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 811-5011 Name of Fund: CMA California Municipal Money Fund of CMA 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, CMA California Municipal Money Fund of CMA 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: 03/31/04 Date of reporting period: 04/01/03 - 09/30/03 Item 1 - Attach shareholder report [LOGO] Merrill Lynch Investment Managers www.mlim.ml.com CMA California Municipal Money Fund Semi-Annual Report September 30, 2003 [LOGO] Merrill Lynch Investment Managers CMA California Municipal Money Fund Officers and Trustees Terry K. Glenn, President and Trustee Ronald W. Forbes, Trustee Cynthia A. Montgomery, Trustee Charles C. Reilly, Trustee Kevin A. Ryan, Trustee Roscoe S. Suddarth, Trustee Richard R. West, Trustee Edward D. Zinbarg, Trustee Kenneth A. Jacob, Senior Vice President John M. Loffredo, Senior Vice President Steven T. Lewis, Vice President Donald C. Burke, Vice President and Treasurer Phillip S. Gillespie, 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 800-221-7210* * For inquiries regarding your CMA account, call 800-CMA-INFO (800-262-4636). Electronic Delivery The Fund is now offering 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. 2 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 A Letter From the President Dear Shareholder Now in its final quarter, 2003 has been a meaningful year in many respects. After one of the most significant equity market downturns in many investors' memories, this year finally brought hopeful signs for a sustainable economic recovery. Sub par economic growth of 1.4% in the first quarter of 2003 increased to projected growth of more than 4% in the second half of the year. With that good news, fixed income investments, which had become the asset class of choice during the long equity market decline, faced new challenges. The Federal Reserve Board continued its accommodative monetary policy, lowering the Federal Funds rate in June to 1%, its lowest level since 1958. With this move, the short end of the yield curve remained relatively flat and it became increasingly difficult to find attractive income opportunities. Through September 30, 2003, both the Bond Market Association (BMA) Index and the one-year Municipal Market Data (MMD) Index averaged 1.03% for the year. Rates on the BMA Index, which measures the shortest end of the yield curve, averaged .85% during the third quarter versus 1.16% in the second quarter. Rates on the one-year MMD Index averaged .98% in the third quarter, just below the second quarter average of 1%. Against this backdrop, our portfolio managers continued to work diligently to maximize tax-exempt returns consistent with the preservation of capital. With that said, remember also that the advice and guidance of a skilled financial advisor often can help you choose those investments that will best serve you as you plan for your financial future. Finally, I am proud to premiere a new look to our shareholder communications. Our portfolio manager commentaries have been trimmed and organized in such a way that you can get the information you need at a glance, in plain language. Today's markets are confusing enough. We want to help you put it all in perspective. The report's new size also allows us certain mailing efficiencies. Any cost savings in production or postage are passed on to the Fund and, ultimately, to Fund shareholders. 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 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 3 [LOGO] Merrill Lynch Investment Managers A Discussion With Your Fund's Portfolio Manager With interest rates low and expected to remain that way for some time, we looked increasingly to the higher yields offered by fixed rate notes during the period. How did the Fund perform during the period in light of the existing market conditions? For the six-month period ended September 30, 2003, CMA California Municipal Money Fund paid shareholders a net annualized yield of .52%.* As of September 30, 2003, the Fund's seven-day yield was .52%. The Federal Reserve Board cut the Federal Funds rate once more during the six-month period, sending interest rates to their lowest levels in almost 50 years. Despite indications that the economy was strengthening gradually, the Federal Reserve Board emphasized its concern that deflation was a bigger threat to the economy than inflation, and reassured investors that it planned to keep short-term interest rates low until consistent growth in the economy and employment was evident. The expectation for a stable short-term interest rate environment created a strong demand for fixed rate notes with maturities of six months - one year. This caused yields on these notes to fall later in the period and somewhat flattened the yield curve when compared to variable rate demand securities. However, our aggressive pursuit of fixed rate notes earlier in the period enabled us to lock in a favorable spread above variable rate securities. This strategy enhanced the performance of the Fund during the six-month period. Describe conditions in the State of California during the period. We expect some stabilization of the state's political climate following the gubernatorial recall election in early October, which should lead to meaningful budgetary debate by year-end. The state legislature still faces an $8 billion revenue shortfall for the current fiscal year that ends in June 2004. Having issued $7.5 billion in short-term debt in June, the state is expected to issue an additional $3 billion in revenue anticipation notes in mid-October. This should complete California's short-term financing for the current fiscal year. The notes are likely to be enhanced, with letters of credit that should allow the state to receive favorable short-term ratings. How did you manage the Fund during the period? During the period, our belief that fixed rate notes offered an attractive investment opportunity led us to overweight our allocation in these securities relative to the funds in our iMoneyNet, Inc. category. Additionally, our reinvestment decisions were strongly influenced by the fact that the issuance of California short-term notes is predominately done in the early summer months. These circumstances provide a narrow window of opportunity to properly diversify the Fund's assets and extend the portfolio's average life. We were active participants during the summer note season and purchased in excess of $400 million in these securities with yields that ranged from .93% to 1.10%. * Based on a constant investment throughout the period, with dividends compounded daily, and reflecting a net return to the investor after all expenses. 4 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 How would you characterize the portfolio's position at the close of the period? At the close of the period, we continued to take a longer than neutral approach to the short-term municipal market, maintaining the Fund's average life at 55 days, compared to an average of 50 days for funds in our iMoneyNet group. We expect to continue to take advantage of opportunities to buy longer-dated fixed notes when they become available. The portfolio's weighting in fixed paper was 22% of assets as of September 30, 2003. In the months ahead, we will continue to monitor developments in the national economy as well as the credit quality of the Fund's holdings. We intend to maintain our basic investment strategy while shifting the Fund's allocation between fixed and variable rate notes in what we believe are the best interests of our shareholders. We also will keep a watchful eye on the Federal Reserve Board's monetary policy. Although we have a stable outlook for short-term interest rates, we will be ready to respond with changes to our investment approach as needed. Steven T. Lewis Vice President and Portfolio Manager October 9, 2003 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 5 [LOGO] Merrill Lynch Investment Managers Schedule of Investments (in Thousands) Face State Amount Municipal Bonds Value ==================================================================================================================================== California--98.1% $ 6,495 ABN AMRO Munitops Certificates Trust, California, GO, Refunding, VRDN, Series 2003-1, 1.13% due 2/01/2010 (a)(d) ................................................ $ 6,495 ABN AMRO Munitops Certificates Trust, VRDN (a): 10,045 GO, Series 2003-9, 1.12% due 9/01/2011 (b) .................................. 10,045 16,912 Series 1998-17, 1.13% due 7/05/2006 (c) ..................................... 16,912 5,000 Series 1998-25, 1.13% due 7/05/2006 (c) ..................................... 5,000 5,373 Series 1999-7, 1.10% due 7/04/2007 (b) ...................................... 5,373 10,000 Abag Finance Authority for Non-Profit Corporations, California, Lease Revenue Bonds, Pass-Thru Obligations, VRDN, Series A, 1.10% due 7/01/2008 (a) ............. 10,000 27,700 Abag Finance Authority for Non-Profit Corporations, California, Revenue Bonds (Jewish Community Center Project), VRDN, 1.13% due 11/15/2031 (a) ................. 27,700 15,000 Auburn, California, Union School District, COP, Refunding, VRDN, 1.05% due 12/01/2032 (a)(e) ............................................................. 15,000 16,415 Bakersfield, California, Hospital Revenue Refunding Bonds, FLOATS, Series 788, 1.13% due 3/01/2019 (a)(b) ........................................................ 16,415 6,500 Bay Area, California, Toll Authority, Toll Bridge Revenue Bonds (San Francisco Bay Area), VRDN, Series C, 1.05% due 4/01/2037 (a)(d) ................................. 6,500 California Educational Facilities Authority Revenue Bonds, VRDN (a): 10,800 (Life Chiropractic College), 1.04% due 1/01/2025 ............................ 10,800 1,445 (Pepperdine University), Series B, 1.04% due 11/01/2029 ..................... 1,445 6,400 (San Francisco Conservatory), 1.10% due 3/01/2025 ........................... 6,400 California HFA, Home Mortgage Revenue Bonds, VRDN (a): 2,000 AMT, Series B, 1.20% due 8/01/2033 (e) ...................................... 2,000 26,000 AMT, Series J, 1.11% due 2/01/2033 .......................................... 26,000 18,500 AMT, Series M, 1.15% due 2/01/2025 .......................................... 18,500 1,295 Series F, 1.10% due 2/01/2033 (d)(e) ........................................ 1,295 California HFA, M/F Housing Revenue Bonds, VRDN, AMT (a): 6,650 Series A, 1.14% due 2/01/2026 ............................................... 6,650 53,300 Series C, 1.20% due 2/01/2033 ............................................... 53,300 California Health Facilities Financing Authority Revenue Bonds, FLOATS (a)(b): 22,265 Series 591, 1.13% due 3/01/2014 ............................................. 22,265 28,345 Series 592, 1.13% due 3/01/2021 ............................................. 28,345 2,500 California Infrastructure and Economic Development Bank Empowerment Revenue Bonds (Gold Coast Baking Company Project), VRDN, AMT, 1.25% due 4/01/2012 (a) ........... 2,500 California Infrastructure and Economic Development Bank Revenue Refunding Bonds, VRDN (a): 4,100 (Guided Discoveries Inc. Project), 1.05% due 6/01/2032 ...................... 4,100 31,700 (Independent System Operation Corporation Project), Series A, 1.10% due 4/01/2008 (b) ........................................................... 31,700 36,800 (Independent System Operation Corporation Project), Series C, 1.10% due 4/01/2009 (b) ........................................................... 36,800 5,600 California Pollution Control Financing Authority, Environmental Improvement Revenue Bonds (Atlantic Richfield Co. Project), VRDN, AMT, 1.05% due 12/01/2032 (a) ....... 5,600 California Pollution Control Financing Authority, PCR, Refunding (Pacific Gas and Electric), VRDN (a): 143,450 AMT, Series B, 1.18% due 11/01/2026 ......................................... 143,450 158,825 Series C, 1.18% due 11/01/2026 .............................................. 158,825 18,050 Series E, 1.13% due 11/01/2026 .............................................. 18,050 25,505 Series F, 1.13% due 11/01/2026 .............................................. 25,505 24,500 California Pollution Control Financing Authority, Resource Recovery Revenue Bonds (Atlantic Richfield Co. Project), VRDN, Series A, 1.11% due 12/01/2024 (a) ........ 24,500 Portfolio Abbreviations for CMA California Municipal Money Fund AMT Alternative Minimum Tax (subject to) COP Certificates of Participation CP Commercial Paper FLOATS Floating Rate Securities GAN Grant Anticipation Notes GO General Obligation Bonds HFA Housing Finance Authority IDA Industrial Development Authority IDR Industrial Development Revenue Bonds M/F Multi-Family MERLOTS Municipal Extendable Receipt Liquidity Option Tender Securities MSTR Municipal Securities Trust Receipts PCR Pollution Control Revenue Bonds RAN Revenue Anticipation Notes RAW Reserve Anticipation Warrant ROCS Reset Option Certificates S/F Single Family TRAN Tax Revenue Anticipation Notes VRDN Variable Rate Demand Notes 6 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 Schedule of Investments (continued) (in Thousands) Face State Amount Municipal Bonds Value ==================================================================================================================================== California $ 4,000 California Pollution Control Financing Authority, Solid Waste Disposal Revenue (continued) Refunding Bonds (Waste Management Project), VRDN, AMT, Series A, 1.09% due 1/01/2022 (a) ................................................................. $ 4,000 19,075 California Rural Home Mortgage Finance Authority, S/F Mortgage Revenue Refunding Bonds, AMT, 1.123% due 7/25/2004 .................................................. 19,075 California State Department of Water Resources, Power Supply Revenue Bonds (a): 67,308 FLOATS, Series 765, 1.08% due 5/01/2015 (d) ................................. 67,307 28,000 VRDN, Series B-3, 1.13% due 5/01/2022 ....................................... 28,000 5,200 VRDN, Series B-6, 1.15% due 5/01/2022 ....................................... 5,200 32,200 VRDN, Series C-4, 1.07% due 5/01/2022 ....................................... 32,200 14,900 VRDN, Series C-9, 1.10% due 5/01/2022 ....................................... 14,900 15,500 VRDN, Series C-15, 1.05% due 5/01/2022 ...................................... 15,500 1,800 California State Economic Development Financing Authority, IDR (Harvel Plastics Inc. Project), VRDN, AMT, 1.25% due 3/01/2010 (a) ................................. 1,800 10,000 California State, GO, MERLOTS, Series B-45, 1.09% due 10/01/2029 (a) .............. 10,000 California State, GO, MSTR, VRDN (a): 8,555 Series SGA-7, 1.10% due 9/01/2018 (e) ....................................... 8,555 9,600 Series SGA-39, 1.10% due 6/01/2014 (b) ...................................... 9,600 2,990 Series SGA-40, 1.10% due 6/01/2013 (c) ...................................... 2,990 9,370 Series SGA-72, 1.10% due 6/01/2017 (c) ...................................... 9,370 California State, GO, Refunding, MERLOTS (a): 9,145 Series A-17, 1.09% due 2/01/2018 (d) ........................................ 9,145 3,170 Series A-47, 1.09% due 2/01/2011 (b) ........................................ 3,170 California State, GO, Refunding, MSTR, VRDN (a): 7,900 Series SGA-119, 1.13% due 9/01/2028 (c) ..................................... 7,900 20,600 Series SGA-135, 1.13% due 12/01/2030 (d)(g) ................................. 20,600 4,555 Series SGA-136, 1.13% due 12/01/2030 (g) .................................... 4,555 335,000 California State, RAW, Series A, 2% due 6/16/2004 ................................. 337,075 California Statewide Communities Development Authority, M/F Housing Revenue Bonds: 10,000 (Aqua Vista Apartments Project II), AMT, Series J, 1.25% due 11/14/2003 ..... 10,000 10,000 (Canyon Creek Apartments), VRDN, AMT, Series C, 1.15% due 6/15/2025 (a)(f) .. 10,000 4,200 (Kimberly Woods), VRDN, AMT, Series B, 1.15% due 6/15/2025 (a)(f) ........... 4,200 13,205 (Knolls at Green Valley), VRDN, AMT, Series FF, 1.15% due 7/15/2036 (a)(f) .. 13,205 10,375 (More Than Shelter), VRDN, Series A, 1.10% due 1/15/2031 (a) ................ 10,375 15,100 (Oakmont Chino Hills), VRDN, AMT, Series P, 1.15% due 6/01/2036 (a) ......... 15,100 3,285 (Olen Jones Senior Apartments), VRDN, AMT, Series BB, 1.20% due 12/01/2034 (a) 3,285 California Statewide Communities Development Authority Revenue Bonds (Kaiser Permanente), VRDN (a): 11,400 Series A, 1.17% due 10/01/2013 .............................................. 11,400 17,000 Series B, 1.17% due 11/01/2030 .............................................. 17,000 8,000 California Statewide Communities Development Authority, Solid Waste Facilities Revenue Bonds (Chevron U.S.A. Inc. Project), VRDN, AMT, 1.11% due 12/15/2024 (a) .. 8,000 15,000 California Transit Finance Authority Revenue Bonds, VRDN, 1.03% due 10/01/2027 (a)(e) ............................................................. 15,000 20,000 Carlsbad, California, M/F Housing Revenue Bonds (The Greens Apartments), VRDN, AMT, Series A, 1.12% due 6/01/2046 (a) ................................................. 20,000 15,529 Clipper Tax-Exempt Trust, California, COP, VRDN, AMT, Series 98-9, 1.18% due 1/01/2004 (a) ................................................................. 15,529 15,525 Contra Costa, California, Water District Revenue Bonds, MSTR, VRDN, Series SGA 24, 1.10% due 10/01/2019 (a)(b) ....................................................... 15,525 7,170 Contra Costa, California, Water District Water Revenue Refunding Bonds, FLOATS, Series 850, 1.11% due 10/01/2019 (a)(e) ........................................... 7,170 14,500 Contra Costa County, California, M/F Housing Revenue Bonds (Creekview Apartments), VRDN, AMT, Series B, 1.15% due 7/01/2036 (a)(h) ................................... 14,500 5,800 Dublin, California, M/F Housing Authority Revenue Bonds (Park Sierra), VRDN, AMT, Series A, 1.10% due 6/01/2028 (a) ................................................. 5,800 21,000 Eagle Tax-Exempt Trust, California Infrastructure and Economic Development Bank Revenue Bonds, VRDN, Series 2003-0042, Class A, 1.11% due 7/01/2037 (a) ........... 21,000 18,320 Eagle Tax-Exempt Trust, California State Department of Water Resources, Power Supply Revenue Bonds, VRDN, Series 2002-6017, Class A, 1.11% due 5/01/2018 (a)(d) . 18,320 29,700 Eagle Tax-Exempt Trust, California, VRDN, Series 2000-0501, Class A, 1.13% due 10/01/2028 (a) ................................................................ 29,700 4,800 Eagle Tax-Exempt Trust, Los Angeles, California, Unified School District, GO, VRDN, Series 2003-0043, Class A, 1.11% due 1/01/2028 (a) ................................ 4,800 8,975 Fresno, California, Airport Revenue Bonds, MERLOTS, AMT, Series B2, 1.14% due 7/01/2030 (a)(e) .............................................................. 8,975 4,685 Fresno, California, Water System Revenue Refunding Bonds, MSTR, VRDN, Series SGA 76, 1.10% due 6/01/2024 (a)(c) ................................................ 4,685 15,783 Glendale, California, Hospital Revenue Refunding Bonds, FLOATS, Series 590, 1.13% due 3/01/2014 (a)(b) .............................................................. 15,782 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 7 [LOGO] Merrill Lynch Investment Managers Schedule of Investments (continued) (in Thousands) Face State Amount Municipal Bonds Value ==================================================================================================================================== California $ 6,620 Highland, California, Redevelopment Agency, M/F Housing Revenue Bonds (Jeffrey (continued) Court Senior Apartments), VRDN, AMT, 1.10% due 3/01/2028 (a) ...................... $ 6,620 1,735 Kern County, California, Superintendent of Schools, COP, VRDN, Series A, 1.15% due 12/01/2021 (a) ................................................................ 1,735 19,430 Loma Linda, California, M/F Housing Revenue Refunding Bonds (Loma Linda Springs), VRDN, AMT, 1.12% due 12/15/2031 (a) ............................................... 19,430 14,740 Los Angeles, California, Community Redevelopment Agency, M/F Housing Revenue Bonds (Rowan Lofts Project), VRDN, AMT, Series A, 1.15% due 12/01/2034 (a) .............. 14,740 47,000 Los Angeles, California, Convention and Exhibition Center Authority, Lease Revenue Refunding Bonds, Series D, VRDN, 0.97% due 6/16/2004 (a) .......................... 47,000 3,000 Los Angeles, California, Department of Airports, Airport Municipal Trust Revenue Bonds, FLOATS, Series SG 61, 1.14% due 5/15/2020 (a)(c) ........................... 3,000 Los Angeles, California, Department of Water and Power, Electric Plant Revenue Refunding Bonds, MSTR, VRDN (a): 4,075 Series SGA 4, 1.10% due 11/15/2019 (c) ...................................... 4,075 4,005 Series SGA 6, 1.10% due 11/15/2019 (b) ...................................... 4,005 3,120 Los Angeles, California, Department of Water and Power, Waterworks Revenue Refunding Bonds, MERLOTS, Series A24, 1.09% due 7/01/2030 (a)(b) .................. 3,120 5,000 Los Angeles, California, Harbor Department Revenue Bonds, FLOATS, Series SG-59, 1.14% due 8/01/2026 (a)(b) ........................................................ 5,000 Los Angeles, California, Unified School District, GO, MERLOTS (a): 25,000 Series A-22, 1.09% due 7/01/2022 (e) ........................................ 25,000 10,000 Series A-33, 1.09% due 7/01/2028 (c) ........................................ 10,000 4,995 Series B-12, 1.09% due 1/01/2027 (b) ........................................ 4,995 Los Angeles, California, Unified School District, GO, TRAN: 25,000 Series A, 2% due 7/01/2004 .................................................. 25,199 60,000 Series B, 1.50% due 7/01/2004 ............................................... 60,254 Los Angeles, California, Wastewater System Revenue Refunding Bonds, VRDN (a)(c): 12,000 Sub-Series A, 1.25% due 12/01/2031 .......................................... 12,000 16,000 Sub-Series B, 1.25% due 12/01/2031 .......................................... 16,000 Los Angeles, California, Water and Power Revenue Refunding Bonds, ROCS (a)(b): 6,890 Series II-R-4510, 1.11% due 7/01/2021 ....................................... 6,890 10,505 Series II-R-5013, 1.11% due 7/01/2021 ....................................... 10,505 22,630 Los Angeles County, California, Capital Asset (LSG Corp.), Lease Revenue Tax-Exempt, CP, 0.87% due 10/10/2003 .......................................................... 22,630 13,100 Los Angeles County, California, Housing Authority, M/F Housing Revenue Bonds (Park Sierra), VRDN, Series A, 1.10% due 9/01/2030 (a) .................................. 13,100 Los Angeles County, California, Metropolitan Transportation Authority, Revenue Refunding Bonds, MSTR, VRDN (a)(e): 40,000 Series SGB 1, 1.11% due 7/01/2025 ........................................... 40,000 40,850 Series SGB 2, 1.11% due 7/01/2021 ........................................... 40,850 6,000 Los Angeles County, California, Metropolitan Transportation Authority, Sales Tax Revenue Bonds, FLOATS, Series SG-46, 1.11% due 7/01/2017 (a)(d) ................... 6,000 20,000 Milpitas, California, M/F Housing Revenue Bonds (Crossing at Montague), VRDN, AMT, Series A, 1.15% due 8/15/2033 (a)(f) .............................................. 20,000 7,435 Monrovia, California, Unified School District, GO, MSTR, VRDN, Series SGA 70, 1.10% due 8/01/2022 (a)(b) .............................................................. 7,435 Municipal Securities Trust Certificates, California, GO, VRDN, Class A (a)(c): 24,550 Series 2000-97, 1.10% due 9/01/2016 ......................................... 24,550 20,860 Series 2001-118, 1.13% due 3/03/2009 ........................................ 20,860 6,010 National City, California, Community Development Commission, Tax Allocation Revenue Bonds (Redevelopment Project), VRDN, Series B, 1.10% due 8/01/2025 (a) ............ 6,010 Newport Beach, California, Revenue Bonds (Hoag Memorial Presbyterian Hospital), VRDN (a): 12,500 Series A, 1.13% due 12/01/2029 .............................................. 12,500 20,000 Series C, 1.13% due 12/01/2029 .............................................. 20,000 8,995 Palmdale, California, COP, ROCS, Series II-R-200, 1.11% due 9/01/2032 (a)(b) ...... 8,995 14,200 Peninsula Corridor, California, Joint Powers Board Revenue Bonds, GAN, Series C, 1.45% due 9/03/2004 ............................................................... 14,242 13,570 Port Oakland, California, Port Revenue Bonds, MSTR, VRDN, Series SG 112, 1.15% due 11/01/2025 (a)(b) ............................................................. 13,570 13,450 Port Oakland, California, Revenue Refunding Bonds, MERLOTS, AMT, Series B-36, 1.14% due 11/01/2021 (a)(c) ............................................................. 13,450 5,000 Rescue, California, Union School District, COP, VRDN, 1.08% due 10/01/2025 (a)(e) . 5,000 3,300 Riverside County, California, IDA, IDR (Universal Forest Products), VRDN, AMT, 1.14% due 8/01/2029 (a) ........................................................... 3,300 Sacramento, California, Housing Authority, M/F Housing Revenue Bonds, VRDN, AMT (a): 12,200 (Greenfair Apartments), Series G, 1.20% due 12/01/2030 ...................... 12,200 15,490 (Lofts at Natomas Apartments), Series F, 1.15% due 4/15/2036 (f) ............ 15,490 5,760 Sacramento, California, Municipal Utility District, Electric Revenue Bonds, MSTR, VRDN, Series SGB 4, 1.11% due 8/15/2021 (a)(d) .................................... 5,760 8 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 Schedule of Investments (concluded) (in Thousands) Face State Amount Municipal Bonds Value ==================================================================================================================================== California Sacramento, California, Municipal Utility District, Electric Revenue Refunding (concluded) Bonds (a)(e): $ 12,910 FLOATS, Series 748, 1.11% due 8/15/2028 ..................................... $ 12,910 9,400 MSTR, VRDN, Series SGA 5, 1.10% due 11/15/2006 .............................. 9,400 6,355 Sacramento County, California, COP, ROCS, Series II-R-5007, 1.11% due 12/01/2023 (a)(d) ............................................................. 6,355 10,000 San Bernardino County, California, COP, Refunding (Medical Center Financing Project), VRDN, 1.11% due 8/01/2026 (a)(b) ........................................ 10,000 10,000 San Diego, California, County and School District RAN, Series B, 1.75% due 6/30/2004 ..................................................................... 10,062 7,000 San Diego, California, Sewer Revenue Bonds, FLOATS, Series SG 14, 1.11% due 5/15/2020 (a)(d) .............................................................. 7,000 San Diego, California, United Port District, CP, Series A: 22,134 AMT, 1.10% due 11/03/2003 ................................................... 22,134 20,160 1.05% due 11/03/2003 ........................................................ 20,160 San Francisco, California, City and County Airport Commission, International Airport Revenue Bonds, MSTR, VRDN (a): 7,705 AMT, Series SGA-56, 1.13% due 5/01/2026 (b) ................................. 7,705 28,005 Series SG-115, 1.20% due 5/01/2020 (c) ...................................... 28,005 16,555 Series SG-116, 1.20% due 5/01/2026 (b) ...................................... 16,555 5,610 San Joaquin County, California, COP, ROCS, Series II-R-2030, 1.11% due 4/01/2020 (a)(b) .................................................................. 5,610 2,690 San Jose, California, Airport Revenue Refunding Bonds, ROCS, Series II-R-2004, 1.11% due 3/01/2016 (a)(e) ........................................................ 2,690 San Jose, California, M/F Housing Revenue Bonds, VRDN (a): 12,000 (Carlton Homes), AMT, Series A, 1.12% due 10/15/2032 ........................ 12,000 26,400 (Siena Renaissance Square Apartments), 1.15% due 12/01/2029 ................. 26,400 9,935 Santa Clara, California, Electric Revenue Refunding Bonds, MSTR, VRDN, Series SGA-75, 1.10% due 7/01/2027 (a)(d) ................................................ 9,935 3,230 Shafter, California, IDA, IDR (Building Materials Manufacturing Corporation Project), VRDN, AMT, 1.10% due 6/01/2029 (a) ...................................... 3,230 Simi Valley, California, M/F Housing Revenue Bonds, VRDN (a): 12,500 (Parker Ranch Project), AMT, Series A, 1.15% due 7/15/2036 .................. 12,500 12,000 (Shadowridge Apartments), 1.15% due 9/01/2019 ............................... 12,000 2,670 University of California Revenue Bonds, ROCS, Series II-R-3007, 1.11% due 9/01/2020 (a)(e) .................................................................. 2,670 8,800 Upland, California, Apartment Development Revenue Refunding Bonds (Mountain Springs--Issue A), VRDN, 1.10% due 11/15/2028 (a)(f) .............................. 8,800 17,800 Ventura County, California, Public Finance Authority, Lease Revenue Bonds (Series 1998), CP, 0.87% due 10/09/2003 ................................................... 17,800 ==================================================================================================================================== Puerto Rico--1.7% 4,900 Municipal Securities Trust Certificates, Puerto Rico, Revenue Bonds, VRDN, Series 2000-107, Class A, 1.05% due 5/19/2009 (a)(e) ..................................... 4,900 4,000 Puerto Rico Commonwealth, FLOATS, Series PMD-8, 1.05% due 7/01/2026 (a)(b) ........ 4,000 3,450 Puerto Rico Commonwealth, Highway and Transportation Authority, Transportation Revenue Bonds, FLOATS, Series PMD-9, 1.05% due 7/01/2026 (a)(e) ................... 3,450 8,635 Puerto Rico Electric Power Authority, Power Revenue Bonds, MSTR, VRDN, Series SGA 44, 1.05% due 7/01/2023 (a)(b) ................................................ 8,635 Puerto Rico, Government Development Bank, CP: 11,606 0.85% due 11/06/2003 ........................................................ 11,606 11,028 1% due 12/03/2003 ........................................................... 11,028 ==================================================================================================================================== Total Investments (Cost--$2,570,813*)--99.8% ...................................... 2,570,813 Other Assets Less Liabilities--0.2% ............................................... 5,470 ---------- Net Assets--100.0% ................................................................ $2,576,283 ========== (a) The interest rate is subject to change periodically based upon prevailing market rates. The interest rate shown is the rate in effect at September 30, 2003. (b) MBIA Insured. (c) FGIC Insured. (d) AMBAC Insured. (e) FSA Insured. (f) FNMA Collateralized. (g) XL Capital Insured. (h) FHLMC Collateralized. * Cost for Federal income tax purposes. See Notes to Financial Statements. CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 9 [LOGO] Merrill Lynch Investment Managers Statement of Assets and Liabilities As of September 30, 2003 ================================================================================================================================== Assets - ---------------------------------------------------------------------------------------------------------------------------------- Investments, at value (identified cost--$2,570,813,255) ................ $ 2,570,813,255 Cash ................................................................... 421,303 Interest receivable .................................................... 5,855,371 Prepaid registration fees and other assets ............................. 61,117 --------------- Total assets ........................................................... 2,577,151,046 --------------- ================================================================================================================================== Liabilities - ---------------------------------------------------------------------------------------------------------------------------------- Payables: Distributor ......................................................... $ 653,245 Investment adviser .................................................. 117,816 Other affiliates .................................................... 94,315 Beneficial interest redeemed ........................................ 2,779 --------------- Total liabilities ...................................................... 868,155 --------------- Net Assets ............................................................. $ 2,576,282,891 =============== ================================================================================================================================== Net Assets Consist of - ---------------------------------------------------------------------------------------------------------------------------------- Shares of beneficial interest, $.10 par value, unlimited number of shares authorized .................................................... $ 257,677,693 Paid-in capital in excess of par ....................................... 2,318,724,024 Accumulated realized capital losses--net ............................... (118,826) --------------- Net Assets--Equivalent to $1.00 per share based on 2,576,776,931 shares of beneficial interest outstanding ................................... $ 2,576,282,891 =============== See Notes to Financial Statements. 10 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 Statement of Operations For the Six Months Ended September 30, 2003 ================================================================================================================================== Investment Income - ---------------------------------------------------------------------------------------------------------------------------------- Interest and amortization of premium and discount earned ............... $ 14,368,704 ================================================================================================================================== Expenses - ---------------------------------------------------------------------------------------------------------------------------------- Investment advisory fees ............................................... $ 5,402,177 Distribution fees ...................................................... 1,641,003 Accounting services .................................................... 190,452 Transfer agent fees .................................................... 97,755 Custodian fees ......................................................... 35,376 Professional fees ...................................................... 34,222 Printing and shareholder reports ....................................... 22,121 Registration fees ...................................................... 15,679 Trustees' fees and expenses ............................................ 11,457 Pricing fees ........................................................... 8,620 Other .................................................................. 17,929 --------------- Total expenses ......................................................... 7,476,791 --------------- Investment income--net ................................................. 6,891,913 Realized Gain on Investments--Net ...................................... 104,837 --------------- Net Increase in Net Assets Resulting from Operations ................... $ 6,996,750 =============== See Notes to Financial Statements. CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 11 [LOGO] Merrill Lynch Investment Managers Statements of Changes in Net Assets For the Six For the Months Ended Year Ended September 30, March 31, Increase (Decrease) in Net Assets: 2003 2003 ================================================================================================================================== Operations - ---------------------------------------------------------------------------------------------------------------------------------- Investment income--net ................................................. $ 6,891,913 $ 22,521,346 Realized gain on investments--net ...................................... 104,837 37,457 ----------------------------------- Net increase in net assets resulting from operations ................... 6,996,750 22,558,803 ----------------------------------- ================================================================================================================================== Dividends to Shareholders - ---------------------------------------------------------------------------------------------------------------------------------- Dividends to shareholders from investment income--net .................. (6,891,913) (22,521,346) ----------------------------------- ================================================================================================================================== Beneficial Interest Transactions - ---------------------------------------------------------------------------------------------------------------------------------- Net proceeds from sale of shares ....................................... 4,933,637,854 7,783,871,053 Value of shares issued to shareholders in reinvestment of dividends .... 6,891,327 22,522,100 ----------------------------------- 4,940,529,181 7,806,393,153 Cost of shares redeemed ................................................ (5,031,202,130) (7,854,465,498) ----------------------------------- Net decrease in net assets derived from beneficial interest transactions (90,672,949) (48,072,345) ----------------------------------- ================================================================================================================================== Net Assets - ---------------------------------------------------------------------------------------------------------------------------------- Total decrease in net assets ........................................... (90,568,112) (48,034,888) Beginning of period .................................................... 2,666,851,003 2,714,885,891 ----------------------------------- End of period .......................................................... $ 2,576,282,891 $ 2,666,851,003 =================================== See Notes to Financial Statements. 12 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 Financial Highlights The following per share data and ratios have been derived For the Six from information provided in the financial statements. Months Ended For the Year Ended March 31, September 30, -------------------------------------------------------- Increase (Decrease) in Net Asset Value: 2003 2003 2002 2001 2000 =================================================================================================================================== Per Share Operating Performance - ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period ..... $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ----------------------------------------------------------------------- Investment income--net ................... --+ .01 .02 .03 .03 Realized gain (loss) on investments--net . --+ --+ --+ --++ --+ ----------------------------------------------------------------------- Total from investment operations ......... --+ .01 .02 .03 .03 ----------------------------------------------------------------------- Less dividends from investment income--net --++ (.01) (.02) (.03) (.03) ----------------------------------------------------------------------- Net asset value, end of period ........... $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ======================================================================= Total Investment Return .................. .52%* .85% 1.61% 3.02% 2.59% ======================================================================= =================================================================================================================================== Ratios to Average Net Assets - ----------------------------------------------------------------------------------------------------------------------------------- Expenses ................................. .56%* .57% .57% .58% .58% ======================================================================= Investment income--net ................... .52%* .85% 1.58% 2.98% 2.56% ======================================================================= =================================================================================================================================== Supplemental Data - ----------------------------------------------------------------------------------------------------------------------------------- Net assets, end of period (in thousands) . $ 2,576,283 $ 2,666,851 $ 2,714,886 $ 2,429,174 $ 2,312,154 ======================================================================= * Annualized. + Amount is less than $.01 per share. ++ Amount is less than $(.01) per share. See Notes to Financial Statements. CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 13 [LOGO] Merrill Lynch Investment Managers Notes to Financial Statements 1. Significant Accounting Policies: CMA California Municipal Money Fund (the "Fund") is part of CMA 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 a normal, recurring nature. The following is a summary of significant accounting policies followed by the Fund. (a) Valuation of investments -- Investments are valued at amortized cost, which approximates market value. For the purpose of valuation, the maturity of a variable rate demand instrument is deemed to be the demand notice payment period. In the case of a floating rate instrument, the remaining maturity is the next coupon date on which the interest rate is to be adjusted. (b) 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. (c) 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. Interest income (including amortization of premium and discount) is recognized on the accrual basis. (d) Prepaid registration fees -- Prepaid registration fees are charged to expense as the related shares are issued. (e) Dividends and distributions to shareholders -- The Fund declares dividends daily and reinvests daily such dividends (net of non-resident alien tax withheld and backup withholding tax withheld) in additional fund shares at net asset value. Dividends are declared from the total of net investment income, excluding discounts earned other than original issue discounts. Net realized capital gains, if any, are normally distributed annually after deducting prior years' loss carryforward. The Fund may distribute capital gains more frequently than annually in order to maintain the Fund's net asset value at $1.00 per share. (f) 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. 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: .50% of the first $500 million of average daily net assets; .425% of average daily net assets in excess of $500 million but not exceeding $1 billion, and .375% of average daily net assets in excess of $1 billion. Pursuant to the Distribution and Shareholder Servicing Plan in compliance with Rule 12b-1 under the Investment Company Act of 1940, Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S") receives a distribution fee from the Fund at the end of each month at the annual rate of .125% of average daily net assets of the Fund. The distribution fee is to compensate MLPF&S financial advisors and other directly involved branch office personnel for selling shares of the Fund and for providing direct personal services to shareholders. The distribution fee is not compensation for the administrative and operational services rendered to the Fund by MLPF&S in processing share orders and administering shareholder accounts. 14 CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 Notes to Financial Statements (concluded) Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of ML & Co., is the Fund's transfer agent. For the six months ended September 30, 2003, the Fund reimbursed FAM $28,376 for certain accounting services. Certain officers and/or trustees of the Fund are officers and/or directors of FAM, PSI, FDS, and/or ML & Co. 3. Shares of Beneficial Interest: The number of shares sold, reinvested and redeemed during the periods corresponds to the amounts included in the Statements of Changes in Net Assets for net proceeds from sale of shares, value of shares reinvested and cost of shares redeemed, respectively, since shares are recorded at $1.00 per share. 4. Capital Loss Carryforward: On March 31, 2003, the Fund had a net capital loss carryforward of $223,405, of which $41,791 expires in 2006 and $181,614 expires in 2009. This amount will be available to offset like amounts of any future taxable gains. CMA CALIFORNIA MUNICIPAL MONEY FUND SEPTEMBER 30, 2003 15 [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. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. Past performance results shown in this report should not be considered a representation of future performance, which will fluctuate. Statements and other information herein are as dated and are subject to change. CMA California Municipal Money Fund of CMA Multi-State Municipal Series Trust Box 9011 Princeton, NJ 08543-9011 #11211 -- 9/03 Item 2 - Did registrant adopt a code of ethics, as of the end of the period covered by this report, that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party? If not, why not? Briefly describe any amendments or waivers that occurred during the period. State here if code of ethics/amendments/waivers are on website and give website address-. State here if fund will send code of ethics to shareholders without charge upon request-- N/A (annual requirement only) Item 3 - Did the registrant's board of directors determine that the registrant either: (i) has at least one audit committee financial expert serving on its audit committee; or (ii) does not have an audit committee financial expert serving on its audit committee? If yes, disclose name of financial expert and whether he/she is "independent," (fund may, but is not required, to disclose name/independence of more than one financial expert) If no, explain why not. - N/A (annual requirement only) Item 4 - Disclose annually only (not answered until December 15, 2003) (a) Audit Fees - Disclose aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. N/A. (b) Audit-Related Fees - Disclose aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A. (c) Tax Fees - Disclose aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A. (d) All Other Fees - Disclose aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A. (e)(1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. N/A. (e)(2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. N/A. (f) If greater than 50%, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A. (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. N/A. (h) Disclose whether the registrant's audit committee has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another 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. N/A. Item 5 - If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act, state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act. If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrant's audit committee in Section 3(a)(58)(B) of the Exchange Act, so state. If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act regarding an exemption from the listing standards for audit committees. N/A (Listed issuers must be in compliance with the new listing rules by the earlier of their first annual shareholders meeting after January 2004, or October 31, 2004 (annual requirement)) Item 6 - Reserved Item 7 - For closed-end funds that contain voting securities in their portfolio, describe the policies and procedures that it uses to determine how to vote proxies relating to those portfolio securities. N/A Item 8 -- Reserved Item 9(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. Item 9(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 10 - Exhibits 10(a) - Attach code of ethics or amendments/waivers, unless code of ethics or amendments/waivers is on website or offered to shareholders upon request without charge. N/A. 10(b) - Attach certifications pursuant to Section 302 of the Sarbanes-Oxley Act. 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. CMA California Municipal Money Fund of CMA Multi-State Municipal Series Trust By: /s/ Terry K. Glenn ---------------------------- Terry K. Glenn, President of CMA California Municipal Money Fund of CMA Multi-State Municipal Series Trust Date: November 21, 2003 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 CMA California Municipal Money Fund of CMA Multi-State Municipal Series Trust Date: November 21, 2003 By: /s/ Donald C. Burke ---------------------------- Donald C. Burke, Chief Financial Officer of CMA California Municipal Money Fund of CMA Multi-State Municipal Series Trust Date: November 21, 2003 Attached hereto as a furnished exhibit are the certifications pursuant to Section 906 of the Sarbanes-Oxley Act.