UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-04802 Name of Fund: BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809 Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust, 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) 441-7762 Date of fiscal year end: 05/31/2008 Date of reporting period: 06/01/2007 - 05/31/2008 Item 1 - Report to Stockholders EQUITIES FIXED INCOME REAL ESTATE LIQUIDITY ALTERNATIVES BLACKROCK SOLUTIONS BlackRock Intermediate BLACKROCK Municipal Fund OF BLACKROCK MUNICIPAL SERIES TRUST ANNUAL REPORT | MAY 31, 2008 NOT FDIC INSURED MAY LOSE VALUE NO BANK GUARANTEE Table of Contents ================================================================================ Page - -------------------------------------------------------------------------------- A Letter to Shareholders ................................................. 3 Annual Report: Fund Summary ............................................................. 4 About Fund Performance ................................................... 6 Disclosure of Expenses ................................................... 6 Portfolio Summary ........................................................ 7 Financial Statements: Schedule of Investments .............................................. 8 Statement of Assets and Liabilities .................................. 11 Statements of Operations ............................................. 12 Statements of Changes in Net Assets .................................. 13 Financial Highlights ..................................................... 14 Notes to Financial Statements ............................................ 18 Report of Independent Registered Public Accounting Firm .................. 26 Important Tax Information (Unaudited) .................................... 26 Officers and Trustees .................................................... 27 Additional Information ................................................... 31 Mutual Fund Family ....................................................... 34 2 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 A Letter to Shareholders Dear Shareholder For much of the reporting period, investors grappled with the repercussions of the credit crisis that surfaced last summer, and with the effects of a weakening economy and surging energy and food prices. These factors were offset by the positive impact from robust export activity, strength in the non-financial corporate sector and monetary and fiscal stimuli. Amid the market turbulence, the Federal Reserve Board (the "Fed") initiated a series of moves to restore liquidity and bolster financial market stability. Since September 2007, the central bank slashed the target federal funds rate 325 basis points (3.25%), bringing the rate to 2.0% as of period-end. Also of significance were its other policy decisions, which included extending use of the discount window to broker-dealers and investment banks and backstopping the rescue of ill-fated Bear Stearns. Notably, on April 30, the Fed dropped previous references to downside growth risks and added more emphasis on inflationary pressures, indicating the central bankers have likely concluded the current cycle of monetary easing. Nevertheless, the Fed's response to the financial crisis helped to ease credit turmoil and investor anxiety. Since hitting a low point on March 17, following the collapse of Bear Stearns, stocks appreciated 10% (through May 30). Most international markets, which had outperformed U.S. stocks for some time, saw a reversal in that trend, as the troubled credit situation and downward pressures on growth fanned recession fears. In fixed income markets, Treasury securities rallied (yields fell as prices correspondingly rose), as a broad "flight-to-quality" theme persisted. The yield on 10-year Treasury issues, which touched 5.30% in June 2007 (its highest level in five years), fell to a low of 3.34% in March 2008 before rising to 4.06% by May 31 as investors grew more risk tolerant and shifted out of Treasury issues in favor of stocks and other high-quality fixed income sectors. Tax-exempt issues underperformed throughout most of the reporting period, pressured by problems among municipal bond insurers and the freeze in the market for auction rate securities. However, the final two months saw a firmer tone in the municipal market, as investors took advantage of unusually high yields. On the whole, results for the major benchmark indexes generally reflected heightened investor risk aversion: Total Returns as of May 31, 2008 6-month 12-month ========================================================================================================== U.S. equities (S&P 500 Index) (4.47%) (6.70%) - ---------------------------------------------------------------------------------------------------------- Small cap U.S. equities (Russell 2000 Index) (1.87) (10.53) - ---------------------------------------------------------------------------------------------------------- International equities (MSCI Europe, Australasia, Far East Index) (5.21) (2.53) - ---------------------------------------------------------------------------------------------------------- Fixed income (Lehman Brothers U.S. Aggregate Index) 1.49 6.89 - ---------------------------------------------------------------------------------------------------------- Tax-exempt fixed income (Lehman Brothers Municipal Bond Index) 1.44 3.87 - ---------------------------------------------------------------------------------------------------------- High yield bonds (Lehman Brothers U.S. Corporate High Yield 2% Issuer Capped Index) 1.81 (1.08) - ---------------------------------------------------------------------------------------------------------- Past performance is no guarantee of future results. Index performance shown for illustrative purposes only. You cannot invest directly in an index. As you navigate today's volatile markets, we encourage you to review your investment goals with your financial professional and to make portfolio changes, as needed. For more up-to-date commentary on the economy and financial markets, we invite you to visit www.blackrock.com/funds. As always, we thank you for entrusting BlackRock with your investment assets, and we look forward to continuing to serve you in the months and years ahead. Sincerely, /s/ Rob Kapito Rob Kapito President, BlackRock Advisors, LLC 3 THIS PAGE NOT PART OF YOUR FUND REPORT Fund Summary Portfolio Management Commentary How did the Fund perform? o The Fund recently changed its fiscal year end to May 31. The Fund underperformed the broad-market Lehman Brothers Municipal Bond Index and the Lipper Intermediate Municipal Debt Funds category average for the 12-month period ended May 31, 2008. o The Fund focuses its investments on the intermediate portion of the municipal yield curve; therefore, the Lipper category average provides a truer representation of the Fund's composition and a more comparable means for measurement. What factors influenced performance? o U.S. Treasury yields generally moved lower (while prices correspondingly rose) during the year in response to weaker domestic economic growth and declining equity valuations. The Federal Reserve Board cut short-term interest rates seven times from 5.25% to 2.0%. Ten-year Treasury note yields declined nearly three times as much as 30-year bond yields. o The municipal market underperformed U.S. Treasury issues, as credit downgrades of the monoline insurers and disruption of the auction rate securities market weighed heavily on the sector. Long-term municipal bond yields were acutely affected. New issuance for the fiscal year was strong and essentially unchanged versus the same period in 2007, despite a 12% decline in the past six months. More recently, the pace has increased, alongside improved investor demand. o The Fund's lower-rated holdings detracted from comparative results amid a widening of credit spreads over the past year. An above-average cash reserve position (in keeping with a more defensive posture, particularly in early 2008) also curbed performance somewhat, as it prevented the Fund from fully participating in market improvement late in the period. o On the positive side, Fund performance benefited from an increase in exposure to high-quality municipals, including AAA-rated general obligation and pre-refunded bonds, which outperformed the broader market. Management intends to continue this portfolio restructuring going forward. Describe recent portfolio activity. o The Fund's cash flows were relatively stable throughout the 12-month period. We did commit some of the Fund's cash reserves to higher-quality issues as opportunities presented themselves. In addition, we purchased select lower-rated issues, particularly during periods of market volatility when market yields became historically attractive. The recent purchases moved the Fund's duration posture closer to that of its Lipper peers and also improved its distribution rate. Describe Fund positioning at period-end. o The Fund ended the annual period with a relatively neutral duration versus its Lipper peer group, a positioning that we believe should benefit performance in a stable to modestly rising interest rate environment. The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results. Performance Summary for the Period Ended May 31, 2008 Average Annual Total Returns 1 ----------------------------------------------------------- 1 Year 5 Years 10 Years ------------------ ------------------ ------------------ Standardized 6-Month w/o sales w/sales w/o sales w/sales w/o sales w/sales 30-Day Yield Total Returns charge charge charge charge charge charge - ------------------------------------------------------------------------------------------------------------------------------------ Institutional .......................... 3.49% 1.04% 3.65% -- 2.76% -- 4.32% -- Investor A ............................. 3.12 1.03 3.51 (0.89%) 2.52 1.64% 4.07 3.62% Investor A1 ............................ 3.38 0.99 3.65 2.61 2.67 2.47 4.21 4.11 Investor B ............................. 3.13 0.88 3.32 2.32 2.45 2.45 3.99 3.99 Investor C ............................. 2.48 0.55 2.73 1.73 1.76 1.76 3.29 3.29 Lehman Brothers Municipal Bond Index 2 . -- 1.44 3.87 -- 3.67 -- 5.06 -- - ------------------------------------------------------------------------------------------------------------------------------------ 1 Assuming maximum sales charges. See "About Fund Performance" on page 6 for a detailed description of share classes, including any related sales charges and fees. 2 This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds. 4 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Total Return Based on a $10,000 Investment A line graph depicting the growth of an investment in the Fund's Institutional and Investor A Shares compared to growth of an investment in the Lehman Brothers Municipal Bond Index. Values are from May 1998 to May 2008: Lehman Brothers Institutional Investor A Municipal Bond Shares(1,2) Shares(1,2) Index(3) 5/98 $10,000 $9,575 $10,000 5/99 $10,373 $9,908 $10,467 5/00 $10,317 $9,830 $10,377 5/01 $11,389 $10,823 $11,637 5/02 $12,132 $11,501 $12,394 5/03 $13,321 $12,597 $13,679 5/04 $13,312 $12,557 $13,674 5/05 $14,010 $13,183 $14,763 5/06 $14,163 $13,293 $15,042 5/07 $14,723 $13,784 $15,771 5/08 $15,260 $14,268 $16,381 1 Assuming maximum sales charge, if any, transaction costs and other operating expenses, including advisory fees. 2 The Fund invests primarily in a diversified portfolio of investment grade obligations whose interest is exempt from federal income taxes, with a dollar-weighted average maturity from five to 12 years. 3 This unmanaged Index consists of revenue bonds, prerefunded bonds, general obligation bonds and insured bonds. Past performance is not indicative of future results. Expense Example Including Interest Expense and Fees Actual Hypothetical 2 ------------------------------------------------------ ----------------------------------------------------- Beginning Ending Beginning Ending Account Value Account Value Expenses Paid Account Value Account Value Expenses Paid December 1, 2007 May 31, 2008 During the Period 1 December 1, 2007 May 31, 2008 During the Period 1 - ------------------------------------------------------------------------------------------------------------------------------------ Institutional ........ $1,000 $1,010.40 $4.10 $1,000 $1,020.82 $4.12 Investor A ........... $1,000 $1,010.30 $5.25 $1,000 $1,019.68 $5.27 Investor A1 .......... $1,000 $1,009.90 $4.60 $1,000 $1,020.33 $4.62 Investor B ........... $1,000 $1,008.80 $5.74 $1,000 $1,019.18 $5.77 Investor C ........... $1,000 $1,005.50 $9.13 $1,000 $1,015.80 $9.17 - ------------------------------------------------------------------------------------------------------------------------------------ 1 For each class of the Fund, expenses are equal to the annualized expense ratio for the class (0.82% for Institutional, 1.05% for Investor A, 0.92% for Investor A1, 1.15% for Investor B and 1.83% for Investor C), multiplied by the average account value over the period, multiplied by 182/366 (to reflect the one-half year period shown). 2 Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 366. See "Disclosure of Expenses" on page 6 for further information on how expenses were calculated. Expense Example Excluding Interest Expense and Fees Actual Hypothetical 2 ------------------------------------------------------ ----------------------------------------------------- Beginning Ending Beginning Ending Account Value Account Value Expenses Paid Account Value Account Value Expenses Paid December 1, 2007 May 31, 2008 During the Period 1 December 1, 2007 May 31, 2008 During the Period 1 - ------------------------------------------------------------------------------------------------------------------------------------ Institutional 3 ...... $1,000 $1,010.40 $3.70 $1,000 $1,021.22 $3.72 Investor A 3 ......... $1,000 $1,010.30 $4.85 $1,000 $1,020.08 $4.87 Investor A1 3 ........ $1,000 $1,009.90 $4.20 $1,000 $1,020.72 $4.22 Investor B 3 ......... $1,000 $1,008.80 $5.34 $1,000 $1,019.58 $5.37 Investor C 3 ......... $1,000 $1,005.50 $8.73 $1,000 $1,016.20 $8.77 - ------------------------------------------------------------------------------------------------------------------------------------ 1 For each class of the Fund, expenses are equal to the annualized expense ratio for the class (0.74% for Institutional, 0.97% for Investor A, 0.84% for Investor A1, 1.07% for Investor B and 1.75% for Investor C), multiplied by the average account value over the period, multiplied by 182/366 (to reflect the one-half year period shown). 2 Hypothetical 5% annual return before expenses is calculated by pro-rating the number of days in the most recent fiscal half year divided by 366. 3 Expenses are net of waiver, excluding interest expense and fees. See "Disclosure of Expenses" on page 6 for further information on how expenses were calculated. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 5 About Fund Performance o Institutional Shares are not subject to any sales charge. Institutional Shares bear no ongoing distribution or service fees and are available only to eligible investors. o Investor A Shares incur a maximum initial sales charge (front-end load) of 4.25% and a service fee of 0.25% per year (but no distribution fee). Investor A Shares commenced operations on October 2, 2006. Prior to Investor A Shares' inception, the returns for Investor A Shares are based upon the performance of the Fund's Institutional Shares. The returns for Investor A Shares, however, are adjusted to reflect the service (12b-1) fees applicable to Investor A Shares. o Investor A1 Shares incur a maximum initial sales charge (front-end load) of 1% and a service fee of 0.10% per year (but no distribution fee). o Investor B Shares are subject to a maximum contingent deferred sales charge of 1%, declining to 0% after three years. In addition, Investor B Shares are subject to a distribution fee of 0.10% per year and a service fee of 0.20% per year. These shares automatically convert to Investor A1 Shares after approximately 10 years. (There is no initial sales charge for automatic share conversions.) o Investor C Shares are subject to a distribution fee of 0.75% per year and a service fee of 0.25% per year. In addition, Investor C Shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. Investor C Shares commenced operations on October 2, 2006. Prior to Investor C Shares' inception, the returns for Investor C Shares are based upon the performance of the Fund's Institutional Shares. The returns for Investor C Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to Investor C Shares. Performance information reflects past performance and does not guarantee future results. Current performance may be lower or higher than the performance data quoted. Refer to www.blackrock.com/funds to obtain performance data current to the most recent month-end. Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares. Figures shown in the performance tables on pages 4 and 5 assume reinvestment of all dividends and capital gain distributions, if any, at net asset value on the payable date. The Fund's investment adviser reimbursed a portion of the Fund's expenses. Without such reimbursement, the Fund's performance would have been lower. Investment return and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Dividends paid to each class of shares will vary because of the different levels of service, distribution and transfer agency fees applicable to each class, which are deducted from the income available to be paid to shareholders. Disclosure of Expenses Shareholders of this Fund may incur the following charges: (a) expenses related to transactions, including sales charges, redemption fees and exchange fees; and (b) operating expenses, including advisory fees, distribution fees including 12b-1 fees, and other Fund expenses. The expense example on page 5 (which is based on a hypothetical investment of $1,000 invested on December 1, 2007 and held through May 31, 2008) is intended to assist shareholders both in calculating expenses based on an investment in the Fund and in comparing these expenses with similar costs of investing in other mutual funds. The table provides information about actual account values and actual expenses. In order to estimate the expenses a shareholder paid during the period covered by this report, shareholders can divide their account value by $1,000 and then multiply the result by the number corresponding to their share class under the heading entitled "Expenses Paid During the Period." The table also provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses. In order to assist shareholders in comparing the ongoing expenses of investing in this Fund and other funds, compare the 5% hypothetical example with the 5% hypothetical examples that appear in other funds' shareholder reports. The expenses shown in the table are intended to highlight shareholders' ongoing costs only and do not reflect any transactional expenses, such as sales charges, redemption fees or exchange fees. Therefore, the hypothetical table is useful in comparing ongoing expenses only, and will not help shareholders determine the relative total expenses of owning different funds. If these transactional expenses were included, shareholder expenses would have been higher. 6 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Portfolio Summary As of May 31, 2008 Percent of Distribution by Market Sector Long-Term Investments - -------------------------------------------------------------------------------- Other Revenue Bonds ..................................................... 68% General Obligation Bonds ................................................ 26 Mutual Funds ............................................................ 3 Prerefunded Bonds 1 ..................................................... 3 - -------------------------------------------------------------------------------- 1 Backed by an escrow fund. Quality Ratings by Percent of S&P/Moody's 2 Long-Term Investments - -------------------------------------------------------------------------------- AAA/Aaa ................................................................. 55% AA/Aa ................................................................... 16 A/A ..................................................................... 8 BBB/Baa ................................................................. 11 BB/Ba ................................................................... 1 Not Rated ............................................................... 9 - -------------------------------------------------------------------------------- 2 Using the higher of Standard & Poor's or Moody's Investors Service ratings. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 7 Schedule of Investments May 31, 2008 (Percentages shown are based on Net Assets) Par Municipal Bonds (000) Value =============================================================================== Alabama -- 0.3% Tuscaloosa, Alabama, Special Care Facilities Financing Authority, Residential Care Facility Revenue Bonds (Capstone Village, Inc. Project), Series A, 5.125%, 8/01/15 $ 500 $ 469,965 =============================================================================== Arizona -- 4.6% Arizona State Transportation Board, Highway Revenue Bonds, Series B, 5%, 7/01/17 5,000 5,452,250 Maricopa County, Arizona, School District Number 69 (Paradise Valley), GO (School Improvement Project), Series C, 4%, 7/01/14 (a) 1,185 1,230,374 Salt Verde Financial Corporation, Arizona, Senior Gas Revenue Bonds, 5.25%, 12/01/19 2,000 1,992,140 ------------ 8,674,764 =============================================================================== California -- 15.8% Agua Caliente Band of Cahuilla Indians, California, Casino Revenue Bonds, 5.60%, 7/01/13 875 871,780 Antelope Valley, California, Health Care District Revenue Bonds, Series A, 5.25%, 9/01/17 2,000 2,011,480 California County Tobacco Securitization Agency, Tobacco Revenue Bonds (Los Angeles County Securitization Corporation), 5.25%, 6/01/21 (c) 5,225 4,089,817 California State Department of Water Resources, Power Supply Revenue Bonds, Series A, 5.50%, 5/01/14 (d) 10,000 10,873,800 California State, GO, Refunding: 5%, 8/01/19 5,000 5,264,850 (Veterans Bonds), Series BG, 5.05%, 12/01/11 1,000 1,020,310 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Refunding Bonds, Senior Series A-1, 5%, 6/01/16 3,000 2,915,250 Southern California Public Power Authority, Natural Gas Project Number 1 Revenue Bonds, Series A, 5.25%, 11/01/19 2,445 2,520,795 ------------ 29,568,082 =============================================================================== Colorado -- 2.6% Denver, Colorado, City and County Airport Revenue Bonds, AMT, Series D, 7.75%, 11/15/13 (d) 4,430 4,947,114 =============================================================================== Connecticut -- 1.6% Hartford, Connecticut, GO, Series A, 5.25%, 8/15/18 (d) 2,685 2,943,190 =============================================================================== Florida -- 8.1% Broward County, Florida, School Board, COP, Series C, 5.25%, 7/01/17 (e) 3,410 3,647,609 Middle Village Community Development District, Florida, Special Assessment Bonds, Series C, 5.125%, 5/01/09 200 197,746 Orange County, Florida, School Board, COP, VRDN, Series B, 2.50%, 8/01/27 (b)(f) 1,100 1,100,000 Orlando, Florida, Greater Orlando Aviation Authority, Airport Facilities Revenue Bonds, AMT, Series A, 5.25%, 10/01/18 (g) 5,440 5,455,341 Panther Trace Community Development District II, Florida, Special Assessment Revenue Bonds: 5.125%, 11/01/13 995 915,360 Series A, 5%, 11/01/10 610 585,454 Sterling Hill Community Development District, Florida, Capital Improvement Revenue Refunding Bonds, Series B, 5.50%, 11/01/10 185 183,179 Tolomato Community Development District, Florida, Special Assessment Bonds, 6.375%, 5/01/17 3,130 3,091,157 ------------ 15,175,846 =============================================================================== Georgia -- 2.0% Fulton County, Georgia, Residential Care Facilities, Revenue Refunding Bonds (Canterbury Court Project), Series A, 5%, 2/15/14 1,050 1,033,053 Georgia State, GO, Series G, 5%, 12/01/17 (l) 2,500 2,788,725 ------------ 3,821,778 =============================================================================== Idaho -- 2.9% Ada and Canyon Counties, Idaho, Joint School District Number 2 (Meridian), GO, 5%, 8/15/17 5,000 5,436,300 =============================================================================== Illinois -- 1.7% Chicago, Illinois, Tax Allocation Bonds (Kingsbury Redevelopment Project), Series A, 6.57%, 2/15/13 1,000 1,004,610 Granite City, Madison County, Illinois, Disposal Revenue Bonds (Waster Management, Inc. Project), AMT, 5%, 5/03/10 1,500 1,498,260 Illinois State Finance Authority Revenue Bonds (Primary Health Care Centers Program), 5.90%, 7/01/14 715 703,860 ------------ 3,206,730 =============================================================================== Indiana -- 1.1% Indiana Bond Bank, Special Program Gas Revenue Bonds, Series A, 5%, 10/15/17 2,000 2,000,040 =============================================================================== Kentucky -- 1.1% Kenton County, Kentucky, Airport Board, Airport Revenue Refunding Bonds (Cincinnati/Northern Kentucky International Airport), AMT, Series A, 5.625%, 3/01/15 (f) 2,000 2,062,940 =============================================================================== Portfolio Abbreviations To simplify the listings of portfolio holdings in the Schedule of Investments, the names of many of the securities have been abbreviated according to the list on the right. AMT Alternative Minimum Tax (subject to) COP Certificates of Participation EDA Economic Development Authority GO General Obligation Bonds HDA Housing Development Authority IDA Industrial Development Authority PCR Pollution Control Revenue Bonds VRDN Variable Rate Demand Notes See Notes to Financial Statements. 8 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Schedule of Investments (continued) (Percentages shown are based on Net Assets) Par Municipal Bonds (000) Value =============================================================================== Louisiana -- 0.5% Morehouse Parish, Louisiana, PCR, Refunding (International Paper Company Project), Series A, 5.25%, 11/15/13 $ 1,000 $ 1,014,650 =============================================================================== Maryland -- 2.5% Anne Arundel County, Maryland, Consolidated General Improvements, GO, Refunding, 5%, 3/01/15 1,455 1,603,555 Maryland State, GO (State and Local Facilities Loan), First Series, 5%, 3/01/15 2,745 3,028,778 ------------ 4,632,333 =============================================================================== Massachusetts -- 5.2% Massachusetts State Industrial Finance Agency, Resource Recovery Revenue Refunding Bonds (Ogden Haverhill Project), AMT, Series A, 5.30%, 12/01/09 3,300 3,369,795 Massachusetts State Port Authority, Special Facilities Revenue Bonds (Delta Air Lines Inc. Project), AMT, Series A (d): 5.50%, 1/01/14 2,500 2,469,175 5.50%, 1/01/15 4,000 3,915,640 ------------ 9,754,610 =============================================================================== Michigan -- 1.4% Detroit, Michigan, Sewer Disposal Revenue Bonds, Senior Lien, VRDN, Series B, 1.25%, 7/01/33 (b)(e) 1,000 1,000,000 Michigan State Strategic Fund, PCR (General Motors Corporation Project), VRDN, 7%, 12/01/08 (b) 1,555 1,555,000 ------------ 2,555,000 =============================================================================== Minnesota -- 1.5% Minnesota State, GO, 5%, 6/01/18 2,500 2,727,500 =============================================================================== Mississippi -- 0.5% Mississippi Business Finance Corporation, Mississippi, PCR, Refunding (System Energy Resources Inc. Project), 5.90%, 5/01/22 1,000 990,590 =============================================================================== Nebraska -- 1.4% Omaha Convention Hotel Corporation, Nebraska, First Tier Revenue Refunding Bonds, 5%, 2/01/19 (d) 2,435 2,552,805 =============================================================================== New Jersey -- 1.4% New Jersey EDA, School Facilities Construction, Revenue Refunding Bonds, Series W, 5%, 9/01/15 2,500 2,694,550 =============================================================================== New York -- 5.9% New York City, New York, GO, Refunding, Series A, 5%, 8/01/19 2,500 2,652,575 New York State Dormitory Authority, Non-State Supported Debt, Revenue Refunding Bonds (New York University Hospital Center), Series A, 5%, 7/01/16 1,140 1,135,451 New York State, GO, Series A, 4%, 3/01/16 2,000 2,068,680 Port Authority of New York and New Jersey, Consolidated Revenue Bonds, AMT: 131st Series, 5%, 12/15/14 1,000 1,052,110 Thirty-Seventh Series, 5.50%, 7/15/18 (e) 3,000 3,170,820 Westchester County, New York, IDA, Continuing Care Retirement, Mortgage Revenue Bonds (Kendal on the Hudson Project), Series A, 5.625%, 1/01/13 1,000 1,002,950 ------------ 11,082,586 =============================================================================== North Carolina -- 4.9% North Carolina Municipal Power Agency Number 1, Catawba Electric Revenue Bonds, Series A, 5.25%, 1/01/20 (f) 3,500 3,642,835 North Carolina State, GO, Refunding, Series B, 5%, 4/01/17 5,000 5,557,550 ------------ 9,200,385 =============================================================================== Ohio -- 2.5% Ohio State, GO, Series L, 5%, 10/01/14 1,835 2,016,922 Ohio State, Highway Capital Improvements, GO, Series L, 5%, 5/01/16 2,340 2,582,588 ------------ 4,599,510 =============================================================================== Oregon -- 3.0% Oregon State Department of Transportation, Highway User Tax Revenue Bonds, Series A, 5%, 11/15/16 (h) 5,000 5,551,900 =============================================================================== Pennsylvania -- 0.5% Lancaster County, Pennsylvania, Hospital Authority Revenue Bonds (Brethren Village Project), Series A, 5.20%, 7/01/12 1,000 1,015,680 =============================================================================== Tennessee -- 0.9% Tennessee HDA, Revenue Bonds (Homeownership Program), AMT, Series 2-C, 5.85%, 7/01/09 1,600 1,619,312 =============================================================================== Texas -- 10.1% Bell County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Scott & White Memorial Hospital), VRDN, Series B-2, 1.35%, 8/15/29 (b)(f) 235 235,000 Dallas-Fort Worth, Texas, International Airport, Joint Revenue Bonds, AMT, Sub-Series C-1, 4.75%, 11/01/13 (f) 2,500 2,506,025 Dallas-Fort Worth, Texas, International Airport Revenue Refunding and Improvement Bonds, AMT, Series A, 5.75%, 11/01/14 (g) 5,000 5,155,550 Houston, Texas, Airport System, Subordinate Lien Revenue Refunding Bonds, AMT, Series A, 5.875%, 7/01/15 (e) 5,000 5,218,800 Houston, Texas, Combined Utility System, First Lien Revenue Refunding Bonds, Series B, 5%, 11/15/18 (g) 2,475 2,599,789 San Antonio, Texas, Airport System, Improvement Revenue Bonds, AMT, 5.25%, 7/01/19 (e) 3,055 3,150,591 ------------ 18,865,755 =============================================================================== Virginia -- 3.5% Fredericksburg, Virginia, EDA, Hospital Facilities Revenue Refunding Bonds (MediCorp Health System), 5%, 6/15/17 2,500 2,610,850 The Shops at White Oak Village Community Development Authority, Virginia, Special Assessment Revenue Bonds, 5.30%, 3/01/17 4,000 3,861,200 ------------ 6,472,050 =============================================================================== Washington -- 2.7% Kitsap County, Washington, School District Number 400 (North Kitsap), GO, Refunding, 5.125%, 12/01/16 (e) 4,650 5,098,865 =============================================================================== See Notes to Financial Statements. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 9 Schedule of Investments (concluded) (Percentages shown are based on Net Assets) Par Municipal Bonds (000) Value =============================================================================== Puerto Rico -- 3.1% Puerto Rico Commonwealth Government Development Bank, Senior Revenue Bonds, Series B, 5%, 12/01/17 $ 1,500 $ 1,502,475 Puerto Rico Commonwealth Infrastructure Financing Authority, Special Tax and Capital Appreciation Revenue Bonds, Series B, 5%, 7/01/18 3,250 3,255,200 Puerto Rico Commonwealth, Public Improvement, GO, Series B, 5.25%, 7/01/17 1,000 1,019,410 ------------ 5,777,085 =============================================================================== Total Municipal Bonds (Cost -- $174,464,659) -- 93.3% 174,511,915 =============================================================================== Municipal Bonds Transferred to Tender Option Bond Trusts (i) =============================================================================== Illinois -- 5.6% Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A-2 (e): 5.25%, 1/01/13 5,000 5,249,075 5.25%, 1/01/14 5,000 5,249,075 - ------------------------------------------------------------------------------- Total Municipal Bonds Transferred to Tender Option Bond Trusts (Cost -- $10,631,414) -- 5.6% 10,498,150 =============================================================================== Mutual Funds Shares Value =============================================================================== BlackRock Insured Municipal 2008 Term Trust, Inc. (j) 244,000 $ 3,669,760 BlackRock Insured Municipal Term Trust, Inc. (j) 99,700 1,011,955 - ------------------------------------------------------------------------------- Total Mutual Funds (Cost -- $5,249,625) -- 2.5% 4,681,715 =============================================================================== =============================================================================== Short-Term Securities =============================================================================== Merrill Lynch Institutional Tax-Exempt Fund, 1.71% (j)(k) 19,316 19,316 - ------------------------------------------------------------------------------- Total Short-Term Securities (Cost -- $19,316) -- 0.0% 19,316 =============================================================================== Total Investments (Cost -- $190,365,014*) -- 101.4% 189,711,096 Other Assets Less Liabilities -- 1.3% 2,399,277 Liability for Trust Certificates, Including Interest Expense and Fees Payable -- (2.7%) (5,058,575) ------------ Net Assets -- 100.0% $187,051,798 ============ * The cost and unrealized appreciation (depreciation) of investments as of May 31, 2008, as computed for federal income tax purposes, were as follows: Aggregate cost ......................................... $ 185,160,550 ============= Gross unrealized appreciation .......................... $ 2,287,396 Gross unrealized depreciation .......................... (2,736,850) ------------- Net unrealized depreciation ............................ $ (449,454) ============= (a) Assured Guaranty Insured. (b) Variable rate security. Rate shown is as of report date. Maturity shown is the final maturity date. (c) Represents a zero-coupon bond. Rate shown reflects the effective yield at the time of purchase. (d) AMBAC Insured. (e) FSA Insured. (f) MBIA Insured. (g) FGIC Insured. (h) 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. (i) Securities represent bonds transferred to a tender option bond trust in exchange for which the Fund acquired residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to tender option bond trusts. (j) 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: -------------------------------------------------------------------------- Purchase Sale Realized Dividend Affiliate Cost Cost Gain Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund $26 1 -- -- $ 2,219 BlackRock Insured Municipal 2008 Term Trust, Inc. -- -- -- $92,620 BlackRock Insured Municipal Term Trust, Inc. -- -- -- $22,143 -------------------------------------------------------------------------- 1 Represents net purchase cost. (k) Represents the current yield as of report date. (l) When-issued security. See Notes to Financial Statements. 10 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Statement of Assets and Liabilities May 31, 2008 =================================================================================================================================== Assets - ----------------------------------------------------------------------------------------------------------------------------------- Investments at value -- unaffiliated (cost -- $185,096,073) ...................................................... $ 185,010,065 Investments at value -- affiliated (cost -- $5,268,941) .......................................................... 4,701,031 Cash ............................................................................................................. 73,816 Interest receivable .............................................................................................. 2,585,414 Capital shares sold receivable ................................................................................... 522,759 Dividends from affiliates receivable ............................................................................. 14,623 Prepaid expenses ................................................................................................. 23,827 ------------- Total assets ..................................................................................................... 192,931,535 ------------- =================================================================================================================================== Accrued Liabilities - ----------------------------------------------------------------------------------------------------------------------------------- Income dividends payable ......................................................................................... 529,759 Capital shares redeemed payable .................................................................................. 102,423 Investment advisory fees payable ................................................................................. 81,576 Interest expense and fees payable ................................................................................ 58,575 Other liabilities payable ........................................................................................ 177 Distribution fees payable ........................................................................................ 11,659 Officer's and Trustees' fees payable ............................................................................. 3,202 Other affiliates payable ......................................................................................... 16,322 Other accrued expenses payable ................................................................................... 76,044 ------------- Total accrued liabilities ........................................................................................ 879,737 ------------- =================================================================================================================================== Other Liabilities - ----------------------------------------------------------------------------------------------------------------------------------- Trust certificates 1 ............................................................................................. 5,000,000 ------------- Total Liabilities ................................................................................................ 5,879,737 ------------- =================================================================================================================================== Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Net assets ....................................................................................................... $ 187,051,798 ============= =================================================================================================================================== Net Assets Consist of - ----------------------------------------------------------------------------------------------------------------------------------- Institutional Shares, $0.10 par value ............................................................................ $ 1,125,050 Investor A Shares, $0.10 par value ............................................................................... 55,149 Investor A1 Shares, $0.10 par value .............................................................................. 562,021 Investor B Shares, $0.10 par value ............................................................................... 61,050 Investor C Shares, $0.10 par value ............................................................................... 42,855 Paid-in capital in excess of par ................................................................................. 186,605,032 Undistributed net investment income .............................................................................. 184,586 Accumulated net realized loss .................................................................................... (930,027) Net unrealized appreciation/depreciation ......................................................................... (653,918) ------------- Net assets ....................................................................................................... $ 187,051,798 ============= =================================================================================================================================== Net Asset Value - ----------------------------------------------------------------------------------------------------------------------------------- Institutional -- Based on net assets of $114,011,543 and 11,250,495 shares of beneficial interests outstanding ... $ 10.13 ============= Investor A -- Based on net assets of $5,584,969 and 551,494 shares of beneficial interests outstanding ........... $ 10.13 ============= Investor A1 -- Based on net assets of $56,928,185 and 5,620,214 shares of beneficial interests outstanding ....... $ 10.13 ============= Investor B -- Based on net assets of $6,185,843 and 610,503 shares of beneficial interests outstanding ........... $ 10.13 ============= Investor C -- Based on net assets of $4,341,258 and 428,548 shares of beneficial interests outstanding ........... $ 10.13 ============= 1 Represents short-term floating rate certificates issued by tender option bond trusts. See Notes to Financial Statements. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 11 Statements of Operations Period November 1, 2007 to Year Ended May 31, October 31, 2008 2007 =================================================================================================================================== Investment Income - ----------------------------------------------------------------------------------------------------------------------------------- Interest ........................................................................................... $ 5,147,641 $ 8,506,532 Dividends from affiliates .......................................................................... 116,982 376,413 --------------------------- Total income ....................................................................................... 5,264,623 8,882,945 --------------------------- =================================================================================================================================== Expenses - ----------------------------------------------------------------------------------------------------------------------------------- Investment advisory ................................................................................ 620,789 1,020,973 Accounting services ................................................................................ 48,676 84,317 Professional ....................................................................................... 45,340 86,154 Printing ........................................................................................... 44,179 63,246 Registration ....................................................................................... 44,795 59,143 Service -- Investor A .............................................................................. 6,818 4,391 Service -- Investor A1 ............................................................................. 34,118 64,316 Service and distribution -- Investor B ............................................................. 11,749 24,522 Service and distribution -- Investor C ............................................................. 17,947 13,185 Transfer agent -- Institutional .................................................................... 32,458 53,627 Transfer agent -- Investor A ....................................................................... 428 1,013 Transfer agent -- Investor A1 ...................................................................... 16,097 28,395 Transfer agent -- Investor B ....................................................................... 2,476 4,736 Transfer agent -- Investor C ....................................................................... 520 648 Officer and Trustees ............................................................................... 16,386 23,943 Custodian .......................................................................................... 8,647 13,838 Miscellaneous ...................................................................................... 26,052 40,751 --------------------------- Total expenses excluding interest expense and fees ................................................. 977,475 1,587,198 Interest expense and fees1 ......................................................................... 95,924 423,737 --------------------------- Total expenses ..................................................................................... 1,073,399 2,010,935 Less fees waived by advisor ........................................................................ (56,538) (92,856) Less fees paid indirectly .......................................................................... (277) -- --------------------------- Total expenses after fees waived and paid indirectly ............................................... 1,016,584 1,918,079 --------------------------- Net investment income .............................................................................. 4,248,039 6,964,866 --------------------------- =================================================================================================================================== Realized and Unrealized Gain (Loss) - ----------------------------------------------------------------------------------------------------------------------------------- Net realized gain (loss) from: Investments .................................................................................... 1,135,401 352,145 Futures and forward interest rate swaps ........................................................ (80,018) (100,200) --------------------------- 1,055,383 251,945 --------------------------- Net change in unrealized appreciation/depreciation on: Investments .................................................................................... (1,726,345) (2,606,099) Forward interest rate swaps .................................................................... -- 251,982 --------------------------- (1,726,345) (2,354,117) --------------------------- Total realized and unrealized loss ................................................................. (670,962) (2,102,172) --------------------------- Net Increase in Net Assets Resulting from Operations ............................................... $ 3,577,077 $ 4,862,694 =========================== 1 Related to tender option bond trusts. See Notes to Financial Statements. 12 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Statements of Changes in Net Assets Period November 1, Year Ended 2007 to October 31, May 31, ----------------------------- Increase (Decrease) in Net Assets: 2008 2007 2006 =================================================================================================================================== Operations - ----------------------------------------------------------------------------------------------------------------------------------- Net investment income ............................................................. $ 4,248,039 $ 6,964,866 $ 6,463,395 Net realized gain (loss) .......................................................... 1,055,383 251,945 (1,688,727) Net change in unrealized appreciation/depreciation ................................ (1,726,345) (2,354,117) 4,081,586 --------------------------------------------- Net increase in net assets resulting from operations .............................. 3,577,077 4,862,694 8,856,254 --------------------------------------------- =================================================================================================================================== Dividends and Distributions to Shareholders From - ----------------------------------------------------------------------------------------------------------------------------------- Net investment income: Institutional ................................................................. (2,677,237) (4,106,295) (3,600,332) Investor A .................................................................... (98,132) (60,549) (243) Investor A1 ................................................................... (1,271,996) (2,341,365) (1,810,323) Investor B .................................................................... (137,590) (280,255) (405,591) Investor C .................................................................... (50,440) (35,579) (206) Class C ....................................................................... -- -- (646,700) Net realized gain: Institutional ................................................................. -- -- (2,007,396) Investor A .................................................................... -- -- -- Investor A1 ................................................................... -- -- (969,703) Investor B .................................................................... -- -- (284,047) Investor C .................................................................... -- -- -- Class C ....................................................................... -- -- (491,006) --------------------------------------------- Decrease in net assets resulting from dividends and distributions to shareholders . (4,235,395) (6,824,043) (10,215,547) --------------------------------------------- =================================================================================================================================== Beneficial Interest Transactions - ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets derived from beneficial interest transactions (4,775,783) 13,314,783 (8,046,361) --------------------------------------------- =================================================================================================================================== Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets ........................................... (5,434,101) 11,353,434 (9,405,654) Beginning of period ............................................................... 192,485,899 181,132,465 190,538,119 ============================================= End of period ..................................................................... $ 187,051,798 $ 192,485,899 $ 181,132,465 ============================================= End of period undistributed net investment income ................................. $ 184,586 $ 177,757 $ 36,934 ============================================= See Notes to Financial Statements. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 13 Financial Highlights Institutional ------------------------------------------------------------------------------ Period Nov. 1, 2007 to Year Ended October 31, May 31, ---------------------------------------------------------------- 2008 2007 2006 2005 2004 2003 ======================================================================================================================= Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .. $ 10.17 $ 10.28 $ 10.36 $ 10.76 $ 10.71 $ 10.69 ------------------------------------------------------------------------------ Net investment income 1 ............... 0.23 0.39 0.37 0.38 0.40 0.40 Net realized and unrealized gain (loss) (0.04) (0.12) 0.13 (0.34) 0.08 0.10 ------------------------------------------------------------------------------ Net increase from investment operations 0.19 0.27 0.50 0.04 0.48 0.50 ------------------------------------------------------------------------------ Dividends and distributions from: Net investment income ............. (0.23) (0.38) (0.37) (0.38) (0.40) (0.41) Net realized gain ................. -- -- (0.21) (0.06) (0.03) (0.07) ------------------------------------------------------------------------------ Total dividends and distributions ..... (0.23) (0.38) (0.58) (0.44) (0.43) (0.48) ------------------------------------------------------------------------------ Net asset value, end of period ........ $ 10.13 $ 10.17 $ 10.28 $ 10.36 $ 10.76 $ 10.71 ============================================================================== ======================================================================================================================= Total Investment Return 2 Based on net asset value .............. 1.85% 3 2.69% 4.96% 0.40% 4.57% 4.77% ============================================================================== ======================================================================================================================= Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------- Total expenses after fees waived and paid indirectly and excluding interest expense and fees 4 ......... 0.75% 5 0.75% 0.73% 0.74% 0.79% 0.85% ============================================================================== Total expenses after fees waived and paid indirectly ..................... 0.84% 5 0.98% 1.11% 1.00% 0.91% 0.94% ============================================================================== Total expenses after fees waived and before fees paid indirectly ......... 0.84% 5 0.98% 1.11% 1.00% 0.91% 0.94% ============================================================================== Total expenses ........................ 0.89% 5 1.03% 1.16% 1.05% 0.94% 0.96% ============================================================================== Net investment income ................. 3.82% 5 3.81% 3.61% 3.63% 3.76% 3.80% ============================================================================== ======================================================================================================================= Supplemental Data - ----------------------------------------------------------------------------------------------------------------------- Net assets, end of period (000) ....... $114,012 $120,499 $ 99,678 $100,831 $ 78,777 $ 44,372 ============================================================================== Portfolio turnover .................... 32% 54% 102% 162% 176% 179% ============================================================================== 1 Based on average shares outstanding. 2 Total investment returns exclude the effects of any sales charges. 3 Aggregate total investment return. 4 Interest expense and fees relate to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to tender option bond trusts. 5 Annualized. See Notes to Financial Statements. 14 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Financial Highlights (continued) Investor A ------------------------------------- Period Period Nov. 1, Year Oct. 2, 2007 to Ended 2006 1 to May 31, Oct. 31, Oct. 31, 2008 2007 2006 ============================================================================== Per Share Operating Performance - ------------------------------------------------------------------------------ Per Share Operating Performance Net asset value, beginning of period .. $ 10.16 $ 10.27 $ 10.26 ------------------------------------- Net investment income 2 ............... 0.22 0.36 0.02 Net realized and unrealized gain (loss) (0.04) (0.11) 0.02 ------------------------------------- Net increase from investment operations 0.18 0.25 0.04 ------------------------------------- Dividends and distributions from: Net investment income ............. (0.21) (0.36) (0.03) Net realized gain ................. -- -- -- ------------------------------------- Total dividends and distributions ..... (0.21) (0.36) (0.03) ------------------------------------- Net asset value, end of period ........ $ 10.13 $ 10.16 $ 10.27 ===================================== ============================================================================== Total Investment Return 3 - ------------------------------------------------------------------------------ Based on net asset value .............. 1.82% 4 2.43% 0.36% 4 ===================================== ============================================================================== Ratios to Average Net Assets - ------------------------------------------------------------------------------ Total expenses after fees waived and paid indirectly and excluding interest expense and fees 5 ......... 0.97% 6 1.01% 0.97% 6 ===================================== Total expenses after fees waived and paid indirectly ..................... 1.06% 6 1.23% 1.34% 6 ===================================== Total expenses after fees waived and before fees paid indirectly ......... 1.06% 6 1.23% 1.34% 6 ===================================== Total expenses ........................ 1.11% 6 1.28% 1.39% 6 ===================================== Net investment income ................. 3.60% 6 3.54% 3.08% 6 ===================================== ============================================================================== Supplemental Data - ------------------------------------------------------------------------------ Net assets, end of period (000) ....... $ 5,585 $ 2,786 $ 160 ===================================== Portfolio turnover .................... 32% 54% 102% ===================================== Investor A1 ------------------------------------------------------------------------------ Period Nov. 1, 2007 to Year Ended November 30, May 31, ---------------------------------------------------------------- 2008 2007 2006 2005 2004 2003 ======================================================================================================================= Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------- Per Share Operating Performance Net asset value, beginning of period .. $ 10.16 $ 10.28 $ 10.35 $ 10.76 $ 10.71 $ 10.69 ------------------------------------------------------------------------------ Net investment income 2 ............... 0.22 0.38 0.35 0.38 0.39 0.40 Net realized and unrealized gain (loss) (0.03) (0.13) 0.15 (0.36) 0.08 0.09 ------------------------------------------------------------------------------ Net increase from investment operations 0.19 0.25 0.50 0.02 0.47 0.49 ------------------------------------------------------------------------------ Dividends and distributions from: Net investment income ............. (0.22) (0.37) (0.36) (0.37) (0.39) (0.40) Net realized gain ................. -- -- (0.21) (0.06) (0.03) (0.07) ------------------------------------------------------------------------------ Total dividends and distributions ..... (0.22) (0.37) (0.57) (0.43) (0.42) (0.47) ------------------------------------------------------------------------------ Net asset value, end of period ........ $ 10.13 $ 10.16 $ 10.28 $ 10.35 $ 10.76 $ 10.71 ============================================================================== ======================================================================================================================= Total Investment Return 3 - ----------------------------------------------------------------------------------------------------------------------- Based on net asset value .............. 1.89% 4 2.49% 4.96% 0.20% 4.47% 4.68% ============================================================================== ======================================================================================================================= Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------- Total expenses after fees waived and paid indirectly and excluding interest expense and fees 5 ......... 0.85% 6 0.84% 0.83% 0.84% 0.89% 0.95% ============================================================================== Total expenses after fees waived and paid indirectly ..................... 0.94% 6 1.07% 1.20% 1.11% 1.01% 1.04% ============================================================================== Total expenses after fees waived and before fees paid indirectly ......... 0.94% 6 1.07% 1.20% 1.11% 1.01% 1.04% ============================================================================== Total expenses ........................ 0.99% 6 1.12% 1.25% 1.16% 1.04% 1.06% ============================================================================== Net investment income ................. 3.71% 6 3.71% 3.50% 3.54% 3.66% 3.70% ============================================================================== ======================================================================================================================= Supplemental Data - ----------------------------------------------------------------------------------------------------------------------- Net assets, end of period (000) ....... $ 56,928 $ 60,208 $ 71,327 $ 48,524 $ 55,128 $ 51,786 ============================================================================== Portfolio turnover .................... 32% 54% 102% 162% 176% 179% ============================================================================== 1 Commencement of operations. 2 Based on average shares outstanding. 3 Total investment returns exclude the effects of sales charges. 4 Aggregate total investment return. 5 Interest expense and fees relate to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to tender option bond trusts. 6 Annualized. See Notes to Financial Statements. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 15 Financial Highlights (continued) Investor B ------------------------------------------------------------------------------ Period Nov. 1, 2007 to Year Ended October 31, May 31, ---------------------------------------------------------------- 2008 2007 2006 2005 2004 2003 ======================================================================================================================= Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .. $ 10.17 $ 10.28 $ 10.36 $ 10.76 $ 10.71 $ 10.69 ------------------------------------------------------------------------------ Net investment income 1 ............... 0.21 0.36 0.34 0.35 0.37 0.38 Net realized and unrealized gain (loss) (0.04) (0.12) 0.15 (0.34) 0.08 0.09 ------------------------------------------------------------------------------ Net increase from investment operations 0.17 0.24 0.49 0.01 0.45 0.47 ------------------------------------------------------------------------------ Dividends and distributions from: Net investment income ............. (0.21) (0.35) (0.36) (0.35) (0.37) (0.38) Net realized gain ................. -- -- (0.21) (0.06) (0.03) (0.07) ------------------------------------------------------------------------------ Total dividends and distributions ..... (0.21) (0.35) (0.57) (0.41) (0.40) (0.45) ------------------------------------------------------------------------------ Net asset value, end of period ........ $ 10.13 $ 10.17 $ 10.28 $ 10.36 $ 10.76 $ 10.71 ============================================================================== ======================================================================================================================= Total Investment Return 2 - ----------------------------------------------------------------------------------------------------------------------- Based on net asset value .............. 1.66% 3 2.36% 4.64% 0.08% 4.24% 4.46% ============================================================================== ======================================================================================================================= Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------- Total expenses after fees waived and paid indirectly and excluding interest expense and fees 4 ......... 1.06% 5 1.06% 1.05% 1.05% 1.10% 1.17% ============================================================================== Total expenses after fees waived and paid indirectly ..................... 1.15% 5 1.29% 1.42% 1.32% 1.22% 1.26% ============================================================================== Total expenses after fees waived and before fees paid indirectly ......... 1.15% 5 1.29% 1.42% 1.32% 1.22% 1.26% ============================================================================== Total expenses ........................ 1.20% 5 1.34% 1.47% 1.37% 1.25% 1.27% ============================================================================== Net investment income ................. 3.50% 5 3.50% 3.30% 3.34% 3.45% 3.48% ============================================================================== ======================================================================================================================= Supplemental Data - ----------------------------------------------------------------------------------------------------------------------- Net assets, end of period (000) ....... $ 6,186 $ 6,920 $ 9,760 $ 14,982 $ 21,623 $ 28,678 ============================================================================== Portfolio turnover .................... 32% 54% 102% 162% 176% 179% ============================================================================== 1 Based on average shares outstanding. 2 Total investment returns exclude the effects of sales charges. 3 Aggregate total investment return. 4 Interest expense and fees relate to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to tender option bond trusts. 5 Annualized. See Notes to Financial Statements. 16 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Financial Highlights (concluded) Investor C Investor C ------------------------------------- Period Period Nov. 1, October 2, 2007 to Year Ended 2006 1 to May 31, October 31, October 31, 2008 2007 2006 ================================================================================================================================= Per Share Operating Performance - --------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period ................................................... $ 10.17 $ 10.28 $ 10.26 ------------------------------------- Net investment income 2 ................................................................ 0.17 0.28 0.01 Net realized and unrealized gain (loss) ................................................ (0.04) (0.11) 0.03 ------------------------------------- Net increase from investment operations ................................................ 0.13 0.17 0.04 ------------------------------------- Dividends from net investment income ................................................... (0.17) (0.28) (0.02) ------------------------------------- Net asset value, end of period ......................................................... $ 10.13 $ 10.17 $ 10.28 ===================================== ================================================================================================================================ Total Investment Return 3 - -------------------------------------------------------------------------------------------------------------------------------- Based on net asset value ............................................................... 1.27% 4 1.67% 0.40% 4 ===================================== ================================================================================================================================ Ratios to Average Net Assets - -------------------------------------------------------------------------------------------------------------------------------- Total expenses after fees waived and paid indirectly and excluding interest expense and fees 5 1.75% 6 1.75% 1.73% 6 ===================================== Total expenses after fees waived and paid indirectly ................................... 1.83% 6 1.98% 2.09% 6 ===================================== Total expenses after fees waived and before fees paid underway ......................... 1.83% 6 1.98% 2.09% 6 ===================================== Total expenses ......................................................................... 1.88% 6 2.03% 2.14% 6 ===================================== Net investment income .................................................................. 2.82% 6 2.79% 2.36% 6 ===================================== ================================================================================================================================ Supplemental Data - -------------------------------------------------------------------------------------------------------------------------------- Net assets, end of period (000) ........................................................ $ 4,341 $ 2,074 $ 207 ===================================== Portfolio turnover ..................................................................... 32% 54% 102% ===================================== 1 Commencement of operations. 2 Based on average shares outstanding. 3 Total investment returns exclude the effects of sales charges. 4 Aggregate total investment return. 5 Interest expense and fees relate to tender option bond trusts. See Note 1 of the Notes to Financial Statements for details of municipal bonds transferred to tender option bond trusts. 6 Annualized. See Notes to Financial Statements. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 17 Notes to Financial Statements 1. Significant Accounting Policies: BlackRock Intermediate Municipal Fund (the "Fund") is presently the only series of BlackRock Municipal Series Trust (the "Trust"). The Fund is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as a diversified, open-end management investment company. The Fund's financial statements are prepared in conformity with accounting principles generally accepted in the United States of America, which may require the use of management accruals and estimates. Actual results may differ from these estimates. The Fund recently changed its fiscal year end to May 31. The Fund offers multiple classes of shares. Institutional Shares are sold only to certain eligible investors. Investor A Shares are generally sold with a front-end sales charge. Investor A1 and Investor B Shares are not generally available except for dividend and capital gains investment. Shares of Investor B and Investor C may be subject to a contingent deferred sales charge. All classes of shares have identical voting, dividend, liquidation and other rights and the same terms and conditions, except that Investor A, Investor A1, Investor B and Investor C Shares bear certain expenses related to the shareholder servicing of such shares, and Investor B and Investor C Shares also bear certain expenses related to the distribution of such shares. Each class has exclusive voting rights with respect to matters relating to its shareholder servicing and distribution expenditures (except that Investor B shareholders may vote on material changes to the Investor A1 distribution plan). The following is a summary of significant accounting policies followed by the Fund: Valuation of Investments: Municipal investments (including commitments to purchase such investments on a "when-issued" basis) are valued on the basis of prices provided by dealers or pricing services selected under the supervision of the Trust's Board of Trustees (the "Board"). In determining the value of a particular investment, pricing services may use certain information with respect to transactions in such investments, quotations from dealers, pricing matrixes, market transactions in comparable investments and various relationships between investments. Financial futures contracts are traded on exchanges and are valued at their last sale price. Short-term securities are valued at amortized cost. In the event that application of these methods of valuation results in a price for an investment which is deemed not to be representative of the market value of such investment, the investment will be valued by a method approved by the Board as reflecting fair value ("Fair Value Assets"). When determining the price for Fair Value Assets, the investment advisor and/or the sub-advisor seeks to determine the price that the Fund might reasonably expect to receive from the current sale of that asset in an arm's-length transaction. Fair value determinations shall be based upon all available factors that the investment advisor and/or the sub-advisor deems relevant. The pricing of all Fair Value Assets is subsequently reported to the Board or a committee thereof. Derivative Financial Instruments: The Fund may engage in various portfolio investment strategies both to increase the return of the Fund and to hedge, or protect, its exposure to interest rate movements and movements in the securities markets. Losses may arise if the value of the contract decreases due to an unfavorable change in the price of the underlying security or if the counterparty does not perform under the contract. o Financial futures contracts -- The Fund may purchase or sell financial futures contracts and options on such financial futures contracts. Futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yield. Upon entering into a contract, the Fund deposits, and maintains as collateral, such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Fund agrees to receive from, or pay to, the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as margin variation and are recognized by the Fund as unrealized gains or losses. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. o Forward interest rate swaps -- The Fund may enter into forward interest rate swaps. In a forward interest rate swap, the Fund and the counterparty agree to make periodic net payments on a specified notional contract amount, commencing on a specified future effective date, unless terminated earlier. Changes in the value of the forward interest rate swap are recognized as unrealized gains and losses. When the agreement is closed, the Fund records a realized gain or loss in an amount equal to the value of the agreement. The Fund generally intends to close each forward interest rate swap before the effective date specified in the agreement and therefore avoid entering into the interest rate swap underlying each forward interest rate swap. 18 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Notes to Financial Statements (continued) Forward Commitments and When-Issued Delayed Delivery Securities: The Fund may purchase securities on a when-issued basis and may purchase or sell securities on a forward commitment basis. Settlement of such transactions normally occurs within a month or more after the purchase or sale commitment is made. The Fund may purchase securities under such conditions only with the intention of actually acquiring them, but may enter into a separate agreement to sell the securities before the settlement date. Since the value of securities purchased may fluctuate prior to settlement, the Fund may be required to pay more at settlement than the security is worth. In addition, the purchaser is not entitled to any of the interest earned prior to settlement. Upon making a commitment to purchase a security on a when-issued basis, the Fund will hold liquid assets worth at least the equivalent of the amount due. Municipal Bonds Transferred to Tender Option Bond Trusts: The Fund leverages its assets through the use of tender option bond trusts ("TOBs"). A TOB is established by a third party sponsor forming a special purpose entity, into which one or more funds, or an agent on behalf of the funds, transfers municipal securities. Other funds managed by the investment advisor may also contribute municipal securities to a TOB into which the Fund has contributed securities. A TOB typically issues two classes of beneficial interests: short-term floating rate certificates, which are sold to third party investors, and residual certificates ("TOB Residuals"), which are generally issued to the participating funds that made the transfer. The TOB Residuals held by the Fund include the right of the Fund (1) to cause the holders of a proportional share of the floating rate certificates to tender their certificates at par, and (2) to transfer, within seven days, a corresponding share of the municipal securities from the TOB to the Fund. The cash received by the TOB from the sale of the short-term floating rate certificates, less transaction expenses, is paid to the Fund, which typically invests the cash in additional municipal securities. The Fund's transfer of the municipal securities to a TOB is accounted for as a secured borrowing, therefore the municipal securities deposited into a TOB are presented in the Fund's Schedule of Investments and the proceeds from the transaction are reported as a liability of the Fund. Interest income from the underlying securities is recorded by the Fund on an accrual basis. Interest expense incurred on the secured borrowing and other expenses related to remarketing, administration and trustee services to a TOB are reported as expenses of the Fund. The floating rate certificates have interest rates that generally reset weekly and their holders have the option to tender certificates to the TOB for redemption at par at each reset date. At May 31, 2008, the aggregate value of the underlying municipal securities transferred to TOBs was $10,498,150, the related liability for trust certificates was $5,000,000, and the interest rate was 2.793%. Financial transactions executed through TOBs generally will underperform the market for fixed rate municipal bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Should short-term interest rates rise, the Fund's investment in TOBs likely will adversely affect the Fund's investment income and dividends to shareholders. Fluctuations in the market value of municipal securities deposited into the TOB may adversely affect the Fund's net asset values per share. Zero-Coupon Bonds: The Fund may invest in zero-coupon bonds, which are normally issued at a significant discount from face value and do not provide for periodic interest payments. Zero-coupon bonds may experience greater volatility in market value than similar maturity debt obligations which provide for regular interest payments. Segregation: In cases in which the 1940 Act and the interpretive positions of the Securities and Exchange Commission ("SEC") require that the Fund segregate assets in connection with certain investments (e.g., futures), the Fund will, consistent with certain interpretive letters issued by the SEC, designate on its books and records cash or other liquid debt securities having a market value at least equal to the amount that would otherwise be required to be physically segregated. Investment Transactions and Investment Income: Investment transactions are recorded on the dates the transactions are entered into (the trade dates). Realized gains and losses on security transactions are deter-mined on the identified cost basis. Dividend income is recorded on the ex-dividend dates. Interest income is recognized on the accrual basis. The Fund amortizes all premiums and discounts on debt securities. Income and realized and unrealized gains and losses are allocated daily to each class based on its relative net assets. Dividends and Distributions: Dividends from net investment income are declared daily and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates. Income Taxes: It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Therefore, no federal income tax provision is required. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 19 Notes to Financial Statements (continued) Effective April 30, 2008, the Fund implemented Financial Accounting Standards Board ("FASB") Interpretation No. 48, "Accounting for Uncertainty in Income Taxes -- an interpretation of FASB Statement No. 109" ("FIN 48"). FIN 48 prescribes the minimum recognition threshold a tax position must meet in connection with accounting for uncertainties in income tax positions taken or expected to be taken by an entity, including investment companies, before being measured and recognized in the financial statements. The investment advisor has evaluated the application of FIN 48 to the Fund, and has determined that the adoption of FIN 48 does not have a material impact on the Fund's financial statements. The Fund files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The statute of limitations on the Fund's U.S. federal tax returns remains open for the years ended October 31, 2005 through October 31, 2007. The statutes of limitations on the Fund's state and local tax returns may remain open for an additional year depending upon the jurisdiction. Recent Accounting Pronouncements: In September 2006, Statement of Financial Accounting Standards No. 157, "Fair Value Measurements" ("FAS 157"), was issued and is effective for fiscal years beginning after November 15, 2007. FAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. The impact on the Fund's financial statement disclosures, if any, is currently being assessed. In addition, in February 2007, Statement of Financial Accounting Standards No. 159,"The Fair Value Option for Financial Assets and Financial Liabilities" ("FAS 159"), was issued and is effective for fiscal years beginning after November 15, 2007. FAS 159 permits entities to choose to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. FAS 159 also establishes presentation and disclosure requirements designed to facilitate comparisons between entities that choose different measurement attributes for similar types of assets and liabilities. The impact on the Fund's financial statement disclosures, if any, is currently being assessed. In March 2008, Statement of Financial Accounting Standards No. 161, "Disclosures about Derivative Instruments and Hedging Activities -- an amendment of FASB Statement No. 133" ("FAS 161"), was issued and is effective for fiscal years beginning after November 15, 2008. FAS 161 is intended to improve financial reporting for derivative instruments by requiring enhanced disclosure that enables investors to understand how and why an entity uses derivatives, how derivatives are accounted for, and how derivative instruments affect an entity's results of operations and financial position. The impact on each of the Fund's financial statement disclosures, if any, is currently being assessed. Other: Expenses directly related to the Fund or its classes are charged to that Fund or class. Other operating expenses shared by several funds are pro-rated among those funds on the basis of relative net assets or other appropriate methods. Other expenses of the Fund are allocated daily to each class based on its relative net assets. 2. Investment Advisory Agreement and Other Transactions with Affiliates The Fund entered into an Investment Advisory Agreement with BlackRock Advisors, LLC (the "Advisor"), an indirect, wholly owned subsidiary of BlackRock, Inc., to provide investment advisory and administration services. Merrill Lynch & Co., Inc. ("Merrill Lynch") and The PNC Financial Services Group, Inc. ("PNC") are principal owners of BlackRock, Inc. The Advisor is responsible for the management of the Fund's portfolio and provides the necessary personnel, facilities, equipment and certain other services necessary to the operation of the Fund. For such services, the Fund pays the Advisor a monthly fee at an annual rate of 0.55% of the average daily value of the Fund's net assets. The Advisor has contractually agreed to waive 0.05% of the average daily net assets of the Fund. For the period November 1, 2007 to May 31, 2008, the Advisor waived $56,435, which is included in fees waived by advisor on the Statements of Operations. For the period November 1, 2007 to May 31, 2008, the Fund reimbursed the Advisor $2,004 for certain accounting services, which is included in accounting services in the Statements of Operations. The Advisor has voluntarily agreed to waive its advisory fee by the amount of investment advisory fees the Fund pays to the Advisor indirectly through its investment in Merrill Lynch Institutional Tax-Exempt Fund. For the period November 1, 2007 to May 31, 2008, the Advisor waived $103, which is included in fees waived by advisor on the Statements of Operations. The Advisor has entered into a separate sub-advisory agreement with BlackRock Investment Management, LLC ("BIM"), an affiliate of the Advisor, under which the Advisor pays BIM for services it provides, a monthly fee that is a percentage of the investment advisory fee paid by the Fund to the Advisor. 20 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Notes to Financial Statements (continued) Pursuant to the terms of the custody agreement, custodian fees may be reduced by amounts calculated on uninvested cash balances ("custody credits"), which are on the Statements of Operations as fees paid indirectly. The Fund has also entered into separate Distribution Agreements and Distribution Plans with FAM Distributors, Inc. ("FAMD") and BlackRock Distributors, Inc. and its affiliates ("BDI") (collectively, the "Distributor"). FAMD is a wholly owned subsidiary of Merrill Lynch Group, Inc., and BDI is an affiliate of BlackRock, Inc. Pursuant to the Distribution Plans adopted by the Fund in accordance with Rule 12b-1 under the 1940 Act, the Fund pays the Distributor ongoing service and distribution fees. The fees are accrued daily and paid monthly at annual rates based upon the average daily net assets of the shares as follows: - -------------------------------------------------------------------------------- Service Distribution Fee Fee - -------------------------------------------------------------------------------- Investor A ........................................ 0.25% -- Investor A1 ....................................... 0.10% -- Investor B ........................................ 0.20% 0.10% Investor C ........................................ 0.25% 0.75% - -------------------------------------------------------------------------------- Pursuant to sub-agreements with each Distributor, broker-dealers, including Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S"), a wholly owned subsidiary of Merrill Lynch, and the Distributor provide shareholder servicing and distribution services to the Fund. The ongoing service and/or distribution fee compensates the Distributor and each broker-dealer for providing shareholder servicing and/or distribution-related services to Investor A, Investor A1, Investor B and Investor C shareholders. For the period November 1, 2007 to May 31, 2008, the Distributor earned underwriting discounts, direct commissions and dealer concessions on sales of the Fund's Investor A Shares, which totaled $14,097. For the period November 1, 2007 to May 31, 2008, affiliates received contingent deferred sales charges of $117 and $1,052 relating to transactions in Investor B and Investor C Shares, respectively. These amounts include payments to Hilliard Lyons, which was considered an affiliate for a portion of the period. Pursuant to written agreements, certain affiliates provide the Fund with sub-accounting, recordkeeping, sub-transfer agency and other administrative services with respect to sub-accounts they service. For these services, these affiliates receive an annual fee per shareholder account which will vary depending on share class. For the period November 1, 2007 to May 31, 2008, the Fund paid $42,980 in return for these services. PNC Global Investment Servicing (U.S.) Inc., formerly PFPC Inc., an indirect, wholly owned subsidiary of PNC and an affiliate of the Advisor, serves as transfer agent and dividend disbursing agent. Each class of the Fund bears the costs of transfer agent fees associated with such respective classes. Transfer agency fees borne by each class of the Fund are comprised of those fees charged for all shareholder communications including the mailing of shareholder reports, dividend and distribution notices, and proxy materials for shareholders meetings, as well as per account and per transaction fees related to servicing and maintenance of shareholder accounts, including the issuing, redeeming and transferring of shares of each class of the Fund, 12b-1 fee calculation, check writing, anti-money laundering services, and customer identification services. The Advisor maintains a call center, which is responsible for providing certain shareholder services to the Fund, such as responding to shareholder inquiries and processing transactions based upon instructions from shareholders with respect to the subscription and redemption of Fund shares. During the period November 1, 2007 to May 31, 2008, the Fund reimbursed the Advisor the following amounts for costs incurred running the call center, which are a component of the transfer agent fees in the accompanying Statements of Operations. - -------------------------------------------------------------------------------- Call Center Fees - -------------------------------------------------------------------------------- Institutional ................................................. $408 Investor A .................................................... $ 39 Investor A1 ................................................... $503 Investor B .................................................... $ 64 Investor C .................................................... $ 18 - -------------------------------------------------------------------------------- Certain officers and/or trustees of the Trust are officers and/or directors of BlackRock, Inc. or its affiliates. 3. Investments: Purchases and sales of investments, excluding short-term securities, for the period November 1, 2007 to May 31, 2008 were $58,110,303 and $58,695,422, respectively. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 21 Notes to Financial Statements (continued) 4. Beneficial Interest Transactions: There are an unlimited number of shares authorized for all classes. Transactions in beneficial interest for each class were as follows: Period November 1, 2007 to Year Ended May 31, 2008 October 31, 2007 ----------------------------- ----------------------------- Shares Dollar Amount Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Institutional - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold .................................................... 2,395,306 $ 24,477,654 4,555,700 $ 46,355,829 Shares issued to shareholders in reinvestment of dividends ..... 30,064 305,531 47,552 484,344 ----------------------------- ----------------------------- Total issued ................................................... 2,425,370 24,783,185 4,603,252 46,840,173 Shares redeemed ................................................ (3,024,414) (30,876,339) (2,446,319) (24,932,556) ----------------------------- ----------------------------- Net increase (decrease) ........................................ (599,044) $ (6,093,154) 2,156,933 $ 21,907,617 ============================= ============================= Year Ended October 31, 2006 ----------------------------- Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Institutional - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold ..................................................................................... 4,020,988 $ 40,960,524 Shares issued to shareholders in reinvestment of dividends and distributions .................... 99,237 1,011,100 ----------------------------- Total issued .................................................................................... 4,120,225 41,971,624 Shares redeemed ................................................................................. (4,163,299) (42,438,080) ----------------------------- Net decrease .................................................................................... (43,074) $ (466,456) ============================= Period November 1, 2007 to Year Ended May 31, 2008 October 31, 2007 ----------------------------- ----------------------------- Shares Dollar Amount Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor A - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold .................................................... 317,235 $ 3,251,586 259,672 $ 2,652,562 Shares issued to shareholders in reinvestment of dividends ..... 6,201 62,935 3,714 37,721 ----------------------------- ----------------------------- Total issued ................................................... 323,436 3,314,521 263,386 2,690,283 Shares redeemed ................................................ (46,078) (467,714) (4,847) (49,436) ----------------------------- ----------------------------- Net increase ................................................... 277,358 $ 2,846,807 258,539 $ 2,640,847 ============================= ============================= Period October 2, 2006+ to October 31, 2006 ----------------------------- Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor A - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold ..................................................................................... 15,604 $ 159,487 Shares redeemed ................................................................................. (7) (67) ----------------------------- Net increase .................................................................................... 15,597 $ 159,420 ============================= + Commencement of operations. 22 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Notes to Financial Statements (continued) Period November 1, 2007 to Year Ended May 31, 2008 October 31, 2007 ----------------------------- ----------------------------- Shares Dollar Amount Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor A1 - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold and the automatic conversion of shares ............. 67,918 $ 694,169 106,014 $ 1,079,829 Shares issued to shareholders in reinvestment of dividends ..... 71,985 731,542 133,046 1,354,908 ----------------------------- ----------------------------- Total issued ................................................... 139,903 1,425,711 239,060 2,434,737 Shares redeemed ................................................ (443,025) (4,521,733) (1,254,806) (12,806,788) ----------------------------- ----------------------------- Net decrease ................................................... (303,122) $ (3,096,022) (1,015,746) $(10,372,051) ============================= ============================= Year Ended October 31, 2006 ----------------------------- Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor A1 - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold ..................................................................................... 428,799 $ 4,375,953 Automatic conversion of shares .................................................................. 125,138 1,275,870 Shares issued to shareholders in reinvestment of dividends and distributions .................... 152,300 1,551,857 Shares issued resulting from conversion of Class C .............................................. 2,403,412 24,544,146 ----------------------------- Total issued .................................................................................... 3,109,649 31,747,826 Shares redeemed ................................................................................. (858,199) (8,752,391) ----------------------------- Net increase .................................................................................... 2,251,450 $ 22,995,435 ============================= Period November 1, 2007 to Year Ended May 31, 2008 October 31, 2007 ----------------------------- ----------------------------- Shares Dollar Amount Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor B - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold .................................................... 30,174 $ 307,941 8,995 $ 91,185 Shares issued to shareholders in reinvestment of dividends ..... 7,689 78,170 15,345 156,359 ----------------------------- ----------------------------- Total issued ................................................... 37,863 386,111 24,340 247,544 Shares redeemed and the automatic conversion of shares ......... (107,943) (1,103,637) (292,910) (2,986,145) ----------------------------- ----------------------------- Net decrease ................................................... (70,080) $ (717,526) (268,570) $ (2,738,601) ============================= ============================= Year Ended October 31, 2006 ----------------------------- Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor B - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold ..................................................................................... 51,287 $ 524,293 Shares issued to shareholders in reinvestment of dividends and distributions .................... 36,382 370,767 ----------------------------- Total issued .................................................................................... 87,669 895,060 ----------------------------- Automatic conversion of shares .................................................................. (125,110) (1,275,870) Shares redeemed ................................................................................. (460,278) (4,695,757) ----------------------------- Total redeemed .................................................................................. (585,388) (5,971,627) ----------------------------- Net decrease .................................................................................... (497,719) $ (5,076,567) ============================= BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 23 Notes to Financial Statements (continued) Period November 1, 2007 to Year Ended May 31, 2008 October 31, 2007 ----------------------------- ----------------------------- Shares Dollar Amount Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor C - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold .................................................... 269,846 $ 2,782,039 209,893 $ 2,140,147 Shares issued to shareholders in reinvestment of dividends ..... 7,672 43,108 3,333 33,849 ----------------------------- ----------------------------- Total issued ................................................... 277,518 2,825,147 213,226 2,173,996 Shares redeemed ................................................ (52,981) (541,035) (29,335) (297,025) ----------------------------- ----------------------------- Net increase ................................................... 224,537 $ 2,284,112 183,891 $ 1,876,971 ============================= ============================= Period October 2, 2006+ to October 31, 2006 ----------------------------- Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Investor C - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold ..................................................................................... 20,126 $ 205,721 Shares redeemed ................................................................................. (6) (69) ----------------------------- Net increase .................................................................................... 20,120 $ 205,652 ============================= + Commencement of operations. Period November 1, 2005 to August 25, 2006+ ----------------------------- Shares Dollar Amount - ----------------------------------------------------------------------------------------------------------------------------------- Class C - ----------------------------------------------------------------------------------------------------------------------------------- Shares sold ..................................................................................... 511,348 $ 5,215,735 Shares issued to shareholders in reinvestment of dividends and distributions .................... 69,597 708,846 ----------------------------- Total issued .................................................................................... 580,945 5,924,581 ----------------------------- Shares redeemed ................................................................................. (708,517) (7,244,280) Shares redeemed resulting from conversion to Investor A1 ........................................ (2,403,368) (24,544,146) ----------------------------- Total redeemed .................................................................................. (3,111,885) (31,788,426) ----------------------------- Net decrease .................................................................................... (2,530,940) $(25,863,845) ============================= + On August 25, 2006, Class C was converted to Class A (Investor A1). 24 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Notes to Financial Statements (concluded) 5. Short-Term Borrowings: The Fund, along with certain other funds managed by the Advisor and its affiliates, is a party to a $500,000,000 credit agreement with a group of lenders. The Fund may borrow under the credit agreement to fund shareholder redemptions and for other lawful purposes other than for leverage. The Fund may borrow up to the maximum amount allowable under the Fund's current prospectus and statement of additional information, subject to various other legal, regulatory or contractual limits. On November 21, 2007, the credit agreement was renewed for one year under substantially the same terms. The Fund pays a commitment fee of 0.06% per annum based on the Fund's pro rata share of the unused portion of the credit agreement, which is included in miscellaneous in the Statements of Operations. Amounts borrowed under the credit agreement bear interest at a rate equal to, at each fund's election, the federal funds rate plus 0.35% or a base rate as defined in the credit agreement. The Fund did not borrow under the credit agreement during the period November 1, 2007 to May 31, 2008. 6. Income Tax Information: Reclassification: Accounting principles generally accepted in the United States of America require that certain components of net assets be adjusted to reflect permanent differences between financial and tax reporting. Accordingly, during the current year, $5,815 has been reclassified between undistributed net investment income and accumulated net realized loss, as a result of permanent differences attributable to the classification of income and amortization methods on fixed income securities. This reclassification has no effect on net assets or net asset values per share. The tax character of distributions paid during the period November 1, 2007 to May 31, 2008 and years ended October 31, 2007 and October 31, 2006 was as follows: - -------------------------------------------------------------------------------- 5/31/2008 10/31/2007 10/31/06 - -------------------------------------------------------------------------------- Distributions paid from: Tax-exempt income ................. $4,235,395 $6,824,043 $ 6,463,395 Ordinary income ................... -- -- 77,571 Long-term capital gains ........... -- -- 3,674,581 ----------------------------------------- Total distributions ................. $4,235,395 $6,824,043 $10,215,547 ========================================= As of May 31, 2008, the components of accumulated losses on a tax basis were as follows: - ----------------------------------------------------------------------------- Undistributed tax-exempt net income .......................... $ 31,119 Undistributed ordinary income ................................ 4,911 Undistributed long-term net capital gains .................... -- ----------- Total undistributed net earnings ............................. 36,030 Capital loss carryforward .................................... (985,935)* Net unrealized losses ........................................ (449,454)** ----------- Total accumulated losses ..................................... $(1,399,359) =========== * On May 31, 2008, the Fund had a capital loss carryforward of $985,935, all of which expires in 2014. This amount will be available to offset future realized capital gains. ** The difference between book-basis and tax-basis net unrealized losses is attributable primarily to the difference between the book and tax treatment of residual interests in tender option bonds. 7. Concentration Risk: The Fund's investments are concentrated in certain states, which may be affected by adverse financial, social, environmental, economic, regulatory and political factors. Many municipalities insure repayment of their bonds, which reduces the risk of loss due to issuer default. The market value of these bonds may fluctuate for other reasons and there is no assurance that the insurer will meet its obligation. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 25 Report of Independent Registered Public Accounting Firm To the Shareholders and Board of Trustees of BlackRock Municipal Series Trust: We have audited the accompanying statement of assets and liabilities, including the schedule of investments, of BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust (the "Trust") as of May 31, 2008, and the related statements of operations for the period November 1, 2007 to May 31, 2008 and for the year ended October 31, 2007, the statements of changes in net assets for the period November 1, 2007 to May 31, 2008 and for each of the two years in the period ended October 31, 2007, and the financial highlights for each of the respective periods presented. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. The Trust is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of May 31, 2008, by correspondence with the custodian. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust as of May 31, 2008, the results of its operations for the period November 1, 2007 to May 31, 2008 and for the year ended October 31, 2007, the changes in its net assets for the period November 1, 2007 to May 31, 2008 and for each of the two years in the period ended October 31, 2007, and the financial highlights for each of the respective periods presented, in conformity with accounting principles generally accepted in the United States of America. Deloitte & Touche LLP Princeton, New Jersey July 28, 2008 Important Tax Information (Unaudited) All of the net investment income distributions paid by BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust during the taxable period ended May 31, 2008 qualify as tax-exempt interest dividends for federal income tax purposes. 26 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Officers and Trustees Number of Length of BlackRock- Position(s) Time Served Advised Funds Name, Address Held with as a Principal Occupation(s) and Portfolios and Year of Birth Fund Trustee 2 During Past Five Years Overseen Public Directorships ==================================================================================================================================== Non-Interested Trustees 1 - ------------------------------------------------------------------------------------------------------------------------------------ James H. Bodurtha Trustee Since 2007 Director, The China Business Group, Inc. 37 Funds None 40 East 52nd Street (consulting firm) since 1996 and formerly 104 Portfolios New York, NY 10022 Executive Vice President thereof from 1944 1996 to 2003; Chairman of the Board, Berkshire Holding Corporation since 1980. - ------------------------------------------------------------------------------------------------------------------------------------ Bruce R. Bond Trustee Since 2007 Formerly Trustee and Member of the 37 Funds None 40 East 52nd Street Governance Committee, State Street 104 Portfolios New York, NY 10022 Research Mutual Funds from 1997 to 2005; 1946 Formerly Board Member of Governance, Audit and Finance Committee, Avaya Inc. (computer equipment) from 2003 to 2007. - ------------------------------------------------------------------------------------------------------------------------------------ Donald W. Burton Trustee Since 2007 Managing General Partner, The Burton 37 Funds Knology, Inc. 40 East 52nd Street Partnership, LP (an investment 104 Portfolios (telecommunications); New York, NY 10022 partnership) since 1979; Managing General Capital Southwest 1944 Partner, The South Atlantic Venture Funds (financial) since 1983; Member of the Investment Advisory Council of the Florida State Board of Administration from 2001 to 2007. - ------------------------------------------------------------------------------------------------------------------------------------ Honorable Trustee Since 2007 Partner and Head of International 37 Funds UPS Corporation Stuart E. Eizenstat Practice, Covington and Burling (law 104 Portfolios (delivery service) 40 East 52nd Street firm) since 2001; International Advisory New York, NY 10022 Board Member, The Coca Cola Company since 1943 2002; Advisory Board Member BT Americas (telecommunications) since 2004; Member of the Board of Directors, Chicago Climate Exchange (environmental) since 2006; Member of the International Advisory Board GML (energy) since 2003. - ------------------------------------------------------------------------------------------------------------------------------------ Kenneth A. Froot Trustee Since 2007 Professor, Harvard University since 1992. 37 Funds None 40 East 52nd Street 104 Portfolios New York, NY 10022 1957 - ------------------------------------------------------------------------------------------------------------------------------------ Robert M. Hernandez Chairman of the Since 2007 Formerly Director, Vice Chairman and 37 Funds ACE Limited 40 East 52nd Street Board, Trustee Chief Financial Officer of USX 104 Portfolios (insurance company); New York, NY 10022 and Member of Corporation (energy and steel business) Eastman Chemical 1944 the Audit from 1991 to 2001. Company (chemical); Committee RTI International Metals, Inc. (metals); TYCO Electronics (electronics) - ------------------------------------------------------------------------------------------------------------------------------------ John F. O'Brien Trustee Since 2007 Trustee, Woods Hole Oceanographic 37 Funds Cabot Corporation 40 East 52nd Street Institute since 2003; Formerly Director, 104 Portfolios (chemicals); New York, NY 10022 Allmerica Financial Corporation from 1995 LKQ Corporation (auto 1943 to 2003; Formerly Director, ABIOMED from parts manufacturing); 1989 to 2006; Formerly Director, TJX Companies, Inc. Ameresco, Inc. (energy solutions company) (retailer) from 2006 to 2007. - ------------------------------------------------------------------------------------------------------------------------------------ BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 27 Officers and Trustees (continued) Number of Length of BlackRock- Position(s) Time Served Advised Funds Name, Address Held with as a Principal Occupation(s) and Portfolios and Year of Birth Fund Trustee 2 During Past Five Years Overseen Public Directorships ==================================================================================================================================== Non-Interested Trustees 1 (concluded) - ------------------------------------------------------------------------------------------------------------------------------------ Roberta Cooper Ramo Trustee Since 2007 Shareholder, Modrall, Sperling, Roehl, 37 Funds None 40 East 52nd Street Harris & Sisk, P.A. (law firm) since 104 Portfolios New York, NY 10022 1993; Chairman of the Board, Cooper's 1942 Inc. (retail) since 2000; Director of ECMC Group (service provider to students, schools and lenders) since 2001; President Elect, The American Law Institute (non-profit), 2007; Formerly President, American Bar Association from 1995 to 1996. - ------------------------------------------------------------------------------------------------------------------------------------ Jean Margo Reid Trustee Since 2004 Self-employed consultant since 2001; 37 Funds None 40 East 52nd Street Director and Secretary, SCB, Inc. 104 Portfolios New York, NY 10022 (holding company) since 1998; Director 1945 and Secretary, SCB Partners, Inc. (holding company) since 2000; Formerly Director, Covenant House (non-profit) from 2001 to 2004. - ------------------------------------------------------------------------------------------------------------------------------------ David H. Walsh Trustee Since 2007 Director, National Museum of Wildlife Art 37 Funds None 40 East 52nd Street since 2007; Director, Ruckleshaus 104 Portfolios New York, NY 10022 Institute and Haub School of Natural 1941 Resources at the University of Wyoming since 2006; Director, The American Museum of Fly Fishing since 1997; Formerly Consultant with Putnam Investments from 1993 to 2003; Formerly Director, The National Audubon Society from 1998 to 2005. - ------------------------------------------------------------------------------------------------------------------------------------ Fred G. Weiss Chairman of the Since 2007 Managing Director, FGW Associates 37 Funds Watson 40 East 52nd Street Audit Committee (consulting and investment company) since 104 Portfolios Pharmaceutical Inc. New York, NY 10022 and Trustee 1997; Director, Michael J. Fox Foundation 1941 for Parkinson's Research since 2000; Formerly Director of BTG International Plc (a global technology commercialization company) from 2001 to 2007. - ------------------------------------------------------------------------------------------------------------------------------------ Richard R. West Trustee and Since 1986 Dean Emeritus, New York University's 37 Funds Bowne & Co., Inc. 40 East 52nd Street Member of the Leonard N. Stern School of Business 104 Portfolios (financial printers); New York, NY 10022 Audit Committee Administration since 1995. Vornado Realty Trust 1938 (real estate company); Alexander's Inc. (real estate company) ------------------------------------------------------------------------------------------------------------- 1 Trustees serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. 2 Following the combination of Merrill Lynch Investment Managers, L.P. ("MLIM") and BlackRock, Inc. ("BlackRock") in September 2006, the various legacy MLIM and legacy BlackRock Fund boards were realigned and consolidated into three new Fund boards in 2007. As a result, although the chart shows certain trustees as joining the Fund's board in 2007, each trustee first became a member of the board of trustees of other legacy MLIM or legacy BlackRock Funds as follows: James H. Bodurtha since 1995; Bruce R. Bond since 2005; Donald W. Burton since 2002; Stuart E. Eizenstat since 2001; Kenneth A. Froot since 2005; Robert M. Hernandez since 1996; John F. O'Brien since 2004; Roberta Cooper Ramo since 2000; Jean Margo Reid since 2004; David H. Walsh since 2003; Fred G. Weiss since 1998; and Richard R. West since 1978. 28 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Officers and Trustees (continued) Number of Length of BlackRock- Position(s) Time Served Advised Funds Name, Address Held with as a Principal Occupation(s) and Portfolios and Year of Birth Fund Trustee During Past Five Years Overseen Public Directorships ==================================================================================================================================== Interested Trustees 1 - ------------------------------------------------------------------------------------------------------------------------------------ Richard S. Davis Fund President Since 2007 Managing Director, BlackRock, Inc. since 185 Funds None 40 East 52nd Street and Trustee 2005; Formerly Chief Executive Officer, 295 Portfolios New York, NY 10022 State Street Research & Management 1945 Company from 2000 to 2005; Formerly Chairman of the Board of Trustees, State Street Research Mutual Funds from 2000 to 2005; Formerly Chairman, SSR Realty from 2000 to 2004. - ------------------------------------------------------------------------------------------------------------------------------------ Laurence D. Fink Trustee Since 2007 Chairman and Chief Executive Officer of 37 Funds None 40 East 52nd Street BlackRock, Inc. since its formation in 104 Portfolios New York, NY 10022 1998 and of BlackRock, Inc.'s predecessor 1952 entities since 1988 and Chairman of the Executive and Management Committees; Formerly Managing Director, The First Boston Corporation, Member of its Management Committee, Co-head of its Taxable Fixed Income Division and Head of its Mortgage and Real Estate Products Group; Chairman of the Board of several of BlackRock's alternative investment vehicles; Director of several of BlackRock's offshore funds; Member of the Board of Trustees of New York University, Chair of the Financial Affairs Committee and a member of the Executive Committee, the Ad Hoc Committee on Board Governance, and the Committee on Trustees; Co-Chairman of the NYU Hospitals Center Board of Trustees, Chairman of the Development/Trustee Stewardship Committee and Chairman of the Finance Committee; Trustee, The Boys' Club of New York. - ------------------------------------------------------------------------------------------------------------------------------------ Henry Gabbay Trustee Since 2007 Consultant, BlackRock, Inc. since 2007; 184 Funds None 40 East 52nd Street Formerly Managing Director, BlackRock, 294 Portfolios New York, NY 10022 Inc. from 1989 to 2007; Formerly Chief 1947 Administrative Officer, BlackRock Advisors, LLC from 1998 to 2007; Formerly President of BlackRock Funds and BlackRock Bond Allocation Target Shares from 2005 to 2007 and Treasurer of certain closed-end Funds in the BlackRock fund complex from 1989 to 2006. ------------------------------------------------------------------------------------------------------------- 1 Messrs. Davis, Fink and Gabbay are all "interested persons," as defined in the Investment Company Act of 1940, of the Fund based on their positions with BlackRock, Inc. and its affiliates. Trustees serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 29 Officers and Trustees (concluded) Position(s) Name, Address Held with Length of and Year of Birth the Fund Time Served Principal Occupation(s) During Past Five Years ==================================================================================================================================== Fund Officers 1 - ------------------------------------------------------------------------------------------------------------------------------------ Donald C. Burke Chief Executive Since 2007 Managing Director of BlackRock, Inc. since 2006; Formerly Managing Director of 40 East 52nd Street Officer Merrill Lynch Investment Managers, L.P. ("MLIM") and Fund Asset Management, New York, NY 10022 L.P. ("FAM") in 2006; First Vice President thereof from 1997 to 2005; Treasurer 1960 thereof from 1999 to 2006 and Vice President thereof from 1990 to 1997. - ------------------------------------------------------------------------------------------------------------------------------------ Anne F. Ackerley Vice President Since 2007 Managing Director of BlackRock, Inc. since 2000; Chief Operating Officer of 40 East 52nd Street BlackRock's U.S. Retail Group since 2006; Head of BlackRock's Mutual Fund Group New York, NY 10022 from 2000 to 2006; Merrill Lynch & Co., Inc. from 1984 to 1986 and from 1988 to 1962 2000, most recently as First Vice President and Operating Officer of the Mergers and Acquisitions Group. - ------------------------------------------------------------------------------------------------------------------------------------ Neal J. Andrews Chief Financial Since 2007 Managing Director of BlackRock, Inc. since 2006; Formerly Senior Vice President 40 East 52nd Street Officer and Line of Business Head of Fund Accounting and Administration at PFPC Inc. New York, NY 10022 from 1992 to 2006. 1966 - ------------------------------------------------------------------------------------------------------------------------------------ Jay M. Fife Treasurer Since 2007 Managing Director of BlackRock, Inc. since 2007 and Director in 2006; Formerly 40 East 52nd Street Assistant Treasurer of the MLIM/FAM-advised Funds from 2005 to 2006; Director New York, NY 10022 of MLIM Fund Services Group from 2001 to 2006. 1970 - ------------------------------------------------------------------------------------------------------------------------------------ Brian P. Kindelan Chief Since 2007 Chief Compliance Officer of the BlackRock-advised Funds since 2007; Anti-Money 40 East 52nd Street Compliance Laundering Officer of the BlackRock-advised Funds since 2007; Managing Director New York, NY 10022 Officer and Senior Counsel of BlackRock, Inc. since 2005; Director and Senior Counsel 1959 of the Fund of BlackRock Advisors, Inc. from 2001 to 2004 and Vice President and Senior Counsel thereof from 1998 to 2000; Formerly Senior Counsel of The PNC Bank Corp. from 1995 to 1998. - ------------------------------------------------------------------------------------------------------------------------------------ Howard Surloff Secretary Since 2007 Managing Director of BlackRock, Inc. and General Counsel of U.S. Funds at 40 East 52nd Street BlackRock, Inc. since 2006; Formerly General Counsel (U.S.) of Goldman Sachs New York, NY 10022 Asset Management, L.P. from 1993 to 2006. 1965 ------------------------------------------------------------------------------------------------------------- 1 Officers of the Fund serve at the pleasure of the Board of Trustees. ------------------------------------------------------------------------------------------------------------- Further information about the Fund's Officers and Trustees is available in the Fund's Statement of Additional Information, which can be obtained without charge by calling (800) 441-7762. - ------------------------------------------------------------------------------------------------------------------------------------ Custodian State Street Bank and Trust Company Boston, MA 02101 Transfer Agent PNC Global Investment Servicing (U.S.) Inc. Wilmington, DE 19809 Accounting Agent State Street Bank and Trust Company Princeton, NJ 08540 Independent Registered Public Accounting Firm Deloitte & Touche LLP Princeton, NJ 08540 Legal Counsel Willkie Farr & Gallagher LLP New York, NY 10019 30 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Additional Information BlackRock Privacy Principles BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, "Clients") and to safeguarding their non-public personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties. If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations. BlackRock obtains or verifies personal non-public information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our websites. BlackRock does not sell or disclose to non-affiliated third parties any non-public personal information about its Clients, except as permitted by law or as is necessary to respond to regulatory requests or to service Client accounts. These non-affiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose. We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to non-public personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the non-public personal information of its Clients, including procedures relating to the proper storage and disposal of such information. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 31 Additional Information (continued) Availability of Additional Information (concluded) Electronic copies of most financial reports and prospectuses are available on the Fund's website or shareholders can sign up for e-mail notifications of quarterly statements, annual and semi-annual reports and prospectuses by enrolling in the Fund's electronic delivery program. To enroll: Shareholders Who Hold Accounts with Investment Advisors, Banks or Brokerages: Please contact your financial advisor. Please note that not all investment advisors, banks or brokerages may offer this service. Shareholders Who Hold Accounts Directly with BlackRock: 1) Access the BlackRock website at http://www.blackrock.com/edelivery 2) Click on the applicable link and follow the steps to sign up 3) Log into your account The Fund will mail only one copy of shareholder documents, including prospectuses, annual and semi-annual reports and proxy statements, to shareholders with multiple accounts at the same address. This practice is commonly called "householding" and it is intended to reduce expenses and eliminate duplicate mailings of shareholder documents. Mailings of your shareholder documents may be householded indefinitely unless you instruct us otherwise. If you do not want the mailing of these documents to be combined with those for other members of your household, please contact the Fund at (800) 441-7762. Availability of Proxy Voting Policies and Procedures A description of the policies and procedures that the Fund uses to determine how to vote proxies relating to portfolio securities is available (1) without charge, upon request, by calling toll-free (800) 441-7762; (2) at www.blackrock.com; and (3) on the Securities and Exchange Commission's (the "SEC") website at http://www.sec.gov. Availability of Proxy Voting Record Information about how the Fund votes proxies relating to securities held in the Fund's portfolio during the most recent 12-month period ended June 30 is available upon request and without charge (1) at www.blackrock.com or by calling (800) 441-7762 and (2) on the SEC's website at http://www.sec.gov. Availability of Quarterly Portfolio Schedule The Fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. The Fund's Forms N-Q are available on the SEC's website at http://www.sec.gov and may also be reviewed and copied at the SEC's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling (800) SEC-0330. The Fund's Forms N-Q may also be obtained upon request and without charge by calling (800) 441-7762. 32 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 Additional Information (concluded) Shareholder Privileges Account Information Call us at (800) 441-7762 from 8:00 AM to 6:00 PM EST to get information about your account balances, recent transactions and share prices. You can also reach us on the Web at www.blackrock.com/funds. Automatic Investment Plans Investor Class shareholders who want to invest regularly can arrange to have $50 or more automatically deducted from their checking or savings account and invested in any of the BlackRock funds. Systematic Withdrawal Plans Investor Class shareholders can establish a systematic withdrawal plan and receive periodic payments of $50 or more from their BlackRock funds, as long as their account is at least $10,000. Retirement Plans Shareholders may make investments in conjunction with Traditional, Rollover, Roth, Coverdell, Simple IRAs, SEP IRAs and 403(b) Plans. BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 33 A World-Class Mutual Fund Family BlackRock offers a diverse lineup of open-end mutual funds crossing all investment styles and managed by experts in equity, fixed income and tax-exempt investing. Equity Funds BlackRock All-Cap Global Resources Portfolio BlackRock Asset Allocation Portfolio+ BlackRock Aurora Portfolio BlackRock Balanced Capital Fund+ BlackRock Basic Value Fund BlackRock Capital Appreciation Portfolio BlackRock Equity Dividend Fund BlackRock EuroFund BlackRock Focus Growth Fund BlackRock Focus Value Fund BlackRock Fundamental Growth Fund BlackRock Global Allocation Fund+ BlackRock Global Dynamic Equity Fund BlackRock Global Emerging Markets Fund BlackRock Global Financial Services Fund BlackRock Global Growth Fund BlackRock Global Opportunities Portfolio BlackRock Global Resources Portfolio BlackRock Global Science & Technology Opportunities Portfolio BlackRock Global SmallCap Fund BlackRock Health Sciences Opportunities Portfolio* BlackRock Healthcare Fund BlackRock Index Equity Portfolio* BlackRock International Fund BlackRock International Index Fund BlackRock International Opportunities Portfolio BlackRock International Value Fund BlackRock Large Cap Core Fund BlackRock Large Cap Growth Fund BlackRock Large Cap Value Fund BlackRock Latin America Fund BlackRock Mid-Cap Growth Equity Portfolio BlackRock Mid-Cap Value Equity Portfolio BlackRock Mid Cap Value Opportunities Fund BlackRock Natural Resources Trust BlackRock Pacific Fund BlackRock Small Cap Core Equity Portfolio BlackRock Small Cap Growth Equity Portfolio BlackRock Small Cap Growth Fund II BlackRock Small Cap Index Fund BlackRock Small Cap Value Equity Portfolio* BlackRock Small/Mid-Cap Growth Portfolio BlackRock S&P 500 Index Fund BlackRock Technology Fund BlackRock U.S. Opportunities Portfolio BlackRock Utilities and Telecommunications Fund BlackRock Value Opportunities Fund Fixed Income Funds BlackRock Commodity Strategies Fund BlackRock Emerging Market Debt Portfolio BlackRock Enhanced Income Portfolio BlackRock GNMA Portfolio BlackRock Government Income Portfolio BlackRock High Income Fund BlackRock High Yield Bond Portfolio BlackRock Income Portfolio BlackRock Income Builder Portfolio BlackRock Inflation Protected Bond Portfolio BlackRock Intermediate Bond Portfolio II BlackRock Intermediate Government Bond Portfolio BlackRock International Bond Portfolio BlackRock Long Duration Bond Portfolio BlackRock Low Duration Bond Portfolio BlackRock Managed Income Portfolio BlackRock Short-Term Bond Fund BlackRock Strategic Income Portfolio BlackRock Total Return Fund BlackRock Total Return Portfolio II BlackRock World Income Fund Municipal Bond Funds BlackRock AMT-Free Municipal Bond Portfolio BlackRock California Insured Municipal Bond Fund BlackRock Delaware Municipal Bond Portfolio BlackRock Florida Municipal Bond Fund BlackRock High Yield Municipal Fund BlackRock Intermediate Municipal Fund BlackRock Kentucky Municipal Bond Portfolio BlackRock Municipal Insured Fund BlackRock National Municipal Fund BlackRock New Jersey Municipal Bond Fund BlackRock New York Municipal Bond Fund BlackRock Ohio Municipal Bond Portfolio BlackRock Pennsylvania Municipal Bond Fund BlackRock Short-Term Municipal Fund Target Risk & Target Date Funds BlackRock Prepared Portfolios Conservative Prepared Portfolio Moderate Prepared Portfolio Growth Prepared Portfolio Aggressive Growth Prepared Portfolio BlackRock Lifecycle Prepared Portfolios Prepared Portfolio 2010 Prepared Portfolio 2015 Prepared Portfolio 2020 Prepared Portfolio 2025 Prepared Portfolio 2030 Prepared Portfolio 2035 Prepared Portfolio 2040 Prepared Portfolio 2045 Prepared Portfolio 2050 * See the prospectus for information on specific limitations on investments in the fund. + Mixed asset fund. BlackRock mutual funds are distributed by BlackRock Distributors, Inc. and certain funds are also distributed by FAM Distributors, Inc. You should consider the investment objectives, risks, charges and expenses of the funds under consideration carefully before investing. Each fund's prospectus contains this and other information and is available at www.blackrock.com or by calling (800) 882-0052 or from your financial advisor. The prospectus should be read carefully before investing. 34 BLACKROCK INTERMEDIATE MUNICIPAL FUND MAY 31, 2008 This report is not authorized for use as an offer of sale or a solicitation of an offer to buy shares of the Fund unless accompanied or preceded by the Fund's current prospectus. Past performance results shown in this report should not be considered a representation of future performance. Investment returns and principal value of shares will fluctuate so that shares, when redeemed, may be worth more or less than their original cost. Statements and other information herein are as dated and are subject to change. BlackRock Intermediate Municipal Fund Of BlackRock Municipal Series Trust 100 Bellevue Parkway Wilmington, DE 19809 BLACKROCK #10437-5/08 Item 2 - Code of Ethics - The registrant (or the "Fund") has adopted a code of ethics, as of the end of the period covered by this report, applicable to the registrant's principal executive officer, principal financial officer and principal accounting officer, or persons performing similar functions. During the period covered by this report, there have been no amendments to or waivers granted under the code of ethics. A copy of the code of ethics is available without charge at www.blackrock.com. Item 3 - Audit Committee Financial Expert - The registrant's board of directors or trustees, as applicable (the "board of directors") has determined that (i) the registrant has the following audit committee financial experts serving on its audit committee and (ii) each audit committee financial expert is independent: Ronald W. Forbes (term ended, effective November 1, 2007) Robert M. Hernandez (term began, effective November 1, 2007) Fred G. Weiss (term began, effective November 1, 2007) Richard R. West Under applicable securities laws, a person determined to be an audit committee financial expert will not be deemed an "expert" for any purpose, including without limitation for the purposes of Section 11 of the Securities Act of 1933, as a result of being designated or identified as an audit committee financial expert. The designation or identification as an audit committee financial expert does not impose on such person any duties, obligations, or liabilities greater than the duties, obligations, and liabilities imposed on such person as a member of the audit committee and board of directors in the absence of such designation or identification. Item 4 - Principal Accountant Fees and Services - ----------------------------------------------------------------------------------------------------------------------------------- (a) Audit Fees (b) Audit-Related Fees(1) (c) Tax Fees(2) (d) All Other Fees(3) - ----------------------------------------------------------------------------------------------------------------------------------- Current Previous Current Previous Current Previous Current Previous Fiscal Year Fiscal Fiscal Year Fiscal Fiscal Year Fiscal Fiscal Year Fiscal Entity Name End Year End End Year End End Year End End Year End - ----------------------------------------------------------------------------------------------------------------------------------- BlackRock $27,900 $51,350 $0 $0 $6,100 $6,100 $1,049 $1,042 Intermediate Municipal Fund of BlackRock Municipal Series Trust - ----------------------------------------------------------------------------------------------------------------------------------- 1 The nature of the services include assurance and related services reasonably related to the performance of the audit of financial statements not included in Audit Fees. 2 The nature of the services include tax compliance, tax advice and tax planning. 3 The nature of the services include a review of compliance procedures and attestation thereto. (e)(1) Audit Committee Pre-Approval Policies and Procedures: The registrant's audit committee (the "Committee") has adopted policies and procedures with regard to the pre-approval of services. Audit, audit-related and tax compliance services provided to the registrant on an annual basis require specific pre-approval by the Committee. The Committee also must approve other non-audit services provided to the registrant and those non-audit services provided to the registrant's affiliated service providers that relate directly to the operations and the financial reporting of the registrant. Certain of these non-audit services that the Committee believes are a) consistent with the SEC's auditor independence rules and b) routine and recurring services that will not impair the independence of the independent accountants may be approved by the Committee without consideration on a specific case-by-case basis ("general pre-approval"). The term of any general pre-approval is 12 months from the date of the pre-approval, unless the Committee provides for a different period. Tax or other non-audit services provided to the registrant which have a direct impact on the operation or financial reporting of the registrant will only be deemed pre-approved provided that any individual project does not exceed $10,000 attributable to the registrant or $50,000 for all of the registrants the Committee oversees. For this purpose, multiple projects will be aggregated to determine if they exceed the previously mentioned cost levels. Any proposed services exceeding the pre-approved cost levels will require specific pre-approval by the Committee, as will any other services not subject to general pre-approval (e.g., unanticipated but permissible services). The Committee is informed of each service approved subject to general pre-approval at the next regularly scheduled in-person board meeting. At this meeting, an analysis of such services is presented to the Committee for ratification. The Committee may delegate to one or more of its members the authority to approve the provision of and fees for any specific engagement of permitted non-audit services, including services exceeding pre-approved cost levels. (e)(2) None of the services described in each of Items 4(b) through (d) were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. (f) Not Applicable (g) Affiliates' Aggregate Non-Audit Fees: -------------------------------------------------------------------- Current Fiscal Previous Fiscal Entity Name Year End Year End -------------------------------------------------------------------- BlackRock Intermediate Municipal $294,649 $713,975 Fund of BlackRock Municipal Series Trust -------------------------------------------------------------------- (h) The registrant's audit committee has considered and determined that the provision of non-audit services that were rendered to the registrant's investment adviser (not including any non-affiliated sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by the registrant's investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Regulation S-X Rule 2-01(c)(7)(ii) - $287,500, 0% Item 5 - Audit Committee of Listed Registrants - Not Applicable Item 6 - Investments (a) The registrant's Schedule of Investments is included as part of the Report to Stockholders filed under Item 1 of this form. (b) Not Applicable due to no such divestments during the semi-annual period covered since the previous Form N-CSR filing. Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable Item 8 - Portfolio Managers of Closed-End Management Investment Companies - Not Applicable Item 9 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers - Not Applicable Item 10 - Submission of Matters to a Vote of Security Holders - The registrant's Nominating and Governance Committee will consider nominees to the board of directors recommended by shareholders when a vacancy becomes available. Shareholders who wish to recommend a nominee should send nominations which include biographical information and set forth the qualifications of the proposed nominee to the registrant's Secretary. There have been no material changes to these procedures. Item 11 - Controls and Procedures 11(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 15d-15(b) under the Securities Exchange Act of 1934, as amended. 11(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 second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 12 - Exhibits attached hereto 12(a)(1) - Code of Ethics - See Item 2 12(a)(2) - Certifications - Attached hereto 12(a)(3) - Not Applicable 12(b) - 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 Intermediate Municipal Fund of BlackRock Municipal Series Trust By: /s/ Donald C. Burke ----------------------------------- Donald C. Burke Chief Executive Officer of BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust Date: July 18, 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 Intermediate Municipal Fund of BlackRock Municipal Series Trust Date: July 18, 2008 By: /s/ Neal J. Andrews ----------------------------------- Neal J. Andrews Chief Financial Officer (principal financial officer) of BlackRock Intermediate Municipal Fund of BlackRock Municipal Series Trust Date: July 18, 2008