UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-5531 --------------------------------------------- MassMutual Participation Investors -------------------------------------------------------------------------------- (Exact name of registrant as specified in charter) 1500 Main Street, Suite 600, Springfield, MA 01115-5189 -------------------------------------------------------------------------------- (Address of principal executive offices) (Zip code) Rodney J. Dillman, Vice President and Secretary 1500 Main Street, Suite 2800, Springfield, MA 01115-5189 -------------------------------------------------------------------------------- (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: 6/30/07 ------------------ Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection and policymaking roles. A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. REPORT TO STOCKHOLDERS. Attached hereto is the semi-annual shareholder report transmitted to shareholders pursuant to Rule 30e-1 of the Investment Company Act of 1940, as amended. MASSMUTUAL PARTICIPATION INVESTORS Report fot the Six Months Ended June 30, 2007 [LOGO] ADVISER Babson Capital Management LLC 1500 Main Street, PO Box 15189 Springfield, Massachusetts 01115-5189 INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM KPMG LLP Boston, Massachusetts 02110 COUNSEL TO THE TRUST Ropes & Gray LLP Boston, Massachusetts 02110 CUSTODIAN Citibank, N.A. New York, New York 10043 TRANSFER AGENT & REGISTRAR Shareholder Financial Services, Inc. P.O. Box 173673 Denver, Colorado 80217-3673 1-800-647-7374 INTERNET WEBSITE www.babsoncapital.com/mpi [LOGO] MassMutual Participation Investors c/o Babson Capital Management LLC 1500 Main Street, PO Box 15189 Springfield, Massachusetts 01115-5189 (413) 226-1516 -------------------------------------------------------------------------------- INVESTMENT OBJECTIVE AND POLICY MassMutual Participation Investors (the "Trust") is a closed-end management investment company, first offered to the public in 1988, whose shares are traded on the New York Stock Exchange under the trading symbol "MPV" The Trust's share price can be found in the financial section of most newspapers as "MassPrt" or "MassMuPrt" under the New York Stock Exchange listings. The Trust's investment objective is to maximize total return by providing a high level of current income, the potential for growth of income, and capital appreciation. The Trust's principal investments are privately placed, below-investment grade, long-term corporate debt obligations purchased directly from their issuers, in private placement transactions. These investments are typically mezzanine debt investments with accompanying private equity securities made to small or middle market companies. At least half of these investments normally include equity features such as common stocks, warrants, conversion rights, or other equity features that provide the Trust with the opportunity to realize capital gains. The Trust will also invest in publicly traded debt securities (including high yield securities), again with an emphasis on those with equity features, and in convertible preferred stocks and, subject to certain limitations, readily marketable equity securities. In addition, the Trust may temporarily invest in high quality, readily marketable securities. Babson Capital Management LLC ("Babson Capital") manages the Trust on a total return basis. The Trust distributes substantially all of its net taxable income to shareholders each year. Accordingly, the Trust pays dividends to shareholders quarterly in January, May, August, and November. All registered shareholders are automatically enrolled in the Dividend Reinvestment and Cash Purchase Plan unless cash distributions are requested. FORM N-Q The Trust files its complete schedule of portfolio holdings with the U.S. Securities and Exchange Commission ("SEC") for the first and third quarters of each fiscal year on Form N-Q. This information is available (i) on the SEC's website at http://www.sec.gov; and (ii) at the SEC's Public Reference Room in Washington, DC (which information on their operation may be obtained by calling 1-800-SEC-0330). A complete schedule of portfolio holdings as of each quarter-end is available upon request by calling, toll-free, 866-399-1516. PROXY VOTING POLICIES & PROCEDURES; PROXY VOTING RECORD The Trustees of the Trust have delegated proxy voting responsibilities relating to the voting of securities held by the Trust to Babson Capital. A description of Babson Capital's proxy voting policies and procedures is available (1) without charge, upon request, by calling, toll-free 866-399-1516; (2) on the Trust's website: http:// www.babsoncapital.com/mpv; and (3) on the SEC's website: http://www.sec.gov. Information regarding how the Trust voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is available (1) on the Trust's website: http://www.babsoncapital.com/mpv and (2) on the SEC's website: http://www.sec.gov. MPV Listed NYSE TO OUR SHAREHOLDERS July 31, 2007 We are pleased to present the June 30, 2007 Semi-Annual Report of MassMutual Participation Investors (the "Trust"). The Board of Trustees declared a quarterly dividend of 25 cents per share, payable on August 10, 2007 to shareholders of record on July 27, 2007. The Trust had previously paid a 25 cent per share dividend for the preceding quarter. U.S. equity markets, as measured by several broad market indices, posted robust returns for the quarter ended June 30, 2007. Large stocks, as approximated by the Dow Jones Industrial Average, increased 9.11%. Smaller stocks, as approximated by the Russell 2000 Index, increased 4.41%. For the six months ended June 30, 2007, returns were 8.75% and 6.45% for the Dow Jones Industrial Average and Russell 2000 Index, respectively. U.S. fixed income markets, as measured by several broad market indices posted weak results during the quarter. The Lehman Brothers Government/Credit Index decreased 0.49% for the quarter while the Lehman Brothers U.S. Corporate High Yield Index increased 0.22% for the quarter ended June 30, 2007. For the six months ended June 30, 2007, returns were 0.97% and 2.87% for the Lehman Brothers Government/Credit Index and the Lehman Brothers U.S. Corporate High Yield Index, respectively. The mezzanine and private equity markets in which the Trust invests continue to be competitive. Valuations and leverage levels have been at or near their highest levels since the late 1980's. Merger and acquisition activity has been very robust and fundraising efforts in the private equity fund space continue to break records. All of this adds up to a challenging market for providers of mezzanine and private equity capital, such as the Trust. We have been through these cycles before and we believe that it is particularly important to continue to employ the same disciplined investment strategy that has served us well over the years. During the quarter ended June 30, 2007, the Trust made private placement investments in five new issuers and two "follow-on" investments, totaling approximately $4.1 million. The follow-on investments purchased by the Trust were Transtar Holding Company and NABCO, Inc. The five new issuers were Electra Bicycle Company, Inc., Mail Communications Group, Inc., Pacific Consolidated Holdings LLC, Visioneering, Inc. and Workplace Media Holding Co. The weighted average coupon of these investments was 11.91%. (A brief description of these investments can be found in the Consolidated Schedule of Investments.) During the quarter ended June 30, 2007, net assets of the Trust increased to $130,184,597 or $13.22 per share compared to $130,015,397 or $13.22 per share on March 31, 2007, which translates into a 1.90% total return for the quarter, based on the change in the Trust's net assets assuming the reinvestment of all dividends. Long term, the Trust returned 11.71%, 18.11% and 13.53% for the 1-, 5- and 10-year time periods ended June 30, 2007, respectively, based on the change in the Trust's net assets assuming the reinvestment of all dividends. The Trust earned 32 cents per share of net investment income for the quarter, of which 5 cents per share was from nonrecurring items, compared to 25 cents per share in the previous quarter. During the quarter ended June 30, 2007, the market price of the trust declined 9.0% from $16.21 per share to $14.75 per share, which translates into a -7.51% total return for the quarter, based on the change in the Trust's market value assuming reinvestment of all dividends. Long term, the Trust returned 10.83%, 18.03% and 15.89% for the 1-, 5- and 10-year time periods ended June 30, 2007, respectively, based on a change in the Trust's market value assuming the reinvestment of all dividends. The Trust's market price of $14.75 per share equates to an 11.6% premium over the June 30, 2007 NAV per share. The Trust's average quarter-end premium for the 1-, 5- and 10-year periods ended June 30, 2007 was 15.4%, 11.8% and 6.1%, respectively. Thank you for your continued interest in and support of MassMutual Participation Investors. Sincerely, Clifford M. Noreen President Portfolio Composition as of 06/30/07* *Based on market value of total investments Public Equity 0.7% Public High Yield Debt 20.3% Private Investment Grade Debt 4.7% Private/Restricted Equity 17.7% Cash & Short Term Investments 4.3% Private High Yield Debt 52.3% -------------------------------------------------------------------------------- 1 CONSOLIDATED STATEMENT OF MASSMUTUAL PARTICIPATION INVESTORS ASSETS AND LIABILITIES June 30, 2007 (Unaudited) Assets: Investments (See Consolidated Schedule of Investments) Corporate restricted securities at fair value (Cost - $104,411,324) $ 103,962,869 Corporate public securities at market value (Cost -$28,867,523) 29,174,130 Short-term securities at amortized cost 5,522,320 -------------- Cash 503,910 Interest receivable 3,036,902 Receivable for investments sold 1,260,355 Other assets 12,598 -------------- TOTAL ASSETS $ 143,473,084 -------------- Liabilities: Payable for investments purchased $ 466,874 Investment advisory fee payable 292,915 Note payable 12,000,000 Interest payable 96,495 Accrued expenses 104,249 Accounts payable 24,243 Accrued taxes payable 303,711 -------------- TOTAL LIABILITIES 13,288,487 -------------- TOTAL NET ASSETS $ 130,184,597 ============== NET ASSETS: Common shares, par value $.01 per share; an unlimited number authorized $ 98,458 Additional paid-in capital 91,558,536 Retained net realized gain on investments, prior years 32,187,872 Undistributed net investment income 4,121,460 Accumulated net realized gain on investments 2,545,072 Net unrealized depreciation of investments (326,801) -------------- TOTAL NET ASSETS $ 130,184,597 ============== COMMON SHARES ISSUED AND OUTSTANDING 9,845,812 ============== NET ASSET VALUE PER SHARE $ 13.22 ============== SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ------------------------------------------------------------------------------------------- 2 CONSOLIDATED STATEMENT OF OPERATIONS MASSMUTUAL PARTICIPATION INVESTORS For the six months ended June 30, 2007 (Unaudited) Investment Income: Interest $ 6,275,849 Dividends 449,725 Other 29,343 -------------- TOTAL INVESTMENT INCOME 6,754,917 -------------- Expenses: Investment advisory fees 585,450 Interest 364,914 Professional fees 64,800 Trustees' fees and expenses 60,000 Reports to shareholders 45,000 Transfer agent/registrar's expenses 8,000 Other 76,018 -------------- TOTAL EXPENSES 1,204,182 -------------- INVESTMENT INCOME - net 5,550,735 -------------- Net realized and unrealized gain (loss) on investments: Net realized gain on investments before taxes 2,500,552 Income tax expense (62,851) Net realized gain on investments 2,437,701 -------------- Net change in unrealized appreciation of investments before taxes (2,672,135) Net change in deferred income tax expense 199,273 -------------- Net change in unrealized appreciation of investments (2,472,862) NET LOSS ON INVESTMENTS (35,161) -------------- NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS $ 5,515,574 ============== SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ------------------------------------------------------------------------------------------- 3 CONSOLIDATED STATEMENT OF CASH FLOWS MASSMUTUAL PARTICIPATION INVESTORS For the six months ended June 30, 2007 (Unaudited) NET DECREASE IN CASH: Cash flows from operating activities: Interest, dividends, and other received $ 6,358,124 Interest expense paid (357,352) Operating expenses paid (832,657) Income taxes paid (3,519,168) -------------- NET CASH PROVIDED BY OPERATING ACTIVITIES 1,648,947 -------------- Cash flows from investing activities: Purchases/Proceeds/Maturities from short-term portfolio securities, net 1,482,462 Purchases of portfolio securities (16,585,826) Proceeds from disposition of portfolio securities 17,769,069 -------------- NET CASH PROVIDED BY INVESTING ACTIVITIES 2,665,705 -------------- NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES 4,314,652 -------------- Cash flows from financing activities: Cash dividends paid from net investment income (6,969,848) Cash dividends paid from net realized gain on investments (96,562) Receipts for shares issued on reinvestment of dividends 611,933 -------------- NET CASH USED FOR FINANCING ACTIVITIES (6,454,477) -------------- NET DECREASE IN CASH (2,139,825) Cash - beginning of year 2,643,735 -------------- CASH - END OF PERIOD $ 503,910 ============== RECONCILIATION OF NET INCREASE IN NET ASSETS TO NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES: NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS $ 5,515,574 -------------- Decrease in investments 3,038,758 Increase in interest receivable (36,076) Increase in receivable for investments sold (1,003,863) Increase in other assets (12,598) Increase in payable for investments purchased 466,874 Increase in investment advisory fee payable 8,256 Increase in interest payable 7,562 Decrease in accrued expenses (38,488) Increase in accounts payable 24,243 Decrease in accrued taxes payable (3,655,590) -------------- Total adjustments to net assets from operations (1,200,922) -------------- Net cash provided by operating and investing activities $ 4,314,652 ============== SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ------------------------------------------------------------------------------------------- 4 CONSOLIDATED STATEMENTS OF MASSMUTUAL PARTICIPATION INVESTORS CHANGES IN NET ASSETS For the six months ended For the 06/30/2007 year ended (Unaudited) 12/31/2006 -------------- -------------- INCREASE IN NET ASSETS: OPERATIONS: Investment income - net $ 5,550,735 $ 10,728,662 Net realized gain on investments 2,437,701 6,733,116 Net change in unrealized appreciation of investments (2,472,862) 814,564 -------------- -------------- Net increase in net assets resulting from operations 5,515,574 18,276,342 Increase from common shares issued on reinvestment of dividends Common shares issued (2007 - 40,530; 2006 - 61,052) 611,933 867,979 Dividends to shareholders from: Net investment income (2007 - $0.25 per share; 2006 - $1.18 per share) (2,457,923) (11,551,712) Net realized gains on investments (2006 - $0.01 per share) -- (96,562) -------------- -------------- TOTAL INCREASE IN NET ASSETS 3,669,584 7,496,047 NET ASSETS, BEGINNING OF YEAR 126,515,013 119,018,966 -------------- -------------- NET ASSETS, END OF PERIOD (including undistributed net investment income of $4,121,460 and $1,028,648, respectively) $ 130,184,597 $ 126,515,013 ============== ============== SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. --------------------------------------------------------------------------------------------------------------- 5 CONSOLIDATED SELECTED FINANCIAL HIGHLIGHTS MASSMUTUAL PARTICIPATION INVESTORS Selected data for each share of beneficial interest outstanding: For the six months ended For the years ended December 31, 06/30/2007 -------------------------------------------------------------------------- (Unaudited) 2006 2005 2004 2003 2002 ---------- ---------- ---------- ---------- ---------- ---------- Net asset value: Beginning of year $ 12.90 $ 12.21 $ 11.13 $ 9.84 $ 8.78 $ 9.12 ---------- ---------- ---------- ---------- ---------- ---------- Net investment income (a) 0.57 1.10 0.99 1.00 0.80 0.87 Net realized and unrealized gain (loss) on investments (0.00)(b) 0.77 1.09(c) 1.36 1.21 (0.35) ---------- ---------- ---------- ---------- ---------- ---------- Total from investment operations 0.57 1.87 2.08 2.36 2.01 0.52 ---------- ---------- ---------- ---------- ---------- ---------- Dividends from net investment income to common shareholders (0.25) (1.18) (1.01) (1.10) (0.96) (0.86) Dividends from net realized gain on investments to common shareholders -- (0.01) -- -- -- -- Increase from dividends reinvested -- 0.01 0.01 0.03 0.01 -- ---------- ---------- ---------- ---------- ---------- ---------- Total dividends (0.25) (1.18) (1.00) (1.07) (0.95) (0.86) ---------- ---------- ---------- ---------- ---------- ---------- Net asset value: End of period/year $ 13.22 $ 12.90 $ 12.21 $ 11.13 $ 9.84 $ 8.78 ---------- ---------- ---------- ---------- ---------- ---------- Per share market value: End of period/year $ 14.75 $ 14.70 $ 14.05 $ 13.31 $ 11.65 $ 9.40 ========== ========== ========== ========== ========== ========== Total investment return Market value 1.99% 16.81% 17.25% 25.77% 35.50% 12.58% Net asset value (d) 4.43% 18.64% 22.51% 25.14% 23.72% 5.70% Net assets (in millions): End of period/year $ 130.18 $ 126.52 $ 119.02 $ 107.61 $ 94.40 $ 83.59 Ratio of operating expenses to average net assets 1.31%(e) 1.17% 1.45% 1.63% 1.65% 1.27% Ratio of interest expense to average net assets 0.57%(e) 0.57% 0.80% 0.89% 0.97% 1.08% Ratio of total expenses before custodian reduction to average net assets 1.88%(e) 1.78% 2.28% 2.52% 2.62% 2.35% Ratio of net expenses after custodian reduction to average net assets 1.88%(e) 1.74% 2.25% 2.52% 2.62% 2.35% Ratio of net investment income to average net assets 8.67%(e) 8.43% 8.45% 9.60% 8.55% 9.42% Portfolio turnover 12.68% 34.14% 31.50% 51.25% 55.08% 35.32% (a) Calculated using average shares. (b) Net realized and unrealized loss rounds to $(0.00) per share. (c) Amount includes $0.10 per share in litigation proceeds. (d) Net asset value return represents portfolio returns based on change in the Trust's net asset value assuming the reinvestment of all dividends and distributions which differs from the total investment return based on the Trust's market value due to the difference between the Trust's net asset value and the market value of its shares outstanding; past performance is no guarantee of future results. (e) Annualized. Senior securities: Total principal amount (in millions) $ 12 $ 12 $ 12 $ 22.5 $ 22.5 $ 22.5 Asset coverage per $1,000 of indebtedness $ 11,849 $ 11,543 $ 10,918 $ 5,783 $ 5,195 $ 4,715 SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ----------------------------------------------------------------------------------------------------------------------------------- 6 CONSOLIDATED SCHEDULE OF INVESTMENTS MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES - 79.86%:(A) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- PRIVATE PLACEMENT INVESTMENTS - 74.67% A T I ACQUISITION COMPANY A for-profit post-secondary school serving students in Texas, Florida and Arizona. 12% Senior Subordinated Note due 2012 $ 1,125,000 04/08/04 $ 1,125,000 $ 1,130,204 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 1,230 shs. 04/08/04 -- 12 Warrant, exercisable until 2012, to purchase preferred stock at $.01 per share 33,505 shs. 03/23/06 33,860 33,860 ------------- ------------- 1,158,860 1,164,076 ------------- ------------- AERO HOLDINGS, INC. A provider of geospatial services to corporate and government clients. 10.5% Senior Secured Term Note due 2014 $ 930,000 03/09/07 916,050 903,808 14% Senior Subordinated Note due 2015 $ 720,000 03/09/07 643,525 697,453 Common Stock (B) 150,000 shs. 03/09/07 150,000 142,500 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 37,780 shs. 03/09/07 63,730 378 ------------- ------------- 1,773,305 1,744,139 ------------- ------------- AMERICAN HOSPICE MANAGEMENT HOLDING LLC A for-profit hospice care provider in the United States. 12% Senior Subordinated Note due 2010 $ 1,125,000 01/22/04 1,037,603 1,126,574 Preferred Class A Unit (B) 1,706 uts. * 170,600 187,660 Common Class B Unit (B) 16,100 uts. 01/22/04 1 47,533 Common Class D Unit (B) 3,690 uts. 09/12/06 -- 10,894 ------------- ------------- 1,208,204 1,372,661 ------------- ------------- 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 $ 861,702 05/18/05 814,888 863,263 Common Stock (B) 263 shs. 05/18/05 263,298 137,400 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 69 shs. 05/18/05 59,362 36,022 ------------- ------------- 1,137,548 1,036,685 ------------- ------------- AUGUSTA SPORTSWEAR HOLDING CO. A manufacturer and distributor of athletic apparel, activewear and team uniforms. 12% Senior Subordinated Note due 2012 $ 893,000 12/31/04 842,860 919,790 Common Stock (B) 275 shs. ** 275,108 632,798 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 73 shs. 12/31/04 63,254 167,429 ------------- ------------- 1,181,222 1,720,017 ------------- ------------- BETA BRANDS LTD. A manufacturer of hard candy and chocolate-coated products sold primarily to the Canadian market. 5% Promissory Note due 2009 (B) $ 96,698 03/31/04 96,698 -- Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 2,421 shs. 03/31/04 1 -- ------------- ------------- 96,699 -- ------------- ------------- *01/22/04 and 09/12/06. **12/31/04, 03/31/05 and 05/02/06. --------------------------------------------------------------------------------------------------------------------------------- 7 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- 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 $ 1,138,635 $ 1,163,672 Preferred Stock Class A (B) 465 shs. 06/30/06 141,946 127,752 Common Stock (B) 1 sh. 06/30/06 152 137 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 164 shs. 06/30/06 48,760 2 ------------- ------------- 1,329,493 1,291,563 ------------- ------------- CAPESUCCESS LLC A provider of diversified staffing services. Preferred Membership Interests (B) 806 uts. 04/29/00 3,598 180 Common Membership Interests (B) 10,421 uts. 04/29/00 46,706 2,332 ------------- ------------- 50,304 2,512 ------------- ------------- CAPITAL SPECIALTY PLASTICS, INC. A producer of desiccant strips used for packaging pharmaceutical products. Common Stock (B) 55 shs. * 252 223,573 ------------- ------------- COEUR, INC. A producer of proprietary, disposable power injection syringes. 8.75% Senior Secured Term Note due 2010 $ 202,899 04/30/03 202,899 205,317 11.5% Senior Subordinated Note due 2011 $ 242,754 04/30/03 228,525 242,901 Common Stock (B) 72,464 shs. 04/30/03 72,463 198,857 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 50,099 shs. 04/30/03 23,317 137,483 ------------- ------------- 527,204 784,558 ------------- ------------- COINING CORPORATION OF AMERICA LLC A manufacturer of close tolerance parts and metal stampings. 10.6% Senior Secured Revolving Credit Facility due 2007 (C) $ 49,383 01/07/02 49,383 49,383 10.6% Senior Secured Tranche A Note due 2007 (C) $ 319,286 06/26/01 319,286 318,385 13% Senior Secured Tranche B Note due 2008 $ 370,370 06/26/01 370,370 370,370 Limited Liability Company Unit 185,185 uts. 06/26/01 185,185 556,629 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 61,163 shs. 06/26/01 45,370 183,844 ------------- ------------- 969,594 1,478,611 ------------- ------------- 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 1,236,494 Limited Liability Company Unit Class A (B) 82,616 uts. 01/12/07 82,613 78,482 Limited Liability Company Unit Class C (B) 59,756 uts. 01/12/07 59,756 56,769 ------------- ------------- 1,324,652 1,371,745 ------------- ------------- *12/30/97 and 05/29/99. --------------------------------------------------------------------------------------------------------------------------------- 8 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- CONNOR SPORT COURT INTERNATIONAL, INC. A designer and manufacturer of outdoor and indoor synthetic sports flooring and other temporary flooring products. 12% Senior Subordinated Note due 2012 (D) $ 1,059,417 * $ 974,588 $ 529,709 Limited Partnership Interest (B) 4.43% int. ** 103,135 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 92 shs. * 84,829 -- ------------- ------------- 1,162,552 529,709 ------------- ------------- CONSOLIDATED FOUNDRIES HOLDINGS A manufacturer of engineered cast metal components for the global aerospace and defense industries. 12% Senior Subordinated Note due 2013 $ 1,157,143 06/15/05 1,112,792 1,168,714 Common Stock (B) 269 shs. *** 278,521 393,383 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 54 shs. 06/15/05 53,295 79,562 ------------- ------------- 1,444,608 1,641,659 ------------- ------------- 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 1,287,499 1,356,431 Warrant, exercisable until 2013, to purchase common stock at $.001 per share (B) 10 shs. 08/04/05 72,617 31,549 ------------- ------------- 1,360,116 1,387,980 ------------- ------------- 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 10/30/06 916,664 986,271 Limited Partnership Interest (B) 371,739 uts. 10/30/06 371,739 353,152 Warrant, exercisable until 2014, to purchase preferred stock at $.01 per share (B) 26 shs. 10/30/06 26,380 -- Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 18 shs. 10/30/06 18,000 -- ------------- ------------- 1,332,783 1,339,423 ------------- ------------- DELTACOM A provider of integrated communications services in the southeastern United States. 13.88% Senior Secured Note due 2009 (C) $ 1,196,190 07/26/05 1,172,771 1,220,114 17.38% Senior Secured Note due 2009 (C) $ 197,602 07/26/05 174,770 196,614 Warrant, exercisable until 2009, to purchase convertible preferred stock at $.03 per share (B) 54,468 shs. 07/26/05 18,156 303,387 ------------- ------------- 1,365,697 1,720,115 ------------- ------------- DEXTER MAGNETICS TECHNOLOGIES, INC. A designer, fabricator, assembler and distributor of industrial magnets and subassemblies in North America and Europe. Common Stock (B) 310 shs. 07/19/01 185,869 901,924 Warrant, exercisable until 2007, to purchase common stock at $.01 per share 157 shs. 07/19/01 69,872 457,135 ------------- ------------- 255,741 1,359,059 ------------- ------------- *08/12/04 and 01/18/05. **08/12/04 and 01/14/05. ***06/15/05 and 05/22/06. --------------------------------------------------------------------------------------------------------------------------------- 9 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- DIRECTED ELECTRONICS, INC. A designer and distributor of brand name automotive security systems, audio products and installation accessories. Common Stock (B) 195,118 shs. * $ 982,868 $ 1,724,842 ------------- ------------- 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) 1,639 shs. 12/14/01 1,392,067 -- Warrants, exercisable until 2011, to purchase common stock of DHI Holdings, Inc. at $.01 per share (B) 6,676 shs. ** 201,655 -- ------------- ------------- 1,960,217 -- ------------- ------------- DUNCAN SYSTEMS, INC. A distributor of windshields and side glass for the recreational vehicle market. 10% Senior Secured Term Note due 2013 $ 308,571 11/01/06 303,942 305,798 13% Senior Subordinated Note due 2014 $ 488,572 11/01/06 436,282 483,400 Common Stock (B) 102,857 shs. 11/01/06 102,857 97,714 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 32,294 shs. 11/01/06 44,663 323 ------------- ------------- 887,744 887,235 ------------- ------------- DWYER GROUP, INC. A franchiser of a variety of home repair services. Common Stock (B) 3,656 shs. *** 365,600 431,035 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 1,077 shs. 10/30/03 98,719 126,930 ------------- ------------- 464,319 557,965 ------------- ------------- 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 83,546 ------------- ------------- EAGLE PACK PET FOODS, INC. A manufacturer of premium pet food sold through independent pet stores. 12% Senior Subordinated Note due 2011 $ 803,572 **** 784,761 811,608 Warrant, exercisable until 2011, to purchase common stock at $.02 per share (B) 2,163 shs. 09/24/04 20,893 53,528 ------------- ------------- 805,654 865,136 ------------- ------------- ELECTRA BICYCLE COMPANY, INC. A designer and marketer of branded leisure bicycles. 10.5% Senior Secured Term Note A due 2009 $ 145,749 04/12/07 142,834 144,548 10.5% Senior Secured Term Note B due 2012 $ 437,247 04/12/07 428,502 431,760 12% Senior Secured Term Note C due 2012 $ 291,498 04/12/07 271,410 285,046 Limited Liability Company Unit Series F (B) 36,913 uts. 04/12/07 36,913 35,068 Limited Liability Company Unit Series G (B) 2,852 uts. 04/12/07 2,852 2,709 ------------- ------------- 882,511 899,131 ------------- ------------- *12/19/05 and 06/17/06. **10/24/96 and 08/28/98. ***10/30/03 and 01/02/04. ****09/24/04 and 04/20/06. --------------------------------------------------------------------------------------------------------------------------------- 10 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- ENZYMATIC THERAPY, INC. A manufacturer and distributor of branded natural medicines and nutritional supplements. Limited Partnership Interest (B) 0.70% int. 03/30/00 $ 281,250 $ 33,750 Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 15,415 shs. 03/30/00 135,000 22,500 ------------- ------------- 416,250 56,250 ------------- ------------- EVANS CONSOLES, INC. A designer and manufacturer of consoles and control center systems. Common Stock 45,000 shs. 05/06/04 6 -- ------------- ------------- F H S HOLDINGS LLC A national provider of customized disease management services to large self-insured employers. 12% Senior Subordinated Note due 2014 $ 1,265,625 06/01/06 1,181,208 1,268,966 Preferred Unit (B) 84 uts. 06/01/06 83,524 75,177 Common Unit (B) 844 uts. 06/01/06 844 759 Common Unit Class B (B) 734 shs. 06/01/06 64,779 58,301 ------------- ------------- 1,330,355 1,403,203 ------------- ------------- 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 $ 524,791 04/13/06 516,919 522,081 14% Senior Subordinated Note due 2014 $ 317,177 04/13/06 285,591 315,955 Common Stock (B) 62,535 shs. 04/13/06 62,535 56,282 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 17,680 shs. 04/13/06 27,676 177 ------------- ------------- 892,721 894,495 ------------- ------------- FOWLER HOLDING, INC. A provider of site development services to residential homebuilders and developers in the Raleigh/Durham region of North Carolina. 12% Senior Subordinated Note due 2013 $ 1,252,174 02/03/06 1,137,539 1,223,606 Common Stock (B) 98 shs. 02/03/06 97,826 35,019 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 135 shs. 02/03/06 110,348 48,143 ------------- ------------- 1,345,713 1,306,768 ------------- ------------- FUEL SYSTEMS HOLDING CORPORATION An independent North American supplier of fuel tanks for a wide variety of commercial vehicles. 12% Senior Subordinated Note due 2014 $ 1,237,500 01/31/06 1,156,429 1,214,564 Common Stock (B) 112,500 shs. 01/31/06 112,500 145,234 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 73,275 shs. 01/31/06 63,113 94,596 ------------- ------------- 1,332,042 1,454,394 ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 11 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- H M HOLDING COMPANY A designer, manufacturer, and importer of promotional and wood furniture. 12% Senior Subordinated Note due 2013 $ 1,170,000 02/10/06 $ 1,090,964 $ 1,074,448 Common Stock (B) 180 shs. 02/10/06 180,000 144,000 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 67 shs. 02/10/06 61,875 1 ------------- ------------- 1,332,839 1,218,449 ------------- ------------- 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 * 998,123 1,082,913 Common Stock (B) 33 shs. * 33,216 46,554 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 106 shs. * 105,618 148,013 ------------- ------------- 1,136,957 1,277,480 ------------- ------------- INTEGRATION TECHNOLOGY SYSTEMS, INC. A manufacturer of steel protective computer and network systems for the industrial and office environments. 12% Senior Secured Note due 2008 $ 949,004 03/01/04 938,546 474,502 Common Stock (B) 130 shs. 06/01/00 149,500 -- ------------- ------------- 1,088,046 474,502 ------------- ------------- JASON, INC. A diversified manufacturing company serving various industrial markets. 13% Senior Subordinated Note due 2008 $ 510,187 08/04/00 494,419 505,085 Limited Partnership Interest of Saw Mill Capital Fund II, L.P. (B) 1.30% int. 08/03/00 469,245 325,646 Warrants, exercisable until 2008 and 2009, to purchase common stock at $.01 per share (B) 26,931 shs. 08/04/00 61,101 65,399 ------------- ------------- 1,024,765 896,130 ------------- ------------- JUSTRITE MANUFACTURING ACQUISITION CO. A manufacturer of safety products such as storage cabinets and containers. 12% Senior Subordinated Note due 2011 $ 843,750 12/15/04 803,329 852,136 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 594 shs. 12/15/04 53,528 102,680 ------------- ------------- 856,857 954,816 ------------- ------------- K N B HOLDINGS CORPORATION A designer, manufacturer and marketer of products for the custom framing market. 13.5% Senior Subordinated Note due 2013 $ 1,295,329 05/25/06 1,235,639 1,278,447 Common Stock (B) 71,053 shs. 05/25/06 71,053 63,948 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 43,600 shs. 05/25/06 37,871 436 ------------- ------------- 1,344,563 1,342,831 ------------- ------------- *06/30/04 and 08/19/04. --------------------------------------------------------------------------------------------------------------------------------- 12 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- K W P I HOLDINGS CORPORATION A manufacturer and distributor of vinyl windows and patio doors throughout the northwestern United States. 12% Senior Subordinated Note due 2014 $ 1,227,000 03/14/07 $ 1,119,031 $ 1,197,522 Common Stock (B) 123 shs. 03/13/07 123,000 116,850 Warrant, exercisable until 2017, to purchase common stock at $.01 per share (B) 89 shs. 03/14/07 85,890 1 ------------- ------------- 1,327,921 1,314,373 ------------- ------------- KEEPSAKE QUILTING, INC. A seller of quilting fabrics, books, patterns, kits and notions to consumers. 8.86% Senior Secured Revolving Note due 2008 (C) $ 136,287 06/16/00 136,287 135,112 12% Senior Secured Tranche B Note due 2008 $ 314,509 06/16/00 309,867 314,509 Limited Partnership Interest of Riverside XVI Holding Company, L.P. (B) 3.02% int. 06/12/00 190,563 301,428 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 633 shs. 06/12/00 26,209 101,041 ------------- ------------- 662,926 852,090 ------------- ------------- KELE AND ASSOCIATES, INC. A distributor of building automation control products. 12% Senior Subordinated Note due 2012 $ 969,643 02/27/04 902,683 979,339 Common Stock 6 shs. 02/27/04 6,814 166,746 Warrant, exercisable until 2012, to purchase common stock at $.02 per share 6 shs. 02/27/04 4,124 152,505 ------------- ------------- 913,621 1,298,590 ------------- ------------- LIH INVESTORS, L.P. A manufacturer and marketer of a broad line of external accessories for new and used sport utility vehicles, trucks and vans. 12.5% Senior Subordinated Note due 2008 (D) $ 2,036,000 * 1,899,714 -- Common Stock (B) 3,057 shs. * 213,998 -- Warrant, exercisable until 2008, to purchase common stock at $.11 per share (B) 8,245 shs. * 318,838 -- ------------- ------------- 2,432,550 -- ------------- ------------- MAGNATECH INTERNATIONAL, INC. A supplier of process equipment and related parts used in the manufacturing of medium and high-pressure reinforced hoses. 12% Senior Subordinated Note due 2014 $ 618,750 04/05/06 577,414 623,552 13% Preferred Stock (B) 299 shs. 04/05/06 299,295 338,209 Common Stock (B) 66 shs. 04/05/06 66,202 228,291 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 7 shs. 04/05/06 6,832 23,553 ------------- ------------- 949,743 1,213,605 ------------- ------------- 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 05/04/07 483,072 499,984 Limited Liability Company Unit (B) 12,176 uts. 05/04/07 158,824 150,883 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 1,787 shs. 05/04/07 22,781 18 ------------- ------------- 664,677 650,885 ------------- ------------- *12/23/98 and 01/28/99. --------------------------------------------------------------------------------------------------------------------------------- 13 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- MAVERICK ACQUISITION COMPANY A manufacturer of capsules that cover the cork and neck of wine bottles. 9.85% Senior Secured Tranche A Note due 2010 (C) $ 346,362 09/03/04 $ 346,362 $ 347,786 12% Senior Secured Tranche B Note due 2011 $ 179,104 09/03/04 162,874 178,405 Limited Partnership Interest (B) 4.48% int. 09/03/04 33,582 27,753 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 243 shs. 09/03/04 22,556 20,052 ------------- ------------- 565,374 573,996 ------------- ------------- MAXON CORPORATION A manufacturer of industrial combustion equipment and related shut-off valves and control valves. 12% Senior Subordinated Note due 2012 $ 549,837 09/30/04 510,555 559,497 8.75% Senior Subordinated Note due 2012 $ 660,322 09/30/04 660,322 673,332 Common Stock (B) 218,099 shs. 09/30/04 218,099 754,421 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 87,755 shs. 09/30/04 51,941 303,552 ------------- ------------- 1,440,917 2,290,802 ------------- ------------- MEDASSIST, INC. A provider of patient eligibility and accounts receivable management services to hospitals and physician practices. 8% Preferred Stock (B) 44 shs. 10/28/04 44,289 43,975 Common Stock (B) 13,863 shs. 10/28/04 18,576 62,030 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 44,808 shs. 05/01/03 21,534 200,498 ------------- ------------- 84,399 306,503 ------------- ------------- 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 $ 1,421,795 * 1,341,421 1,430,177 Common Stock (B) 238 shs. * 238,000 206,716 Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 87 shs. * 86,281 75,399 ------------- ------------- 1,665,702 1,712,292 ------------- ------------- MOMENTUM HOLDING CO. A designer and supplier of upholstery fabric to commercial furniture manufacturers and architectural and design firms. 12% Senior Subordinated Note due 2014 $ 618,802 08/04/06 553,324 618,512 Limited Partnership Interest (B) 56,198 uts. 08/04/06 56,198 50,578 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 586 shs. 08/04/06 56,705 6 ------------- ------------- 666,227 669,096 ------------- ------------- MONESSEN HOLDING CORPORATION A designer and manufacturer of a broad line of gas, wood and electric hearth products and accessories. 12% Senior Subordinated Note due 2014 $ 1,350,000 03/31/06 1,256,382 1,271,615 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 81 shs. 03/31/06 73,125 1 ------------- ------------- 1,329,507 1,271,616 ------------- ------------- *08/12/05 and 09/11/06. --------------------------------------------------------------------------------------------------------------------------------- 14 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- MORTON INDUSTRIAL GROUP, INC. A manufacturer of highly engineered metal fabricated components. 12% Senior Subordinated Note due 2014 $ 1,292,246 08/25/06 $ 1,191,721 $ 1,250,759 Common Stock (B) 57,754 shs. 08/25/06 57,754 46,203 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 91,923 shs. 08/25/06 79,380 919 ------------- ------------- 1,328,855 1,297,881 ------------- ------------- MOSS, INC. A manufacturer and distributor of large display and exhibit structures. Limited Partnership Interest of Riverside Capital Appreciation Fund I, L.P. (B) 19.20% int. * 199,301 232,238 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 122 shs. 12/21/05 20,941 14,218 ------------- ------------- 220,242 246,456 ------------- ------------- NABCO, INC. A producer of explosive containment vessels in the United States. 12% Senior Subordinated Note due 2014 $ 330,882 02/24/06 306,603 289,960 Limited Liability Company Unit (B) 437 uts. ** 436,984 349,584 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 26 shs. 02/24/06 19,687 -- ------------- ------------- 763,274 639,544 ------------- ------------- NAVIS GLOBAL A designer, manufacturer, seller and servicer of finishing machinery for the knit and woven segments of the global textile industry. 12% Senior Subordinated Note due 2014 $ 705,457 05/28/04 646,836 692,304 8.75% Senior Secured Note due 2011 $ 409,310 05/28/04 409,310 407,030 Common Stock (B) 385,233 shs. 05/28/04 385,233 327,448 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 116,521 shs. 05/28/04 74,736 1,165 ------------- ------------- 1,516,115 1,427,947 ------------- ------------- 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 02/02/07 745,713 782,058 Limited Partnership Interest of Saw Mill PCG Partners LLC (B) 540 uts. 02/01/07 540,000 513,000 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 48 shs. 02/02/07 48,087 -- ------------- ------------- 1,333,800 1,295,058 ------------- ------------- *09/20/00, 05/23/02 and 02/21/07. **02/24/06 and 06/22/07. --------------------------------------------------------------------------------------------------------------------------------- 15 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- NONNI'S FOOD COMPANY A producer and distributor of premium biscotti and bagel chips in North America. 12.25% Senior Subordinated Note due 2012 $ 986,538 03/29/04 $ 982,661 $ 991,876 10% Preferred Stock (B) 135 shs. 03/29/04 135,044 135,542 Common Stock (B) 3,418 shs. 03/29/04 3,418 77,380 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 4,565 shs. 03/29/04 3,877 103,339 ------------- ------------- 1,125,000 1,308,137 ------------- ------------- NYLONCRAFT, INC. A supplier of engineered plastic components for the automotive industry. 9% Senior Secured Note due 2009 $ 464,286 01/28/02 464,286 441,072 11.5% Senior Subordinated Note due 2012 $ 857,143 01/28/02 803,378 428,572 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 -- ------------- ------------- 1,538,832 869,644 ------------- ------------- O R S NASCO HOLDING, INC. A wholesale distributor of industrial supplies in North America. 13% Senior Subordinated Note due 2013 $ 1,256,152 12/20/05 1,184,532 1,281,275 Common Stock (B) 93,848 shs. 12/20/05 93,848 171,714 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 52,820 shs. 12/20/05 52,292 96,645 ------------- ------------- 1,330,672 1,549,634 ------------- ------------- 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 $ 323,115 01/03/06 318,268 321,551 13% Senior Subordinated Note due 2013 $ 392,709 01/03/06 353,241 390,791 Common Stock (B) 184,176 shs. 01/03/06 184,176 165,758 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 43,073 shs. 01/03/06 35,900 431 ------------- ------------- 891,585 878,531 ------------- ------------- OLYMPIC SALES, INC. A boat retailer in Washington state, Oregon, California and British Columbia. 12% Senior Subordinated Note due 2008 $ 620,500 08/07/98 620,500 606,977 12% Senior Subordinated Note due 2008 $ 244,154 02/09/00 240,037 241,236 Limited Partnership Interest of Riverside VIII, VIII-A and VIII-B Holding Company, L.P. 10.66% int. * 808,386 808,347 Warrants, exercisable until 2007 and 2008, to purchase common stock at $.01 per share (B) 15,166 shs. ** 206,041 31,394 ------------- ------------- 1,874,964 1,687,954 ------------- ------------- *08/07/98, 02/23/99, 12/22/99 and 02/25/03. **08/07/98 and 02/29/00. --------------------------------------------------------------------------------------------------------------------------------- 16 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- ONTARIO DRIVE & GEAR LTD. A manufacturer of all-wheel drive, off-road amphibious vehicles and related accessories. 13% Senior Subordinated Note due 2013 $ 1,047,115 01/17/06 $ 949,533 $ 1,050,917 Limited Liability Company Unit (B) 1,942 uts. 01/17/06 302,885 379,359 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 328 shs. 01/17/06 90,424 64,050 ------------- ------------- 1,342,842 1,494,326 ------------- ------------- OVERTON'S HOLDING COMPANY A marketer of marine and water sports accessories in the United States. 12% Senior Subordinated Note due 2014 $ 962,104 04/28/06 902,807 953,416 Common Stock (B) 50 shs. 04/28/06 50,000 45,000 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 49 shs. 04/28/06 44,322 -- ------------- ------------- 997,129 998,416 ------------- ------------- 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 $ 1,164,792 07/03/06 1,107,882 1,188,560 Preferred Unit (B) 202 uts. 07/03/06 202,320 192,204 Preferred Unit (B) 36 uts. 07/03/06 36,420 34,599 Common Unit Class I (B) 78 uts. 07/03/06 -- 1 Common Unit Class L (B) 17 uts. 07/03/06 -- -- ------------- ------------- 1,346,622 1,415,364 ------------- ------------- 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 1,139,056 1,227,461 Preferred Stock (B) 19 shs. 03/31/06 174,492 187,187 Common Stock (B) 12 shs. 03/31/06 13,500 19,854 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 7 shs. 03/31/06 5,888 11,553 ------------- ------------- 1,332,936 1,446,055 ------------- ------------- PACIFIC CONSOLIDATED HOLDINGS LLC A manufacturer of rugged, mobile liquid and gaseous oxygen and nitrogen generating systems used in the global defense, oil & gas and medical sectors. 12% Senior Subordinated Note due 2012 $ 690,683 04/27/07 629,139 680,863 Limited Liability Company Unit (B) 928,962 uts. 04/27/07 33,477 31,771 ------------- ------------- 662,616 712,634 ------------- ------------- PARADIGM PACKAGING, INC. A manufacturer of plastic bottles and closures for the nutritional, pharmaceutical, personal care and food packaging markets. 12% Senior Subordinated Note due 2008 $ 1,125,000 12/19/00 1,085,379 1,121,532 Membership Interests of MM/Lincap PPI Investments, Inc., LLC (B) 1.28% int. 12/21/00 140,625 223,152 ------------- ------------- 1,226,004 1,344,684 ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 17 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- POSTLE ALUMINUM COMPANY LLC A manufacturer and distributor of aluminum extruded products. 12% Senior Subordinated Note due 2014 $ 1,080,000 10/02/06 $ 1,001,420 $ 1,086,705 Limited Liability Company Unit (B) 733 uts. 10/02/06 270,000 256,499 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 182 shs. 10/02/06 65,988 2 ------------- ------------- 1,337,408 1,343,206 ------------- ------------- PROTEIN GENETICS, INC. A producer of bovine artificial insemination products, related breeding and healthcare products and specialty genetics sold to the dairy and beef industries. 9.8% Redeemable Exchangeable Preferred Stock (B) 332 shs. 08/12/94 33,217 -- Common Stock (B) 867 shs. * 42,365 -- ------------- ------------- 75,582 -- ------------- ------------- QUALIS AUTOMOTIVE LLC A distributor of aftermarket automotive brake and chassis products. 12% Senior Subordinated Note due 2012 $ 937,500 05/28/04 797,018 924,503 Common Stock 187,500 shs. 05/28/04 187,500 64,525 Warrant, exercisable until 2012, to purchase common stock at $.01 per share 199,969 shs. 05/28/04 199,969 68,816 ------------- ------------- 1,184,487 1,057,844 ------------- ------------- QUALSERV CORPORATION A provider of foodservice equipment and supplies to major restaurant chains and their franchisees. 14% Senior Subordinated Note due 2012 (D) $ 1,002,475 07/09/04 976,254 -- Limited Partnership Interest (B) 4.90% int. 07/09/04 137,195 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 280 shs. 07/09/04 25,973 -- ------------- ------------- 1,139,422 -- ------------- ------------- R A J Manufacturing Holdings LLC A designer and manufacturer of women's swimwear sold under a variety of licensed brand names. 12.5% Senior Subordinated Note due 2014 $ 1,200,277 12/15/06 1,106,663 1,218,191 Limited Liability Company Unit (B) 1,497 uts. 12/15/06 149,723 142,237 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 2 shs. 12/15/06 69,609 -- ------------- ------------- 1,325,995 1,360,428 ------------- ------------- Radiac Abrasives, Inc. A manufacturer of bonded abrasive and super abrasive grinding wheels in the United States. 12% Senior Subordinated Note due 2014 $ 1,196,809 02/10/06 1,116,520 1,232,713 Common Stock (B) 153,191 shs. 02/10/06 153,191 137,872 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 69,647 shs. 02/10/06 63,421 696 ------------- ------------- 1,333,132 1,371,281 ------------- ------------- *08/12/94 and 11/14/01. --------------------------------------------------------------------------------------------------------------------------------- 18 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- RIVER RANCH FRESH FOODS LLC A supplier of fresh produce to the retail and foodservice channels. 13% Senior Subordinated Note due 2011 (D) $ 975,000 09/29/04 $ 891,404 $ 780,000 Limited Liability Company Unit (B) 248,916 uts. * 377,417 -- Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 12,481 shs. 09/29/04 83,596 -- ------------- ------------- 1,352,417 780,000 ------------- ------------- ROYAL BATHS MANUFACTURING COMPANY A manufacturer and distributor of acrylic and cultured marble bathroom products. 12.5% Senior Subordinated Note due 2011 $ 562,500 11/14/03 518,342 573,750 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 74 shs. 11/14/03 65,089 85,198 ------------- ------------- 583,431 658,948 ------------- ------------- 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. 06/02/99 146,456 662,596 ------------- ------------- Savage Sports Holding, Inc. A manufacturer of sporting firearms. 12% Senior Subordinated Note due 2012 $ 814,655 09/10/04 767,992 835,988 Common Stock (B) 310 shs. 09/10/04 310,345 430,392 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 71 shs. 09/10/04 60,129 98,102 ------------- ------------- 1,138,466 1,364,482 ------------- ------------- SPECIALTY FOODS GROUP, INC. A manufacturer and distributor of branded meat products. Limited Partnership Interest of MHD Holdings LLC 0.76% int. 08/29/00 363,576 -- ------------- ------------- 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 1,115,390 1,174,724 Common Stock (B) 165 shs. 08/01/06 164,634 148,167 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 55 shs. 08/01/06 49,390 1 ------------- ------------- 1,329,414 1,322,892 ------------- ------------- STRATEGIC EQUIPMENT & SUPPLY CORPORATION, INC. A provider of kitchen and restaurant design, equipment fabrication and installation services. Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 61,862 shs. 01/14/00 382,501 -- ------------- ------------- SYNVENTIVE EQUITY LLC A manufacturer of hot runner systems used in the plastic injection molding process. Limited Liability Company Unit (B) 1.05% int. 08/20/03 33,462 7,465 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 45,942 shs. 08/21/03 10,249 10,249 ------------- ------------- 43,711 17,714 ------------- ------------- *09/29/04, 06/04/07 and 06/14/07. --------------------------------------------------------------------------------------------------------------------------------- 19 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- TANGENT RAIL CORPORATION A manufacturer of rail ties and provides specialty services to the North American railroad industry. 13% Senior Subordinated Note due 2013 $ 1,173,909 10/14/05 $ 1,015,682 $ 1,197,387 Common Stock (B) 1,167 shs. 10/14/05 1,167 373,268 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 618 shs. 10/14/05 155,860 197,669 ------------- ------------- 1,172,709 1,768,324 ------------- ------------- TERRA RENEWAL SERVICES, INC. A provider of wastewater residual management and required environmental reporting, permitting, nutrient management planning and record keeping to companies involved in poultry and food processing. 8.61% Senior Secured Tranche B Note due 2012 (C) $ 828,594 * 825,377 820,719 10.5% Senior Secured Tranche B Note due 2012 (C) $ 43,421 * 43,421 43,008 12% Senior Subordinated Note due 2014 $ 664,062 ** 632,950 658,410 Limited Partnership Interest of Saw Mill Capital Fund V, L.P. 2.30% int. 03/01/05 66,448 75,335 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 41 shs. 04/28/06 34,627 18,832 ------------- ------------- 1,602,823 1,616,304 ------------- ------------- TOTAL EQUIPMENT & SERVICE, 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 03/02/07 479,190 475,994 13% Senior Subordinated Note due 2014 $ 341,971 03/02/07 280,347 332,615 Common Stock (B) 71,542 shs. 03/02/07 71,542 67,965 Warrant, exercisable until 2014 to purchase common stock at $.01 per share (B) 19,733 shs. 03/02/07 54,784 197 ------------- ------------- 885,863 876,771 ------------- ------------- THE TRANZONIC COMPANIES A producer of commercial and industrial supplies, such as safety products, janitorial supplies, work apparel, washroom and restroom supplies and sanitary care products. 13% Senior Subordinated Note due 2009 $ 1,356,000 02/05/98 1,297,089 1,356,000 Common Stock (B) 315 shs. 02/04/98 315,000 108,755 Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 222 shs. 02/05/98 184,416 76,647 ------------- ------------- 1,796,505 1,541,402 ------------- ------------- TRANSTAR HOLDING COMPANY A distributor of aftermarket automotive transmission parts. 12% Senior Subordinated Note due 2013 $ 918,000 08/31/05 882,371 932,393 Common Stock (B) 571 shs. *** 570,944 569,295 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 46 shs. 08/31/05 41,021 45,369 ------------- ------------- 1,494,336 1,547,057 ------------- ------------- *04/28/06 and 12/21/06. **04/28/06 and 09/13/06. ***08/31/05 and 04/30/07. --------------------------------------------------------------------------------------------------------------------------------- 20 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount Date Cost Fair Value ------------- -------- ------------- ------------- TRONAIR, INC. A designer, engineer and manufacturer of ground support equipment for the business, commuter and commercial aviation markets. 10.5% Senior Secured Term Note due 2008 $ 225,806 01/20/00 $ 225,806 $ 227,000 12% Senior Subordinated Note due 2010 $ 758,100 01/20/00 739,641 773,686 Common Stock (B) 129,960 shs. 01/20/00 129,960 538,306 Warrant, exercisable until 2010, to purchase common stock at $1 per share (B) 148,911 shs. 01/20/00 56,316 616,803 ------------- ------------- 1,151,723 2,155,795 ------------- ------------- TRUCK BODIES & EQUIPMENT INTERNATIONAL A designer and manufacturer of accessories for heavy and medium duty trucks, primarily dump bodies, hoists, various forms of flat-bed bodies, landscape bodies and other accessories. 12% Senior Subordinated Note due 2013 $ 1,222,698 * 1,145,193 1,223,724 Common Stock (B) 393 shs. * 423,985 671,774 Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 81 shs. * 84,650 138,732 ------------- ------------- 1,653,828 2,034,230 ------------- ------------- TRUSTILE DOORS, INC. A manufacturer and distributor of interior doors. 12.5% Senior Subordinated Note due 2010 $ 562,500 04/11/03 536,384 568,125 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 3,060 shs. 04/11/03 46,291 145,363 ------------- ------------- 582,675 713,488 ------------- ------------- U S S HOLDINGS, INC. A producer of high grade industrial and specialty silica sands. 14% Redeemable Preferred Stock (B) 499 shs. 09/30/99 272,912 466,871 Convertible Preferred Stock Series A and B, convertible into common stock at $8.02 per share (B) 72,720 shs. 12/19/96 583,365 -- Common Stock (B) 10,013 shs. 09/30/99 399,505 -- Warrants, exercisable until 2010, to purchase common stock at $.01 per share (B) 2,459 shs. ** 64,182 -- ------------- ------------- 1,319,964 466,871 ------------- ------------- U-LINE CORPORATION A manufacturer of high-end, built-in, undercounter ice making, wine storage and refrigeration appliances. 12.5% Senior Subordinated Note due 2012 $ 996,500 04/30/04 913,123 996,500 Common Stock (B) 96 shs. 04/30/04 96,400 105,851 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 122 shs. 04/30/04 112,106 133,961 ------------- ------------- 1,121,629 1,236,312 ------------- ------------- VICTORY VENTURES LLC An acquirer of controlling or substantial interests in other entities. Series A Preferred Units 0.04% int. 12/02/96 1 -- ------------- ------------- *07/19/05 and 12/22/05. **12/19/96 and 09/30/99. --------------------------------------------------------------------------------------------------------------------------------- 21 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares, Units, Warrants, Ownership or Acquisition CORPORATE RESTRICTED SECURITIES:(A)(Continued) Principal Amount 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 $ 451,942 $ 450,798 13% Senior Subordinated Note due 2014 $ 370,588 05/17/07 332,050 365,819 Common Stock (B) 70,588 shs. 05/17/07 70,588 67,059 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 20,003 shs. 05/17/07 31,460 200 ------------- ------------- 886,040 883,876 ------------- ------------- VITALITY FOODSERVICE, INC. A non-carbonated beverage dispensing company focused on the foodservice industry. 15% Senior Subordinated Note due 2011 $ 1,074,090 09/24/04 994,954 966,682 Common Stock (B) 14,006 shs. * 140,064 112,048 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 12,593 shs. 09/24/04 98,938 100,744 ------------- ------------- 1,233,956 1,179,474 ------------- ------------- VITEX PACKAGING GROUP, INC. A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags. 12.5% Senior Subordinated Note due 2012 $ 900,000 07/19/04 785,148 822,421 Limited Liability Company Unit Class A (B) 0.93% int. 07/19/04 219,375 119,100 Limited Liability Company Unit Class B (B) 0.41% int. 07/19/04 96,848 52,580 ------------- ------------- 1,101,371 994,101 ------------- ------------- WALLS INDUSTRIES, INC. A provider of branded workwear and sporting goods apparel. 12.36% Senior Subordinated Lien Note due 2009 (C) $ 345,395 07/12/04 345,395 345,843 14% Senior Subordinated Note due 2012 $ 574,613 07/12/04 573,271 586,105 Limited Partnership Interest (B) 0.20% int. 07/12/04 19,737 416,705 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 2,133 shs. 07/12/04 1,500 45,039 ------------- ------------- 939,903 1,393,692 ------------- ------------- WELLBORN FOREST HOLDING CO. A manufacturer of semi-custom kitchen and bath cabinetry. 12.13% Senior Subordinated Note due 2014 $ 911,250 11/30/06 849,000 881,073 Common Stock (B) 101 shs. 11/30/06 101,250 96,188 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 51 shs. 11/30/06 45,790 1 ------------- ------------- 996,040 977,262 ------------- ------------- 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 05/14/07 557,515 597,078 Limited Partnership Interest (B) 61,308 uts. 05/14/07 61,308 58,243 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 47 shs. 05/14/07 44,186 -- ------------- ------------- 663,009 655,321 ------------- ------------- TOTAL PRIVATE PLACEMENT INVESTMENTS $ 97,769,428 $ 97,211,042 ============= ============= *09/24/04 and 12/22/06. --------------------------------------------------------------------------------------------------------------------------------- 22 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares or Interest Due Principal CORPORATE RESTRICTED SECURITIES(A)(Continued) Rate Date Amount Cost Fair Value ------- -------- ------------ ------------ ------------ RULE 144A SECURITIES - 5.19%: (A) BONDS - 5.19% Aramark Corporation 8.500% 02/01/15 $ 100,000 $ 100,000 $ 101,500 Aramark Corporation (C) 8.856 02/01/15 100,000 100,000 101,500 Bombardier, Inc. 6.300 05/01/14 500,000 440,315 475,000 Bristow Group Inc. 7.500 09/15/17 75,000 75,000 75,188 Charter Communications Op LLC 8.000 04/30/12 250,000 249,375 253,125 Community Health Systems 8.875 07/15/15 450,000 446,823 456,188 Douglas Dynamics LLC 7.750 01/15/12 325,000 326,475 308,750 G F S I, Inc. (C) 11.500 06/01/11 375,000 340,343 386,250 H C A, Inc. 9.250 11/15/16 500,000 508,663 532,500 Packaging Dynamics Corporation of America 10.000 05/01/16 850,000 859,933 854,250 Rental Service Corporation 9.500 12/01/14 500,000 507,119 510,000 Steel Dynamics, Inc. 6.750 04/01/15 100,000 100,000 97,250 Stewart & Stevenson LLC 10.000 07/15/14 750,000 771,056 783,750 Tenaska Alabama Partners LP 7.000 06/30/21 176,110 176,110 180,201 Tesoro Petroleum Corporation 6.500 06/01/17 250,000 250,000 244,375 Transdigm, Inc. 7.750 07/15/14 150,000 151,449 151,500 Tube City IMS Corporation 9.750 02/01/15 320,000 332,590 328,000 Tunica-Biloxi Gaming Authority 9.000 11/15/15 500,000 516,338 522,500 Valassis Communications, Inc. 8.250 03/01/15 400,000 390,300 390,000 ------------ ------------ TOTAL BONDS $ 6,641,889 6,751,827 ------------ ------------ WARRANTS - 0.00% WINSLOEW FURNITURE, INC. (B) 700 $ 7 $ -- ------------ ------------ TOTAL WARRANTS 7 -- ------------ ------------ TOTAL RULE 144A SECURITIES 6,641,896 6,751,827 ------------ ------------ TOTAL CORPORATE RESTRICTED SECURITIES $104,411,324 $103,962,869 ------------ ------------ --------------------------------------------------------------------------------------------------------------------------------- 23 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Interest Due Principal CORPORATE PUBLIC SECURITIES - 22.41%: (A) Rate Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ BONDS - 21.51% Allied Waste NA 7.875% 04/15/13 $ 500,000 $ 513,428 $ 505,625 Appleton Papers, Inc. 8.125 06/15/11 250,000 250,000 257,500 Atlas Pipeline Partners 8.125 12/15/15 600,000 612,034 598,500 Basic Energy Services 7.125 04/15/16 625,000 610,043 596,875 Blockbuster, Inc. (C) 9.000 09/01/12 275,000 276,208 254,375 Cablevision Systems Corporation 8.000 04/15/12 500,000 506,325 493,750 Chesapeake Energy Corporation 7.000 08/15/14 650,000 672,973 645,125 Cincinnati Bell, Inc. 8.375 01/15/14 550,000 503,750 555,500 Clayton Williams Energy, Inc. 7.750 08/01/13 575,000 557,000 529,000 Del Monte Corporation 8.625 12/15/12 200,000 200,000 206,500 Dynegy Holdings, Inc. 8.375 05/01/16 665,000 676,303 650,038 Edison Mission Energy 7.750 06/15/16 35,000 35,000 34,825 Electronic Data Systems Corporation 7.125 10/15/09 500,000 503,257 514,573 Esterline Technologies 7.750 06/15/13 175,000 175,000 176,750 Exco Resources, Inc. 7.250 01/15/11 500,000 488,750 497,500 Ford Motor Credit Co. 7.375 10/28/09 750,000 748,125 744,492 Ford Motor Credit Co. 8.000 12/15/16 150,000 147,483 143,274 Freeport-McMoran Copper & Gold 8.375 04/01/17 190,000 190,000 202,825 Gencorp, Inc. 9.500 08/15/13 130,000 130,000 139,100 General Motors Acceptance Corporation 5.850 01/14/09 750,000 741,838 739,153 Goodyear Tire & Rubber Co. 7.857 08/15/11 350,000 327,250 357,000 Goodyear Tire & Rubber Co. 9.000 07/01/15 64,000 65,259 68,960 GulfMark Offshore, Inc. 7.750 07/15/14 300,000 298,725 303,000 Idearc, Inc. 8.000 11/15/16 300,000 300,000 303,000 Inergy LP 8.250 03/01/16 75,000 75,000 77,063 Interline Brands, Inc. 8.125 06/15/14 150,000 148,925 151,125 Iron Mountain, Inc. 8.750 07/15/18 500,000 515,246 515,000 K 2, Inc. 7.375 07/01/14 150,000 150,501 157,875 Koppers, Inc. 9.875 10/15/13 170,000 170,000 181,475 Lazard LLC 7.125 05/15/15 375,000 374,704 386,822 Leucadia National Corporation 7.000 08/15/13 350,000 355,575 343,000 Liberty Media Corporation 5.700 05/15/13 500,000 475,805 469,958 Mac-Gray Corporation 7.625 08/15/15 300,000 300,000 301,500 Majestic Star Casino LLC 9.500 10/15/10 250,000 250,000 260,000 Manitowoc Company, Inc. 7.125 11/01/13 100,000 100,000 100,250 Mariner Energy, Inc. 8.000 05/15/17 400,000 402,714 397,000 Markwest Energy Operating Co. 6.875 11/01/14 550,000 532,750 519,750 Mediacom Broadband LLC 8.500 10/15/15 750,000 766,319 753,750 Metaldyne Corporation (C) 10.000 11/01/13 340,000 341,782 360,400 N R G Energy, Inc. 7.375 02/01/16 600,000 598,750 601,500 N T L Cable PLC 9.125 08/15/16 690,000 709,621 722,775 Nalco Co. 7.750 11/15/11 250,000 250,000 251,875 Neiman Marcus Group, Inc. 10.375 10/15/15 600,000 600,000 660,000 Nextel Communications, Inc. 7.375 08/01/15 400,000 408,268 399,828 North American Energy Partners 8.750 12/01/11 200,000 200,000 202,000 NOVA Chemicals Corporation (C) 8.484 11/15/13 215,000 215,000 215,000 O E D Corp/Diamond Jo Company Guarantee 8.750 04/15/12 500,000 492,980 500,000 Offshore Logistics, Inc. 6.125 06/15/13 350,000 350,000 329,875 P Q Corporation 7.500 02/15/13 685,000 677,350 726,100 Pacific Energy Partners 7.125 06/15/14 250,000 251,763 258,655 Pacific Energy Partners 6.250 09/15/15 100,000 99,544 98,233 Petrohawk Energy Corporation 9.125 07/15/13 500,000 498,860 528,750 Pliant Corporation (C) 11.850 06/15/09 681,101 686,165 732,184 Primedia, Inc. 8.000 05/15/13 500,000 513,575 526,250 Quicksilver Resources, Inc. 7.125 04/01/16 600,000 583,125 579,000 R H Donnelley, Inc. 8.875 01/15/16 325,000 346,114 338,000 Rent-A-Center, Inc. 7.500 05/01/10 250,000 250,000 253,750 Rock-Tenn Co. 8.200 08/15/11 80,000 80,473 82,400 Rogers Wireless, Inc. 7.500 03/15/15 560,000 596,731 599,877 Sheridan Acquisition Corporation 10.250 08/15/11 225,000 222,001 236,250 --------------------------------------------------------------------------------------------------------------------------------- 24 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Shares or Interest Due Principal CORPORATE PUBLIC SECURITIES:(A)(Continued) Rate Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ BONDS, CONTINUED Sierra Pacific Resources 6.750% 08/15/17 $ 330,000 $ 331,525 $ 324,410 Tekni-Plex, Inc. 12.750 06/15/10 500,000 483,500 445,000 Tenet Healthcare Corporation 6.375 12/01/11 250,000 241,250 228,438 Tenet Healthcare Corporation 9.875 07/01/14 350,000 341,859 346,500 Tenneco, Inc. 8.625 11/15/14 500,000 501,240 515,000 Tennessee Gas Pipeline Co. 7.000 03/15/27 250,000 261,753 257,189 Texas Industries, Inc. 7.250 07/15/13 35,000 35,000 35,088 Titan International, Inc. 8.000 01/15/12 70,000 70,000 71,925 Triton P C S, Inc. 8.500 06/01/13 500,000 500,000 511,250 Unisys Corporation 8.000 10/15/12 90,000 90,000 87,525 United Components, Inc. 9.375 06/15/13 535,000 536,130 552,384 United Rentals, Inc. 7.750 11/15/13 325,000 325,000 325,406 Universal City Florida (C) 10.106 05/01/10 100,000 100,000 102,000 Universal City Florida 8.375 05/01/10 100,000 100,000 102,250 Vought Aircraft Industries 8.000 07/15/11 650,000 648,511 646,750 Warner Music Group Corporation 7.375 04/15/14 125,000 125,000 116,250 ------------ ------------ TOTAL BONDS $ 27,809,160 $ 28,001,875 ------------ ------------ COMMON STOCK - 0.70% Distributed Energy Systems Corporation (B) 14,000 $ 177,078 $ 18,200 EnerNOC, Inc. (B) 23,500 648,410 896,055 ------------ ------------ TOTAL COMMON STOCK 825,488 914,255 ------------ ------------ CONVERTIBLE BONDS - 0.20% Citadel Broadcasting Corporation 1.875% 02/15/11 $ 300,000 $ 232,875 $ 258,000 ------------ ------------ TOTAL CONVERTIBLE BONDS 232,875 258,000 ------------ ------------ TOTAL CORPORATE PUBLIC SECURITIES $ 28,867,523 $ 29,174,130 ------------ ------------ Interest Due Principal SHORT-TERM SECURITIES: Rate/Yield* Date Amount Cost Market Value ------- -------- ------------ ------------ ------------ COMMERCIAL PAPER - 4.24% Lennar Corporation 5.455% 07/05/07 $ 1,816,000 $ 1,814,625 $ 1,814,625 Walt Disney Co. 5.424 07/03/07 1,259,000 1,258,431 1,258,431 Wellpoint, Inc. 5.414 07/02/07 2,450,000 2,449,264 2,449,264 ------------ ------------ TOTAL SHORT-TERM SECURITIES $ 5,522,320 $ 5,522,320 ------------ ------------ TOTAL INVESTMENTS 106.51% $138,801,167 $138,659,319 ============ ------------ Other Assets 3.70 4,813,765 Liabilities (10.21) (13,288,487) ------ ------------ TOTAL NET ASSETS 100.00% $130,184,597 ====== ============ (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 06/30/07. (D) Defaulted security; interest not accrued. * Effective yield at purchase. --------------------------------------------------------------------------------------------------------------------------------- 25 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value ------------ ------------ AEROSPACE - 3.88% BUILDINGS & REAL ESTATE - 1.58% Consolidated Foundries Holdings $ 1,641,659 K W P I Holdings Corporation $ 1,314,373 Esterline Technologies 176,750 Texas Industries, Inc. 35,088 Gencorp, Inc. 139,100 TruStile Doors, Inc. 713,488 P A S Holdco LLC 1,415,364 ------------ Transdigm, Inc. 151,500 2,062,949 Visioneering, Inc. 883,876 ------------ Vought Aircraft Industries 646,750 CHEMICAL, PLASTICS & RUBBER - 1.23% ------------ Capital Specialty Plastics, Inc. 223,573 5,054,999 Koppers, Inc. 181,475 ------------ Nalco Co. 251,875 AUTOMOBILE - 8.35% NOVA Chemicals Corporation 215,000 Ford Motor Credit Co. 887,766 P Q Corporation 726,100 Fuel Systems Holding Corporation 1,454,394 ------------ General Motors Acceptance Corporation 739,153 1,598,023 Goodyear Tire & Rubber Co. 425,960 ------------ Jason, Inc. 896,130 CONSUMER PRODUCTS - 9.30% LIH Investors, L.P. -- Aero Holdings, Inc. 1,744,139 Metaldyne Corporation 360,400 Augusta Sportswear Holding Co. 1,720,017 Nyloncraft, Inc. 869,644 Bravo Sports Holding Corporation 1,291,563 Ontario Drive & Gear Ltd. 1,494,326 G F S I, Inc. 386,250 Qualis Automotive LLC 1,057,844 K N B Holdings Corporation 1,342,831 Tenneco, Inc. 515,000 Momentum Holding Co. 669,096 Titan International, Inc. 71,925 R A J Manufacturing Holdings LLC 1,360,428 Transtar Holding Company 1,547,057 Royal Baths Manufacturing Company 658,948 United Components, Inc. 552,384 The Tranzonic Companies 1,541,402 ------------ Walls Industries, Inc. 1,393,692 10,871,983 Winsloew Furniture, Inc. -- ------------ ------------ BEVERAGE, DRUG & FOOD - 3.49% 12,108,366 Aramark Corporation 203,000 ------------ Beta Brands Ltd. -- CONTAINERS, PACKAGING & GLASS - 5.60% Del Monte Corporation 206,500 Flutes, Inc. 894,495 Eagle Pack Pet Foods, Inc. 865,136 Maverick Acquisition Company 573,996 Nonni's Food Company 1,308,137 P I I Holding Corporation 1,446,055 River Ranch Fresh Foods LLC 780,000 Packaging Dynamics Corporation of America 854,250 Specialty Foods Group, Inc. -- Paradigm Packaging, Inc. 1,344,684 Vitality Foodservice, Inc. 1,179,474 Pliant Corporation 732,184 ------------ Tekni-Plex, Inc. 445,000 4,542,247 Vitex Packaging Group, Inc. 994,101 ------------ ------------ BROADCASTING & ENTERTAINMENT - 2.22% 7,284,765 Cablevision Systems Corporation 493,750 ------------ Charter Communications Op LLC 253,125 DISTRIBUTION - 3.80% Citadel Broadcasting Corporation 258,000 Duncan Systems, Inc. 887,235 Liberty Media Corporation 469,958 Kele and Associates, Inc. 1,298,590 Mediacom Broadband LLC 753,750 Magnatech International, Inc. 1,213,605 Workplace Media Holdings Co. 655,321 O R S Nasco Holding, Inc. 1,549,634 ------------ QualServ Corporation -- 2,883,904 Strategic Equipment & Supply Corporation, Inc. -- ------------ ------------ 4,949,064 ------------ ---------------------------------------------------------------------------------------------------------------------------------- 26 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value ------------ ------------ DIVERSIFIED/CONGLOMERATE, HEALTHCARE, EDUCATION & MANUFACTURING - 7.23% CHILDCARE - 4.46% Arrow Tru-Line Holdings, Inc. $ 1,036,685 A T I Acquisition Company $ 1,164,076 Bombardier, Inc. 475,000 American Hospice Management Holding LLC 1,372,661 Coining Corporation of America LLC 1,478,611 Community Health Systems 456,188 Dexter Magnetics Technologies, Inc. 1,359,059 F H S Holdings LLC 1,403,203 Douglas Dynamics LLC 308,750 H C A, Inc. 532,500 Evans Consoles, Inc. -- MedAssist, Inc. 306,503 Postle Aluminum Company LLC 1,343,206 Tenet Healthcare Corporation 574,938 Radiac Abrasives, Inc. 1,371,281 ------------ Truck Bodies & Equipment International 2,034,230 5,810,069 ------------ ------------ 9,406,822 HOME & OFFICE FURNISHINGS, ------------ HOUSEWARES, AND DURABLE DIVERSIFIED/CONGLOMERATE, CONSUMER PRODUCTS - 6.75% SERVICE - 3.26% Connor Sport Court International, Inc. 529,709 Allied Waste NA 505,625 H M Holding Company 1,218,449 CapeSuccess LLC 2,512 Home Decor Holding Company 1,277,480 Diversco, Inc./DHI Holdings, Inc. -- Justrite Manufacturing Acquisition Co. 954,816 Dwyer Group, Inc. 557,965 Monessen Holding Corporation 1,271,616 Fowler Holding, Inc. 1,306,768 Stanton Carpet Holding Co. 1,322,892 Interline Brands, Inc. 151,125 U-Line Corporation 1,236,312 Iron Mountain, Inc. 515,000 Wellborn Forest Holding Co. 977,262 Mac-Gray Corporation 301,500 ------------ Mail Communications Group, Inc. 650,885 8,788,536 Moss, Inc. 246,456 ------------ ------------ LEISURE, AMUSEMENT, 4,237,836 ENTERTAINMENT - 4.51% ------------ Electra Bicycle Company, Inc. 899,131 ELECTRONICS - 2.79% K 2, Inc. 157,875 Connecticut Electric, Inc. 1,371,745 Keepsake Quilting, Inc. 852,090 Directed Electronics, Inc. 1,724,842 Majestic Star Casino LLC 260,000 Distributed Energy Systems Corporation 18,200 O E D Corp/Diamond Jo Company Guarantee 500,000 Electronic Data Systems Corporation 514,573 Overton's Holding Company 998,416 ------------ Savage Sports Holding, Inc. 1,364,482 3,629,360 Tunica-Biloxi Gaming Authority 522,500 ------------ Universal City Florida 204,250 FARMING & AGRICULTURE - 0.00% Warner Music Group Corporation 116,250 Protein Genetics, Inc. -- ------------ ------------ 5,874,994 FINANCIAL SERVICES - 0.56% ------------ Highgate Capital LLC -- MACHINERY - 9.65% Lazard LLC 386,822 Davis-Standard LLC 1,339,423 Leucadia National Corporation 343,000 Integration Technology Systems, Inc. 474,502 Victory Ventures LLC -- Manitowoc Company, Inc. 100,250 ------------ Maxon Corporation 2,290,802 729,822 Morton Industrial Group, Inc. 1,297,881 ------------ Navis Global 1,427,947 NetShape Technologies, Inc. 1,295,058 Pacific Consolidated Holdings LLC 712,634 Safety Speed Cut Manufacturing Company, Inc. 662,596 Stewart & Stevenson LLC 783,750 Synventive Equity LLC 17,714 Tronair, Inc. 2,155,795 ------------ 12,558,352 ------------ ---------------------------------------------------------------------------------------------------------------------------------- 27 CONSOLIDATED SCHEDULE OF INVESTMENTS(CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2007 (Unaudited) Fair Value/ Fair Value/ INDUSTRY CLASSIFICATION: Market Value Market Value ------------ ------------ MEDICAL DEVICES/BIOTECH - 2.66% RETAIL STORES - 2.83% Coeur, Inc. $ 784,558 Blockbuster, Inc. $ 254,375 E X C Acquisition Corporation 83,546 Neiman Marcus Group, Inc. 660,000 MicroGroup, Inc. 1,712,292 Olympic Sales, Inc. 1,687,954 OakRiver Technology, Inc. 878,531 Rent-A-Center, Inc. 253,750 ------------ Rental Service Corporation 510,000 3,458,927 United Rentals, Inc. 325,406 ------------ ------------ MINING, STEEL, IRON & NON PRECIOUS 3,691,485 METALS - 0.84% ------------ Freeport-McMoran Copper & Gold 202,825 TECHNOLOGY - 0.76% Steel Dynamics, Inc. 97,250 EnerNOC, Inc. 896,055 Tube City IMS Corporation 328,000 Unisys Corporation 87,525 U S S Holdings, Inc. 466,871 ------------ ------------ 983,580 1,094,946 ------------ ------------ TELECOMMUNICATIONS - 3.46% NATURAL RESOURCES - 0.26% Cincinnati Bell, Inc. 555,500 Appleton Papers, Inc. 257,500 DeltaCom 1,720,115 Rock-Tenn Co. 82,400 Nextel Communications, Inc. 399,828 ------------ N T L Cable PLC 722,775 339,900 Rogers Wireless, Inc. 599,877 ------------ Triton P C S, Inc. 511,250 OIL AND GAS - 4.71% ------------ Atlas Pipeline Partners 598,500 4,509,345 Basic Energy Services 596,875 ------------ Bristow Group, Inc. 75,188 TRANSPORTATION - 1.85% Chesapeake Energy Corporation 645,125 NABCO, Inc. 639,544 Clayton Williams Energy, Inc. 529,000 Tangent Rail Corporation 1,768,324 Exco Resources, Inc. 497,500 ------------ GulfMark Offshore, Inc. 303,000 2,407,868 Mariner Energy, Inc. 397,000 ------------ North American Energy Partners 202,000 UTILITIES - 2.51% Offshore Logistics, Inc. 329,875 Dynegy Holdings, Inc. 650,038 Quicksilver Resources, Inc. 579,000 Edison Mission Energy 34,825 Tennessee Gas Pipeline Co. 257,189 Inergy LP 77,063 Tesoro Petroleum Corporation 244,375 Markwest Energy Operating Co. 519,750 Total Equipment & Service, Inc. 876,771 N R G Energy, Inc. 601,500 ------------ Pacific Energy Partners 356,888 6,131,398 Petrohawk Energy Corporation 528,750 ------------ Sierra Pacific Resources 324,410 PHARMACEUTICALS - 1.11% Tenaska Alabama Partners LP 180,201 CorePharma LLC 1,387,980 ------------ Enzymatic Therapy, Inc. 56,250 3,273,425 ------------ ------------ 1,444,230 WASTE MANAGEMENT/ ------------ POLLUTION - 1.24% PUBLISHING/PRINTING - 1.38% Terra Renewal Services, Inc. 1,616,304 Idearc, Inc. 303,000 ------------ Primedia, Inc. 526,250 TOTAL CORPORATE RESTRICTED AND R H Donnelley, Inc. 338,000 PUBLIC SECURITIES - 102.27% $133,136,999 Sheridan Acquisition Corporation 236,250 ============ Valassis Communications, Inc. 390,000 ------------ 1,793,500 ------------ ---------------------------------------------------------------------------------------------------------------------------------- 28 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (Unaudited) 1. HISTORY MassMutual Participation Investors (the "Trust") was organized as a Massachusetts business trust under the laws of the Commonwealth of Massachusetts pursuant to a Declaration of Trust dated April 7, 1988. The Trust is a diversified closed-end management investment company. Babson Capital Management LLC ("Babson Capital"), a wholly-owned indirect subsidiary of Massachusetts Mutual Life Insurance Company ("MassMutual"), acts as its investment adviser. The Trust's investment objective is to maximize total return by providing a high level of current income, the potential for growth of such income, and capital appreciation, by investing primarily in a portfolio of privately placed, below investment grade, long-term corporate debt obligations purchased directly from their issuers, at least half of which normally will include equity features. On January 27, 1998, the Board of Trustees authorized the formation of a wholly owned subsidiary of the Trust ("MMPI Subsidiary Trust") for the purpose of holding certain investments. The results of the MMPI Subsidiary Trust are consolidated in the accompanying financial statements. Footnote 2.D below discusses the federal tax consequences of the MMPI Subsidiary Trust. 2. SIGNIFICANT ACCOUNTING POLICIES The following is a summary of significant accounting policies followed consistently by the Trust in the preparation of its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America. A. VALUATION OF INVESTMENTS: Valuation of a security in the Trust's portfolio is made on the basis of market price whenever market quotations are readily available and all securities of the same class held by the Trust can be readily sold in such market. Nearly all securities which are acquired by the Trust directly from the issuers and shares into which such securities may be converted or which may be purchased on the exercise of warrants attached to such securities will be subject to legal or contractual delays in, or restrictions on, resale and will therefore be "restricted securities." Generally speaking, as contrasted with open-market sales of unrestricted securities, which may be effected immediately if the market is adequate, restricted securities can be sold only in a public offering for which a registration statement is in effect under the Securities Act of 1933, as amended (the "1933 Act") or pursuant to a transaction that is exempt from registration under the 1933 Act. The value of restricted securities, and of any other assets for which there are no reliable market quotations, is the fair value as determined in good faith by the Trust's Board of Trustees (the "Trustees"). Each restricted security is valued by the Trustees as of the time of its acquisition and at least quarterly thereafter. The Trustees have established guidelines to aid in the valuation of each security. Generally, restricted securities are initially valued at cost or less at the time of acquisition by the Trust. Values greater or less than cost are used thereafter for restricted securities in appropriate circumstances. Among the factors ordinarily considered are the existence of restrictions upon the sale of a security held by the Trust; an estimate of the existence and the extent of a market for the security; the extent of any discount at which the security was acquired; the estimated period of time during which the security will not be freely marketable; the estimated expenses of registering or otherwise qualifying the security for public sale; estimated underwriting commissions if underwriting would be required to effect a sale; in the case of a convertible security, whether or not it would trade on the basis of its stock equivalent; in the case of a debt obligation which would trade independently of any equity equivalent, the current yields on comparable securities; the estimated amount of the floating supply of such securities available for purchase; the proportion of the issue held by the Trust; changes in the financial condition and prospects of the issuer; the existence of merger proposals or tender offers affecting the issuer; and any other factors affecting fair value, all in accordance with the Investment Company Act of 1940, as amended (the "1940 Act"). In making valuations, opinions of counsel may be relied upon as to whether or not securities are restricted securities and as to the legal requirements for public sale. When market quotations are readily available for unrestricted securities of an issuer, restricted securities of the same class are generally valued at a discount from the market price of such unrestricted securities. The Trustees, however, consider all factors in fixing any discount, including the filing of a registration statement for such securities under the 1933 Act and any other developments which are likely to increase the probability that the securities may be publicly sold by the Trust without restriction. The Trustees meet at least once in each quarter to approve the value of the Trust's portfolio securities as of the close of business on the last business day of the preceding quarter. This valuation requires the approval of a majority of the Trustees of the Trust, including a majority of the Trustees who are not interested persons of the Trust or of Babson Capital. In making valuations, the Trustees will consider reports by Babson Capital analyzing each portfolio security in accordance with the relevant factors referred to above. Babson -------------------------------------------------------------------------------- 29 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) Capital has agreed to provide such reports to the Trust at least quarterly. The consolidated financial statements include private placement restricted securities valued at $97,211,042 (74.67% of net assets) as of June 30, 2007 whose values have been estimated by the Trustees in the absence of readily ascertainable market values. Due to the inherent uncertainty of valuation, those estimated values may differ significantly from the values that would have been used had a ready market for the securities existed, and the differences could be material. The values for Rule 144A restricted securities and corporate public securities are stated at the last reported sales price or at prices based upon quotations obtained from brokers and dealers as of June 30, 2007, subject to discount where appropriate, and are approved by the Trustees. Short-term securities with more than sixty days to maturity are valued at fair value and short-term securities having a maturity of sixty days or less are valued at amortized cost, which approximates market value. B. ACCOUNTING FOR INVESTMENTS: Investment transactions are accounted for on the trade date. Dividend income is recorded on the ex-dividend date. Interest income is recorded on the accrual basis, including the amortization of premiums and accretion of discounts on bonds held using the yield-to-maturity method. The Trust does not accrue income when payment is delinquent and when management believes payment is questionable. Realized gains and losses on investment transactions and unrealized appreciation and depreciation of investments are reported for financial statement and federal income tax purposes on the identified cost method. C. USE OF ESTIMATES: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. D. FEDERAL INCOME TAXES: The Trust has elected to be taxed as a "regulated investment company" under the Internal Revenue Code, and intends to maintain this qualification and to distribute substantially all of its net taxable income to its shareholders. In any year when net long-term capital gains are realized by the Trust, management, after evaluating the prevailing economic conditions, will recommend that Trustees either designate the net realized long-term gains as undistributed and pay the federal capital gains taxes thereon, or distribute all or a portion of such net gains. The Trust is taxed as a regulated investment company and is therefore limited as to the amount of non-qualified income that it may receive as the result of operating a trade or business, e.g. the Trust's pro rata share of income allocable to the Trust by a partnership operating company. The Trust's violation of this limitation could result in the loss of its status as a regulated investment company, thereby subjecting all of its net income and capital gains to corporate taxes prior to distribution to its shareholders. The Trust, from time-to-time, identifies investment opportunities in the securities of entities that could cause such trade or business income to be allocable to the Trust. The MMPI Subsidiary Trust (described in Footnote 1, above) was formed in order to allow investment in such securities without adversely affecting the Trust's status as a regulated investment company. The MMPI Subsidiary Trust is not taxed as a regulated investment company. Accordingly, prior to the Trust's receiving any distributions from the MMPI Subsidiary Trust, all of the MMPI Subsidiary Trust's taxable income and realized gains, including non-qualified income and realized gains, is subject to taxation at prevailing corporate tax rates. For the six months ended June 30, 2007, the MMPI Subsidiary Trust has accrued income tax expense of $62,851 on net realized gains and decreased accrued deferred tax income expenses on net unrealized gains by $199,273. In, June 2006, the Financial Accounting Standards Board ("FASB") issued FASB Interpretation No. 48, Accounting for Uncertainly in Income Taxes - an interpretation of FASB Statement No. 109 ("FIN 48"). FIN 48 supplements FASB 109 by prescribing a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The adoption of FIN 48 requires financial statements to be adjusted to reflect only those tax positions that are more likely than not to be sustained as of the adoption date. As of June 30, 2007, the Trust has properly recorded all tax liabilities. E. DISTRIBUTIONS TO SHAREHOLDERS: The Trust records distributions to shareholders from net investment income and net realized gains, if any, on the exdividend date. The Trust's net investment income dividend is declared four times per year, in April, July, October and December. The Trust's net realized capital gain distribution, if any, is declared in December. 30 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) F. EXPENSE REDUCTION: Citibank, N.A. ("Citibank") serves as custodian to the Trust. Pursuant to the custodian agreement, Citibank receives a fee reduced by credits on cash balances the Trust maintains with Citibank. All credit balances, if any, used to reduce the Trust's custodian fees are reported as fees paid indirectly on the Statement of Operations. For the six months ended June 30, 2007, there were no credit balances used to reduce custodian fees. 3. INVESTMENT ADVISORY AND ADMINISTRATIVE SERVICES FEE A. SERVICES: Under an Investment Advisory and Administrative Services Contract (the "Contract") with the Trust, Babson Capital has agreed to use its best efforts to present to the Trust a continuing and suitable investment program consistent with the investment objectives and policies of the Trust. Babson Capital represents the Trust in any negotiations with issuers, investment banking firms, securities brokers or dealers and other institutions or investors relating to the Trust's investments. Under the Contract, Babson Capital also provides administration of the day-to-day operations of the Trust and provides the Trust with office space and office equipment, accounting and bookkeeping services, and necessary executive, clerical and secretarial personnel for the performance of the foregoing services. B. FEE: For its services under the Contract, Babson Capital is paid a quarterly investment advisory fee equal to .225% of the value of the Trust's net assets as of the last business day of each fiscal quarter, an amount approximately equivalent to .90% on an annual basis. A majority of the Trustees, including a majority of the Trustees who are not interested persons of the Trust or of Babson Capital, approve the valuation of the Trust's net assets as of such day. C. BASIS FOR BOARD RENEWAL OF CONTRACT: At a meeting of the Trustees held on April 27, 2007, the Trustees (including a majority of the Trustees who are not "interested persons" of the Trust or Babson Capital) unanimously approved a one-year continuance of the Contract. Prior to the meeting, the Trustees requested and received from Ropes & Gray LLP, counsel to the Trust, a memorandum describing the Trustees' legal responsibilities in connection with its review and reapproval of the Contract. The Trustees also requested and received from Babson Capital extensive written and oral information regarding other matters including: the principal terms of the Contract; the reasons why Babson Capital was proposing the continuance of the Contract; Babson Capital and its personnel; the Trust's investment performance, including comparative performance information; the nature and quality of the services provided by Babson Capital to the Trust; financial strength of Babson Capital; the fee arrangements between Babson Capital and the Trust; fee and expense information, including comparative fee and expense information; profitability of the advisory arrangement to Babson Capital; and "fallout" benefits to Babson Capital resulting from the Contract. Among other things, the Trustees discussed and considered with management (i) the aforementioned guidance provided by Ropes & Gray LLP and the information provided by Babson Capital prior to the meeting and (ii) the reasons Babson Capital put forth in support of its recommendation that the Trustees approve the continuance of the Contract. These considerations are summarized below. NATURE, EXTENT AND QUALITY OF SERVICES TO BE PROVIDED BY BABSON CAPITAL TO THE TRUST In evaluating the scope and quality of the services provided by Babson Capital to the Trust, the Trustees considered, among other factors: (i) the scope of services required to be provided by Babson Capital under the Contract; (ii) Babson Capital's ability to find and negotiate private placement securities having equity features that are consistent with the stated investment objectives of the Trust; (iii) the experience and quality of Babson Capital's staff; (iv) the strength of Babson Capital's financial condition; (v) the nature of the private placement market compared to public markets (including the fact that finding, analyzing, negotiating and servicing private placement securities is more labor-intensive than buying and selling public securities and the administration of private placement securities is more extensive, expensive, and requires greater time and expertise than a portfolio of only public securities); (vi) the potential advantages afforded to the Trust by its ability to co-invest in negotiated private placements with MassMutual and its affiliates; and (vii) the expansion of the scope of services provided by Babson Capital as a result of recent regulatory and legislative initiatives that have required increased legal, compliance and business attention and diligence. Based on such considerations, the Trustees concluded that, overall, they are satisfied with the nature, extent and quality of services provided by Babson Capital, and expected to be provided in the future, under the renewed Contract. INVESTMENT PERFORMANCE The Trustees also examined the Trust's short-term, intermediate- term, and long-term performance as compared against various benchmark indices presented at the meeting, which showed that the Trust had outperformed such indices for the 1-, 3-, 5- and 10-year periods. In addition, the Trustees considered comparisons of the Trust's performance with the per- -------------------------------------------------------------------------------- 31 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) formance of (i) selected closed-end investment companies and funds that may invest in private placement securities and/or bank loans; (ii) selected business development companies with comparable types of investments; and (iii) investment companies included in the Lipper closed-end bond universe. It was acknowledged that, while such comparisons are helpful in judging performance, they are not directly comparable in terms of types of investments due to the fact that business development companies often report returns based on market value, which is affected by factors other than the performance of the underlying portfolio investments. Based on these considerations and the detailed performance information provided to the Trustees at the regular Board meetings each quarter, the Trustees concluded that the Trust's absolute and relative performance over time have been sufficient to warrant renewal of the Contract. ADVISORY FEE/COST OF SERVICES PROVIDED AND PROFITABILITY/ MANAGER'S "FALL-OUT" BENEFITS In connection with the Trustees' consideration of the advisory fee paid by the Trust to Babson Capital under the Contract, Babson Capital noted that it was unaware of any registered closed-end investment companies that are directly comparable to the Trust in terms of the types of investments and percentages invested in private placement securities (which require more extensive advisory and administrative services than a portfolio of publicly traded securities, as previously discussed) other than MassMutual Corporate Investors, which also is advised by Babson Capital. Under the terms of its Investment Services Contract, MassMutual Corporate Investors is charged a quarterly investment advisory fee of 0.3125% of net asset value as of the end of each quarter, which is approximately equal to 1.25% annually. In considering the fee rate provided in the Contract, the Trustees noted the advisory fee charged by Babson Capital to Tower Square Capital Partners, L.P. and Tower Square Capital Partners II, L.P., both private mezzanine funds also managed by Babson Capital. At the request of the Trustees, Babson Capital provided information concerning the profitability of Babson Capital's advisory relationship with the Trust. The Trustees also considered the non-economic benefits Babson Capital and its affiliates derived from its relationship with the Trust, including the reputational benefits derived from having the Trust listed on the New York Stock Exchange, and the de minimis amount of commissions resulting from the Trust's portfolio transactions used by Babson Capital for third-party soft dollar arrangements (less than $500). The Trustees recognized that Babson Capital should be entitled to earn a reasonable level of profit for services provided to the Trust and, based on their review, concluded that they were satisfied that Babson Capital's historical level of profitability from its relationship with the Trust was not excessive and that the advisory fee structure under the Contract is reasonable. ECONOMIES OF SCALE The Trustees considered the concept of economies of scale and possible advisory fee reductions if the Trust were to grow in assets. Given that the Trust is not continuously offering shares, such growth comes principally from retained net realized gain on investments and dividend reinvestment. The Trustees also examined the breakpoint features of selected competitive funds and noted that the minimum starting point for fee reductions in those funds was at least $200 million whereas the Trust's current net assets are near $130 million. The Trustees concluded that the absence of breakpoints in the fee schedule under the Contract was currently acceptable given the Trust's current size and closed-end fund structure. 4. SENIOR SECURED INDEBTEDNESS A. NOTE PAYABLE: MassMutual holds the Trust's $12,000,000 Senior Fixed Rate Convertible Note (the "Note") issued by the Trust in 1995. The Note, as amended, is due December 13, 2011 and accrues interest at 5.80% per annum. MassMutual, at its option, can convert the principal amount of the Note into common shares. The dollar amount of principal would be converted into an equivalent dollar amount of common shares based upon the average price of the common shares for ten business days prior to the notice of conversion. For the six months ended June 30, 2007, the Trust incurred total interest expense on the Note of $348,000. The Trust may redeem the Note, in whole or in part, at the principal amount proposed to be redeemed together with the accrued and unpaid interest thereon through the redemption date plus a Make Whole Premium. The Make Whole Premium equals the excess of (i) the present value of the scheduled payments of principal and interest which the Trust would have paid but for the proposed redemption, discounted at the rate of interest of U.S. Treasury obligations whose maturity approximates that of the Note plus 0.50% over (ii) the principal of the Note proposed to be redeemed. B. REVOLVING CREDIT AGREEMENT: The Trust entered into a $15,000,000 Revolving Credit Agreement with Bank of America, N.A. (successor in interest to Fleet National Bank) (the "Agent Bank") dated May 29, 1997, which had a stated maturity date of May 31, 2004, (the maturity date was later extended to May 31, 2007 pursuant to the First Amended and Restated Revolving Credit Agreement). On May 31, 2007, the maturity date of this loan was extended to May 30, 2008, and its terms were amended and restated pursuant to the First Amendment to the First Amended and Restated Revolving Credit Agreement (the "Revolver"), between the Trust and the Agent Bank. The Revolver bears interest payable quarterly in arrears at a per annum rate that varies depending upon whether the Trust requests a Base Rate Loan or Eurodollar Base Rate Loan. Interest on Base Rate loans equals the higher of: (i) the annual "Base Rate" as set periodically by the Agent Bank and (ii) the most recent Federal Funds Effective Rate plus .50% per annum. Per annum interest on Eurodollar Base Rate Loans equals .35% plus the British Bankers Association -------------------------------------------------------------------------------- 32 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) LIBOR rate, divided by 1 minus the Eurodollar Reserve Percentage. The Trust also incurs expense on the undrawn portion of the total Revolver at the amended rate of .10% per annum. As of June 30, 2007, there were no outstanding loans against the Revolver. For the six months ended June 30, 2007, the Trust incurred expense on the Revolver of $16,914 related to the undrawn portion. 5. PURCHASES AND SALES OF INVESTMENTS For the six months ended 6/30/2007 Cost of Proceeds from Investments Sales or Acquired Maturities ------------ ------------ Corporate restricted securities $ 13,856,710 $ 9,071,752 Corporate public securities 3,195,990 9,701,191 The aggregate cost of investments is substantially the same for financial reporting and federal income tax purposes as of June 30, 2007. The net unrealized depreciation of investments for financial reporting and federal tax purposes as of June 30, 2007 is $141,848 and consists of $14,526,552 appreciation and $14,668,400 depreciation. Net unrealized depreciation of investments on the Statement of Assets and Liabilities reflects the balance and a deferred tax accrual of $184,953 on net unrealized gains in the MMPI Subsidiary Trust. 6. QUARTERLY RESULTS OF INVESTMENT OPERATIONS MARCH 31, 2007 AMOUNT PER SHARE -------- --------- Investment income $ 3,065,532 Net investment income 2,439,056 $ 0.25 Net realized and unrealized gain on investments (net of taxes) 663,578 0.07 JUNE 30, 2007 AMOUNT PER SHARE -------- --------- Investment income $ 3,689,385 Net investment income 3,111,679 $ 0.32 Net realized and unrealized gain (loss) on investments (net of taxes) (698,739) (0.07) 7. AGGREGATE REMUNERATION PAID TO OFFICERS, TRUSTEES AND THEIR AFFILIATED PERSONS For the six months ended June 30, 2007, the Trust paid its Trustees aggregate remuneration of $68,000. The Trust did not pay any compensation to any of its Trustees who are "interested persons" (as defined by the 1940 Act) of the Trust. The Trust classifies Messers. Crandall and Joyal as "interested Persons" of the Trust. All of the Trust's officers are employees of Babson Capital or MassMutual. Pursuant to the Contract, the Trust does not compensate its officers who are employees of Babson Capital or MassMutual (except for the Chief Compliance Officer of the trust unless assumed by Babson Capital). For the six months ended June 30, 2007, Babson Capital paid the compensation of the Chief Complance Officer of the Trust. Mr. Crandall, one of the Trust's Trustees is an "affiliated person" (as defined by the 1940 Act) of MassMutual and Babson Capital. The Trust did not make any payments to Babson Capital for the six months ended June 30 2007, other than amounts payable to Babson Capital pursuant to the Contract. For the six months ended June 30, 2007, the Trust paid the following amounts to MassMutual, exclusive of interest expense on the Note explained in Footnote 4.A: Preparation of the Trust's Quarterly and Annual Reports to Shareholders $ 6,358 Preparation of Certain of the Trust's Shareholder Communications 1,089 Preparation of the Trust's Annual Proxy Statements 675 ------- $ 8,122 -------------------------------------------------------------------------------- 33 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) 8. RESULTS OF SHAREHOLDER MEETING The Annual Meeting of Shareholders was held on Friday, April 27, 2007. The Shareholders were asked to vote to reelect Donald E. Benson, Donald Glickman and Robert E. Joyal as trustees, each for a three-year term; William J. Barrett as trustee, for a two-year term; and Michael H. Brown as trustee, for a one-year term. The Shareholders approved all of the proposals. The Trust's other trustees (Roger W. Crandall, Martin T. Hart and Corine T. Norgaard) continued to serve their respective terms following the April 27, 2007 Annual Shareholders Meeting. The results of the Shareholders votes are set forth below. % of Shares Shares for Withheld Total Voted for ---------- -------- ----- --------- Donald E. Benson 8,552,191 168,711 8,720,902 98.07% Donald Glickman 8,540,666 180,236 8,720,902 97.93% Robert E. Joyal 8,560,245 160,657 8,720,902 98.16% William J. Barrett 8,571,844 149,058 8,720,902 98.29% Michael H. Brown 8,571,942 148,960 8,720,902 98.29% 9. NEW ACCOUNTING PRONOUNCEMENTS In September 2006, FASB issued Statement of Financial Accounting Standards No. 157, Fair Value Measurements ("FAS 157"). FAS 157 establishes a single authoritative definition of fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. FAS 157 applies to fair value measurements already required or permitted by existing standards. The change to current generally accepted accounting principles from the application of FAS 157 relates to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurements. Management of the Trust does not believe the adoption of FAS 157 will materially impact the financial statement amounts, however, additional disclosures may be required about the inputs used to develop the measurements and the effect of certain of the measurements on changes in net assets for the period. FAS 157 is effective for financial statements issued for fiscal years beginning after November 15, 2007 and interim periods within those fiscal years. -------------------------------------------------------------------------------- 34 TRUSTEES OFFICERS William J. Barrett Roger W. Crandall Chairman Donald E. Benson* Clifford M. Noreen President Michael H. Brown James M. Roy Vice President & Chief Financial Officer Roger W. Crandall Rodney J. Dillman Vice President & Donald Glickman Secretary & Chief Legal Officer Martin T. Hart* Jill A. Fields Vice President Robert E. Joyal Michael P. Hermsen Vice President Corine T. Norgaard* Mary Wilson Kibbe Vice President Michael L. Klofas Vice President Richard E. Spencer, II Vice President * MEMBER OF THE AUDIT Ronald S. Talala Treasurer COMMITTEE John T. Davitt, Jr. Comptroller Melissa M. LaGrant Chief Compliance Officer -------------------------------------------------------------------------------- DIVIDEND REINVESTMENT AND CASH PURCHASE PLAN MassMutual Participation Investors offers a Dividend Reinvestment and Cash Purchase Plan. The Plan provides a simple and automatic way for shareholders to add to their holdings in the Trust through the receipt of dividend shares issued by the Trust or through the reinvestment of cash dividends in Trust shares purchased in the open market. The dividends of each shareholder will be automatically reinvested in the Trust by Shareholder Financial Services Inc., the Transfer Agent, in accordance with the Plan, unless such shareholder elects not to participate by providing written notice to the Transfer Agent. A shareholder may terminate his or her participation by notifying the Transfer Agent in writing. Participating shareholders may also make additional contributions to the Plan from their own funds. Such contributions may be made by personal check or other means in an amount not less than $100 nor more than $5,000 per quarter. Cash contributions must be received by the Transfer Agent at least five days (but no more then 30 days) before the payment date of a dividend or distributions. Whenever the Trust declares a dividend payable in cash or shares, the Transfer Agent, acting on behalf of each participating shareholder, will take the dividend in shares only if the net asset value is lower than the market price plus an estimated brokerage commission as of the close of business on the valuation day. The valuation day is the last day preceding the day of dividend payment. When the dividend is to be taken in shares, the number of shares to be received is determined by dividing the cash dividend by the net asset value as of the close of business on the valuation date or, if greater than net asset value, 95% of the closing share price. If the net asset value of the shares is higher than the market value plus an estimated commission, the Transfer Agent, consistent with obtaining the best price and execution, will buy shares on the open market at current prices promptly after the dividend payment date. The reinvestment of dividends does not, in any way, relieve participating shareholders of any federal, state or local tax. For federal income tax purposes, the amount reportable in respect of a dividend received in newly-issued shares of the Trust will be the fair market value of the shares received, which will be reportable as ordinary income and/or capital gains. As compensation for its services, the Transfer Agent receives a fee of 5% of any dividend and cash contribution (in no event in excess of $2.50 per distribution per shareholder.) Any questions regarding the Plan should be addressed to Shareholder Financial Services, Inc., Agent for MassMutual Participation Investors' Dividend Reinvestment and Cash Purchase Plan, P.O. Box 173673, Denver CO 80217-3673. MassMutual Participation Investors DB1040 707 ITEM 2. CODE OF ETHICS. Not applicable for this filing. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. Not applicable for this filing. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. Not applicable for this filing. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. Not applicable for this filing. ITEM 6. SCHEDULE OF INVESTMENTS A schedule of investments for the Registrant is included as part of this report to shareholders under item 1 of this Form N-CSR. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED END MANAGEMENT INVESTMENT COMPANIES. Not applicable for this filing. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable for this filing. There have been no changes in any of the Portfolio Managers identified in the Registrant's most recent annual report on Form N-CSR. ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS. Not Applicable for this filing. ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS. Not Applicable for this filing. ITEM 11. 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-CSR 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) during the Registrant's second fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting. ITEM 12. EXHIBITS. (a)(1) ANY CODE OF ETHICS, OR AMENDMENTS THERETO, THAT IS THE SUBJECT OF DISCLOSURE REQUIRED BY ITEM 2, TO THE EXTENT THAT THE REGISTRANT INTENDS TO SATISFY THE ITEM 2 REQUIREMENTS THROUGH THE FILING OF AN EXHIBIT. None. (a)(2) A SEPARATE CERTIFICATION FOR EACH PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER OF THE REGISTRANT AS REQUIRED BY RULE 30a-2 UNDER THE ACT. Attached hereto as EX-99.31.1 Attached hereto as EX-99.31.2 (a)(3) ANY WRITTEN SOLICITATION TO PURCHASE SECURITIES UNDER RULE 23c-1 UNDER THE ACT (17 CFR 270.23c-1) SENT OR GIVEN DURING THE PERIOD COVERED BY THE REPORT BY OR ON BEHALF OF THE REGISTRANT TO 10 OR MORE PERSONS. Not Applicable for this filing. (b) If the report is filed under Section 13(a) or 15(d) of the Exchange Act, provide the certifications required by Rule 30a-2(b) under the Act (17 CFR 270.30a-2(b)), Rule 13a-14(b) or Rule 15d-14(b) under the Exchange Act (17 CFR 240.13a-14(b) or 240.15d-14(b)), and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as an exhibit. A certification furnished pursuant to this paragraph will not be deemed "filed" for purposes of Section 18 of the Exchange Act (15 U.S.C. 78r), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference. Attached hereto as EX-99.32 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: /s/ Clifford M Noreen ---------------------------------- Clifford M Noreen, President ---------------------------------- Date: September 4, 2007 ---------------------------------- Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated. By: /s/ Clifford M Noreen ---------------------------------- Clifford M Noreen, President ---------------------------------- Date: September 4, 2007 ---------------------------------- By: /s/ James M. Roy ---------------------------------- James M. Roy, Vice President, and Chief Financial Officer ---------------------------------- Date: September 4, 2007 ----------------------------------