================================================================================ 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, Secretary and Chief Legal Officer 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: 09/30/10 ___________________ ================================================================================ CONSOLIDATED SCHEDULE OF INVESTMENTS September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES - 88.56%:(A) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ PRIVATE PLACEMENT INVESTMENTS - 85.66% 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 $ 831,652 13% Senior Subordinated Note due 2016 $ 807,693 11/10/09 722,973 839,017 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 1,846,976 ------------ ------------ 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 $ 1,342,450 11/21/07 1,315,376 1,355,875 Limited Partnership Interest (B) 12.26% int. 11/21/07 119,009 211,457 ------------ ------------ 1,434,385 1,567,332 ------------ ------------ 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 74,333 114,819 Limited Liability Company Unit Class A-3 (B) 608 uts. 12/31/08 66,899 103,338 ------------ ------------ 532,548 677,667 ------------ ------------ 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 1,264,091 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 1,380,701 ------------ ------------ 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 (D) $ 420,000 05/15/08 411,600 315,000 13% Senior Subordinated Note due 2015 (D) $ 420,000 05/15/08 375,946 -- 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 -- ------------ ------------ 883,200 315,000 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 8 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 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 $ 1,172,906 12/27/07 $ 1,150,436 $ 1,184,635 Preferred Stock (B) 546 shs. 12/27/07 270,000 271,516 ------------ ------------ 1,420,436 1,456,151 ------------ ------------ AERO HOLDINGS, INC. A provider of geospatial services to corporate and government clients. 10.5% Senior Secured Term Note due 2014 $ 930,000 03/09/07 916,050 930,000 14% Senior Subordinated Note due 2015 $ 720,000 03/09/07 663,647 720,000 Common Stock (B) 150,000 shs. 03/09/07 150,000 256,500 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 37,780 shs. 03/09/07 63,730 64,604 ------------ ------------ 1,793,427 1,971,104 ------------ ------------ 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 09/26/08 557,538 609,734 Common Stock (B) 713 shs. 09/26/08 71,303 54,627 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 507 shs. 09/26/08 46,584 38,844 ------------ ------------ 675,425 703,205 ------------ ------------ 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. ** 170,600 286,167 Preferred Class B Unit (B) 808 uts. 06/09/08 80,789 115,493 Common Class B Unit (B) 16,100 uts. 01/22/04 1 51,245 Common Class D Unit (B) 3,690 uts. 09/12/06 -- 11,745 ------------ ------------ * 01/22/04 and 06/09/08. ** 01/22/04 and 09/12/06. 1,857,430 2,152,153 ------------ ------------ 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 04/28/09 861,372 1,032,750 Preferred Stock Series B (B) 1,623 shs. 04/28/09 162,269 254,727 Common Stock (B) 723 shs. 04/28/09 723 113,528 ------------ ------------ 1,024,364 1,401,005 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 9 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 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. 12% Senior Subordinated Note due 2012 $ 984,209 05/18/05 $ 882,714 $ 836,577 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 -- ------------ ------------ 1,238,598 853,187 ------------ ------------ ASSOCIATED DIVERSIFIED SERVICES A provider of routine maintenance and repair services primarily to electric utility companies predominantly on electric power distribution lines. 10% Senior Secured Term Note due 2016 (C) $ 323,700 09/30/10 323,700 331,509 13% Senior Subordinated Note due 2017 $ 296,180 09/30/10 296,180 328,435 Limited Liability Company Unit Class B (B) 36,000 uts. 09/30/10 36,000 34,200 Limited Liability Company Unit Class B OID (B) 27,520 uts. 09/30/10 27,520 275 ------------ ------------ 683,400 694,419 ------------ ------------ BARCODES GROUP, INC. A distibutor and reseller of automatic identification and data capture equipment, including mobile computers, scanners, point-of-sale systems, labels, and accessories. 13.5% Senior Subordinated Note due 2016 $ 638,651 07/27/10 606,420 654,020 Preferred Stock (B) 13 shs. 07/27/10 131,496 124,925 Common Stock Class A (B) 44 shs. 07/27/10 437 415 Warrant, exercisable until 2020, to purchase common stock at $.01 per share (B) 8 shs. 07/27/10 76 -- ------------ ------------ 738,429 779,360 ------------ ------------ 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 1,154,442 1,207,902 Preferred Stock Class A (B) 465 shs. 06/30/06 141,946 84,428 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 29,671 ------------ ------------ 1,345,300 1,322,001 ------------ ------------ 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 $ 377,112 08/07/08 373,019 359,355 12.5% Senior Subordinated Note due 2015 $ 429,070 08/07/08 395,705 390,249 Common Stock (B) 41,860 shs. 08/07/08 41,860 19,281 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 32,914 shs. 08/07/08 32,965 15,160 ------------ ------------ 843,549 784,045 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 10 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ CAPITAL SPECIALTY PLASTICS, INC. A producer of desiccant strips used for packaging pharmaceutical products. Common Stock (B) 55 shs. * $ 252 $ 587,055 *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. 12/02/08 146,594 145,508 ------------ ------------ 1,324,588 1,441,508 ------------ ------------ 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 20,321 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 495 shs. 10/10/08 48,214 31,263 ------------ ------------ 662,143 707,298 ------------ ------------ CONNECTICUT ELECTRIC, INC. A supplier and distributor of electrical products sold into the retail and wholesale markets. 10% Senior Subordinated Note due 2014 (D) $ 771,051 01/12/07 719,275 385,526 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 -- Limited Liability Company Unit Class D (B) 671,525 uts. 05/03/10 -- -- Limited Liability Company Unit Class E (B) 1,102 uts. 05/03/10 -- -- ------------ ------------ 861,644 385,526 ------------ ------------ 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 4 271 Limited Partnership Interest (B) 6.88% int. * 103,135 -- ------------ ------------ *08/12/04 and 01/14/05. 632,847 1,384,051 ------------ ------------ 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 1,311,683 1,350,000 Warrant, exercisable until 2013, to purchase common stock at $.001 per share (B) 10 shs. 08/04/05 72,617 127,518 ------------ ------------ 1,384,300 1,477,518 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 11 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ CRANE RENTAL CORPORATION A crane rental company. 13% Senior Subordinated Note due 2015 $ 1,215,000 08/21/08 $ 1,109,821 $ 1,212,223 Common Stock (B) 135,000 shs. 08/21/08 135,000 -- Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 72,037 shs. 08/21/08 103,143 -- ------------ ------------ 1,347,964 1,212,223 ------------ ------------ 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 1,189,947 Preferred Stock PIK (B) 156 shs. 10/27/09 156,468 148,647 Preferred Stock Series A (B) 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 1,374,923 ------------ ------------ 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 10/30/06 932,143 964,791 Limited Partnership Interest (B) 0.97% int. 10/30/06 371,739 402,833 Warrant, exercisable until 2014, to purchase preferred stock at $.01 per share (B) 26 shs. 10/30/06 26,380 38,074 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 18 shs. 10/30/06 18,000 13,028 ------------ ------------ 1,348,262 1,418,726 ------------ ------------ 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 -- Warrants, exercisable until 2011, to purchase common stock of DHI Holdings, Inc. at $.01 per share (B) 6,676 shs. * 201,655 236,518 ------------ ------------ *10/24/96 and 08/28/98. 568,150 236,518 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 12 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 $ 236,797 13% Senior Subordinated Note due 2014 $ 488,572 11/01/06 451,010 488,572 Common Stock (B) 102,857 shs. 11/01/06 102,857 89,494 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 32,294 shs. 11/01/06 44,663 28,099 ------------ ------------ 826,487 842,962 ------------ ------------ DWYER GROUP, INC. A franchiser of a variety of home repair services. Common Stock (B) 3,656 shs. * 365,600 641,230 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 1,077 shs. 10/30/03 98,719 188,828 ------------ ------------ *10/30/03 and 01/02/04. 464,319 830,058 ------------ ------------ 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 $ 1,241,169 01/08/08 1,217,802 1,228,175 Common Stock (B) 349 shs. 01/08/08 174,701 56,045 ------------ ------------ 1,392,503 1,284,220 ------------ ------------ 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 40,585 ------------ ------------ 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 02/01/10 823,900 975,521 Common Stock (B) 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 1,023,022 ------------ ------------ 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 $ 1,186,983 10/06/08 1,164,123 1,225,365 Preferred Stock (B) 2,298 shs. 10/06/08 229,804 112,579 Common Stock (B) 1,625 shs. 10/06/08 1,625 -- ------------ ------------ 1,395,552 1,337,944 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 13 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ F F C HOLDING CORPORATION A leading U.S. manufacturer of private label frozen novelty and ice cream products. 16% Senior Subordinated Note due 2014 $ 829,268 09/27/10 $ 812,683 $ 827,903 Limited Liability Company Units Preferred (B) 171 uts. 09/27/10 153,659 145,974 Limited Liability Company Units (B) 171 uts. 09/27/10 17,073 16,219 ------------ ------------ 983,415 990,096 ------------ ------------ 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 -- 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 -- ------------ ------------ 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 04/13/06 516,919 262,396 14% Senior Subordinated Note due 2014 (D) $ 317,177 04/13/06 283,220 -- ------------ ------------ 800,139 262,396 ------------ ------------ GOLDEN COUNTY FOODS HOLDING, INC. A manufacturer of frozen appetizers and snacks. 16% Senior Subordinated Note due 2015 $ 1,012,500 11/01/07 914,607 961,875 16% PIK Note due 2015 $ 250,259 12/31/08 211,238 237,746 8% Series A Convertible Preferred Stock, convertible into fully diluted common shares (B) 77,643 shs. 11/01/07 77,643 7,556 ------------ ------------ 1,203,488 1,207,177 ------------ ------------ H M HOLDING COMPANY A designer, manufacturer, and importer of promotional and wood furniture. 7.5% Senior Subordinated Note due 2013 (D) $ 362,700 10/15/09 271,181 272,025 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. 1,348,028 272,025 ------------ ------------ 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 -- ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 14 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 * $ 1,020,116 $ 1,081,731 Common Stock (B) 33 shs. * 33,216 52,744 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 106 shs. * 105,618 167,694 ------------ ------------ * 06/30/04 and 08/19/04. 1,158,950 1,302,169 ------------ ------------ 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 59,845 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 65 shs. 08/19/08 60,233 15,469 ------------ ------------ 1,328,024 1,119,209 ------------ ------------ 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 1,100 140,272 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 11 shs. 02/27/07 324 41,322 ------------ ------------ 1,424 181,594 ------------ ------------ 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 1,360,394 Limited Liability Company Unit (B) 1,647 uts. 07/07/09 98,833 -- ------------ ------------ 1,316,250 1,360,394 ------------ ------------ JASON, INC. A diversified manufacturing company serving various industrial markets. 13% Senior Subordinated Note due 2010 (D) $ 510,187 08/04/00 449,086 25,509 Limited Partnership Interest of Saw Mill Capital Fund II, L.P. (B) 1.30% int. 08/03/00 469,308 -- ------------ ------------ 918,394 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 12/15/04 828,112 843,750 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 594 shs. 12/15/04 53,528 111,409 ------------ ------------ 881,640 955,159 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 15 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ K H O F HOLDINGS, INC. A manufacturer of premium disposable tableware products serving both the foodservice and consumer channels. Common Stock (B) 116,827 shs. 10/15/07 $ 71,515 $ 99,511 ------------ ------------ K N B HOLDINGS CORPORATION A designer, manufacturer and marketer of products for the custom framing market. 15.5% Senior Subordinated Note due 2013 (D) $ 1,595,057 05/25/06 1,398,385 1,515,304 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 1,515,304 ------------ ------------ K P I HOLDINGS, INC. The largest player in the U.S. non-automotive, non-ferrous die casting segment. 18% Senior Subordinated Note due 2014 (D) $ 1,115,217 07/16/08 1,042,077 1,059,456 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 1,059,456 ------------ ------------ 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 (D) $ 1,555,404 03/14/07 1,415,638 1,244,323 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 -- ------------ ------------ 1,624,528 1,244,323 ------------ ------------ L H D EUROPE HOLDINGS, INC. A non-carbonated beverage dispensing company focused on the foodservice industry. Common Stock (B) 45 shs. 12/28/09 4,191 12,825 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 16 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 $ 656,154 09/12/08 $ 608,288 $ 634,794 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 -- ------------ ------------ 675,145 634,794 ------------ ------------ 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. * 166,481 170,202 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 1,787 shs. 05/04/07 22,781 23,830 ------------ ------------ * 05/04/07 and 01/02/08. 672,334 710,209 ------------ ------------ MANHATTAN BEACHWEAR HOLDING COMPANY A designer and distributor of women's swimwear. 12.5% Senior Subordinated Note due 2018 $ 882,353 01/15/10 775,154 900,000 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 ------------ ------------ 987,380 1,011,769 ------------ ------------ MAVERICK ACQUISITION COMPANY A manufacturer of capsules that cover the cork and neck of wine bottles. 6.79% Senior Secured Tranche A Note due 2011 (C) $ 81,741 09/03/04 81,741 81,741 12.5% Senior Secured Tranche B Note due 2011 $ 179,104 09/03/04 174,338 179,104 6.79% Senior Secured Revolver due 2011 (C) $ 44,777 09/03/04 44,777 44,777 Limited Partnership Interest (B) 4.48% int. 09/03/04 33,582 11,979 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 243 shs. 09/03/04 22,556 8,655 ------------ ------------ 356,994 326,256 ------------ ------------ MBWS ULTIMATE HOLDCO, INC. A provider of services throughout North Dakota that address the fluid management and related transportation needs of an oil well. 12% Senior Subordinated Note due 2016 $ 883,721 09/07/10 789,623 880,053 Preferred Stock Series A (B) 1,388 shs. 09/07/10 138,797 131,860 Common Stock (B) 153 shs. 09/07/10 15,282 14,535 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 386 shs. 09/07/10 38,623 4 ------------ ------------ 982,325 1,026,452 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 17 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 $ 620,676 08/29/08 $ 557,062 $ 626,883 Preferred Unit (B) 66 uts. 08/29/08 66,451 75,897 Common Unit Class A (B) 671 uts. 08/29/08 671 -- Common Unit Class B (B) 250 uts. 08/29/08 63,564 -- ------------ ------------ 687,748 702,780 ------------ ------------ 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 1,129,821 Preferred Stock (B) 56 shs. 09/24/08 54,040 -- 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 1,129,821 ------------ ------------ 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 * 1,373,579 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. 1,697,860 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 1,184,076 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 -- ------------ ------------ 1,337,960 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 56,198 138,751 Warrant, exercisable until 2014, to purchase common stock at $.02 per share (B) 586 shs. 08/04/06 56,705 144,632 ------------ ------------ 112,903 283,383 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 18 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 $ 1,279,360 $ 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 -- ------------ ------------ 1,694,920 884,856 ------------ ------------ NABCO, INC. A producer of explosive containment vessels in the United States. 14% Senior Subordinated Note due 2014 (D) $ 330,882 02/24/06 304,577 -- 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 -- ------------ ------------ NAVIS GLOBAL A designer, manufacturer, seller and servicer of finishing machinery for the knit and woven segments of the global textile industry. 10.75% Senior Secured Note due 2011 (D) $ 397,479 05/28/04 393,979 377,605 14% Senior Subordinated Note due 2014 (D) $ 780,219 05/28/04 664,277 195,055 ------------ ------------ 1,058,256 572,660 ------------ ------------ 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 1,125,000 Common Stock (B) 225,000 shs. 08/02/07 225,000 352,945 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 63,191 shs. 08/02/07 102,842 99,124 ------------ ------------ 1,327,500 1,577,069 ------------ ------------ 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 02/02/07 745,713 567,000 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 -- Limited Liability Company Unit Class D-1 of Saw Mill PCG Partners LLC (B) 65 uts. 09/30/09 64,940 -- Preferred Stock Class A (B) 1 sh. 12/18/08 726 -- Preferred Stock Class A-1 (B) 6 shs. 09/30/09 5,635 -- Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 48 shs. 02/02/07 48,087 -- ------------ ------------ * 12/18/08 and 09/30/09. 1,413,238 567,000 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 19 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 $ 1,492,105 * $ 1,221,384 $ 1,528,342 Limited Partnership Interest (B) 1,724 uts. * 174,006 79,500 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 2,605 shs. * 260,479 119,007 ------------ ------------ * 07/09/09 and 08/09/10. 1,655,869 1,726,849 ------------ ------------ NYLONCRAFT, INC. A supplier of engineered plastic components for the automotive industry. 10% Senior Secured Note due 2012 $ 464,286 01/28/02 464,286 441,072 15% Senior Subordinated Note due 2012 (D) $ 285,714 01/28/02 270,653 271,428 Convertible Preferred Stock A (B) 571 shs. 01/28/02 549,507 254,740 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 -- ------------ ------------ 1,555,614 967,240 ------------ ------------ O E C HOLDING CORPORATION A provider of elevator maintenance, repair and modernization services. 13% Senior Subordinated Note due 2017 $ 444,445 06/04/10 405,339 453,630 Preferred Stock Series A (B) 554 shs. 06/04/10 55,354 52,586 Preferred Stock Series B (B) 311 shs. 06/04/10 31,125 3 Common Stock (B) 344 shs. 06/04/10 344 327 ------------ ------------ 492,162 506,546 ------------ ------------ OAKRIVER TECHNOLOGY, INC. Designs, engineers and assembles high precision automated process equipment for the medical device industry with a focus on defibrilators and stents. 10% Senior Secured Note due 2012 $ 45,982 01/03/06 45,292 45,982 13% Senior Subordinated Note due 2013 $ 392,709 01/03/06 366,606 392,709 Common Stock (B) 184,176 shs. 01/03/06 184,176 137,926 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 43,073 shs. 01/03/06 35,900 32,257 ------------ ------------ 631,974 608,874 ------------ ------------ 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 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 20 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 $ 359,364 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 328 shs. 01/17/06 90,424 60,674 ------------ ------------ 393,309 420,038 ------------ ------------ 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 $ 1,249,031 07/03/06 1,202,546 1,249,031 Preferred Unit (B) 202 uts. 07/03/06 202,320 316,890 Preferred Unit (B) 36 uts. 07/03/06 36,420 57,044 Common Unit Class I (B) 78 uts. 07/03/06 -- 723,902 Common Unit Class L (B) 17 uts. 07/03/06 -- 152,931 ------------ ------------ 1,441,286 2,499,798 ------------ ------------ 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 1,164,439 1,215,000 Preferred Stock (B) 19 shs. 03/31/06 174,492 245,885 Common Stock (B) 12 shs. 03/31/06 13,500 117,540 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 7 shs. 03/31/06 5,888 68,395 ------------ ------------ 1,358,319 1,646,820 ------------ ------------ 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 $ 719,041 04/27/07 683,387 668,962 5% Senior Subordinated Note due 2012 $ 42,187 07/21/10 42,187 42,352 Preferred Shares Series E (B) 42,187 shs. 07/21/10 -- -- Limited Liability Preferred Unit (B) 928,962 uts. 04/27/07 33,477 -- ------------ ------------ 759,051 711,314 ------------ ------------ 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 1,102,185 1,125,000 Membership Interests of MM/Lincap PPI Investments, Inc., LLC (B) 1.28% int. 12/21/00 140,625 139,772 ------------ ------------ 1,242,810 1,264,772 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 21 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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. 15% Senior Subordinated Note due 2013 $ 817,979 06/03/10 801,797 819,790 3% Senior Subordinated PIK Note due 2014 (D) $ 1,209,017 10/02/06 1,066,355 1,148,566 Limited Liability Company Unit Class A (B) 733 uts. 10/02/06 270,000 -- Limited Liability Company Unit (B) 76 uts. 05/22/09 340 -- Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 4,550 shs. 10/02/06 65,988 -- ------------ ------------ 2,204,480 1,968,356 ------------ ------------ 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 1,161,192 1,224,224 Limited Partnership Interest (B) 12.55% int. 02/11/08 94,092 10,310 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 700 shs. 02/11/08 88,723 20,320 ------------ ------------ 1,344,007 1,254,854 ------------ ------------ 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 $ 1,368,089 11/12/09 1,229,892 1,405,946 Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 109 shs. 11/12/09 107,970 1 ------------ ------------ 1,337,862 1,405,947 ------------ ------------ QUALIS AUTOMOTIVE LLC A distributor of aftermarket automotive brake and chassis products. 13% Senior Subordinated Note due 2013 $ 922,612 05/28/04 846,452 922,612 Common Stock (B) 187,500 shs. 05/28/04 187,500 256,480 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 199,969 shs. 05/28/04 199,969 273,537 ------------ ------------ 1,233,921 1,452,629 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 22 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ R A J 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 $ 1,384,011 12/15/06 $ 1,278,986 $ 1,314,811 Limited Liability Company Unit (B) 1,497 uts. 12/15/06 149,723 57,757 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 2 shs. 12/15/06 69,609 27,255 ------------ ------------ 1,498,318 1,399,823 ------------ ------------ 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 1,358,372 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 3 shs. 01/18/08 16,459 4,723 ------------ ------------ 1,323,000 1,363,095 ------------ ------------ ROYAL BATHS MANUFACTURING COMPANY A manufacturer and distributor of acrylic and cultured marble bathroom products. 12.5% Senior Subordinated Note due 2011 $ 562,500 11/14/03 549,493 561,522 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 74 shs. 11/14/03 65,089 81,481 ------------ ------------ 614,582 643,003 ------------ ------------ SAFETY SPEED CUT MANUFACTURING COMPANY, INC. A manufacturer of vertical panel saws and routers for the woodworking industry. Class B Common Stock (B) 846 shs. 06/02/99 146,456 164,253 ------------ ------------ SAVAGE SPORTS HOLDING, INC. A manufacturer of sporting firearms. 12% Senior Subordinated Note due 2012 $ 814,655 09/10/04 789,537 814,655 Preferred Stock Series A (B) 35,038 shs. 05/28/10 35,038 33,288 Common Stock (B) 324 shs. * 340,378 438,115 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 71 shs. 09/10/04 60,129 95,655 ------------ ------------ * 09/10/04 and 10/05/07. 1,225,082 1,381,713 ------------ ------------ 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 01/15/09 832,226 794,423 Common Stock (B) 69 shs. 01/15/09 69,231 -- Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 149 shs. 01/15/09 149,084 -- ------------ ------------ 1,050,541 794,423 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 23 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ SMART SOURCE HOLDINGS LLC A short-term computer rental company. 12% Senior Subordinated Note due 2015 $ 1,176,924 * $ 1,088,065 $ 1,161,640 Limited Liability Company Unit (B) 328 uts. * 334,371 220,664 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 83 shs. * 87,231 55,894 ------------ ------------ * 08/31/07 and 03/06/08. 1,509,667 1,438,198 ------------ ------------ SPARTAN FOODS HOLDING COMPANY A manufacturer of branded pizza crusts and pancakes. 12.25% Senior Subordinated Note due 2017 $ 1,012,500 12/15/09 878,669 1,022,077 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 136 shs. 12/15/09 120,234 1 ------------ ------------ 998,903 1,022,078 ------------ ------------ SPECIALTY COMMODITIES, INC. A distributor of specialty food ingredients. 13.25% Senior Subordinated Note due 2016 $ 1,220,311 10/23/08 1,150,470 1,244,717 Common Stock (B) 15,882 shs. 10/23/08 158,824 113,054 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 5,852 shs. 10/23/08 53,285 41,657 ------------ ------------ 1,362,579 1,399,428 ------------ ------------ 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 1,131,270 1,155,652 Common Stock (B) 165 shs. 08/01/06 164,634 52,397 Warrant, exercisable until 2014, to purchase common stock at $.02 per share (B) 55 shs. 08/01/06 49,390 17,451 ------------ ------------ 1,345,294 1,225,500 ------------ ------------ SUNDANCE INVESTCO LLC A provider of post-production services to producers of movies and television shows. Limited Liability Company Unit Class A (B) 3,405 shs. 03/31/10 -- -- ------------ ------------ SYNTERACT HOLDINGS CORPORATION A provider of outsourced clinical trial management services to pharmaceutical and biotechnology companies. 14.5% Senior Subordinated Note due 2016 $ 1,381,270 09/02/08 1,298,257 1,395,083 Redeemable Preferred Stock Series A (B) 678 shs. 09/02/08 6,629 144 Warrant, exercisable until 2018, to purchase common stock at $.01 per share (B) 6,778 shs. 09/02/08 59,661 -- ------------ ------------ 1,364,547 1,395,227 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 24 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ 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 ------------ ------------ 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 1,429,425 Common Stock (B) 143 shs. 09/02/09 5,823 -- Warrant, exercisable until 2019, to purchase common stock at $.01 per share (B) 4,187 shs. * 173,349 -- ------------ ------------ * 05/20/09 and 09/02/09. 1,653,867 1,429,425 ------------ ------------ 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 * 639,934 542,358 6.79% Term Note due 2012 (C) $ 779,834 * 777,110 730,217 8.75% Term Note due 2012 (C) $ 830 * 830 777 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. 1,536,857 1,273,352 ------------ ------------ 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. 14.5% Senior Subordinated Note due 2013 (D) $ 1,185,366 10/26/07 1,113,016 -- Series B Preferred Stock (B) 97 shs. 03/31/10 -- -- Common Stock (B) 273 shs. 03/31/10 219,203 -- ------------ ------------ 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 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 25 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ TRANSPAC HOLDING COMPANY A designer, importer, and wholesaler of home decor and seasonal gift products. 14% Senior Subordinated Note due 2015 (D) $ 938,651 10/31/07 $ 873,498 $ 891,718 Common Stock (B) 110 shs. 10/31/07 110,430 6,236 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 50 shs. 10/31/07 46,380 2,816 ------------ ------------ 1,030,308 900,770 ------------ ------------ TRANSTAR HOLDING COMPANY A distributor of aftermarket automotive transmission parts. 12% Senior Subordinated Note due 2014 $ 918,000 08/31/05 893,993 918,000 Common Stock (B) 571 shs. * 570,944 838,662 Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 46 shs. 08/31/05 41,021 66,836 ------------ ------------ * 08/31/05 and 04/30/07. 1,505,958 1,823,498 ------------ ------------ 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 1,340,791 1,356,000 Common Stock (B) 315 shs. 02/04/98 315,000 363,099 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 222 shs. 02/05/98 184,416 255,899 ------------ ------------ 1,840,207 1,974,998 ------------ ------------ 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. 8% Senior Subordinated Note due 2011 (D) $ 1,222,698 * 1,133,973 1,100,428 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 1,100,428 ------------ ------------ TRUSTILE DOORS, INC. A manufacturer and distributor of interior doors. Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 3,060 shs. 04/11/03 36,032 578 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 26 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ U M A ENTERPRISES, INC. An importer and wholesaler of home decor products. 15% Senior Subordinated Note due 2015 $ 952,932 02/08/08 $ 932,336 $ 952,338 Convertible Preferred Stock (B) 470 shs. 02/08/08 469,565 277,998 ------------ ------------ 1,401,901 1,230,336 ------------ ------------ 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 04/30/04 960,332 946,675 14.5% PIK Note due 2012 $ 221,640 10/06/09 196,646 210,558 Common Stock (B) 96 shs. 04/30/04 96,400 29,782 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 122 shs. 04/30/04 112,106 37,692 ------------ ------------ 1,365,484 1,224,707 ------------ ------------ VISIONEERING, INC. A designer and manufacturer of tooling and fixtures for the aerospace industry. 10.5% Senior Secured Term Loan due 2013 $ 458,824 05/17/07 451,942 455,356 13% Senior Subordinated Note due 2014 $ 370,588 05/17/07 340,367 366,123 18% PIK Convertible Preferred Stock (B) 21,361 shs. 03/13/09 41,440 -- 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 -- ------------ ------------ 935,797 821,479 ------------ ------------ VITEX PACKAGING GROUP, INC. A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags. 10% Senior Subordinated PIK Note due 2011 $ 89,626 10/29/09 83,079 85,145 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. 10/29/09 413,244 208,141 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. 1,399,366 720,786 ------------ ------------ WELLBORN FOREST HOLDING CO. A manufacturer of semi-custom kitchen and bath cabinetry. 14.13% Senior Subordinated Note due 2014 $ 911,250 11/30/06 858,237 865,688 Common Stock (B) 101 shs. 11/30/06 101,250 30,704 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 51 shs. 11/30/06 45,790 15,329 ------------ ------------ 1,005,277 911,721 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 27 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Principal Amount Shares, Units or Ownership Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Percentage Date Cost Fair Value ------------ -------- ------------ ------------ WHEATON HOLDING CORPORATION A distrtibutor and manufacturer of laboratory supply products and packaging. 13% Senior Subordinated Note due 2017 $ 1,000,000 06/08/10 $ 911,591 $ 1,016,848 Preferred Stock Series B (B) 703 shs. 06/08/10 70,308 7 Common Stock (B) 353 shs. 06/08/10 353 4 ------------ ------------ 982,252 1,016,859 ------------ ------------ WORKPLACE MEDIA HOLDING CO. A direct marketer specializing in providing advertisers with access to consumers in the workplace. 13% Senior Subordinated Note due 2015 (D) $ 613,692 05/14/07 569,649 429,584 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 -- ------------ ------------ 675,143 429,584 ------------ ------------ 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 1,203,288 983,793 Common Stock (B) 150 shs. 09/08/08 150,000 -- ------------ ------------ 1,353,288 983,793 ------------ ------------ TOTAL PRIVATE PLACEMENT INVESTMENTS (E) 115,205,680 103,182,218 ------------ ------------ -------------------------------------------------------------------------------------------------------------------------------- 28 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Shares or Interest Due Principal Market CORPORATE RESTRICTED SECURITIES:(A)(Continued) Rate Date Amount Cost Value ------- -------- ------------ ------------ ------------ RULE 144A SECURITIES - 2.90%: BONDS - 2.90% Appleton Papers, Inc. 11.250% 12/15/15 $ 252,000 $ 250,000 $ 189,000 ArcelorMittal 6.125 06/01/18 500,000 519,176 540,758 C C O Holdings LLC 7.250 10/30/17 350,000 350,000 354,813 Cenveo Corporation 10.500 08/15/16 45,000 45,000 46,012 Coffeyville Resources LLC 9.000 04/01/15 70,000 69,658 73,850 CompuCom Systems, Inc. 12.500 10/01/15 670,000 653,060 718,575 G F S I, Inc. (C) 10.500 06/01/11 358,000 343,948 358,000 Gannett Company, Inc. 9.375 11/15/17 60,000 59,149 65,700 International Lease Finance Corporation 8.625 09/15/15 75,000 73,895 80,250 Lyondell Chemical Co. 8.000 11/01/17 100,000 100,000 109,125 Magnachip Semiconductor 10.500 04/15/18 95,000 95,245 98,562 NBC Universal 5.150 04/30/20 500,000 499,295 536,407 Sinclair Television Group, Inc. 9.250 11/01/17 200,000 194,970 214,500 ViaSystems, Inc. 12.000 01/15/15 100,000 96,793 110,000 ------------ ------------ TOTAL BONDS 3,350,189 3,495,552 ------------ ------------ 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% Nortek, Inc. (B) 100 1 3,905 Touchstone Health Partnership (B) 292 1,062 -- ------------ ------------ TOTAL COMMON STOCK 1,063 3,905 ------------ ------------ TOTAL RULE 144A SECURITIES 3,352,463 3,499,457 ------------ ------------ TOTAL CORPORATE RESTRICTED SECURITIES $118,558,143 $106,681,675 ------------ ------------ ---------------------------------------------------------------------------------------------------------------- 29 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Interest Due Principal Market CORPORATE PUBLIC SECURITIES - 15.81%: (A) Rate Date Amount Cost Value ------- -------- ------------ ------------ ------------ BONDS - 15.35% ACCO Brands Corporation 10.625% 03/15/15 $ 45,000 $ 44,430 $ 50,288 Affinia Group, Inc. 9.000 11/30/14 25,000 24,250 25,750 Allegheny Technologies, Inc. 9.375 06/12/19 500,000 520,626 604,286 Allied Waste NA 7.125 05/15/16 500,000 506,196 535,625 American General Finance Corporation 6.500 09/15/17 250,000 215,000 197,500 C R H America, Inc. 5.300 10/15/13 500,000 418,430 536,692 Centurytel, Inc. 5.000 02/15/15 500,000 514,817 518,649 Citigroup, Inc. 5.500 04/11/13 500,000 437,890 536,422 Cytec Industries, Inc. 8.250 11/15/19 600,000 603,676 754,972 Diversey, Inc. 8.950 07/01/17 45,000 44,627 48,150 Equifax, Inc. 4.450 12/01/14 500,000 516,460 532,611 Exide Corporation 10.500 03/15/13 250,000 252,240 255,625 GATX Corporation 4.750 05/15/15 500,000 512,612 531,693 Gencorp, Inc. 9.500 08/15/13 130,000 130,000 132,275 General Electric Capital Corporation 5.500 01/08/20 500,000 498,050 546,954 Goldman Sachs Group, Inc. 4.750 07/15/13 500,000 418,645 536,822 Goodyear Tire & Rubber Co. 10.500 05/15/16 50,000 48,219 56,625 Headwaters, Inc. 11.375 11/01/14 45,000 44,580 47,925 Intelsat Burmuda Ltd. 9.250 06/15/16 690,000 713,577 733,125 International Game Technology 7.500 06/15/19 500,000 499,720 594,210 International Lease Finance Corporation 5.875 05/01/13 500,000 448,188 500,000 Iron Mountain, Inc. 8.750 07/15/18 500,000 512,068 530,625 J.C. Penney Company, Inc. 7.950 04/01/17 500,000 554,735 561,250 Johnson Controls, Inc. 5.500 01/15/16 500,000 398,125 566,589 Kraft Foods, Inc. 5.375 02/10/20 500,000 516,707 556,576 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 35,394 Masco Corporation 7.125 03/15/20 350,000 349,993 357,397 Morgan Stanley 5.500 01/26/20 500,000 497,305 513,925 Nortek, Inc. 11.000 12/01/13 100,444 98,956 106,722 Owens Corning, Inc. 9.000 06/15/19 30,000 29,516 35,625 Pride International, Inc. 6.875 08/15/20 30,000 30,000 32,475 Qwest Diagnostic, Inc. 4.750 01/30/20 500,000 498,665 524,265 Rental Service Corporation 9.500 12/01/14 175,000 175,617 181,343 Sealed Air Corporation 7.875 06/15/17 500,000 492,897 541,690 Sheridan Acquisition Corporation 10.250 08/15/11 225,000 222,001 223,031 Sprint Capital Corporation 6.900 05/01/19 440,000 405,225 442,200 Teck Resources Ltd. 10.750 05/15/19 30,000 28,605 37,779 ---------------------------------------------------------------------------------------------------------------- 30 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Shares or Interest Due Principal Market CORPORATE PUBLIC SECURITIES:(A)(Continued) Rate Date Amount Cost Value ------- -------- ------------ ------------ ------------ The Valspar Corporation 7.250% 06/15/19 $ 500,000 $ 501,383 $ 610,202 Ticketmaster Entertainment, Inc. 10.750 07/28/16 250,000 250,000 273,750 Time Warner Cable, Inc. 5.000 02/01/20 500,000 489,790 535,463 Titan International, Inc. 8.000 01/15/12 70,000 70,000 75,250 Tube City IMS Corporation 9.750 02/01/15 1,000,000 988,790 1,020,000 Tyco International Group SA 8.500 01/15/19 500,000 457,495 584,802 Tyco International Group SA 6.550 10/01/17 125,000 124,996 166,202 United Components, Inc. 9.375 06/15/13 535,000 535,085 544,364 Verso Paper Holdings LLC 9.125 08/01/14 500,000 486,875 501,250 W P P Finance Corporation 5.875 06/15/14 500,000 507,224 554,010 ------------ ------------ TOTAL BONDS 16,762,075 18,488,128 ------------ ------------ COMMON STOCK - 0.46% CKX, Inc. (B) 52,500 422,625 257,250 Directed Electronics, Inc. (B) 195,118 982,867 146,339 Intrepid Potash, Inc. (B) 185 5,920 4,823 ITC^DeltaCom, Inc. (B) 94,588 827,645 130,531 Rue21, Inc. (B) 350 6,650 9,034 ------------ ------------ TOTAL COMMON STOCK 2,245,707 547,977 ------------ ------------ TOTAL CORPORATE PUBLIC SECURITIES $ 19,007,782 $ 19,036,105 ------------ ------------ TOTAL INVESTMENTS 104.37% $137,565,925 $125,717,780 ============ ------------ Other Assets 6.44 7,762,852 Liabilities (10.81) (13,020,585) ------ ------------ TOTAL NET ASSETS 100.00% $120,460,047 ====== ============ (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 09/30/10. (D) Defaulted security; interest not accrued. (E) Illiquid security. As of September 30, 2010, the value of these securities amounted to $103,182,218 or 85.66% of net assets. PIK - Payment-in-kind ---------------------------------------------------------------------------------------------------------------- 31 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value -------------- -------------- AEROSPACE - 4.40% BUILDINGS & REAL ESTATE - 1.36% A E Company, Inc. $ 1,846,976 K W P I Holdings Corporation $ 1,244,323 Gencorp, Inc. 132,275 Masco Corporation 357,397 P A S Holdco LLC 2,499,798 Owens Corning, Inc. 35,625 Visioneering, Inc. 821,479 TruStile Doors, Inc. 578 -------------- -------------- 5,300,528 1,637,923 -------------- -------------- AUTOMOBILE - 5.14% CHEMICAL, PLASTICS & RUBBER - 0.49% Exide Corporation 255,625 Capital Specialty Plastics, Inc. 587,055 Goodyear Tire & Rubber Co. 56,625 -------------- Jason, Inc. 25,509 Johnson Controls, Inc. 566,589 CONSUMER PRODUCTS - 9.88% Nyloncraft, Inc. 967,240 Aero Holdings, Inc. 1,971,104 Ontario Drive & Gear Ltd. 420,038 Bravo Sports Holding Corporation 1,322,001 Qualis Automotive LLC 1,452,629 Custom Engineered Wheels, Inc. 1,374,923 Titan International, Inc. 75,250 G F S I, Inc. 358,000 Transtar Holding Company 1,823,498 Johnson Diversey, Inc. 48,150 United Components, Inc. 544,364 K N B Holdings Corporation 1,515,304 -------------- Manhattan Beachwear Holding Company 1,011,769 6,187,367 Momentum Holding Co. 283,383 -------------- R A J Manufacturing Holdings LLC 1,399,823 BEVERAGE, DRUG & FOOD - 6.09% Royal Baths Manufacturing Company 643,003 Eatem Holding Company 1,023,022 The Tranzonic Companies 1,974,998 F F C Holding Corporation 990,096 -------------- Golden County Foods Holding, Inc. 1,207,177 11,902,458 Hospitality Mints Holding Company 1,119,209 -------------- Kraft Foods, Inc. 556,576 CONTAINERS, PACKAGING & GLASS - 3.95% L H D Europe Holding, Inc. 12,825 Flutes, Inc. 262,396 Spartan Foods Holding Company 1,022,078 Maverick Acquisition Company 326,256 Specialty Commodities, Inc. 1,399,428 P I I Holding Corporation 1,646,820 -------------- Paradigm Packaging, Inc. 1,264,772 7,330,411 Sealed Air Corporation 541,690 -------------- Vitex Packaging Group, Inc. 720,786 BROADCASTING & ENTERTAINMENT - 2.39% -------------- C C O Holdings LLC 354,813 4,762,720 CKX, Inc. 257,250 -------------- NBC Universal 536,407 DISTRIBUTION - 1.81% Sinclair Television Group, Inc. 214,500 Duncan Systems, Inc. 842,962 Time Warner Cable, Inc. 535,463 F C X Holdings Corporation 1,337,944 WPP Finance Corporation 554,010 -------------- Workplace Media Holding Co. 429,584 2,180,906 -------------- -------------- 2,882,027 -------------- ------------------------------------------------------------------------------------------------------------------------------------ 32 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value -------------- -------------- DIVERSIFIED/CONGLOMERATE, ELECTRONICS - 1.09% MANUFACTURING - 9.33% Barcodes Group, Inc. $ 779,360 A H C Holdings Company, Inc. $ 1,567,332 Connecticut Electric, Inc. 385,526 Arrow Tru-Line Holdings, Inc. 853,187 Directed Electronics, Inc. 146,339 C D N T, Inc. 784,045 -------------- Headwaters, Inc. 47,925 1,311,225 K P I Holdings, Inc. 1,059,456 -------------- MEGTEC Holdings, Inc. 1,129,821 FINANCIAL SERVICES - 2.86% Milwaukee Gear Company 1,121,539 American General Finance Corporation 197,500 Nortek, Inc. 110,627 Citigroup, Inc. 536,422 O E C Holding Corporation 506,546 GATX Corporation 531,693 Postle Aluminum Company LLC 1,968,356 General Electric Capital Corporation 546,954 Truck Bodies & Equipment International 1,100,428 Goldman Sachs Group, Inc. 536,822 Xaloy Superior Holdings, Inc. 983,793 Highgate Capital LLC -- -------------- International Lease Finance Corporation 580,250 11,233,055 Morgan Stanley 513,925 -------------- -------------- DIVERSIFIED/CONGLOMERATE, SERVICE - 12.94% 3,443,566 A S C Group, Inc. 1,380,701 -------------- A W X Holdings Corporation 315,000 HEALTHCARE, EDUCATION & CHILDCARE - 4.22% ACCO Brands Corporation 50,288 American Hospice Management Holding LLC 2,152,153 Advanced Technologies Holdings 1,456,151 F H S Holdings LLC -- Affinia Group, Inc. 25,750 Qwest Diagnostic, Inc. 524,265 Apex Analytix Holding Corporation 1,401,005 Synteract Holdings Corporation 1,395,227 Associated Diversified Services 694,419 Touchstone Health Partnership -- C R H America, Inc. 536,692 Wheaton Holdings Corporation 1,016,859 Clough, Harbour and Associates 1,441,508 -------------- Crane Rental Corporation 1,212,223 5,088,504 Diversco, Inc./DHI Holdings, Inc. 236,518 -------------- Dwyer Group, Inc. 830,058 HOME & OFFICE FURNISHINGS, HOUSEWARES, Equifax, Inc. 532,611 & DURABLE CONSUMER PRODUCTS - 8.62% Insurance Claims Management, Inc. 181,594 Connor Sport Court International, Inc. 1,384,051 Iron Mountain, Inc. 530,625 H M Holding Company 272,025 Mail Communications Group, Inc. 710,209 Home Decor Holding Company 1,302,169 Nesco Holdings Corporation 1,577,069 Justrite Manufacturing Acquisition Co. 955,159 Northwest Mailing Services, Inc. 1,726,849 K H O F Holdings, Inc. 99,511 Pearlman Enterprises, Inc. -- Monessen Holding Corporation 884,856 Tyco International Group 751,004 Stanton Carpet Holding Co. 1,225,500 -------------- Transpac Holdings Company 900,770 15,590,274 U M A Enterprises, Inc. 1,230,336 -------------- U-Line Corporation 1,224,707 Wellborn Forest Holding Co. 911,721 -------------- 10,390,805 -------------- ------------------------------------------------------------------------------------------------------------------------------------ 33 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value -------------- -------------- LEISURE, AMUSEMENT, ENTERTAINMENT - 1.86% NATURAL RESOURCES - 2.29% International Game Technology $ 594,210 Appleton Papers, Inc. $ 189,000 Savage Sports Holding, Inc. 1,381,713 ArcelorMittal 540,758 Ticketmaster Entertainment, Inc. 273,750 Cenveo Corporation 46,012 -------------- Cytec Industries, Inc. 754,972 2,249,673 Intrepid Potash, Inc. 4,823 -------------- Lyondell Chemical Co. 109,125 MACHINERY - 7.26% The Valspar Corporation 610,202 A S A P Industries LLC 677,667 Verso Paper Holdings LLC 501,250 Davis-Standard LLC 1,418,726 -------------- E S P Holdco, Inc. 1,284,220 2,756,142 M V I Holding, Inc. 634,794 -------------- Manitowoc Company, Inc. 99,750 OIL & GAS - 2.60% Navis Global 572,660 Coffeyville Resources LLC 73,850 NetShape Technologies, Inc. 567,000 International Offshore Services LLC 1,360,394 Pacific Consolidated Holdings LLC 711,314 MBWS Ultimate Holdco, Inc. 1,026,452 Power Services Holding Company 1,254,854 Pride International, Inc. 32,475 R E I Delaware Holding, Inc. 1,363,095 Total E & S, Inc. 633,149 Safety Speed Cut Manufacturing Company, Inc. 164,253 -------------- -------------- 3,126,320 8,748,333 -------------- -------------- PHARMACEUTICALS - 1.23% MEDICAL DEVICES/BIOTECH - 3.88% CorePharma LLC 1,477,518 Coeur, Inc. 707,298 -------------- E X C Acquisition Corporation 40,585 PUBLISHING/PRINTING - 0.24% ETEX Corporation -- Gannett Company, Inc. 65,700 MedSystems Holdings LLC 702,780 Sheridan Acquisition Corporation 223,031 MicroGroup, Inc. 1,208,526 -------------- OakRiver Technology, Inc. 608,874 288,731 Precision Wire Holding Company 1,405,947 -------------- TherOX, Inc. -- RETAIL STORES - 0.72% -------------- J. C. Penney Company, Inc. 561,250 4,674,010 Olympic Sales, Inc. 113,273 -------------- Rental Service Corporation 181,343 MINING, STEEL, IRON & NON-PRECIOUS Rue21, Inc. 9,034 METALS - 2.28% -------------- Allegheny Technology, Inc. 604,286 864,900 T H I Acquisition, Inc. 1,080,000 -------------- Teck Resources, Ltd. 37,779 TECHNOLOGY - 2.62% Tube City IMS Corporation 1,020,000 Compucom Systems, Inc. 718,575 -------------- Magnachip Semiconductor 98,562 2,742,065 Sencore Holding Company 794,423 -------------- Smart Source Holdings LLC 1,438,198 ViaSystems, Inc. 110,000 -------------- 3,159,758 -------------- ------------------------------------------------------------------------------------------------------------------------------------ 34 MassMutual Participation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED) September 30, 2010 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value -------------- -------------- TELECOMMUNICATIONS - 3.29% All Current Holding Company $ 703,205 Centurytel, Inc. 518,649 Intelsat Bermuda Ltd. 733,125 ITC^DeltaCom, Inc. 130,531 Spirit Capital Corporation 442,200 Sundance Investco LLC -- Telecorps Holdings, Inc. 1,429,425 -------------- 3,957,135 -------------- TRANSPORTATION - 0.0% NABCO, Inc. -- -------------- UTILITIES - .03% Markwest Energy Operating Co. 35,394 -------------- WASTE MANAGEMENT / POLLUTION - 1.50% Allied Waste NA 535,625 Terra Renewal LLC 1,273,352 Torrent Group Holdings, Inc. -- 1,808,977 -------------- TOTAL INVESTMENTS - 104.37% $ 125,717,780 ============== See Notes to Consolidated Financial Statements ------------------------------------------------------------------------------------------------------------------------------------ 35 INCOME TAX INFORMATION The aggregate cost of investments is substantially the same for financial reporting and Federal income tax purposes as of September 30, 2010. The net unrealized depreciation of investments for financial reporting and Federal tax purposes as of September 30, 2010 is $11,848,145 and consists of $12,106,802 appreciation and $23,954,947 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 September 30, 2010: ASSETS TOTAL LEVEL 1 LEVEL 2 LEVEL 3 ------------------------------------------------------------------------------- Restricted Securities Corporate Bonds $ 90,563,786 $ -- $ 3,495,552 $ 87,068,234 Common Stock - U.S. 8,377,394 -- 3,905 8,373,489 Preferred Stock 3,546,788 -- -- 3,546,788 Partnerships and LLCs 4,193,707 -- -- 4,193,707 Public Securities Corporate Bonds 18,488,128 -- 18,488,128 -- Common Stock - U.S. 547,977 547,977 -- -- Preferred Stock -- -- -- -- Short-term Securities -- -- -- -- ------------------------------------------------------------------------------- Total $125,717,780 $ 547,977 $ 21,987,585 $103,182,218 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 09/30/2010 still held --------------------------------------------------------------------------------------------------------------------------------- Restricted Securities Corporate Bonds $81,465,949 $ 3,337,086 $ 2,265,199 $ -- $ 87,068,234 $ 2,187,864 Common Stock - U.S. 7,767,378 1,138,392 (532,281) 8,373,489 1,329,343 Preferred Stock 3,468,130 1,319,134 (1,240,476) 3,546,788 156,498 Partnerships and LLCs 3,536,247 1,472,509 (815,049) 4,193,707 924,338 --------------------------------------------------------------------------------------------------------------------------------- $96,237,704 $ 7,267,121 $ (322,607) $ -- $103,182,218 $ 4,598,043 --------------------------------------------------------------------------------------------------------------------------------- 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 November 29, 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 November 29, 2010 ------------------------------------------------------------------ By (Signature and Title)* /s/ James M. Roy --------------------------------------------- James M. Roy, Vice President and Chief Financial Officer Date November 29, 2010 ------------------------------------------------------------------ * PRINT THE NAME AND TITLE OF EACH SIGNING OFFICER UNDER HIS OR HER SIGNATURE.