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 811-07642 Name of Fund: BlackRock MuniAssets Fund, Inc. (MUA) Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809 Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock MuniAssets 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: (800) 882-0052, Option 4 Date of fiscal year end: 05/31/2009 Date of reporting period: 06/01/2008 - 08/31/2008 Item 1 - Schedule of Investments BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- Alabama - 0.5% Tuscaloosa, Alabama, Special Care Facilities Financing Authority, Residential Care Facility Revenue Bonds (Capstone Village, Inc. Project), Series A, 5.875%, 8/01/36 $ 1,820 $ 1,390,516 ----------------------------------------------------------------------------------------------------------------------------------- Alaska - 0.3% Alaska Industrial Development and Export Authority Revenue Bonds (Williams Lynxs Alaska Cargoport), AMT, 7.80%, 5/01/14 770 777,746 ----------------------------------------------------------------------------------------------------------------------------------- Arizona - 7.7% Coconino County, Arizona, Pollution Control Corporation Revenue Refunding Bonds (Tucson Electric Power - Navajo), AMT, Series A, 7.125%, 10/01/32 3,000 3,003,300 Coconino County, Arizona, Pollution Control Corporation Revenue Refunding Bonds (Tucson Electric Power - Navajo), Series B, 7%, 10/01/32 2,500 2,509,875 Maricopa County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project 1), Series A, 6.625%, 7/01/20 1,625 1,457,528 Maricopa County, Arizona, IDA, M/F Housing Revenue Bonds (Sun King Apartments Project), Series A, 6.75%, 5/01/31 1,615 1,538,465 Phoenix, Arizona, IDA, Airport Facility, Revenue Refunding Bonds (America West Airlines Inc. Project), AMT, 6.30%, 4/01/23 4,800 3,635,616 Pima County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project), Series E, 7.25%, 7/01/31 1,390 1,424,514 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project), Series O, 5.25%, 7/01/31 500 417,805 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project II), Series A, 6.75%, 7/01/11 (a) 415 462,181 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project II), Series A, 6.75%, 7/01/31 675 677,936 Salt Verde Financial Corporation, Arizona, Senior Gas Revenue Bonds, 5%, 12/01/32 2,840 2,405,622 Salt Verde Financial Corporation, Arizona, Senior Gas Revenue Bonds, 5%, 12/01/37 1,850 1,534,520 Show Low, Arizona, Improvement District Number 5, Special Assessment Bonds, 6.375%, 1/01/15 1,000 1,004,750 ------------- 20,072,112 ----------------------------------------------------------------------------------------------------------------------------------- California - 6.0% California State, Various Purpose, GO, 5.25%, 11/01/25 1,900 1,941,230 California State, Various Purpose, GO, 5.50%, 11/01/33 1,300 1,324,466 Fontana, California, Special Tax, Refunding (Community Facilities District Number 22 - Sierra), 6%, 9/01/34 1,320 1,321,967 Los Angeles County, California, Metropolitan Transportation Authority, Sales Tax Revenue Refunding Bonds, Proposition C, VRDN, Second Senior Series A, 7.50%, 7/01/20 (b)(c) 5,000 5,000,000 Portfolio Abbreviations To simplify the listings of 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) EDA Economic Development Authority EDR Economic Development Revenue Bonds GO General Obligation Bonds HDA Housing Development Authority HFA Housing Finance Agency IDA Industrial Development Authority IDR Industrial Development Revenue Bonds M/F Multi-Family PCR Pollution Control Revenue Bonds VRDN Variable Rate Demand Notes BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- San Jose, California, Airport Revenue Refunding Bonds, AMT, Series A, 5.50%, 3/01/32 (d) $ 4,290 $ 4,141,952 Southern California Public Power Authority, Natural Gas Project Number 1 Revenue Bonds, Series A, 5%, 11/01/29 2,085 1,970,325 ------------- 15,699,940 ----------------------------------------------------------------------------------------------------------------------------------- Colorado - 4.6% Colorado Health Facilities Authority, Revenue Refunding Bonds (Christian Living Communities Project), Series A, 5.75%, 1/01/26 650 596,830 Denver, Colorado, City and County Airport Revenue Bonds, AMT, Series D, 7.75%, 11/15/13 (d) 1,805 1,957,667 Elk Valley, Colorado, Public Improvement Revenue Bonds (Public Improvement Fee), Series A, 7.10%, 9/01/14 1,410 1,462,861 Elk Valley, Colorado, Public Improvement Revenue Bonds (Public Improvement Fee), Series A, 7.30%, 9/01/22 2,095 2,128,017 Elk Valley, Colorado, Public Improvement Revenue Bonds (Public Improvement Fee), Series B, 7.45%, 9/01/31 260 260,179 North Range Metropolitan District Number 1, Colorado, GO, 7.25%, 12/15/11 (a) 1,760 1,990,261 Plaza Metropolitan District Number 1, Colorado, Tax Allocation Revenue Bonds (Public Improvement Fees), 8%, 12/01/25 2,850 2,991,018 Plaza Metropolitan District Number 1, Colorado, Tax Allocation Revenue Bonds (Public Improvement Fees), 8.125%, 12/01/25 525 526,528 ------------- 11,913,361 ----------------------------------------------------------------------------------------------------------------------------------- Connecticut - 2.7% Connecticut State Development Authority, Airport Facility Revenue Bonds (Learjet Inc. Project), AMT, 7.95%, 4/01/26 680 722,228 Connecticut State Development Authority, IDR (AFCO Cargo BDL-LLC Project), AMT, 8%, 4/01/30 3,490 3,522,248 Connecticut State, HFA, Housing Mortgage Finance Program Revenue Bonds, AMT, Sub-Series A-2, 5.15%, 5/15/38 2,250 1,985,512 Mashantucket Western Pequot Tribe, Connecticut, Revenue Refunding Bonds, Sub-Series A, 5.50%, 9/01/36 885 744,701 ------------- 6,974,689 ----------------------------------------------------------------------------------------------------------------------------------- Florida - 11.4% Capital Projects Finance Authority, Florida, Continuing Care Retirement Revenue Bonds (Glenridge on Palmer Ranch), Series A, 8%, 6/01/12 (a) 1,130 1,354,768 Greater Orlando Aviation Authority, Florida, Airport Facilities Revenue Bonds (JetBlue Airways Corp.), AMT, 6.375%, 11/15/26 1,180 847,759 Halifax Hospital Medical Center, Florida, Hospital Revenue Refunding Bonds, Series A, 5%, 6/01/38 1,160 1,001,289 Harbor Bay, Florida, Community Development District, Capital Improvement Special Assessment Revenue Bonds, Series A, 7%, 5/01/33 490 504,259 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25%, 11/15/36 1,195 1,150,677 Hillsborough County, Florida, IDA, Exempt Facilities Revenue Bonds (National Gypsum Company), AMT, Series A, 7.125%, 4/01/30 2,000 1,895,740 BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- Hillsborough County, Florida, IDA, Hospital Revenue Bonds (Tampa General Hospital Project), 5%, 10/01/36 $ 4,300 $ 3,809,456 Jacksonville, Florida, Economic Development Commission, Health Care Facilities, Revenue Refunding Bonds (Florida Proton Therapy Institute), Series A, 6%, 9/01/17 920 916,210 Jacksonville, Florida, Economic Development Commission, IDR (Gerdau Ameristeel US, Inc.), AMT, 5.30%, 5/01/37 1,300 1,020,110 Lee County, Florida, IDA, IDR (Lee Charter Foundation), Series A, 5.375%, 6/15/37 2,620 2,108,995 Midtown Miami, Florida, Community Development District, Special Assessment Revenue Bonds, Series A, 6.25%, 5/01/37 3,255 2,939,591 Orlando, Florida, Urban Community Development District, Capital Improvement Special Assessment Bonds, Series A, 6.95%, 5/01/11 (a) 2,245 2,483,644 Santa Rosa Bay Bridge Authority, Florida, Revenue Bonds, 6.25%, 7/01/28 3,040 2,675,230 Sarasota County, Florida, Health Facilities Authority, Retirement Facility Revenue Refunding Bonds (Village on the Isle Project), 5.50%, 1/01/27 860 768,548 Sarasota County, Florida, Health Facilities Authority, Retirement Facility Revenue Refunding Bonds (Village on the Isle Project), 5.50%, 1/01/32 795 680,623 Sumter Landing Community Development District, Florida, Recreational Revenue Bonds, Sub-Series B, 5.70%, 10/01/38 2,425 1,979,746 Tolomato Community Development District, Florida, Special Assessment Bonds, 6.65%, 5/01/40 2,680 2,593,892 Waterchase, Florida, Community Development District, Capital Improvement Revenue Bonds, Series A, 6.70%, 5/01/11 (a) 895 984,428 ------------- 29,714,965 ----------------------------------------------------------------------------------------------------------------------------------- Georgia - 3.7% Atlanta, Georgia, Tax Allocation Bonds (Atlantic Station Project), 7.90%, 12/01/11 (a) 3,000 3,532,950 Atlanta, Georgia, Tax Allocation Bonds (Princeton Lakes Project), 5.50%, 1/01/31 740 652,569 Clayton County, Georgia, Tax Allocation Bonds (Ellenwood Project), 7.50%, 7/01/33 2,375 2,230,362 Main Street Natural Gas, Inc., Georgia, Gas Project Revenue Bonds, Series A, 6.375%, 7/15/38 940 853,708 Rockdale County, Georgia, Development Authority Revenue Bonds (Visy Paper Project), AMT, Series A, 6.125%, 1/01/34 2,435 2,307,601 ------------- 9,577,190 ----------------------------------------------------------------------------------------------------------------------------------- Idaho - 0.4% Idaho Health Facilities Authority, Revenue Refunding Bonds (Valley Vista Care Corporation), Series A, 7.75%, 11/15/16 1,000 1,083,370 ----------------------------------------------------------------------------------------------------------------------------------- Illinois - 4.3% Chicago, Illinois, O'Hare International Airport, Special Facility Revenue Refunding Bonds (American Airlines Inc. Project), 5.50%, 12/01/30 4,140 2,411,633 BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- Illinois State Finance Authority Revenue Bonds (Clare At Water Tower Project), Series A, 6.125%, 5/15/38 $ 2,950 $ 2,549,242 Illinois State Finance Authority Revenue Bonds (Landing At Plymouth Place Project), Series A, 6%, 5/15/37 600 523,446 Illinois State Finance Authority Revenue Bonds (Monarch Landing, Inc. Project), Series A, 7%, 12/01/37 820 791,267 Illinois State Finance Authority Revenue Bonds (Primary Health Care Centers Program), 6.60%, 7/01/24 685 642,276 Lincolnshire, Illinois, Special Service Area Number 1, Special Tax Bonds (Sedgebrook Project), 6.25%, 3/01/34 1,070 1,010,262 Lombard, Illinois, Public Facilities Corporation, First Tier Revenue Bonds (Conference Center and Hotel), Series A-1, 7.125%, 1/01/36 2,600 2,622,490 Village of Wheeling, Illinois, Revenue Bonds (North Milwaukee/Lake- Cook Tax Increment Financing (TIF) Redevelopment Project), 6%, 1/01/25 825 746,089 ------------- 11,296,705 ----------------------------------------------------------------------------------------------------------------------------------- Indiana - 0.9% Vanderburgh County, Indiana, Redevelopment Commission, Redevelopment District Tax Allocation Bonds, 5.25%, 2/01/31 1,200 1,130,628 Vigo County, Indiana, Hospital Authority Revenue Bonds (Union Hospital, Inc.), 5.70%, 9/01/37 615 522,990 Vigo County, Indiana, Hospital Authority Revenue Bonds (Union Hospital, Inc.), 5.75%, 9/01/42 765 640,695 ------------- 2,294,313 ----------------------------------------------------------------------------------------------------------------------------------- Iowa - 1.0% Iowa Finance Authority, Health Care Facilities, Revenue Refunding Bonds (Care Initiatives Project), 9.25%, 7/01/11 (a) 2,165 2,596,441 ----------------------------------------------------------------------------------------------------------------------------------- Kansas - 0.4% Wyandotte County, Kansas, Kansas City Unified Government Revenue Refunding Bonds (General Motors Corporation Project), 6%, 6/01/25 1,770 1,050,460 ----------------------------------------------------------------------------------------------------------------------------------- Kentucky - 1.1% Kenton County, Kentucky, Airport Board, Special Facilities Revenue Bonds (Mesaba Aviation Inc. Project), AMT, Series A, 6.70%, 7/01/09 (a) 2,850 3,000,993 ----------------------------------------------------------------------------------------------------------------------------------- Louisiana - 2.8% Louisiana Local Government Environmental Facilities and Community Development Authority Revenue Bonds (Westlake Chemical Corporation), 6.75%, 11/01/32 3,000 2,936,700 Louisiana Public Facilities Authority, Hospital Revenue Bonds (Franciscan Missionaries of Our Lady Health System, Inc.), Series A, 5.25%, 8/15/36 1,870 1,788,187 Saint John Baptist Parish, Louisiana, Revenue Bonds (Marathon Oil Corporation), Series A, 5.125%, 6/01/37 2,950 2,533,608 ------------- 7,258,495 ----------------------------------------------------------------------------------------------------------------------------------- Maryland - 1.8% Maryland State Economic Development Corporation Revenue Refunding Bonds (Baltimore Association for Retarded Citizens-Health and Mental Hygiene Program), Series A, 7.75%, 3/01/25 1,815 1,905,387 Maryland State Energy Financing Administration, Limited Obligation Revenue Bonds (Cogeneration-AES Warrior Run), AMT, 7.40%, 9/01/19 1,500 1,456,845 BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- Maryland State Health and Higher Educational Facilities Authority Revenue Bonds (King Farm Presbyterian Community), Series A, 5.30%, 1/01/37 $ 1,250 $ 988,225 Maryland State Health and Higher Educational Facilities Authority Revenue Bonds (Washington Christian Academy), 5.50%, 7/01/38 590 476,018 ------------- 4,826,475 ----------------------------------------------------------------------------------------------------------------------------------- Massachusetts - 1.1% Massachusetts State Health and Educational Facilities Authority Revenue Bonds (Jordan Hospital), Series E, 6.75%, 10/01/33 1,150 1,136,890 Massachusetts State Health and Educational Facilities Authority, Revenue Refunding Bonds (Bay Cove Human Services Issue), Series A, 5.90%, 4/01/28 1,945 1,811,320 ------------- 2,948,210 ----------------------------------------------------------------------------------------------------------------------------------- Michigan - 1.5% Advanced Technology Academy, Michigan, Revenue Bonds, 6%, 11/01/37 900 860,607 Macomb County, Michigan, Hospital Finance Authority, Hospital Revenue Bonds (Mount Clemens General Hospital), Series B, 5.875%, 11/15/13 (a) 1,635 1,840,797 Monroe County, Michigan, Hospital Financing Authority, Hospital Revenue Refunding Bonds (Mercy Memorial Hospital Corporation), 5.50%, 6/01/35 1,740 1,327,533 ------------- 4,028,937 ----------------------------------------------------------------------------------------------------------------------------------- Missouri - 0.4% Kansas City, Missouri, IDA, First Mortgage Health Facilities Revenue Bonds (Bishop Spencer Place), Series A, 6.50%, 1/01/35 1,000 945,840 ----------------------------------------------------------------------------------------------------------------------------------- Nevada - 0.7% Clark County, Nevada, IDR (Nevada Power Company Project), AMT, Series A, 5.60%, 10/01/30 1,380 1,173,869 Clark County, Nevada, Improvement District Number 142, Special Assessment Bonds, 6.375%, 8/01/23 635 596,055 ------------- 1,769,924 ----------------------------------------------------------------------------------------------------------------------------------- New Hampshire - 0.4% New Hampshire Health and Education Facilities Authority, Hospital Revenue Bonds (Catholic Medical Center), 5%, 7/01/36 1,165 1,018,117 ----------------------------------------------------------------------------------------------------------------------------------- New Jersey - 10.6% Camden County, New Jersey, Pollution Control Financing Authority, Solid Waste Resource Recovery, Revenue Refunding Bonds, AMT, Series A, 7.50%, 12/01/10 9,000 9,022,500 Camden County, New Jersey, Pollution Control Financing Authority, Solid Waste Resource Recovery, Revenue Refunding Bonds, AMT, Series B, 7.50%, 12/01/09 345 346,018 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50%, 6/15/24 3,065 2,912,670 New Jersey EDA, IDR, Refunding (Newark Airport Marriott Hotel), 7%, 10/01/14 2,500 2,511,000 New Jersey EDA, Retirement Community Revenue Bonds (Cedar Crest Village Inc. Facility), Series A, 7.25%, 11/15/11 (a) 1,665 1,914,767 New Jersey EDA, Special Facility Revenue Bonds (Continental Airlines Inc. Project), AMT, 6.25%, 9/15/19 2,000 1,631,400 New Jersey EDA, Special Facility Revenue Bonds (Continental Airlines Inc. Project), AMT, 6.25%, 9/15/29 3,330 2,484,380 New Jersey EDA, Special Facility Revenue Bonds (Continental Airlines Inc. Project), AMT, 9%, 6/01/33 1,250 1,249,688 BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- New Jersey Health Care Facilities Financing Authority Revenue Bonds (Pascack Valley Hospital Association), 6.625%, 7/01/36 $ 2,000 $ 1,387,600 New Jersey Health Care Facilities Financing Authority, Revenue Refunding Bonds (Saint Joseph's Healthcare System), 6.625%, 7/01/38 2,410 2,296,296 New Jersey State Transportation Trust Fund Authority, Transportation System Revenue Bonds, Series C, 5.05%, 12/15/35 (d)(e) 3,450 798,089 Tobacco Settlement Financing Corporation of New Jersey, Asset- Backed Revenue Refunding Bonds, Series 1A, 5%, 6/01/41 1,545 1,100,025 ------------- 27,654,433 ----------------------------------------------------------------------------------------------------------------------------------- New Mexico - 1.0% Farmington, New Mexico, PCR, Refunding (Tucson Electric Power Company - San Juan Project), Series A, 6.95%, 10/01/20 2,500 2,511,050 ----------------------------------------------------------------------------------------------------------------------------------- New York - 4.1% Dutchess County, New York, IDA, Civic Facility Revenue Refunding Bonds (Saint Francis Hospital), Series A, 7.50%, 3/01/29 1,400 1,488,634 New York City, New York, City IDA, Civic Facility Revenue Bonds, Series C, 6.80%, 6/01/28 510 528,253 New York City, New York, City IDA, Civic Facility Revenue Bonds (Special Needs Facilities Pooled Program), Series C-1, 6.625%, 7/01/29 1,515 1,435,569 New York City, New York, City IDA, Special Facility Revenue Bonds (British Airways Plc Project), AMT, 7.625%, 12/01/32 2,400 2,064,096 New York Liberty Development Corporation Revenue Bonds (National Sports Museum Project), Series A, 6.125%, 2/15/19 870 769,889 New York State Dormitory Authority, Non-State Supported Debt, Revenue Refunding Bonds (Mount Sinai-NYU Medical Center Health System), Series C, 5.50%, 7/01/26 1,470 1,463,267 New York State Dormitory Authority, Non-State Supported Debt, Revenue Refunding Bonds (New York University Hospital Center), Series A, 5%, 7/01/20 2,960 2,824,817 Westchester County, New York, IDA, Continuing Care Retirement, Mortgage Revenue Bonds (Kendal on Hudson Project), Series A, 6.50%, 1/01/13 (a) 100 115,589 ------------- 10,690,114 ----------------------------------------------------------------------------------------------------------------------------------- North Carolina - 2.5% North Carolina Medical Care Commission, Health Care Facilities, First Mortgage Revenue Refunding Bonds (Deerfield Episcopal Project), Series A, 6.125%, 11/01/38 2,335 2,349,687 North Carolina Medical Care Commission, Retirement Facilities, First Mortgage Revenue Bonds (Givens Estates Project), Series A, 6.50%, 7/01/13 (a) 1,500 1,750,695 North Carolina State Educational Assistance Authority, Revenue Refunding Bonds (Guaranteed Student Loan), VRDN, AMT, Series A-1, 10%, 9/01/35 (b)(d) 2,390 2,390,000 ------------- 6,490,382 ----------------------------------------------------------------------------------------------------------------------------------- Ohio - 1.3% Buckeye Tobacco Settlement Financing Authority, Ohio, Tobacco Settlement Asset-Backed Bonds, Series A-2, 6.50%, 6/01/47 3,935 3,499,828 ----------------------------------------------------------------------------------------------------------------------------------- Pennsylvania - 8.5% Allegheny County, Pennsylvania, Hospital Development Authority, Revenue Refunding Bonds (West Penn Allegheny Health System), Series A, 5.375%, 11/15/40 3,015 2,104,379 BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- Bucks County, Pennsylvania, IDA, Retirement Community Revenue Bonds (Ann's Choice Inc.), Series A, 6.125%, 1/01/25 $ 200 $ 197,988 Bucks County, Pennsylvania, IDA, Retirement Community Revenue Bonds (Ann's Choice Inc.), Series A, 6.25%, 1/01/35 1,550 1,500,322 Harrisburg, Pennsylvania, Authority, University Revenue Bonds (Harrisburg University of Science), Series B, 6%, 9/01/36 900 836,856 Lancaster County, Pennsylvania, Hospital Authority Revenue Bonds (Brethren Village Project), Series A, 6.25%, 7/01/26 685 672,307 Lancaster County, Pennsylvania, Hospital Authority Revenue Bonds (Brethren Village Project), Series A, 6.50%, 7/01/40 590 584,448 Montgomery County, Pennsylvania, IDA, Revenue Bonds (Whitemarsh Continuing Care Project), 6.125%, 2/01/28 2,330 2,107,602 Pennsylvania Economic Development Financing Authority, Exempt Facilities Revenue Bonds (National Gypsum Company), AMT, Series A, 6.25%, 11/01/27 3,250 2,795,813 Pennsylvania Economic Development Financing Authority, Exempt Facilities Revenue Bonds (Reliant Energy), AMT, Series B, 6.75%, 12/01/36 2,810 2,814,889 Philadelphia, Pennsylvania, Authority for IDR (Air Cargo), AMT, Series A, 7.50%, 1/01/25 2,270 2,280,873 Philadelphia, Pennsylvania, Authority for IDR, Commercial Development, 7.75%, 12/01/17 6,440 6,444,894 ------------- 22,340,371 ----------------------------------------------------------------------------------------------------------------------------------- Rhode Island - 1.0% Central Falls, Rhode Island, Detention Facility Corporation, Revenue Refunding Bonds, 7.25%, 7/15/35 2,495 2,505,155 ----------------------------------------------------------------------------------------------------------------------------------- South Carolina - 1.5% Connector 2000 Association, Inc., South Carolina, Toll Road and Capital Appreciation Revenue Bonds, Senior-Series B, 6.50%, 1/01/09 (e) 1,500 1,446,240 Connector 2000 Association, Inc., South Carolina, Toll Road and Capital Appreciation Revenue Bonds, Senior-Series B, 7.969%, 1/01/14 (e) 1,485 776,521 South Carolina Jobs, EDA, EDR (Westminster Presbyterian Center), 7.75%, 11/15/10 (a) 1,500 1,703,175 ------------- 3,925,936 ----------------------------------------------------------------------------------------------------------------------------------- Tennessee - 1.4% Knox County, Tennessee, Health, Educational and Housing Facilities Board, Hospital Facilities Revenue Refunding Bonds (Covenant Health), Series A, 5.06%, 1/01/40 (e) 6,785 903,016 Shelby County, Tennessee, Health, Educational and Housing Facilities Board Revenue Bonds (Germantown Village), 6.25%, 12/01/34 355 285,239 Shelby County, Tennessee, Health, Educational and Housing Facilities Board Revenue Bonds (Germantown Village), Series A, 7.25%, 12/01/34 2,500 2,453,325 ------------- 3,641,580 ----------------------------------------------------------------------------------------------------------------------------------- Texas - 3.0% Brazos River Authority, Texas, PCR, Refunding (TXU Energy Company LLC Project), AMT, Series A, 7.70%, 4/01/33 2,550 2,362,830 Houston, Texas, Health Facilities Development Corporation, Retirement Facility Revenue Bonds (Buckingham Senior Living Community), Series A, 7.125%, 2/15/14 (a) 1,400 1,694,322 BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) (Percentages shown are based on Net Assets) Par State Municipal Bonds (000) Value ----------------------------------------------------------------------------------------------------------------------------------- North Texas Tollway Authority, System Revenue Refunding Bonds, Second Tier, Series F, 6.125%, 1/01/31 $ 3,675 $ 3,721,158 ------------- 7,778,310 ----------------------------------------------------------------------------------------------------------------------------------- Utah - 0.6% Carbon County, Utah, Solid Waste Disposal, Revenue Refunding Bonds (Laidlaw Environmental), AMT, Series A, 7.45%, 7/01/17 1,660 1,670,176 ----------------------------------------------------------------------------------------------------------------------------------- Virginia - 1.5% Dulles Town Center, Virginia, Community Development Authority, Special Assessment Tax (Dulles Town Center Project), 6.25%, 3/01/26 1,455 1,447,347 Fairfax County, Virginia, EDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Goodwin House, Inc.), 5.125%, 10/01/37 750 662,040 Fairfax County, Virginia, EDA, Residential Care Facilities, Mortgage Revenue Refunding Bonds (Goodwin House, Inc.), 5.125%, 10/01/42 450 389,614 Lexington, Virginia, IDA, Residential Care Facility, Mortgage Revenue Refunding Bonds (Kendal at Lexington), Series A, 5.375%, 1/01/28 540 465,107 Tobacco Settlement Financing Corporation of Virginia, Revenue Refunding Bonds, Senior Series B-1, 5%, 6/01/47 1,320 936,131 ------------- 3,900,239 ----------------------------------------------------------------------------------------------------------------------------------- Washington - 0.6% Washington State Housing Financing Commission, Nonprofit Revenue Bonds (Skyline at First Hill Project), Series A, 5.625%, 1/01/38 1,750 1,526,735 ----------------------------------------------------------------------------------------------------------------------------------- Wisconsin - 0.7% Wisconsin State Health and Educational Facilities Authority Revenue Bonds (New Castle Place Project), Series A, 7%, 12/01/31 1,855 1,858,766 ----------------------------------------------------------------------------------------------------------------------------------- Wyoming - 1.1% Wyoming Municipal Power Agency, Power Supply Revenue Bonds, Series A, 5.375%, 1/01/42 3,030 2,936,222 ----------------------------------------------------------------------------------------------------------------------------------- U.S. Virgin Islands - 1.1% Virgin Islands Government Refinery Facilities, Revenue Refunding Bonds (Hovensa Coker Project), AMT, 6.50%, 7/01/21 3,000 3,006,390 ----------------------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds - 94.2% 246,174,486 ----------------------------------------------------------------------------------------------------------------------------------- Municipal Bonds Transferred to Tender Option Bond Trusts (f) ----------------------------------------------------------------------------------------------------------------------------------- Florida - 3.2% Miami-Dade County, Florida, Aviation Revenue Bonds (Miami International Airport), AMT, Series A, 5.25%, 10/01/33 (g) 8,870 8,408,139 ----------------------------------------------------------------------------------------------------------------------------------- Virginia - 3.3% Virginia State, HDA, Commonwealth Mortgage Revenue Bonds, Series H, Sub-Series H-1, 5.375%, 7/01/36 (c) 8,690 8,614,918 ----------------------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds Transferred to Tender Option Bond Trusts - 6.5% 17,023,057 ----------------------------------------------------------------------------------------------------------------------------------- Total Long-Term Investments (Cost - $273,452,548) - 100.7% 263,197,543 ----------------------------------------------------------------------------------------------------------------------------------- Short-Term Securities Shares ----------------------------------------------------------------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund, 1.84% (h)(i) 3,300,000 3,300,000 ----------------------------------------------------------------------------------------------------------------------------------- Total Short-Term Securities (Cost - $3,300,000) - 1.3% 3,300,000 ----------------------------------------------------------------------------------------------------------------------------------- Total Investments (Cost - $276,752,548*) - 102.0% 266,497,543 Other Assets Less Liabilities - 1.4% 3,531,027 Liability for Trust Certificates, Including Interest Expense and Fees Payable - (3.4)% (8,809,262) ------------- Net Assets - 100.0% $ 261,219,308 ============= BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) * The cost and unrealized appreciation (depreciation) of investments as of August 31, 2008, as computed for federal income tax purposes, were as follows: Aggregate cost $ 268,031,634 ============= Gross unrealized appreciation $ 5,892,694 Gross unrealized depreciation (16,206,785) ------------- Net unrealized depreciation $ (10,314,091) ============= (a) U.S. government securities, held in escrow, are used to pay interest on this security as well as to retire the bond in full at the date indicated, typically at a premium to par. (b) Variable rate security. Rate shown is as of report date. Maturity shown is the final maturity date. (c) MBIA Insured. (d) AMBAC Insured. (e) Represents a zero coupon bond. Rate shown reflects the effective yield at the time of purchase. (f) Securities represents bonds transferred to a tender option bond trust in exchange for which the Fund acquired the residual interest certificates. These securities serve as collateral in a financing transaction. (g) Assured Guaranty Insured. (h) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Affiliate Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund 99,559 $24,146 -------------------------------------------------------------------------- (i) Represents the current yield as of report date. BlackRock MuniAssets Fund, Inc. Schedule of Investments August 31, 2008 (Unaudited) o Effective June 1, 2008, the Fund adopted Financial Accounting Standards Board Statement of Financial Accounting Standards No. 157, "Fair Value Measurements" ("FAS 157"). FAS 157 clarifies the definition of fair value, establishes a framework for measuring fair values and requires additional disclosures about the use of fair value measurements. Various inputs are used in determining the fair value of investments, which are as follows: o Level 1 - price quotations in active markets/exchanges for identical securities o Level 2 - other observable inputs (including, but not limited to: quoted prices for similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks, and default rates) or other market-corroborated inputs) o Level 3 - unobservable inputs based on the best information available in the circumstance, to the extent observable inputs are not available (including the Fund's own assumption used in determining the fair value of investments) The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. For information about the Fund's policy regarding valuation of investments and other significant accounting policies, please refer to the Fund's most recent financial statements as contained in its annual report. The following table summarizes the inputs used as of August 31, 2008 in determining the fair valuation of the Fund's investments: -------------------------------------------------------------------- Valuation Investments in Inputs Securities -------------------------------------------------------------------- Level 1 -- Level 2 $ 266,497,543 Level 3 -- -------------------------------------------------------------------- Total $ 266,497,543 ============= Item 2 - Controls and Procedures 2(a) - The registrant's principal executive and principal financial officers or persons performing similar functions have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act")) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 13a-15(b) under the Securities Exchange Act of 1934, as amended. 2(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 3 - Exhibits 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 MuniAssets Fund, Inc. By: /s/ Donald C. Burke -------------------------------- Donald C. Burke Chief Executive Officer of BlackRock MuniAssets Fund, Inc. Date: October 20, 2008 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/ Donald C. Burke -------------------------------- Donald C. Burke Chief Executive Officer (principal executive officer) of BlackRock MuniAssets Fund, Inc. Date: October 20, 2008 By: /s/ Neal J. Andrews -------------------------------- Neal J. Andrews Chief Financial Officer (principal financial officer) of BlackRock MuniAssets Fund, Inc. Date: October 20, 2008