================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM N-Q Quarterly Schedule of Portfolio Holdings of Registered Management Investment Company Investment Company Act file number 811-02183 MassMutual Corporate Investors -------------------------------------------------------------------------------- (Exact name of registrant as specified in charter) 1500 Main Street, Suite 600, Springfield, MA 01115 -------------------------------------------------------------------------------- (Address of principal executive offices) (Zip code) Stephen L. Kuhn, Vice President and Secretary, 1295 State Street, Springfield, MA 01111 -------------------------------------------------------------------------------- (Name and address of agent for service) Registrant's telephone number, including area code: 413-226-1000 ___________________ Date of fiscal year end: 12/31 ___________________ Date of reporting period: 03/31/06 ___________________ ================================================================================ ITEM 1. SCHEDULE OF INVESTMENTS. CONSOLIDATED SCHEDULE OF INVESTMENTS MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES - 68.37%:(A) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ PRIVATE PLACEMENT INVESTMENTS - 62.28% A T I ACQUISITION COMPANY A for-profit post-secondary school serving students in Texas, Florida and Arizona. 12% Senior Subordinated Note due 2012 $ 2,125,000 04/08/04 $ 2,125,000 $ $1,894,427 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 2,323 shs. 04/08/04 -- 23 Warrant, exercisable until 2012, to purchase preferred stock at $.01 per share (B) 63,287 shs. 03/23/06 63,958 633 ------------ ------------ 2,188,958 1,895,083 ------------ ------------ ADORN, INC. A manufacturer of wall panels, cabinets, moldings and countertops for houses and recreational vehicles. 12.5% Senior Subordinated Note due 2010 $ 2,125,000 02/29/00 1,978,838 2,125,000 Warrant, exercisable until 2010, to purchase preferred stock at $.02 per share (B) 364 shs. 02/29/00 307,759 523,541 ------------ ------------ 2,286,597 2,648,541 ------------ ------------ AMERCABLE, INC. A manufacturer of electric power, instrumentation and control cables, primarily for the mining and oil and gas industries. 12% Senior Subordinated Note due 2013 $ 1,101,852 04/08/05 1,040,733 1,093,682 Limited Partnership Interest (B) 0.36% int. 04/07/05 78,704 121,048 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 125 shs. 04/08/05 122,463 192,047 ------------ ------------ 1,241,900 1,406,777 ------------ ------------ AMERICAN HOSPICE MANAGEMENT HOLDING LLC A for-profit hospice care provider in the United States. 12% Senior Subordinated Note due 2010 $ 2,125,000 01/22/04 1,923,433 2,153,854 Preferred Class A Unit (B) 2,525 uts. 01/22/04 252,500 227,250 Common Class B Unit (B) 3,042 uts. 01/22/04 1 291,840 ------------ ------------ 2,175,934 2,672,944 ------------ ------------ ARROW TRU-LINE HOLDINGS, INC. A manufacturer of hardware for residential and commercial overhead garage doors in North America. 12% Senior Subordinated Note due 2012 $ 1,627,660 05/18/05 1,524,442 1,636,698 Common Stock (B) 497 shs. 05/18/05 497,340 447,606 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 130 shs. 05/18/05 112,128 1 ------------ ------------ 2,133,910 2,084,305 ------------ ------------ AUGUSTA SPORTSWEAR HOLDING CO. A manufacturer and distributor of athletic apparel, activewear and team uniforms. 12% Senior Subordinated Note due 2012 $ 1,686,800 12/31/04 1,578,752 1,693,401 Common Stock (B) 493 shs. * 492,975 443,682 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 137 shs. 12/31/04 119,482 1 ------------ ------------ 2,191,209 2,137,084 ------------ ------------ *12/31/04 and 03/31/05. ---------------------------------------------------------------------------------------------------------------------------------- 7 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ BEACON MEDICAL PRODUCTS, INC. A designer, manufacturer and marketer of medical air and gas distribution systems. 8.54% Senior Secured Revolving Credit Facility due 2007 (C) $ 230,636 04/09/02 $ 230,636 $ 230,636 8.54% Senior Secured Tranche A Note due 2008 (C) $ 593,509 04/09/02 593,509 593,509 12% Senior Secured Note due 2010 $ 721,196 04/09/02 637,986 744,517 Limited Partnership Interest of Riverside Capital Appreciation Fund IV, L.P. (B) 8.91% int. 04/09/02 152,329 457,832 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 1,390 shs. 04/09/02 127,497 417,663 ------------ ------------ 1,741,957 2,444,157 ------------ ------------ BETA BRANDS LTD. A manufacturer of hard candy and chocolate-coated products sold primarily to the Canadian market 5% Promissory Note due 2009 (B) $ 195,498 03/31/04 195,498 -- Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 4,895 shs. 03/31/04 1 -- ------------ ------------ 195,499 -- ------------ ------------ C & J SPEC-RENT SERVICES, INC. A provider of coiled tubing and pressure pumping services to the oil and gas industry in Texas and Louisiana. 10% Senior Secured Term Note due 2012 $ 1,551,492 08/12/05 1,551,492 1,571,315 14% Senior Subordinated Note due 2013 $ 1,137,071 08/12/05 1,035,317 1,140,043 Common Stock (B) 470,150 shs. 08/12/05 470,150 423,135 Warrants, exercisable until 2013, to purchase common stock at $.01 per share (B) 86,716 shs. 08/12/05 106,592 867 ------------ ------------ 3,163,551 3,135,360 ------------ ------------ C & M CONVEYOR, INC. A manufacturer and supplier of material handling systems to the corrugated sheet and container industry. 9.5% Senior Secured Term Note due 2007 $ 759,036 09/13/02 759,036 758,541 11% Senior Subordinated Note due 2010 $ 838,102 09/13/02 808,535 837,923 Common Stock (B) 316,265 shs. 09/13/02 316,265 607,229 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 137,175 shs. 09/13/02 60,250 263,376 ------------ ------------ 1,944,086 2,467,069 ------------ ------------ CAINS FOODS, L.P. A producer of mayonnaise and sauce products for both the retail and food service markets. Limited Partnership Interest (B) 3.69% int. 09/29/95 45,046 356,927 ------------ ------------ ---------------------------------------------------------------------------------------------------------------------------------- 8 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ CAPESUCCESS LLC A provider of diversified staffing services. Preferred Membership Interests (B) 1,882 uts. 04/29/00 $ 8,396 $ 420 Common Membership Interests (B) 24,318 uts. 04/29/00 108,983 5,442 ------------ ------------ 117,379 5,862 ------------ ------------ CAPITAL SPECIALTY PLASTICS, INC. A producer of desiccant strips used for packaging pharmaceuticals products. Common Stock (B) 109 shs. * 503 45,947 ------------ ------------ COEUR, INC A producer of proprietary, disposable power injection syringes 8.75% Senior Secured Term Note due 2010 $ 570,652 04/30/03 570,652 570,764 11.5% Senior Subordinated Note due 2011 $ 424,819 04/30/03 394,201 425,300 Common Stock (B) 126,812 shs. 04/30/03 126,812 143,044 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 87,672 shs. 04/30/03 40,804 98,894 ------------ ------------ 1,132,469 1,238,002 ------------ ------------ COINING CORPORATION OF AMERICA LLC A manufacturer of close tolerance parts and metal stampings. 9.77% Senior Secured Revolving Credit Facility due 2006 (C) $ 151,235 01/07/02 151,235 150,425 9.77% Senior Secured Tranche A Note due 2007 (C) $ 803,097 06/26/01 803,097 779,604 13% Senior Secured Tranche B Note due 2008 $ 648,148 06/26/01 648,148 635,277 Limited Partnership Interest (B) 6.38% int. 06/26/01 324,074 291,667 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 107,036 shs. 06/26/01 79,398 90,552 ------------ ------------ 2,005,952 1,947,525 ------------ ------------ CONNOR SPORT COURT INTERNATIONAL, INC. A designer and manufacturer of outdoor and indoor synthetic sports flooring and other temporary flooring products. 12% Senior Subordinated Note due 2012 (D) $ 2,001,121 ** 1,840,888 1,801,009 Limited Partnership Interest (B) 7.74% int. *** 189,586 1,896 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 174 shs. ** 160,233 2 ------------ ------------ 2,190,707 1,802,907 ------------ ------------ *12/30/97 and 05/29/99. **08/12/04 and 01/18/05. ***08/12/04 and 01/14/05. ---------------------------------------------------------------------------------------------------------------------------------- 9 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ CONSOLIDATED FOUNDRIES HOLDINGS A manufacturer of engineered cast metal components for the global aerospace and defense industries. 12% Senior Subordinated Note due 2013 $ 2,185,714 06/15/05 $ 2,091,220 $ 2,160,039 Common Stock (B) 364 shs. 06/15/05 364,286 327,861 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 103 shs. 06/15/05 100,668 1 ------------ ------------ 2,556,174 2,487,901 ------------ ------------ COREPHARMA LLC A manufacturer of oral dose generic pharmaceuticals targeted at niche applications. 12% Senior Subordinated Note due 2013 $ 2,550,000 08/04/05 2,418,920 2,511,968 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 20 shs. 08/04/05 137,166 -- ------------ ------------ 2,556,086 2,511,968 ------------ ------------ CORVEST GROUP, INC. A manufacturer and distributor of promotional products. 12% Senior Subordinated Note due 2007 $ 3,863,636 * 3,734,665 1,931,818 Common Stock (B) 56 shs. * 96,591 9,658 Limited Partnership Interest (B) 19.32% int. * 284,052 28,677 Warrant, exercisable until 2007, to purchase common stock at $.01 per share (B) 324 shs. * 297,203 55,700 ------------ ------------ 4,412,511 2,025,853 ------------ ------------ DEXTER MAGNETICS TECHNOLOGIES, INC. A designer, fabricator, assembler and distributor of industrial magnets and subassemblies in North America and Europe. Common Stock (B) 585 shs. 07/19/01 585,145 694,854 Warrant, exercisable until 2006, to purchase common stock at $.01 per share (B) 297 shs. 07/19/01 250,611 352,183 ------------ ------------ 835,756 1,047,037 ------------ ------------ DIRECTED ELECTRONICS, INC. A designer and distributor of brand name automotive security systems, audio products and installation accessories. Common Stock (B) 239,547 shs. 12/19/05 76,530 3,611,168 Limited Partnership Interest (B) 8.70% int. ** 49,531 1,559,019 ------------ ------------ 126,061 5,170,187 ------------ ------------ DIVERSCO, INC./DHI HOLDINGS, INC. A contract provider of janitorial and equipment maintenance services and temporary production labor to industrial customers. Membership Interests of MM/Lincap Diversco Investments Ltd. LLC (B) 27.19% int. 08/27/98 734,090 -- Preferred Stock (B) 3,278 shs. 12/14/01 2,784,133 2,505,724 Warrants, exercisable until 2011, to purchase common stock of DHI Holdings, Inc. at $.01 per share (B) 13,352 shs. *** 403,427 -- ------------ ------------ 3,921,650 2,505,724 ------------ ------------ *03/05/99 and 03/24/99. **12/22/99 and 09/14/05. ***10/24/96 and 08/28/98. ---------------------------------------------------------------------------------------------------------------------------------- 10 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ DWYER GROUP, INC. A franchiser of a variety of home repair services. 14% Senior Subordinated Note due 2011 $ 1,859,375 10/30/03 $ 1,706,599 $ 1,896,563 Common Stock (B) 6,906 shs. * 690,600 718,224 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 2,034 shs. 10/30/03 186,469 211,493 ------------ ------------ 2,583,668 2,826,280 ------------ ------------ E X C ACQUISITION CORPORATION A manufacturer of pre-filled syringes and pump systems used for intravenous drug delivery. Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 22 shs. 06/28/04 77,208 135,460 ------------ ------------ EAGLE PACK PET FOODS, INC. A manufacturer of premium pet food sold through independent pet stores. 14% Senior Subordinated Note due 2011 $ 1,062,500 09/24/04 1,028,505 1,083,750 Warrant, exercisable until 2011, to purchase common stock at $.02 per share (B) 4,085 shs. 09/24/04 39,464 71,896 ------------ ------------ 1,067,969 1,155,646 ------------ ------------ EAST RIVER VENTURES I, L.P. An acquirer of controlling or substantial interests in other entities. Limited Partnership Interest (B) 0.14% int. 01/01/01 26,855 21,706 ------------ ------------ ENZYMATIC THERAPY, INC. A manufacturer and distributor of branded natural medicines and nutritional supplements. Limited Partnership Interest (B) 1.32% int. 03/30/00 531,250 63,750 Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 29,117 shs. 03/30/00 255,000 42,500 ------------ ------------ 786,250 106,250 ------------ ------------ EURO-PRO CORPORATION A designer, marketer and distributor of floor care, steam cleaning and small kitchen products and appliances. 13.25% Senior Subordinated Note due 2011 $ 2,125,000 09/09/03 2,089,359 1,062,500 16.03% Overdue Interest Secured Note due 2008 (C) $ 143,465 01/13/06 129,118 129,118 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 43,878 shs. 09/09/03 35,641 -- ------------ ------------ 2,254,118 1,191,618 ------------ ------------ EVANS CONSOLES, INC. A designer and manufacturer of consoles and control center systems. Common Stock (B) 90,000 shs. 05/06/04 6 -- ------------ ------------ 6 -- ------------ ------------ *10/30/03 and 01/02/04. ---------------------------------------------------------------------------------------------------------------------------------- 11 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ FOWLER HOLDING, INC. A provider of site development services to residential homebuilders and developers in the Raleigh/Durham region of North Carolina. 12% Senior Subordinated Note due 2013 $ 2,365,217 02/03/06 $ 2,123,443 $ 2,311,881 Common Stock (B) 185 shs. 02/03/06 184,783 166,302 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 254 shs. 02/03/06 208,435 3 ------------ ------------ 2,516,661 2,478,186 ------------ ------------ FUEL SYSTEMS HOLDING CORPORATION An independent North American supplier of fuel tanks for a wide variety of commercial vehicles. 12% Senior Subordinated Note due 2014 $ 2,337,500 01/31/06 2,172,734 2,298,305 Common Stock (B) 212,500 shs. 01/31/06 212,500 191,250 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 138,408 shs. 01/31/06 119,213 1,384 ------------ ------------ 2,504,447 2,490,939 ------------ ------------ H M HOLDING COMPANY A designer, manufacturer, and importer of promotional and wood furniture. 12% Senior Subordinated Note due 2013 $ 2,210,000 02/10/06 2,049,848 2,169,973 Common Stock (B) 340 shs. 02/10/06 340,000 306,000 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 126 shs. 02/10/06 116,875 1 ------------ ------------ 2,506,723 2,475,974 ------------ ------------ HIGHGATE CAPITAL LLC An acquirer of controlling or substantial interests in manufacturing and marketing entities. Series A Preferred Units (B) 1.19% int. 07/21/94 367,440 2,947 ------------ ------------ HOME DECOR HOLDING COMPANY A designer, manufacturer and marketer of framed art and wall decor products. 12.5% Senior Subordinated Note due 2012 $ 2,043,269 * 1,865,497 2,052,852 Common Stock (B) 63 shs. * 62,742 71,994 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 200 shs. * 199,501 228,926 ------------ ------------ 2,127,740 2,353,772 ------------ ------------ INTEGRATION TECHNOLOGY SYSTEMS, INC. A manufacturer of steel protective computer and network systems for the industrial and office environments. 12% Senior Secured Note due 2006 $ 1,644,444 03/01/04 1,646,101 1,248,333 Common Stock (B) 228 shs. 06/01/00 262,200 -- ------------ ------------ 1,908,301 1,248,333 ------------ ------------ *06/30/04 and 08/19/04. ---------------------------------------------------------------------------------------------------------------------------------- 12 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ ITC^DELTACOM, INC. A provider of integrated communications services in the southeastern United States. 13.19% Senior Secured Note due 2009 (C) $ 2,212,704 07/26/05 $ 2,168,533 $ 2,193,180 16.69% Senior Secured Note due 2009 (C) $ 349,753 07/26/05 306,837 347,826 Warrant, exercisable until 2009, to purchase convertible preferred stock at $.01 per share (B) 102,884 shs. 07/26/05 34,295 109,057 ------------ ------------ 2,509,665 2,650,063 ------------ ------------ JASON, INC. A diversified manufacturing company serving various industrial markets. 13% Senior Subordinated Note due 2008 $ 963,687 08/04/00 911,087 948,794 14% Cumulative Redeemable Preferred Stock Series A (B) 289 shs. 08/04/00 289,224 281,890 Limited Partnership Interests of Saw Mill Capital Fund II, L.P. (B) 2.50% int. 08/03/00 886,361 709,205 Warrants, exercisable until 2008 and 2009, to purchase common stock at $.01 per share (B) 50,870 shs. 08/04/00 115,412 40,694 ------------ ------------ 2,202,084 1,980,583 ------------ ------------ JUSTRITE MANUFACTURING ACQUISITION CO. A manufacturer of safety products such as storage cabinets and containers. 12% Senior Subordinated Note due 2011 $ 1,593,750 12/15/04 1,504,202 1,553,563 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 1,121 shs. 12/15/04 101,109 11 ------------ ------------ 1,605,311 1,553,574 ------------ ------------ KEEPSAKE QUILTING, INC. A seller of quilting fabrics, books, patterns, kits and notions to consumers. 8.33% Senior Secured Revolving Note due 2006 (C) $ 36,693 06/16/00 36,693 36,604 8.33% Senior Secured Tranche A Note due 2007 (C) $ 343,995 06/16/00 343,995 340,757 12% Senior Secured Tranche B Note due 2008 $ 550,392 06/16/00 532,742 556,163 Limited Partnership Interest of Riverside XVI Holding Company, L.P. (B) 5.29% int. 06/12/00 333,490 238,027 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 1,108 shs. 06/12/00 45,866 79,071 ------------ ------------ 1,292,786 1,250,622 ------------ ------------ KELE AND ASSOCIATES, INC. A distributor of building automation control products. 12% Senior Subordinated Note due 2012 $ 1,831,548 02/27/04 1,683,675 1,850,096 Preferred Stock (B) 23 shs. 11/24/04 449,164 456,950 Common Stock (B) 12 shs. 02/27/04 12,871 175,834 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 11 shs. 02/27/04 7,793 160,940 ------------ ------------ 2,153,503 2,643,820 ------------ ------------ KEYSTONE NORTH AMERICA, INC. An operator of funeral homes in North America. Common Stock (B) 49,216 shs. 02/08/05 236,709 313,407 ------------ ------------ ---------------------------------------------------------------------------------------------------------------------------------- 13 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ LIH INVESTORS, L.P. A manufacturer and marketer of a broad line of external accessories for new and used sport utility vehicles, trucks and vans. 12.5% Senior Subordinated Note due 2008 $ 3,845,000 * $ 3,557,700 $ 3,819,407 Common Stock (B) 5,800 shs. * 406,003 223,300 Warrant, exercisable until 2006, to purchase common stock at $.11 per share (B) 15,572 shs. * 602,127 599,522 ------------ ------------ 4,565,830 4,642,229 ------------ ------------ MAVERICK ACQUISITION COMPANY A manufacturer of capsules that cover the cork and neck of wine bottles. 9.27% Senior Secured Revolving Note due 2009 (C) $ 37,220 02/21/06 37,220 36,960 9.03% Senior Secured Tranche A Note due 2010 (C) $ 724,813 09/03/04 724,813 724,977 12% Senior Secured Tranche B Note due 2011 $ 313,433 09/03/04 279,555 312,939 Limited Partnership Interest (B) 7.84% int. 09/03/04 58,769 52,892 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 425 shs. 09/03/04 39,473 4 ------------ ------------ 1,139,830 1,127,772 ------------ ------------ MAXON CORPORATION A manufacturer of industrial combustion equipment and related shut-off valves and control valves. 12% Senior Subordinated Note due 2012 $ 962,215 09/30/04 882,300 975,236 8.75% Senior Subordinated Note due 2012 $ 1,281,112 09/30/04 1,281,112 1,306,229 Common Stock (B) 381,672 shs. 09/30/04 381,672 552,661 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 153,572 shs. 09/30/04 90,897 222,372 ------------ ------------ 2,635,981 3,056,498 ------------ ------------ MEDASSIST, INC. A provider of patient eligibility and accounts receivable management services to hospitals and physician practices. 8% Preferred Stock (B) 84 shs. 10/28/04 83,658 83,402 Common Stock (B) 26,185 shs. 10/02/04 35,088 40,534 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 88,948 shs. 05/01/03 40,675 136,891 ------------ ------------ 159,421 260,827 ------------ ------------ MICROGROUP, INC. A manufacturer of precision parts and assemblies, and a value-added supplier of metal tubing and bars. 12% Senior Subordinated Note due 2013 $ 2,142,000 08/12/05 2,010,863 2,113,744 Common Stock (B) 408 shs. 08/12/05 408,000 367,200 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 137 shs. 08/12/05 137,088 1 ------------ ------------ 2,555,951 2,480,945 ------------ ------------ *12/23/98 and 01/28/99. ---------------------------------------------------------------------------------------------------------------------------------- 14 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ MONESSEN HOLDING CORPORATION A designer and manufacturer of a broad line of gas, wood, and electric hearth products and accessories. 12% Senior Subordinated Note due 2014 $ 2,550,000 03/31/06 $ 2,360,875 $ 2,518,125 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 152 shs. 03/31/06 138,125 2 ------------ ------------ 2,499,000 2,518,127 ------------ ------------ MOSS, INC. A manufacturer and distributor of large display and exhibit structures. 8.54% Senior Secured Revolving Note due 2010 (C) $ 92,647 12/21/05 90,588 91,807 8.54% Senior Secured Tranche A Note due 2010 (C) $ 350,000 12/21/05 309,853 346,550 12% Senior Secured Tranche B Note due 2010 $ 1,019,118 12/21/05 1,008,927 1,010,452 Limited Partnership Interest of Riverside Capital Appreciation Fund I, L.P. (B) 33.59% int. * 49 150,433 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 214 shs. 09/21/00 36,647 2 ------------ ------------ 1,446,064 1,599,244 ------------ ------------ MUSTANG VENTURES COMPANY A natural gas gathering and processing operation located in Oklahoma and Texas. Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 16,535 shs. 12/11/02 493,501 3,472,430 ------------ ------------ NABCO, INC. A producer of explosive containment vessels in the United States. 12% Senior Subordinated Note due 2014 $ 625,000 02/24/06 575,539 612,328 Limited Partnership Interest (B) 650 uts. 02/24/06 650,000 617,500 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 48 shs. 02/24/06 37,188 -- ------------ ------------ 1,262,727 1,229,828 ------------ ------------ NEFF MOTIVATION, INC. A manufacturer and distributor of customized awards and sportswear to schools. 12.5% Senior Subordinated Note due 2011 $ 1,062,500 01/31/03 926,187 1,090,800 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 212 shs. 01/31/03 180,625 206,053 ------------ ------------ 1,106,812 1,296,853 ------------ ------------ NONNI'S FOOD COMPANY A producer and distributor of premium biscotti and bagel chips in North America. 12.25% Senior Subordinated Note due 2012 $ 1,863,462 03/29/04 1,856,139 1,862,144 10% Preferred Stock (B) 255 shs. 03/29/04 255,083 254,288 Common Stock (B) 6,455 shs. 03/29/04 6,455 49,497 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 8,622 shs. 03/29/04 7,323 66,037 ------------ ------------ 2,125,000 2,231,966 ------------ ------------ *09/20/00 and 05/23/02. ---------------------------------------------------------------------------------------------------------------------------------- 15 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ NYLONCRAFT, INC. A supplier of engineered plastic components for the automotive industry. 9% Senior Secured Note due 2009 $ 812,500 01/28/02 $ 812,500 $ 787,875 11.5% Senior Subordinated Note due 2012 $ 1,500,000 01/28/02 1,385,638 1,403,968 Common Stock (B) 312,500 shs. 01/28/02 312,500 250,000 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 243,223 shs. 01/28/02 162,045 2,432 ------------ ------------ 2,672,683 2,444,275 ------------ ------------ O R S NASCO HOLDING, INC. A wholesale distributor of industrial supplies in North America. 13% Senior Subordinated Note due 2013 $ 2,372,732 12/20/05 2,228,018 2,311,670 Common Stock (B) 177,268 shs. 12/20/05 177,268 159,541 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 99,771 shs. 12/20/05 98,773 998 ------------ ------------ 2,504,059 2,472,209 ------------ ------------ OAKRIVER TECHNOLOGY, INC. Designs, engineers and assembles high precision automated process equipment for the medical device industry, with a focus on defibrillators and stents. 10% Senior Secured Note due 2012 $ 565,452 01/03/06 556,970 558,257 13% Senior Subordinated Note due 2013 $ 687,241 01/03/06 611,548 678,145 Common Stock (B) 322,307 shs. 01/03/06 322,307 290,076 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 72,185 shs. 01/03/06 62,824 722 ------------ ------------ 1,553,649 1,527,200 ------------ ------------ OLYMPIC SALES, INC. A boat retailer in Washington state, Oregon, California and British Columbia. 14% Senior Subordinated Note due 2006 $ 2,482,000 08/07/98 2,482,000 2,459,061 12% Senior Subordinated Note due 2008 $ 307,071 02/09/00 296,430 298,123 Limited Partnership Interest of Riverside VIII, VIII-A and VIII-B Holding Company, L.P. (B) 20.57% int. * 1,555,820 1,337,139 Warrants, exercisable until 2007 and 2008, to purchase common stock at $.01 per share (B) 28,648 shs. ** 389,188 88,695 ------------ ------------ 4,723,438 4,183,018 ------------ ------------ ONTARIO DRIVE & GEAR LTD. A manufacturer of all-wheel drive, off-road amphibious vehicles and related accessories. 13% Senior Subordinated Note due 2013 $ 1,977,885 01/17/06 1,770,654 1,951,463 Limited Partnership Interest (B) 3,667 uts. 01/17/06 572,115 514,903 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 619 shs. 01/17/06 170,801 6 ------------ ------------ 2,513,570 2,466,372 ------------ ------------ *08/07/98, 02/23/99, 12/22/99 and 02/25/03. **08/07/98 and 02/09/00. ---------------------------------------------------------------------------------------------------------------------------------- 16 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ P I I HOLDING CORPORATION A manufacturer of plastic film and bags for the general industrial, medical, and food industries. 12% Senior Subordinated Note due 2013 $ 2,295,000 03/31/06 $ 2,137,882 $ 2,250,707 Preferred Stock (B) 36 shs. 03/31/06 329,596 313,116 Common Stock (B) 23 shs. 03/31/06 25,500 22,950 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 13 shs. 03/31/06 11,122 -- ------------ ------------ 2,504,100 2,586,773 ------------ ------------ PARADIGM PACKAGING, INC. A manufacturer of plastic bottles and closures for the nutritional, pharmaceutical, personal care and food packaging markets. 12% Senior Subordinated Note due 2008 $ 2,125,000 12/19/00 1,999,084 2,117,733 Membership Interests of MM/Lincap PPI Investments, Inc., LLC (B) 2.42% int. 12/21/00 265,625 150,741 ------------ ------------ 2,264,709 2,268,474 ------------ ------------ PROTEIN GENETICS, INC. A producer of bovine artificial insemination products, related breeding and healthcare products and specialty genetics sold to the dairy and beef industries. 9.8% Redeemable Exchangeable Preferred Stock (B) 1,004 shs. 08/12/94 100,350 -- Common Stock (B) 2,600 shs. * 126,866 -- ------------ ------------ 227,216 -- ------------ ------------ QUALIS AUTOMOTIVE LLC A distributor of aftermarket automotive brake and chassis products. 12% Senior Subordinated Note due 2012 $ 1,770,834 05/28/04 1,453,161 1,779,642 Common Stock (B) 354,166 shs. 05/28/04 354,166 467,499 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 377,719 shs. 05/28/04 377,719 495,567 ------------ ------------ 2,185,046 2,742,708 ------------ ------------ QUALSERV CORPORATION A provider of foodservice equipment and supplies, to major restaurant chains and their franchisees. 14% Senior Subordinated Note due 2012 (D) $ 1,893,563 07/09/04 1,844,035 1,136,138 Limited Partnership Interest (B) 9.26% int. 07/09/04 259,146 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 528 shs. 07/09/04 49,061 -- ------------ ------------ 2,152,242 1,136,138 ------------ ------------ RADIAC ABRASIVES, INC. A manufacturer of bonded abrasive and super abrasive grinding wheels in the United States. 12% Senior Subordinated Note due 2014 $ 2,260,638 02/10/06 2,096,518 2,227,081 Common Stock (B) 289,362 02/10/06 289,362 260,424 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 131,555 02/10/06 119,796 1 ------------ ------------ 2,505,676 2,487,506 ------------ ------------ *11/14/01 and 08/12/94. ---------------------------------------------------------------------------------------------------------------------------------- 17 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ RIVER RANCH FRESH FOODS LLC A supplier of fresh produce to the retail and foodservice channels. 13% Senior Subordinated Note due 2011 (D) $ 1,841,667 09/29/04 $ 1,683,764 $ 1,657,500 Limited Partnership Interest (B) 40,610 uts. 09/29/04 283,333 -- Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 23,575 shs. 09/29/04 157,903 -- ------------ ------------ 2,125,000 1,657,500 ------------ ------------ ROYAL BATHS MANUFACTURING COMPANY A manufacturer and distributor of acrylic and cultured marble bathroom products. 12.5% Senior Subordinated Notes due 2011 $ 1,062,500 11/14/03 962,899 1,054,678 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 140 shs. 11/14/03 122,946 71,317 ------------ ------------ 1,085,845 1,125,995 ------------ ------------ SAFETY SPEED CUT MANUFACTURING COMPANY, INC. A manufacturer of vertical panel saws and routers for the wood working industry. 7.91% Senior Secured Tranche A Note due 2007 (C) $ 683,102 06/02/99 683,102 683,102 12% Senior Secured Tranche B Note Due 2007 $ 1,130,652 06/02/99 1,130,652 1,130,652 Class B Common Stock (B) 1,480 shs. 06/02/99 256,212 489,750 ------------ ------------ 2,069,966 2,303,504 ------------ ------------ SAVAGE SPORTS HOLDING, INC. A manufacturer of sporting firearms. 12% Senior Subordinated Note due 2012 $ 1,538,793 09/10/04 1,437,956 1,522,652 Common Stock (B) 586 shs. 09/10/04 586,207 478,207 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 134 shs. 09/10/04 113,578 109,001 ------------ ------------ 2,137,741 2,109,860 ------------ ------------ SPECIALTY FOODS GROUP, INC. A manufacturer and distributor of branded meat products. Limited Partnership Interest of MHD Holdings LLC (B) 1.43% int. 08/29/00 579,736 -- ------------ ------------ STRATEGIC EQUIPMENT & SUPPLY CORPORATION, INC. A provider of kitchen and restaurant design, equipment fabrication and installation services. Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 106,539 shs. 01/14/00 658,751 -- ------------ ------------ SYNVENTIVE EQUITY LLC A manufacturer of hot runner systems used in the plastic injection molding process. Limited Partnership Interest (B) 1.99% int. 08/20/03 63,207 14,100 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 86,780 shs. 08/21/03 19,359 19,359 ------------ ------------ 82,566 33,459 ------------ ------------ ---------------------------------------------------------------------------------------------------------------------------------- 18 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ TANGENT RAIL CORPORATION A manufacturer of rail ties and provides specialty services to the North American railroad industry. 13% Senior Subordinated Note due 2013 $ 2,217,385 10/14/05 $ 1,888,284 $ 2,242,567 Preferred Stock (B) 3,304 shs. 10/14/05 330,412 333,194 Common Stock (B) 2,203 shs. 10/14/05 2,203 1,983 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 1,167 shs. 10/14/05 294,403 12 ------------ ------------ 2,515,302 2,577,756 ------------ ------------ TERRA RENEWAL SERVICES, INC. A provider of wastewater residual management and required environmental reporting, permitting, nutrient management planning and record keeping to companies involved in poultry and food processing. 7.78% Senior Secured Term A Note due 2010 (C) $ 204,394 03/01/05 204,394 205,615 8.28% Senior Secured Term B Note due 2012 (C) $ 362,989 03/01/05 362,989 365,135 12% Senior Subordinated Note due 2013 $ 1,025,391 03/01/05 973,780 1,013,657 Limited Partnership Interest of Saw Mill Capital Fund V, L.P. (B) 4.00% int. 03/01/05 412,207 370,989 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 65 shs. 03/01/05 56,171 1 ------------ ------------ 2,009,541 1,955,397 ------------ ------------ THE TRANZONIC COMPANIES A producer of commercial and industrial supplies, such as safety products, janitorial supplies, work apparel, washroom and restroom supplies and sanitary care products. 13% Senior Subordinated Note due 2009 $ 2,712,000 02/05/98 2,538,475 2,712,000 Common Stock (B) 630 shs. 02/04/98 630,000 636,741 Warrant, exercisable until 2006, to purchase common stock at $.01 per share (B) 444 shs. 02/05/98 368,832 448,751 ------------ ------------ 3,537,307 3,797,492 ------------ ------------ TRANSTAR HOLDING COMPANY A distributor of aftermarket automotive transmission parts. 12% Senior Subordinated Note due 2013 $ 1,734,000 08/31/05 1,659,049 1,729,885 Common Stock (B) 816 shs. 08/31/05 816,000 775,200 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 86 shs. 08/31/05 77,485 1 ------------ ------------ 2,552,534 2,505,086 ------------ ------------ TRONAIR, INC. A designer, engineer and manufacturer of ground support equipment for the business, commuter and commercial aviation markets. 10.5% Senior Secured Term Note due 2008 $ 789,836 01/20/00 789,836 788,145 12% Senior Subordinated Note due 2010 $ 1,326,500 01/20/00 1,277,529 1,323,677 Common Stock (B) 227,400 shs. 01/20/00 227,400 204,660 Warrant, exercisable until 2010, to purchase common stock at $1 per share (B) 260,563 shs. 01/20/00 98,540 2,606 ------------ ------------ 2,393,305 2,319,088 ------------ ------------ ---------------------------------------------------------------------------------------------------------------------------------- 19 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ TRUCK BODIES & EQUIPMENT INTERNATIONAL A designer and manufacturer of accessories for heavy and medium duty trucks, primarily dump bodies, hoists, various forms of flat-bed bodies, landscape bodies and other accessories. 12% Senior Subordinated Note due 2013 $ 2,309,541 * $ 2,148,372 $ 2,348,396 Common Stock (B) 742 shs. * 800,860 1,004,517 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 153 shs. * 159,894 207,469 ------------ ------------ 3,109,126 3,560,382 ------------ ------------ TRUSTILE DOORS, INC. A manufacturer and distributor of interior doors. 12.5% Senior Subordinated Note due 2010 $ 1,062,500 04/11/03 996,450 1,048,251 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 5,781 shs. 04/11/03 95,625 44,744 ------------ ------------ 1,092,075 1,092,995 ------------ ------------ TUBULAR TEXTILE MACHINERY A designer, manufacturer, seller and servicer of finishing machinery for the knit and woven segments of the global textile industry. 12% Senior Subordinated Note due 2014 $ 1,234,551 05/28/04 1,119,173 1,184,882 8.75% Senior Secured Note due 2011 $ 716,292 05/28/04 716,292 701,954 Common Stock (B) 674,157 shs. 05/28/04 674,157 573,033 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 203,912 shs. 05/28/04 130,789 2,039 ------------ ------------ 2,640,411 2,461,908 ------------ ------------ TVI, INC. A retailer of used clothing in the United States, Canada and Australia. Common Stock (B) 354,167 shs. 05/02/00 354,167 556,042 ------------ ------------ U S M HOLDINGS CORPORATION A provider of facility maintenance services to retail and corporate clients with multiple locations 12% Senior Subordinated Note due 2011 $ 894,737 08/06/03 776,842 919,681 Preferred Stock (B) 2,571 shs. 08/06/03 257,095 257,096 Common Stock (B) 1,032 shs. 08/06/03 1,032 2,580 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 949 shs. 08/06/03 298,198 2,373 ------------ ------------ 1,333,167 1,181,730 ------------ ------------ *07/19/05 and 12/22/05. ---------------------------------------------------------------------------------------------------------------------------------- 20 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES(A)(Continued) Principal Amount Date Cost Fair Value -------------- -------- ------------ ------------ U S S HOLDINGS, INC. A producer of high grade industrial and specialty silica sands. 14% Redeemable Preferred Stock (B) 997 shs. 09/30/99 $ 545,858 $ 108,991 Convertible Preferred Stock Series A and B, convertible into common stock at $9.26 per share (B) 145,446 shs. 12/19/96 1,166,829 -- Common Stock (B) 20,027 shs. 09/30/99 799,068 -- Warrants, exercisable until 2010, to purchase common stock at $.01 per share (B) 4,918 shs. 12/19/96 128,372 -- ------------ ------------ 2,640,127 108,991 ------------ ------------ U-LINE CORPORATION A manufacturer of high-end, built-in, undercounter icemaking, wine storage and refrigeration appliances. 12.5% Senior Subordinated Note due 2012 $ 1,882,100 04/30/04 1,699,986 1,928,015 Common Stock (B) 182 shs. 04/30/04 182,200 229,572 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 230 shs. 04/30/04 211,736 290,329 ------------ ------------ 2,093,922 2,447,916 ------------ ------------ VICTORY VENTURES LLC An acquirer of controlling or substantial interests in other entities. Series A Preferred Units (B) 0.15% int. 12/02/96 1 2 ------------ ------------ VITALITY FOODSERVICE, INC. A non-carbonated beverage dispensing company focused on the foodservice industry. 13% Senior Subordinated Note due 2011 $ 1,887,288 09/24/04 1,726,120 1,867,830 Common Stock (B) 23,771 shs. 09/24/04 237,710 326,328 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 23,787 shs. 09/24/04 186,883 326,548 ------------ ------------ 2,150,713 2,520,706 ------------ ------------ VITEX PACKAGING GROUP, INC. A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags. 12.5% Senior Subordinated Note due 2012 $ 1,700,000 07/19/04 1,483,065 1,617,494 Limited Partnership Interest Class A (B) 1.75% int. 07/19/04 414,375 372,938 Limited Partnership Interest Class B (B) 0.77% int. 07/19/04 182,935 164,642 ------------ ------------ 2,080,375 2,155,074 ------------ ------------ WALLS INDUSTRIES, INC. A provider of branded workwear and sporting goods apparel. 10% Senior Subordinated Lien Note due 2009 $ 838,816 07/12/04 838,816 850,056 14% Senior Subordinated Note due 2012 $ 1,064,098 07/12/04 1,061,292 1,096,021 Limited Partnership Interest (B) 0.40% int. 07/12/04 37,281 100,659 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 4,029 shs. 07/12/04 2,833 10,842 ------------ ------------ 1,940,222 2,057,578 ------------ ------------ TOTAL PRIVATE PLACEMENT INVESTMENTS $154,869,744 $155,676,193 ------------ ------------ ---------------------------------------------------------------------------------------------------------------------------------- 21 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares or Interest Due Principal CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Rate Date Amount Cost Fair Value ------- -------- ------------ ------------ ------------ RULE 144A SECURITIES - 6.09%: BONDS - 5.52% A E S Corporation 9.000% 05/15/15 $ 200,000 $ 200,000 $ 217,000 A M C Entertainment, Inc. 11.000 02/01/16 815,000 817,381 841,486 Activant Solutions, Inc. (C) 10.530 04/01/10 825,000 825,000 841,500 Atlas Pipeline Partners 8.125 12/15/15 200,000 200,000 208,500 Blockbuster, Inc. 9.000 09/01/12 475,000 476,931 415,625 Bombardier, Inc. 6.300 05/01/14 1,000,000 890,000 917,500 Calpine Corporation 8.750 07/15/13 500,000 465,000 458,750 Charter Communications Op LLC 8.000 04/30/12 250,000 249,375 248,750 Douglas Dynamics LLC 7.750 01/15/12 630,000 633,663 611,100 Dynegy Holdings, Inc. 8.375 05/01/16 330,000 330,000 330,000 G F S I, Inc. 11.000 06/01/11 750,000 682,540 727,500 Inergy LP 8.250 03/01/16 150,000 150,000 153,375 Interactive Health LLC 7.250 04/01/11 900,000 761,330 702,000 Neiman Marcus Group, Inc. 10.375 10/15/15 1,250,000 1,250,000 1,328,125 P Q Corporation 7.500 02/15/13 1,100,000 1,088,750 1,056,000 Pregis Corporation 12.375 10/15/13 1,000,000 981,490 1,050,000 Service Corporation International (C) 7.500 06/15/17 1,000,000 90,030 1,017,500 Siebe PLC 6.500 01/15/10 650,000 572,000 614,250 Sierra Pacific Resources 6.750 08/15/17 635,000 638,257 637,381 Sungard Data Systems 9.125 08/15/13 175,000 175,000 185,063 Tekni-Plex, Inc. 10.875 08/15/12 250,000 250,000 276,875 Tekni-Plex, Inc. 8.750 11/15/13 650,000 655,964 611,000 Tenaska Alabama Partners LP 7.000 06/30/21 354,694 354,694 355,844 ------------ ------------ TOTAL BONDS 13,637,405 13,805,124 ------------ ------------ COMMON STOCK - 0.00% Jordan Telecom Products (B) 70 $ 14,000 -- ------------ ------------ TOTAL COMMON STOCK 14,000 -- ------------ ------------ CONVERTIBLE BONDS - 0.57% Cymer, Inc. 3.500% 02/15/09 $ 850,000 $ 850,000 $ 862,750 Q L T, Inc. 3.000 09/15/23 600,000 546,257 548,250 ------------ ------------ TOTAL CONVERTIBLE BONDS 1,396,257 1,411,000 ------------ ------------ WARRANTS - 0.00% Winsloew Furniture, Inc. (B) 900 $ 9 $ -- ------------ ------------ TOTAL WARRANTS 9 -- ____________ ____________ TOTAL RULE 144A SECURITIES 15,047,671 15,216,124 ____________ ____________ TOTAL CORPORATE RESTRICTED SECURITIES $169,917,415 $170,892,317 ------------ ------------ ---------------------------------------------------------------------------------------------------------------- 22 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Interest Due Principal CORPORATE PUBLIC SECURITIES - 32.36%: (A) Rate Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ BONDS - 28.59% Abitibi-Consolidated, Inc. 7.750% 06/15/11 $ 1,000,000 $ 1,030,788 $ 965,000 Activant Solutions, Inc. (C) 10.500 06/15/11 585,000 584,390 647,888 Affinia Group, Inc. 9.000 11/30/14 910,000 834,625 782,600 Alamosa Delaware, Inc. 11.000 07/31/10 325,000 329,368 361,563 Alamosa Delaware, Inc. 8.500 01/31/12 400,000 400,000 431,000 ALH Fin LLC/ALH Fin Corporation 8.500 01/15/13 950,000 918,813 931,000 Allied Waste NA 7.875 04/15/13 1,000,000 1,024,178 1,043,750 Appleton Papers, Inc. 8.125 06/15/11 300,000 300,000 301,500 Argo Tech Corporation 9.250 06/01/11 850,000 850,000 896,750 Bally Total Fitness Holding Corporation 9.875 10/15/07 135,000 128,925 135,000 BCP Crystal US Holdings Corporation 9.625 06/15/14 485,000 485,000 537,138 C C O Holdings LLC / Cap Corporation (C) 9.035 12/15/10 500,000 499,617 496,875 C S C Holdings, Inc. 7.625 04/01/11 500,000 501,817 502,500 Cablevision Systems Corporation (C) 8.716 04/01/09 1,000,000 1,000,000 1,048,750 Cadmus Communications Corporation 8.375 06/15/14 750,000 750,000 753,750 Cenveo Corporation 7.875 12/01/13 1,100,000 1,100,000 1,075,250 Charter Communication Holdings LLC 10.000 04/01/09 1,000,000 815,000 677,500 Chemed Corporation 8.750 02/24/11 1,125,000 1,125,000 1,192,500 Chesapeake Energy Corporation 7.000 08/15/14 1,075,000 1,113,663 1,099,188 Cincinnati Bell, Inc. 8.375 01/15/14 1,100,000 1,007,500 1,117,875 Clayton Williams Energy, Inc. 7.750 08/01/13 800,000 800,000 752,000 Del Monte Corporation 8.625 12/15/12 225,000 225,000 237,656 Dollar Financial Group 9.750 11/15/11 600,000 600,000 630,000 Dominos, Inc. 8.250 07/01/11 292,000 289,892 299,300 Dynegy Holdings, Inc. 6.875 04/01/11 500,000 422,500 482,500 El Paso Corporation 7.875 06/15/12 1,050,000 1,062,649 1,093,313 Esterline Technologies 7.750 06/15/13 200,000 200,000 205,500 Flextronics International Ltd. 6.500 05/15/13 400,000 400,000 397,000 Ford Motor Credit Company 7.375 10/28/09 1,250,000 1,246,874 1,175,165 Gencorp, Inc. 9.500 08/15/13 259,000 259,000 279,720 General Motors Acceptance Corporation 7.750 01/19/10 1,250,000 1,302,708 1,218,763 Geo Sub Corporation 11.000 05/15/12 600,000 595,500 591,000 Goodyear Tire & Rubber Company 7.857 08/15/11 1,400,000 1,342,750 1,368,500 Great Lakes Dredge & Dock Corporation 7.750 12/15/13 1,015,000 926,319 949,025 GulfMark Offshore, Inc. 7.750 07/15/14 565,000 562,599 576,300 Houghton Mifflin Co. 9.875 02/01/13 1,000,000 1,049,266 1,075,000 Huntsman LLC 11.625 10/15/10 324,000 320,161 366,930 Imax Corporation 9.625 12/01/10 1,000,000 1,031,395 1,060,000 Insurance Auto Auctions, Inc. 11.000 04/01/13 1,000,000 1,009,826 1,052,500 Intelsat Subsidiary Holding Company Ltd. (C) 9.614 01/15/12 450,000 449,995 457,312 Intelsat Subsidiary Holding Company Ltd. (C) 8.250 01/15/13 500,000 501,909 508,750 Iron Mountain, Inc. 6.625 01/01/16 1,000,000 951,250 940,000 Koppers, Inc. 9.875 10/15/13 477,000 477,000 522,315 Land O'Lakes, Inc. 9.000 12/15/10 750,000 750,000 798,750 Lazard LLC 7.125 05/15/15 750,000 749,407 779,166 Leucadia National Corporation 7.000 08/15/13 650,000 661,999 651,625 Liberty Media Corporation 5.700 05/15/13 1,000,000 951,610 929,910 Lodgenet Entertainment Corporation 9.500 06/15/13 425,000 425,000 459,000 Lyondell Chemical Co. 9.500 12/15/08 530,000 517,668 551,200 M G M Mirage, Inc. 6.000 10/01/09 375,000 379,102 369,375 M S X International, Inc. 11.000 10/15/07 350,000 347,004 332,500 Mac-Gray Corporation 7.625 08/15/15 600,000 600,000 612,000 ---------------------------------------------------------------------------------------------------------------- 23 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Interest Due Principal CORPORATE PUBLIC SECURITIES(A)(Continued) Rate Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ BONDS, CONTINUED Magnachip Semiconductor 8.000% 12/15/14 $ 100,000 $ 100,000 $ 93,500 Majestic Star Casino LLC 9.500 10/15/10 500,000 500,000 530,000 Manitowoc Company, Inc. 7.125 11/01/13 200,000 200,000 204,000 Markwest Energy Operating Co. 6.875 11/01/14 475,000 475,000 448,875 Mediacom LLC 9.500 01/15/13 1,000,000 1,002,685 990,000 Metaldyne Corporation 11.000 06/15/12 750,000 601,250 597,188 Metaldyne Corporation 10.000 11/01/13 510,000 513,701 476,850 Moog, Inc. 6.250 01/15/15 120,000 120,000 118,200 Mrs. Fields Brands 11.500 03/15/11 750,000 713,710 637,500 N R G Energy, Inc. 7.375 02/01/16 175,000 175,000 178,719 Nalco Co. 7.750 11/15/11 500,000 500,000 506,250 National Wine & Spirits, Inc. 10.125 01/15/09 1,135,000 1,127,806 1,143,513 Newark Group, Inc. 9.750 03/15/14 140,000 128,800 127,400 North American Energy Partners 8.750 12/01/11 400,000 400,000 390,000 Nova Chemicals Corporation (C) 7.561 11/15/13 475,000 475,000 477,375 NTL Holdings (C) 10.321 03/03/16 200,000 200,000 200,000 O E D Corp/Diamond Jo Company Guarantee 8.750 04/15/12 1,000,000 985,960 1,000,000 O M Group, Inc. 9.250 12/15/11 750,000 773,377 776,250 Offshore Logistics, Inc. 6.125 06/15/13 450,000 450,000 423,000 Pacific Energy Partners 7.125 06/15/14 500,000 503,997 508,750 Pacific Energy Partners 6.250 09/15/15 150,000 149,316 146,250 Pinnacle Foods Group 8.250 12/01/13 450,000 450,000 445,500 Pliant Corporation 11.625 06/15/09 787,891 804,299 882,438 Pogo Producing Co. 6.875 10/01/17 500,000 500,000 493,750 Primedia, Inc. 8.000 05/15/13 1,000,000 1,024,687 915,000 Quality Distribution LLC 9.100 01/15/12 325,000 323,375 321,750 Quicksilver Resources, Inc 7.125 04/01/16 500,000 500,000 493,750 Quintiles Transnational Corporation 10.000 10/01/13 500,000 500,000 576,250 Rayovac Corporation 8.500 10/01/13 200,000 200,000 185,000 Rent-A-Center, Inc. 7.500 05/01/10 400,000 400,000 400,000 Rent-Way, Inc. 11.875 06/15/10 800,000 836,954 836,000 Rhodia SA 10.250 06/01/10 519,000 530,919 581,929 Rhodia SA 8.875 06/01/11 392,000 391,739 403,760 Rock-Tenn Co. 8.200 08/15/11 1,000,000 1,007,357 992,500 Rogers Wireless, Inc. 7.250 12/15/12 165,000 165,000 173,869 Rogers Wireless, Inc. 7.500 03/15/15 870,000 931,786 933,075 Rogers Wireless, Inc. 8.000 12/15/12 165,000 165,000 175,106 Samsonite Corporation 8.875 06/01/11 1,000,000 1,041,664 1,057,500 Sbarro, Inc. 11.000 09/15/09 1,000,000 1,014,998 1,017,500 Sea Containers Ltd. 10.500 05/15/12 460,000 449,948 431,250 Sheridan Acquisition Corporation 10.250 08/15/11 375,000 370,001 385,781 Stanadyne Corporation 10.000 08/15/14 1,500,000 1,500,000 1,436,250 Tekni-Plex, Inc. 12.750 06/15/10 1,000,000 960,125 645,000 Telex Communications, Inc. 11.500 10/15/08 500,000 500,000 533,750 Telex Communications, Inc. 0.000 01/15/09 471,915 206,820 292,587 Tenet Healthcare Corporation 6.375 12/01/11 500,000 482,500 451,250 Tenet Healthcare Corporation 9.875 07/01/14 500,000 488,370 506,250 Texas Industries, Inc. 7.250 07/15/13 70,000 70,000 72,100 Thermadyne Holdings Corporation 9.250 02/01/14 1,000,000 986,250 900,000 Transmontaigne, Inc. 9.125 06/01/10 520,000 511,075 552,500 Trimas Corporation 9.875 06/15/12 375,000 318,750 343,125 Triton P C S, Inc. 8.500 06/01/13 550,000 550,000 522,500 ---------------------------------------------------------------------------------------------------------------- 24 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Shares or Interest Due Principal CORPORATE PUBLIC SECURITIES(A)(Continued) Rate Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ BONDS, CONTINUED Unisys Corporation 8.000% 10/15/12 $ 190,000 $ 190,000 $ 186,675 United Components, Inc. 9.375 06/15/13 1,080,000 1,081,901 1,042,200 United Rentals, Inc. 7.750 11/15/13 625,000 625,000 625,000 United Rentals, Inc. 7.000 02/15/14 500,000 500,000 481,250 Universal City Florida (C) 9.000 05/01/10 200,000 200,000 203,000 Universal City Florida 8.375 05/01/10 200,000 200,000 201,500 Utilicorp United, Inc. 9.950 02/01/11 1,000,000 1,089,066 1,107,500 Vertis, Inc. 10.875 06/15/09 280,000 275,400 275,100 Vicorp Restaurants, Inc. 10.500 04/15/11 750,000 734,496 699,375 Vought Aircraft Industries 8.000 07/15/11 1,000,000 1,000,239 940,000 Warner Music Group 7.375 04/15/14 275,000 275,000 272,250 Wornick Company 10.875 07/15/11 750,000 750,000 772,500 ------------ ------------ TOTAL BONDS 71,405,388 71,456,442 ------------ ------------ COMMON STOCK - 2.60% H C I Direct, Inc. (B) 1,000 $ -- $ -- PepsiAmericas, Inc. 92,145 2,006,365 2,252,945 Rent-Way, Inc. (B) 92,866 916,263 669,564 Supreme Industries, Inc. 115,722 267,325 859,814 Telex Communications, Inc. (B) 489 7 4,890 Telex Communications, Inc. (B) 17,707 1 177,075 Transmontaigne, Inc. (B) 258,720 798,595 2,538,043 ------------ ------------ TOTAL COMMON STOCK 3,988,556 6,502,331 ------------ ------------ CONVERTIBLE BONDS - 1.17% Citadel Broadcasting Corporation 1.875% 02/15/11 $ 700,000 $ 543,375 $ 570,500 Graftech International 1.625 01/15/24 1,500,000 1,083,750 1,066,875 ICOS Corporation 2.000 07/01/23 750,000 596,250 593,438 Leucadia National Corporation 3.750 04/15/14 500,000 500,000 705,625 ------------ ------------ TOTAL CONVERTIBLE BONDS 2,723,375 2,936,438 ------------ ------------ TOTAL CORPORATE PUBLIC SECURITIES $ 78,117,319 $ 80,895,211 ------------ ------------ Interest Due Principal SHORT-TERM SECURITIES: Rate/Yield Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ COMMERCIAL PAPER - 2.69% DaimlerChrysler Corporation 4.833% 04/04/06 $ 2,950,000 $ 2,948,813 $ 2,948,813 Kraft Foods, Inc. 4.772 04/03/06 3,761,000 3,760,003 3,760,003 ------------ ------------ TOTAL SHORT-TERM SECURITIES $ 6,708,816 $ 6,708,816 ------------ ------------ TOTAL INVESTMENTS 103.42% $254,743,550 $258,496,344 ============ ------------ Other Assets 5.88 14,692,727 Liabilities (9.30) (23,233,703) ------------ TOTAL NET ASSETS 100.00% $249,955,368 ====== ============ (A) In each of the convertible note, warrant, convertible preferred and common stock investments, the issuer has agreed to provide certain registration rights. (B) Non-income producing security. (C) Variable rate security; rate indicated is as of 03/31/06. (D) Defaulted security; interest not accrued. ---------------------------------------------------------------------------------------------------------------- 25 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value -------------- -------------- AEROSPACE - 2.18% BUILDINGS & REAL ESTATE - 1.53% Argo Tech Corporation $ 896,750 Adorn, Inc. $ 2,648,541 Bombardier, Inc. 917,500 Texas Industries, Inc. 72,100 Consolidated Foundries Holdings 2,487,901 TruStile Doors, Inc. 1,092,995 Esterline Technologies 205,500 -------------- Vought Aircraft Industries 940,000 3,813,636 -------------- -------------- 5,447,651 CHEMICAL, PLASTICS & RUBBER - 1.91% -------------- Capital Specialty Plastics, Inc. 45,947 AUTOMOBILE - 8.22% Huntsman LLC 366,930 Gencorp, Inc. 279,720 Koppers, Inc. 522,315 Goodyear Tire & Rubber Co. 1,368,500 Lyondell Chemical Co. 551,200 Jason, Inc. 1,980,583 Nova Chemicals Corporation 477,375 LIH Investors, L.P. 4,642,229 O M Group, Inc. 776,250 Metaldyne Corporation 1,074,038 P Q Corporation 1,056,000 Nyloncraft, Inc. 2,444,275 Rhodia SA 985,689 Ontario Drive & Gear Ltd. 2,466,372 -------------- Qualis Automotive LLC 2,742,708 4,781,706 Transtar Holding Company 2,505,086 -------------- United Components, Inc. 1,042,200 CONSUMER PRODUCTS - 6.28% -------------- ALH Fin LLC/ALH Fin Corporation 931,000 20,545,711 Appleton Papers, Inc. 301,500 -------------- Augusta Sportswear Holding Co. 2,137,084 BEVERAGE, DRUG & FOOD - 6.49% Euro-Pro Corporation 1,191,618 Beta Brands Ltd. -- G F S I, Inc. 727,500 Cains Foods, L.P. 356,927 H C I Direct, Inc. -- Del Monte Corporation 237,656 Maverick Acquisition Company 1,127,772 Dominos, Inc. 299,300 Rayovac Corporation 185,000 Eagle Pack Pet Foods, Inc. 1,155,646 Royal Baths Manufacturing Company 1,125,995 Land O'Lakes, Inc. 798,750 Savage Sports Holding, Inc. 2,109,860 Mrs. Fields Brands 637,500 The Tranzonic Companies 3,797,492 National Wine & Spirits, Inc. 1,143,513 Walls Industries, Inc. 2,057,578 Nonni's Food Company 2,231,966 Winsloew Furniture, Inc. -- PepsiAmericas, Inc. 2,252,945 -------------- Pinnacle Foods Group 445,500 15,692,399 River Ranch Fresh Foods LLC 1,657,500 -------------- Sbarro, Inc. 1,017,500 CONTAINERS, PACKAGING Specialty Foods Group, Inc. -- & GLASS - 4.86% Vicorp Restaurants, Inc. 699,375 NABCO, Inc. 1,229,828 Vitality Foodservice, Inc. 2,520,706 P I I Holding Corporation 2,586,773 Wornick Co. 772,500 Paradigm Packaging, Inc. 2,268,474 -------------- Pliant Corporation 882,438 16,227,284 Pregis Corporation 1,050,000 -------------- Sea Containers Ltd. 431,250 BROADCASTING & Tekni-Plex, Inc. 1,532,875 ENTERTAINMENT - 2.80% Vitex Packaging, Inc. 2,155,074 C C O Holdings LLC 496,875 -------------- C S C Holdings, Inc. 502,500 12,136,712 Cablevision Systems Corporation 1,048,750 -------------- Cenveo Corporation 1,075,250 DISTRIBUTION - 3.63% Charter Communications Op LLC 926,250 Affina Group, Inc. 782,600 Citadel Broadcasting Company 570,500 Corvest Group, Inc. 2,025,853 Liberty Media Corporation 929,910 Kele and Associates, Inc. 2,643,820 Lodgenet Entertainment Corporation 459,000 O R S Nasco Holding, Inc. 2,472,209 Mediacom LLC 990,000 QualServ Corporation 1,136,138 -------------- Strategic Equipment & Supply Corporation, Inc. -- 6,999,035 -------------- -------------- 9,060,620 -------------- ------------------------------------------------------------------------------------------------------------------------------------ 26 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: (Cont.) Market Value Market Value -------------- -------------- DIVERSIFIED/CONGLOMERATE, FINANCIAL SERVICES - 2.29% MANUFACTURING - 9.04% BCP Crystal US Holding Corporation $ 537,138 Activant Solutions, Inc. $ 1,489,388 Dollar Financial Group 630,000 AmerCable, Inc. 1,406,777 East River Ventures I, L.P. 21,706 Arrow Tru-Line Holdings, Inc. 2,084,305 Ford Motor Credit Co. 1,175,165 Coining Corporation of America LLC 1,947,525 General Motors Acceptance Corporation 1,218,763 Dexter Magnetics Technologies, Inc. 1,047,037 Highgate Capital LLC 2,947 Douglas Dynamics LLC 611,100 Lazard LLC 779,166 Evans Consoles, Inc. -- Leucadia National Corporation 1,357,250 Geo Sub Corporation 591,000 Victory Ventures LLC 2 Graftech International 1,066,875 -------------- Great Lakes Dredge & Dock Corporation 949,025 5,722,137 H M Holding Company 2,475,974 -------------- Justrite Manufacturing Acquisition Co. 1,553,574 HEALTHCARE, EDUCATION Radiac Abrasives, Inc. 2,487,506 & CHILDCARE - 3.28% Rock-Tenn Co. 992,500 A T I Acquisition Company 1,895,083 Trimas Corporation 343,125 American Hospice Management Holding LLC 2,672,944 Truck Bodies & Equipment International 3,560,382 ICOS Corporation 593,438 -------------- Interactive Health LLC 702,000 22,606,093 MedAssist, Inc. 260,827 -------------- Q L T, Inc. 548,250 DIVERSIFIED/CONGLOMERATE, Quintiles Transnational Corporation 576,250 SERVICE - 6.97% Tenet Healthcare Corporation 957,500 Abitibi-Consolidated, Inc. 965,000 -------------- Allied Waste NA 1,043,750 8,206,292 CapeSuccess LLC 5,862 -------------- Chemed Corporation 1,192,500 HOME & OFFICE FURNISHINGS, Diversco, Inc./DHI Holdings, Inc. 2,505,724 HOUSEWARES, AND DURABLE CONSUMER Dwyer Group, Inc. 2,826,280 PRODUCTS - 4.07% Fowler Holding, Inc. 2,478,186 Connor Sport Court International, Inc. 1,802,907 Iron Mountain, Inc. 940,000 Home Decor Holding Company 2,353,772 Keystone North America, Inc. 313,407 Monessen Holding Corporation 2,518,127 Mac-Gray Corporation 612,000 Samsonite Corporation 1,057,500 Moss, Inc. 1,599,244 U-Line Corporation 2,447,916 M S X International, Inc. 332,500 -------------- Service Corporation International 1,017,500 10,180,222 U S M Holdings Corporation 1,181,730 -------------- Universal City Florida 404,500 LEISURE, AMUSEMENT, -------------- ENTERTAINMENT - 2.18% 17,418,183 A M C Entertainment, Inc. 841,486 -------------- Bally Total Fitness Holding Corporation 135,000 ELECTRONICS - 2.74% IMAX Corporation 1,060,000 A E S Corporation 217,000 Keepsake Quilting, Inc. 1,250,622 Calpine Corporation 458,750 M G M Mirage, Inc. 369,375 Directed Electronics, Inc. 5,170,187 Majestic Star Casino LLC 530,000 Flextronics International Ltd. 397,000 O E D Corp/Diamond Jo Company Guarantee 1,000,000 Siebe PLC 614,250 Warner Music Group 272,250 -------------- -------------- 6,857,187 5,458,733 -------------- -------------- FARMING & AGRICULTURE - 0.00% Protein Genetics, Inc. -- -------------- ------------------------------------------------------------------------------------------------------------------------------------ 27 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL CORPORATE INVESTORS March 31, 2006 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: (Cont.) Market Value Market Value -------------- -------------- MACHINERY - 6.92% RETAIL STORES - 4.74% C & M Conveyor, Inc. $ 2,467,069 Blockbuster, Inc. $ 415,625 Integration Technology Systems, Inc. 1,248,333 Insurance Auto Auctions, Inc. 1,052,500 Manitowoc Company, Inc. 204,000 Neff Motivation, Inc. 1,296,853 Maxon Corporation 3,056,498 Neiman Marcus Group, Inc. 1,328,125 Safety Speed Cut Manufacturing Company, Inc. 2,303,504 Olympic Sales, Inc. 4,183,018 Stanadyne Corporation 1,436,250 Rent-A-Center, Inc. 400,000 Supreme Industries, Inc. 859,814 Rent-Way, Inc. 1,505,564 Synventive Equity LLC 33,459 TVI, Inc. 556,042 Thermadyne Holdings Corporation 900,000 United Rentals, Inc. 1,106,250 Tronair, Inc. 2,319,088 -------------- Tubular Textile Machinery 2,461,908 11,843,977 -------------- -------------- 17,289,923 TECHNOLOGY - 0.53% -------------- Cymer, Inc. 862,750 MEDICAL DEVICES/BIOTECH - 3.13% Magnachip Semiconductor 93,500 Beacon Medical Products, Inc. 2,444,157 Sungard Data Systems 185,063 Coeur, Inc. 1,238,002 Unisys Corporation 186,675 E X C Acquisition Corporation 135,460 -------------- MicroGroup, Inc. 2,480,945 1,327,988 OakRiver Technology, Inc. 1,527,200 -------------- -------------- TELECOMMUNICATIONS - 3.42% 7,825,764 Alamosa Delaware 792,563 -------------- Cincinnati Bell, Inc. 1,117,875 MINING, STEEL, IRON & Intelsat Subsidiary Holding Company Ltd. 966,062 NON PRECIOUS METALS - 0.04% ITC^DeltaCom, Inc. 2,650,063 U S S Holdings, Inc. 108,991 NTL Holdings 200,000 -------------- Rogers Wireless, Inc. 1,282,050 OIL AND GAS - 7.16% Telex Communications, Inc. 1,008,302 C & J Spec-Rent Services, Inc. 3,135,360 Triton P C S, Inc. 522,500 Chesapeake Energy Corporation 1,099,188 -------------- Clayton Williams Energy, Inc. 752,000 8,539,415 Dynegy Holdings, Inc. 812,500 -------------- Fuel Systems Holding Corporation 2,490,939 TRANSPORTATION - 1.16% GulfMark Offshore, Inc. 576,300 Quality Distribution LLC 321,750 Mustang Ventures Company 3,472,430 Tangent Rail Corporation 2,577,756 North American Energy Partners 390,000 -------------- Offshore Logistics, Inc. 423,000 2,899,506 Pacific Energy Partners 655,000 -------------- Pogo Producing Co. 493,750 UTILITIES - 1.92% Quicksilver Resources, Inc. 493,750 Atlas Pipeline Partners 208,500 Transmontaigne, Inc. 3,090,543 El Paso Corporation 1,093,313 -------------- Inergy LP 153,375 17,884,760 Markwest Energy Operating Co. 448,875 -------------- Moog, Inc. 118,200 PHARMACEUTICALS - 1.05% N R G Energy, Inc. 178,719 CorePharma LLC 2,511,968 Nalco Co. 506,250 Enzymatic Therapy, Inc. 106,250 Sierra Pacific Resources 637,381 -------------- Tenaska Alabama Partners L.P. 355,844 2,618,218 Utilicorp United, Inc. 1,107,500 -------------- -------------- PUBLISHING/PRINTING - 1.41% 4,807,957 Cadmus Communications Corporation 753,750 -------------- Houghton Mifflin Co. 1,075,000 WASTE MANAGEMENT / Newark Group, Inc. 127,400 POLLUTION - 0.78% Primedia, Inc. 915,000 Terra Renewal Services, Inc. 1,955,397 Sheridan Acquisition Corporation 385,781 -------------- Vertis, Inc. 275,100 TOTAL CORPORATE RESTRICTED AND -------------- PUBLIC SECURITIES - 100.73% $ 251,787,528 3,532,031 -------------- -------------- INCOME TAX INFORMATION The aggregate cost of investments was substantially the same for financial reporting and federal income tax purposes as of March 31, 2006. The net unrealized appreciation of investments for financial reporting and federal tax purposes as of March 31, 2006 is $3,752,794 and consists of $24,447,578 appreciation and $20,694,784 depreciation. ------------------------------------------------------------------------------------------------------------------------------------ 28 ITEM 2. CONTROLS AND PROCEDURES. (a) The principal executive officer and principal financial officer of the Registrant evaluated the effectiveness of the Registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940 (the "Act")) as of a date within 90 days of the filing date of this report and based on that evaluation have concluded that such disclosure controls and procedures are effective to provide reasonable assurance that material information required to be disclosed by the Registrant on Form N-Q is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms. (b) There were no changes in the Registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act) that occurred during the Registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting. ITEM 3. EXHIBITS. Certifications pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) are attached hereto as an exhibit. 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) MassMutual Corporate Investors ------------------------------ By (Signature and Title)* /s/ Clifford M. Noreen --------------------------------------------- Clifford M. Noreen, President Date May 30, 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 (Signature and Title)* /s/ Clifford M. Noreen --------------------------------------------- Clifford M. Noreen, President Date May 30, 2006 ------------------------------------------------------------------ By (Signature and Title)* /s/ James M. Roy --------------------------------------------- James M. Roy, Vice President and Chief Financial Officer Date May 30, 2006 ------------------------------------------------------------------ * PRINT THE NAME AND TITLE OF EACH SIGNING OFFICER UNDER HIS OR HER SIGNATURE.