================================================================================ 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 811-05531 MassMutual Participation Investors -------------------------------------------------------------------------------- (Exact name of registrant as specified in charter) 1500 Main Street, Springfield, MA 01115 -------------------------------------------------------------------------------- (Address of principal executive offices) (Zip code) Patricia J. Walsh, Vice President and Secretary, 1500 Main Street, Suite 2800, Springfield, MA 01115 -------------------------------------------------------------------------------- (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: 03/31/10 ___________________ ================================================================================ ITEM 1. SCHEDULE OF INVESTMENTS. MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES - 91.27%:(A) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ PRIVATE PLACEMENT INVESTMENTS - 87.51% A E COMPANY, INC. A designer and manufacturer of machined parts and assembly structures for the commercial and military aerospace industries. 11% Senior Secured Note due 2015 $ 807,692 * $ 791,538 $ 809,033 13% Senior Subordinated Note due 2016 $ 807,693 11/10/09 722,973 809,363 Common Stock (B) 184,615 shs. 11/10/09 184,615 175,384 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 92,308 shs. 11/10/09 68,566 923 ------------ ------------ * 11/10/09 and 11/18/09. 1,767,692 1,794,703 ------------ ------------ A H C HOLDING COMPANY, INC. A designer and manufacturer of boilers and water heaters for the commercial sector. 15% Senior Subordinated Note due 2015 $ 1,322,210 11/21/07 1,294,958 1,335,432 Limited Partnership Interest (B) 12.26% int. 11/21/07 119,009 164,232 ------------ ------------ 1,413,967 1,499,664 ------------ ------------ A S A P INDUSTRIES LLC A designer and manufacturer of components used on oil and natural gas wells. 12.5% Senior Subordinated Note due 2015 $ 450,500 12/31/08 391,316 459,510 Limited Liability Company Unit Class A-2 (B) 677 uts. 12/31/08 74,333 106,508 Limited Liability Company Unit Class A-3 (B) 608 uts. 12/31/08 66,899 95,858 ------------ ------------ 532,548 661,876 ------------ ------------ A S C GROUP, INC. A designer and manufacturer of high reliability encryption equipment, communications products, computing systems and electronic components primarily for the military and aerospace sectors. 12.75% Senior Subordinated Note due 2016 $ 1,227,273 10/09/09 1,051,875 1,241,228 Limited Liability Company Unit Class A (B) 1,249 uts. 10/09/09 122,727 116,595 Limited Liability Company Unit Class B (B) 1,473 uts. 10/09/09 144,716 15 ------------ ------------ 1,319,318 1,357,838 ------------ ------------ A W X HOLDINGS CORPORATION A provider of aerial equipment rental, sales and repair services to non-residential construction and maintenance contractors operating in the State of Indiana. 10.5% Senior Secured Term Note due 2014 $ 420,000 05/15/08 411,600 390,491 13% Senior Subordinated Note due 2015 $ 420,000 05/15/08 382,617 375,793 Common Stock (B) 60,000 shs. 05/15/08 60,000 -- Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 21,099 shs. 05/15/08 35,654 -- ------------ ------------ 889,871 766,284 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 7 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ ADVANCED TECHNOLOGIES HOLDINGS A provider of factory maintenance services to industrial companies. 15% Senior Subordinated Note due 2013 $ 1,155,508 12/27/07 $ 1,133,004 $ 1,149,722 Preferred Stock (B) 546 shs. 12/27/07 270,000 176,619 ------------ ------------ 1,403,004 1,326,341 ------------ ------------ AERO HOLDINGS, INC. A provider of geospatial services to corporate and government clients. 10.5% Senior Secured Term Note due 2014 $ 930,000 03/09/07 916,050 933,534 14% Senior Subordinated Note due 2015 $ 720,000 03/09/07 659,836 720,000 Common Stock (B) 150,000 shs. 03/09/07 150,000 -- Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 37,780 shs. 03/09/07 63,730 -- ------------ ------------ 1,789,616 1,653,534 ------------ ------------ ALL CURRENT HOLDING COMPANY A specialty re-seller of essential electrical parts and components primarily serving wholesale distributors. 12% Senior Subordinated Note due 2015 $ 603,697 09/26/08 554,905 590,342 Common Stock (B) 713 shs. 09/26/08 71,303 38,537 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 507 shs. 09/26/08 46,584 27,403 ------------ ------------ 672,792 656,282 ------------ ------------ AMERICAN HOSPICE MANAGEMENT HOLDING LLC A for-profit hospice care provider in the United States. 12% Senior Subordinated Note due 2013 $ 1,687,503 * 1,606,040 1,687,503 Preferred Class A Unit (B) 1,706 uts. ** 170,600 274,995 Preferred Class B Unit (B) 808 uts. 06/09/08 80,789 105,965 Common Class B Unit (B) 16,100 uts. 01/22/04 1 38,360 Common Class D Unit (B) 3,690 uts. 09/12/06 -- 8,792 ------------ ------------ * 01/22/04 and 06/09/08. ** 01/22/04 and 09/12/06. 1,857,430 2,115,615 ------------ ------------ APEX ANALYTIX HOLDING CORPORATION A provider of audit recovery and fraud detection services and software to commercial and retail businesses in the U.S. and Europe. 12.5% Senior Subordinated Note due 2016 $ 1,012,500 04/28/09 849,130 1,042,875 Preferred Stock Series B (B) 1,623 shs. 04/28/09 162,269 16 Common Stock (B) 723 shs. 04/28/09 723 7 ------------ ------------ 1,012,122 1,042,898 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 8 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ ARROW TRU-LINE HOLDINGS, INC. A manufacturer of hardware for residential and commercial overhead garage doors in North America. 14% Senior Subordinated Note due 2012 $ 984,209 05/18/05 $ 882,714 $ 787,367 Preferred Stock (B) 33 shs. 10/16/09 33,224 16,610 Common Stock (B) 263 shs. 05/18/05 263,298 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 69 shs. 05/18/05 59,362 -- ------------ ------------ 1,238,598 803,977 ------------ ------------ BRAVO SPORTS HOLDING CORPORATION A designer and marketer of niche branded consumer products including canopies, trampolines, in-line skates, skateboards, and urethane wheels. 12.5% Senior Subordinated Note due 2014 $ 1,207,902 06/30/06 1,151,549 1,173,119 Preferred Stock Class A (B) 465 shs. 06/30/06 141,946 64,367 Common Stock (B) 1 sh. 06/30/06 152 -- Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 164 shs. 06/30/06 48,760 22,621 ------------ ------------ 1,342,407 1,260,107 ------------ ------------ C D N T, INC. A value-added converter and distributor of specialty pressure sensitive adhesives, foams, films, and foils. 10.5% Senior Secured Term Note due 2014 $ 429,070 08/07/08 420,489 398,054 12.5% Senior Subordinated Note due 2015 $ 429,070 08/07/08 393,490 378,132 Common Stock (B) 41,860 shs. 08/07/08 41,860 -- Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 32,914 shs. 08/07/08 32,965 -- ------------ ------------ 888,804 776,186 ------------ ------------ CAPITAL SPECIALTY PLASTICS, INC. A producer of desiccant strips used for packaging pharmaceutical products. Common Stock (B) 55 shs. * 252 397,832 ------------ ------------ * 12/30/97 and 05/29/99. CLOUGH, HARBOUR AND ASSOCIATES An engineering service firm that is located in Albany, NY. 12.25% Senior Subordinated Note due 2015 $ 1,270,588 12/02/08 1,177,994 1,296,000 Preferred Stock (B) 147 shs. 12/02/08 146,594 142,990 ------------ ------------ 1,324,588 1,438,990 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 9 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ COEUR, INC. A producer of proprietary, disposable power injection syringes. 12% Senior Subordinated Note due 2016 $ 642,857 10/10/08 $ 581,786 $ 655,714 Common Stock (B) 321 shs. 10/10/08 32,143 26,808 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 495 shs. 10/10/08 48,214 41,243 ------------ ------------ 662,143 723,765 ------------ ------------ CONNECTICUT ELECTRIC, INC. A supplier and distributor of electrical products sold into the retail and wholesale markets. 12% Senior Subordinated Note due 2014 $ 1,267,387 01/12/07 1,182,283 506,955 Limited Liability Company Unit Class A (B) 82,613 uts. 01/12/07 82,613 -- Limited Liability Company Unit Class C (B) 59,756 uts. 01/12/07 59,756 -- ------------ ------------ 1,324,652 506,955 ------------ ------------ CONNOR SPORT COURT INTERNATIONAL, INC. A designer and manufacturer of outdoor and indoor synthetic sports flooring and other temporary flooring products. Preferred Stock Series B-2 (B) 9,081 shs. 07/05/07 370,796 908,072 Preferred Stock Series C (B) 4,757 shs. 07/05/07 158,912 475,708 Common Stock (B) 380 shs. 07/05/07 4 133 Limited Partnership Interest (B) 6.8 8% int. * 103,135 -- ------------ ------------ *08/12/04 and 01/14/05. 632,847 1,383,913 ------------ ------------ COREPHARMA LLC A manufacturer of oral dose generic pharmaceuticals targeted at niche applications. 12% Senior Subordinated Note due 2013 $ 1,350,000 08/04/05 1,307,274 1,350,000 Warrant, exercisable until 2013, to purchase common stock at $.001 per share (B) 10 shs. 08/04/05 72,617 109,111 ------------ ------------ 1,379,891 1,459,111 ------------ ------------ CRANE RENTAL CORPORATION A crane rental company. 13% Senior Subordinated Note due 2015 $ 1,215,000 08/21/08 1,103,928 1,239,300 Common Stock (B) 135,000 shs. 08/21/08 135,000 41,578 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 72,037 shs. 08/21/08 103,143 22,186 ------------ ------------ 1,342,071 1,303,064 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 10 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ CUSTOM ENGINEERED WHEELS, INC. A manufacturer of custom engineered, non-pneumatic plastic wheels and plastic tread cap tires used primarily for lawn and garden products and wheelchairs. 12.5% Senior Subordinated Note due 2016 $ 1,155,288 10/27/09 $ 1,002,074 $ 1,166,017 Preferred Stock PIK 156 shs. 10/27/09 156,468 148,647 Preferred Stock Series A 114 shs. 10/27/09 104,374 1 Common Stock (B) 38 shs. 10/27/09 38,244 36,328 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 28 shs. 10/27/09 25,735 -- ------------ ------------ 1,326,895 1,350,993 ------------ ------------ DAVIS-STANDARD LLC A manufacturer, assembler, and installer of a broad range of capital equipment that is used in the extrusion, conversion, and processing of plastic materials. 12% Senior Subordinated Note due 2014 $ 978,261 10/30/06 929,325 957,957 Limited Partnership Interest (B) 0.97% int. 10/30/06 371,739 416,088 Warrant, exercisable until 2014, to purchase preferred stock at $.01 per share (B) 26 shs. 10/30/06 26,380 36,240 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 18 shs. 10/30/06 18,000 16,653 ------------ ------------ 1,345,444 1,426,938 ------------ ------------ 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) 13.57% int. 08/27/98 366,495 -- Preferred Stock (B) 1,293 shs. 12/14/01 1,093,491 1,041,010 Warrants, exercisable until 2011, to purchase common stock of DHI Holdings, Inc. at $.01 per share (B) 6,676 shs. * 201,655 -- ------------ ------------ * 10/24/96 and 08/28/98. 1,661,641 1,041,010 ------------ ------------ DUNCAN SYSTEMS, INC. A distributor of windshields and side glass for the recreational vehicle market. 10% Senior Secured Term Note due 2013 $ 231,429 11/01/06 227,957 237,579 13% Senior Subordinated Note due 2014 $ 488,572 11/01/06 448,244 488,572 Common Stock (B) 102,857 shs. 11/01/06 102,857 99,363 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 32,294 shs. 11/01/06 44,663 31,197 ------------ ------------ 823,721 856,711 ------------ ------------ DWYER GROUP, INC. A franchiser of a variety of home repair services. Common Stock (B) 3,656 shs. * 365,600 615,516 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 1,077 shs. 10/30/03 98,719 181,256 ------------ ------------ *10/30/03 and 01/02/04. 464,319 796,772 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 11 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ E S P HOLDCO, INC. A manufacturer of power protection technology for commercial office equipment, primarily supplying the office equipment dealer network. 14% Senior Subordinated Note due 2015 $ 1,228,850 01/08/08 $ 1,205,952 $ 1,151,153 Common Stock (B) 349 shs. 01/08/08 174,701 21,871 ------------ ------------ 1,380,653 1,173,024 ------------ ------------ 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) 11 shs. 06/28/04 40,875 103,878 ------------ ------------ EATEM HOLDING COMPANY A developer and manufacturer of savory flavor systems for soups, sauces, gravies, and other products produced by food manufacturers for retail and foodservice end products. 12.5% Senior Subordinated Note due 2018 $ 950,000 02/01/10 823,900 944,894 Common Stock 50 shs. 02/01/10 50,000 47,500 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 119 shs. 02/01/10 107,100 1 ------------ ------------ 981,000 992,395 ------------ ------------ F C X HOLDINGS CORPORATION A distributor of specialty/technical valves, actuators, accessories, and process instrumentation supplying a number of industrial, high purity, and energy end markets in North America. 15% Senior Subordinated Note due 2015 $ 1,169,376 10/06/08 1,146,124 1,180,157 Preferred Stock (B) 2,298 shs. 10/06/08 229,804 107,624 Common Stock (B) 1,625 shs. 10/06/08 1,625 -- ------------ ------------ 1,377,553 1,287,781 ------------ ------------ F H S HOLDINGS LLC A national provider of customized disease management services to large self-insured employers. 12% Senior Subordinated Note due 2014 (D) $ 1,265,625 06/01/06 1,175,533 316,406 Limited Liability Company Units of Linden/FHS Holdings LLC (B) 84 uts. 06/01/06 84,368 -- Common Unit Class B (B) 734 uts. 06/01/06 64,779 -- ------------ ------------ 1,324,680 316,406 ------------ ------------ FLUTES, INC. An independent manufacturer of micro fluted corrugated sheet material for the food and consumer products packaging industries. 10% Senior Secured Term Note due 2013 (D) $ 524,791 04/13/06 516,919 131,198 14% Senior Subordinated Note due 2014 (D) $ 317,177 04/13/06 283,220 -- ------------ ------------ 800,139 131,198 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 12 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ GOLDEN COUNTY FOODS HOLDING, INC. A manufacturer of frozen appetizers and snacks. 16% Senior Subordinated Note due 2015 $ 1,012,500 11/01/07 $ 914,607 $ 911,250 16% PIK Note due 2015 $ 212,282 12/31/08 173,369 191,054 8% Series A Convertible Preferred Stock, convertible into fully diluted common shares (B) 77,643 shs. 11/01/07 77,643 -- ------------ ------------ 1,165,619 1,102,304 ------------ ------------ H M HOLDING COMPANY A designer, manufacturer, and importer of promotional and wood furniture. 7.5% Senior Subordinated Note due 2013 (D) $ 362,700 10/15/09 271,181 181,350 Preferred Stock (B) 21 shs. * 21,428 -- Preferred Stock Series B (B) 1,088 shs. 10/15/09 813,544 -- Common Stock (B) 180 shs. 02/10/06 180,000 -- Common Stock Class C (B) 296 shs. 10/15/09 -- -- Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 67 shs. 02/10/06 61,875 -- ------------ ------------ * 09/18/07 and 06/27/08. 1,348,028 181,350 ------------ ------------ HIGHGATE CAPITAL LLC An acquirer of controlling or substantial interests in manufacturing and marketing entities. Series A Preferred Units (B) 0.30% int. 07/21/94 91,867 -- ------------ ------------ HOME DECOR HOLDING COMPANY A designer, manufacturer and marketer of framed art and wall decor products. 12.5% Senior Subordinated Note due 2012 $ 1,081,731 * 1,028,693 1,081,731 Common Stock (B) 33 shs. * 33,216 40,781 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 106 shs. * 105,618 129,660 ------------ ------------ * 06/30/04 and 08/19/04. 1,167,527 1,252,172 ------------ ------------ HOSPITALITY MINTS HOLDING COMPANY A manufacturer of individually-wrapped imprinted promotional mints. 12% Senior Subordinated Note due 2016 $ 1,098,837 08/19/08 1,016,628 1,043,895 Common Stock (B) 251 shs. 08/19/08 251,163 52,109 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 65 shs. 08/19/08 60,233 13,469 ------------ ------------ 1,328,024 1,109,473 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 13 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ INSURANCE CLAIMS MANAGEMENT, INC. A third party administrator providing auto and property claim administration services for insurance companies. Common Stock (B) 37 shs. 02/27/07 $ 1,100 $ 93,048 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 11 shs. 02/27/07 324 27,411 ------------ ------------ 1,424 120,459 ------------ ------------ INTERNATIONAL OFFSHORE SERVICES LLC A leading provider of marine transportation services, platform decomissioning, and salvage services to oil and gas producers in the shallow waters of the Gulf of Mexico. 14.25% Senior Subordinated Secured Note due 2017 $ 1,350,000 07/07/09 1,217,417 1,350,599 Limited Liability Company Unit (B) 1,647 uts. 07/07/09 98,833 16 ------------ ------------ 1,316,250 1,350,615 ------------ ------------ JASON, INC. A diversified manufacturing company serving various industrial markets. 13% Senior Subordinated Note due 2010 $ 510,187 08/04/00 449,086 25,509 Limited Partnership Interest of Saw Mill Capital Fund II, L.P. (B) 1.30% int. 08/03/00 469,312 -- Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 26,931 shs. 08/04/00 61,101 -- ------------ ------------ 979,499 25,509 ------------ ------------ JUSTRITE MANUFACTURING ACQUISITION CO. A manufacturer of safety products such as storage cabinets and containers. 12% Senior Subordinated Note due 2011 $ 843,750 12/15/04 823,567 843,750 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 594 shs. 12/15/04 53,528 86,666 ------------ ------------ 877,095 930,416 ------------ ------------ K H O F HOLDINGS, INC. A manufacturer of premium disposable tableware products serving both the foodservice and consumer channels. 14% Senior Subordinated Note due 2014 $ 1,295,234 10/15/07 1,269,736 1,308,179 Common Stock (B) 116,827 shs. 10/15/07 116,827 124,242 ------------ ------------ 1,386,563 1,432,421 ------------ ------------ K N B HOLDINGS CORPORATION A designer, manufacturer and marketer of products for the custom framing market. 15.5% Senior Subordinated Note due 2013 $ 1,595,057 05/25/06 1,398,385 797,529 Common Stock (B) 71,053 shs. 05/25/06 71,053 -- Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 43,600 shs. 05/25/06 37,871 -- ------------ ------------ 1,507,309 797,529 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 14 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ K P I HOLDINGS, INC. Pace Industries is the largest player in the U.S. non-automotive, non-ferrous die casting segment. 13% Senior Subordinated Note due 2014 $ 1,115,217 07/16/08 $ 1,042,077 $ 836,413 Convertible Preferred Stock Series C (B) 29 shs. 06/30/09 29,348 -- Convertible Preferred Stock Series D (B) 13 shs. 09/17/09 12,958 -- Common Stock (B) 235 shs. 07/15/08 234,783 -- Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 388 shs. * 50,836 -- ------------ ------------ * 07/16/08 and 09/17/09. 1,370,002 836,413 ------------ ------------ K W P I HOLDINGS CORPORATION A manufacturer and distributor of vinyl windows and patio doors throughout the northwestern United States. 18% Senior Subordinated Note due 2014 $ 1,488,425 03/14/07 1,354,916 1,190,740 Common Stock (B) 123 shs. 03/13/07 123,000 -- Warrant, exercisable until 2019, to purchase preferred stock at $.01 per share (B) 71 shs. 07/07/09 -- -- Warrant, exercisable until 2017, to purchase common stock at $.01 per share (B) 89 shs. 03/14/07 85,890 -- ------------ ------------ 1,563,806 1,190,740 ------------ ------------ K-TEK HOLDING CORPORATION A manufacturer of instrumentation for liquid and bulk solids level detection for process and storage tanks. 14% Senior Subordinated Note due 2015 $ 1,211,004 12/20/07 1,189,114 1,223,114 Preferred Stock (B) 192,314 shs. 12/20/07 192,314 225,908 Common Stock (B) 54,326 shs. 12/20/07 543 15,186 ------------ ------------ 1,381,971 1,464,208 ------------ ------------ L H D EUROPE HOLDING, INC. A non-carbonated beverage dispensing company focused on the food service industry. Common Stock (B) 45 shs. 12/28/09 4,191 12,825 ------------ ------------ M V I HOLDING, INC. A manufacturer of large precision machined metal components used in equipment which services a variety of industries, including the oil and gas, mining, and defense markets. 13% Senior Subordinated Note due 2016 $ 652,886 09/12/08 605,133 625,998 Common Stock (B) 32 shs. 09/12/08 32,143 -- Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 35 shs. 09/12/08 34,714 -- ------------ ------------ 671,990 625,998 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 15 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ MAIL COMMUNICATIONS GROUP, INC. A provider of mail processing and handling services, lettershop services, and commercial printing services. 12.5% Senior Subordinated Note due 2014 $ 516,177 05/04/07 $ 483,072 $ 516,177 Limited Liability Company Unit (B) 12,763 uts. * 166,481 172,769 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 1,787 shs. 05/04/07 22,781 24,189 ------------ ------------ * 05/04/07 and 01/02/08. 672,334 713,135 ------------ ------------ MANHATTAN BEACHWEAR HOLDING COMPANY A designer and distributor of women's swimwear. 12.5% Senior Subordinated Note due 2018 $ 882,353 01/15/10 771,585 882,785 Common Stock (B) 118 shs. 01/15/10 117,647 111,768 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 104 shs. 01/15/10 94,579 1 ------------ ------------ 983,811 994,554 ------------ ------------ MAVERICK ACQUISITION COMPANY A manufacturer of capsules that cover the cork and neck of wine bottles. 6.79% Senior Secured Tranche A Note due 2010 (C) $ 128,230 09/03/04 128,230 127,582 12.5% Senior Secured Tranche B Note due 2011 $ 179,104 09/03/04 172,200 173,944 6.75% Senior Secured Revolver due 2011 (C) $ 29,105 09/03/04 29,105 28,641 Limited Partnership Interest (B) 4.48% int. 09/03/04 33,582 9,116 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 243 shs. 09/03/04 22,556 6,587 ------------ ------------ 385,673 345,870 ------------ ------------ MEDSYSTEMS HOLDINGS LLC A manufacturer of enteral feeding products, such as feeding tubes and other products related to assisted feeding. 13% Senior Subordinated Note due 2015 $ 617,585 08/29/08 550,695 629,936 Preferred Unit (B) 66 uts. 08/29/08 66,451 73,893 Common Unit Class A (B) 671 uts. 08/29/08 671 45,426 Common Unit Class B (B) 250 uts. 08/29/08 63,564 16,902 ------------ ------------ 681,381 766,157 ------------ ------------ MEGTEC HOLDINGS, INC. A supplier of industrial and environmental products and services to a broad array of industries. 12% Senior Subordinated Note due 2016 $ 1,144,068 09/24/08 1,048,910 1,086,865 Preferred Stock (B) 56 shs. 09/24/08 54,040 6,298 Limited Partnership Interest (B) 0.74% int. 09/16/08 205,932 -- Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 18 shs. 09/24/08 18,237 -- ------------ ------------ 1,327,119 1,093,163 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 16 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 (D) $ 1,421,795 * $ 1,367,708 $ 1,208,526 Common Stock (B) 238 shs. * 238,000 -- Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 87 shs. * 86,281 -- ------------ ------------ *08/12/05 and 09/11/06. 1,691,989 1,208,526 ------------ ------------ MILWAUKEE GEAR COMPANY A manufacturer of high-precision custom gears and gear drives used by original equipment manufacturers operating in a number of industries. 13% Senior Subordinated Note due 2014 $ 1,246,154 07/21/08 1,180,575 1,121,539 Preferred Stock (B) 139 shs. 07/21/08 138,374 -- Common Stock (B) 9 shs. 07/21/08 10,000 -- Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 6 shs. 07/21/08 5,510 -- ------------ ------------ 1,334,459 1,121,539 ------------ ------------ MOMENTUM HOLDING CO. A designer and supplier of upholstery fabric to commercial furniture manufacturers and architectural and design firms. Limited Partnership Interest (B) 11.24% int. 08/04/06 56,198 137,914 Warrant, exercisable until 2014, to purchase common stock at $.02 per share (B) 586 shs. 08/04/06 56,705 143,759 ------------ ------------ 112,903 281,673 ------------ ------------ MONESSEN HOLDING CORPORATION A designer and manufacturer of a broad line of gas, wood, and electric hearth products and accessories. 14% Senior Subordinated Note due 2014 (D) $ 1,350,000 07/25/08 1,275,187 675,000 14% PIK Note due 2014 (D) $ 419,713 07/25/08 342,435 209,856 Warrant, exercisable until 2014, to purchase common stock at $.02 per share (B) 81 shs. 03/31/06 73,125 -- ------------ ------------ 1,690,747 884,856 ------------ ------------ NABCO, INC. A producer of explosive containment vessels in the United States. 14% Senior Subordinated Note due 2014 $ 330,882 02/24/06 304,577 165,441 Limited Liability Company Unit (B) 437 uts. * 436,984 -- Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 68 shs. 02/24/06 19,687 -- ------------ ------------ * 02/24/06 and 06/22/07. 761,248 165,441 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 17 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ NAVIS GLOBAL A designer, manufacturer, seller and servicer of finishing machinery for the knit and woven segments of the global textile industry. 12% Senior Secured Term Note Series A due 2010 $ 16,854 11/14/08 $ 16,854 $ 16,854 14% Senior Subordinated Note due 2014 (D) $ 764,921 05/28/04 660,453 -- 10.75% Senior Secured Note due 2011 (D) $ 348,118 05/28/04 347,086 87,030 ------------ ------------ 1,024,393 103,884 ------------ ------------ NESCO HOLDINGS CORPORATION A sales and leasing company that provides equipment to the electric utility, telecommunications, and various other industries. 12% Senior Secured Subordinated Note due 2015 $ 1,125,000 08/02/07 999,658 1,136,250 Common Stock (B) 225,000 shs. 08/02/07 225,000 246,348 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 63,191 shs. 08/02/07 102,842 69,186 ------------ ------------ 1,327,500 1,451,784 ------------ ------------ NETSHAPE TECHNOLOGIES, INC. A manufacturer of powder metal and metal injection molded precision components used in industrial, consumer, and other applications. 12% Senior Subordinated Note due 2014 $ 810,000 02/02/07 745,713 600,380 Limited Partnership Interest of Saw Mill PCG Partners LLC (B) 1.38% int. 02/01/07 539,990 -- Limited Liability Company Unit Class D of Saw Mill PCG Partners LLC (B) 8 uts. * 8,147 4,075 Limited Liability Company Unit Class D- 1 of Saw Mill PCG Partners LLC (B) 43 uts. 09/30/09 43,293 21,651 Preferred Stock Class A (B) 1 sh. 12/18/08 726 360 Preferred Stock Class A-1 (B) 4 shs. 09/30/09 3,757 1,875 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 48 shs. 02/02/07 48,087 -- ------------ ------------ * 12/18/09 and 09/30/09. 1,389,713 628,341 ------------ ------------ NORTHWEST MAILING SERVICES, INC. A producer of promotional materials for companies that use direct mail as part of their customer retention and loyalty programs. 12% Senior Subordinated Note due 2016 $ 1,207,895 07/09/09 1,009,721 1,256,211 Limited Partnership Interest (B) 1,421, uts. 07/09/09 142,105 135,000 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 1,852 shs. 07/09/09 185,163 19 ------------ ------------ 1,336,989 1,391,230 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 18 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ NYLONCRAFT, INC. A supplier of engineered plastic components for the automotive industry. 10% Senior Secured Note due 2012 $ 464,286 01/28/02 $ 464,286 $ 348,215 15% Senior Subordinated Note due 2012 (D) $ 285,714 01/28/02 270,653 -- Convertable Preferred Stock A (B) 571 shs. 01/28/02 549,507 -- Common Stock (B) 178,571 shs. 01/28/02 178,571 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 138,928 shs. 01/28/02 92,597 -- ------------ ------------ 1,555,614 348,215 ------------ ------------ 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 $ 83,264 01/03/06 82,015 85,948 13% Senior Subordinated Note due 2013 $ 392,709 01/03/06 364,097 392,709 Common Stock (B) 184,176 shs. 01/03/06 184,176 126,563 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 43,073 shs. 01/03/06 35,900 29,599 ------------ ------------ 666,188 634,819 ------------ ------------ OLYMPIC SALES, INC. A boat retailer in Washington state, Oregon, California and British Columbia. 12% Senior Subordinated Note due 2010 (D) $ 511,000 08/07/98 511,000 76,650 12% Senior Subordinated Note due 2010 (D) $ 244,154 02/09/00 213,313 36,623 ------------ ------------ 724,313 113,273 ------------ ------------ ONTARIO DRIVE & GEAR LTD. A manufacturer of all-wheel drive, off-road amphibious vehicles and related accessories. Limited Liability Company Unit (B) 1,942 uts. 01/17/06 302,885 245,664 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 328 shs. 01/17/06 90,424 41,477 ------------ ------------ 393,309 287,141 ------------ ------------ P A S HOLDCO LLC An independent provider of maintenance, repair and overhaul services to the aerospace gas turbine engine and airframe markets. 14% Senior Subordinated Note due 2014 $ 1,236,634 07/03/06 1,188,058 1,249,000 Preferred Unit (B) 202 uts. 07/03/06 202,320 298,842 Preferred Unit (B) 36 uts. 07/03/06 36,420 53,795 Common Unit Class I (B) 78 uts. 07/03/06 -- 388,947 Common Unit Class L (B) 17 uts. 07/03/06 -- 82,168 ------------ ------------ 1,426,798 2,072,752 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 19 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage 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 $ 1,215,000 03/31/06 $ 1,159,806 $ 1,215,000 Preferred Stock (B) 19 shs. 03/31/06 174,492 238,730 Common Stock (B) 12 shs. 03/31/06 13,500 85,483 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 7 shs. 03/31/06 5,888 49,742 ------------ ------------ 1,353,686 1,588,955 ------------ ------------ PACIFIC CONSOLIDATED HOLDINGS LLC A manufacturer of rugged, mobile liquid and gaseous oxygen and nitrogen generating systems used in the global defense, oil and gas, and medical sectors. 14% Senior Subordinated Note due 2012 $ 704,835 04/27/07 665,346 612,732 Limited Liability Company Unit (B) 928,962 uts. 04/27/07 33,477 -- ------------ ------------ 698,823 612,732 ------------ ------------ 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 2011 $ 1,125,000 12/19/00 1,091,569 1,120,195 Membership Interests of MM/Lincap PPI Investments, Inc., LLC (B) 1.28% int. 12/21/00 140,625 153,013 ------------ ------------ 1,232,194 1,273,208 ------------ ------------ PEARLMAN ENTERPRISES, INC. A developer and distributor of tools, equipment and supplies to the natural and engineered stone industry. Preferred Stock Series A (B) 1,236 shs. 05/22/09 59,034 -- Preferred Stock Series B (B) 7,059 shs. 05/22/09 290,050 -- Common Stock (B) 21.462 shs. 05/22/09 993,816 -- ------------ ------------ 1,342,900 -- ------------ ------------ POSTLE ALUMINUM COMPANY LLC A manufacturer and distributor of aluminum extruded products. 3% Senior Subordinated PIK Note due 2014 (D) $ 1,163,700 10/02/06 1,066,355 -- Limited Liability Company Unit Class A 733 uts. 10/02/06 270,000 -- Limited Liability Company Unit 76 uts. 05/22/09 38,140 36,049 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 4,550 shs. 10/02/06 65,988 -- ------------ ------------ 1,440,483 36,049 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 20 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ POWER SERVICES HOLDING COMPANY A provider of industrial motor repair services, predictive and preventative maintenance, and performance improvement consulting serving the petrochemical, mining, power generation, metals, and paper industries. 12% Senior Subordinated Note due 2016 $ 1,255,814 02/11/08 $ 1,156,924 $ 1,213,755 Limited Partnership Interest (B) 12.55% int. 02/11/08 94,092 15,969 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 700 shs. 02/11/08 88,723 31,473 ------------ ------------ 1,339,739 1,261,197 ------------ ------------ PRECISION WIRE HOLDING COMPANY A manufacturer of specialty medical wires that are used in non-elective minimally invasive surgical procedures. 14.25% Senior Subordinated Note due 2016 $ 1,357,886 11/12/09 1,219,517 1,358,455 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 109 shs. 11/12/09 107,970 1 ------------ ------------ 1,327,487 1,358,456 ------------ ------------ QUALIS AUTOMOTIVE LLC A distributor of aftermarket automotive brake and chassis products. 13% Senior Subordinated Note due 2012 $ 922,612 05/28/04 846,452 972,132 Common Stock (B) 187,500 shs. 05/28/04 187,500 189,055 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 199,969 shs. 05/28/04 199,969 201,628 ------------ ------------ 1,233,921 1,362,815 ------------ ------------ RAJ MANUFACTURING HOLDINGS LLC A designer and manufacturer of women's swimwear sold under a variety of licensed brand names. 14.5% Senior Subordinated Note due 2014 $ 1,288,627 12/15/06 1,188,371 1,159,764 Limited Liability Company Unit (B) 1,497 uts. 12/15/06 149,723 3,294 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 2 shs. 12/15/06 69,609 1,554 ------------ ------------ 1,407,703 1,164,612 ------------ ------------ R E I DELAWARE HOLDING, INC. An engineer and manufacturer of highly complex, close tolerance components, assemblies, tooling and custom automation equipment primarily for aerospace, medical and defense/radar markets. 12% Senior Subordinated Note due 2016 $ 1,350,000 01/18/08 1,306,541 1,349,445 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 3 shs. 01/18/08 16,459 18,564 ------------ ------------ 1,323,000 1,368,009 ------------ ------------ ROYAL BATHS MANUFACTURING COMPANY A manufacturer and distributor of acrylic and cultured marble bathroom products. 12.5% Senior Subordinated Note due 2011 $ 562,500 11/14/03 543,731 554,278 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 74 shs. 11/14/03 65,089 33,702 ------------ ------------ 608,820 587,980 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 21 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ SAFETY SPEED CUT MANUFACTURING COMPANY, INC. A manufacturer of vertical panel saws and routers for the wood working industry. Class B Common Stock (B) 846 shs. 06/02/99 $ 146,456 $ 141,337 SAVAGE SPORTS HOLDING, INC. A manufacturer of sporting firearms. 12% Senior Subordinated Note due 2012 $ 814,655 09/10/04 787,404 814,655 Common Stock (B) 324 shs. * 340,378 551,415 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 71 shs. 09/10/04 60,129 120,392 ------------ ------------ * 09/10/04 and 10/05/07. 1,187,911 1,486,462 ------------ ------------ SENCORE HOLDING COMPANY A designer, manufacturer, and marketer of decoders, receivers and modulators sold to broadcasters, satellite, cable and telecom operators for encoding/decoding analog and digital transmission video signals. 12.5% Senior Subordinated Note due 2014 $ 934,615 01/15/09 824,097 845,057 Common Stock (B) 69 shs. 01/15/09 69,231 17,308 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 149 shs. 01/15/09 149,084 1 ------------ ------------ 1,042,412 862,366 ------------ ------------ SMART SOURCE HOLDINGS LLC A short-term computer rental company. 12% Senior Subordinated Note due 2015 $ 1,176,924 * 1,083,855 1,141,812 Limited Liability Company Unit (B) 328 uts. * 334,371 211,095 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 83 shs. * 87,231 53,471 ------------ ------------ * 08/31/07 and 03/06/08. 1,505,457 1,406,378 ------------ ------------ SPARTAN FOODS HOLDING COMPANY A manufacturer of branded pizza crusts and pancakes. 12.5% Senior Subordinated Note due 2017 $ 1,012,500 12/15/09 874,322 1,013,989 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 136 shs. 12/15/09 120,234 1 ------------ ------------ 994,556 1,013,990 ------------ ------------ SPECIALTY COMMODITIES, INC. A distributor of specialty food ingredients. 13.25% Senior Subordinated Note due 2016 $ 1,212,720 10/23/08 1,140,663 1,236,974 Common Stock (B) 15,882 shs. 10/23/08 158,824 105,102 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 5,852 shs. 10/23/08 53,285 38,727 ------------ ------------ 1,352,772 1,380,803 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 22 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ STANTON CARPET HOLDING CO. A designer and marketer of high and mid-priced decorative carpets and rugs. 12.13% Senior Subordinated Note due 2014 $ 1,185,366 08/01/06 $ 1,128,392 $ 1,110,254 Common Stock (B) 165 shs. 08/01/06 164,634 19,117 Warrant, exercisable until 2014, to purchase common stock at $.02 per share (B) 55 shs. 08/01/06 49,390 6,367 ------------ ------------ 1,342,416 1,135,738 ------------ ------------ SUNDANCE INVESTCO LLC A provider of post-production services to producers of movies and television shows. Limited Liablility Company Unit Class A 3,405 shs. 03/31/10 -- -- ------------ ------------ SYNTERACT HOLDINGS CORPORATION A provider of outsourced clinical trial management services to pharmaceutical and biotechnology companies. 4% Senior Subordinated Note due 2016 $ 1,371,709 09/02/08 1,285,871 1,389,500 Redeemable Preferred Stock Series A (B) 678 shs. 09/02/08 6,629 6,675 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 6,778 shs. 09/02/08 59,661 -- ------------ ------------ 1,352,161 1,396,175 ------------ ------------ T H I ACQUISITION, INC. A machine servicing company providing value-added steel services to long steel products. 12% Senior Subordinated Note due 2016 $ 1,350,000 01/14/08 1,276,383 1,080,000 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 5 shs. 01/14/08 46,617 -- ------------ ------------ 1,323,000 1,080,000 ------------ ------------ TANGENT RAIL CORPORATION A manufacturer of rail ties and provider of specialty services to the North American railroad industry. 13% Senior Subordinated Note due 2015 $ 1,173,909 10/14/05 1,033,473 1,173,909 Common Stock (B) 1,167 shs. 10/14/05 1,167 700,092 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 631 shs. 09/30/08 300,683 378,541 ------------ ------------ 1,335,323 2,252,542 ------------ ------------ TELECORPS HOLDINGS, INC. A provider of equipment and services to producers of television shows and motion pictures. 12.75% Senior Subordinated Note due 2016 $ 1,681,677 * 1,474,695 1,597,593 Common Stock (B) 143 shs. 09/02/09 5,823 4,367 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 4,187 shs. * 173,349 42 ------------ ------------ * 05/20/09 and 09/02/09. 1,653,867 1,602,002 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 23 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ TERRA RENEWAL LLC 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. 12% Senior Subordinated Note due 2014 $ 664,062 * $ 638,669 $ 541,077 6.79% Term Note due 2012 (C) $ 781,483 * 778,758 720,350 8.75% Term Note due 2012 (C) $ 826 * 826 762 Limited Partnership Interest of Saw Mill Capital Fund V, LLC (B) 2.27% int. ** 85,245 -- Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 41 shs. 04/28/06 33,738 -- ------------ ------------ * 04/28/06 and 09/13/06. ** 03/01/05 and 10/10/08. 1,537,236 1,262,189 ------------ ------------ TORRENT GROUP HOLDINGS, INC. A contractor specializing in the sales and installation of engineered drywells for the retention and filtration of stormwater and nuisance water flow. 12.5% Senior Subordinated Note due 2013 (D) $ 1,185,366 10/26/07 1,113,016 -- Series A Preferred Stock (B) 219 shs. 10/26/07 219,203 -- ------------ ------------ 1,332,219 -- ------------ ------------ TOTAL E & S, INC. A manufacturer of a wide variety of equipment used in the oil and gas industry. 10.5% Senior Secured Term Note due 2013 $ 486,487 03/02/07 479,190 462,163 13% Senior Subordinated Note due 2014 (D) $ 341,971 03/02/07 280,347 170,986 ------------ ------------ 759,537 633,149 ------------ ------------ TRANSPAC HOLDING COMPANY A designer, importer, and wholesaler of home decor and seasonal gift products. 12% Senior Subordinated Note due 2015 (D) $ 938,651 10/31/07 873,498 844,786 Common Stock (B) 110 shs. 10/31/07 110,430 -- Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 50 shs. 10/31/07 46,380 -- ------------ ------------ 1,030,308 844,786 ------------ ------------ TRANSTAR HOLDING COMPANY A distributor of aftermarket automotive transmission parts. 12% Senior Subordinated Note due 2014 $ 918,000 08/31/05 891,755 927,180 Common Stock (B) 571 shs. * 570,944 710,156 Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 46 shs. 08/31/05 41,021 56,595 ------------ ------------ * 08/31/05 and 04/30/07. 1,503,720 1,693,931 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 24 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ TRANZONIC COMPANIES (THE) 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 2010 $ 1,356,000 02/05/98 $ 1,341,285 $ 1,356,000 Common Stock (B) 315 shs. 02/04/98 315,000 354,703 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 222 shs. 02/05/98 184,416 249,981 ------------ ------------ 1,840,701 1,960,684 ------------ ------------ TRUCK BODIES & EQUIPMENT INTERNATIONAL A designer and manufacturer of accessories for heavy and medium duty trucks, primarily dump bodies, hoists, various forms of flatbed bodies, landscape bodies and other accessories. 16% Senior Subordinated Note due 2010 (D) $ 1,222,698 * 1,133,973 305,675 Preferred Stock Series B (B) 128 shs. 10/20/08 127,677 -- Common Stock (B) 393 shs. * 423,985 -- Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 81 shs. * 84,650 -- Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 558 shs. 10/20/08 -- -- ------------ ------------ * 07/19/05 and 12/22/05. 1,770,285 305,675 ------------ ------------ TRUSTILE DOORS, INC. A manufacturer and distributor of interior doors. Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 3,060 shs. 04/11/03 36,032 55,750 ------------ ------------ U M A ENTERPRISES, INC. An importer and wholesaler of home decor products. 15% Senior Subordinated Note due 2015 $ 938,797 02/08/08 918,330 917,339 Convertible Preferred Stock (B) 470 shs. 02/08/08 469,565 143,512 ------------ ------------ 1,387,895 1,060,851 ------------ ------------ U-LINE CORPORATION A manufacturer of high-end, built-in, undercounter ice making, wine storage and refrigeration appliances. 14.5% Senior Subordinated Note due 2012 $ 996,500 04/30/04 951,560 847,025 14.5% PIK Note due 2012 $ 139,125 10/06/09 118,256 118,256 Common Stock (B) 96 shs. 04/30/04 96,400 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 122 shs. 04/30/04 112,106 -- ------------ ------------ 1,278,322 965,281 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 25 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ VISIONEERING, INC. A designer and manufacturer of tooling and fixtures for the aerospace industry. 10.5% Senior Secured Term Loan due 2013 $ 458,824 05/17/07 $ 451,932 $ 449,687 13% Senior Subordinated Note due 2014 $ 370,588 05/17/07 340,377 354,964 18% PIK Convertable Preferred Stock (B) 21,361 shs. 03/13/09 41,440 33,152 Common Stock (B) 70,588 shs. 05/17/07 70,588 -- Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 20,003 shs. 05/17/07 31,460 -- ------------ ------------ 935,797 837,803 ------------ ------------ VITEX PACKAGING GROUP, INC. A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags. 10% Senior Subordinated PIK Note due 2011 (D) $ 85,308 07/19/04 76,813 81,042 5% Senior Subordinated PIK Note due 2011 (D) $ 450,000 06/30/07 392,576 427,500 Class B Unit (B) 406,525 uts. 10/29/09 184,266 -- Class C Unit (B) 450,000 uts. 10/29/09 413,244 104,071 Limited Liability Company Unit Class A (B) 383,011 uts. * 229,353 -- Limited Liability Company Unit Class B (B) 96,848 uts. 07/19/04 96,848 -- ------------ ------------ * 07/19/04 and 10/29/09. 1,393,100 612,613 ------------ ------------ WAGGIN' TRAIN HOLDINGS LLC A producer of premium quality meat dog treats. 14% Senior Subordinated Note due 2014 $ 1,180,960 11/15/07 1,156,854 1,192,769 Limited Liability Company Unit Class B (B) 224 uts. 11/15/07 223,757 264,871 Limited Liability Company Unit Class C (B) 224 uts. 11/15/07 -- 224,829 ------------ ------------ 1,380,611 1,682,469 ------------ ------------ WALLS INDUSTRIES, INC. A provider of branded workwear and sporting goods apparel. Limited Partnership Interest (B) 0.20% int. 07/12/04 1,974 -- Common Stock (B) 2,133 shs. 12/21/07 -- -- ------------ ------------ 1,974 -- ------------ ------------ WELLBORN FOREST HOLDING CO. A manufacturer of semi-custom kitchen and bath cabinetry. 14.13% Senior Subordinated Note due 2014 $ 911,250 11/30/06 858,237 774,563 Common Stock (B) 101 shs. 11/30/06 101,250 4,537 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 51 shs. 11/30/06 45,790 2,265 ------------ ------------ 1,005,277 781,365 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 26 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ WORKPLACE MEDIA HOLDING CO. A direct marketer specializing in providing advertisers with access to consumers in the workplace. 13% Senior Subordinated Note due 2015 $ 613,692 05/14/07 567,390 569,242 Limited Partnership Interest (B) 12.26% int. 05/14/07 61,308 -- Warrant, exercisable until 2015, to purchase common stock at $.02 per share (B) 47 shs. 05/14/07 44,186 -- ------------ ------------ 672,884 569,242 ------------ ------------ XALOY SUPERIOR HOLDINGS, INC. A provider of melt processing components and ancillary equipment for both plastic injection molding and extrusion applications. 15.5% Senior Subordinated Note due 2015 (D) $ 1,229,741 09/08/08 1,203,293 614,870 Common Stock (B) 150 shs. 09/08/08 150,000 -- ------------ ------------ 1,353,293 614,870 ------------ ------------ TOTAL PRIVATE PLACEMENT INVESTMENTS (E) 115,733,457 97,697,290 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 27 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Shares or Interest Due Principal Market CORPORATE RESTRICTED SECURITIES:(A)(Continued) Rate Date Amount Cost Value ------- -------- ------------ ------------ ------------ RULE 144A SECURITIES - 3.76%: BONDS - 3.76% ACCO Brands Corporation 10.625% 03/15/15 $ 45,000 $ 44,369 $ 49,163 Advanced Micro Devices, Inc. 8.125 12/15/17 190,000 180,510 196,888 Appleton Papers, Inc. 11.250 12/15/15 252,000 250,000 231,840 Avis Budget Car Rental LLC 9.625 03/15/18 40,000 39,454 41,800 Cenveo Corporation 10.500 08/15/16 45,000 45,000 45,844 Coffeyville Resources LLC 9.000 04/01/15 70,000 69,658 71,225 Compucom Systems, Inc. 12.500 10/01/15 670,000 651,902 710,200 CONSOL Energy, Inc. 8.250 04/01/20 15,000 15,000 15,413 Douglas Dynamics LLC 7.750 01/15/12 485,000 461,640 489,850 Eastman Kodak Co. 9.750 03/01/18 375,000 367,422 367,500 G F S I, Inc. (C) 10.500 06/01/11 358,000 343,948 266,263 Gannett Company, Inc. 9.375 11/15/17 60,000 59,149 64,200 Headwaters, Inc. 11.375 11/01/14 45,000 44,580 46,969 International Lease Finance Corporation 8.625 09/15/15 75,000 73,811 76,670 JohnsonDiversey, Inc. 8.250 11/15/19 45,000 44,627 46,575 L B I Escrow Corporation 8.000 11/01/17 100,000 100,000 103,500 New Communications Holdings, Inc. 8.250 04/15/17 500,000 500,000 505,625 Sealed Air Corporation 7.875 06/15/17 500,000 492,505 542,913 Sinclair Television Group, Inc. 9.250 11/01/17 200,000 194,727 211,000 T W Telecom Holdings, Inc. 8.000 03/01/18 10,000 9,928 10,175 ViaSystems, Inc. 12.000 01/15/15 100,000 96,458 108,500 ------------ ------------ TOTAL BONDS 4,084,688 4,202,113 ------------ ------------ CONVERTIBLE PREFERRED STOCK - 0.00% ETEX Corporation (B) 194 179 -- ------------ ------------ TOTAL CONVERTIBLE PREFERRED STOCK 179 -- ------------ ------------ PREFERRED STOCK - 0.00% TherOX, Inc. (B) 26 1,032 -- ------------ ------------ TOTAL PREFERRED STOCK 1,032 -- ------------ ------------ COMMON STOCK - 0.00% Touchstone Health Partnership (B) 292 1,062 -- ------------ ------------ TOTAL COMMON STOCK 1,062 -- ------------ ------------ TOTAL RULE 144A SECURITIES 4,086,961 4,202,113 ------------ ------------ TOTAL CORPORATE RESTRICTED SECURITIES $119,820,418 $101,899,403 ------------ ------------ ---------------------------------------------------------------------------------------------------------------- 28 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Interest Due Principal Market CORPORATE PUBLIC SECURITIES - 15.19%: (A) Rate Date Amount Cost Value ------- -------- ------------ ------------ ------------ BONDS - 14.62% Affinia Group, Inc. 9.000% 11/30/14 $ 25,000 $ 24,250 $ 24,875 Allegheny Technologies, Inc. 9.375 06/12/19 500,000 521,416 581,761 Allied Waste NA 7.125 05/15/16 500,000 506,234 543,125 American General Finance Corporation 6.500 09/15/17 250,000 215,000 213,073 C R H America, Inc. 5.300 10/15/13 500,000 418,430 532,601 Centurytel, Inc. 5.000 02/15/15 500,000 516,354 509,463 Citigroup, Inc. 5.500 04/11/13 500,000 437,890 525,391 Cytec Industries, Inc. 8.950 07/01/17 600,000 603,889 722,702 Equifax, Inc. 4.450 12/01/14 500,000 518,268 513,187 Exide Corporation 10.500 03/15/13 250,000 252,683 253,750 Gencorp, Inc. 9.500 08/15/13 130,000 130,000 132,113 General Electric Capital Corporation 5.500 01/08/20 500,000 498,050 510,133 Goldman Sachs Group, Inc. 4.750 07/15/13 500,000 418,645 528,596 Goodyear Tire & Rubber Co. 10.500 05/15/16 50,000 48,108 54,000 Intelsat Jackson Holdings 9.250 06/15/16 690,000 714,194 696,900 International Game Technology 7.500 06/15/19 500,000 499,720 566,320 International Lease Finance Corporation 5.875 05/01/13 500,000 448,188 480,166 Iron Mountain, Inc. 8.750 07/15/18 500,000 512,614 523,750 Johnson Controls, Inc. 5.500 01/15/16 500,000 398,125 535,334 Manitowoc Company, Inc. 7.125 11/01/13 100,000 100,000 99,750 Markwest Energy Operating Co. 6.875 11/01/14 35,000 27,789 34,300 Masco Corporation 7.125 03/15/20 350,000 349,993 352,185 Morgan Stanley 5.500 01/26/20 500,000 497,305 489,070 Nortek, Inc. 11.000 12/01/13 100,444 98,956 107,726 Owens Corning, Inc. 9.000 06/15/19 30,000 29,516 35,175 Qwest Diagnostic, Inc. 4.750 01/30/20 500,000 498,665 488,947 Rental Service Corporation 9.500 12/01/14 175,000 175,677 173,250 Sheridan Acquisition Corporation 10.250 08/15/11 225,000 222,001 223,313 Speedway Motorsports, Inc. 8.750 06/01/16 35,000 33,949 37,275 Sprint Capital Corporation 6.900 05/01/19 440,000 405,225 402,600 Stewart & Stevenson LLC 10.000 07/15/14 735,000 754,880 707,434 Teck Resources Ltd. 10.750 05/15/19 30,000 28,559 36,750 Texas Industries, Inc. 7.250 07/15/13 35,000 35,000 34,388 The Valspar Corporation 7.250 06/15/19 500,000 501,466 564,907 Ticketmaster Entertainment, Inc. 10.750 07/28/16 250,000 250,000 278,750 Time Warner Cable, Inc. 5.000 02/01/20 500,000 489,790 492,991 Titan International, Inc. 8.000 01/15/12 70,000 70,000 70,000 Tube City IMS Corporation 9.750 02/01/15 1,000,000 989,449 983,750 ---------------------------------------------------------------------------------------------------------------- 29 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Shares or Interest Due Principal Market CORPORATE PUBLIC SECURITIES:(A)(Continued) Rate Date Amount Cost Value ------- -------- ------------ ------------ ------------ Tyco International Group SA 8.500% 01/15/19 $ 500,000 $ 457,495 $ 550,093 Tyco International Group SA 6.550 10/01/17 125,000 124,996 154,897 United Components, Inc. 9.375 06/15/13 535,000 535,269 537,675 Verso Paper Holdings LLC 9.125 08/01/14 500,000 486,875 485,000 W P P Finance Corporation 5.875 06/15/14 500,000 508,096 528,698 ------------ ------------ TOTAL BONDS 15,353,009 16,316,164 ------------ ------------ COMMON STOCK - 0.56% CKX, Inc. (B) 52,500 422,625 321,825 Directed Electronics, Inc. (B) 195,118 982,867 87,803 ITC^DeltaCom, Inc. (B) 94,588 827,645 191,068 Intrepid Potash, Inc. (B) 185 5,920 5,611 Nortek, Inc. (B) 100 1 4,000 Rue21, Inc. (B) 350 6,650 12,135 ------------ ------------ TOTAL COMMON STOCK 2,245,708 622,442 ------------ ------------ CONVERTIBLE BONDS - 0.01% Citadel Broadcasting Corporation 4.000% 02/15/11 $ 250,000 194,063 13,750 ------------ ------------ TOTAL CONVERTIBLE BONDS 194,063 13,750 ------------ ------------ TOTAL CORPORATE PUBLIC SECURITIES $ 17,792,780 $ 16,952,356 ------------ ------------ Interest Due Principal Market SHORT-TERM SECURITIES: Rate/Yield^ Date Amount Cost Value ------- -------- ------------ ------------ ------------ COMMERCIAL PAPER - 1.97% Sabmiller PLC 0.270% 04/05/10 $ 2,200,000 2,199,934 2,199,934 ------------ ------------ TOTAL SHORT-TERM SECURITIES 2,199,934 2,199,934 ------------ ------------ TOTAL INVESTMENTS 108.43% $139,813,132 $121,051,693 ============ ------------ Other Assets 4.62 5,161,413 Liabilities (13.05) (14,574,114) ------ ------------ TOTAL NET ASSETS 100.00% $111,638,992 ====== ============ (A) In each of the convertible note, warrant, 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 03/31/10. (D) Defaulted security; interest not accrued. (E) Illiquid security. As of March 31, 2010, the values of these securities amounted to $97,697,290 or 87.51% of net assets. ^ Effective yield at purchase PIK - Payment-in-kind ---------------------------------------------------------------------------------------------------------------- 30 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value -------------- -------------- AEROSPACE - 4.33% BUILDINGS & REAL ESTATE - 1.49% A E Company, Inc. $ 1,794,703 K W P I Holdings Corporation $ 1,190,740 Gencorp, Inc. 132,113 Masco Corporation 352,185 P A S Holdco LLC 2,072,752 Owens Corning, Inc. 35,175 Visioneering, Inc. 837,803 Texas Industries, Inc. 34,388 -------------- TruStile Doors, Inc. 55,750 4,837,371 -------------- -------------- 1,668,238 AUTOMOBILE - 4.63% -------------- Exide Corporation 253,750 CHEMICAL, PLASTICS & RUBBER - 0.35% Goodyear Tire & Rubber Co. 54,000 Capital Specialty Plastics, Inc. 397,832 Jason, Inc. 25,509 -------------- Johnson Controls, Inc. 535,334 CONSUMER PRODUCTS - 9.61% Nyloncraft, Inc. 348,215 Aero Holdings, Inc. 1,653,534 Ontario Drive & Gear Ltd. 287,141 Bravo Sports Holding Corporation 1,260,107 Qualis Automotive LLC 1,362,815 Custom Engineered Wheels, Inc. 1,350,993 Titan International, Inc. 70,000 Eastman Kodak Co. 367,500 Transtar Holding Company 1,693,931 G F S I, Inc. 266,263 United Components, Inc. 537,675 JohnsonDiversey, Inc. 46,575 -------------- K N B Holdings Corporation 797,529 5,168,370 Manhattan Beachwear Holding Company 994,554 -------------- Momentum Holding Co. 281,673 BEVERAGE, DRUG & FOOD - 8.51% R A J Manufacturing Holdings LLC 1,164,612 Eatem Holding Company 992,395 Royal Baths Manufacturing Company 587,980 Golden County Foods Holding, Inc. 1,102,304 The Tranzonic Companies 1,960,684 Hospitality Mints Holding Company 1,109,473 Walls Industries, Inc. -- L H D Europe Holding, Inc. 12,825 -------------- Sabmiller PLC 2,199,934 10,732,004 Spartan Foods Holding Company 1,013,990 -------------- Specialty Commodities, Inc. 1,380,803 CONTAINERS, PACKAGING & GLASS - 4.02% Waggin' Train Holdings LLC 1,682,469 Flutes, Inc. 131,198 -------------- Maverick Acquisition Company 345,870 9,494,193 P I I Holding Corporation 1,588,955 -------------- Paradigm Packaging, Inc. 1,273,208 BROADCASTING & ENTERTAINMENT - 1.95% Sealed Air Corporation 542,913 Citadel Broadcasting Corporation 13,750 Vitex Packaging Group, Inc. 612,613 CKX, Inc. 321,825 -------------- Sinclair Television Group, Inc. 211,000 4,494,757 Speedway Motorsports, Inc. 37,275 -------------- Time Warner Cable, Inc. 492,991 DISTRIBUTION - 1.92% WPP Finance Corporation 528,698 Duncan Systems, Inc. 856,711 Workplace Media Holding Co. 569,242 F C X Holdings Corporation 1,287,781 -------------- -------------- 2,174,781 2,144,492 -------------- -------------- ------------------------------------------------------------------------------------------------------------------------------------ 31 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION:(Continued) Market Value Market Value -------------- -------------- DIVERSIFIED/CONGLOMERATE, ELECTRONICS - 0.53% MANUFACTURING - 8.18% Connecticut Electric, Inc. $ 506,955 A H C Holdings Company, Inc. $ 1,499,664 Directed Electronics, Inc. (B) 87,803 Arrow Tru-Line Holdings, Inc. 803,977 -------------- C D N T, Inc. 776,186 594,758 Douglas Dynamics LLC 489,850 -------------- Headwaters, Inc. 46,969 FINANCIAL SERVICES - 2.62% K P I Holdings, Inc. 836,413 American General Finance Corporation 213,073 MEGTEC Holdings, Inc. 1,093,163 Citigroup, Inc. 525,391 Milwaukee Gear Company 1,121,539 General Electric Capital Corporation 510,133 Nortek, Inc. 111,726 Goldman Sachs Group, Inc. 528,596 Northwest Mailing Services, Inc. 1,391,230 Highgate Capital LLC -- Postle Aluminum Company LLC 36,049 International Lease Finance Corporation 556,836 Truck Bodies & Equipment International 305,675 L B I Escrow Corporation 103,500 Xaloy Superior Holdings, Inc. 614,870 Morgan Stanley 489,070 -------------- -------------- 9,127,311 2,926,599 -------------- -------------- DIVERSIFIED/CONGLOMERATE, SERVICE - 12.28% HEALTHCARE, EDUCATION & CHILDCARE - 3.87% A S C Group, Inc. 1,357,838 American Hospice Management Holding LLC 2,115,615 A W X Holdings Corporation 766,284 F H S Holdings LLC 316,406 ACCO Brands Corporation 49,163 Qwest Diagnostic, Inc. 488,947 Advanced Technologies Holdings 1,326,341 Synteract Holdings Corporation 1,396,175 Affinia Group, Inc. 24,875 Touchstone Health Partnership -- Apex Analytix Holding Corporation 1,042,898 -------------- C R H America, Inc. 532,601 4,317,143 Clough, Harbour and Associates 1,438,990 -------------- Crane Rental Corporation 1,303,064 HOME & OFFICE FURNISHINGS, HOUSEWARES, Diversco, Inc./DHI Holdings, Inc. 1,041,010 AND DURABLE CONSUMER PRODUCTS - 9.72% Dwyer Group, Inc. 796,772 Connor Sport Court International, Inc. 1,383,913 Equifax, Inc. 513,187 H M Holding Company 181,350 Insurance Claims Management, Inc. 120,459 Home Decor Holding Company 1,252,172 Iron Mountain, Inc. 523,750 Justrite Manufacturing Acquisition Co. 930,416 Mail Communications Group, Inc. 713,135 K H O F Holdings, Inc. 1,432,421 Nesco Holdings Corporation 1,451,784 Monessen Holding Corporation 884,856 Pearlman Enterprises, Inc. -- Stanton Carpet Holding Co. 1,135,738 Tyco International Group 704,990 Transpac Holdings Company 844,786 -------------- U M A Enterprises, Inc. 1,060,851 13,707,141 U-Line Corporation 965,281 -------------- Wellborn Forest Holding Co. 781,365 -------------- 10,853,149 -------------- ------------------------------------------------------------------------------------------------------------------------------------ 32 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION:(Continued) Market Value Market Value -------------- -------------- LEISURE, AMUSEMENT, ENTERTAINMENT - 2.09% NATURAL RESOURCES - 1.86% International Game Technology $ 566,320 Appleton Papers, Inc. $ 231,840 Savage Sports Holding, Inc. 1,486,462 Cenveo Corporation 45,844 Ticketmaster Entertainment, Inc. 278,750 CONSOL Energy, Inc. 15,413 -------------- Cytec Industries, Inc. 722,702 2,331,532 Intrepid Potash, Inc. 5,611 -------------- The Valspar Corporation 564,907 MACHINERY - 9.20% Verso Paper Holdings LLC 485,000 A S A P Industries LLC 661,876 -------------- Davis-Standard LLC 1,426,938 2,071,317 E S P Holdco, Inc. 1,173,024 -------------- K-Tek Holdings Corporation 1,464,208 OIL & GAS - 1.84% M V I Holding, Inc. 625,998 Coffeyville Resources LLC 71,225 Manitowoc Company, Inc. 99,750 International Offshore Services LLC 1,350,615 Navis Global 103,884 Total E & S, Inc. 633,149 NetShape Technologies, Inc. 628,341 -------------- Pacific Consolidated Holdings LLC 612,732 2,054,989 Power Services Holding Company 1,261,197 -------------- R E I Delaware Holding, Inc. 1,368,009 PHARMACEUTICALS - 1.31% Safety Speed Cut Manufacturing Company, Inc. 141,337 CorePharma LLC 1,459,111 Stewart & Stevenson LLC 707,434 -------------- -------------- 1,459,111 10,274,728 -------------- -------------- PUBLISHING/PRINTING - 0.26% MEDICAL DEVICES/BIOTECH - 4.30% Gannett Company, Inc. 64,200 Coeur, Inc. 723,765 Sheridan Acquisition Corporation 223,313 E X C Acquisition Corporation 103,878 -------------- ETEX Corporation -- 287,513 MedSystems Holdings LLC 766,157 -------------- MicroGroup, Inc. 1,208,526 RETAIL STORES - 0.27% OakRiver Technology, Inc. 634,819 Olympic Sales, Inc. 113,273 Precision Wire Holding Company 1,358,456 Rental Service Corporation 173,250 TherOX, Inc. -- Rue21, Inc. 12,135 -------------- -------------- 4,795,601 298,658 -------------- -------------- MINING, STEEL, IRON & TECHNOLOGY - 2.94% NON-PRECIOUS METALS - 2.40% Advanced Micro Devices, Inc. 196,888 Allegheny Technology, Inc. 581,761 Compucom Systems, Inc. 710,200 T H I Acquisition, Inc. 1,080,000 Sencore Holding Company 862,366 Teck Resources, Ltd. 36,750 Smart Source Holdings LLC 1,406,378 Tube City IMS Corporation 983,750 ViaSystems, Inc. 108,500 -------------- -------------- 2,682,261 3,284,332 -------------- -------------- ------------------------------------------------------------------------------------------------------------------------------------ 33 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) March 31, 2010 (Unaudited) Fair Value/ INDUSTRY CLASSIFICATION:(Continued) Market Value -------------- TELECOMMUNICATIONS - 4.10% All Current Holding Company $ 656,282 Centurytel, Inc. 509,463 Intelsat Bermuda Ltd. 696,900 ITC^DeltaCom, Inc. 191,068 New Communications Holdings, Inc. 505,625 Spirit Capital Corporation 402,600 Sundance Investco LLC -- T W Telecom Holdings, Inc. 10,175 Telecorps Holdings, Inc. 1,602,002 -------------- 4,574,115 -------------- TRANSPORTATION - 2.20% Avis Budget Car Rental LLC 41,800 NABCO, Inc. 165,441 Tangent Rail Corporation 2,252,542 -------------- 2,459,783 -------------- UTILITIES - 0.03% Markwest Energy Operating Co. $ 34,300 -------------- WASTE MANAGEMENT / POLLUTION - 1.62% Allied Waste NA 543,125 Terra Renewal LLC 1,262,189 Torrent Group Holdings, Inc. -- -------------- 1,805,314 -------------- Total Investments - 108.43% $ 121,051,693 ============== See Notes to Consolidated Financial Statements ------------------------------------------------------------------------------------------------------------------------------------ 34 INCOME TAX INFORMATION The aggregate cost of investments is substantially the same for financial reporting and federal income tax purposes as of March 31, 2010. The net unrealized depreciation of investments for financial reporting and federal tax purposes as of March 31, 2010 is $18,761,439 and consists of $ 10,198,296 appreciation and $28,959,735 depreciation. FAIR VALUE MEASUREMENTS In accordance with the authoritative guidance on fair value measurements and disclosures under accounting principles generally accepted in the United States of America ("U.S. GAAP"), the Trust discloses the fair value of its investments in a hierarchy that prioritizes the inputs to valuation techniques used to measure the fair value. The hierarchy gives the highest priority to valuations based upon unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurement) and the lowest priority to valuations based upon unobservable inputs that are significant to the valuation (level 3 measurements). The guidance establishes three levels of the fair value hierarchy as follows: Level 1: quoted prices in active markets for identical securities Level 2: other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) Level 3: significant unobservable inputs (including the Trust's own assumptions in determining the fair value of investments) The inputs and methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. The following is a summary of the inputs used to value the Trust's net assets as of March 31, 2010: ASSETS: TOTAL LEVEL 1 LEVEL 2 LEVEL 3 -------------------------------------------------------------------------------- Restricted Securities Bonds $ 86,464,525 $ -- $ 4,202,113 $82,262,412 Common Stock 7,822,943 -- -- 7,822,943 Preferred Stock 3,738,173 -- -- 3,738,173 Partnerships and LLCs 3,873,762 -- -- 3,873,762 Public Securities Bonds 16,329,914 -- 16,329,914 -- Common Stock 622,441 618,441 4,000 -- Preferred Stock -- -- -- -- Short-term Securities 2,199,934 -- 2,199,934 -- -------------------------------------------------------------------------------- Total $121,051,692 $ 618,441 $22,735,961 $97,697,290 Following is a reconciliation of Level 3 assets for which significant unobservable inputs were used to determine fair value: Unrealized Total gains Purchases, gains & losses Beginning or losses sales, issuances Transfers in Ending in net income balance (realized/ & settlements and/or balance at from assets Assets: at 12/31/2009 unrealized) (net) out of Level 3 03/31/2010 still held --------------------------------------------------------------------------------------------------------------------------------- Restricted Securities Bonds $81,465,949 $ (685,514) $1,937,878 $ (455,900) $82,262,413 $ (709,340) Common Stock 7,767,378 (313,762) 369,326 -- 7,822,942 (313,762) Preferred Stock 3,468,130 268,791 1,252 -- 3,738,173 268,791 Partnerships and LLCs 3,536,247 323,084 14,431 -- 3,873,762 323,084 --------------------------------------------------------------------------------------------------------------------------------- $96,237,704 $ (407,401) $2,322,887 $ (455,900) $97,697,290 $ (431,227) 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 has 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 Participation Investors ---------------------------------- By (Signature and Title)* /s/ Michael L. Klofas --------------------------------------------- Michael L. Klofas, President Date May 28, 2010 ------------------------------------------------------------------ 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/ Michael L. Klofas --------------------------------------------- Michael L. Klofas, President Date May 28, 2010 ------------------------------------------------------------------ By (Signature and Title)* /s/ James M. Roy --------------------------------------------- James M. Roy, Vice President and Chief Financial Officer Date May 28, 2010 ------------------------------------------------------------------ * PRINT THE NAME AND TITLE OF EACH SIGNING OFFICER UNDER HIS OR HER SIGNATURE.