 Michigan State Hospital Finance Authority Revenue Bonds (Trinity Health Credit Group), Series A, 5% due 12/01/2031 9,233 3,000 Michigan State Hospital Finance Authority, Revenue Refunding Bonds (Henry Ford Health System), Series A, 5.25% due 11/15/2032 3,122 10,600 Michigan State Hospital Finance Authority, Revenue Refunding Bonds (Henry Ford Health System), Series A, 5% due 11/15/2038 10,751 1,000 Michigan State Hospital Finance Authority, Revenue Refunding Bonds (Sinai Hospital), 6.70% due 1/01/2026 1,008 ----------------------------------------------------------------------------------------------------------------------------------- Minnesota - 1.5% 7,235 Minneapolis, Minnesota, Health Care System Revenue Bonds (Allina Health System), Series A, 5.75% due 11/15/2032 7,690 1,405 Saint Cloud, Minnesota, Health Care Revenue Refunding Bonds (Saint Cloud Hospital Obligation Group), Series A, 6.25% due 5/01/2017 (i) 1,503 ----------------------------------------------------------------------------------------------------------------------------------- Mississippi - 6.2% 9,160 Lowndes County, Mississippi, Solid Waste Disposal and PCR, Refunding (Weyerhaeuser Company Project), Series A, 6.80% due 4/01/2022 11,095 4,500 Lowndes County, Mississippi, Solid Waste Disposal and PCR, Refunding (Weyerhaeuser Company Project), Series B, 6.70% due 4/01/2022 5,405 20,705 Mississippi Business Finance Corporation, Mississippi, PCR, Refunding (System Energy Resources Inc. Project), 5.875% due 4/01/2022 20,917 ----------------------------------------------------------------------------------------------------------------------------------- Missouri - 0.5% 2,600 Missouri State Development Finance Board, Infrastructure Facilities Revenue Refunding Bonds (Branson), Series A, 5.50% due 12/01/2032 2,716 220 Missouri State Housing Development Commission, S/F Mortgage Revenue Bonds (Homeowner Loan), AMT, Series A, 7.50% due 3/01/2031 (d) 230 ----------------------------------------------------------------------------------------------------------------------------------- BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- Montana - 1.0% $ 6,000 Forsyth, Montana, PCR, Refunding (Portland General Electric Company), Series A, 5.20% due 5/01/2033 $ 6,118 ----------------------------------------------------------------------------------------------------------------------------------- Nebraska - 0.1% 285 Nebraska Investment Finance Authority, S/F Housing Revenue Bonds, AMT, Series C, 6.30% due 9/01/2028 (d)(k) 287 ----------------------------------------------------------------------------------------------------------------------------------- Nevada - 0.2% 1,140 Nevada Housing Division Revenue Bonds (Multi-Unit Housing), AMT, Issue B, 7.45% due 10/01/2017 (b) 1,142 5 Nevada Housing Division Revenue Bonds (S/F Program), AMT, Series A, 6.55% due 10/01/2012 (j) 5 ----------------------------------------------------------------------------------------------------------------------------------- New Hampshire - 0.5% 2,675 New Hampshire Health and Education Facilities Authority, Revenue Refunding Bonds (Elliot Hospital), Series B, 5.60% due 10/01/2022 2,817 ----------------------------------------------------------------------------------------------------------------------------------- New Jersey - 6.1% 9,080 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2024 9,498 2,885 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.75% due 6/15/2029 3,099 2,855 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2031 3,008 6,695 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.75% due 6/15/2034 7,155 5,980 Tobacco Settlement Financing Corporation of New Jersey, Asset-Backed Revenue Bonds, 7% due 6/01/2013 (a) 6,953 7,500 Tobacco Settlement Financing Corporation of New Jersey, Revenue Refunding Bonds, Series 1A, 5% due 6/01/2041 7,312 ----------------------------------------------------------------------------------------------------------------------------------- New Mexico - 0.6% 3,300 Farmington, New Mexico, PCR, Refunding (Public Service Company of New Mexico - San Juan Project), Series A, 5.80% due 4/01/2022 3,331 ----------------------------------------------------------------------------------------------------------------------------------- New York - 1.9% 400 Metropolitan Transportation Authority, New York, Dedicated Tax Fund, Revenue Refunding Bonds, VRDN, Series B, 3.82% due 11/01/2022 (i)(l) 400 1,125 New York City, New York, City Transitional Finance Authority Revenue Bonds, RIB, Series 283, 8.40% due 11/15/2015 (m) 1,298 965 New York City, New York, GO, Refunding, Series A, 6.375% due 5/15/2014 (f) 1,040 6,480 New York City, New York, GO, Series F, 5.25% due 1/15/2033 6,791 20 New York City, New York, GO, Series I, 6.25% due 4/15/2017 (n) 20 400 New York State Local Government Assistance Corporation, Revenue Refunding Bonds, Sub-Lien, VRDN, Series 4V, 3.73% due 4/01/2022 (i)(l) 400 1,200 Triborough Bridge and Tunnel Authority, New York, General Purpose Revenue Refunding Bonds, VRDN, Series C, 3.70% due 1/01/2032 (h)(l) 1,200 ----------------------------------------------------------------------------------------------------------------------------------- North Carolina - 0.7% 4,105 Gaston County, North Carolina, Industrial Facilities and Pollution Control Financing Authority, Revenue Bonds (National Gypsum Company Project), AMT, 5.75% due 8/01/2035 4,305 ----------------------------------------------------------------------------------------------------------------------------------- Ohio - 0.6% 2,500 Ohio HFA, Mortgage Revenue Refunding Bonds, AMT, Series A, 4.90% due 9/01/2036 (o) 2,488 1,000 Richland County, Ohio, Hospital Facilities Revenue Refunding Bonds (MedCentral Health System), 5.25% due 11/15/2036 1,035 ----------------------------------------------------------------------------------------------------------------------------------- Oklahoma - 1.0% 5,750 Oklahoma Development Finance Authority, Revenue Refunding Bonds (St. John Health System), 5% due 2/15/2038 5,865 ----------------------------------------------------------------------------------------------------------------------------------- Pennsylvania - 4.1% 2,440 Pennsylvania State Higher Education Assistance Agency Revenue Bonds, Capital Acquisition, 6.125% due 12/15/2010 (a)(c) 2,623 BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 6,250 Pennsylvania State Higher Educational Facilities Authority Revenue Bonds (University of Pennsylvania Medical Center Health System), Series A, 6% due 1/15/2031 $ 6,704 1,000 Philadelphia, Pennsylvania, Authority for Industrial Development, Senior Living Revenue Bonds (Arbor House Inc. Project), Series E, 6.10% due 7/01/2033 1,057 1,355 Philadelphia, Pennsylvania, Authority for Industrial Development, Senior Living Revenue Bonds (Rieder House Project), Series A, 6.10% due 7/01/2033 1,432 9,280 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Bonds (Guthrie Healthcare System), Series B, 7.125% due 12/01/2011 (a) 11,062 1,340 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Refunding Bonds (Guthrie Healthcare System), Series A, 6.25% due 12/01/2011 (a) 1,478 410 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Refunding Bonds (Guthrie Healthcare System), Series A, 6.25% due 12/01/2018 445 ----------------------------------------------------------------------------------------------------------------------------------- South Carolina - 2.1% 1,000 Georgetown County, South Carolina, Environmental Improvement Revenue Refunding Bonds (International Paper Company Project), AMT, Series A, 5.55% due 12/01/2029 1,050 3,500 Lexington County, South Carolina, Health Services District Inc., Hospital Revenue Refunding and Improvement Bonds, 5.50% due 11/01/2032 3,669 2,450 Medical University Hospital Authority, South Carolina, Hospital Facilities Revenue Refunding Bonds, 6.50% due 8/15/2012 (a) 2,749 5,000 Richland County, South Carolina, Environmental Improvement Revenue Refunding Bonds (International Paper), AMT, 6.10% due 4/01/2023 5,398 ----------------------------------------------------------------------------------------------------------------------------------- South Dakota - 0.4% 2,605 South Dakota State Health and Educational Facilities Authority Revenue Bonds (Sanford Health), 5% due 11/01/2040 2,659 ----------------------------------------------------------------------------------------------------------------------------------- Tennessee - 1.6% 2,000 McMinn County, Tennessee, IDB, Solid Waste Revenue Bonds (Recycling Facility-Calhoun Newsprint), AMT, 7.40% due 12/01/2022 2,027 6,500 Shelby County, Tennessee, Health, Educational and Housing Facility Board, Hospital Revenue Refunding Bonds (Methodist Healthcare), 6.50% due 9/01/2012 (a) 7,298 ----------------------------------------------------------------------------------------------------------------------------------- Texas - 14.1% 7,290 Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises, Inc.), First Tier, Series A, 6.70% due 1/01/2011 (a) 7,963 3,055 Brazos River Authority, Texas, PCR, Refunding (TXU Energy Company LLC Project), AMT, Series A, 7.70% due 4/01/2033 3,437 3,345 Brazos River, Texas, Harbor Navigation District, Brazoria County Environmental (Dow Chemical Company Project), Series B-2, 4.95% due 5/15/2033 3,366 11,460 Brazos River, Texas, Harbor Navigation District, Brazoria County Environmental Revenue Refunding Bonds (Dow Chemical Company Project), AMT, Series A-7, 6.625% due 5/15/2033 12,521 3,000 Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project), 6.875% due 10/01/2010 (a)(g) 3,302 BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 10,250 Guadalupe-Blanco River Authority, Texas, Sewage and Solid Waste Disposal Facility Revenue Bonds (E. I. du Pont de Nemours and Company Project), AMT, 6.40% due 4/01/2026 $ 10,367 6,000 Gulf Coast Waste Disposal Authority, Texas, Revenue Refunding Bonds (International Paper Company), AMT, Series A, 6.10% due 8/01/2024 6,367 5,500 Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Senior Lien, Series G, 5.75% due 11/15/2020 (c) 5,866 1,790 Houston, Texas, Industrial Development Corporation Revenue Bonds (Air Cargo), AMT, 6.375% due 1/01/2023 1,909 1,875 Mansfield, Texas, Independent School District, GO, Refunding, 6.625% due 2/15/2010 (a) 2,007 155 Mansfield, Texas, Independent School District, GO, Refunding, 6.625% due 2/15/2015 166 9,355 Matagorda County, Texas, Navigation District Number 1, Revenue Refunding Bonds (Centerpoint Energy Project), 5.60% due 3/01/2027 9,891 5,225 Midway, Texas, Independent School District, GO, Refunding, 6.125% due 8/15/2014 5,563 2,700 Port Corpus Christi, Texas, Revenue Refunding Bonds (Celanese Project), Series A, 6.45% due 11/01/2030 2,884 5,000 Red River Authority, Texas, PCR, Refunding (Celanese Project), AMT, Series B, 6.70% due 11/01/2030 5,430 3,930 Sabine River Authority, Texas, PCR, Refunding (TXU Electric Company Project/TXU Energy Company LLC), Series C, 5.20% due 5/01/2028 3,954 ----------------------------------------------------------------------------------------------------------------------------------- Vermont - 0.2% 1,000 Vermont Educational and Health Buildings Financing Agency, Developmental and Mental Health Revenue Bonds (Howard Center for Human Services), Series A, 6.375% due 6/15/2022 1,052 ----------------------------------------------------------------------------------------------------------------------------------- Virginia - 0.6% 1,425 Chesterfield County, Virginia, IDA, PCR (Virginia Electric and Power Company), Series A, 5.875% due 6/01/2017 1,519 2,250 Fairfax County, Virginia, EDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Goodwin House, Inc.), 5.125% due 10/01/2042 2,274 ----------------------------------------------------------------------------------------------------------------------------------- Washington - 4.6% 3 Energy Northwest, Washington, Electric Revenue Refunding Bonds, DRIVERS, Series 255, 7.811% due 7/01/2018 (h)(m) 3 2,370 Seattle, Washington, Housing Authority Revenue Bonds (Replacement Housing Project), 6.125% due 12/01/2032 2,426 407 Washington State, GO, Trust Receipts, Class R, Series 6, 7.84% due 1/01/2014 (i)(m) 450 7,800 Washington State Housing Financing Commission, S/F Program Revenue Bonds, AMT, Series 2A, 4.70% due 12/01/2038 (d)(k) 7,488 14,320 Washington State Public Power Supply System, Revenue Refunding Bonds (Nuclear Project Number 1), Series B, 7.125% due 7/01/2016 17,577 ----------------------------------------------------------------------------------------------------------------------------------- Wisconsin - 1.7% 1,765 Milwaukee, Wisconsin, Revenue Bonds (Air Cargo), AMT, 6.50% due 1/01/2025 1,893 5,000 Wisconsin State Health and Educational Facilities Authority, Mortgage Revenue Bonds (Hudson Memorial Hospital), 5.70% due 1/15/2029 (j) 5,297 3,040 Wisconsin State Health and Educational Facilities Authority Revenue Bonds (SynergyHealth Inc.), 6% due 11/15/2032 3,281 ----------------------------------------------------------------------------------------------------------------------------------- BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- U.S. Virgin $ 8,000 Virgin Islands Government Refinery Facilities, Revenue Refunding Bonds (Hovensa Coker Islands - 1.5% Project), AMT, 6.50% due 7/01/2021 $ 8,960 ----------------------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds (Cost - $778,208) - 136.6% 822,719 ----------------------------------------------------------------------------------------------------------------------------------- Municipal Bonds Held in Trust (r) ----------------------------------------------------------------------------------------------------------------------------------- Illinois - 7.5% 14,000 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A, 5.75% due 1/01/2020 (c) 14,889 17,080 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 6% due 1/01/2027 (c) 18,966 2,975 Kane and De Kalb Counties, Illinois, Community Unity School District Number 302, GO, 5.75% due 2/01/2018 (f) 3,288 2,710 Kane and De Kalb Counties, Illinois, Community Unity School District Number 302, GO, 5.75% due 2/01/2019 (f) 2,995 4,780 Kane and De Kalb Counties, Illinois, Community Unity School District Number 302, GO, 5.75% due 2/01/2021 (f) 5,283 ----------------------------------------------------------------------------------------------------------------------------------- Massachusetts - 3.4% 20,000 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5% due 8/15/2030 (i) 20,930 ----------------------------------------------------------------------------------------------------------------------------------- New York - 7.2% 13,500 New York City, New York, City Transitional Finance Authority Revenue Bonds, Future Tax Secured, Series B, 6.25% due 11/15/2018 14,541 26,750 New York State Dormitory Authority, State University Educational Facilities Revenue Refunding Bonds, Series 1989, 6% due 5/15/2010 (a)(c) 28,627 ----------------------------------------------------------------------------------------------------------------------------------- Oregon - 1.2% 6,610 Portland, Oregon, Sewer System Revenue Bonds, Series A, 5.75% due 8/01/2010 (a)(f) 6,989 ----------------------------------------------------------------------------------------------------------------------------------- Texas - 6.3% 20,970 Harris County, Texas, Health Facilities Development Corporation, Revenue Refunding Bonds (School Health Care System), Series B24,680% due 7/01/2027 (e) 24,680 12,500 San Antonio, Texas, Electric and Gas Revenue Bonds, Series A, 5.75% due 2/01/2010 (a) 13,102 ----------------------------------------------------------------------------------------------------------------------------------- Washington - 8.7% 11,660 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Columbia Generating Station), Series A, 5.75% due 7/01/2018 (c) 12,601 7,015 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Columbia Generating Station), Series B, 6% due 7/01/2018 (h) 7,661 14,700 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Project Number 1), Series B, 6% due 7/01/2017 (c) 16,029 15,385 Washington State, Various Purpose, GO, Series B, 6% due 1/01/2010 (a)(i) 16,195 ----------------------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost - $199,204) - 34.3% 206,776 ----------------------------------------------------------------------------------------------------------------------------------- BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) Shares Held Short-Term Securities Value ----------------------------------------------------------------------------------------------------------------------------------- 8,700 Merrill Lynch Institutional Tax-Exempt Fund, 3.60% (p)(q) $ 8,700 ----------------------------------------------------------------------------------------------------------------------------------- Total Short-Term Securities (Cost - $8,700) - 1.4% 8,700 ----------------------------------------------------------------------------------------------------------------------------------- Total Investments (Cost - $986,112*) - 172.3% 1,038,195 Liabilities in Excess of Other Assets - (0.4%) (2,636) Liability for Trust Certificates, Including Interest Expense Payable - (16.4%) (98,708) Preferred Stock, at Redemption Value - (55.5%) (334,318) ---------- ---------- Net Assets Applicable to Common Stock - 100.0% $ 602,533 ========== * The cost and unrealized appreciation (depreciation) of investments as of May 31, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost $ 892,469 ========= Gross unrealized appreciation $ 50,603 Gross unrealized depreciation (2,485) --------- Net unrealized appreciation $ 48,118 ========= (a) Prerefunded. (b) FNMA Collateralized. (c) MBIA Insured. (d) FNMA/GNMA Collateralized. (e) Escrowed to maturity. (f) FGIC Insured. (g) Radian Insured. (h) AMBAC Insured. (i) FSA Insured. (j) FHA Insured. (k) FHLMC Collateralized. (l) 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. (m) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (n) XL Capital Insured. (o) GNMA Collateralized. BlackRock MuniVest Fund, Inc. Schedule of Investments as of May 31, 2007 (Unaudited) (in Thousands) (p) 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: -------------------------------------------------------------------------- Affiliate Net Dividend Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund 8,278 $259 -------------------------------------------------------------------------- (q) Represents the current yield as of May 31, 2007. (r) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. o Forward interest rate swaps outstanding as of May 31, 2007 were as follows: -------------------------------------------------------------------------- Notional Unrealized Amount Appreciation -------------------------------------------------------------------------- Pay a fixed rate of 3.595% and receive a floating rate based on 1-Week Bond Market Association Rate Broker, JPMorgan Chase Expires June 2017 $ 17,250 $ 307 Pay a fixed rate of 3.7575% and receive a floating rate based on 1-Week Bond Market Association Rate Broker, JPMorgan Chase Expires July 2017 $ 25,000 141 Pay a fixed rate of 3.769% and receive a floating rate based on 1-Week Bond Market Association Rate Broker, Goldman Sachs, Inc. Expires August 2017 $ 18,000 92 Pay a fixed rate of 3.662% and receive a floating rate based on 1-Week Bond Market Association Rate Broker, JPMorgan Chase Expires August 2017 $ 25,000 331 -------------------------------------------------------------------------- Total $ 871 ========= 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. BlackRock MuniVest Fund, Inc. By: /s/ Robert C. Doll, Jr. ----------------------------- Robert C. Doll, Jr. Chief Executive Officer BlackRock MuniVest Fund, Inc. Date: July 24, 2007 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 BlackRock MuniVest Fund, Inc. Date: July 24, 2007 By: /s/ Donald C. Burke ----------------------------- Donald C. Burke Chief Financial Officer BlackRock MuniVest Fund, Inc. Date: July 24, 2007