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, 2006 Date of reporting period: January 31, 2006 ITEM 1. SCHEDULE OF INVESTMENTS. ACM MUNICIPAL SECURITIES INCOME FUND PORTFOLIO OF INVESTMENTS January 31, 2006 (Unaudited) Principal Amount (000) Value --------- ----------- Long-Term Municipal Bonds - 163.3% Alabama - 5.8% Jefferson Cnty Wtr and Swr Rev FGIC Ser 02B Prerefunded 8/01/12 @ 100 5.00%, 2/01/41..................................... $1,535 $ 1,644,691 Jefferson Cnty Wtr and Swr Rev FGIC Ser 02B 5.00%, 2/01/41..................................... 2,465 2,655,865 Jefferson Cnty Ltd Obligation Sch Warrants Ser 04A 5.25%, 1/01/18..................................... 1,300 1,382,030 5.25%, 1/01/23..................................... 525 553,445 Montgomery Spl Care Fac Fin Auth (Baptist Med Ctr) Ser 04C 5.25%, 11/15/29.................................... 1,000 1,105,010 ----------- 7,341,041 ----------- Alaska - 8.4% Alaska International Airport MBIA Ser 03B 5.00%, 10/01/26.................................... 1,000 1,035,320 Alaska Muni Bond Bank Auth MBIA Ser 03E 5.25%, 12/01/26.................................... 3,000 3,208,110 Alaska Muni Bond Bank Auth MBIA Ser 04G 5.00%, 2/15/22..................................... 1,585 1,664,060 Anchorage Alaska Wastewater Rev MBIA 5.125%, 5/01/29.................................... 2,300 2,412,470 Four Dam Pool Alaska Ser 04 5.25%, 7/01/25 .................................... 2,195 2,277,993 ----------- 10,597,953 ----------- Arizona - 2.3% Arizona Cap Facs Fin Corp (Arizona St Univ Proj) 6.25%, 9/01/32 .................................... 1,550 1,604,235 Phoenix Civic Impt Corp Wastewater Sys Rev (JR Lien) MBIA Ser 04 5.00%, 7/01/23..................................... 1,250 1,316,575 ----------- 2,920,810 ----------- California - 15.6% Burbank Redev Agy FGIC Ser 03 5.625%, 12/01/28................................... 2,700 2,990,304 California Dept of Wtr Ser 02A 5.375%, 5/01/22 ................................... 2,000 2,217,580 Principal Amount (000) Value --------- ----------- California St GO Ser 03 5.00%, 2/01/32..................................... $ 2,450 $ 2,516,224 5.00%, 2/01/33..................................... 1,100 1,129,029 Golden St Tobacco Settlement XLCA Ser 03B 5.50%, 6/01/33 .................................... 3,000 3,335,520 Golden St Tobacco Settlement RADIAN Ser 03B 5.50%, 6/01/43 .................................... 2,250 2,501,640 Pomona Lease Rev AMBAC Ser 03 5.50%, 6/01/24 .................................... 1,465 1,619,396 5.50%, 6/01/34 .................................... 3,000 3,273,990 ----------- 19,583,683 ----------- Colorado - 3.3% Colorado Toll Rev (Hwy E-470) Ser 00 Zero coupon, 9/01/35............................... 10,000 1,276,600 Colorado Hlth Facs Auth Rev (Parkview Med Ctr) Ser 04 5.00%, 9/01/25..................................... 760 770,017 Northwest Colorado Metro Dist No 3 GO Ltd Tax 6.125%, 12/01/25................................... 500 504,030 Park Creek Metro Dist Rev Ltd Senior Lien Property Tax 5.25%, 12/01/25.................................... 1,160 1,193,141 Todd Creek Farms Metro Dist No 1 Wtr and Wastewater Rev Ser 04 6.125%, 12/01/19................................... 400 398,404 ----------- 4,142,192 ----------- Florida - 19.9% Florida Hsg Fin Corp Rev MFHR (Westlake Apts) FSA Ser 02-D1 AMT 5.40%, 3/01/42..................................... 8,780 8,952,527 Lee Cnty Hlth Care Fac Rev (Shell Point Village Proj) Ser 99A 5.50%, 11/15/29.................................... 3,670 3,707,581 Miami Beach Hlth Fac Rev (Mount Sinai Med Ctr) 6.75%, 11/15/24(a)................................. 2,000 2,236,620 Miami-Dade Cnty Spl Oblig MBIA Ser 04B 5.00%, 4/01/24..................................... 4,000 4,202,040 Orange Cnty Hlth Fac Auth Rev (Orlando Regl Healthcare) Ser 02 5.75%, 12/01/32.................................... 1,400 1,571,682 Principal Amount (000) Value --------- ----------- Osceola Cnty Sch Brd Ctfs FGIC Ser 04A 5.00%, 6/01/22..................................... $2,815 $ 2,981,648 UCF Assn Ctfs FGIC Ser 04A 5.125%, 10/01/24................................... 1,325 1,409,191 ----------- 25,061,289 ----------- Hawaii - 2.0% Hawaii Elec Rev XLCA Ser 03B AMT 5.00%, 12/01/22.................................... 2,500 2,580,275 ----------- Illinois - 10.5% Chicago GO FSA Ser 04A 5.00%, 1/01/25..................................... 2,165 2,258,268 Chicago Arpt Rev (O'Hare Intl Arpt) XLCA Ser B-1 5.25%, 1/01/34............,,,...................... 3,100 3,246,878 Chicago Hsg Agy SFMR (Mortgage Rev) GNMA/FNMA Ser 02B AMT 6.00%, 10/01/33.................................... 700 721,896 Chicago Park Dist GO (Ltd Tax) AMBAC Ser 04A 5.00%, 1/01/25..................................... 2,585 2,702,204 Cook Cnty Sch Dist FSA Ser 04 4.60%, 12/01/20(b)................................. 1,000 952,250 Illinois Fin Auth (Loyola Univ Chicago) XLCA Ser 04A 5.00%, 7/01/24....,,,.............................. 1,495 1,560,645 Metropolitan Pier & Exposition Rev (McCormick Pl) MBIA Ser 02A 5.25%, 6/15/42..................................... 1,750 1,838,148 ----------- 13,280,289 ----------- Indiana - 2.5% Hendricks Cnty Bldg Facs GO Ser 04 5.50%, 7/15/21..................................... 1,045 1,147,661 Indiana Bd Bk Rev FSA Ser 04B 5.00%, 2/01/21..................................... 1,100 1,158,465 Indiana St Dev Fin Auth Rev (Inland Steel Co) Exempt Facs 5.75%, 10/01/11.................................... 865 888,831 ----------- 3,194,957 ----------- Principal Amount (000) Value --------- ----------- Louisiana - 0.9% New Orleans GO MBIA 5.25%, 12/01/20.................................... $ 1,000 $ 1,078,760 ----------- Massachusetts - 10.3% Mass GO Ser 02 Prerefunded 11/01/12 @ 100 5.25%, 11/01/30.................................... 3,310 3,603,266 Mass GO Ser 02 5.25%, 11/01/30.................................... 1,690 1,839,734 Mass Hlth & Ed Fac Hosp Rev (New England Med Ctr) MBIA Ser 94 7.09%, 7/01/18(c).................................. 5,000 5,074,700 Mass Hsg Fin Agy MFHR (Rental Rev) AMBAC Ser 00A AMT 6.00%, 7/01/41..................................... 1,740 1,850,786 Mass Hsg Fin Agy MFHR (Rental Rev) MBIA Ser 00H AMT 6.65%, 7/01/41..................................... 545 587,112 ----------- 12,955,598 ----------- Michigan - 5.3% Kent Hosp Fin Auth 5.75%, 7/01/25..................................... 310 328,702 Michigan St Hosp Rev (Trinity Hlth) Ser 00A 6.00%, 12/01/27 ................................... 3,000 3,280,110 Saginaw Hosp Fac Rev (Covenant Med Ctr) Ser 00F 6.50%, 7/01/30..................................... 2,775 3,032,603 ----------- 6,641,415 ----------- Minnesota - 1.4% Shakopee Health Care Facs Rev (St Francis Regl Med Ctr) Ser 04 5.10%, 9/01/25..................................... 1,200 1,231,812 St. Paul Hsg & Redev Auth Hosp Rev Hlth Hosp Nursinghome Impr 6.00%, 11/15/25.................................... 500 536,620 ----------- 1,768,432 ----------- Mississippi - 4.1% Adams Cnty Poll Ctl Rev (International Paper Co) Ser 99 AMT 6.25%, 9/01/23..................................... 1,000 1,067,730 Gulfport Hosp Fac Rev (Mem Hosp at Gulfport Proj) Ser 01A 5.75%, 7/01/31..................................... 4,000 4,106,200 ----------- 5,173,930 ----------- Principal Amount (000) Value --------- ----------- Nevada - 1.7% Carson City Hosp Rev (Carson-Tahoe Hosp Proj) RADIAN Ser 03A 5.00%, 9/01/23..................................... $ 2,100 $ 2,151,807 ----------- New Jersey - 6.2% Morris-Union Jointure Commission Ctfs of Participation Ser 04 RADIAN 5.00%, 5/01/24..................................... 2,000 2,076,340 New Jersey Eco Dev Auth (Cigarette Tax) Ser 04 FGIC 5.00%, 6/15/12..................................... 1,745 1,855,249 New Jersey St Edl Fac Auth Rev AMBAC Ser 02A-213 5.84%, 9/01/21(a)(c)(d)............................ 3,400 3,915,644 ----------- 7,847,233 ----------- New Mexico - 4.9% Dona Ana Cnty Tax Rev AMBAC Ser 03 5.25%, 5/01/25..................................... 500 531,185 University of New Mexico FSA FHA Ser 04 5.00%, 1/01/24..................................... 2,235 2,328,334 5.00%, 7/01/24..................................... 3,195 3,328,423 ----------- 6,187,942 ----------- New York - 4.7% Erie Cnty Indl Dev Agy Sch Fac Rev (Buffalo Sch Dist Proj) Ser 04 FSA 5.75%, 5/01/23..................................... 950 1,072,835 5.75%, 5/01/24..................................... 810 914,117 New York City GO Ser 04I 5.00%, 8/01/21..................................... 3,300 3,450,975 New York City Indl Dev Agy Rev (British Airways) Ser 98 AMT 5.25%, 12/01/32.................................... 500 437,570 ----------- 5,875,497 ----------- North Carolina - 3.9% Charlotte NC Arpt Rev MBIA Ser 04 5.25%, 7/01/24..................................... 1,000 1,072,250 North Carolina Eastern Muni Power Agy (Power Sys Rev) AMBAC Ser 05A 5.25%, 1/01/20..................................... 3,500 3,801,210 ----------- 4,873,460 ----------- North Dakota - 1.7% North Dakota Hsg Fin Agy SFMR (Mortgage Rev) Ser 98E AMT 5.25%, 1/01/30..................................... 2,085 2,120,257 ----------- Principal Amount (000) Value --------- ----------- Ohio - 6.2% Cuyahoga Cnty Hosp Fac Rev (University Hosp Hlth) Ser 00 7.50%, 1/01/30..................................... $ 2,400 $ 2,665,104 Fairfield Cnty Hosp Fac Rev (Fairfield Med Ctr Proj) RADIAN Ser 03 5.00%, 6/15/23..................................... 1,255 1,289,337 Ohio Hsg Fin Agy MFHR (Mortgage Rev) GNMA Ser 97 AMT 6.15%, 3/01/29..................................... 3,225 3,299,304 Port Auth Columbiana Cnty Solid Waste Fac Rev (Apex Environmental LLC) Ser 04A AMT 7.125%, 8/01/25.................................... 500 502,415 ----------- 7,756,160 ----------- Oregon - 1.2% Forest Grove Campus Impr (Pacific Proj) RADIAN Ser A 5.00%, 5/01/28..................................... 1,420 1,457,971 ----------- Pennsylvania - 4.3% Pennsylvania Parking Facs Rev (30th St Station) ACA Ser 02 AMT 5.875%, 6/01/33.................................... 2,050 2,156,539 Philadelphia Gas Wks Rev AGC Ser 04 5.25%, 9/01/19..................................... 2,045 2,204,367 5.25%, 8/01/21..................................... 1,000 1,075,850 ----------- 5,436,756 ----------- 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 1,773,634 Rhode Island Hlth & Edl Bldg Corp Rev (Univ of Rhode Island) AMBAC Ser 04A 5.50%, 9/15/24..................................... 1,000 1,096,910 ----------- 2,870,544 ----------- South Carolina - 1.4% Newberry Cnty Sch Dist Proj 5.00%, 12/01/27.................................... 1,560 1,607,549 5.00%, 12/01/30.................................... 165 166,520 ----------- 1,774,069 ----------- Tennessee - 8.3% Johnson City Tenn Hlth & Edl Facs Brd Hosp Rev (Mountain States Health Alliance) Ser 06A 5.50%, 7/01/31..................................... 640 664,640 Principal Amount (000) Value --------- ----------- Tenn Ed Loan Rev (Educational Funding of South) Ser 97B AMT 6.20%, 12/01/21 ................................... $9,600 $ 9,790,272 ----------- 10,454,912 ----------- Texas - 16.8% Dallas TX Arpt Rev (Fort Worth Intl Arpt) MBIA Ser 03A AMT 5.25%, 11/01/25 ................................... 2,000 2,086,400 Garza Cnty Pub Fac Corp Proj Rev 5.50%, 10/01/19 ................................... 255 265,024 Harris Cnty Ser 03 5.00%, 10/01/23 ................................... 1,400 1,460,522 Harris Cnty Toll Rev FSA Ser 02 5.125%, 8/15/32 ................................... 5,000 5,195,200 Hidalgo Cnty Hlth Svcs (Mission Hosp Inc Proj) Ser 05 5.00%, 8/15/14 .................................... 80 81,750 5.00%, 8/15/15 .................................... 185 188,426 5.00%, 8/15/19 .................................... 60 60,671 Lewisville TX Combination Contract Rev Spl Assessment (Castle Hills Pub Impr Proj) ACA 6.00%, 10/01/25 ................................... 550 600,061 Lower Colorado Riv Auth AMBAC Ser 03 5.25%, 5/15/25 .................................... 1,800 1,902,384 Lower Colorado Riv Auth MBIA Ser 02 5.00%, 5/15/31 .................................... 1,500 1,546,980 Matagorda Cnty Rev (Centerpoint Energy Houston Electric LLC) Ser 04 5.60%, 3/01/27 .................................... 1,000 1,037,850 MC Allen Wtr & Swr Rev 5.25%, 02/01/21 ................................... 1,605 1,735,150 5.25%, 02/01/22 ................................... 1,610 1,734,292 Richardson Hosp Auth Rev (Richardson Med Ctr) Ser 04 6.00%, 12/01/19 ................................... 915 996,462 5.875%, 12/01/24 .................................. 1,155 1,221,239 Seguin Ed Fac Rev (Texas Lutheran Univ) Ser 04 5.25%, 9/01/28 .................................... 1,000 1,013,740 ----------- 21,126,151 ----------- Principal Amount (000) Value --------- ------------ Utah - 2.1% Davis Cnty Sales Tax Rev AMBAC Ser 03B 5.25%, 10/01/23 .................................. $1,005 $ 1,073,642 Salt Lake City Wtr Rev AMBAC Ser 04 5.00%, 7/01/23 ................................... 1,500 1,578,810 ------------ 2,652,452 ------------ Washington - 1.2% Seattle Hsg Auth Rev MFHR (Wisteria Ct Proj) GNMA Ser 03 5.20%, 10/20/28 .................................. 1,475 1,524,899 ------------ Wisconsin - 4.1% Wisconsin GO Ser 03 5.00%, 11/01/26 .................................. 3,700 3,801,565 Wisconsin Hlth & Edl Fac Auth Rev (Bell Tower Residence Proj) Ser 05 LOC-Allied Irish Bank PLC 5.00%, 7/01/20 ................................... 1,300 1,343,316 ------------ 5,144,881 ------------ Total Long-Term Municipal Bonds (cost $198,293,035) .............................. 205,575,615 ------------ Short-Term Municipal Bonds(e) - 6.6% Alaska - 0.8% Valdez Alaska Marine Term Rev (BP Pipelines Proj) Ser 03B 3.08%, 7/01/37 ................................... 1,000 1,000,000 ------------ Massachusetts - 1.4% Massachusetts State GO (Central Artery) Ser 00B 3.08%, 12/01/30 .................................. 1,800 1,800,000 ------------ Mississippi - 4.4% Jackson Cnty Port Facs Rev (Chevron USA Inc Proj) 3.08%, 6/01/23 ................................... 5,500 5,500,000 ------------ Total Short-Term Municipal Bonds (cost $8,300,000) ................................ 8,300,000 ------------ Principal Amount (000) Value --------- ------------ Short-Term Investment(e) - 0.2% Time Deposit - 0.2% The Bank of New York 3.25% 2/01/06 (cost $203,000) ................................. $203 $ 203,000 ------------ Total Investments - 170.1% (cost $206,796,035) ............................. 214,078,615 Other assets less liabilities - 1.4% ............... 1,778,566 Preferred Stock, at redemption value - (71.5)% ..... (90,000,000) ------------ Net Assets Applicable to Common Shareholders - 100%(f).......................................... $125,857,181 ============ (a) Private placement. (b) Initial coupon is presented. Coupon after 12/01/07 will be 5.00%. (c) Inverse Floater Security - Security with variable interest rate that moves in the opposite direction of short-term interest rates. (d) Security is exempt from registration under Rule 144A of the Securities Act of 1933. This security is considered liquid and may be resold in transactions exempt from registration, normally to qualified institutional buyers. At January 31, 2006, the market value of this security amounted to $3,915,644 or 3.1% of net assets applicable to common shareholders. (e) Variable rate coupon, rate shown is the rate in effect at January 31, 2006. (f) 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 FHA - Federal Housing Administration FNMA - Federal National Mortgage Association FSA - Financial Security Assurance, Inc. GNMA - Government National Mortgage Association GO - General Obligation 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. 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 changes in the registrant's internal controls over financial reporting that occurred during the second fiscal quarter of the period that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. 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: March 23, 2006 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: March 23, 2006 By: /s/ Mark D. Gersten ---------------------- Mark D. Gersten Treasurer and Chief Financial Officer Date: March 23, 2006