UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM N-Q QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number: 811-07510 ACM MUNICIPAL SECURITIES INCOME FUND, INC. (Exact name of registrant as specified in charter) 1345 Avenue of the Americas, New York, New York 10105 (Address of principal executive offices) (Zip code) Mark R. Manley Alliance Capital Management, L.P. 1345 Avenue of the Americas New York, New York 10105 (Name and address of agent for service) Registrant's telephone number, including area code: (800) 221-5672 Date of fiscal year end: October 31, 2005 Date of reporting period: July 31, 2005 ITEM 1. SCHEDULE OF INVESTMENTS. -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value --------- ---------- Long-Term Municipal Bonds - 167.4% Alabama - 4.7% Jefferson Cnty Wtr and Swr Rev FGIC Ser 02B Prerefunded 8/01/12 @ 100 5.00%, 2/01/41...................................... $1,535 $1,663,879 Jefferson Cnty Wtr and Swr Rev FGIC Ser 02B 5.00%, 2/01/41...................................... 2,465 2,695,847 Jefferson Cnty Ltd Obligation Sch Warrants Ser 04A 5.25%, 1/01/23...................................... 525 556,826 Montgomery Spl Care Fac Fin Auth (Baptist Med Ctr) Ser 04C 5.25%, 11/15/29..................................... 1,000 1,021,290 ---------- 5,937,842 ---------- Alaska - 6.4% Alaska International Airport MBIA Ser 03B 5.00%, 10/01/26..................................... 1,000 1,043,500 Alaska Muni Bond Bank Auth MBIA Ser 03E 5.25%, 12/01/26..................................... 3,000 3,230,190 Alaska Muni Bond Bank Auth MBIA Ser 04G 5.00%, 2/15/22...................................... 1,585 1,676,296 Four Dam Pool Alaska Ser 04 5.25%, 7/01/25...................................... 2,195 2,296,607 ---------- 8,246,593 ---------- Arizona - 2.3% Arizona Cap Facs Fin Corp (Arizona St Univ Proj) 6.25%, 9/01/32...................................... 1,550 1,615,782 Phoenix Civic Impt Corp Wastewater Sys Rev (JR Lien) MBIA Ser 04 5.00%, 7/01/23...................................... 1,250 1,335,150 ---------- 2,950,932 ---------- California - 15.4% Burbank Redev Agy FGIC Ser 03 5.625%, 12/01/28.................................... 2,700 3,028,320 California Dept of Wtr Ser 02A 5.375%, 5/01/22..................................... 2,000 2,168,920 California St General Obligation Ser 03 5.00%, 2/01/32...................................... 2,450 2,546,506 5.00%, 2/01/33...................................... 1,100 1,143,329 1 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value ----------- ----------- Golden St Tobacco Settlement XLCA Ser 03B 5.50%, 6/01/33................................... $ 3,000 $ 3,310,320 Golden St Tobacco Settlement RADIAN Ser 03B 5.50%, 6/01/43................................... 2,250 2,443,275 Pomona Lease Rev AMBAC Ser 03 5.50%, 6/01/24................................... 1,465 1,636,024 5.50%, 6/01/34................................... 3,000 3,326,580 ----------- 19,603,274 ----------- Colorado - 1.9% Colorado Toll Rev (Hwy E-470) Ser 00 Zero coupon, 9/01/35............................. 10,000 1,264,000 Colorado Hlth Facs Auth Rev (Parkview Med Ctr) Ser 04 5.00%, 9/01/25................................... 760 773,612 Todd Creek Farms Metro Dist No 1 Wtr and Wastewater Rev Ser 04 6.125%, 12/01/19................................. 400 399,704 ----------- 2,437,316 ----------- Connecticut - 2.3% Connecticut St General Obligation MBIA Ser 412 7.36%, 12/01/11(a)(b)............................ 2,500 2,930,550 ----------- Florida - 19.7% Florida Hsg Fin Corp Rev MFHR (Westlake Apts) FSA Ser 02-D1 AMT 5.40%, 3/01/42................................... 8,780 8,989,227 Lee Cnty Hlth Care Fac Rev (Shell Point Village Proj) Ser 99A 5.50%, 11/15/29.................................. 3,670 3,675,945 Miami Beach Hlth Fac Rev (Mount Sinai Med Ctr) 6.75%, 11/15/24.................................. 2,000 2,244,300 Miami-Dade Cnty Spl Oblig MBIA Ser 04B 5.00%, 4/01/24................................... 4,000 4,236,080 Orange Cnty Hlth Fac Auth Rev (Orlando Regl Healthcare) Ser 02 5.75%, 12/01/32.................................. 1,400 1,514,464 Osceola Cnty Sch Brd Ctfs FGIC Ser 04A 5.00%, 6/01/22................................... 2,815 3,000,593 UCF Assn Ctfs FGIC Ser 04A 5.125%, 10/01/24................................. 1,325 1,427,780 ----------- 25,088,389 ----------- 2 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value ----------- ----------- Hawaii - 2.0% Hawaii Elec Rev XLCA Ser 03B AMT 5.00%, 12/01/22.................................. $2,500 $ 2,603,125 Illinois - 10.5% Chicago General Obligation FSA Ser 04A 5.00%, 1/01/25................................... 2,165 2,280,308 Chicago Arpt Rev (O'Hare Intl Arpt) XLCA Ser B-1 5.25%, 1/01/34................................... 3,100 3,290,154 Chicago Hsg Agy SFMR (Mortgage Rev) GNMA/FNMA Ser 02B AMT 6.00%, 10/01/33.................................. 710 741,751 Chicago Park Dist General Obligation (Ltd Tax) AMBAC Ser 04A 5.00%, 1/01/25................................... 2,585 2,729,450 Cook Cnty Sch Dist FSA Ser 04 4.60%, 12/01/20(c)............................... 1,000 932,880 Illinois Fin Auth (Loyola Univ Chicago) XLCA Ser 04A 5.00%, 7/01/24................................... 1,495 1,559,360 Metropolitan Pier & Exposition Rev (McCormick Pl) MBIA Ser 02A 5.25%, 6/15/42................................... 1,750 1,855,087 ----------- 13,388,990 ----------- Indiana - 1.8% Hendricks Cnty Bldg Facs General Obligation Ser 04 5.50%, 7/15/21................................... 1,045 1,158,612 Indiana Bd Bk Rev FSA Ser 04B 5.00%, 2/01/21................................... 1,100 1,170,411 ----------- 2,329,023 ----------- Massachusetts - 11.3% Mass General Obligation Ser 02 Prerefunded 11/01/12 @ 100 5.25%, 11/01/30.................................. 3,310 3,631,037 Mass General Obligation Ser 02 5.25%, 11/01/30.................................. 1,690 1,853,913 Mass Hlth & Ed Fac Hosp Rev (New England Med Ctr) MBIA Ser 94 7.68%, 7/01/18(b)................................ 5,000 5,189,400 3 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value --------- ----------- Mass Hsg Fin Agy MFHR (Rental Rev) AMBAC Ser 00A AMT 6.00%, 7/01/41 .................................... $2,965 $ 3,111,056 Mass Hsg Fin Agy MFHR (Rental Rev) MBIA Ser 00H AMT 6.65%, 7/01/41 .................................... 545 592,617 ----------- 14,378,023 ----------- Michigan - 5.3% Kent Hosp Fin Auth 5.75%, 7/01/25 .................................... 310 331,734 Michigan St Hosp Rev (Trinity Hlth) Ser 00A 6.00%, 12/01/27 ................................... 3,000 3,317,040 Saginaw Hosp Fac Rev (Covenant Med Ctr) Ser 00F 6.50%, 7/01/30 .................................... 2,775 3,067,679 ----------- 6,716,453 ----------- Minnesota - 1.0% Shakopee Health Care Facs Rev (St Francis Regl Med Ctr) Ser 04 5.10%, 9/01/25 .................................... 1,200 1,241,376 ----------- Mississippi - 7.4% Adams Cnty Poll Ctl Rev (International Paper Co) Ser 99 AMT 6.25%, 9/01/23 .................................... 5,000 5,288,600 Gulfport Hosp Fac Rev (Mem Hosp at Gulfport Proj) Ser 01A 5.75%, 7/01/31 .................................... 4,000 4,227,080 ----------- 9,515,680 ----------- Nevada - 1.7% Carson City Hosp Rev (Carson-Tahoe Hosp Proj) RADIAN Ser 03A 5.00%, 9/01/23 .................................... 2,100 2,173,248 ----------- New Jersey - 7.1% Morris-Union Jointure Commission Ctfs of Participation Ser 04 RADIAN 5.00%, 5/01/24 .................................... 2,000 2,090,900 New Jersey Eco Dev Auth (Cigarette Tax) Ser 04 FGIC 5.00%, 6/15/12 .................................... 1,745 1,884,670 New Jersey Eco Dev Auth (Sch Fac Construction) Ser 05K 5.25%, 12/15/15 ................................... 1,000 1,116,880 New Jersey St Edl Fac Auth Rev AMBAC Ser 02A-213 6.51%, 9/01/21(a)(b) .............................. 3,400 3,980,312 ----------- 9,072,762 ----------- 4 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value --------- ----------- New Mexico - 4.9% Dona Ana Cnty Tax Rev AMBAC Ser 03 5.25%, 5/01/25 .................................... $ 500 $ 536,420 University of New Mexico FSA FHA Ser 04 5.00%, 1/01/24 .................................... 2,235 2,353,097 5.00%, 7/01/24 .................................... 3,195 3,363,824 ----------- 6,253,341 ----------- New York - 11.1% Erie Cnty Indl Dev Agy Sch Fac Rev (Buffalo Sch Dist Proj) Ser 04 FSA 5.75%, 5/01/23 .................................... 950 1,084,397 5.75%, 5/01/24 .................................... 810 923,943 New York City General Obligation Ser 04I 5.00%, 8/01/21 .................................... 3,300 3,475,824 New York City Indl Dev Agy Rev (Terminal One Group) Ser 94 AMT 6.125%, 1/01/24 ................................... 8,100 8,206,596 New York City Indl Dev Agy Rev (British Airways) Ser 98 AMT 5.25%, 12/01/32 ................................... 500 454,865 ----------- 14,145,625 ----------- North Carolina - 0.8% Charlotte NC Arpt Rev MBIA Ser 04 5.25%, 7/01/24 .................................... 1,000 1,082,760 ----------- North Dakota - 1.9% North Dakota Hsg Fin Agy SFMR (Mortgage Rev) Ser 98E AMT 5.25%, 1/01/30 .................................... 2,365 2,386,592 ----------- Ohio - 9.7% Cuyahoga Cnty Hosp Fac Rev (University Hosp Hlth) Ser 00 7.50%, 1/01/30 .................................... 2,400 2,699,400 Fairfield Cnty Hosp Fac Rev (Fairfield Med Ctr Proj) RADIAN Ser 03 5.00%, 6/15/23 .................................... 1,255 1,300,644 Ohio Hsg Fin Agy MFHR (Mortgage Rev) GNMA Ser 97 AMT 6.15%, 3/01/29 .................................... 3,650 3,755,521 5 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value --------- ----------- Ohio State Wtr Dev Auth (North Star) Ser 95 AMT 6.45%, 9/01/20 .................................... $4,075 $ 4,167,666 Port Auth Columbiana Cnty Solid Waste Fac Rev (Apex Environmental LLC) Ser 04A AMT 7.125%, 8/01/25 ................................... 500 505,590 ----------- 12,428,821 ----------- Pennsylvania - 4.3% Pennsylvania Parking Facs Rev (30th St Station) ACA Ser 02 AMT 5.875%, 6/01/33 ................................... 2,050 2,196,247 Philadelphia Gas Wks Rev AGC Ser 04 5.25%, 9/01/19 .................................... 2,045 2,194,428 5.25%, 8/01/21 .................................... 1,000 1,064,870 ----------- 5,455,545 ----------- Rhode Island - 2.3% Rhode Island Hlth & Edl Bldg Corp Rev (Times2 Academy) LOC-Citizens Bank Ser 04 5.00%, 12/15/24 ................................... 1,745 1,786,863 Rhode Island Hlth & Edl Bldg Corp Rev (Univ of Rhode Island) AMBAC Ser 04A 5.50%, 9/15/24 .................................... 1,000 1,108,760 ----------- 2,895,623 ----------- Tennessee - 7.8% Tenn Ed Loan Rev (Educational Funding of South) Ser 97B AMT 6.20%, 12/01/21 ................................... 9,600 9,940,896 ----------- Texas - 16.5% Dallas TX Arpt Rev (Fort Worth Intl Arpt) MBIA Ser 03A AMT 5.25%, 11/01/25 ................................... 2,000 2,102,220 Harris Cnty Ser 03 5.00%, 10/01/23 ................................... 1,400 1,482,586 Harris Cnty Toll Rev FSA Ser 02 5.125%, 8/15/32 ................................... 5,000 5,235,650 Hidalgo Cnty Hlth Svcs (Mission Hosp Inc Proj) Ser 05 5.00%, 8/15/14 .................................... 80 81,952 5.00%, 8/15/15 .................................... 185 189,253 5.00%, 8/15/19 .................................... 60 60,999 6 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value --------- ------------ Lewisville TX Combination Contract Rev Spl Assessment (Castle Hills Pub Impr Proj) ACA 6.00%, 10/01/25.................................... $ 550 $ 609,543 Lower Colorado Riv Auth AMBAC Ser 03 5.25%, 5/15/25..................................... 1,800 1,919,340 Lower Colorado Riv Auth MBIA Ser 02 5.00%, 5/15/31..................................... 1,500 1,560,675 Matagorda Cnty Rev (Centerpoint Energy Houston Electric LLC) Ser 04 5.60%, 3/01/27..................................... 1,000 1,055,950 MC Allen Wtr & Swr Rev 5.25%, 02/01/21.................................... 1,605 1,752,917 5.25%, 02/01/22.................................... 1,610 1,751,760 Richardson Hosp Auth Rev (Richardson Med Ctr) Ser 04 6.00%, 12/01/19.................................... 915 1,005,384 5.875%, 12/01/24................................... 1,155 1,231,969 Seguin Ed Fac Rev (Texas Lutheran Univ) Ser 04 5.25%, 9/01/28..................................... 1,000 1,018,750 ------------ 21,058,948 ------------ Utah - 2.1% Davis Cnty Sales Tax Rev AMBAC Ser 03B 5.25%, 10/01/23.................................... 1,005 1,083,923 Salt Lake City Wtr Rev AMBAC Ser 04 5.00%, 7/01/23..................................... 1,500 1,596,420 ------------ 2,680,343 ------------ Washington - 1.2% Seattle Hsg Auth Rev MFHR (Wisteria Ct Proj) GNMA Ser 03 5.20%, 10/20/28.................................... 1,475 1,535,386 Wisconsin - 4.0% Wisconsin General Obligation Ser 03 5.00%, 11/01/26.................................... 3,700 3,796,755 Wisconsin Hlth & Edl Fac Auth Rev (Bell Tower Residence Proj) Ser 05 LOC-Allied Irish Bank PLC 5.00%, 7/01/20..................................... 1,300 1,354,626 ------------ 5,151,381 ------------ Total Long-Term Investments (cost $204,008,248)................................ 213,628,837 ------------ 7 -------------------------------------------------------------------------------- ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS July 31, 2005 (Unaudited) -------------------------------------------------------------------------------- Principal Amount (000) Value --------- ------------ Short-Term Municipal Bonds(d) - 0.8% Alaska - 0.4% Valdez Alaska Marine Term Rev (BP Pipelines Inc Proj) Ser 2003C 2.32%, 7/01/37 .................................... $ 500 $ 500,000 ------------ California - 0.4% California Economic Recovery Bonds Ser C-1 2.40%, 7/01/23 .................................... 500 500,000 ------------ Total Short-Term Investments (cost $1,000,000) ................................. 1,000,000 ------------ Total Investments - 168.2% (cost $205,008,248) ............................... 214,628,837 Other assets less liabilities - 2.3% ................. 2,948,199 Preferred Stock, at redemption value - (70.5)% ....... (90,000,000) ------------ Net Assets Applicable to Common Shareholders - 100%(e) $127,577,036 ============ (a) Security is exempt from registration under Rule 144A of the Securities Act of 1933. These securities are considered liquid and may be resold in transactions exempt from registration, normally to qualified institutional buyers. At July 31, 2005, the aggregate market value of these securities amounted to $6,910,862 or 5.4% of net assets applicable to common shareholders. (b) Inverse Floater Security - Security with variable interest rate that moves in the opposite direction of short-term interest rates. (c) Initial coupon is presented. Coupon after 12/01/07 will be 5.00%. (d) Variable rate coupon, rate shown is the rate in effect at July 31, 2005. (e) Portfolio percentages are calculated based on net assets applicable to common shareholders. Glossary of Terms: ACA - American Capital Access (Financial Guaranty Corporation) AGC - American Guaranty Corporation AMBAC - American Municipal Bond Assurance Corporation AMT - Alternative Minimum Tax FGIC - Financial Guaranty Insurance Company FNMA - Federal National Mortgage Association FHA - Federal Housing Administration FSA - Financial Security Assurance, Inc. GNMA - Government National Mortgage Association LOC - Letter of Credit MBIA - Municipal Bond Investors Assurance Corporation MFHR - Multi-Family Housing Revenue RADIAN - Radian Group, Inc. SFMR - Single Family Mortgage Revenue XLCA - XL Capital Assurance, Inc. 8 ITEM 2. CONTROLS AND PROCEDURES. (a) The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended) are effective at the reasonable assurance level based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this document. (b) There were no significant changes in the registrant's internal control over financial reporting 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 3. EXHIBITS. The following exhibits are attached to this Form N-Q: EXHIBIT NO. DESCRIPTION OF EXHIBIT ----------- ---------------------- 11 (a)(1) Certification of Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 11 (a)(2) Certification of Principal Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 SIGNATURES 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. (Registrant): ACM Municipal Securities Income Fund, Inc. By: /s/ Marc O. Mayer -------------------------- Marc O. Mayer President Date: September 23, 2005 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/ Marc O. Mayer -------------------------- Marc O. Mayer President Date: September 23, 2005 By: /s/ Mark D. Gersten -------------------------------------- Mark D. Gersten Treasurer and Chief Financial Officer Date: September 23, 2005