UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSRS CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-4375 Name of Fund: Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series Trust Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Terry K. Glenn, President, Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State 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: (609) 282-2800 Date of fiscal year end: 07/31/04 Date of reporting period: 08/01/03 - 01/31/04 Item 1 - Report to Shareholders [LOGO] Merrill Lynch Investment Managers www.mlim.ml.com Merrill Lynch Pennsylvania Municipal Bond Fund Semi-Annual Report January 31, 2004 [LOGO] Merrill Lynch Investment Managers Merrill Lynch Pennsylvania Municipal Bond Fund Officers and Trustees Terry K. Glenn, President and Trustee James H. Bodurtha, Trustee Joe Grills, Trustee Herbert I. London, Trustee Andre F. Perold, Trustee Roberta Cooper Ramo, Trustee Robert S. Salomon, Jr., Trustee Stephen B. Swensrud, Trustee Kenneth A. Jacob, Senior Vice President John M. Loffredo, Senior Vice President William R. Bock, Vice President Donald C. Burke, Vice President and Treasurer Brian D. Stewart, Secretary Custodian State Street Bank and Trust Company P.O. Box 351 Boston, MA 02101 Transfer Agent Financial Data Services, Inc. 4800 Deer Lake Drive East Jacksonville, FL 32246-6484 800-637-3863 2 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 A Letter From the President Dear Shareholder In my 35 years in the asset management business, 2003 was among the more memorable. The year, which opened with geopolitical turmoil, unrelenting economic uncertainty and a dismal continuation of a three-year equity market slump, vigorously reversed course in the months that followed. As we entered 2004, the equity markets maintained their positive momentum from year-end 2003. For the six-month and 12-month periods ended January 31, 2004, the Standard & Poor's (S&P) 500 Index returned +15.23% and +34.57%, respectively. In the fixed income markets, investors willing to accept the greatest risk were rewarded the most. This trend held true in the municipal bond market as well, where high yield issues generally outperformed investment grade bonds. For the six-month and 12-month periods ended January 31, 2004, the Lehman Brothers Non-Investment Grade Index of municipal bonds posted respective returns of +9.99% and +15.33%. The major signposts indicate that we are seeing a shift from economic growth fueled primarily by fiscal and monetary stimulus to a broader-based, self-sustaining economic expansion. Gross domestic product growth, which peaked at an annualized rate of 8.2% in the third quarter of 2003, is estimated at a more sustainable 4% in the fourth quarter. That level of growth is expected to repeat itself in the first quarter of 2004. For its part, the Federal Reserve Board has reiterated its willingness to keep short-term interest rates at current low levels to ensure the economy's strength. Accompanying the increase in economic activity was an improvement in corporate earnings. By the end of January, 298 of the S&P 500 companies had reported their fourth-quarter results, and 67.4% of those exceeded expectations. In the meantime, the American consumer, who continued to spend despite the faltering economy, may get further incentive from another round of Federal tax refunds in 2004. At Merrill Lynch Investment Managers, we believe the events and efforts of 2003 leave us with a much stronger economy and recent optimism suggests it is time for investors to consider what can go right in 2004. We encourage you to revisit your portfolio and your asset allocation strategy to ensure you are well positioned to take advantage of the opportunities that lie ahead. We thank you for trusting Merrill Lynch Investment Managers with your investment assets, and we look forward to serving you in the months and years ahead. Sincerely, /s/ Terry K. Glenn Terry K. Glenn President and Trustee MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 3 [LOGO] Merrill Lynch Investment Managers A Discussion With Your Fund's Portfolio Manager We maintained a conservative stance throughout the period and focused on enhancing yield and preserving the Fund's net asset value in a highly volatile interest rate environment. Discuss the recent market environment relative to municipal bonds. Over the past six months, long-term fixed income interest rates generally declined as the U.S. economy gained strength. Gross domestic product growth expanded at an annualized rate of 8.2% in the third quarter of 2003, with fourth-quarter growth estimated at 4.0%. These figures were well above the 1.4% rate of growth registered in the first quarter of 2003. Improving economic conditions benefited equity markets, as the Standard & Poor's 500 Index, a widely recognized measure of U.S. stock market performance, returned +15.23% for the six months ended January 31, 2004. Despite the strong growth, the Federal Reserve Board seemed apt to leave short-term interest rates at their current low levels, citing subdued employment growth and the absence of material inflationary pressures. While short-term interest rates remained at historic lows, long-term interest rates generally declined over the past six months. At the end of January 2004, long-term U.S. Treasury bond yields stood at 4.96%, having dropped 40 basis points (.40%) from six months earlier. In the tax-exempt bond market, long-term revenue bond yields also fell 40 basis points to 5.02%, as measured by the Bond Buyer Revenue Bond Index. Both 30-year and 10-year Aaa-rated municipal issues -- the highest rated -- saw their yields decrease approximately 50 basis points during the six-month period ended January 31, 2004, as reported by Municipal Market Data. Although improving U.S. equity valuations took some attention away from fixed income markets, overall demand for tax-exempt products remained positive. With tax-exempt money market rates at or below 1% and low nominal municipal bond yields in general, many investors have moved increasingly further out on the municipal yield curve to generate the desired level of tax-exempt income. This gravitation toward longer maturities helped support the strong demand and performance exhibited by tax-exempt products during the period. The municipal bond market's performance also benefited from a notable improvement in supply/demand dynamics. In recent months, the pace of new municipal bond issuance has greatly declined. For the 12 months ended January 31, 2004, municipalities issued more than $375 billion in new securities, an increase of approximately 5% compared to last year's issuance. Clearly, municipalities viewed the historically low interest rates over the past year as an opportunity to finance existing infrastructure needs and to refinance outstanding, higher-coupon debt. Over the past six months, however, new issuance fell 11.5% compared to the same period a year earlier. The decline was even more pronounced in the last three months, with a decrease of more than 13% compared to the same three months last year. This decline in supply helped strengthen the municipal market's positive technical position and enhanced recent performance. New-issue supply is expected to remain manageable in early 2004 and should help support the tax-exempt bond market's position as an attractive fixed income investment alternative. Describe conditions in the Commonwealth of Pennsylvania. Despite recession and slow growth in the past few years, the Commonwealth of Pennsylvania managed to protect its Aa2/AA/AA credit ratings from the national rating agencies. This is attributed to its conservative budgeting practices, maintenance of a relatively low debt burden and a more service-diversified economy. In fiscal year 2001-2002, prolonged weakness resulted in the full use of the commonwealth's rainy-day reserves to balance the budget. In fiscal year 2002-2003, a combination of tax increases (cigarettes), one-time measures and appropriation cuts resulted in a balanced budget. The tightly balanced 2003-2004 budget, passed five months late in December 2003, includes increases in personal income taxes (from 2.8% to 3.1%) and beer taxes. Under Governor Rendell's plan, Pennsylvania would assume a larger portion of school funding to allow for local property-tax relief. The proposed fiscal 2004-2005 budget has been presented to the legislature and calls for a 4.1% increase over the prior year's spending plan, focused largely on quality-of-life issues with the goal of attracting more employers and residents to the Keystone State. 4 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 How did the Fund perform during the period in light of the existing market conditions? For the six-month period ended January 31, 2004, the Fund's Class A, Class B, Class C and Class I Shares had total returns of +5.86%, +5.75%, +5.69% and +6.02%, respectively. (Fund results shown do not reflect sales charges and would be lower if sales charges were included. Complete performance information can be found on pages 6 and 7 of this report to shareholders.) For the most part, Fund returns exceeded the +5.73% return of the unmanaged benchmark Lehman Brothers Municipal Bond Index for the same period. The Fund outperformed its comparable Lipper category of Pennsylvania Municipal Debt Funds, which had an average return of +5.27% for the six-month period. (Funds in this Lipper category limit their investment to those securities exempt from taxation in the Commonwealth of Pennsylvania.) During the period, we continued to focus on enhancing the Fund's dividend yield and reducing net asset value volatility in a highly variable interest rate environment. This focus on generating income for our shareholders was apparent in the Fund's yield, which was above that of many of its peers for the period. What changes were made to the portfolio during the period? During the period, we collapsed an existing non-callable derivative position in order to establish a new derivative position that we believed would generate greater income for our shareholders. The new position consisted of higher-yielding, less price-sensitive callable bonds. In the past six months, several of the Fund's higher-coupon housing bonds were called. Until these positions can be replaced with bonds that we believe possess attractive risk/reward characteristics, we expect that this may adversely affect the Fund's yield. Unfortunately, the majority of new Pennsylvania issues that came to market during the period were intermediate maturities and lower coupons. How would you characterize the portfolio's position at the close of the period? We expect that the municipal market will continue to experience periods of volatility, with interest rates moving to higher levels some time in the first half of 2004. This is based on our view that economic growth will be favorable, and economic data should make this clear to the market in the months ahead. With that said, we believe that the municipal market will outperform the Treasury market, but with tepid returns. The growing appetite for tax-exempt income on the part of property and casualty insurance companies and individual investors should help to cushion the municipal market from the impact of rising interest rates. Under these conditions, we feel that maintaining a defensive market position by focusing on premium-coupon bonds in the 20-year - 25-year maturity range is a prudent investment strategy that should moderate the downside potential to the Fund's net asset value in a rising interest rate environment. William R. Bock Vice President and Portfolio Manager February 12, 2004 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 5 [LOGO] Merrill Lynch Investment Managers Performance Data About Fund Performance Effective April 14, 2003, Class A Shares were redesignated Class I Shares and Class D Shares were redesignated Class A Shares. Investors are able to purchase shares of the Fund through multiple pricing alternatives: o Class A Shares incur a maximum initial sales charge of 4% and an account maintenance fee of 0.10% (but no distribution fee). o Class B Shares are subject to a maximum contingent deferred sales charge of 4%, declining to 0% after six years. All Class B Shares purchased prior to December 1, 2002 will maintain the four-year schedule. In addition, Class B Shares are subject to a distribution fee of 0.25% and an account maintenance fee of 0.25%. These shares automatically convert to Class A Shares after approximately ten years. (There is no initial sales charge for automatic share conversions.) o Class C Shares are subject to a distribution fee of 0.35% and an account maintenance fee of 0.25%. In addition, Class C Shares are subject to a 1% contingent deferred sales charge if redeemed within one year of purchase. o Class I Shares incur a maximum initial sales charge (front-end load) of 4% and bear no ongoing distribution or account maintenance fees. Class I Shares are available only to eligible investors. None of the past results shown should be considered a representation of future performance. Current performance may be lower or higher than the performance data quoted. Refer to www.mlim.ml.com to obtain more current performance information. 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 each of the following tables assume reinvestment of all dividends and capital gains distributions at net asset value on the payable date. 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 account maintenance, distribution and transfer agency fees applicable to each class, which are deducted from the income available to be paid to shareholders. Recent Performance Results 10-Year/ 6-Month 12-Month Since Inception Standardized As of January 31, 2004 Total Return Total Return Total Return 30-Day Yield ======================================================================================================================= ML Pennsylvania Municipal Bond Fund Class A Shares* +5.86% +7.01% +77.67% 3.47% - ----------------------------------------------------------------------------------------------------------------------- ML Pennsylvania Municipal Bond Fund Class B Shares* +5.75 +6.58 +60.83 3.20 - ----------------------------------------------------------------------------------------------------------------------- ML Pennsylvania Municipal Bond Fund Class C Shares* +5.69 +6.48 +69.34 3.10 - ----------------------------------------------------------------------------------------------------------------------- ML Pennsylvania Municipal Bond Fund Class I Shares* +6.02 +7.11 +69.19 3.56 - ----------------------------------------------------------------------------------------------------------------------- Lehman Brothers Municipal Bond Index** +5.73 +6.19 +78.50/+91.05 -- - ----------------------------------------------------------------------------------------------------------------------- * Investment results shown do not reflect sales charges; results would be lower if a sales charge was included. Total investment returns are based on changes in net asset values for the periods shown, and assume reinvestment of all dividends and capital gains distributions at net asset value on the payable date. The Fund's 10-year/since inception periods are 10 years for Class B & Class I Shares and from 10/21/94 for Class A & Class C Shares. ** This unmanaged Index consists of long-term revenue bonds, prerefunded bonds, general obligation bonds and insured bonds. Ten-year/since inception total returns are for 10 years and from 10/31/94. 6 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Performance Data (concluded) Average Annual Total Return Return Without Return With Sales Charge Sales Charge** ================================================================================ Class A Shares* ================================================================================ One Year Ended 1/31/04 +7.01% +2.73% - -------------------------------------------------------------------------------- Five Years Ended 1/31/04 +4.99 +4.13 - -------------------------------------------------------------------------------- Inception (10/21/94) through 1/31/04 +6.39 +5.92 - -------------------------------------------------------------------------------- * Maximum sales charge is 4%. ** Assuming maximum sales charge. Return Return Without CDSC With CDSC** ================================================================================ Class B Shares* ================================================================================ One Year Ended 1/31/04 +6.58% +2.58% - -------------------------------------------------------------------------------- Five Years Ended 1/31/04 +4.56 +4.22 - -------------------------------------------------------------------------------- Ten Years Ended 1/31/04 +4.87 +4.87 - -------------------------------------------------------------------------------- * Maximum contingent deferred sales charge is 4% and is reduced to 0% after six years. ** Assuming payment of applicable contingent deferred sales charge. - -------------------------------------------------------------------------------- Return Return Without CDSC With CDSC** ================================================================================ Class C Shares* ================================================================================ One Year Ended 1/31/04 +6.48% +5.48% - -------------------------------------------------------------------------------- Five Years Ended 1/31/04 +4.45 +4.45 - -------------------------------------------------------------------------------- Inception (10/21/94) through 1/31/04 +5.84 +5.84 - -------------------------------------------------------------------------------- * Maximum contingent deferred sales charge is 1% and is reduced to 0% after one year. ** Assuming payment of applicable contingent deferred sales charge. - -------------------------------------------------------------------------------- Return Without Return With Sales Charge Sales Charge** ================================================================================ Class I Shares* ================================================================================ One Year Ended 1/31/04 +7.11% +2.82% - -------------------------------------------------------------------------------- Five Years Ended 1/31/04 +5.09 +4.23 - -------------------------------------------------------------------------------- Ten Years Ended 1/31/04 +5.40 +4.97 - -------------------------------------------------------------------------------- * Maximum sales charge is 4%. ** Assuming maximum sales charge. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 7 [LOGO] Merrill Lynch Investment Managers Schedule of Investments (in Thousands) S&P Moody's Face Ratings Ratings Amount Municipal Bonds Value =================================================================================================================================== Pennsylvania--86.9% - ----------------------------------------------------------------------------------------------------------------------------------- AAA Aaa $4,785 Allegheny County, Pennsylvania, IDA, Commercial Development Revenue Refunding Bonds (MPB Associates Project), 7.70% due 12/01/2013 (d) $ 6,067 ---------------------------------------------------------------------------------------------------------------------- BBB+ Baa1 1,500 Allegheny County, Pennsylvania, IDA, Environmental Improvement Revenue Refunding Bonds (USX Corporation), 6.10% due 7/15/2020 1,572 ---------------------------------------------------------------------------------------------------------------------- NR* NR* 1,000 Allegheny County, Pennsylvania, Redevelopment Authority, Tax Increment Revenue Bonds (Waterfront Project), Series A, 6.30% due 12/15/2018 1,090 ---------------------------------------------------------------------------------------------------------------------- BBB+ NR* 1,000 Bucks County, Pennsylvania, IDA, Revenue Refunding Bonds (Pennswood Village Project), Series A, 6% due 10/01/2027 1,034 ---------------------------------------------------------------------------------------------------------------------- BBB Baa2 1,000 Delaware County, Pennsylvania, Hospital Authority Revenue Bonds, GO (Crozer-Chester Medical Center), 6.25% due 12/15/2022 1,030 ---------------------------------------------------------------------------------------------------------------------- AA- Aa2 1,000 Delaware Valley, Pennsylvania, Regional Finance Authority, Local Government Revenue Bonds, 5.75% due 7/01/2032 1,163 ---------------------------------------------------------------------------------------------------------------------- NR* Aaa 2,200 Downingtown, Pennsylvania, Area School District, GO, Refunding, 5.70% due 3/01/2021 (a) 2,450 ---------------------------------------------------------------------------------------------------------------------- NR* NR* 920 Erie, Western Pennsylvania Port Authority Revenue Bonds, 6.875% due 6/15/2016 962 ---------------------------------------------------------------------------------------------------------------------- A- NR* 1,000 Lancaster County, Pennsylvania, Hospital Authority Revenue Bonds (Lancaster General Hospital Project), 5.50% due 3/15/2026 1,019 ---------------------------------------------------------------------------------------------------------------------- A A2 1,500 Lehigh County, Pennsylvania, General Purpose Authority, Hospital Revenue Bonds (Lehigh Valley Health Network), Series A, 5.25% due 7/01/2032 1,500 ---------------------------------------------------------------------------------------------------------------------- BBB Baa2 2,250 Lehigh County, Pennsylvania, General Purpose Authority, Hospital Revenue Refunding Bonds (Saint Lukes Hospital of Bethlehem), 5.375% due 8/15/2033 2,266 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 2,000 Luzerne County, Pennsylvania, IDA, Exempt Facilities Revenue Refunding Bonds (Pennsylvania Gas and Water Company Project), AMT, Series A, 7% due 12/01/2017 (a) 2,129 ---------------------------------------------------------------------------------------------------------------------- Mifflin County, Pennsylvania, Hospital Authority Revenue Refunding Bonds (Lewiston Hospital)(h): AA NR* 2,550 6.40% due 7/01/2020 2,906 AA NR* 1,000 6.20% due 7/01/2030 1,103 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 2,500 Pennsylvania Convention Center, Revenue Refunding Bonds, Series A, 6.75% due 9/01/2019 (f) 2,629 ---------------------------------------------------------------------------------------------------------------------- NR* NR* 1,000 Pennsylvania Economic Development Financing Authority, Exempt Facilities Revenue Bonds (National Gypsum Company), AMT, Series B, 6.125% due 11/01/2027 1,016 ---------------------------------------------------------------------------------------------------------------------- A Baa3 2,000 Pennsylvania Economic Development Financing Authority Revenue Bonds (30th Station Garage Project), AMT, 5.875% due 6/01/2033 2,105 ---------------------------------------------------------------------------------------------------------------------- BBB Baa2 4,000 Pennsylvania Economic Development Financing Authority, Wastewater Treatment Revenue Bonds (Sun Company Inc.--R & M Project), AMT, Series A, 7.60% due 12/01/2024 4,250 Portfolio Abbreviations To simplify the listings of Merrill Lynch Pennsylvania Municipal Bond Fund's portfolio holdings in the Schedule of Investments, we have abbreviated the names of many of the securities according to the list at right. AMT Alternative Minimum Tax (subject to) DRIVERS Derivative Inverse Tax-Exempt Receipts GO General Obligation Bonds HFA Housing Finance Agency IDA Industrial Development Authority RIB Residual Interest Bonds RITR Residual Interest Trust Receipts S/F Single-Family 8 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Schedule of Investments (continued) (in Thousands) S&P Moody's Face Ratings Ratings Amount Municipal Bonds Value =================================================================================================================================== Pennsylvania (concluded) - ----------------------------------------------------------------------------------------------------------------------------------- AA+ Aa2 $1,070 Pennsylvania HFA, S/F Mortgage Revenue Refunding Bonds, AMT, Series 59A, 5.80% due 10/01/2029 $ 1,110 ---------------------------------------------------------------------------------------------------------------------- AA+ Aa2 2,000 Pennsylvania HFA, S/F Revenue Refunding Bonds, AMT, Series 73A, 5.45% due 10/01/2032 2,068 ---------------------------------------------------------------------------------------------------------------------- NR* Aaa 1,500 Pennsylvania State, GO, RIB, Series 465X, 10.27% due 10/01/2019 (f)(i) 1,911 ---------------------------------------------------------------------------------------------------------------------- Pennsylvania State, GO, Refunding: AAA Aaa 4,000 First Series, 6% due 1/15/2017 (f) 4,670 AAA Aaa 1,000 Second Series, 5% due 10/01/2010 (c) 1,130 ---------------------------------------------------------------------------------------------------------------------- A- NR* 2,000 Pennsylvania State Higher Educational Facilities Authority, College and University Revenue Refunding Bonds (Ursinus College), 5.90% due 1/01/2007 (g) 2,268 ---------------------------------------------------------------------------------------------------------------------- BBB+ NR* 500 Pennsylvania State Higher Educational Facilities Authority, Revenue Refunding Bonds (Widener University), 5.375% due 7/15/2029 505 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 1,500 Pennsylvania State Public School Building Authority, School Lease Revenue Bonds (The School District of Philadelphia Project), 5% due 6/01/2033 (d) 1,545 ---------------------------------------------------------------------------------------------------------------------- AAA NR* 2,500 Pennsylvania State Public School Building Authority, School Revenue Bonds, DRIVERS, Series 371, 9.242% due 6/01/2011 (d)(i) 2,792 ---------------------------------------------------------------------------------------------------------------------- AAA NR* 2,500 Pennsylvania State Turnpike Commission, Oil Franchise Tax Revenue Bonds, DRIVERS, Series 366, 9.741% due 6/01/2011 (f)(i) 2,965 ---------------------------------------------------------------------------------------------------------------------- Philadelphia, Pennsylvania, Authority for Industrial Development, Senior Living Revenue Bonds: NR* Baa2 500 (Rieder House Project), Series A, 6.10% due 7/01/2033 485 NR* Baa2 500 (Saligman House Project), Series C, 6.10% due 7/01/2033 485 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 2,000 Philadelphia, Pennsylvania, Gas Works Revenue Bonds, 12th Series B, 7% due 5/15/2020 (b)(f) 2,533 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 1,000 Philadelphia, Pennsylvania, GO, Series A, 5% due 2/15/2010 (j) 1,112 ---------------------------------------------------------------------------------------------------------------------- AAA NR* 3,000 Philadelphia, Pennsylvania, Hospitals and Higher Education Facilities Authority, Hospital Revenue Refunding Bonds (Presbyterian Medical Center), 6.65% due 12/01/2019 (b) 3,788 ---------------------------------------------------------------------------------------------------------------------- A NR* 1,000 Philadelphia, Pennsylvania, Redevelopment Authority Revenue Bonds (Beech Student Housing Complex), Series A, 5.50% due 7/01/2035 1,019 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 4,400 Philadelphia, Pennsylvania, School District, GO, Series A, 5.75% due 2/01/2030 (d) 4,905 ---------------------------------------------------------------------------------------------------------------------- A- NR* 2,000 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Refunding Bonds (Guthrie Health), Series A, 5.875% due 12/01/2031 2,085 ---------------------------------------------------------------------------------------------------------------------- NR* Aa3 1,745 South Central Pennsylvania, General Authority, Revenue Refunding Bonds (Wellspan Health Obligated), 5.625% due 5/15/2026 1,820 ---------------------------------------------------------------------------------------------------------------------- AAA Aaa 1,500 Washington County, Pennsylvania, Capital Funding Authority Revenue Bonds (Capital Projects and Equipment Program), 6.15% due 12/01/2029 (a) 1,795 =================================================================================================================================== Guam--0.6% - ----------------------------------------------------------------------------------------------------------------------------------- B+ Ba3 500 Commonwealth of the Northern Mariana Islands, GO, Series A, 6.75% due 10/01/2033 512 =================================================================================================================================== Puerto Rico--8.1% - ----------------------------------------------------------------------------------------------------------------------------------- Children's Trust Fund Project of Puerto Rico, Tobacco Settlement Revenue Refunding Bonds: BBB Baa2 1,345 5.375% due 5/15/2033 1,283 BBB Baa2 1,280 5.625% due 5/15/2043 1,217 ---------------------------------------------------------------------------------------------------------------------- AAAr Aaa 2,000 Puerto Rico Commonwealth, GO, Refunding, RITR, Class R, Series 3, 10.233% due 7/01/2016 (f)(i) 2,683 ---------------------------------------------------------------------------------------------------------------------- Puerto Rico Electric Power Authority, Power Revenue Bonds, Series NN: A- A3 1,000 5.125% due 7/01/2024 1,033 A- A3 1,000 5.125% due 7/01/2029 1,027 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 9 [LOGO] Merrill Lynch Investment Managers Schedule of Investments (concluded) (in Thousands) S&P Moody's Face Ratings Ratings Amount Municipal Bonds Value =================================================================================================================================== Virgin Islands--1.8% - ----------------------------------------------------------------------------------------------------------------------------------- BBB- Baa3 $1,000 Virgin Islands Government Refinery Facilities, Revenue Refunding Bonds (Hovensa Coker Project), AMT, 6.50% due 7/01/2021 $ 1,080 ---------------------------------------------------------------------------------------------------------------------- BBB- Baa3 500 Virgin Islands Public Finance Authority, Refinery Facilities Revenue Bonds (Hovensa Refinery), AMT, 6.125% due 7/01/2022 528 ---------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds (Cost--$79,264)--97.4% 86,645 ====================================================================================================================== Shares Held Short-Term Securities ====================================================================================================================== 315 CMA Pennsylvania Municipal Money Fund (e) 315 ---------------------------------------------------------------------------------------------------------------------- Total Short-Term Securities (Cost--$315)--0.3% 315 =================================================================================================================================== Total Investments (Cost--$79,579)--97.7% 86,960 Unrealized Appreciation on Forward Interest Rate Swaps--Net**--0.0% 23 Other Assets Less Liabilities--2.3% 2,006 ------- Net Assets--100.0% $88,989 ======= (a) AMBAC Insured. (b) Escrowed to maturity. (c) FGIC Insured. (d) FSA Insured. (e) Investments in companies considered to be an affiliate of the Fund (such companies are defined as "Affiliated Companies" in Section 2(a)(3) of the Investment Company Act of 1940) are as follows: (in Thousands) -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- CMA Pennsylvania Municipal Money Fund (4,188) $6 -------------------------------------------------------------------------- (f) MBIA Insured. (g) Prerefunded. (h) Radian Insured. (i) The interest rate is subject to change periodically and inversely based upon prevailing market rates. The interest rate shown is the rate in effect at January 31, 2004. (j) XL Capital Insured. * Not Rated. ** Forward interest rate swaps entered into as of January 31, 2004 were as follows: (in Thousands) -------------------------------------------------------------------------- Unrealized Notional Appreciation Amount (Depreciation) -------------------------------------------------------------------------- Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index rate and pay a fixed rate of 4.19% Broker, Morgan Stanley Capital Services Inc. Expires March 2024 $6,300 $(2) Receive a variable rate equal to 7-Day Bond Market Association Municipal Swap Index rate and pay a fixed rate of 3.486% Broker, J.P. Morgan Chase Bank Expires April 2014 $2,700 25 -------------------------------------------------------------------------- Total $23 === See Notes to Financial Statements. 10 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Statement of Assets and Liabilities As of January 31, 2004 ===================================================================================================================== Assets - --------------------------------------------------------------------------------------------------------------------- Investments, at value (identified cost--$79,579,222) ..... $ 86,960,470 Cash ..................................................... 64,021 Unrealized appreciation on forward interest rate swaps ... 24,648 Receivables: Interest .............................................. $ 1,060,807 Securities sold ....................................... 1,056,371 Beneficial interest sold .............................. 71,276 Dividends from affiliates ............................. 3 2,188,457 ------------ Prepaid registration fees and other assets ............... 8,729 ------------ Total assets ............................................. 89,246,325 ------------ ===================================================================================================================== Liabilities - --------------------------------------------------------------------------------------------------------------------- Unrealized depreciation on forward interest rate swaps ... 1,884 Payables: Dividends to shareholders ............................. 98,971 Beneficial interest redeemed .......................... 70,182 Investment adviser .................................... 46,653 Distributor ........................................... 24,985 Other affiliates ...................................... 14,883 255,674 ----------------------------- Total liabilities ........................................ 257,558 ------------ ===================================================================================================================== Net Assets - --------------------------------------------------------------------------------------------------------------------- Net assets ............................................... $ 88,988,767 ============ ===================================================================================================================== Net Assets Consist of - --------------------------------------------------------------------------------------------------------------------- Class A Shares of beneficial interest, $.10 par value, unlimited number of shares authorized .................... $ 235,037 Class B Shares of beneficial interest, $.10 par value, unlimited number of shares authorized .................... 320,761 Class C Shares of beneficial interest, $.10 par value, unlimited number of shares authorized .................... 119,416 Class I Shares of beneficial interest, $.10 par value, unlimited number of shares authorized .................... 103,175 Paid-in capital in excess of par ......................... 83,336,649 Undistributed investment income--net ..................... $ 51,097 Accumulated realized capital losses on investments--net .. (2,581,380) Unrealized appreciation on investments--net .............. 7,404,012 ------------ Total accumulated earnings--net .......................... 4,873,729 ------------ Net Assets ............................................... $ 88,988,767 ============ ===================================================================================================================== Net Asset Value - --------------------------------------------------------------------------------------------------------------------- Class A--Based on net assets of $26,892,272 and 2,350,368 shares of beneficial interest outstanding ...... $ 11.44 ============ Class B--Based on net assets of $36,657,272 and 3,207,611 shares of beneficial interest outstanding ...... $ 11.43 ============ Class C--Based on net assets of $13,647,832 and 1,194,163 shares of beneficial interest outstanding ...... $ 11.43 ============ Class I--Based on net assets of $11,791,391 and 1,031,753 shares of beneficial interest outstanding ...... $ 11.43 ============ See Notes to Financial Statements. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 11 [LOGO] Merrill Lynch Investment Managers Statement of Operations For the Six Months Ended January 31, 2004 ===================================================================================================================== Investment Income - --------------------------------------------------------------------------------------------------------------------- Interest ................................................. $ 2,431,787 Dividends from affiliates ................................ 5,798 ------------ Total income ............................................. 2,437,585 ------------ ===================================================================================================================== Expenses - --------------------------------------------------------------------------------------------------------------------- Investment advisory fees ................................. $ 249,048 Account maintenance and distribution fees--Class B ....... 100,004 Account maintenance and distribution fees--Class C ....... 40,535 Accounting services ...................................... 39,796 Professional fees ........................................ 29,792 Printing and shareholder reports ......................... 25,330 Account maintenance fees--Class A ........................ 12,779 Transfer agent fees--Class B ............................. 12,510 Registration fees ........................................ 9,890 Transfer agent fees--Class A ............................. 6,901 Trustees' fees and expenses .............................. 4,823 Transfer agent fees--Class C ............................. 4,244 Custodian fees ........................................... 3,722 Pricing fees ............................................. 3,290 Transfer agent fees--Class I ............................. 3,098 Other .................................................... 6,512 ------------ Total expenses before reimbursement ...................... 552,274 Reimbursement of expenses ................................ (7,716) ------------ Total expenses after reimbursement ....................... 544,558 ------------ Investment income--net ................................... 1,893,027 ------------ ===================================================================================================================== Realized & Unrealized Gain on Investments--Net - --------------------------------------------------------------------------------------------------------------------- Realized gain on investments--net ........................ 591,561 Change in unrealized appreciation on investments--net .... 2,551,076 ------------ Total realized and unrealized gain on investments--net ... 3,142,637 ------------ Net Increase in Net Assets Resulting from Operations ..... $ 5,035,664 ============ See Notes to Financial Statements. 12 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Statements of Changes in Net Assets For the Six For the Months Ended Year Ended January 31, July 31, Increase (Decrease) in Net Assets: 2004 2003 ===================================================================================================================== Operations - --------------------------------------------------------------------------------------------------------------------- Investment income--net ...................................... $ 1,893,027 $ 4,144,696 Realized gain on investments--net ........................... 591,561 356,164 Change in unrealized appreciation on investments--net ....... 2,551,076 (1,374,424) ----------------------------- Net increase in net assets resulting from operations ........ 5,035,664 3,126,436 ----------------------------- ===================================================================================================================== Dividends to Shareholders - --------------------------------------------------------------------------------------------------------------------- Investment income--net: Class A .................................................. (566,016) (964,384) Class B .................................................. (807,778) (2,139,645) Class C .................................................. (265,337) (477,116) Class I .................................................. (260,694) (560,042) ----------------------------- Net decrease in net assets resulting from dividends to shareholders ................................................ (1,899,825) (4,141,187) ----------------------------- ===================================================================================================================== Beneficial Interest Transactions - --------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets derived from beneficial interest transactions ....................................... (5,310,919) 49,289 ----------------------------- ===================================================================================================================== Net Assets - --------------------------------------------------------------------------------------------------------------------- Total decrease in net assets ................................ (2,175,080) (965,462) Beginning of period ......................................... 91,163,847 92,129,309 ----------------------------- End of period* .............................................. $ 88,988,767 $ 91,163,847 ============================= * Undistributed investment income--net ................... $ 51,097 $ 57,895 ============================= See Notes to Financial Statements. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 13 [LOGO] Merrill Lynch Investment Managers Financial Highlights Class A ------------------------------------------------------------------ The following per share data and ratios have been derived For the Six For the from information provided in the financial statements. Months Ended Year Ended July 31,++ January 31, ------------------------------------------------- Increase (Decrease) in Net Asset Value: 2004 2003 2002 2001 2000 =================================================================================================================================== Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .................. $ 11.05 $ 11.17 $ 11.00 $ 10.55 $ 10.92 ---------------------------------------------------------------- Investment income--net ................................ .25+ .53+ .53 .53 .53 Realized and unrealized gain (loss) on investments--net .39 (.12) .17 .45 (.31) ---------------------------------------------------------------- Total from investment operations ...................... .64 .41 .70 .98 .22 ---------------------------------------------------------------- Less dividends and distributions: Investment income--net ............................. (.25) (.53) (.53) (.53) (.53) In excess of realized gain on investments--net ..... -- -- -- -- (.06) ---------------------------------------------------------------- Total dividends and distributions ..................... (.25) (.53) (.53) (.53) (.59) ---------------------------------------------------------------- Net asset value, end of period ........................ $ 11.44 $ 11.05 $ 11.17 $ 11.00 $ 10.55 ================================================================ =================================================================================================================================== Total Investment Return** - ----------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .................... 5.86%@ 3.69% 6.50% 9.51% 2.25% ================================================================ =================================================================================================================================== Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Expenses, net of reimbursement ........................ .96%* .98% 1.00% .95% .91% ================================================================ Expenses .............................................. .97%* .99% 1.00% .95% .91% ================================================================ Investment income--net ................................ 4.40%* 4.69% 4.78% 4.91% 5.09% ================================================================ =================================================================================================================================== Supplemental Data - ----------------------------------------------------------------------------------------------------------------------------------- Net assets, end of period (in thousands) .............. $ 26,892 $ 23,460 $ 16,295 $ 12,121 $ 6,673 ================================================================ Portfolio turnover .................................... 39.52% 34.92% 30.23% 73.23% 51.32% ================================================================ * Annualized. ** Total investment returns exclude the effects of sales charges. + Based on average shares outstanding. ++ Effective April 14, 2003, Class D Shares were redesignated Class A Shares. @ Aggregate total investment return. See Notes to Financial Statements. 14 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Financial Highlights (continued) Class B ------------------------------------------------------------------ The following per share data and ratios have been derived For the Six For the from information provided in the financial statements. Months Ended Year Ended July 31, January 31, ------------------------------------------------- Increase (Decrease) in Net Asset Value: 2004 2003 2002 2001 2000 =================================================================================================================================== Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .................. $ 11.03 $ 11.16 $ 10.99 $ 10.54 $ 10.90 ---------------------------------------------------------------- Investment income--net ................................ .23+ .49+ .48 .49 .48 Realized and unrealized gain (loss) on investments--net .40 (.14) .17 .45 (.30) ---------------------------------------------------------------- Total from investment operations ...................... .63 .35 .65 .94 .18 ---------------------------------------------------------------- Less dividends and distributions: Investment income--net ............................. (.23) (.48) (.48) (.49) (.48) In excess of realized gain on investments--net ..... -- -- -- -- (.06) ---------------------------------------------------------------- Total dividends and distributions ..................... (.23) (.48) (.48) (.49) (.54) ---------------------------------------------------------------- Net asset value, end of period ........................ $ 11.43 $ 11.03 $ 11.16 $ 10.99 $ 10.54 ================================================================ =================================================================================================================================== Total Investment Return** - ----------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .................... 5.75%@ 3.18% 6.07% 9.07% 1.92% ================================================================ =================================================================================================================================== Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Expenses, net of reimbursement ........................ 1.36%* 1.39% 1.40% 1.35% 1.32% ================================================================ Expenses .............................................. 1.38%* 1.40% 1.40% 1.35% 1.32% ================================================================ Investment income--net ................................ 4.01%* 4.31% 4.36% 4.52% 4.69% ================================================================ =================================================================================================================================== Supplemental Data - ----------------------------------------------------------------------------------------------------------------------------------- Net assets, end of period (in thousands) .............. $ 36,657 $ 43,099 $ 54,421 $ 60,252 $ 68,723 ================================================================ Portfolio turnover .................................... 39.52% 34.92% 30.23% 73.23% 51.32% ================================================================ * Annualized. ** Total investment returns exclude the effects of sales charges. + Based on average shares outstanding. @ Aggregate total investment return. See Notes to Financial Statements. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 15 [LOGO] Merrill Lynch Investment Managers Financial Highlights (continued) Class C ------------------------------------------------------------------ The following per share data and ratios have been derived For the Six For the from information provided in the financial statements. Months Ended Year Ended July 31, January 31, ------------------------------------------------- Increase (Decrease) in Net Asset Value: 2004 2003 2002 2001 2000 =================================================================================================================================== Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .................. $ 11.03 $ 11.16 $ 10.99 $ 10.54 $ 10.90 ---------------------------------------------------------------- Investment income--net ................................ .22+ .47+ .47 .48 .47 Realized and unrealized gain (loss) on investments--net .40 (.13) .17 .45 (.30) ---------------------------------------------------------------- Total from investment operations ...................... .62 .34 .64 .93 .17 ---------------------------------------------------------------- Less dividends and distributions: Investment income--net ............................. (.22) (.47) (.47) (.48) (.47) In excess of realized gain on investments--net ..... -- -- -- -- (.06) ---------------------------------------------------------------- Total dividends and distributions ..................... (.22) (.47) (.47) (.48) (.53) ---------------------------------------------------------------- Net asset value, end of period ........................ $ 11.43 $ 11.03 $ 11.16 $ 10.99 $ 10.54 ================================================================ =================================================================================================================================== Total Investment Return** - ----------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .................... 5.69%@ 3.07% 5.96% 8.97% 1.82% ================================================================ =================================================================================================================================== Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Expenses, net of reimbursement ........................ 1.46%* 1.49% 1.51% 1.45% 1.42% ================================================================ Expenses .............................................. 1.48%* 1.49% 1.51% 1.45% 1.42% ================================================================ Investment income--net ................................ 3.90%* 4.18% 4.27% 4.42% 4.60% ================================================================ =================================================================================================================================== Supplemental Data - ----------------------------------------------------------------------------------------------------------------------------------- Net assets, end of period (in thousands) .............. $ 13,648 $ 13,309 $ 9,309 $ 7,007 $ 5,874 ================================================================ Portfolio turnover .................................... 39.52% 34.92% 30.23% 73.23% 51.32% ================================================================ * Annualized. ** Total investment returns exclude the effects of sales charges. + Based on average shares outstanding. @ Aggregate total investment return. See Notes to Financial Statements. 16 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Financial Highlights (concluded) Class I ------------------------------------------------------------------ The following per share data and ratios have been derived For the Six For the from information provided in the financial statements. Months Ended Year Ended July 31,++ January 31, ------------------------------------------------- Increase (Decrease) in Net Asset Value: 2004 2003 2002 2001 2000 =================================================================================================================================== Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .................. $ 11.03 $ 11.16 $ 10.99 $ 10.54 $ 10.90 ---------------------------------------------------------------- Investment income--net ................................ .26+ .54+ .54 .54 .54 Realized and unrealized gain (loss) on investments--net .40 (.13) .17 .45 (.30) ---------------------------------------------------------------- Total from investment operations ...................... .66 .41 .71 .99 .24 ---------------------------------------------------------------- Less dividends and distributions: Investment income--net ............................. (.26) (.54) (.54) (.54) (.54) In excess of realized gain on investments--net ..... -- -- -- -- (.06) ---------------------------------------------------------------- Total dividends and distributions ..................... (.26) (.54) (.54) (.54) (.60) ---------------------------------------------------------------- Net asset value, end of period ........................ $ 11.43 $ 11.03 $ 11.16 $ 10.99 $ 10.54 ================================================================ =================================================================================================================================== Total Investment Return** - ----------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .................... 6.02%@ 3.69% 6.61% 9.63% 2.44% ================================================================ =================================================================================================================================== Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Expenses, net of reimbursement ........................ .86%* .88% .90% .84% .81% ================================================================ Expenses .............................................. .87%* .89% .90% .84% .81% ================================================================ Investment income--net ................................ 4.51%* 4.81% 4.88% 5.03% 5.20% ================================================================ =================================================================================================================================== Supplemental Data - ----------------------------------------------------------------------------------------------------------------------------------- Net assets, end of period (in thousands) .............. $ 11,791 $ 11,296 $ 12,104 $ 13,578 $ 14,494 ================================================================ Portfolio turnover .................................... 39.52% 34.92% 30.23% 73.23% 51.32% ================================================================ * Annualized. ** Total investment returns exclude the effects of sales charges. + Based on average shares outstanding. ++ Effective April 14, 2003, Class A Shares were redesignated Class I Shares. @ Aggregate total investment return. See Notes to Financial Statements. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 17 [LOGO] Merrill Lynch Investment Managers Notes to Financial Statements 1. Significant Accounting Policies: Merrill Lynch Pennsylvania Municipal Bond Fund (the "Fund") is part of Merrill Lynch Multi-State Municipal Series Trust (the "Trust"). The Fund is registered under the Investment Company Act of 1940, as amended, as a non-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. These unaudited financial statements reflect all adjustments, which are, in the opinion of management, necessary to a fair statement of the results for the interim period presented. All such adjustments are of normal, recurring nature. The Fund offers multiple classes of shares. Shares of Class A and Class I are sold with a front-end sales charge. Shares of Class B and Class 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 Class A, Class B and Class C Shares bear certain expenses related to the account maintenance of such shares, and Class B and Class 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 account maintenance and distribution expenditures. Income, expenses (other than expenses attributable to a specific class) and realized and unrealized gains and losses on investments are allocated daily to each class based on its relative net assets. The following is a summary of significant accounting policies followed by the Fund. (a) Valuation of investments -- Municipal bonds and other portfolio securities in which the Fund invests are traded primarily in the over-the-counter municipal bond and money markets and are valued at the last available bid price in the over-the-counter market or on the basis of yield equivalents as obtained from one or more dealers that make markets in the securities. Financial futures contracts and options thereon, which are traded on exchanges, are valued at their settlement prices as of the close of such exchanges. Swap agreements are valued by quoted fair values received daily by the Fund from the counterparty. Short-term investments with a remaining maturity of sixty days or less are valued at amortized cost, which approximates market value. Securities and assets for which market quotations are not readily available are valued at fair value as determined in good faith by or under the direction of the Board of Trustees of the Trust, including valuations furnished by a pricing service retained by the Trust, which may utilize a matrix system for valuations. The procedures of the pricing service and its valuations are reviewed by the officers of the Trust under the general supervision of the Board of Trustees. (b) 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 due to changes in the value of the contract 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 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 variation margin and are recorded 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. When the agreement is closed, the Fund records a realized gain or loss in an amount equal to the value of the agreement. 18 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Notes to Financial Statements (continued) (c) 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. (d) Security transactions and investment income -- Security transactions are recorded on the dates the transactions are entered into (the trade dates). Realized gains and losses on security transactions are determined 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. (e) Prepaid registration fees -- Prepaid registration fees are charged to expense as the related shares are issued. (f) 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. (g) Expenses -- Certain expenses have been allocated to the individual funds in the Trust on a pro rata basis based upon the respective aggregate net asset value of each fund included in the Trust. 2. Investment Advisory Agreement and Transactions with Affiliates: The Fund has entered into an Investment Advisory Agreement with Fund Asset Management, L.P. ("FAM"). The general partner of FAM is Princeton Services, Inc. ("PSI"), an indirect, wholly-owned subsidiary of Merrill Lynch & Co., Inc. ("ML & Co."), which is the limited partner. The Fund has also entered into a Distribution Agreement and Distribution Plans with FAM Distributors, Inc. ("FAMD" or the "Distributor"), which is a wholly-owned subsidiary of Merrill Lynch Group, Inc. FAM is responsible for the management of the Fund's portfolio and provides the necessary personnel, facilities, equipment and certain other services necessary to the operations of the Fund. For such services, the Fund pays a monthly fee based upon the average daily value of the Fund's net assets at the following annual rates: .55% of the Fund's average daily net assets not exceeding $500 million; .525% of average daily net assets in excess of $500 million but not exceeding $1 billion; and .50% of average daily net assets in excess of $1 billion. For the six months ended January 31, 2004, FAM reimbursed the Fund in the amount of $7,716. Pursuant to the Distribution Plans adopted by the Fund in accordance with Rule 12b-1 under the Investment Company Act of 1940, the Fund pays the Distributor ongoing account maintenance 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: - -------------------------------------------------------------------------------- Account Distribution Maintenance Fee Fee - -------------------------------------------------------------------------------- Class A ................................ .10% -- Class B ................................ .25% .25% Class C ................................ .25% .35% - -------------------------------------------------------------------------------- Pursuant to a sub-agreement with the Distributor, Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S"), a subsidiary of ML & Co., also provides account maintenance and distribution services to the Fund. The ongoing account maintenance fee compensates the Distributor and MLPF&S for providing account maintenance services to Class A, Class B and Class C shareholders. The ongoing distribution fee compensates the Distributor and MLPF&S for providing shareholder and distribution-related services to Class B and Class C shareholders. For the six months ended January 31, 2004, FAMD earned underwriting discounts and MLPF&S earned dealer concessions on sales of the Fund's Class A and Class I Shares as follows: - -------------------------------------------------------------------------------- FAMD MLPF&S - -------------------------------------------------------------------------------- Class A .............................. $ 948 $7,862 Class I .............................. $ 24 $ 268 - -------------------------------------------------------------------------------- For the six months ended January 31, 2004, MLPF&S received contingent deferred sales charges of $16,454 and $884 relating to transactions in Class B and Class C Shares, respectively. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 19 [LOGO] Merrill Lynch Investment Managers Notes to Financial Statements (continued) Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of ML & Co., is the Fund's transfer agent. For the six months ended January 31, 2004, the Fund reimbursed FAM $921 for certain accounting services. Certain officers and/or trustees of the Fund are officers and/or directors of FAM, PSI, FDS, FAMD, and/or ML & Co. 3. Investments: Purchases and sales of investments, excluding short-term securities, for the six months ended January 31, 2004 were $34,341,109 and $33,869,904, respectively. Net realized gains for the six months ended January 31, 2004 and net unrealized gains as of January 31, 2004 were as follows: - -------------------------------------------------------------------------------- Realized Unrealized Gains Gains - -------------------------------------------------------------------------------- Long-term investments .................... $ 58,559 $7,381,248 Forward interest rate swaps .............. 533,002 22,764 ----------------------------- Total .................................... $ 591,561 $7,404,012 ============================= As of January 31, 2004, net unrealized appreciation for Federal income tax purposes aggregated $7,385,765, of which $7,415,055 related to appreciated securities and $29,290 related to depreciated securities. The aggregate cost of investments at January 31, 2004 for Federal income tax purposes was $79,574,705. 4. Beneficial Interest Transactions: Net increase (decrease) in net assets derived from beneficial interest transactions was $(5,310,919) and $49,289 for the six months ended January 31, 2004 and for the year ended July 31, 2003, respectively. Transactions in shares of beneficial interest for each class were as follows: - ------------------------------------------------------------------------------- Class A Shares for the Six Months Dollar Ended January 31, 2004 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 40,694 $ 460,643 Automatic conversion of shares ........... 336,211 3,773,023 Shares issued to shareholders in reinvestment of dividends .............. 24,384 275,304 ----------------------------- Total issued ............................. 401,289 4,508,970 Shares redeemed .......................... (174,602) (1,959,194) ----------------------------- Net increase ............................. 226,687 $ 2,549,776 ============================= - ------------------------------------------------------------------------------- Class A Shares for the Year Dollar Ended July 31, 2003 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 127,366 $ 1,430,014 Automatic conversion of shares ........... 685,816 7,757,166 Shares issued to shareholders in reinvestment of dividends .............. 42,608 480,285 ----------------------------- Total issued ............................. 855,790 9,667,465 Shares redeemed .......................... (190,556) (2,147,504) ----------------------------- Net increase ............................. 665,234 $ 7,519,961 ============================= 20 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Notes to Financial Statements (continued) - ------------------------------------------------------------------------------- Class B Shares for the Six Months Dollar Ended January 31, 2004 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 45,858 $ 512,879 Shares issued to shareholders in reinvestment of dividends .............. 35,433 399,032 ----------------------------- Total issued ............................. 81,291 911,911 Automatic conversion of shares ........... (336,615) (3,773,023) Shares redeemed .......................... (443,068) (4,970,281) ----------------------------- Net decrease ............................. (698,392) $ (7,831,393) ============================= - ------------------------------------------------------------------------------- Class B Shares for the Year Dollar Ended July 31, 2003 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 391,686 $ 4,420,473 Shares issued to shareholders in reinvestment of dividends .............. 93,594 1,053,147 ----------------------------- Total issued ............................. 485,280 5,473,620 Automatic conversion of shares ........... (686,486) (7,757,166) Shares redeemed .......................... (769,446) (8,688,344) ----------------------------- Net decrease ............................. (970,652) $(10,971,890) ============================= - ------------------------------------------------------------------------------- Class C Shares for the Six Months Dollar Ended January 31, 2004 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 90,548 $ 1,018,666 Shares issued to shareholders in reinvestment of dividends .............. 13,532 152,551 ----------------------------- Total issued ............................. 104,080 1,171,217 Shares redeemed .......................... (116,082) (1,299,925) ----------------------------- Net decrease ............................. (12,002) $ (128,708) ============================= - ------------------------------------------------------------------------------- Class C Shares for the Year Dollar Ended July 31, 2003 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 491,888 $ 5,547,248 Shares issued to shareholders in reinvestment of dividends .............. 23,499 264,648 ----------------------------- Total issued ............................. 515,387 5,811,896 Shares redeemed .......................... (143,404) (1,628,417) ----------------------------- Net increase ............................. 371,983 $ 4,183,479 ============================= - ------------------------------------------------------------------------------- Class I Shares for the Six Months Dollar Ended January 31, 2004 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 77,784 $ 881,500 Shares issued to shareholders in reinvestment of dividends .............. 12,619 142,241 ----------------------------- Total issued ............................. 90,403 1,023,741 Shares redeemed .......................... (82,350) (924,335) ----------------------------- Net increase ............................. 8,053 $ 99,406 ============================= - ------------------------------------------------------------------------------- Class I Shares for the Year Dollar Ended July 31, 2003 Shares Amount - ------------------------------------------------------------------------------- Shares sold .............................. 83,885 $ 949,230 Shares issued to shareholders in reinvestment of dividends .............. 25,095 282,463 ----------------------------- Total issued ............................. 108,980 1,231,693 Shares redeemed .......................... (169,901) (1,913,954) ----------------------------- Net decrease ............................. (60,921) $ (682,261) ============================= MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 21 [LOGO] Merrill Lynch Investment Managers Notes to Financial Statements (concluded) 5. Short-Term Borrowings: The Fund, along with certain other funds managed by FAM and its affiliates, is a party to a $500,000,000 credit agreement with Bank One, N.A. and certain other 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. The Fund pays a commitment fee of .09% per annum based on the Fund's pro rata share of the unused portion of the credit agreement. Amounts borrowed under the credit agreement bear interest at a rate equal to, at each fund's election, the Federal Funds rate plus .50% or a base rate as determined by Bank One, N.A. On November 28, 2003, the credit agreement was renewed for one year under the same terms. The Fund did not borrow under the credit agreement during the six months ended January 31, 2004. 6. Capital Loss Carryforward: On July 31, 2003, the Fund had a net capital loss carryforward of $2,422,327, all of which expires in 2009. This amount will be available to offset like amounts of any future taxable gains. 22 MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 Electronic Delivery The Fund offers electronic delivery of communications to its shareholders. In order to receive this service, you must register your account and provide us with e-mail information. To sign up for this service, simply access this website http://www.icsdelivery.com/live and follow the instructions. When you visit this site, you will obtain a personal identification number (PIN). You will need this PIN should you wish to update your e-mail address, choose to discontinue this service and/or make any other changes to the service. This service is not available for certain retirement accounts at this time. MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND JANUARY 31, 2004 23 [LOGO] Merrill Lynch Investment Managers www.mlim.ml.com 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 return 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. 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 1-800-MER-FUND (1-800-637-3863); (2) on www.mutualfunds.ml.com; and (3) on the Securities and Exchange Commission's website at http://www.sec.gov. Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series Trust Box 9011 Princeton, NJ 08543-9011 #11299 -- 1/04 Item 2 - Code of Ethics - Not Applicable to this semi-annual report Item 3 - Audit Committee Financial Expert - Not Applicable to this semi-annual report Item 4 - Principal Accountant Fees and Services - Not Applicable to this semi-annual report Item 5 - Audit Committee of Listed Registrants - Not Applicable Item 6 - Reserved Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable Item 8 - Reserved Item 9 - Submission of Matters to a Vote of Security Holders - Not Applicable Item 10 - Controls and Procedures 10(a) - The registrant's certifying officers have reasonably designed such disclosure controls and procedures to ensure material information relating to the registrant is made known to us by others particularly during the period in which this report is being prepared. The registrant's certifying officers have determined that the registrant's disclosure controls and procedures are effective based on our evaluation of these controls and procedures as of a date within 90 days prior to the filing date of this report. 10(b) - There were no significant changes in the registrant's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses. Item 11 - Exhibits attached hereto 11(a) - Not Applicable 11(b) - 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. Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series Trust By: /s/ Terry K. Glenn ------------------------------- Terry K. Glenn, President of Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series Trust Date: March 19, 2004 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/ Terry K. Glenn ------------------------------- Terry K. Glenn, President of Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series Trust Date: March 19, 2004 By: /s/ Donald C. Burke ------------------------------- Donald C. Burke, Chief Financial Officer of Merrill Lynch Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series Trust Date: March 19, 2004