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, P.O. Box 15189, Springfield, MA 01115-5189 -------------------------------------------------------------------------------- (Address of principal executive offices) (Zip code) Rodney J. Dillman, Vice President and Secretary 1500 Main Street, Suite 2800, P.O. Box 15189, 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: 12/31/06 ------------------ 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 annual shareholder report transmitted to shareholders pursuant to Rule 30e-1 of the Investment Company Act of 1940, as amended. [PHOTO] [LOGO] MASSMUTUAL PARTICIPATION INVESTORS 2006 ANNUAL REPORT MassMutual Participation Investors -------------------------------------------------------------------------------- MASSMUTUAL PARTICIPATION INVESTORS c/o Babson Capital Management LLC 1500 Main Street, Suite 600 Springfield, Massachusetts 01115 (413) 226-1516 http://www.babsoncapital.com/mpv ADVISER Babson Capital Management LLC 1500 Main Street Springfield, Massachusetts 01115 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 MPV LISTED NYSE [BACKGROUND PHOTO] PROXY VOTING POLICIES & PROCEDURES; PROXY VOTING RECORD The Trustees of MassMutual Participation Investors have delegated proxy voting responsibilities relating to the voting of securities held by the Trust to Babson Capital Management LLC. 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 MassMutual Participation Investors' website: http://www. babsoncapital.com/mpv; and (3) on the U.S. Securities and Exchange Commission ("SEC") website at 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 MassMutual Participation Investors' website: http://www.babsoncapital.com/mpv; and (2) on the SEC's website at http://www.sec.gov. FORM N-Q MassMutual Participation Investors files its complete schedule of portfolio holdings with the 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. Or visiting www.babsoncapital.com/mpv. MASSMUTUAL PARTICIPATION INVESTORS MassMutual Participation Investors is a closed-end investment company, first offered to the public in 1988, whose shares are traded on the New York Stock Exchange. MassMutual Participation Investors -------------------------------------------------------------------------------- INVESTMENT OBJECTIVE & POLICY MassMutual Participation Investors (the "Trust") is a closed-end 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 either the New York Stock Exchange listings or Closed-End Fund 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, which tend to be smaller companies. At least half of these investments normally include equity features such as 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 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. In this report you will find a complete listing of the Trust's holdings. We encourage you to read this section carefully for a better understanding of the Trust. We cordially invite all shareholders to attend the Trust's Annual Meeting of Shareholders, which will be held on April 27, 2007 at 1:00 P.M. in Springfield, Massachusetts. [BACKGROUND PHOTO] PORTFOLIO COMPOSITION AS OF 12/31/06* [PIE CHART APPEARS HERE] Private High Yield Debt 47.2% Private/Restricted Equity 16.0% Cash & Short Term Investments 6.6% Public High Yield Debt 23.9% Public Equity 0.5% Private Investment Grade Debt 5.8% *BASED ON VALUE OF TOTAL INVESTMENTS (INCLUDING CASH) 1 MassMutual Participation Investors -------------------------------------------------------------------------------- [BACKGROUND PHOTO] TO OUR SHAREHOLDERS I am pleased to share with you the Trust's Annual Report for the year ended December 31, 2006. THE TRUST'S 2006 PORTFOLIO PERFORMANCE The Trust's net total portfolio rate of return for 2006 was 18.64%, as measured by the change in net asset value, assuming the reinvestment of all dividends and distributions. The Trust's total net assets were $126,515,013, or $12.90 per share, as of December 31, 2006 compared to $119,018,966, or $12.21 per share, as of December 31, 2005. The Trust paid a quarterly dividend of 24 cents per share each quarter in 2006, with the fourth quarter dividend paid in January 2007. In addition, the Trust declared a special year-end dividend of 23 cents per share, paid in January 2007 to shareholders of record on December 29, 2006, bringing total dividends for the year to $1.19. All in all, we are very pleased with the Trust's 2006 portfolio performance. [PHOTO OF OFFICERS] LEFT TO RIGHT: Clifford M. Noreen PRESIDENT Roger W. Crandall CHAIRMAN 2 MassMutual Participation Investors -------------------------------------------------------------------------------- TOTAL ANNUAL PORTFOLIO RETURN (AS OF 12/31 EACH YEAR)* [BAR CHART APPEARS HERE] 24.10 10.91 4.77 8.11 3.41 5.70 23.72 25.14 22.51 18.64 MASSMUTUAL PARTICIPATION INVESTORS (BASED ON CHANGE IN THE NET ASSET VALUE WITH REINVESTED DIVIDENDS) 31.04 33.77 25.89 -16.26 -11.67 -23.51 28.34 10.20 3.98 14.79 STANDARD & POOR'S INDUSTRIALS COMPOSITE (FORMERLY CALLED THE STANDARD & POOR'S INDUSTRIAL PRICE INDEX) 8.36 8.29 0.16 9.46 9.77 10.14 6.91 4.08 1.42 4.49 LEHMAN BROTHERS INTERMEDIATE U.S. CREDIT INDEX (FORMERLY CALLED THE LEHMAN BROTHERS INTERMEDIATE CORPORATE BOND INDEX) 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 *DATA FOR MASSMUTUAL PARTICIPATION INVESTORS (THE "TRUST") 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 MARKET VALUE DUE TO THE DIFFERENCE BETWEEN THE TRUST'S NET ASSET VALUE AND THE MARKET VALUE OF ITS SHARES OUTSTANDING (SEE PAGE 12 FOR TOTAL INVESTMENT RETURN BASED ON MARKET VALUE); PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. [PHOTO OF OFFICERS] LEFT TO RIGHT: James M. Roy VICE PRESIDENT & CHIEF FINANCIAL OFFICER Rodney J. Dillman VICE PRESIDENT, SECRETARY & CHIEF LEGAL OFFICER 3 MassMutual Participation Investors -------------------------------------------------------------------------------- The table shown below lists the average annual returns of the Trust's portfolio, based on the change in net assets, assuming the reinvestment of all dividends and distributions, compared to the average annual returns of selected equity and fixed income market indices for the 1, 3, 5 and 10 years ended December 31, 2006. The U.S. economy and investment markets started the year slowly amid lukewarm expectations due to concerns over inflation and the housing market, yet 2006 concluded with some very strong performance, especially in the equity markets. A key date was June 29th, when the Federal Reserve Board completed its fourth and final quarter-point interest rate increase for the year (and 17th since mid-2004). LEHMAN LEHMAN STANDARD BROTHERS BROTHERS & POOR'S THE U.S. CORPORATE INTERMEDIATE INDUSTRIALS RUSSELL TRUST HIGH YIELD INDEX U.S. CREDIT INDEX* COMPOSITE** 2000 INDEX 1 Year 18.64% 11.85% 4.49% 14.79% 18.37% 3 Year 22.07% 8.49% 3.32% 9.57% 13.56% 5 Year 18.92% 10.18% 5.37% 5.25% 11.39% 10 Year 14.39% 6.59% 6.25% 7.72% 9.44% PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. *FORMERLY CALLED THE LEHMAN BROTHERS INTERMEDIATE CORPORATE BOND INDEX. **FORMERLY CALLED THE STANDARD & POOR'S INDUSTRIAL PRICE INDEX. LEFT TO RIGHT: Jill A. Fields VICE PRESIDENT Michael P. Hermsen VICE PRESIDENT Michael L. Klofas VICE PRESIDENT Richard E. Spencer, II VICE PRESIDENT [PHOTO OF OFFICERS] 4 MassMutual Participation Investors -------------------------------------------------------------------------------- Eventually, commodity prices tumbled, relieving some inflation fears, and economic growth was sustained even as the housing market declined. The market focused on continued solid earnings growth, reasonable inflation and stable interest rates. Overall, the US economy remains in good shape, but not without question marks. The unemployment rate in 2006 dropped to 4.5 percent from 5 percent the previous year, according to the US Department of Labor. However, core inflation was up to 2.6 percent from 2.2 percent in both 2005 and 2004, and the value of the dollar versus several other currencies dropped in 2006 and is expected to continue to drop in 2007. Investors continued to witness an ever stronger corporate-credit market in 2006. Corporate credit defaults around the globe continued their downward trend for the fifth consecutive year, as reported by Moody's Investors Service. Moody's global issuerweighted speculative-grade default rate finished the year at 1.7 percent, down from 1.9 percent in 2005 and its lowest level since 1996. Moody's expects the default rate to climb in 2007 but remain well below its historical average of 5 percent. Overall, the Trust closed 24 new private placement transactions during 2006 - a record number - and added to eight existing private placement investments. Total direct placement volume of $31,176,825 is also a record for the Trust. New private placement transactions invested in during the year were: Momentum Holding Co.; NABCO, Inc.; Duncan Systems, Inc.; Flutes Inc.; OakRiver Technology, Inc.; Overton's Holding Company.; Magnatech International Inc.; Wellborn Forest Holding Co.; Bravo Sports Holding Corporation; Davis- Standard LLC; F H S Holdings LLC; Fowler Holding, Inc.; Fuel Systems Holding Corporation; H M Holding Company; K N B Holdings Corporation; Monessen Holding Corporation; Morton Industrial Group, Inc.; Ontario Drive & Gear Ltd.; PAS Holdco LLC; P I I Holding Corporation; Postle Aluminum Company LLC; R A J Manufacturing Holdings LLC; Radiac Abrasives, Inc.; and Stanton Carpet Holding Co. In addition, the Trust added to existing private placement investments in Augusta Sportswear Holding Co.; A T I Acquisition Company; American Hospice Management Holding LLC; River Ranch Fresh Foods LLC; Consolidated Foundries Holdings; Eagle Pack Pet Foods, Inc.; MicroGroup, Inc.; and Terra Renewal Services, Inc. 5 MassMutual Participation Investors -------------------------------------------------------------------------------- THE OUTLOOK FOR 2007 Optimism abounds at the beginning of 2007 based on events in the fourth quarter of 2006, but history reminds us that there are no assurances a year will finish as it starts. Consumer confidence remains strong, and there are indications that the housing market may be through the worst of the downturn that started in 2006. Oil prices fell precipitously at the end of 2006 after significant increases in 2004 and 2005. The Fed indicates that it is on hold with interest rates for the time being, and the corporate debt market appears in good shape. However, Treasury bond activity is sending mixed signals, the dollar continues to drop, and instability and conflict in the Middle East could create new problems at any time. As always, no one can predict the future with any degree of certainty. Regarding mergers and acquisitions (M&A), there are strong indications that the record M&Aactivity of 2006 around the globe could continue into 2007. Last year was the world's most active M&A environment ever, with $3.79 trillion in announced deals worldwide, up 38 percent from 2005, according to Thomson Financial. Private equity firms had a larger than ever role last year, taking part in 20 percent of these deals, and it is estimated that these firms still have some $750 billion in capital ready to go to work. Buyout firms also appear more willing than most corporations to use debt financing, and the current good health of credit markets may allow buyout firms to push the M&A boom further. Regardless of the economic environment, however, the Trust continues to repeatedly employ the investment philosophy that has served it well since its inception: investing in companies which we believe have a strong business proposition, solid cash flow and experienced, ethical management. This philosophy, combined with Babson Capital's seasoned investment management team and the Trust's financial position, contribute to the Trust being well positioned for future investment opportunities that meet its investment objectives and policies. As always, I would like to thank you for your continued interest in and support of MassMutual Participation Investors. Sincerely, /s/ Clifford M. Noreen -------------------------- Clifford M. Noreen, PRESIDENT CAUTIONARY NOTICE: CERTAIN STATEMENTS CONTAINED IN THIS REPORT TO SHAREHOLDERS MAY BE "FORWARD LOOKING" STATEMENTS WITHIN THE MEANING OF THE PRIVATE SECURITIES LITIGATION ACT OF 1995. THESE STATEMENTS ARE NOT GUARANTEES OF FUTURE PERFORMANCE AND ACTUAL RESULTS MAY DIFFER MATERIALLY FROM THOSE FORECASTED. -------------------------------------------------------------------------------- 2006 Record Net Investment Short-Term Tax Dividends Date Income Gains Effect -------------------------------------------------------------------------------- Regular 05/02/06 $0.2400 -- 07/28/06 0.2400 -- 10/30/06 0.2400 -- 12/29/06 0.2400 -- Special 12/29/06 0.2200 0.0100 ---------------------------------------------- $1.1800 $0.0100 $1.1900 ---------------------------------------------- The following table summarizes the tax effects of the retention of capital gains for 2006: Amount Per Share Form 2439 -------------------------------------------------------------------------------- 2006 Gains Retained 0.9928 Line 1a Long-Term Gains Retained 0.9928 Taxes Paid 0.3475 Line 2* Basis Adjustment 0.6453 ** -------------------------------------------------------------------------------- * IF YOU ARE NOT SUBJECT TO FEDERAL CAPITAL GAINS TAX (E.G., CHARITABLE ORGANIZATIONS, IRAS AND KEOGH PLANS), YOU MAY BE ABLE TO CLAIM A REFUND BY FILING FORM 990-T. **FOR FEDERAL INCOME TAX PURPOSES, YOU MAY INCREASE THE ADJUSTED COST BASIS OF YOUR SHARES BY THIS AMOUNT (THE EXCESS OF LINE 1A OVER LINE 2). Qualified for Dividend Interest Earned on Annual Dividend Received Deduction*** Qualified Dividends**** U.S. Gov't. Obligations Amount Per Share Percent Amount Per Share Percent Amount Per Share Percent Amount Per Share --------------------------------------------------------------------------------------------------------------- $1.19 14.4857% 0.1713 14.4871% 0.1714 0.0000% 0.0000 --------------------------------------------------------------------------------------------------------------- *** NOT AVAILABLE TO INDIVIDUAL SHAREHOLDERS ****QUALIFIED DIVIDENDS ARE REPORTED IN BOX 1B ON IRS FORM 1099-DIV FOR 2006 6 MassMutual Participation Investors -------------------------------------------------------------------------------- FINANCIAL REPORT Consolidated Statement of Assets and Liabilities . . . . . . . . . . . . . 8 Consolidated Statement of Operations . . . . . . . . . . . . . . . . . . . 9 Consolidated Statement of Cash Flows . . . . . . . . . . . . . . . . . . . 10 Consolidated Statements of Changes in Net Assets . . . . . . . . . . . . . 11 Consolidated Selected Financial Highlights . . . . . . . . . . . . . . . . 12 Consolidated Schedule of Investments . . . . . . . . . . . . . . . . . . . 13-33 Notes to Consolidated Financial Statements . . . . . . . . . . . . . . . . 34-37 Report of Independent Registered Public Accounting Firm. . . . . . . . . . 38 Interested Trustees. . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-40 Independent Trustees . . . . . . . . . . . . . . . . . . . . . . . . . . . 41-43 Officers of the Trust. . . . . . . . . . . . . . . . . . . . . . . . . . . 44 MassMutual Participation Investors -------------------------------------------------------------------------------- CONSOLIDATED STATEMENT OF ASSETS AND LIABILITIES DECEMBER 31, 2006 ASSETS: Investments (See Consolidated Schedule of Investments) Corporate restricted securities at fair value (Cost - $97,784,691) $ 99,625,434 Corporate public securities at market value (Cost - $34,528,692) 35,218,236 Short-term securities at amortized cost 6,854,407 ------------- 141,698,077 ------------- Cash 2,643,735 Interest and dividends receivable 3,000,826 Receivable for investments sold 256,492 ------------- TOTAL ASSETS 147,599,130 ------------- LIABILITIES: Dividend payable 4,608,487 Investment advisory fee payable 284,659 Note payable 12,000,000 Interest payable 88,933 Accrued expenses 142,737 Accrued taxes payable 3,959,301 ------------- TOTAL LIABILITIES 21,084,117 ------------- TOTAL NET ASSETS $ 126,515,013 ============= NET ASSETS: Common shares, par value $.01 per share; an unlimited number authorized $ 98,053 Additional paid-in capital 90,947,008 Retained net realized gain on investments, prior years 25,860,275 Undistributed net investment income 1,028,648 Accumulated net realized gain on investments 6,434,968 Net unrealized appreciation of investments 2,146,061 ------------- TOTAL NET ASSETS $ 126,515,013 ------------- COMMON SHARES ISSUED AND OUTSTANDING 9,805,282 ------------- NET ASSET VALUE PER SHARE $ 12.90 ============= SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. 8 MassMutual Participation Investors -------------------------------------------------------------------------------- CONSOLIDATED STATEMENT OF OPERATIONS FOR THE YEAR ENDED DECEMBER 31, 2006 INVESTMENT INCOME: Interest $ 11,954,924 Dividends 787,336 Other 205,254 ------------- TOTAL INVESTMENT INCOME 12,947,514 ------------- EXPENSES: Investment advisory fees 1,159,175 Interest 733,292 Trustees' fees and expenses 128,000 Professional fees 83,604 Reports to shareholders 65,000 Custodian fees 27,500 Transfer agent/registrar's expenses 14,400 Other 54,890 ------------- TOTAL EXPENSES 2,265,861 ------------- Fees paid indirectly (see Footnote 2.F) (47,009) ------------- NET EXPENSES 2,218,852 ------------- INVESTMENT INCOME - NET 10,728,662 ------------- NET REALIZED AND UNREALIZED GAIN ON INVESTMENTS: Net realized gain on investments before taxes 10,368,862 Income tax expense (3,635,746) ------------- Net realized gain on investments 6,733,116 ------------- Net change in unrealized appreciation of investments before taxes 1,023,375 Net change in deferred income tax expense (208,811) ------------- Net change in unrealized appreciation of investments 814,564 ------------- NET GAIN ON INVESTMENTS 7,547,680 ------------- NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS $ 18,276,342 ============= SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. 9 MassMutual Participation Investors -------------------------------------------------------------------------------- CONSOLIDATED STATEMENT OF CASH FLOWS FOR THE YEAR ENDED DECEMBER 31, 2006 NET DECREASE IN CASH: Cash flows from operating activities: Interest, dividends and other received $ 11,530,240 Interest expense paid (733,292) Operating expenses paid (1,526,054) Income taxes paid (3,599,198) ------------- NET CASH PROVIDED BY OPERATING ACTIVITIES 5,671,696 ------------- Cash flows from investing activities: Purchases/Proceeds/Maturities from short-term portfolio securities, net 8,044,134 Purchases of portfolio securities (48,350,275) Proceeds from disposition of portfolio securities 43,509,939 ------------- NET CASH PROVIDED BY INVESTING ACTIVITIES 3,203,798 ------------- NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES 8,875,494 ============= Cash flows from financing activities: Cash dividends paid from net investment income (9,865,614) Receipts for shares issued on reinvestment of dividends 867,979 ------------- NET CASH USED FOR FINANCING ACTIVITIES (8,997,635) ------------- NET DECREASE IN CASH (122,141) Cash - beginning of year 2,765,876 ------------- CASH - END OF YEAR $ 2,643,735 ============= RECONCILIATION OF NET INCREASE IN NET ASSETS TO NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES: NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS $ 18,276,342 ------------- Increase in investments (9,278,181) Increase in interest and dividends receivable (556,307) Decrease in receivable for investments sold 228,775 Decrease in other assets 12,780 Increase in investment advisory fee payable 16,866 Decrease in accrued expenses (70,140) Increase in accrued taxes payable 245,359 ------------- TOTAL ADJUSTMENTS TO NET ASSETS FROM OPERATIONS (9,400,848) ------------- NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES $ 8,875,494 ============= SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. 10 MassMutual Participation Investors -------------------------------------------------------------------------------- CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS FOR THE YEARS ENDED DECEMBER 31, 2006 AND 2005 2006 2005 ------------------------------------------------------------------------------- INCREASE IN NET ASSETS: Operations: Investment income - net $ 10,728,662 $ 9,643,282 Net realized gain on investments 6,733,116 8,306,079 Net change in unrealized appreciation (depreciation) of investments 814,564 2,350,516 ------------ ------------ Net increase in net assets resulting from operations 18,276,342 20,299,877 ------------ ------------ Increase from common shares issued on reinvestment of dividends Common shares issued (2006 - 61,052; 2005 - 71,671) 867,979 927,722 Dividends to shareholders from: Net investment income (2006 - $1.18 per share; 2005 - $1.01 per share) (11,551,712) (9,818,640) Net realized gains on investments (2006 - $.01 per share) (96,562) -- ------------ ------------ TOTAL INCREASE IN NET ASSETS 7,496,047 11,408,959 ------------ ------------ NET ASSETS, BEGINNING OF YEAR 119,018,966 107,610,007 ------------ ------------ NET ASSETS, END OF YEAR (INCLUDING UNDISTRIBUTED NET INVESTMENT INCOME OF $1,028,648 AND $923,836, RESPECTIVELY) $126,515,013 $119,018,966 ============ ============ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. 11 MassMutual Participation Investors -------------------------------------------------------------------------------- CONSOLIDATED SELECTED FINANCIAL HIGHLIGHTS Selected data for each share of beneficial interest outstanding: For the years ended December 31, 2006 2005 2004 2003 2002 ----------------------------------------------------------------------------------------------------- NET ASSET VALUE: BEGINNING OF YEAR $ 12.21 $ 11.13 $ 9.84 $ 8.78 $ 9.12 ---------- ---------- ---------- ---------- ---------- Net investment income(a) 1.10 0.99 1.00 0.80 0.87 Net realized and unrealized gain (loss) on investments 0.77 1.09 1.36 1.21 (0.35) Total from investment operations 1.87 2.08 2.36 2.01 0.52 ---------- ---------- ---------- ---------- ---------- Dividends from net investment income to common shareholders (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 (1.18) (1.00) (1.07) (0.95) (0.86) ---------- ---------- ---------- ---------- ---------- NET ASSET VALUE: END OF YEAR $ 12.90 $ 12.21 $ 11.13 $ 9.84 $ 8.78 ---------- ---------- ---------- ---------- ---------- PER SHARE MARKET VALUE: END OF YEAR $ 14.70 $ 14.05 $ 13.31 $ 11.65 $ 9.40 ========== ========== ========== ========== ========== Total investment return Market value 16.81% 17.25% 25.77% 35.50% 12.58% Net asset value(c) 18.64% 22.51% 25.14% 23.72% 5.70% Net assets (in millions): End of year $ 126.52 $ 119.02 $ 107.61 $ 94.40 $ 83.59 Ratio of operating expenses to average net assets 1.17% 1.45% 1.63% 1.65% 1.27% Ratio of interest expense to average net assets 0.57% 0.80% 0.89% 0.97% 1.08% Ratio of total expenses before custodian reduction to average net assets 1.78% 2.28% 2.52% 2.62% 2.35% Ratio of net expenses after custodian reduction to average net assets 1.74% 2.25% 2.52% 2.62% 2.35% Ratio of net investment income to average net assets 8.43% 8.45% 9.60% 8.55% 9.42% Portfolio turnover 34.14% 31.50% 51.25% 55.08% 35.32% (A) CALCULATED USING AVERAGE SHARES. (B) AMOUNT INCLUDES $0.10 PER SHARE IN LITIGATION PROCEEDS. (C) 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. Senior securities: Total principal amount (in millions) $ 12 $ 12 $ 22.5 $ 22.5 $ 22.5 Asset coverage per $1,000 of indebtedness $ 11,543 $ 10,918 $ 5,783 $ 5,195 $ 4,715 SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. 12 12 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities - 78.75%:(A) Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- Private Placement Investments - 73.90% 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 $ 1,058,908 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 (B) 33,505 shs. 03/23/06 33,860 335 ------------- ------------- 1,158,860 1,059,255 ------------- ------------- ADORN, INC. A manufacturer of wall panels, cabinets, moldings and countertops for houses and recreational vehicles. 12.5% Subordinated Note due 2012 $ 775,862 02/29/00 734,067 775,862 Warrant, exercisable until 2012, to purchase common stock at $.02 per share 192 shs. 02/29/00 162,931 324,694 ------------- ------------- 896,998 1,100,556 ------------- ------------- AMERCABLE, INC. A manufacturer of electric power, instrumentation and control cables, primarily for the mining and oil and gas industries. 12% Senior Subordinated Note due 2013 $ 583,333 04/08/05 553,180 595,000 Limited Partnership Interest (B) 0.19% int. 04/07/05 41,667 87,507 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 66 shs. 04/08/05 64,833 138,810 ------------- ------------- 659,680 821,317 ------------- ------------- 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 1,029,447 1,145,170 Preferred Class A Unit (B) 1,706 uts. * 170,600 170,600 Common Class B Unit 16,100 uts. 01/22/04 1 18,315 Common Class D Unit (B) 3,690 uts. 09/12/06 -- 4,198 ------------- ------------- *01/22/04 AND 09/12/06. 1,200,048 1,338,283 ------------- ------------- 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 05/18/05 811,574 872,505 Common Stock (B) 263 shs. 05/18/05 263,298 268,416 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 69 shs. 05/18/05 59,362 70,371 ------------- ------------- 1,134,234 1,211,292 ------------- ------------- AUGUSTA SPORTSWEAR HOLDING CO. A manufacturer and distributor of athletic apparel, activewear and team uniforms. 12% Senior Subordinated Note due 2012 $ 893,000 12/31/04 839,870 922,706 Common Stock (B) 275 shs. ** 275,108 494,950 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 73 shs. 12/31/04 63,254 130,956 ------------- ------------- **12/31/04, 03/31/05 AND 05/02/06. 1,178,232 1,548,612 ------------- ------------- 13 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- 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 -- ------------- ------------- 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 1,136,740 1,176,705 Preferred Stock Class A (B) 465 shs. 06/30/06 141,946 134,850 Common Stock (B) 1 sh. 06/30/06 152 145 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 164 shs. 06/30/06 48,760 2 ------------- ------------- 1,327,598 1,311,702 ------------- ------------- CAINS FOODS, L.P. A producer of mayonnaise and sauce products for both the retail and food service markets. Limited Partnership Interest 1.81% int. 09/29/95 22,519 63,647 ------------- ------------- 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 27,704 ------------- ------------- *12/30/97 AND 05/29/99. COEUR, INC. A producer of proprietary, disposable power injection syringes. 8.75% Senior Secured Term Note due 2010 $ 264,493 04/30/03 264,493 268,940 11.5% Senior Subordinated Note due 2011 $ 242,754 04/30/03 227,143 245,122 Common Stock (B) 72,464 shs. 04/30/03 72,463 142,827 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 50,099 shs. 04/30/03 23,317 98,745 ------------- ------------- 587,416 755,634 ------------- ------------- COINING CORPORATION OF AMERICA LLC A manufacturer of close tolerance parts and metal stampings. 10.62% Senior Secured Revolving Credit Facility due 2007 (C) $ 24,691 01/07/02 24,691 24,593 10.62% Senior Secured Tranche A Note due 2007 (C) $ 403,358 06/26/01 403,358 400,429 13% Senior Secured Tranche B Note due 2008 $ 370,370 06/26/01 370,370 373,488 Limited Partnership Interest (B) 3.65% int. 06/26/01 185,185 941,666 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 61,163 shs. 06/26/01 45,370 311,015 ------------- ------------- 1,028,974 2,051,191 ------------- ------------- 14 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 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 $ 953,475 Limited Partnership Interest (B) 4.43% int. ** 103,135 1,031 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 92 shs. * 84,829 1 ------------- ------------- *08/12/04 AND 01/18/05. **08/12/04 AND 01/14/05. 1,162,552 954,507 ------------- ------------- 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 1,110,419 1,166,892 Common Stock (B) 269 shs. *** 278,521 242,388 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 54 shs. 06/15/05 53,295 1 ------------- ------------- ***06/15/05 AND 05/22/06. 1,442,235 1,409,281 ------------- ------------- 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 1,284,609 1,363,500 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 10 shs. 08/04/05 72,617 35,827 ------------- ------------- 1,357,226 1,399,327 ------------- ------------- 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 10/30/06 914,798 963,283 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 -- ------------- ------------- 1,330,917 1,316,435 ------------- ------------- DEXTER MAGNETICS TECHNOLOGIES, INC. A designer, fabricator, assembler and distributor of industrial magnets and subassemblies in North America and Europe. Common Stock 310 shs. 07/19/01 185,869 426,449 Warrant, exercisable until 2007, to purchase common stock at $.01 per share 157 shs. 07/19/01 69,872 216,143 ------------- ------------- 255,741 642,592 ------------- ------------- DIRECTED ELECTRONICS, INC. A designer and distributor of brand name automotive security systems, audio products and installation accessories. Common Stock (B) 126,817 shs. 12/19/05 40,518 1,306,847 Common Stock (B) 68,301 shs. 06/17/06 942,350 782,046 Limited Partnership Interest (B) 4.61% int. **** -- 188,164 ------------- ------------- ****12/22/99 AND 09/14/05. 982,868 2,277,057 ------------- ------------- 15 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- 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 1,392,067 696,032 Warrants, exercisable until 2011, to purchase common stock of DHI Holdings, Inc. at $.01 per share (B) 6,676 shs. * 201,655 -- ------------- ------------- *10/24/96 AND 08/28/98. 1,960,217 696,032 ------------- ------------- DUNCAN SYSTEMS, INC. A distributor of windshields and side glass for the recreational vehicle market. 10% Senior Secured Term Note due 2013 $ 308,571 11/01/06 303,942 302,750 13% Senior Subordinated Note due 2014 $ 488,572 11/01/06 434,739 478,071 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 ------------- ------------- 886,201 878,858 ------------- ------------- DWYER GROUP, INC. A franchiser of a variety of home repair services. Common Stock (B) 3,656 shs. ** 365,600 380,224 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 1,077 shs. 10/30/03 98,719 111,967 ------------- ------------- **10/30/03 AND 01/02/04. 464,319 492,191 ------------- ------------- 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 72,676 ------------- ------------- EAGLE PACK PET FOODS, INC. A manufacturer of premium pet food sold through independent pet stores. 12% Senior Subordinated Note due 2011 $ 803,572 *** 783,149 811,608 Warrant, exercisable until 2011, to purchase common stock at $.02 per share 2,163 shs. 09/24/04 20,893 45,273 ------------- ------------- ***09/24/04 AND 4/20/06. 804,042 856,881 ------------- ------------- 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 (B) 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 1,178,426 1,285,097 Preferred Unit (B) 84 uts. 06/01/06 83,530 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 ------------- ------------- 1,327,579 1,419,334 ------------- ------------- 16 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- 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 $ 528,418 14% Senior Subordinated Note due 2014 $ 315,599 04/13/06 282,970 318,158 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 ------------- ------------- 890,100 903,035 ------------- ------------- FOWLER HOLDING, INC. Aprovider 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 1,131,875 1,235,862 Common Stock (B) 98 shs. 02/03/06 97,826 88,047 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 135 shs. 02/03/06 110,348 1 ------------- ------------- 1,340,049 1,323,910 ------------- ------------- 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 1,153,828 1,258,023 Common Stock (B) 112,500 shs. 01/31/06 112,500 101,250 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 73,275 shs. 01/31/06 63,113 733 ------------- ------------- 1,329,441 1,360,006 ------------- ------------- 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 1,088,439 1,133,764 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 ------------- ------------- 1,330,314 1,277,765 ------------- ------------- 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 * 993,714 1,105,240 Common Stock (B) 33 shs. * 33,216 44,369 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 106 shs. * 105,618 141,066 ------------- ------------- *06/30/04 AND 08/19/04. 1,132,548 1,290,675 ------------- ------------- INTEGRATION TECHNOLOGY SYSTEMS, INC. A manufacturer of steel protective computer and network systems for the industrial and office environments. 12% Senior Secured Note due 2007 $ 949,004 03/01/04 938,546 711,753 Common Stock (B) 130 shs. 06/01/00 149,500 -- ------------- ------------- 1,088,046 711,753 ------------- ------------- 17 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- ITC^DELTACOM, INC. A provider of integrated communications services in the southeastern United States. 13.88% Senior Secured Note due 2009 (C) $ 1,184,808 07/26/05 $ 1,161,309 $ 1,187,637 17.38% Senior Secured Note due 2009 (C) $ 192,284 07/26/05 169,489 192,200 Warrant, exercisable until 2009, to purchase convertible preferred stock at $.01 per share (B) 54,468 shs. 07/26/05 18,156 138,349 ------------- ------------- 1,348,954 1,518,186 ------------- ------------- JASON, INC. A diversified manufacturing company serving various industrial markets. 13% Senior Subordinated Note due 2008 $ 510,187 08/04/00 489,272 505,085 14% Cumulative Redeemable Preferred Stock Series A (B) 153 shs. 08/04/00 153,119 148,525 Limited Partnership Interest of Saw Mill Capital Fund II, L.P. (B) 1.30% int. 08/03/00 469,245 375,461 Warrants, exercisable until 2008 and 2009, to purchase common stock at $.01 per share (B) 26,931 shs. 08/04/00 61,101 21,544 ------------- ------------- 1,172,737 1,050,615 ------------- ------------- JUSTRITE MANUFACTURING ACQUISITION CO. A manufacturer of safety products such as storage cabinets and containers. 12% Senior Subordinated Note due 2011 $ 843,750 12/15/04 800,394 852,188 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 594 shs. 12/15/04 53,528 41,672 ------------- ------------- 853,922 893,860 ------------- ------------- K N B HOLDINGS CORPORATION A designer, manufacturer and marketer of products for the custom framing market. 13.5% Senior Subordinated Note due 2013 $ 1,285,669 05/25/06 1,224,165 1,282,434 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 ------------- ------------- 1,333,089 1,346,818 ------------- ------------- KEEPSAKE QUILTING, INC. A seller of quilting fabrics, books, patterns, kits and notions to consumers. 8.87% Senior Secured Revolving Note due 2007 (C) $ 62,902 06/16/00 62,902 63,165 8.87% Senior Secured Tranche A Note due 2007 (C) $ 78,627 07/19/00 78,627 78,279 12% Senior Secured Tranche B Note due 2008 $ 314,509 06/16/00 307,577 316,523 Limited Partnership Interest of Riverside XVI Holding Company, L.P. (B) 3.02% int. 06/12/00 190,563 184,682 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 633 shs. 06/12/00 26,209 61,908 ------------- ------------- 665,878 704,557 ------------- ------------- KELE AND ASSOCIATES, INC. A distributor of building automation control products. 12% Senior Subordinated Note due 2012 $ 969,643 02/27/04 897,914 998,732 Preferred Stock (B) 12 shs. 11/24/04 237,794 241,915 Common Stock (B) 6 shs. 02/27/04 6,814 125,367 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 6 shs. 02/27/04 4,124 114,661 ------------- ------------- 1,146,646 1,480,675 ------------- ------------- KEYSTONE NORTH AMERICA, INC. An operator of funeral homes in North America. Common Stock 28,577 shs. 02/08/05 137,444 146,086 ------------- ------------- 18 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- LIH INVESTORS, L.P. A manufacturer and marketer of a broad line of external accessories for new and used sport utility vehicles, trucks and vans. 12.5% Senior Subordinated Note due 2008 $ 2,036,000 * $ 1,913,294 $ 1,730,600 Common Stock (B) 3,057 shs. * 213,998 3,363 Warrant, exercisable until 2008, to purchase common stock at $.11 per share (B) 8,245 shs. * 318,838 -- ------------- ------------- *12/23/98 AND 01/28/99. 2,446,130 1,733,963 ------------- ------------- 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 $ 675,000 04/05/06 628,522 681,138 13% Preferred Stock (B) 299 shs. 04/05/06 299,295 284,335 Common Stock (B) 66 shs. 04/05/06 66,202 62,890 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 7 shs. 04/05/06 6,832 -- ------------- ------------- 1,000,851 1,028,363 ------------- ------------- MAVERICK ACQUISITION COMPANY A manufacturer of capsules that cover the cork and neck of wine bottles. 9.87% Senior Secured Tranche A Note due 2010 (C) $ 382,783 09/03/04 382,783 384,625 12% Senior Secured Tranche B Note due 2011 $ 179,104 09/03/04 161,544 180,060 Limited Partnership Interest (B) 4.48% int. 09/03/04 33,582 30,722 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 243 shs. 09/03/04 22,556 22,198 ------------- ------------- 600,465 617,605 ------------- ------------- MAXON CORPORATION A manufacturer of industrial combustion equipment and related shut-off valves and control valves. 12% Senior Subordinated Note due 2012 $ 549,837 09/30/04 507,885 566,089 8.75% Senior Subordinated Note due 2012 $ 660,322 09/30/04 660,322 680,840 Common Stock (B) 218,099 shs. 09/30/04 218,099 480,908 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 87,755 shs. 09/30/04 51,941 193,500 ------------- ------------- 1,438,247 1,921,337 ------------- ------------- 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 44,646 Common Stock (B) 13,863 shs. 10/28/04 18,576 43,432 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 47,090 shs. 05/01/03 21,534 147,537 ------------- ------------- 84,399 235,615 ------------- ------------- 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 ** 1,337,558 1,447,925 Common Stock (B) 238 shs. ** 238,000 435,673 Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 87 shs. ** 86,281 158,911 ------------- ------------- **08/12/05 AND 09/11/06. 1,661,839 2,042,509 ------------- ------------- 19 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- 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 $ 551,243 $ 626,742 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 ------------- ------------- 664,146 677,326 ------------- ------------- 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 1,253,658 1,284,120 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 81 shs. 03/31/06 73,125 1 ------------- ------------- 1,326,783 1,284,121 ------------- ------------- MORTON INDUSTRIAL GROUP, INC. A manufacturer of highly engineered metal fabricated components. 12% Senior Subordinated Note due 2014 $ 1,292,246 08/25/06 1,188,781 1,313,626 Common Stock (B) 57,754 shs. 08/25/06 57,754 51,979 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 91,923 shs. 08/25/06 79,380 919 ------------- ------------- 1,325,915 1,366,524 ------------- ------------- MOSS, INC. A manufacturer and distributor of large display and exhibit structures. 9.37% Senior Secured Revolving Note due 2010 (C) $ 94,118 07/03/06 94,118 94,923 9.37% Senior Secured Tranche A Note due 2010 (C) $ 529,412 12/21/05 524,118 532,217 12% Senior Secured Tranche B Note due 2010 $ 200,000 12/21/05 177,059 202,571 Limited Partnership Interest of Riverside Capital Appreciation Fund I, L.P. (B) 19.20% int. * 29 68,849 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 122 shs. 12/21/05 20,941 11,925 ------------- ------------- *09/20/00 AND 05/23/02. 816,265 910,485 ------------- ------------- NABCO, INC. A producer of explosive containment vessels in the United States. 12% Senior Subordinated Note due 2014 $ 330,882 02/24/06 305,770 323,659 Limited Partnership Interest (B) 344 uts. 02/24/06 344,120 326,914 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 26 shs. 02/24/06 19,687 -- ------------- ------------- 669,577 650,573 ------------- ------------- NEFF MOTIVATION, INC. A manufacturer and distributor of customized awards and sportswear to schools. 12.5% Senior Subordinated Note due 2011 $ 562,500 01/31/03 497,912 573,750 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 112 shs. 01/31/03 95,625 159,856 ------------- ------------- 593,537 733,606 ------------- ------------- 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 03/29/04 982,661 993,037 10% Preferred Stock (B) 135 shs. 03/29/04 135,044 135,691 Common Stock (B) 3,418 shs. 03/29/04 3,418 38,053 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 4,565 shs. 03/29/04 3,877 50,818 ------------- ------------- 1,125,000 1,217,599 ------------- ------------- 20 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- NYLONCRAFT, INC. A supplier of engineered plastic components for the automotive industry. 9% Senior Secured Note due 2009 $ 464,286 01/28/02 $ 464,286 $ 441,072 11.5% Senior Subordinated Note due 2012 $ 857,143 01/28/02 798,500 428,572 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 -- ------------- ------------- 1,533,954 869,644 ------------- ------------- 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 1,182,417 1,281,275 Common Stock (B) 93,848 shs. 12/20/05 93,848 84,463 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 52,820 shs. 12/20/05 52,292 528 ------------- ------------- 1,328,557 1,366,266 ------------- ------------- 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 01/03/06 318,268 321,624 13% Senior Subordinated Note due 2013 $ 392,709 01/03/06 351,682 391,024 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 ------------- ------------- 890,026 878,837 ------------- ------------- OLYMPIC SALES, INC. A boat retailer in Washington state, Oregon, California and British Columbia. 12% Senior Subordinated Note due 2008 $ 803,000 08/07/98 803,000 776,556 12% Senior Subordinated Note due 2008 $ 244,154 02/09/00 239,963 240,907 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. ** 206,041 204,198 ------------- ------------- *08/07/98, 02/23/99, 12/22/99 AND 02/25/03. **08/07/98 AND 02/29/00. 2,057,390 2,030,008 ------------- ------------- 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 01/17/06 944,412 1,051,993 Limited Partnership Interest (B) 1,942 uts. 01/17/06 302,885 272,597 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 328 shs. 01/17/06 90,424 3 ------------- ------------- 1,337,721 1,324,593 ------------- ------------- OVERTON'S HOLDING COMPANY A marketer of marine and water sports accessories in the United States. 12% Senior Subordinated Note due 2014 $ 962,104 04/28/06 900,817 965,315 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 -- ------------- ------------- 995,139 1,010,315 ------------- ------------- 21 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- 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 $ 1,153,231 07/03/06 $ 1,094,990 $ 1,152,181 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 -- -- ------------- ------------- 1,333,730 1,378,985 ------------- ------------- 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 1,136,027 1,216,049 Preferred Stock (B) 19 shs. 03/31/06 174,492 165,788 Common Stock (B) 12 shs. 03/31/06 13,500 12,150 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 7 shs. 03/31/06 5,888 -- ------------- ------------- 1,329,907 1,393,987 ------------- ------------- 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 1,073,876 1,116,048 Membership Interests of MM/Lincap PPI Investments, Inc., LLC (B) 1.28% int. 12/21/00 140,625 148,258 ------------- ------------- 1,214,501 1,264,306 ------------- ------------- POSTLE ALUMINUM COMPANY LLC A manufacturer and distributor of aluminum extruded products. 12% Senior Subordinated Note due 2014 $ 1,080,000 10/02/06 998,951 1,074,663 Limited Partnership Interest (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 ------------- ------------- 1,334,939 1,331,164 ------------- ------------- 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 -- ------------- ------------- *11/14/01 AND 08/12/94. 75,582 -- ------------- ------------- QUALIS AUTOMOTIVE LLC A distributor of aftermarket automotive brake and chassis products. 12% Senior Subordinated Note due 2012 $ 937,500 05/28/04 785,250 947,784 Common Stock 187,500 shs. 05/28/04 187,500 216,000 Warrant, exercisable until 2012, to purchase common stock at $.01 per share 199,969 shs. 05/28/04 199,969 230,364 ------------- ------------- 1,172,719 1,394,148 ------------- ------------- 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 -- ------------- ------------- 22 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- R A J MANUFACTURING HOLDINGS LLC A designer and manufacturer of women's swimwear sold under a variety of licensed brand names. 12.5% Senior Subordinated Note due 2014 $ 1,200,277 12/15/06 $ 1,106,663 $ 1,175,644 Limited Partnership Interest (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 1,317,881 ------------- ------------- 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 1,114,411 1,218,999 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 ------------- ------------- 1,331,023 1,357,567 ------------- ------------- 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 Partnership Interest (B) 21,500 uts. 09/29/04 150,000 -- 18% Preferred Stock (B) 75,000 shs. 11/16/06 75,000 75,000 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 12,481 shs. 09/29/04 83,596 -- ------------- ------------- 1,200,000 855,000 ------------- ------------- ROYAL BATHS MANUFACTURING COMPANY A manufacturer and distributor of acrylic and cultured marble bathroom products. 12.5% Senior Subordinated Note due 2011 $ 562,500 11/14/03 514,735 573,750 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 74 shs. 11/14/03 65,089 92,853 ------------- ------------- 579,824 666,603 ------------- ------------- SAFETY SPEED CUT MANUFACTURING COMPANY, INC A manufacturer of vertical panel saws and routers for the wood working industry. 8.87% Senior Secured Tranche A Note due 2007 (C) $ 161,522 06/02/99 161,522 161,522 12% Senior Secured Tranche B Note due 2007 $ 646,089 06/02/99 646,089 646,089 Class B Common Stock (B) 846 shs. 06/02/99 146,456 602,800 ------------- ------------- 954,067 1,410,411 ------------- ------------- SAVAGE SPORTS HOLDING, INC. A manufacturer of sporting firearms. 12% Senior Subordinated Note due 2012 $ 814,655 09/10/04 765,149 821,280 Common Stock (B) 310 shs. 09/10/04 310,345 248,347 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 71 shs. 09/10/04 60,129 56,607 ------------- ------------- 1,135,623 1,126,234 ------------- ------------- 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 -- ------------- ------------- 23 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- STANTON CARPET HOLDING CO. A designer and marketer of high and mid-priced decorative carpets and rugs. 12.13% Senior Subordinated Note due 2014 $ 1,185,366 08/01/06 $ 1,113,468 $ 1,189,678 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 ------------- ------------- 1,327,492 1,337,846 ------------- ------------- 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 Partnership Interest (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 ------------- ------------- 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 1,008,884 1,197,387 Preferred Stock 701 shs. 10/14/05 70,078 72,254 Common Stock (B) 1,167 shs. 10/14/05 1,167 1,050 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 618 shs. 10/14/05 155,860 6 ------------- ------------- 1,235,989 1,270,697 ------------- ------------- 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. 8.64% Senior Secured Tranche B Note due 2012 (C) $ 912,655 04/28/06 910,259 903,346 12% Senior Subordinated Note due 2014 $ 664,062 * 632,101 666,577 Limited Partnership Interest of Saw Mill Capital Fund V, L.P . 2.30% int 03/01/05 123,281 110,955 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 41 shs. 04/28/06 34,627 -- ------------- ------------- *04/28/06 and 09/13/06. 1,700,268 1,680,878 ------------- ------------- 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 1,285,366 1,356,000 Common Stock (B) 315 shs. 02/04/98 315,000 221,130 Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 222 shs. 02/05/98 184,416 155,844 ------------- ------------- 1,784,782 1,732,974 ------------- ------------- TRANSTAR HOLDING COMPANY A distributor of aftermarket automotive transmission parts 12% Senior Subordinated Note due 2013 $ 918,000 08/31/05 880,660 944,514 Common Stock (B) 432 shs. 08/31/05 432,000 410,400 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 46 shs. 08/31/05 41,021 -- ------------- ------------- 1,353,681 1,354,914 ------------- ------------- 24 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 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 $ 451,394 01/20/00 $ 451,394 $ 453,225 12% Senior Subordinated Note due 2010 $ 758,100 01/20/00 735,787 773,124 Common Stock (B) 129,960 shs. 01/20/00 129,960 329,838 Warrant, exercisable until 2010, to purchase common stock at $1 per share (B) 148,911 shs. 01/20/00 56,316 377,936 ------------- ------------- 1,373,457 1,934,123 ------------- ------------- 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 * 1,141,888 1,266,483 Common Stock (B) 393 shs. * 423,985 966,671 Warrant, exercisable until 2013, to purchase common stock at $.02 per share (B) 81 shs. * 84,650 199,634 ------------- ------------- *07/19/05 AND 12/22/05. 1,650,523 2,432,788 ------------- ------------- TRUSTILE DOORS, INC. A manufacturer and distributor of interior doors. 12.5% Senior Subordinated Note due 2010 $ 562,500 04/11/03 532,625 573,654 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 3,060 shs. 04/11/03 50,625 104,669 ------------- ------------- 583,250 678,323 ------------- ------------- TUBULAR TEXTILE MACHINERY A designer, manufacturer, sale and servicer of finishing machinery for the knit and woven segments of the global textile industry. 12% Senior Subordinated Note due 2014 $ 705,457 05/28/04 643,782 699,863 8.75% Senior Secured Note due 2011 $ 409,310 05/28/04 409,310 408,949 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 ------------- ------------- 1,513,061 1,437,425 ------------- ------------- 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 -- ------------- ------------- **12/19/96 AND 09/30/99. 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 04/30/04 907,638 996,500 Common Stock (B) 96 shs. 04/30/04 96,400 144,889 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 122 shs. 04/30/04 112,106 183,366 ------------- ------------- 1,116,144 1,324,755 ------------- ------------- 25 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares, Units, Warrants, Ownership or Acquisition Corporate Restricted Securities:(A) continued Principal Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- VICTORY VENTURES LLC An acquirer of controlling or substantial interests in other entities. Series A Preferred Units (B) 0.04% int. 12/02/96 $ 1 $ -- ------------- ------------- VITALITY FOODSERVICE, INC. A non-carbonated beverage dispensing company focused on the foodservice industry. 13% Senior Subordinated Note due 2011 $ 999,153 09/24/04 921,681 899,238 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 ------------- ------------- *09/24/04 AND 12/22/06 1,160,683 1,112,030 ------------- ------------- 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 07/19/04 785,152 825,750 Limited Partnership Interest Class A (B) 0.93% int. 07/19/04 219,375 186,469 Limited Partnership Interest Class B (B) 0.41% int. 07/19/04 96,848 82,321 ------------- ------------- 1,101,375 1,094,540 ------------- ------------- WALLS INDUSTRIES, INC. A provider of branded workwear and sporting goods apparel. 12.36% Senior Subordinated Lien Note due 2009 (C) $ 444,079 07/12/04 444,079 444,701 14% Senior Subordinated Note due 2012 $ 574,613 07/12/04 573,282 586,105 Limited Partnership Interest (B) 0.20% int. 07/12/04 19,737 390,425 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 2,133 shs. 07/12/04 1,500 42,198 ------------- ------------- 1,038,598 1,463,429 ------------- ------------- WELLBORN FOREST HOLDING CO. A manufacturer of semi-custom kitchen and bath cabinetry. 12.13% Senior Subordinated Note due 2014 $ 911,250 11/30/06 847,271 891,749 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 ------------- ------------- 994,311 987,938 ------------- ------------- TOTAL PRIVATE PLACEMENT INVESTMENTS $ 91,700,517 $ 93,493,887 ------------- ------------- 26 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares or Interest Due Principal Corporate Restricted Securities:(A) continued Rate Date Amount Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- Rule 144A Securities - 4.85%: (A) BONDS - 4.85% A E S Corporation 8.750% 05/15/13 $ 425,000 $ 467,406 $ 455,281 A E S Corporation 9.000 05/15/15 175,000 175,000 188,125 Bombardier, Inc. 6.300 05/01/14 500,000 440,315 470,000 Charter Communications Op LLC 8.000 04/30/12 250,000 249,375 259,688 Douglas Dynamics LLC 7.750 01/15/12 325,000 326,610 305,500 G F S I, Inc. (C) 11.500 06/01/11 375,000 340,343 367,500 H C A, Inc. 9.250 11/15/16 500,000 508,733 535,625 Idearc, Inc. 8.000 11/15/16 300,000 300,000 304,500 Opti Canada, Inc. 8.250 12/15/14 200,000 200,000 205,500 Packaging Dynamics Corporation of America 10.000 05/01/16 850,000 859,989 850,000 Rental Service Corporation 9.500 12/01/14 500,000 507,435 516,250 Stewart & Stevenson LLC 10.000 07/15/14 600,000 613,244 630,000 T C W Lev Income Trust LP 8.410 11/30/07 330,002 330,002 277,564 Tenaska Alabama Partners LP 7.000 06/30/21 179,304 179,304 178,076 Titan International, Inc. 8.000 01/15/12 70,000 70,000 70,438 Tunica-Biloxi Gaming Authority 9.000 11/15/15 500,000 516,411 517,500 ------------ ------------ TOTAL BONDS $ 6,084,167 6,131,547 ------------ ------------ WARRANTS - 0.00% Winsloew Furniture, Inc. (B) 700 $ 7 $ -- ------------ ------------ TOTAL WARRANTS 7 -- ------------ ------------ TOTAL RULE 144A SECURITIES 6,084,174 6,131,547 ------------ ------------ TOTAL CORPORATE RESTRICTED SECURITIES $ 97,784,691 $ 99,625,434 ------------ ------------ 27 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Interest Due Principal Corporate Public Securities-- 27.84%:(A) Rate Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- BONDS - 26.58% Allied Waste NA 7.875% 04/15/13 $ 500,000 $ 513,506 $ 515,625 Appleton Papers, Inc. 8.125 06/15/11 250,000 250,000 255,000 Argo Tech Corporation 9.250 06/01/11 425,000 425,000 459,000 Arrow Electronics, Inc. 7.000 01/15/07 500,000 500,579 500,197 Atlas Pipeline Partners 8.125 12/15/15 600,000 612,415 616,500 BCP Crystal US Holdings Corporation 9.625 06/15/14 355,000 355,000 392,275 Basic Energy Services 7.125 04/15/16 625,000 610,043 615,625 Blockbuster, Inc. (C) 9.000 09/01/12 275,000 276,316 266,063 Cablevision Systems Corporation 8.000 04/15/12 500,000 506,862 491,250 Cadmus Communications Corporation 8.375 06/15/14 500,000 497,375 497,500 Chemed Corporation 8.750 02/24/11 600,000 600,000 621,000 Chesapeake Energy Corporation 7.000 08/15/14 650,000 674,161 660,563 Cincinnati Bell, Inc. 8.375 01/15/14 550,000 503,750 565,125 Clayton Williams Energy, Inc. 7.750 08/01/13 575,000 557,000 530,438 Del Monte Corporation 8.625 12/15/12 200,000 200,000 211,000 Dominos Pizza, Inc. 8.250 07/01/11 109,000 108,213 112,951 Dynegy Holdings, Inc. 8.375 05/01/16 665,000 676,736 698,250 Edison Mission Energy 7.750 06/15/16 235,000 235,000 249,100 El Paso Corporation 7.875 06/15/12 250,000 263,663 268,125 Electronic Data Systems Corporation 7.125 10/15/09 500,000 503,903 521,252 Esterline Technologies 7.750 06/15/13 175,000 175,000 178,500 Exco Resources, Inc. 7.250 01/15/11 500,000 488,750 507,500 Ford Motor Credit Co. 7.375 10/28/09 750,000 748,125 751,598 Ford Motor Credit Co. 8.000 12/15/16 150,000 147,483 148,778 Gencorp, Inc. 9.500 08/15/13 130,000 130,000 137,800 Geo Sub Corporation 11.000 05/15/12 500,000 516,143 482,500 General Motors Acceptance Corporation 5.850 01/14/09 750,000 742,308 747,158 Goodyear Tire & Rubber Co. 7.857 08/15/11 350,000 327,250 351,750 Goodyear Tire & Rubber Co. 9.000 07/01/15 100,000 102,000 104,750 GulfMark Offshore, Inc. 7.750 07/15/14 300,000 298,725 306,000 Harrah's Operating Co. 6.500 06/01/16 450,000 399,000 402,908 Inergy LP 8.250 03/01/16 75,000 75,000 78,750 Intelsat Subsidiary Holding Company Ltd. (C) 10.484 01/15/12 475,000 479,353 479,156 Interline Brands, Inc. 8.125 06/15/14 150,000 148,925 154,125 Iron Mountain, Inc. 8.750 07/15/18 500,000 515,655 530,000 K 2, Inc. 7.375 07/01/14 150,000 150,528 151,500 Koppers, Inc. 9.875 10/15/13 170,000 170,000 184,875 Lazard LLC 7.125 05/15/15 375,000 374,704 388,431 Leucadia National Corporation 7.000 08/15/13 350,000 355,939 355,250 Liberty Media Corporation 5.700 05/15/13 500,000 475,805 471,069 Lodgenet Entertainment Corporation 9.500 06/15/13 375,000 375,000 404,063 M G M Mirage, Inc. 6.000 10/01/09 225,000 226,974 224,438 Mac-Gray Corporation 7.625 08/15/15 300,000 300,000 304,500 Majestic Star Casino LLC 9.500 10/15/10 250,000 250,000 262,500 Manitowoc Company, Inc. 7.125 11/01/13 100,000 100,000 101,000 Markwest Energy Operating Co. 6.875 11/01/14 550,000 532,750 530,750 28 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Interest Due Principal Corporate Public Securities:(A) continued Rate Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- BONDS, CONTINUED Mediacom LLC 9.500% 01/15/13 $ 750,000 $ 745,553 $ 772,500 Metaldyne Corporation (C) 10.000 11/01/13 340,000 341,882 363,800 N R G Energy, Inc. 7.375 02/01/16 600,000 598,750 603,000 Nalco Co. 7.750 11/15/11 250,000 250,000 255,625 National Wine & Spirits, Inc. 10.125 01/15/09 25,000 25,233 25,000 Neiman Marcus Group, Inc. 10.375 10/15/15 600,000 600,000 667,500 Nextel Communications, Inc. 7.375 08/01/15 400,000 408,834 410,170 North American Energy Partners 8.750 12/01/11 200,000 200,000 201,000 Nova Chemicals Corporation (C) 8.502 11/15/13 215,000 215,000 215,000 NTLCable PLC 9.125 08/15/16 690,000 709,720 728,813 O E D Corp/Diamond Jo Company Guarantee 8.750 04/15/12 500,000 492,980 495,000 Offshore Logistics, Inc. 6.125 06/15/13 350,000 350,000 330,750 PQ Corporation 7.500 02/15/13 685,000 677,350 674,725 Pacific Energy Partners 7.125 06/15/14 250,000 251,860 256,553 Pacific Energy Partners 6.250 09/15/15 100,000 99,544 97,764 Petrohawk Energy Corporation 9.125 07/15/13 500,000 498,992 525,000 Pinnacle Foods Group 8.250 12/01/13 225,000 225,000 230,344 Pliant Corporation (C) 11.850 06/15/09 681,103 686,506 743,252 Primedia, Inc. 8.000 05/15/13 500,000 513,632 483,750 Quicksilver Resources, Inc 7.125 04/01/16 600,000 583,125 586,500 Rent-A-Center, Inc. 7.500 05/01/10 250,000 250,000 250,625 Rock-Tenn Co. 8.200 08/15/11 500,000 503,255 527,500 Rogers Wireless, Inc. 7.500 03/15/15 560,000 598,555 607,600 Service Corporation International (C) 7.000 06/15/17 500,000 495,015 506,250 Sheridan Acquisition Corporation 10.250 08/15/11 225,000 222,001 234,000 Sierra Pacific Resources 6.750 08/15/17 330,000 331,577 323,667 Tekni-Plex, Inc. 12.750 06/15/10 500,000 483,500 456,250 Tenet Healthcare Corporation 6.375 12/01/11 250,000 241,250 228,750 Tenet Healthcare Corporation 9.875 07/01/14 350,000 341,859 356,125 Tenneco, Inc. 8.625 11/15/14 500,000 501,250 510,000 Tennessee Gas Pipeline Co. 7.000 03/15/27 250,000 261,869 263,478 Texas Industries, Inc. 7.250 07/15/13 35,000 35,000 35,525 Triton PCS, Inc. 8.500 06/01/13 500,000 500,000 478,750 Tyco International Group SA 6.375 10/15/11 150,000 148,500 156,972 Unisys Corporation 8.000 10/15/12 90,000 90,000 88,988 United Components, Inc. 9.375 06/15/13 535,000 536,267 553,725 United Rentals, Inc. 7.750 11/15/13 325,000 325,000 326,217 Universal City Florida (C) 8.375 05/01/10 100,000 100,000 102,500 Universal City Florida (C) 10.121 05/01/10 100,000 100,000 103,250 Vought Aircraft Industries 8.000 07/15/11 650,000 648,706 625,625 Warner Music Group 7.375 04/15/14 125,000 125,000 123,750 Wornick Co. 10.875 07/15/11 350,000 350,000 313,250 ------------ ------------ TOTAL BONDS $ 33,137,504 $ 33,625,331 ------------ ------------ 29 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Shares or Interest Due Principal Corporate Public Securities:(A)continued Rate Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- COMMON STOCK - 0.55% Allegiant Travel Co. (B) 7,000 $ 126,000 $ 196,420 Distributed Energy Systems Corporation (B) 14,000 177,078 50,400 Heelys, Inc. (B) 5,000 105,000 160,550 Isilon Systems, Inc. (B) 500 6,500 13,800 Melco PBL Entertainment (B) 4,000 76,000 85,040 Nymex Holdings, Inc. (B) 1,500 88,500 186,015 Triana Solar Ltd (B) 200 3,700 3,780 ------------ ------------ Total Common Stock 582,778 696,005 ------------ ------------ CONVERTIBLE BONDS - 0.71% Citadel Broadcasting Corporation 1.875% 02/15/11 $ 300,000 $ 232,875 $ 243,375 ICOS Corporation 2.000 07/01/23 375,000 298,125 367,969 Q L T, Inc. 3.000 09/15/23 305,000 277,410 285,556 ------------ ------------ Total Convertible Bonds 808,410 896,900 ------------ ------------ Total Corporate Public Securities $ 34,528,692 $ 35,218,236 ------------ ------------ Interest Due Principal Short-Term Securities: Rate/Yield Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- COMMERCIAL PAPER - 5.41% Cadbury Schweppes Finance plc 5.354% 01/02/07 $ 2,587,000 $ 2,585,847 $ 2,585,847 ConocoPhillips 5.354 01/03/07 2,000,000 1,998,811 1,998,811 Kraft Foods, Inc. 5.450 01/04/07 775,000 774,419 774,419 Whirlpool Corporation 5.375 01/02/07 1,496,000 1,495,330 1,495,330 ------------ ------------ Total Short-Term Securities $ 6,854,407 $ 6,854,407 ------------ ------------ Total Investments 112.00% $139,167,790 $141,698,077 ------ ============ ------------ Other Assets 4.66 5,901,053 Liabilities (16.66) (21,084,117) ------ ------------ Total Net Assets 100.00% $126,515,013 ====== ============ (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 12/31/06. (D) DEFAULTED SECURITY; INTEREST NOT ACCRUED. SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 30 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Fair Value/ Fair Value/ Industry Classification: Market Value Industry Classification: continued Market Value ------------------------------------------------------------ ------------------------------------------------------------ AEROSPACE - 3.31% BUILDINGS & REAL ESTATE - 1.43% Argo Tech Corporation $ 459,000 Adorn, Inc. $ 1,100,556 Consolidated Foundries Holdings 1,409,281 Texas Industries, Inc. 35,525 Esterline Technologies 178,500 TruStile Doors, Inc. 678,323 Gencorp, Inc. 137,800 ------------ P A S Holdco LLC 1,378,985 1,814,404 Vought Aircraft Industries 625,625 ------------ ------------ CHEMICAL, PLASTICS & RUBBER - 1.38% 4,189,191 BCP Crystal US Holdings Corporation 392,275 ------------ Capital Specialty Plastics, Inc. 27,704 AUTOMOBILE - 10.03% Koppers, Inc. 184,875 Ford Motor Credit Co. 900,376 Nalco Co. 255,625 Fuel Systems Holding Corporation 1,360,006 Nova Chemicals Corporation 215,000 General Motors Acceptance Corporation 747,158 P Q Corporation 674,725 Goodyear Tire & Rubber Co. 456,500 ------------ Jason, Inc. 1,050,615 1,750,204 LIH Investors, L.P. 1,733,963 ------------ Metaldyne Corporation 363,800 CONSUMER PRODUCTS - 8.83% Nyloncraft, Inc. 869,644 Augusta Sportswear Holding Co. 1,548,612 Ontario Drive & Gear Ltd. 1,324,593 Bravo Sports Holding Corporation 1,311,702 Qualis Automotive LLC 1,394,148 G F S I, Inc. 367,500 Tenneco, Inc. 510,000 K N B Holdings Corporation 1,346,818 Titan International, Inc. 70,438 Momentum Holding Co. 677,326 Transtar Holding Company 1,354,914 Neff Motivation, Inc. 733,606 United Components, Inc. 553,725 R A J Manufacturing Holdings LLC 1,317,881 ------------ Royal Baths Manufacturing Company 666,603 12,689,880 The Tranzonic Companies 1,732,974 ------------ Walls Industries, Inc. 1,463,429 BEVERAGE, DRUG & FOOD - 3.95% Winsloew Furniture, Inc. -- Beta Brands Ltd. -- ------------ Cains Foods, L.P. 63,647 11,166,451 Del Monte Corporation 211,000 ------------ Dominos Pizza, Inc. 112,951 CONTAINERS, PACKAGING & GLASS - 5.79% Eagle Pack Pet Foods, Inc. 856,881 Flutes, Inc. 903,035 National Wine & Spirits, Inc. 25,000 Maverick Acquisition Company 617,605 Nonni's Food Company 1,217,599 P I I Holding Corporation 1,393,987 Pinnacle Foods Group 230,344 Packaging Dynamics Corporation of America 850,000 River Ranch Fresh Foods LLC 855,000 Paradigm Packaging, Inc. 1,264,306 Specialty Foods Group, Inc. -- Pliant Corporation 743,252 Vitality Foodservice, Inc. 1,112,030 Tekni-Plex, Inc. 456,250 Wornick Co. 313,250 Vitex Packaging, Inc. 1,094,540 ------------ ------------ 4,997,702 7,322,975 ------------ ------------ BROADCASTING & ENTERTAINMENT - 2.09% DISTRIBUTION - 3.76% Cablevision Systems Corporation 491,250 Duncan Systems, Inc. 878,858 Charter Communications Op LLC 259,688 Kele and Associates, Inc. 1,480,675 Citadel Broadcasting Corporation 243,375 Magnatech International, Inc. 1,028,363 Liberty Media Corporation 471,069 O R S Nasco Holding, Inc. 1,366,266 Lodgenet Entertainment Corporation 404,063 QualServ Corporation -- Mediacom LLC 772,500 Strategic Equipment & Supply Corporation, Inc. -- ------------ ------------ 2,641,945 4,754,162 ------------ ------------ 31 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Fair Value/ Fair Value/ Industry Classification: continued Market Value Industry Classification: continued Market Value ------------------------------------------------------------ ------------------------------------------------------------ DIVERSIFIED/CONGLOMERATE, HEALTHCARE, EDUCATION & CHILDCARE - 4.61% MANUFACTURING - 8.90% A T I Acquisition Company $ 1,059,255 AmerCable, Inc. $ 821,317 American Hospice Management Holding LLC 1,338,283 Arrow Tru-Line Holdings, Inc. 1,211,292 F H S Holdings LLC 1,419,334 Bombardier, Inc. 470,000 H C A, Inc. 535,625 Coining Corporation of America LLC 2,051,191 ICOS Corporation 367,969 Dexter Magnetics Technologies, Inc. 642,592 MedAssist, Inc. 235,615 Douglas Dynamics LLC 305,500 Q L T, Inc. 285,556 Evans Consoles, Inc. -- Tenet Healthcare Corporation 584,875 Geo Sub Corporation 482,500 ------------ Postle Aluminum Company LLC 1,331,164 5,826,512 Radiac Abrasives, Inc. 1,357,567 ------------ Truck Bodies & Equipment International 2,432,788 HOME & OFFICE FURNISHINGS, HOUSEWARES, Tyco International Group SA 156,972 AND DURABLE CONSUMER PRODUCTS - 7.39% ------------ Connor Sport Court International, Inc. 954,507 11,262,883 H M Holding Company 1,277,765 ------------ Home Decor Holding Company 1,290,675 DIVERSIFIED/CONGLOMERATE, SERVICE - 4.90% Justrite Manufacturing Acquisition Co. 893,860 Allied Waste NA 515,625 Monessen Holding Corporation 1,284,121 CapeSuccess LLC 2,512 Stanton Carpet Holding Co. 1,337,846 Chemed Corporation 621,000 U-Line Corporation 1,324,755 Diversco, Inc./DHI Holdings, Inc. 696,032 Wellborn Forest Holding Co. 987,938 Dwyer Group, Inc. 492,191 ------------ Fowler Holding, Inc. 1,323,910 9,351,467 Interline Brands, Inc. 154,125 ------------ Iron Mountain, Inc. 530,000 LEISURE, AMUSEMENT, ENTERTAINMENT - 4.20% Keystone North America, Inc. 146,086 Harrah's Operating Co. 402,908 Mac-Gray Corporation 304,500 K 2, Inc. 151,500 Moss, Inc. 910,485 Keepsake Quilting, Inc. 704,557 Service Corporation International 506,250 M G M Mirage, Inc. 224,438 ------------ Majestic Star Casino LLC 262,500 6,202,716 Melco PBL Entertainment 85,040 ------------ O E D Corp/Diamond Jo Company Guarantee 495,000 ELECTRONICS - 3.16% Overton's Holding Company 1,010,315 A E S Corporation 643,406 Savage Sports Holding, Inc. 1,126,234 Arrow Electronics, Inc. 500,197 Tunica-Biloxi Gaming Authority 517,500 Directed Electronics, Inc. 2,277,057 Universal City Florida 205,750 Distributed Energy Systems Corporation 50,400 Warner Music Group 123,750 Electronic Data Systems Corporation 521,252 ------------ ------------ 5,309,492 3,992,312 ------------ ------------ MACHINERY - 8.57% FARMING & AGRICULTURE - 0.00% Davis-Standard LLC 1,316,435 Protein Genetics, Inc. -- Integration Technology Systems, Inc. 711,753 ------------ Manitowoc Company, Inc. 101,000 FINANCIAL SERVICES - 0.95% Maxon Corporation 1,921,337 Highgate Capital LLC -- Morton Industrial Group, Inc. 1,366,524 Lazard LLC 388,431 Safety Speed Cut Manufacturing Company, Inc. 1,410,411 Leucadia National Corporation 355,250 Stewart & Stevenson LLC 630,000 Nymex Holdings, Inc. 186,015 Synventive Equity LLC 17,714 T C W Leveraged Income Trust, L.P. 277,564 Tronair, Inc. 1,934,123 Victory Ventures LLC -- Tubular Textile Machinery 1,437,425 ------------ ------------ 1,207,260 10,846,722 ------------ ------------ 32 MassMutual Paticipation Investors CONSOLIDATED SCHEDULE OF INVESTMENTS December 31, 2006 Fair Value/ Fair Value/ Industry Classification: continued Market Value Industry Classification: continued Market Value ------------------------------------------------------------ ------------------------------------------------------------ MEDICAL DEVICES/BIOTECH - 2.96% TECHNOLOGY - 0.07% Coeur, Inc. $ 755,634 Triana Solar Ltd. $ 3,780 E X C Acquisition Corporation 72,676 Unisys Corporation 88,988 MicroGroup, Inc. 2,042,509 ------------ OakRiver Technology, Inc. 878,837 92,768 ------------ ------------ 3,749,656 TELECOMMUNICATIONS - 3.80% ------------ Cincinnati Bell, Inc. 565,125 MINING, STEEL, IRON & Intelsat Subsidiary Holding Company Ltd. 479,156 NON PRECIOUS METALS - 0.37% Isilon Systems, Inc. 13,800 U S S Holdings, Inc. 466,871 ITC^DeltaCom, Inc. 1,518,186 ------------ Nextel Communications, Inc. 410,170 NATURAL RESOURCES - 0.62% NTL Cable PLC 728,813 Appleton Papers, Inc. 255,000 Rogers Wireless, Inc. 607,600 Rock-Tenn Co. 527,500 Triton P C S, Inc. 478,750 ------------ ------------ 782,500 4,801,600 ------------ ------------ OIL AND GAS - 4.03% TRANSPORTATION - 1.68% Atlas Pipeline Partners 616,500 Allegiant Travel Co. 196,420 Basic Energy Services 615,625 NABCO, Inc. 650,573 Chesapeake Energy Corporation 660,563 Tangent Rail Corporation 1,270,697 Clayton Williams Energy, Inc. 530,438 ------------ El Paso Corporation 268,125 2,117,690 Exco Resources, Inc. 507,500 ------------ GulfMark Offshore, Inc. 306,000 UTILITIES - 2.80% North American Energy Partners 201,000 Dynegy Holdings, Inc. 698,250 Offshore Logistics, Inc. 330,750 Edison Mission Energy 249,100 Opti Canada, Inc. 205,500 Inergy LP 78,750 Quicksilver Resources, Inc. 586,500 Markwest Energy Operating Co. 530,750 Tennessee Gas Pipeline Co. 263,478 N R G Energy, Inc. 603,000 ------------ Pacific Energy Partners 354,317 5,091,979 Petrohawk Energy Corporation 525,000 ------------ Sierra Pacific Resources 323,667 PHARMACEUTICALS - 1.15% Tenaska Alabama Partners LP 178,076 CorePharma LLC 1,399,327 ------------ Enzymatic Therapy, Inc. 56,250 3,540,910 ------------ ------------ 1,455,577 WASTE MANAGEMENT / POLLUTION - 1.33% ------------ Terra Renewal Services, Inc. 1,680,878 PUBLISHING/PRINTING - 1.20% ------------ Cadmus Communications Corporation 497,500 TOTAL CORPORATE RESTRICTED Idearc, Inc. 304,500 AND PUBLIC SECURITIES - 106.59% $134,843,670 Primedia, Inc 483,750 ============ Sheridan Acquisition Corporation 234,000 ------------ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. 1,519,750 ------------ RETAIL STORES - 3.33% Blockbuster, Inc. 266,063 Heelys, Inc. 160,550 Neiman Marcus Group, Inc. 667,500 Olympic Sales, Inc. 2,030,008 Rent-A-Center, Inc. 250,625 Rental Service Corporation 516,250 United Rentals, Inc. 326,217 ------------ 4,217,213 ------------ 33 MassMutual Participation Investors NOTES TO CONSOLIDATED FINANCIAL STATEMENTS DECEMBER 31, 2006 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, absent an exemption from registration, 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"). The value of restricted securities, including warrants, 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 thereafter used 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 Babson Capital's reports analyzing each portfolio security in accordance with the relevant factors referred to above. Babson Capital has agreed to provide such reports to the Trust at least quarterly. The consolidated financial statements include private placement restricted securities valued at $93,493,887 (73.90% of net assets) as of December 31, 2006 whose values have been determined by the Trustees in the absence of readily ascertainable market values. Due to the inherent uncertainty of valuation, those 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. 34 MassMutual Participation Investors NOTES TO CONSOLIDATED FINANCIAL STATEMENTS DECEMBER 31, 2006 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 December 31, 2006, 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 discount 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. For the year ended December 31, 2006, the Trust had a net realized taxable long-term capital gain balance of $9,831,327, which the Trustees voted to retain and pay the federal capital gain tax thereon. The Trust has accrued income tax expense of $3,407,168 on the Statement of Operations related to the retained realized capital gains. In 2006, the Trust re-classified a total of $927,862 to undistributed net investment income. $900,000 was re-classified from accumulated net realized gain on investments and $27,862 was re-classified from additional paid in capital to more accurately display the Trust's financial position on a tax-basis in accordance with accounting principles generally accepted in the United States of America. These re-classifications had no impact on net asset value. 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 year ended December 31, 2006, the MMPI Subsidiary Trust has accrued income tax expense on net realized gains of $228,578 and increased accrued deferred income tax expenses on net unrealized gains by $208,811. 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. The tax character of distributions declared during the years ended December 31, 2006 and 2005 was as follows: DISTRIBUTIONS PAID FROM: 2006 2005 -------------------------- Ordinary Income $11,648,274 $ 9,818,640 As of December 31, 2006, the components of distributable earnings on a tax basis included $1,067,029 of undistributed ordinary income. Such distributions and distributable earnings on a tax basis are determined in conformity with income tax regulations, which may differ from accounting principles generally accepted in the United States of America. Net investment income of the Trust as presented under accounting principles generally accepted in the United States of America differs from distributable earnings due to earnings from the MMPI Subsidiary Trust as well as timing differences in the recognition of income on certain investments. F. EXPENSE REDUCTION: Citibank, N.A. ("Citibank") serves as custodian to the Trust. Pursuant to the custodian agreement, Citibank receives a fee 35 MassMutual Participation Investors NOTES TO CONSOLIDATED FINANCIAL STATEMENTS DECEMBER 31, 2006 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. 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. 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 year ended December 31, 2006, the Trust incurred total interest expense on the Note of $696,000. 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 (formerly Fleet National Bank) (the "Agent Bank") dated May 29, 1997, which had a stated maturity date of May 31, 2004. The maturity date of this loan was extended to May 31, 2007, and its terms amended and restated pursuant to the First Amended and Restated Revolving Credit Agreement (the "Revolver") dated May 27, 2004, 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 LIBOR 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 LIBOR Rate Loans equals .60% plus the London Inter Bank Offered Rate ("LIBOR") rate, divided by 1 minus LIBOR Reserve Rate. The Trust also incurs expense on the undrawn portion of the total Revolver at a rate of .25% per annum. As of December 31, 2006, there were no outstanding loans against the Revolver. For the year ended December 31, 2006, the Trust incurred expense on the Revolver of $37,292 related to the undrawn portion. 5. PURCHASES AND SALES OF INVESTMENTS FOR THE YEAR COST OF INVESTMENTS ENDED 12/31/2006 ACQUIRED ------------------------------------------------------------------------ Corporate restricted securities $ 38,190,067 Corporate public securities 10,160,208 PROCEEDS FROM SALES OR MATURITIES ------------------------------------------------------------------------ Corporate restricted securities $ 26,895,345 Corporate public securities 16,385,819 The aggregate cost of investments is substantially the same for financial reporting and federal income tax purposes as of December 31, 2006. The net unrealized appreciation of investments for financial reporting and federal tax purposes as of December 31, 2006 is $2,530,287 and consists of $13,025,470 appreciation and $10,495,183 depreciation. Net unrealized appreciation of investments on the Statement of Assets and Liabilities reflects the balance net of a deferred tax accrual of $384,226 on net unrealized gains in the MMPI Subsidiary Trust. 36 MassMutual Participation Investors NOTES TO CONSOLIDATED FINANCIAL STATEMENTS DECEMBER 31, 2006 6. QUARTERLY RESULTS OF INVESTMENT OPERATIONS (UNAUDITED) AMOUNT PER SHARE -------------------------------------------------------------------------------- MARCH 31, 2006 -------------------------------------------------------------------------------- Investment income $3,229,245 Net investment income 2,668,897 $ 0.27 Net realized and unrealized gain on investments (net of taxes) 3,988,640 0.41 -------------------------------------------------------------------------------- JUNE 30, 2006 -------------------------------------------------------------------------------- Investment income 3,094,537 Net investment income 2,530,332 0.26 Net realized and unrealized gain on investments (net of taxes) 3,610,163 0.37 -------------------------------------------------------------------------------- SEPTEMBER 30, 2006 -------------------------------------------------------------------------------- Investment income 3,090,554 Net investment income 2,542,211 0.26 Net realized and unrealized gain on investments (net of taxes) 2,345,586 0.24 -------------------------------------------------------------------------------- DECEMBER 31, 2006 -------------------------------------------------------------------------------- Investment income 3,533,178 Net investment income 2,987,222 0.31 Net realized and unrealized loss on investments (net of taxes) (2,396,709) (0.25) 7. AGGREGATE REMUNERATION PAID TO OFFICERS, TRUSTEES AND THEIR AFFILIATED PERSONS For the year ended December 31, 2006, the Trust paid its Trustees aggregate remuneration of $126,875. During the year 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 Messrs. 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. 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 year ended December 31, 2006, other than amounts payable to Babson Capital pursuant to the Contract. For the year ended December 31, 2006, 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 $12,823 Preparation of Certain of the Trust's Shareholder Communications 208 Preparation of the Trust's Annual Proxy Statements 241 ------- $13,272 ======= 8. NEW ACCOUNTING PRONOUNCEMENTS In June 2006, the Financial Accounting Standards Board ("FASB") issued FASB Interpretation No. 48, ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES -- AN INTERPRETATION OF FASB STATEMENT 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 will require 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. Management of the Trust is currently evaluating the impact that the adoption of FIN 48 will have on the financial statements. FIN 48 will become effective for fiscal years beginning after December 15, 2006. 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. 9. CERTIFICATIONS (UNAUDITED) As required under New York Stock Exchange ("NYSE") Corporate Governance Rules, the Trust's principal executive officer has certified to the NYSE that he was not aware, as of the certification date, of any violation by the Trust of the NYSE's Corporate Governance listing standards. In addition, as required by Section 302 of the Sarbanes-Oxley Act of 2002 and related SEC rules, the Trust's principal executive and principal financial officers have made quarterly certifications, included in filings with the Securities and Exchange Commission on Forms N-CSR and N-Q, relating to, among other things, the Trust's disclosure controls and procedures and internal control over financial reporting, as applicable. 37 MassMutual Participation Investors REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Shareholders and Board of Trustees of MassMutual Participation Investors We have audited the accompanying statement of assets and liabilities of MassMutual Participation Investors (the Trust), including the schedule of investments, as of December 31, 2006, and the related statements of operations and cash flows for the year then ended and the statements of changes in net assets for each of the years in the two-year period then ended and the financial highlights for each of the years in the three-year period then ended. These financial statements and financial highlights are the responsibility of the Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. The financial highlights for each of the years in the two-year period ended December 31, 2003 were audited by other independent registered public accountants whose report, dated February 6, 2004, expressed an unqualified opinion on those financial highlights. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our procedures included verification of securities owned as of December 31, 2006 by correspondence with the custodian and brokers, or by other appropriate auditing procedures where replies from brokers were not received. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of MassMutual Participation Investors as of December 31, 2006, and the results of its operations, its cash flows, the changes in its net assets, and the financial highlights for the years described above in conformity with accounting principles generally accepted in the United States of America. /s/ KPMG LLP --------------------------- Boston, Massachusetts February 9, 2007 38 MassMutual Participation Investors INTERESTED TRUSTEES PRINCIPAL PORTFOLIOS POSITION OCCUPATION(S) OVERSEEN OTHER NAME (AGE), WITH OFFICE TERM/LENGTH DURING PAST IN FUND DIRECTORSHIPS ADDRESS THE TRUST OF TIME SERVED 5 YEARS COMPLEX HELD BY DIRECTOR ------------------------------------------------------------------------------------------------------------------------------------ ROGER W. CRANDALL* (42) Trustee 3 years/ Executive Vice President 2 Trustee, Chairman (since Massachusetts Mutual (since 2005) 1 year, and Chief Investment 2005), President Life Insurance Company 7 months Officer (since 2005) of (2003-2005), and Vice 1295 State Street Chairman MassMutual; and President (2002-2003), Springfield, MA 01111 (since 2005) 1 year/ Chairman (since 2005), of the Trust; Director 7 months President and Chief (since 2004), Babson Executive Officer (since Capital Europe Limited 2006), Vice Chairman (an institutional (2005), Member of the debt-fund manager); Board of Managers (since Director (since 2005), 2004), Member of the Babson Capital Japan KK Board of Directors (2003- (a Japanese registered 2004), and Managing investment adviser); Director of Babson Capital Non- Executive Director (2000-2005). (since 2005), Baring Asset Management Limited (an investment manager/adviser); Chairman (since 2005), Cornerstone Real Estate Advisers LLC (an investment adviser); Director (since 2003), MassMutual Corporate Value Partners Limited (investment company); Director (since 2003), MassMutual Corporate Value Limited (investment company); Director (since 2005), MassMutual Holdings (Bermuda) Ltd. (holding company); Director (since 2005), MassMutual Holding MSC, Inc. (holding company); Director (since 1996), MMHC Investment LLC (investment company); Director (since 2004), MML Assurance, Inc. (a New York insurance company); Director (since 2005), Oppenheimer Acquisition Corp. (holding company); Director (since 2004), Jefferies Finance LLC (a joint venture between Jefferies Group Inc. and Babson Capital); Director (since 2004), Great Lakes LLC (investment company); Director (since 1999), SAAR Holdings CDO Ltd. (investment company); Chairman and Chief Executive Officer (since 2006), MassMutual Capital Partners (investment company); Director (since 2006), Invicta Advisers LLC (derivative trading company); Director (since 2006), Invicta Capital LLC (derivative trading company); Director (since 2006), Invicta Credit LLC (derivative trading company); Director (since 2006), Invicta Holdings LLC (derivative trading company); Trustee (since 2003), President (2003-2005), and Chairman (since 2005), MMCI Subsidiary Trust and MMPI Subsidiary Trust; and Trustee (since 2005), Chairman (since 2005), President (2003-2005), and Vice President (2002-2003), of MassMutual Corporate Investors (closedend investment company advised by Babson Capital). *MR. CRANDALL IS CLASSIFIED AS AN "INTERESTED PERSON" OF THE TRUST AND BABSON CAPITAL (AS DEFINED IN THE INVESTMENT COMPANY ACT OF 1940, AS AMENDED) BECAUSE OF HIS POSITION AS AN OFFICER OF THE TRUST; AND CHAIRMAN, PRESIDENT , CHIEF EXECUTIVE OFFICER, AND MEMBER OF THE BOARD OF MANAGERS OF BABSON CAPITAL. 39 MassMutual Participation Investors INTERESTED TRUSTEES PRINCIPAL PORTFOLIOS POSITION OCCUPATION(S) OVERSEEN OTHER NAME (AGE), WITH OFFICE TERM/LENGTH DURING PAST IN FUND DIRECTORSHIPS ADDRESS THE TRUST OF TIME SERVED 5 YEARS COMPLEX HELD BY DIRECTOR ------------------------------------------------------------------------------------------------------------------------------------ ROBERT E. JOYAL* (62) Trustee 3 years/ President (2001-2003) 51 President (1999-2003) MassMutual (since 2003) 2 years, of Babson Capital. and Trustee (since Participation Investors 10 months 2003), of the Trust; 1500 Main Street Director (since 2006), Suite 600 Jefferies Group, Inc. P.O. Box 15189 (financial services); Springfield, MA 01115-5189 Director (since 2003), Pemco Aviation Group, Inc. (aircraft maintenance and overhaul); Trustee (since 2003), MassMutual Select Funds, formerly MassMutual Institutional Funds, (an open-end investment company advised by MassMutual); Trustee (since 2003), MML Series Investment Fund (an open-end investment company advised by MassMutual); Trustee (1998- 2003), Senior Vice President (1998-2001) and President (2001-2003), MMCI Subsidiary Trust and MMPI Subsidiary Trust; and President (1999-2003), Trustee (since 2003), MassMutual Corporate Investors (closed-end investment company advised by Babson Capital). *MR. JOYAL RETIRED AS PRESIDENT OF BABSON CAPITAL IN JUNE 2003. IN ADDITION AND AS NOTED ABOVE, MR. JOYAL IS A DIRECTOR OF JEFFERIES GROUP, INC., WHICH HAS A WHOLLY OWNED BROKER-DEALER SUBSIDIARY THAT MAY EXECUTE PORTFOLIO TRANSACTIONS AND/OR ENGAGE IN PRINCIPAL TRANSACTIONS WITH THE TRUST, OTHER INVESTMENT COMPANIES ADVISED BY BABSON CAPITAL OR ANY OTHER ADVISORY ACCOUNTS OVER WHICH BABSON CAPITAL HAS BROKERAGE PLACEMENT DISCRETION. ACCORDINGLY, THE TRUST HAS DETERMINED TO CLASSIFY MR. JOYAL AS AN "INTERESTED PERSON" OF THE TRUST AND BABSON CAPITAL (AS DEFINED IN THE INVESTMENT COMPANY ACT OF 1940, AS AMENDED). 40 MassMutual Participation Investors INDEPENDENT TRUSTEES PRINCIPAL PORTFOLIOS POSITION OCCUPATION(S) OVERSEEN OTHER NAME (AGE), WITH OFFICE TERM/LENGTH DURING PAST IN FUND DIRECTORSHIPS ADDRESS THE TRUST OF TIME SERVED 5 YEARS COMPLEX HELD BY DIRECTOR ------------------------------------------------------------------------------------------------------------------------------------ WILLIAM J. BARRETT (67) Trustee 3 years/ President (since 2002), 2 Trustee (since 2006), MassMutual (since 2006) 10 months* Barrett-Gardner Associates, MassMutual Corporate Participation Investors Inc. (investments); and Investors (a closed-end 1500 Main Street Senior Vice President Investment company Suite 600 (1976-2002), Janney advised by Babson P.O. Box 15189 Montgomery Scott LLC Capital). Springfield, MA 01115-5189 (investments). ------------------------------------------------------------------------------------------------------------------------------------ DONALD E. BENSON (76) Trustee 3 years/ Executive Vice President 2 Director (since 1997), MassMutual (since 1988) 2 years, and Director (since 1992), MAIR Holdings, Inc. Participation Investors 10 months Marquette Financial (commuter airline 1500 Main Street Companies (financial holding company); Suite 600 services); Partner (since Director (since 1997), P.O. Box 15189 1996), Benson Family National Mercantile Springfield, MA 01115-5189 Limited Partnership No. 1 Bancorp (bank holding and Benson Family company); and Trustee Limited Partnership No. 2 (since 1986), MassMutual (investment partnerships); Corporate Investors and Partner (1987-2004), (closed-end investment Benson, Pinckney, Oates company advised by Partnership (building Babson Capital). partnership). *MR. BARRETT WAS ELECTED BY THE BOARD OF TRUSTEES TO FILL A NEWLY CREATED BOARD SEAT ON JULY 18, 2006. 41 MassMutual Participation Investors INDEPENDENT TRUSTEES PRINCIPAL PORTFOLIOS POSITION OCCUPATION(S) OVERSEEN OTHER NAME (AGE), WITH OFFICE TERM/LENGTH DURING PAST IN FUND DIRECTORSHIPS ADDRESS THE TRUST OF TIME SERVED 5 YEARS COMPLEX HELD BY DIRECTOR ------------------------------------------------------------------------------------------------------------------------------------ MICHAEL H. BROWN (50) Trustee 3 years/ Private Investor; 2 Trustee (since 2005), MassMutual (since 2005) 1 year, and Managing Director MassMutual Corporate Participation Investors 7 months (1994-2005), Investors (a closed-end 1500 Main Street Morgan Stanley. investment company Suite 600 advised by Babson P.O. Box 15189 Capital); Independent Springfield, MA 01115-5189 Director (since 2006), Invicta Holdings LLC (a derivitive trading company). ------------------------------------------------------------------------------------------------------------------------------------ DONALD GLICKMAN (73) Trustee 3 years/ Chairman (since 1992), 2 Director (since 1984), MassMutual (since 1992) 2 years, Donald Glickman Monro Muffler Brake, Participation Investors 10 months and Company, Inc. Inc. (automobile repair 1500 Main Street (private investments); service); Director Suite 600 and Partner (since 1992), (since 1998), MSC P.O. Box 15189 J.F. Lehman & Co. Software, Corp. Springfield, MA 01115-5189 (private investments). (simulation software); and Trustee (since 1992), MassMutual Corporate Investors (closed-end investment company advised by Babson Capital). 42 MassMutual Participation Investors INDEPENDENT TRUSTEES PRINCIPAL PORTFOLIOS POSITION OCCUPATION(S) OVERSEEN OTHER NAME (AGE), WITH OFFICE TERM/LENGTH DURING PAST IN FUND DIRECTORSHIPS ADDRESS THE TRUST OF TIME SERVED 5 YEARS COMPLEX HELD BY DIRECTOR ------------------------------------------------------------------------------------------------------------------------------------ MARTIN T. HART (71) Trustee 3 years/ Private Investor; and 2 Director (since 2004), MassMutual (since 1991) 10 months President and Director Texas Roadhouse, Inc. Participation Investors (since 1983), H Investment (operates restaurant 1500 Main Street Company LLC (family chain); Director (since Suite 600 partnership). 1999), ValueClick Inc. P.O. Box 15189 (internet advertising Springfield, MA 01115-5189 company); Director (since 2002), Spectranetics Corp. (medical device company); and Trustee (since 1991), MassMutual Corporate Investors (closed-end investment company advised by Babson Capital). ------------------------------------------------------------------------------------------------------------------------------------ CORINE T. NORGAARD (69) Trustee 3 years/ President, (2004-2005), 33 Trustee (since 2005), MassMutual (since 1998) 1 year, Thompson Enterprises MML Series Investment Participation Investors 10 months Real Estate Investment; Fund II (an open-end 1500 Main Street and Dean (1996-2004), investment company Suite 600 Barney School of Business, advised by MassMutual); P.O. Box 15189 University of Hartford. Trustee (since 2004), Springfield, MA 01115-5189 MassMutual Premier Funds, formerly The DLB Fund Group (an open-end investment company advised by MassMutual); Trustee (since 1993), ING Series Fund (investment company); Director (since 1992), ING Variable Series Fund; and Trustee (since 1998), MassMutual Corporate Investors (a closed-end investment company advised by Babson Capital). 43 MassMutual Participation Investors OFFICERS OF THE TRUST PRINCIPAL POSITION OCCUPATION(S) NAME (AGE), WITH OFFICE TERM/LENGTH DURING PAST ADDRESS THE TRUST OF TIME SERVED 5 YEARS ------------------------------------------------------------------------------------------------------------------------------------ CLIFFORD M. NOREEN (49) President 1 year/ President (since 2005), Vice President (1993-2005) of the Trust; MassMutual 7 months Member of the Board of Managers (since 2006), and Managing Participation Investors Director (since 2000) of Babson Capital; Trustee (since 2005), 1500 Main Street o Suite 600 and President (since 2005) MMCI Subsidiary Trust and MMPI P.O. Box 15189 Subsidiary Trust; and President (since 2005), Vice President Springfield, MA 01115-5189 (1993-2005), MassMutual Corporate Investors. ------------------------------------------------------------------------------------------------------------------------------------ RODNEY J. DILLMAN (54) Vice 1 year/ Vice President, Secretary, and Chief Legal Officer (since 2006) MassMutual President, 7 months of the Trust; Vice President and Associate General Counsel (since Participation Investors Secretary, 2000) of MassMutual; General Counsel and Secretary (since 2006) 1500 Main Street o Suite 600 and Chief of Babson Capital; Secretary (since 2006), MMCI Subsidiary Trust P.O. Box 15189 Legal and MMPI Subsidiary Trust; and Vice President, Secretary, and Springfield, MA 01115-5189 Officer Chief Legal Officer (since 2006), MassMutual Corporate Investors. ------------------------------------------------------------------------------------------------------------------------------------ JAMES M. ROY (44) Vice 1 year/ Vice President and Chief Financial Officer (since 2005), MassMutual President 7 months Treasurer (2003-2005), and Associate Treasurer (1999-2003) of the Participation Investors and Chief Trust; Managing Director (since 2005), and Director (2000-2005) 1500 Main Street o Suite 600 Financial of Babson Capital; Trustee (since 2005), Treasurer (since 2005), P.O. Box 15189 Officer and Controller (2003-2005), MMCI Subsidiary Trust and MMPI Springfield, MA 01115-5189 Subsidiary Trust; and Vice President and Chief Financial Officer (since 2005), Treasurer (2003-2005) and Associate Treasurer (1999-2003), MassMutual Corporate Investors. ------------------------------------------------------------------------------------------------------------------------------------ JOHN T. DAVITT, JR. (39) Comptroller 1 year/ Comptroller (since 2001) of the Trust; Director (since 2000) of MassMutual 7 months Babson Capital; Controller (since 2005), MMCI Subsidiary Trust Participation Investors and MMPI Subsidiary Trust; and Comptroller (since 2001), 1500 Main Street o Suite 600 MassMutual Corporate Investors. P.O. Box 15189 Springfield, MA 01115-5189 ------------------------------------------------------------------------------------------------------------------------------------ MELISSA M. LAGRANT (33) Chief 1 year/ Chief Compliance Officer (since 2006) of the Trust; Managing MassMutual Compliance 7 months Director (since 2005) of Babson Capital; Vice President and Participation Investors Officer Senior Compliance Trading Manager (2003-2005), Loomis, Sayles & 1500 Main Street o Suite 600 Company, L.P.; Assistant Vice President- Business Risk Management P.O. Box 15189 Group (2002-2003), and Assistant Vice President- Investment Springfield, MA 01115-5189 Compliance (2001-2002), Zurich Scudder Investments/Deutsche Asset Management; and Chief Compliance Officer (since 2006), MassMutual Corporate Investors. ------------------------------------------------------------------------------------------------------------------------------------ RONALD S. TALAIA (38) Treasurer 1 year/ Treasurer (since 2006) of the Trust; Director (since 2001) of MassMutual 7 months Babson Capital; and Treasurer (since 2006), MassMutual Corporate Participation Investors Investors. 1500 Main Street o Suite 600 P.O. Box 15189 Springfield, MA 01115-5189 44 MassMutual Participation Investors Members of the Board of Trustees [PHOTO] Left to right: Donald Glickman CHAIRMAN, DONALD GLICKMAN & COMPANY, INC. Robert E. Joyal RETIRED PRESIDENT OF BABSON CAPITAL MANAGEMENT LLC William J. Barrett PRESIDENT, BARRETT-GARDNER ASSOCIATES, INC. Michael H. Brown PRIVATE INVESTOR Donald E. Benson* EXECUTIVE VICE PRESIDENT AND DIRECTOR, MARQUETTE FINANCIAL COMPANIES Corine T. Norgaard* PRESIDENT, THOMPSON ENTERPRISES REAL ESTATE INVESTMENT Roger W. Crandall EXECUTIVE VICE PRESIDENT AND CHIEF INVESTMENT OFFICER, MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY Martin T. Hart* PRIVATE INVESTOR *MEMBER OF THE AUDIT COMMITTEE 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. 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. Dividend Reinvestment and Cash Purchase Plan Officers Roger W. Crandall CHAIRMAN Clifford M. Noreen PRESIDENT James M. Roy VICE PRESIDENT & CHIEF FINANCIAL OFFICER Rodney J. Dillman VICE PRESIDENT, SECRETARY & CHIEF LEGAL OFFICER Jill A. Fields VICE PRESIDENT Michael P. Hermsen VICE PRESIDENT Mary Wilson Kibbe VICE PRESIDENT Michael L. Klofas VICE PRESIDENT Richard E. Spencer, II VICE PRESIDENT Ronald S. Talaia TREASURER John T. Davitt, Jr. COMPTROLLER Melissa M. LaGrant CHIEF COMPLIANCE OFFICER [LOGO] MassMutual Participation Investors DB 1036 207 ITEM 2. CODE OF ETHICS. The Registrant adopted a Code of Ethics for Senior Financial Officers (the "Code") on October 17, 2003, which is available on the Registrant's website at www.babsoncapital.com/mpv. During the period covered by this Form N-CSR, there were no amendments to, or waivers from, the Code. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. The Registrant's Board of Trustees has determined that Mr. Donald E. Benson, a Trustee of the Registrant and a member of its Audit Committee, is an audit committee financial expert. Mr. Benson is "independent" for purposes of this Item 3 as required by applicable regulation. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. FEES BILLED TO THE REGISTRANT KPMG LLP KPMG LLP Year Ended Year Ended December 31, December 31, 2006 2005 ---------- ---------- Audit Fees $ 35,500 $ 39,200 Audit-Related Fees 5,400 5,000 Tax Fees 34,500 25,900 All Other Fees 0 0 ---------- ---------- Total Fees $ 75,400 $ 70,100 ========== ========== NON-AUDIT FEES BILLED TO BABSON CAPITAL AND MASSMUTUAL KPMG LLP KPMG LLP Year Ended Year Ended December 31, December 31, 2006 2005 ---------- ---------- Audit-Related Fees $ 988,727 $1,229,916 Tax Fees 18,000 0 All Other Fees 0 0 ---------- ---------- Total Fees $1,006,727 $1,229,916 ========== ========== The category "Audit Related Fees" reflects fees billed by KPMG for various non-audit and non-tax services rendered to the Registrant, Babson Capital Management LLC ("Babson Capital") and Massachusetts Mutual Life Insurance Company ("MassMutual"), such as SAS 70 review, agreed upon procedures reports. Preparation of Federal, state and local income tax and compliance work are representative of the fees billed in the "Tax Fees" category. The category "All Other Fees" represents fees billed by KPMG for tax consulting rendered to Babson Capital and MassMutual. The Sarbanes-Oxley Act of 2002 and its implementing regulations allows the Registrant's Audit Committee to establish a pre-approval policy for certain services rendered by the Registrant's independent accountants. During 2006, the Registrant's Audit Committee approved all of the services rendered to the Registrant by KPMG and did not rely on such a pre-approval policy for any such services. The Audit Committee reviewed the aggregate fees billed for professional services rendered by KPMG for the Registrant and for the non-audit services provided to Babson Capital, and Babson Capital's parent, MassMutual. As part of this review, the Audit Committee considered whether the provision of such non-audit services were compatible with maintaining the principal accountant's independence. The 2005 fees billed represent final 2005 amounts, which may differ from the preliminary figures available as of the filing date of the Trust's 2006 Annual Form N-CSR and includes, among other things, fees for services that may not have been billed as of the filing date of the Trust's 2006 Annual Form N-CSR, but are now properly included in the 2005 fees billed to the Trust, Babson Capital, and MassMutual. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. The Registrant maintains an Audit Committee composed exclusively of Trustees of the Registrant who qualify as "independent" Trustees under the current listing standards of the New York Stock Exchange and the rules of U.S. Securities and Exchange Commission. The Committee operates pursuant to a written Audit Committee Charter, which is available (1) on the Registrant's website, www.babsoncapital.com/mpv; and (2) without charge, upon request, by calling, toll-free 866-399-1516. The current members of the Audit Committee are Donald E. Benson, Martin T. Hart, and Corine T. Norgaard. ITEM 6. SCHEDULE OF INVESTMENTS Not applicable for this filing. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED END MANAGEMENT INVESTMENT COMPANIES. The Registrant's Board of Trustees delegated proxy voting responsibilities relating to voting securities held by the Registrant to its investment adviser, Babson Capital Management LLC ("Babson Capital"). A summary of Babson Capital's proxy voting policies and procedures is set forth below. Summary of Babson Capital's Proxy Voting Policy ----------------------------------------------- Babson Capital views the voting of proxies as an integral part of its investment management responsibility and believes, as a general principle, that proxies should be voted solely in the best interests of its clients (i.e. prudently and in a manner believed by Babson to best protect and enhance an investor's returns). To implement this general principle, it is Babson Capital's policy to generally vote proxies in accordance with the recommendations of Institutional Shareholder Services ("ISS"), a recognized authority on proxy voting and corporate governance, or, in cases where ISS has not made any recommendations with respect to a proxy, in accordance with ISS's proxy voting guidelines. Babson Capital recognizes, however, that there may be times when Babson Capital believes that it will be in the best interests of clients holding the securities to (1) vote against ISS's recommendations or (2) in cases where ISS has not provided Babson Capital with any recommendations with respect to a proxy, vote against ISS's proxy voting guidelines. Babson Capital may vote, in whole or part, against ISS's recommendations or ISS's proxy voting guidelines, as applicable, if such vote is authorized by the Policy. The procedures set forth in the Policy are designed to ensure that votes against ISS's recommendations or proxy voting guidelines have been made in the best interests of clients and are not the result of any material conflict of interest (a "Material Conflict"). Summary of Babson Capital's Proxy Voting Procedures --------------------------------------------------- Babson Capital has (1) established a Proxy Committee that is responsible for the implementation and governance of the Policy and (2) designated Proxy Administrators who will receive and post proxies for voting with ISS. In accordance with the Policy, Babson Capital will generally vote all client proxies in accordance with ISS's recommendation or proxy voting guidelines, unless a person authorized by the Proxy Committee (each a "Proxy Analyst") determines that it is in its clients' best interest to vote against ISS's recommendation or proxy voting guidelines. In these cases, Babson Capital will vote against ISS's recommendation or proxy voting guidelines, so long as no other Proxy Analyst reviewing such proxy disagrees with such recommendation, and no known Material Conflict is identified by the Proxy Analyst(s) or the Proxy Administrator. Otherwise, the proxy is to be submitted to a member of the Proxy Committee, who shall determine how to vote the proxy unless (i) the Proxy Administrator has identified a Babson Capital Material Conflict or (ii) said Proxy Committee member has identified a Material Conflict. In such cases, the proxy shall be submitted to the Proxy Committee, which may authorize a vote against ISS's recommendation or proxy voting guidelines only if the Proxy Committee determines that such vote is in the clients' best interests. No employee, officer or director of Babson Capital or its affiliates (other than those assigned such responsibilities under the Policy) may influence how Babson Capital votes any proxy, unless such person has been requested to provide such assistance by a Portfolio Manager or Proxy Committee member and has disclosed any known Material Conflict. Any pre-vote communications prohibited by the Policy shall be reported to the Proxy Committee member prior to voting and to Babson Capital's General Counsel. Obtaining a Copy of the Policy ------------------------------ The full text of Babson Capital's Policy is available (1) without charge, upon request, by calling 1-866-399-1516 or (2) on the Registrant's website, www.babsoncapital.com/mpv. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. The following disclosure item is made as of the date of this Form N-CSR unless otherwise indicated. PORTFOLIO MANAGER. Clifford M. Noreen serves as the President of the Registrant (since 2005) and as its Portfolio Manager. Mr. Noreen began his service to the Registrant in 1993 as a Vice President. With over 25 years of industry experience, Mr. Noreen is a Managing Director and a Member of the Board of Managers of Babson Capital Management LLC ("Babson Capital") and head of Babson Capital's Corporate Securities Group, where he oversees public equities and corporate credit related investments, including public and private bonds, mezzanine, and private equity investments, and structured credit products. Mr. Noreen joined Massachusetts Mutual Life Insurance Company ("MassMutual"), Babson Capital's parent company, in 1985 and began leading its High Yield Team in 1992, where he was responsible for oversight of all public high yield portfolios. In 2004, Mr. Noreen assumed responsibility for Babson Capital's Public Corporate Credit Group, which included the Investment Grade and High Yield Institutional Fixed Income teams. Mr. Noreen also presently serves as President of MassMutual Corporate Investors, another closed-end registered investment company advised by Babson Capital. Mr. Noreen holds a B.A. from the University of Massachusetts and an M.B.A from American International College. PORTFOLIO MANAGEMENT TEAM. Mr. Noreen has primary responsibility for overseeing the investment of the Registrant's portfolio, with the day-to-day investment management responsibility of the Registrant's portfolio being shared with the following Babson Capital investment professionals (together with the Portfolio Manager, the "Portfolio Team"). Michael P. Hermsen, Michael L. Klofas, and Richard E. Spencer II are each a Vice President of the Registrant and a Managing Director of Babson Capital. Together they are responsible for managing Babson Capital's Mezzanine Investment and Private Equity Investments Team within the Corporate Securities Group, which is responsible for finding, analyzing, negotiating and servicing mezzanine private placement securities for the Registrant. Mr. Hermsen joined MassMutual in 1990 and has been an officer of the Registrant since 1992. Previously, he worked at Teachers Insurance and Annuity Association where he was a generalist private placement analyst. At MassMutual and then Babson Capital, Mr. Hermsen has analyzed and invested in traditional private placements, high yield public and private bonds, and leveraged bank loans. He has also been responsible for managing a small portfolio of distressed investments. Since 1993, he has focused on originating, analyzing, structuring and documenting mezzanine and private equity investments. He holds a B.A. from Bowdoin College and an M.B.A. from Columbia University. Mr. Klofas joined MassMutual in 1988 and has been an officer of the Registrant since 1989. Prior to joining MassMutual, he spent two years at a small venture capital firm and two years at a national public accounting firm. At MassMutual and then Babson Capital, Mr. Klofas has analyzed and invested in traditional private placements and high yield public bonds. He also spent four years leading Babson Capital's workout and restructuring activities. Since 1993, he has focused on originating, analyzing, structuring and documenting mezzanine and private equity investments. Mr. Klofas holds a B.A. from Brandeis University and an M.B.A. from Babson College as well as a Certified Public Accountant designation. Mr. Spencer joined MassMutual in 1989 after three years as a corporate loan analyst at a major New England bank. He has been an officer of Registrant since 1990. At MassMutual and then Babson Capital, Mr. Spencer has analyzed and invested in traditional private placements, high yield public and private bonds, leveraged bank loans, mezzanine debt and private equity. From 1993 to 1999, he was the lead restructuring professional at Babson Capital. Since 1999, Mr. Spencer has been focused on the origination, analysis, structuring and documentation of mezzanine and private equity investments. He holds a B.A. from Bucknell University and an M.B.A. from the State University of New York at Buffalo. Starting in 2006, Jill A. Fields assumed primary day-to-day responsibility for managing the Registrant's public high yield and investment grade fixed income portfolio. Ms. Fields has been a Vice President of the Registrant since 2006. Ms. Fields is a Managing Director of Babson Capital with over 20 years of industry experience in high yield total return, structured credit, leveraged loans and private placemet investing. Prior to joining Babson Capital in 1997, she was a credit analyst at Shawmut National Bank, and the Director of Corporate Bond Research at Hartford Life Insurance Group. Ms. Fields holds a B.S. from Pennsylvania State University and an M.B.A. from the University of Connecticut. OTHER ACCOUNTS MANAGED BY THE PORTFOLIO TEAM. The members of the Registrant's Portfolio Team also have primary responsibility for the day-to-day management of other Babson Capital advisory accounts, including, among others, closed-end and open-end investment companies, private investment funds, MassMutual-affiliated accounts, as well as separate accounts for institutional clients. These advisory accounts are identified below. NUMBER OF ACCOUNTS APPROXIMATE TOTAL WITH ASSET SIZE OF NUMBER APPROXIMATE PERFORMANCE- PERFORMANCE- PORTFOLIO ACCOUNT OF TOTAL ASSET BASED BASED ADVISORY TEAM CATEGORY ACCOUNTS SIZE(A) ADVISORY FEE FEE ACCOUNTS(A) ------------ --------------------- -------- ------------ ------------ -------------- Clifford M. Registered Investment Noreen(B) Companies 1 $251.7 million 1 $251.7 million ----------------------------------------------------------------------------------------- Other Pooled Investment Vehicles 1 $56.5 million 1 $56.5 million ----------------------------------------------------------------------------------------- Other Accounts 0 N/A 0 N/A ----------------------------------------------------------------------------------------- Jill A. Registered Investment Fields Companies 3 $867.1 million 1 $251.7 million ----------------------------------------------------------------------------------------- Other Pooled Investment Vehicles 1 $49.7 million 1 $49.7 million ----------------------------------------------------------------------------------------- Other Accounts 3 $545.6 million 0 N/A ----------------------------------------------------------------------------------------- Michael P. Registered Investment Hermsen Companies 1 $251.7 million 1 $251.7 million ----------------------------------------------------------------------------------------- Other Pooled Investment Vehicles 5 $577.3 million 5 $577.3 million ----------------------------------------------------------------------------------------- Other Accounts 1(C) $1.38 billion N/A N/A ----------------------------------------------------------------------------------------- Michael L. Registered Investment Klofas Companies 1 $251.7 million 1 $251.7 million ----------------------------------------------------------------------------------------- Other Pooled Investment Vehicles 5 $577.3 million 5 $577.3 million ----------------------------------------------------------------------------------------- Other Accounts 1(C) $1.38 billion N/A N/A ----------------------------------------------------------------------------------------- Richard E. Registered Investment Spencer II Companies 1 $251.7 million 1 $251.7 million ----------------------------------------------------------------------------------------- Other Pooled Investment Vehicles 5 $577.3 million 5 $577.3 million ----------------------------------------------------------------------------------------- Other Accounts 1(C) $1.38 billion N/A N/A (A) Account asset size has been calculated as of December 31, 2006. (B) Mr. Noreen, as the head of Babson Capital's Corporate Securities Group, has overall responsibility for all corporate credit related investments, including public and private bonds, mezzanine, and private equity investments, as well as structured credit products managed by Babson Capital. Except for the accounts noted in the table above, Mr. Noreen is not primarily responsible for the day-to-day management of the other accounts managed by Babson Capital's Corporate Securities Group. (C) The listed account and managed assets represent that portion of the general investment account of MassMutual and C.M. Life Insurance Company for which an individual Portfolio Team member has primary day-to-day responsibility. As of December 31, 2005, Babson Capital's total general investment account assets under management were $58.5 billion dollars. MATERIAL CONFLICTS OF INTEREST. The potential for material conflicts of interest may exist as the members of the Portfolio Team have responsibilities for the day-to-day management of multiple accounts. These conflicts may be heightened to the extent the individual, Babson Capital and/or an affiliate has an investment in one or much of such accounts or an interest in the performance of such accounts. Babson Capital has identified (and summarized below) areas where material conflicts of interest are most likely to arise, and has adopted policies and procedures that it believes are reasonably designed to address such conflicts. It is possible that an investment opportunity may be suitable for both the Registrant and other accounts managed by a member of the Portfolio Team, but may not be available in sufficient quantities for both the Registrant and the other accounts to participate fully. Similarly, there may be limited opportunity to sell an investment held by the Registrant and another account. A conflict may arise where a member of the Portfolio Team may have an incentive to treat an account preferentially as compared to the Registrant because the account pays Babson Capital a performance-based fee or a member of the Portfolio Team, Babson Capital, or an affiliate has an interest in the account. Babson Capital has adopted an investment allocation policy and trade allocation procedures to address allocation of portfolio transactions and investment opportunities across multiple clients. These policies are designed to achieve fair and equitable treatment of all clients over time, and specifically prohibit allocations based on performance of an account, the amount or structure of the management fee, performance fee or profit sharing allocations, participation or investment by an employee, Babson Capital or an affiliate, whether the account is public, private, proprietary or third party. Additionally, the Registrant, MassMutual, Babson Capital, MassMutual Corporate Investors, and any private investment company advised or sub-advised by Babson Capital have obtained a blanket order from the Securities and Exchange Commission pursuant to Section 17(d), and Rule 17(d)-1 thereunder, of the Investment Company Act of 1940, as amended, which sets forth the conditions by which the entities can engage in private placement co-investment activities. Potential material conflicts of interest may also arise related to the knowledge and timing of the Registrant's trades, investment opportunities and broker selection. A member of the Portfolio Team will have information about the size, timing and possible market impact of the Registrant's trades. It is theoretically possible that a member of the Portfolio Team could use this information for his or her personal advantage or the advantage of other accounts he manages or the possible detriment of the Registrant. For example, a member of the Portfolio Team could front run a fund's trade or short sell a security for an account immediately prior to the Registrant's sale of that security. To address these conflicts, Babson Capital has adopted policies and procedures governing employees' personal securities transactions, the use of short sales, and trading between the Registrant and other accounts managed by members of the Portfolio Team or accounts owned by Babson Capital or its affiliates. With respect to securities transactions for the Registrant, Babson Capital determines which broker to use to execute each order, consistent with its duty to seek best execution of the transaction. Babson Capital manages certain other accounts, however, where Babson Capital may be limited by the client with respect to the selection of brokers or directed to trade such client's transactions through a particular broker. In these cases, trades for a fund in a particular security may be placed separately from, rather than aggregated with, such other accounts. Placing separate transaction orders for a security may temporarily affect the market price of the security or otherwise affect the execution of the transaction to the possible detriment of a fund or the other account(s) involved. Babson Capital has policies and procedures that address best execution and directed brokerage. Members of the Portfolio Team may also face other potential conflicts of interest in managing the Registrant, and the above is not a complete description of every conflict of interest that could be deemed to exist in managing both the Registrant and the other accounts listed above. COMPENSATION. The current Babson Capital compensation and incentive program for investment professionals is designed to attract, motivate and retain high-performing individuals. To help Babson Capital make informed decisions, the Company participates in annual compensation surveys of investment management firms using McLagan Partners, in addition to other industry specific resources. The firms selected for periodic peer-group comparisons typically have similar asset size or business mix. Annually, a review is conducted of total compensation versus market, to ensure that individual pay is competitive with the defined overall market. The compensation package for the members of the Portfolio Team is comprised of a market-driven base salary, a performance-driven annual bonus, and discretionary long-term incentives. The performance-driven bonus is based on the performance of the accounts managed by the members of the Portfolio Team relative to appropriate benchmarks, including with respect to the Registrant, to the Lehman Brothers Intermediate U.S. Credit and the S & P Industrial Index, in addition to the Russell 2000 Index and Lehman Brothers U.S. Corporate High Yield Index. Performance of the Registrant, like other accounts Portfolio Team members manage, are evaluated on a pre-tax basis, and are reviewed over one and three-year periods, with greater emphasis given to the latter. There are other factors that affect bonus awards to a lesser extent, such as client satisfaction, teamwork, the assets under management, and the overall success of Babson Capital. Such factors are considered as a part of the overall annual bonus evaluation process by the management of Babson Capital. Long-Term incentives are designed to share with participants the longer-term value created in Babson Capital. Long-term incentives may take the form of deferred cash awards (including deferred cash awards that provide a portfolio manager with the economic equivalent of a "shareholder" interest in the firm by linking the value of the award to a formula which ties to the value of the business), and/or, in the case of a portfolio manager who manages a private investment fund with a performance fee, a deferred cash award or a direct profit sharing interest that results in the manager receiving amounts based on the amount of the performance fee paid by such fund. These long-term incentives vest over time and are granted annually, based upon the same criteria used to determine the performance-driven annual bonus detailed above. Because the Portfolio Team members are generally responsible for multiple accounts (including the Registrant), they are compensated on the overall performance of the accounts that they manage, rather than a specific account, except for the portion of compensation relating to any performance fee award. BENEFICIAL OWNERSHIP. As of December 31, 2006, members of the Portfolio Team beneficially owned the following dollar range of equity securities in the Registrant: DOLLAR RANGE OF BENEFICIALLY OWNED* PORTFOLIO TEAM EQUITY SECURITIES OF THE REGISTRANT ---------------------- ----------------------------------- Clifford M. Noreen None Jill A. Fields None Michael P. Hermsen $10,001-$50,000 Michael L. Klofas None Richard E. Spencer II None * Beneficial ownership has been determined in accordance with Rule 16a-1(a)(2) under the Securities Exchange Act of 1934, as amended. 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 half-year 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) CERTIFICATIONS PURSUANT TO RULE 302-2(b) UNDER THE ACT. 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: March 6, 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: March 6, 2007 ---------------------------------- By: /s/ James M. Roy ---------------------------------- James M. Roy, Vice President, and Chief Financial Officer ---------------------------------- Date: March 6, 2007 ----------------------------------