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 811-5850 811-10171 Name of Fund: Merrill Lynch Senior Floating Rate Fund, Inc. Master Senior Floating Rate Trust Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Terry K. Glenn, President, Merrill Lynch Senior Floating Rate Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011 Registrant's telephone number, including area code: (609) 282-2800 Date of fiscal year end: 08/31/04 Date of reporting period: 09/01/03 - 02/29/04 Item 1 - Report to Stockholders (BULL LOGO) Merrill Lynch Investment Managers www.mlim.ml.com Merrill Lynch Senior Floating Rate Fund, Inc. Semi-Annual Report February 29, 2004 Merrill Lynch Senior Floating Rate Fund, Inc. seeks as high a level of current income and such preservation of capital as is consistent with investment in senior collateralized corporate loans made by banks and other financial institutions. This report, including the financial information herein, is transmitted for use only to the shareholders of Merrill Lynch Senior Floating Rate Fund, Inc. for their information. It is not a prospectus, circular or representation intended for use in the purchase of shares of the Fund or any securities mentioned in this report. Past performance results shown in this report should not be considered a representation of future performance. 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 Senior Floating Rate Fund, Inc. Box 9011 Princeton, NJ 08543-9011 (GO PAPERLESS LOGO) It's Fast, Convenient, & Timely! To sign up today, go to www.icsdelivery.com/live. Merrill Lynch Senior Floating Rate Fund, Inc. Officers and Directors/Trustees Terry K. Glenn, President and Director/Trustee Ronald W. Forbes, Director/Trustee Cynthia A. Montgomery, Director/Trustee Kevin A. Ryan, Director/Trustee Roscoe S. Suddarth, Director/Trustee Richard R. West, Director/Trustee Edward D. Zinbarg, Director/Trustee Kevin J. Booth, Vice President Joseph P. Matteo, Vice President Donald C. Burke, Vice President and Treasurer Phillip S. Gillespie, Secretary Charles R. Reilly, Director/Trustee of Merrill Lynch Senior Floating Rate Fund, Inc., has recently retired. The Fund's Board of Directors/Trustees wishes Mr. Reilly well in his retirement. Custodian The Bank of New York 100 Church Street New York, NY 10286 Transfer Agent Financial Data Services, Inc. 4800 Deer Lake Drive East Jacksonville, FL 32246-6484 800-637-3863 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 A Letter From the President Dear Shareholder As I write to you at February month-end, fixed income markets in the United States continued to reward those investors willing to accept greater risk. The high yield market, as measured by the Credit Suisse First Boston High Yield Index, provided a return of +10.88% over the past six months and +25.17% for the 12-month period ended February 29, 2004. In other areas of fixed income, investment grade corporate bonds, as measured by the Merrill Lynch Corporate Master Index, returned +6.59% and +8.11% for the six-month and 12-month periods ended February 29, 2004, respectively. Treasury issues, as measured by the Merrill Lynch U.S. Treasuries 1-10 Years Index, returned +3.16% and +2.73% for the six-month and 12-month periods ended February 29, 2004, respectively. At the same time, equity markets maintained their positive momentum from year-end 2003. For the six-month and 12-month periods ended February 29, 2004, Standard & Poor's (S&P) 500 Index returned +14.59% and +38.52%, respectively. Much of the boost came from improving economic conditions in the United States. The major signposts as we enter 2004 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, was 4.1% in the fourth quarter. A similar level of growth is expected 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 February 10, 2004, 392 of the S&P 500 companies had reported their fourth-quarter 2003 results, and 67.6% 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 this year. At Merrill Lynch Investment Managers, we believe the events and efforts of 2003 left us with a much stronger economy and that 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 startegy 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, (Terry K. Glenn) Terry K. Glenn President and Director/Trustee MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 A Discussion With Your Fund's Portfolio Managers The Fund participated in an aggressive rally in the leveraged loan market, and ended the period with a total return exceeding that of the benchmark CSFB Leveraged Loan Index How did the Fund perform during the six-month period? For the six-month period ended February 29, 2004, the Common Stock of Merrill Lynch Senior Floating Rate Fund, Inc. had a net annualized yield of 3.74%, based on a period-end per share net asset value of $8.84 and $.165 per share income dividends. Over the same period, the total investment return on the Fund's Common Stock was +7.23%, based on a change in per share net asset value from $8.40 to $8.84, and assuming reinvestment of $.165 per share ordinary income dividends. These results compare to the +4.68% total return of the Credit Suisse First Boston (CSFB) Leveraged Loan Index for the same period. The increase in the mark-to-market valuation of the portfolio, combined with the current income being distributed, led to a total return that significantly outpaced that of the benchmark CSFB Leveraged Loan Index. What were the primary market and economic developments that affected the Fund? In our last report to shareholders, we noted that the leveraged loan market's positive momentum had declined following a monthly return peak of +1.41% in April 2003. That period ended on August 31, 2003 with an August monthly return of +.21%. In this six-month period ended February 29, 2004, market returns rebounded from August's relative low point, although the high April 2003 monthly return was not surpassed. In the past six months, inflows into the loan market via new collateralized debt obligations, prime funds and hedge funds exceeded the amount of new issues coming to market. This helped to maintain a strong bid on loans in the secondary market as loan managers competed to put their cash to work. In the primary market, pricing was equally competitive with market participants routinely receiving new-issue allocation amounts well below their commitment levels. Adding to the levels of cash held by loan managers was a steady stream of refinancings. The refinancing activity was initiated by issuers seeking to take advantage of the new lower market spreads, which had steadily dropped throughout the period. According to Standard & Poor's (S&P) Leveraged Commentary and Data, the new-issue spread for BB/BB- institutional loans was 235 basis points (2.35%) in February 2004, compared to 295 basis points in September 2003. For B/B+ loans, the spread was 294 basis points in February 2004 versus 350 basis points in September 2003. A steady decline in the default rate over the past year also contributed to investor demand for the leveraged loan asset class. For example, the lagging 12-month default rate for the S&P/LSTA Leveraged Loan Index was 1.61% on February 29, 2004 versus 2.91% on September 30, 2003 and 5.01% on February 28, 2003. The floating rate nature of leveraged loans also has been a desired feature among those investors seeking to add an interest-rate-defensive position to their portfolio in anticipation of a Federal Reserve Board move to increase interest rates. What changes were made to the portfolio during the period? From a sector perspective, we continued to emphasize those industries with strong asset values and stable cash flow characteristics. Our highest concentration remained in cable--U.S., followed by wireless communications, utilities, chemicals and service. The continued rally in cable television, which bottomed out in 2002, provided a significant amount of the price appreciation performance in this period. In fact, much of the positive impact during the period was still attributable to the sectors that hurt performance in 2002. These included those sectors in which we traditionally have favored and benefited from an overweighting, such as cable television, utilities and wireless communications. Our investment hypothesis has been that these are strong cash-flowing industries with significant underlying asset values. We believe their market prices suffered in 2002 either for technical reasons, such as fallout from corporate scandals from isolated pockets of the sector, or from too much total leverage (rather than senior leverage), or from a combination. Our investment thesis followed that as the tide of technical price pressures ebbed, our senior, secured positions in these companies would regain their price footing. The performance of these sectors, in particular, has validated our strategy of weathering the storm and holding our positions. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 How would you characterize the portfolio's position at the close of the period? At period end, Master Senior Floating Rate Trust, of which the Fund invests all of its assets, was comprised of 147 issuers spread among 32 industries. Compared to the CSFB Leveraged Loan Index as of the same date, the Trust was underweight Ba and above issues (40.3% versus 48.9% for the Index), overweight B (38.5% versus 30.23%), overweight Caa or below (8.4% versus 6.3%) and underweight not rated issues (13% versus 14.6%). It should be noted that approximately half of our overweight in Caa or below issues is attributable to positions in the Adelphia Communications family of names. Despite the fact that Adelphia has been in bankruptcy for more than a year, its strong assets and associated cash flow has allowed the company to continue to fully service its bank loan interest obligations and has kept the loans trading like paper of a much higher rating quality. In addition, if we include the Trust's positions in high- quality cash equivalents, the distribution is as follows: Ba and above, 41.9%; B, 38.5%; Caa or below, 13.5%; and Not Rated, 6.1%. Overall, the Fund took part in an aggressive rally in the leveraged loan market during the six-month period. The rally, however, has led to a refinancing boom that has resulted in lower spreads and more cash being put into the hands of loan managers. Given the prepayable nature of loans, it is unlikely that there will be a significant amount of additional price appreciation based on their current trading levels. This, combined with lower spreads on new-issue loans, will likely lead to a moderation in the monthly total return percentages over the next period. Given this challenging secondary and new-issue market, we remain vigilant in our analysis of the structure and terms of potential leveraged loan investments. Kevin J. Booth Vice President and Portfolio Manager Joseph P. Matteo Vice President and Portfolio Manager March 26, 2004 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Statements of Assets and Liabilities Merrill Lynch Senior Floating Rate Fund, Inc. As of February 29, 2004 Assets Investment in Master Senior Floating Rate Trust, at value (identified cost--$862,694,054) $ 781,125,058 Prepaid registration fees 385,602 --------------- Total assets 781,510,660 --------------- Liabilities Payables: Dividends to shareholders $ 864,136 Other affiliates 169,500 Administrator 149,565 1,183,201 --------------- Accrued expenses 152,203 --------------- Total liabilities 1,335,404 --------------- Net Assets Net assets $ 780,175,256 =============== Net Assets Consist of Common Stock, par value $.10 per share; 1,000,000,000 shares authorized $ 8,824,433 Paid-in capital in excess of par 1,153,868,979 Accumulated distributions in excess of investment income--net $ (103,485) Accumulated realized capital losses on investments allocated from the Trust--net (300,845,675) Unrealized depreciation on investments allocated from the Trust--net (81,568,996) --------------- Total accumulated losses--net (382,518,156) --------------- Net Assets--Equivalent to $8.84 per share based on 88,244,334 shares of capital stock outstanding $ 780,175,256 =============== See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Statement of Operations Merrill Lynch Senior Floating Rate Fund, Inc. For the Six Months Ended February 29, 2004 Investment Income Allocated from the Trust--Net Net investment income allocated from the Trust: Interest (including $551,776 from affiliates) $ 20,080,726 Facility and other fees 362,180 Expenses (3,912,155) --------------- Net investment income allocated from the Trust 16,530,751 --------------- Expenses Administration fees $ 967,831 Transfer agent fees 363,888 Tender offer fees 250,191 Printing and shareholder reports 45,211 Registration fees 19,562 Professional fees 9,216 Other 5,789 --------------- Total expenses 1,661,688 --------------- Investment income--net 14,869,063 --------------- Realized & Unrealized Gain (Loss) on Investments Allocated from the Trust--Net Realized loss on investments allocated from the Trust--net (28,078,553) Change in unrealized depreciation on investments allocated from the Trust--net 67,485,526 --------------- Total realized and unrealized gain on investments allocated from the Trust--net 39,406,973 --------------- Net Increase in Net Assets Resulting from Operations $ 54,276,036 =============== See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Statements of Changes in Net Assets Merrill Lynch Senior Floating Rate Fund, Inc. For the Six For the Months Ended Year Ended February 29, August 31, Increase (Decrease) in Net Assets: 2004 2003++ Operations Investment income--net $ 14,869,063 $ 41,897,085 Realized loss on investments and allocated from the Trust--net (28,078,553) (36,800,954) Change in unrealized depreciation on investments allocated from the Trust--net 67,485,526 70,358,217 --------------- --------------- Net increase in net assets resulting from operations 54,276,036 75,454,348 --------------- --------------- Dividends to Shareholders Investment income--net (14,758,132) (43,357,390) --------------- --------------- Net decrease in net assets resulting from dividends to shareholders (14,758,132) (43,357,390) --------------- --------------- Capital Share Transactions Net decrease in net assets derived from capital share transactions (57,662,329) (297,760,644) --------------- --------------- Net Assets Total decrease in net assets (18,144,425) (265,663,686) Beginning of period 798,319,681 1,063,983,367 --------------- --------------- End of period* $ 780,175,256 $ 798,319,681 =============== =============== *Accumulated distributions in excess of investment income--net $ (103,485) $ (214,416) =============== =============== ++On February 10, 2003, the Fund converted from a stand-alone investment company to a "feeder" fund that seeks to achieve its investment objective by investing all of its assets in the Trust, which has the same investment objective as the Fund. All investments are made at the Trust level. This structure is sometimes called a "master/feeder" structure. See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Financial Highlights Merrill Lynch Senior Floating Rate Fund, Inc. For the Six The following per share data and ratios have been derived Months Ended from information provided in the financial statements. February 29, For the Year Ended August 31, Increase (Decrease) in Net Asset Value: 2004 2003+++++ 2002 2001 2000 Per Share Operating Performance Net asset value, beginning of period $ 8.40 $ 8.05 $ 8.82 $ 9.45 $ 9.73 ---------- ---------- ---------- ---------- ---------- Investment income--net .16*** .38 .43 .79 .77 Realized and unrealized gain (loss) on investments and allocated from the Trust--net .44 .36 (.77) (.62) (.28) ---------- ---------- ---------- ---------- ---------- Total from investment operations .60 .74 (.34) .17 .49 ---------- ---------- ---------- ---------- ---------- Less dividends from investment income--net (.16) (.39) (.43) (.80) (.77) ---------- ---------- ---------- ---------- ---------- Net asset value, end of period $ 8.84 $ 8.40 $ 8.05 $ 8.82 $ 9.45 ========== ========== ========== ========== ========== Total Investment Return** Based on net asset value per share 7.23%+++ 9.61% (4.09%) 1.52% 5.44% ========== ========== ========== ========== ========== Ratios to Average Net Assets Expenses, excluding interest expense++ 1.44%* 1.45% 1.41% 1.36% 1.31% ========== ========== ========== ========== ========== Expenses++ 1.44%* 1.46% 1.41% 1.36% 1.31% ========== ========== ========== ========== ========== Investment income--net 3.84%* 4.81% 5.07% 8.39% 8.17% ========== ========== ========== ========== ========== Leverage Average amount of borrowings during the period (in thousands) -- $8,138++++ $ 3,374 -- -- ========== ========== ========== ========== ========== Average amount of borrowings per share during the period -- $ .07++++ $ .02 -- -- ========== ========== ========== ========== ========== Supplemental Data Net assets, end of period (in thousands) $ 780,175 $ 798,320 $1,063,983 $1,778,295 $2,492,591 ========== ========== ========== ========== ========== Portfolio turnover from the Trust 31.37% 56.56% 89.46% 50.82% 59.59% ========== ========== ========== ========== ========== *Annualized. **Total investment returns exclude the early withdrawal charge, if any. The Fund is a continuously offered closed-end fund, the shares of which are offered at net asset value. No secondary market for the Fund's shares exists. If applicable, the Fund's investment adviser waived a portion of its management fee. Without such waiver, the Fund's returns would have been lower. ***Based on average shares outstanding. ++Includes the Fund's share of the Trust's allocated expenses. ++++Reflects the average amount of borrowings of the Fund prior to the Fund's conversion from a stand-alone investment company to a "feeder" fund on February 10, 2003. +++Aggregate total investment return. +++++On February 10, 2003, the Fund converted from a stand-alone investment company to a "feeder" fund that seeks to achieve its investment objective by investing all of its assets in the Trust, which has the same investment objective as the Fund. All investments are made at the Trust level. This structure is sometimes called a "master/feeder" structure. See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Notes to Financial Statements Merrill Lynch Senior Floating Rate Fund, Inc. 1. Significant Accounting Policies: Merrill Lynch Senior Floating Rate Fund, Inc. (the "Fund") is registered under the Investment Company Act of 1940, as amended, as a continuously offered, non-diversified, closed-end management investment company. The Fund seeks to achieve its investment objective by investing all of its assets in the Master Senior Floating Rate Trust (the "Trust"), which has the same investment objective as the Fund. The value of the Fund's investment in the Trust reflects the Fund's proportionate interest in the net assets of the Trust. The performance of the Fund is directly affected by the performance of the Trust. The financial statements of the Trust, including the Schedule of Investments, are included elsewhere in this report and should be read in conjunction with the Fund's financial statements. 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 percentage of the Trust owned by the Fund at February 29, 2004 was 80.8%. The following is a summary of significant accounting policies followed by the Fund. (a) Valuation of investments--The Fund records its investment in the Trust at fair value. Valuation of securities held by the Trust is discussed in Note 1a of the Trust's Notes to Financial Statements, which are included elsewhere in this report. (b) Investment income and expenses--The Fund records daily its proportionate share of the Trust's income, expenses and realized and unrealized gains and losses. In addition, the Fund accrues its own expenses. (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 shareholders. Therefore, no Federal income tax provision is required. (d) Prepaid registration fees--Prepaid registration fees are charged to expense as the related shares are issued. (e) 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. (f) Investment transactions--Investment transactions in the Trust are accounted for on a trade date basis. 2. Transactions with Affiliates: The Fund has entered into an Administration 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 pays a monthly fee at an annual rate of ..25% of the Fund's average daily net assets for the performance of administrative services (other than investment advice and related portfolio activities) necessary for the operation of the Fund. Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of ML & Co., is the Fund's transfer agent. For the six months ended February 29, 2004, FAM Distributors, Inc. ("FAMD"), a wholly-owned subsidiary of Merrill Lynch Group, Inc., earned early withdrawal charges of $78,585 relating to the tender of the Fund's shares. Certain officers and/or directors of the Fund are officers and/or directors of FAM, PSI, FAMD, FDS, and/or ML & Co. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Notes to Financial Statements (concluded) Merrill Lynch Senior Floating Rate Fund, Inc. 3. Capital Share Transactions: Transactions in capital shares were as follows: For the Six Months Dollar Ended February 29, 2004 Shares Amount Shares sold 2,989,424 $ 25,890,123 Shares issued to shareholders in reinvestment of dividends 806,389 7,003,135 --------------- --------------- Total issued 3,795,813 32,893,258 Shares tendered (10,549,037) (90,555,587) --------------- --------------- Net decrease (6,753,224) $ (57,662,329) =============== =============== For the Year Ended Dollar August 31, 2003 Shares Amount Shares sold 1,561,464 $ 12,799,507 Shares issued to shareholders in reinvestment of dividends 2,395,510 19,319,880 --------------- --------------- Total issued 3,956,974 32,119,387 Shares tendered (41,139,108) (329,880,031) --------------- --------------- Net decrease (37,182,134) $ (297,760,644) =============== =============== 4. Capital Loss Carryforward: On August 31, 2003, the Fund had a net capital loss carryforward of $246,934,067, of which $1,471,065 expires in 2004, $3,278,446 expires in 2005, $4,468,275 expires in 2006, $3,365,959 expires in 2007, $28,290,011 expires in 2008, $64,746,799 expires in 2009, $87,904,309 expires in 2010 and $53,409,203 expires in 2011. This amount will be available to offset like amounts of any future taxable gains. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Schedule of Investments Master Senior Floating Rate Trust S&P Moody's Face Industry++ Rating Rating Amount Senior Secured Floating Rate Loan Interests** Value Automotive BB Ba2 $ 1,756,522 TRW Automotive Inc., Term B, due 2/28/2011 $ 1,789,300 Equipment--0.6% Tenneco Automotive Inc.: B B1 2,482,759 Term B, due 12/12/2010 2,528,275 B B1 1,117,241 Term B-1, due 12/12/2010 1,137,724 -------------- 5,455,299 Broadcasting--0.6% B+ Ba3 3,970,000 Cumulus Media Inc., Term D, due 3/28/2010 4,029,550 BB Ba2 1,843,600 Sinclair Broadcasting Group Inc., Term B, due 12/31/2009 1,865,329 -------------- 5,894,879 Cable--U.S.--22.7% BB Ba3 4,645,865 CC VI Operating Company LLC, Term B, due 11/12/2008 4,512,877 B B2 14,602,000 CC VIII Operating Company LLC, Term B, due 2/02/2008 14,401,223 NR* NR* 50,000,000 Century Cable Holdings LLC, Term, due 6/30/2009 47,947,900 Charter Communications Holdings: NR* NR* 57,723,030 Term B, due 3/18/2008 56,287,977 NR* NR* 5,000,000 Term B, due 9/18/2008 4,875,695 B- B2 7,371,212 Charter Communications Operating LLC, Incremental Term, due 9/18/2008 7,179,767 B Ba3 9,500,000 Falcon Holdings Group, Term C, due 12/31/2007 9,254,587 Frontiervision Operating Partners LP: D B2 3,582,057 Term A, due 9/30/2005 3,562,653 D B2 15,668,000 Term B, due 3/31/2006 15,583,126 NR* Caa1 9,975,000 Hilton Head/UCA Inc., Term B, due 3/31/2008 9,625,875 Inmarsat Investments Limited: BB- Ba3 4,625,000 Term B, due 1/23/2017 4,646,196 BB- Ba3 4,625,000 Term C, due 1/23/2017 4,646,196 Insight Midwest Holdings, LLC: BB+ Ba3 4,000,000 Incremental Term, due 12/31/2009 4,032,500 BB+ Ba3 5,500,000 Term B, due 12/31/2009 5,537,433 D B2 23,500,000 Olympus Cable Holdings LLC, Term B, due 9/30/2010 22,391,105 BB Ba2 700,000 Panamsat Corp., Term, due 12/31/2008 711,375 B- B3 4,537,831 Pegasus Communications, Term, due 4/30/2005 4,462,199 -------------- 219,658,684 Chemicals--6.0% NR* NR* 3,654,871 CII Carbon LLC, Term, due 6/25/2008 3,508,677 NR* NR* 7,182,700 Cedar Chemical Corp., Term B, due 10/31/2003 (d) 395,049 B+ Ba3 695,652 Ethyl Corporation, Term, due 4/30/2009 701,449 Huntsman International LLC: B B1 19,634,958 Term B, due 6/30/2007 19,827,224 B B1 19,634,958 Term C, due 6/30/2008 19,843,580 BB- B1 1,000,000 KRATON Polymers LLC, Revolving Term, due 12/24/2010 1,017,917 BB- B1 6,200,000 Nalco Company, Term, due 11/04/2010 6,269,750 NR* NR* 3,000,000 Pinnacle Polymers, Term, due 12/15/2006 3,006,480 BB- B1 4,000,000 Wellman, Inc., First Lien Term, due 2/04/2009 3,928,332 -------------- 58,498,458 Consumer BB- Ba3 5,212,766 Josten's Inc., Term, due 7/29/2010 5,269,455 Non-Durables--0.5% NR* NR* 845,805 Walls Industries, Term A, due 2/28/2006 30,861 -------------- 5,300,316 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Schedule of Investments (continued) Master Senior Floating Rate Trust S&P Moody's Face Industry++ Rating Rating Amount Senior Secured Floating Rate Loan Interests** Value Diversified BB- B1 $ 3,774,074 Dex Media, Inc., Term, due 3/09/2010 $ 3,831,078 Media--2.2% B B1 4,967,751 Liberty Group Operating, Term B, due 3/31/2007 5,011,219 BB Ba3 3,000,000 MediaNews Group, Inc., Term B, due 12/30/2010 3,037,500 BB Ba3 2,475,216 RH Donnelley, Term B, due 11/15/2009 2,510,951 BB- Ba2 1,461,290 Regal Cinema, Tranche B, due 6/30/2009 1,481,535 B Ba2 3,500,000 Six Flags Entertainment Corp., Term B, due 6/30/2009 3,545,938 BB+ Ba2 2,000,000 Vivendi, Term B, due 6/30/2008 2,015,938 -------------- 21,434,159 Energy--2.7% BB+ Ba2 1,500,000 Citgo Petroleum Corp., Term B, due 2/27/2006 1,560,000 BB+ Ba2 5,000,000 Cogentrix Delaware Holdings, Inc., Term B, due 2/27/2009 5,031,250 BB- Ba3 1,006,451 Dresser, Inc., Term B, due 4/10/2009 1,017,983 NR* NR* 3,500,000 GulfTerra Energy Partners, L.P., Term, due 12/10/2008 3,530,625 B+ B2 2,500,000 Parker Drilling Company, Term, due 10/01/2007 2,605,450 NR* NR* 5,000,000 Pride International, Inc., Term B, due 1/15/2009 5,062,500 BB Ba3 4,962,500 Tesoro Petroleum Corp., Term, due 4/15/2008 5,119,647 NR* NR* 2,674,424 WH Energy Services, Term B, due 4/16/2007 2,701,168 -------------- 26,628,623 Food & Drug--0.5% B+ B1 4,638,419 The Pantry Inc., Term, due 7/31/2006 4,696,400 Food & BB Ba3 885,630 American Seafood, Term B, due 3/31/2009 889,965 Tobacco--2.0% BB+ Ba1 4,656,579 Dean Foods Company, Term B, due 7/30/2008 4,732,248 BB- Ba3 3,478,244 DelMonte, Term B, due 12/20/2010 3,535,854 Doane Pet Care Company: B- B1 1,142,857 Revolving Credit, due 3/31/2005 1,123,798 B- B1 967,060 Term A, due 3/31/2005 969,477 B- B1 698,187 Term B, due 12/31/2005 700,950 B+ B1 3,486,404 Domino's Pizza, Term, due 6/25/2010 3,542,186 NR* NR* 4,339,726 Dr. Pepper Bottling, Term B, due 12/19/2010 4,407,534 -------------- 19,902,012 Gaming--2.0% B+ Ba3 6,378,403 Ameristar Casinos Inc., Term B, due 12/31/2006 6,417,273 B+ B2 5,386,500 Marina District Finance Co., Term B, due 12/13/2007 5,466,624 B B2 3,920,000 Pinnacle Entertainment, Inc., Term, due 12/15/2009 3,952,928 B+ B1 2,955,000 Venetian Casino Resort, LLC/Las Vegas Sands, Inc., Term B, due 5/01/2008 3,001,787 -------------- 18,838,612 Health Care--3.3% BB B1 1,418,572 Alaris Medical Systems, Inc., Term, due 6/30/2009 1,435,772 BB- Ba3 1,995,000 Community Health, Term, due 1/06/2011 2,030,910 BB- Ba3 6,464,983 Davita, Term B, due 3/31/2009 6,550,411 B+ B1 2,985,000 Kinetic Conc, Term B, due 8/11/2010 3,029,775 BBB Ba1 4,987,500 MedCo Health, Term B, due 6/30/2010 5,066,337 Medical Specialties (d): NR* NR* 12,845,455 Axel, due 6/30/2004 3,211,364 NR* NR* 4,418,182 Term, due 6/30/2001 1,104,545 B+ B1 4,209,005 MedPointe Inc., Term B, due 9/30/2008 4,235,311 BB- Ba3 2,500,000 Orthofix International NV, Term B, due 12/15/2008 2,520,312 BB+ Ba2 2,481,250 Oxford Health, Term, due 4/30/2009 2,495,984 -------------- 31,680,721 Housing--0.7% BB- B1 4,477,500 Amsted Industries Incorporated, Term, due 10/15/2010 4,507,584 NR* NR* 2,765,202 Trussway Industries Inc., Term B, due 12/31/2006 2,046,249 -------------- 6,553,833 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Schedule of Investments (continued) Master Senior Floating Rate Trust S&P Moody's Face Industry++ Rating Rating Amount Senior Secured Floating Rate Loan Interests** Value Information NR* Ca $ 1,507,923 Trend Technologies, Inc., Term, due 2/28/2007 (d) $ 0 Technology--0.0% Leisure--3.0% Wyndham International, Inc.: NR* NR* 12,991,174 Increasing Rate Term, due 4/01/2006 12,680,308 NR* NR* 16,497,466 Term, due 6/30/2006 16,266,204 -------------- 28,946,512 Manufacturing--1.3% ChannelMaster Holdings, Inc. (d): NR* NR* 128,199 Revolving Credit, due 11/15/2004 53,202 NR* NR* 3,287,072 Term, due 11/15/2004 1,164,037 NR* Ba2 1,700,000 Goodman Manufacturing Company, LP, Term B, due 11/21/2009 1,722,313 BB+ Ba2 4,000,000 Roper Industries, Inc., 3.11% due 12/29/2008 4,052,500 BBB- Ba2 1,856,250 SPX Corporation, Term B, due 9/30/2009 1,871,042 BB- B1 3,486,457 Trimas Corporation, Term B, due 12/31/2009 3,510,427 -------------- 12,373,521 Metals--Other--2.7% B+ B1 13,051,250 Mueller Group, Term E, due 5/31/2008 13,144,031 NR* NR* 31,000,000 Ormet Corporation, Term, due 8/15/2008 (d) 12,555,000 -------------- 25,699,031 Packaging--0.7% B B2 3,487,719 Graham Packaging Holdings Co., Term D, due 2/14/2010 3,526,084 Owens-Illinois Inc.: BB B1 1,500,000 Term A, due 4/01/2007 1,506,719 BB B1 1,500,000 Term B, due 4/01/2008 1,512,969 -------------- 6,545,772 Paper--1.5% BB+ Ba3 3,500,000 Georgia-Pacific Corporation, Term, due 11/28/2005 3,507,658 B+ B1 3,731,250 Graphic Packaging, Term B, due 8/08/2010 3,791,107 Stone Container Corporation: NR* NR* 6,003,063 Term B, due 6/30/2009 6,083,102 NR* NR* 1,017,118 Term C, due 6/30/2009 1,026,653 -------------- 14,408,520 Retail--0.9% BB Ba3 1,004,470 Advance Stores Company, Incorporated, Term E, due 11/30/2007 1,016,712 B B3 3,500,000 American Reprographics Company, LLC, Term, due 12/18/2009 3,552,500 B+ B1 3,800,000 General Nutrition Center, Inc., Term B, due 12/05/2009 3,826,125 -------------- 8,395,337 Service--4.5% B B1 3,253,886 Alliance Laundry Systems LLC, Term B, due 6/01/2007 3,268,799 Allied Waste Industries, Inc.: BB Ba3 10,495,714 Term, due 1/15/2010 10,675,013 BB Ba3 3,571,429 Tranche A--Credit Linked Deposit, due 1/1/2010 3,629,782 NR* C 8,122,491 Anthony Crane Rental Holdings LP, Term, due 7/20/2006 5,766,969 NR* NR* 6,000,000 Buhrmann US Inc., Term B-1, due 12/23/2010 6,087,186 BB- Ba3 3,939,091 Corrections Corp. of America, Term C, due 3/31/2008 3,993,253 IT Group Inc. (d): D NR* 9,991,000 Term, due 6/08/2001 799,280 D NR* 5,084,407 Term B, due 6/11/2006 406,753 NR* Caa1 8,453,718 Prime Succession Inc., Term, due 8/01/2003 (d) 338,149 BB- Ba3 5,493,931 URS Corporation, Term B, due 7/01/2008 5,512,819 United Rentals BB Ba3 2,444,444 Term, due 2/14/2011 2,475,929 BB Ba3 666,667 Term B, due 2/14/2011 675,417 -------------- 43,629,349 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Schedule of Investments (continued) Master Senior Floating Rate Trust S&P Moody's Face Industry++ Rating Rating Amount Senior Secured Floating Rate Loan Interests** Value Steel--1.2% NR* NR* $ 9,503,264 Acme Metals Incorporated, Term, due 12/01/2005 (d) $ 451,405 BB+ Ba2 2,260,313 International Steel Group, Term A, due 5/07/2007 2,270,202 Ispat International: B- Caa1 4,774,024 Term B, due 7/15/2005 4,571,128 B- Caa1 4,774,024 Term C, due 7/15/2005 4,571,128 -------------- 11,863,863 Telecommunications-- NR* NR* 6,751,147 E. Spire Communication, Term C, due 8/11/2006 (d) 1 1.6% Intera: NR* NR* 2,586,301 Term A, due 12/31/2005 773,821 NR* NR* 933,400 Term B, due 12/31/2005 279,273 NR* NR* 1,803,542 Term C, due 12/31/2005 539,620 Transaction Network Services: BB- Ba3 2,670,817 Term B, due 4/03/2007 2,693,135 BB- Ba3 3,145,309 Term B, due 3/31/2008 3,145,309 BB- Ba3 7,944,134 Valor Telecommunications, Term B, due 6/30/2008 8,003,715 -------------- 15,434,874 Transportation BB+ Ba2 4,264,762 Kansas City Southern Railway Company, Term B, due Services--1.3% 6/12/2008 4,289,130 BB+ Ba3 1,940,000 Laidlaw International, Term B, due 6/30/2009 1,975,566 B+ B1 4,150,000 North American Van Lines, Inc., Term, due 10/29/2010 4,187,611 BB- B1 1,980,000 United Components, Inc., Term C, due 6/30/2010 2,007,225 -------------- 12,459,532 Utilities--6.6% BB B2 2,000,000 The AES Corporation, Term, due 4/30/2008 2,025,750 Aquila Networks Canada Corp.: NR* NR* 6,500,000 Term, due 7/31/2004 6,508,125 BB B3 2,730,159 Term A, due 5/15/2006 2,821,163 NR* NR* 2,000,000 Term A, due 7/31/2004 2,002,500 Calpine Corporation: B B1 6,965,000 Term, due 7/15/2007 6,647,222 B B1 4,477,500 Term, due 7/16/2007 4,544,663 Mission Energy Holding Company: CCC Caa2 8,181,819 Term A, due 7/02/2006 7,936,363 CCC Caa2 21,837,662 Term B, due 7/02/2006 21,182,533 CCC Caa2 1,480,519 Term B, due 7/02/2007 1,436,104 NRG Energy, Inc.: BB B1 458,333 Credit Link Deposit, due 6/23/2010 472,155 BB B1 818,583 Term, due 6/23/2010 843,269 NR* NR* 3,214,318 Reliant Resources, Inc., Term, due 3/15/2007 3,155,390 BB+ Ba2 2,388,000 TNP Enterprises, Inc., Term, due 12/31/2006 2,410,388 BB B1 1,990,000 Williams Production RMT Company, Term, due 5/31/2007 2,007,413 -------------- 63,993,038 Wireless B B1 12,820,947 American Tower Systems Corp., Term B, due 12/31/2007 12,978,542 Communications-- B- B2 4,300,000 Centennial, Term A, due 2/09/2011 4,323,740 8.9% Crown Castle Operating Company: BB Ba3 15,668,978 Term B, due 3/31/2008 15,978,001 B- B1 3,500,000 Term B, due 9/30/2010 3,569,027 B B1 4,488,750 Dobson Cellular Systems, Inc., Term, due 3/31/2010 4,532,035 Nextel Communications, Inc.: BB Ba2 1,842,105 Term A, due 12/31/2007 1,831,552 BB- Ba2 32,000,000 Term E, due 12/15/2010 32,326,016 CCC+ B2 5,246,154 SBA Senior Finance, Inc., Term B, due 10/31/2008 5,256,114 B+ B1 5,657,288 Spectrasite Communications, Inc., Term, due 12/31/2007 5,730,527 -------------- 86,525,554 Total Investments in Senior Secured Floating Rate Loan Interests (Cost--$831,614,892)--78.0% 754,816,899 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Schedule of Investments (continued) Master Senior Floating Rate Trust S&P Moody's Face Industry++ Rating Rating Amount Corporate Debt Value Chemicals--0.2% NR* NR* $ 1,662,678 PCI Chemicals, Canada, 10% due 12/31/2008 $ 1,621,111 NR* NR* 526,515 Pioneer Companies, Inc., 4.663% due 12/31/2006 (a) 513,352 -------------- 2,134,463 Telecommunications-- CCC+ B3 9,500,000 Qwest Communications International Inc., 4.63% 1.7% due 2/15/2009 (a)(b) 8,977,500 B B1 7,000,000 Time Warner Telecom Holdings, Inc., 5.12% due 2/15/2011 (a)(b) 6,947,500 -------------- 15,925,000 Total Investments in Corporate Debt (Cost--$23,727,732)--1.9% 18,059,463 Shares Held Common Stocks Chemicals--0.1% 107,520 Pioneer Companies, Inc. 698,880 Metals & Mining--0.0% 51,714 Acme Package Corp. Senior Holdings 258,570 Telecommunications--0.0% 839 Intera (Pacific Coin) 0 Total Investments in Common Stocks (Cost--$693,424)--0.1% 957,450 Warrants (c) Service--0.0% 11,154 Anthony Crane Rental Holdings LP (Class A) 0 1,239 Anthony Crane Rental Holdings LP (Class L) 0 -------------- 0 Total Investments in Warrants (Cost--$0)--0.0% 0 Beneficial Interest Other Interests (e) $17,263,637 Medical Specialties Acquisition LLC 173 17,263,637 Medical Specialties Mezzanine LLC 173 -------------- 346 14,398 MEDIQ Incorporated (Preferred Stock Escrow due 4/01/2004) 0 14,398 MEDIQ Incorporated (Preferred Stock Escrow due 2/01/2006) 0 -------------- 0 Total Investments in Other Interests (Cost--$0)--0.0% 346 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Schedule of Investments (concluded) Master Senior Floating Rate Trust Beneficial Interest Short-Term Securities Value $189,349,206 Merrill Lynch Liquidity Series, LLC Cash Sweep Series I*** $ 189,349,206 Total Investments in Short-Term Securities (Cost--$189,349,206)--19.6% 189,349,206 Total Investments (Cost--$1,045,385,254)--99.6% 963,183,364 Other Assets Less Liabilities--0.4% 4,102,244 -------------- Net Assets--100.0% $ 967,285,608 ============== (a)Floating rate note. (b)The security may be offered and sold to "qualified institutional buyers" under Rule 144A of the Securities Act of 1933. (c)Warrants entitle the Trust to purchase a predetermined number of shares of common stock and are non-income producing. The purchase price and number of shares are subject to adjustment under certain conditions until the expiration date. (d)Non-income producing security. (e)Other interests represent beneficial interest in liquidation trusts and other reorganization entities and are non-income producing. *Not Rated. **Senior secured floating rate loan interests in which the Trust invests generally pay interest at rates that are periodically redetermined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR (London InterBank Offered Rate), (ii) the prime rate offered by one or more major United States banks or (iii) the certificate of deposit rate. ***Investments in companies considered to be an affiliate of the Trust (such companies are defined as "Affiliated Companies" in Section 2(a)(3) of the Investment Company Act of 1940) are as follows: Net Interest Affiliate Activity Income Merrill Lynch Liquidity Series, LLC Cash Sweep Series I $116,874,886 $669,008 ++For Trust compliance purposes, "Industry" means any one or more of the industry sub-classifications used by one or more widely recognized market indexes or ratings group indexes, and/or as defined by Trust management. This definition may not apply for purposes of this report, which may combine such industry sub- classifications for reporting ease. Industries are shown as a percent of net assets. See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Statement of Assets and Liabilities Master Senior Floating Rate Trust As of February 29, 2004 Assets Investments, at value (identified cost--$1,045,385,254) $ 963,183,364 Cash 333,875 Receivables: Interest (including $3,323 from affiliates) $ 4,014,552 Securities sold 2,932,078 Contributions 2,484,553 Commitment fees 18,724 9,449,907 --------------- Prepaid expenses and other assets 12,589 --------------- Total assets 972,979,735 --------------- Liabilities Payables: Securities purchased 5,025,000 Investment adviser 625,137 Other affiliates 9,990 5,660,127 --------------- Accrued expenses and other liabilities 34,000 --------------- Total liabilities 5,694,127 --------------- Net Assets Net assets $ 967,285,608 =============== Net Assets Consist of Investors' capital $ 1,049,487,498 Unrealized depreciation on investments--net (82,201,890) --------------- Net Assets $ 967,285,608 =============== See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Statement of Operations Master Senior Floating Rate Trust For the Six Months Ended February 29, 2004 Investment Income Interest (including $669,008 from affiliates) $ 24,168,062 Facility and other fees 436,715 --------------- Total income 24,604,777 --------------- Expenses Investment advisory fees $ 4,423,680 Accounting services 149,980 Professional fees 65,804 Custodian fees 29,282 Trustees' fees and expenses 23,250 Pricing fees 6,156 Printing and shareholder reports 2,451 Other 10,406 --------------- Total expenses 4,711,009 --------------- Investment income--net 19,893,768 --------------- Realized & Unrealized Gain (Loss) on Investments--Net Realized loss on investments--net (34,074,589) Change in unrealized depreciation on investments--net 81,238,729 --------------- Total realized and unrealized gain on investments--net 47,164,140 --------------- Net Increase in Net Assets Resulting from Operations $ 67,057,908 =============== See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Statements of Changes in Net Assets Master Senior Floating Rate Trust For the Six For the Months Ended Year Ended February 29, August 31, Increase (Decrease) in Net Assets: 2004 2003 Operations Investment income--net $ 19,893,768 $ 29,350,086 Realized loss on investments--net (34,074,589) (14,781,467) Change in unrealized depreciation on investments--net 81,238,729 67,910,155 --------------- --------------- Net increase in net assets resulting from operations 67,057,908 82,478,774 --------------- --------------- Capital Transactions Proceeds from contributions 75,077,463 19,158,032 Fair value of net assets contributions -- 841,562,097 Fair value of withdrawals (117,727,593) (182,526,372) --------------- --------------- Net increase (decrease) in net assets derived from capital transactions (42,650,130) 678,193,757 --------------- --------------- Net Assets Total increase in net assets 24,407,778 760,672,531 Beginning of period 942,877,830 182,205,299 --------------- --------------- End of period $ 967,285,608 $ 942,877,830 =============== =============== See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Financial Highlights Master Senior Floating Rate Trust For the Period For the Six October 6, Months Ended For the Year Ended 2000++ to The following ratios have been derived from February 29, August 31, August 31, information provided in the financial statements. 2004 2003 2002 2001 Total Investment Return** Total investment return 7.58%+++ 11.07% (4.66%) -- ========== ========== ========== ========== Ratios to Average Net Assets Expenses, excluding interest expense 1.01%* 1.04% 1.09% 1.06%* ========== ========== ========== ========== Expenses 1.01%* 1.05% 1.12% 1.06%* ========== ========== ========== ========== Investment income--net 4.26%* 4.80% 5.31% 7.92%* ========== ========== ========== ========== Leverage Amount of borrowings outstanding, end of period (in thousands) -- -- $ 13,000 -- ========== ========== ========== ========== Average amount of borrowings outstanding during the period (in thousands) -- $ 3,187 $ 3,959 -- ========== ========== ========== ========== Supplemental Data Net assets, end of period (in thousands) $ 967,286 $ 942,878 $ 182,205 $ 376,931 ========== ========== ========== ========== Portfolio turnover 31.37% 56.56% 36.77% 19.53% ========== ========== ========== ========== *Annualized. **Total investment return is required to be disclosed for fiscal years beginning after December 15, 2000. ++Commencement of operations. +++Aggregate total investment return. See Notes to Financial Statements. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Notes to Financial Statements Master Senior Floating Rate Trust 1. Significant Accounting Policies: Master Senior Floating Rate Trust (the "Trust") is registered under the Investment Company Act of 1940, as amended, and is organized as a Delaware statutory trust. The Declaration of Trust permits the Trustees to issue nontransferable interests in the Trust, subject to certain limitations. The Trust'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 Trust. (a) Loan participation interests--The Trust primarily invests in senior secured floating rate loan interests ("Loan Interests") with collateral having a market value, at the time of acquisition by the Trust, which Trust management believes equals or exceeds the principal amount of the Corporate Loan. The Trust may invest up to 20% of its total assets in loans made on an unsecured basis. Because agents, banks and intermediate participants from whom the Trust purchases the loan interest are primarily financial institutions, the Trust's investment in Corporate Loans at February 29, 2004 could be considered to be concentrated in the industry group consisting of financial institutions. (b) Valuation of investments--Loan Interests are valued in accordance with guidelines established by the Board of Trustees. Loan Interests are valued at the mean between the last available bid and asked prices from one or more brokers or dealers as obtained from Loan Pricing Corporation. For the limited number of Loan Interests for which no reliable price quotes are available, such Loan Interests will be valued by Loan Pricing Corporation through the use of pricing matrices to determine valuations. If the pricing service does not provide a value for the loan interests, the Investment Adviser will value the Loan Interests at fair value, which is intended to approximate market value. Securities that are held by the Trust that are traded on stock exchanges or the Nasdaq National Market are valued at the last sale price or official close price on the exchange on which such securities are traded, as of the close of business on the day the securities are being valued or, lacking any sales, at the last available bid price for long positions, and at the last available ask price for short positions. In cases where securities are traded on more than one exchange, the securities are valued on the exchange designated as the primary market by or under the authority of the Board of Trustees of the Trust. Long positions in securities traded in the over-the-counter ("OTC") market, Nasdaq Small Cap or Bulletin Board are valued at the last available bid price or yield equivalent obtained from one or more dealers or pricing services approved by the Board of Trustees of the Trust. Short positions in securities traded in the OTC market are valued at the last available ask price. Portfolio securities that are traded both in the OTC market and on a stock exchange are valued according to the broadest and most representative market. When the Trust writes an option, the amount of the premium received is recorded on the books of the Trust as an asset and an equivalent liability. The amount of the liability is subsequently valued to reflect the current market value of the option written, based on the last sale price in the case of exchange- traded options or, in the case of options traded in the OTC market, the last ask price. Options purchased by the Trust are valued at their last sale price in the case of exchange-traded options or, in the case of options traded in the OTC market, the last bid price. The value of swaps, including interest rate swaps, caps and floors, will be determined by obtaining dealer quotations. Other investments, including futures contracts and related options, are stated at market value. Obligations with remaining maturities of 60 days or less are valued at amortized cost unless the Investment Adviser believes that this method no longer produces fair valuations. Repurchase agreements will be valued at cost plus accrued interest. The Trust employs certain pricing services to provide securities prices for the Trust. 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 the pricing services retained by the Trust, which may use a matrix system for valuations. The procedures of a pricing service and its valuations are reviewed by the officers of the Trust under the general supervision of the Board of Trustees. Such valuations and procedures will be reviewed periodically by the Trustees. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Notes to Financial Statements (continued) Master Senior Floating Rate Trust Generally, trading in foreign securities, as well as U.S. government securities and money market instruments, is substantially completed each day at various times prior to the close of business on the New York Stock Exchange ("NYSE"). The values of such securities used in computing the net assets of the Trust are determined as of such times. Foreign currency exchange rates also are generally determined prior to the close of business on the NYSE. Occasionally, events affecting the values of such securities and such exchange rates may occur between the times at which they are determined and the close of business on the NYSE that may not be reflected in the computation of the Trust's net assets. If events (for example, a company announcement, market volatility or a natural disaster) occur during such periods that are expected to materially affect the value of such securities, those securities may be valued at their fair value as determined in good faith by the Board of Trustees or by the Investment Adviser using a pricing service and/or procedures approved by the Board of Trustees. (c) Derivative financial instruments--The Trust may engage in various portfolio investment strategies both to increase the return of the Trust 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. * Swaps--The Trust may enter into swap agreements, which are over- the-counter contracts in which the Trust and counterparty agree to make periodic net payments on a specified notional amount. The net payments can be made for a set period of time or may be triggered by a pre-determined credit event. The net periodic payments may be based on a fixed or variable interest rate; the change in market value of a specified security, basket of securities, or index; or the return generated by a security. (d) Income taxes--The Trust is classified as a partnership for Federal income tax purposes. As such, each investor in the Trust is treated as owner of its proportionate share of the net assets, income, expenses and realized and unrealized gains and losses of the Trust. Therefore, no Federal income tax provision is required. It is intended that the Trust's assets will be managed so an investor in the Trust can satisfy the requirements of subchapter M of the Internal Revenue Code. (e) 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 Trust amortizes all premiums and discounts on debt securities. 2. Investment Advisory Agreement and Transactions with Affiliates: The Trust 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 Trust's portfolio and provides the necessary personnel, facilities, equipment and certain other services necessary to the operations of the Trust. For such services, the Trust pays a monthly fee at an annual rate of .95% of the average daily value of the Trust's net assets. For the six months ended February 29, 2004, the Trust reimbursed FAM $10,360 for certain accounting services. Certain officers and/or trustees of the Trust are officers and/or directors of FAM, PSI, FDS, and/or ML & Co. 3. Investments: Purchases and sales of investments, excluding short-term securities, for the six months ended February 29, 2004 were $253,221,131 and $386,247,234, respectively. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Notes to Financial Statements (concluded) Master Senior Floating Rate Trust Net realized losses for the six months ended February 29, 2004 and net unrealized losses as of February 29, 2004 were as follows: Realized Unrealized Losses Losses Loan interests $ (34,074,589) $ (81,560,572) Unfunded loan interests -- (641,318) --------------- --------------- Total $ (34,074,589) $ (82,201,890) =============== =============== As of February 29, 2004, net unrealized depreciation for Federal income tax purposes aggregated $82,298,953, of which $10,741,698 related to appreciated securities and $93,040,651 related to depreciated securities. At February 29, 2004, the aggregate cost of investments for Federal income tax purposes was $1,045,482,317. 4. Unfunded Corporate Loans: As of February 29, 2004, the Fund had unfunded loan commitments of approximately $10,124,000, which would be extended at the option of the borrower, pursuant to the following loan agreement: Unfunded Commitment Borrower (in thousands) ChannelMaster Holdings, Inc. $ 483,000 Doane Pet Care Company $3,143,000 Parker Drilling Company $2,500,000 Pinnacle Entertainment, Inc. $1,040,000 SBA Senior Finance, Inc. $ 954,000 United Rentals, Inc. $ 889,000 Walls Industries $1,115,000 5. Short-Term Borrowings: The Trust, 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 Trust may borrow under the credit agreement to fund investors, withdrawals and for other lawful purposes other than for leverage. The Trust may borrow up to the maximum amount allowable under the Trust's current prospectus and statement of additional information, subject to various other legal, regulatory or contractual limits. The Trust pays a commitment fee of ..09% per annum based on the Trust'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 February 29, 2004. MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 Portfolio Information Master Senior Floating Rate Trust As of February 29, 2004 Percent of Ten Largest Holdings Total Assets Charter Communications Holdings* 6.3% Century Cable Holdings LLC 4.9 Huntsman International LLC* 4.1 Nextel Communications, Inc.* 3.5 Mission Energy Holding Company* 3.1 Wyndham International, Inc.* 3.0 Olympus Cable Holdings LLC 2.3 Crown Castle Operating Company* 2.0 Frontiervision Operating Partners LP* 2.0 CC VIII Operating Company LLC* 1.5 *Includes combined holdings and/or affiliates, where applicable. Percent of Five Largest Industries++ Total Assets Cable--U.S. 22.6% Wireless Communications 8.9 Utilities 6.6 Chemicals 6.3 Service 4.5 ++For Trust compliance purposes, "Industries" means any one or more of the industry sub-classifications used by one or more widely recognized market indexes or ratings group indexes, and/or as defined by Trust management. This definition may not apply for purposes of this report, which may combine such industry sub- classifications for reporting ease. Percent of Quality Ratings by Long-Term S&P/Moody's Investments BBB/Baa 2.6% BB/Ba 37.5 B/B 38.5 CCC/Caa 7.5 CC/Ca and Lower 0.9 NR (Not Rated) 13.0 MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 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 SENIOR FLOATING RATE FUND, INC., FEBRUARY 29, 2004 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 to this semi-annual report Item 6 - Schedule of Investments - Not Applicable Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable to this semi-annual report Item 8 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers - Not Applicable 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 changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d)) that occurred during the last fiscal half-year of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 11 - Exhibits attached hereto 11(a)(1) - Code of Ethics - Not Applicable to this semi-annual report 11(a)(2) - Certifications - Attached hereto 11(a)(3) - Not Applicable 11(b) - Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Merrill Lynch Senior Floating Rate Fund, Inc. By: _/s/ Terry K. Glenn_______ Terry K. Glenn, President of Merrill Lynch Senior Floating Rate Fund, Inc. Date: April 16, 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 Senior Floating Rate Fund, Inc. Date: April 16, 2004 By: _/s/ Donald C. Burke________ Donald C. Burke, Chief Financial Officer of Merrill Lynch Senior Floating Rate Fund, Inc. Date: April 16, 2004