================================================================================


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM N-Q


                   Quarterly Schedule of Portfolio Holdings of
                    Registered Management Investment Company

                  Investment Company Act file number 811-05531




                       MassMutual Participation Investors
--------------------------------------------------------------------------------
               (Exact name of registrant as specified in charter)



                     1500 Main Street, Springfield, MA 01115
--------------------------------------------------------------------------------
               (Address of principal executive offices) (Zip code)



      Patricia J. Walsh, Vice President, Secretary and Chief Legal Officer
               1500 Main Street, Suite 2800, Springfield, MA 01115
--------------------------------------------------------------------------------
                     (Name and address of agent for service)



        Registrant's telephone number, including area code: 413-226-1000


                               ___________________


                         Date of fiscal year end: 12/31

                               ___________________


                       Date of reporting period: 09/30/10

                               ___________________



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CONSOLIDATED SCHEDULE OF INVESTMENTS
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES - 88.56%:(A)                      Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
PRIVATE PLACEMENT INVESTMENTS - 85.66%

A E COMPANY, INC.
A designer and manufacturer of machined parts and assembly structures for the commercial and military aerospace industries.
11% Senior Secured Note due 2015                                 $    807,692                *     $    791,538     $    831,652
13% Senior Subordinated Note due 2016                            $    807,693         11/10/09          722,973          839,017
Common Stock (B)                                                 184,615 shs.         11/10/09          184,615          175,384
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                              92,308 shs.         11/10/09           68,566              923
                                                                                                   ------------     ------------
* 11/10/09 and 11/18/09.                                                                              1,767,692        1,846,976
                                                                                                   ------------     ------------
A H C HOLDING COMPANY, INC.
A designer and manufacturer of boilers and water heaters for the commercial sector.
15% Senior Subordinated Note due 2015                            $  1,342,450         11/21/07        1,315,376        1,355,875
Limited Partnership Interest (B)                                  12.26% int.         11/21/07          119,009          211,457
                                                                                                   ------------     ------------
                                                                                                      1,434,385        1,567,332
                                                                                                   ------------     ------------
A S A P INDUSTRIES LLC
A designer and manufacturer of components used on oil and natural gas wells.
12.5% Senior Subordinated Note due 2015                          $    450,500         12/31/08          391,316          459,510
Limited Liability Company Unit Class A-2 (B)                         677 uts.         12/31/08           74,333          114,819
Limited Liability Company Unit Class A-3 (B)                         608 uts.         12/31/08           66,899          103,338
                                                                                                   ------------     ------------
                                                                                                        532,548          677,667
                                                                                                   ------------     ------------
A S C GROUP, INC.
A designer and manufacturer of high reliability encryption equipment, communications products, computing systems and electronic
components primarily for the military and aerospace sectors.
12.75% Senior Subordinated Note due 2016                         $  1,227,273         10/09/09        1,051,875        1,264,091
Limited Liability Company Unit Class A (B)                         1,249 uts.         10/09/09          122,727          116,595
Limited Liability Company Unit Class B (B)                         1,473 uts.         10/09/09          144,716               15
                                                                                                   ------------     ------------
                                                                                                      1,319,318        1,380,701
                                                                                                   ------------     ------------
A W X HOLDINGS CORPORATION
A provider of aerial equipment rental, sales and repair services to non-residential construction and maintenance contractors
operating in the State of Indiana.
10.5% Senior Secured Term Note due 2014 (D)                      $    420,000         05/15/08          411,600          315,000
13% Senior Subordinated Note due 2015 (D)                        $    420,000         05/15/08          375,946             --
Common Stock (B)                                                  60,000 shs.         05/15/08           60,000             --
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                              21,099 shs.         05/15/08           35,654             --
                                                                                                   ------------     ------------
                                                                                                        883,200          315,000
                                                                                                   ------------     ------------

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8


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
ADVANCED TECHNOLOGIES HOLDINGS
A provider of factory maintenance services to industrial companies.
15% Senior Subordinated Note due 2013                            $  1,172,906         12/27/07     $  1,150,436     $  1,184,635
Preferred Stock (B)                                                  546 shs.         12/27/07          270,000          271,516
                                                                                                   ------------     ------------
                                                                                                      1,420,436        1,456,151
                                                                                                   ------------     ------------
AERO HOLDINGS, INC.
A provider of geospatial services to corporate and government clients.
10.5% Senior Secured Term Note due 2014                          $    930,000         03/09/07          916,050          930,000
14% Senior Subordinated Note due 2015                            $    720,000         03/09/07          663,647          720,000
Common Stock (B)                                                 150,000 shs.         03/09/07          150,000          256,500
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                              37,780 shs.         03/09/07           63,730           64,604
                                                                                                   ------------     ------------
                                                                                                      1,793,427        1,971,104
                                                                                                   ------------     ------------
ALL CURRENT HOLDING COMPANY
A specialty re-seller of essential electrical parts and components primarily serving wholesale distributors.
12% Senior Subordinated Note due 2015                            $    603,697         09/26/08          557,538          609,734
Common Stock (B)                                                     713 shs.         09/26/08           71,303           54,627
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                 507 shs.         09/26/08           46,584           38,844
                                                                                                   ------------     ------------
                                                                                                        675,425          703,205
                                                                                                   ------------     ------------
AMERICAN HOSPICE MANAGEMENT HOLDING LLC
A for-profit hospice care provider in the United States.
12% Senior Subordinated Note due 2013                            $  1,687,503                *        1,606,040        1,687,503
Preferred Class A Unit (B)                                         1,706 uts.               **          170,600          286,167
Preferred Class B Unit (B)                                           808 uts.         06/09/08           80,789          115,493
Common Class B Unit (B)                                           16,100 uts.         01/22/04                1           51,245
Common Class D Unit (B)                                            3,690 uts.         09/12/06             --             11,745
                                                                                                   ------------     ------------
* 01/22/04 and 06/09/08. ** 01/22/04 and 09/12/06.                                                    1,857,430        2,152,153
                                                                                                   ------------     ------------
APEX ANALYTIX HOLDING CORPORATION
A provider of audit recovery and fraud detection services and software to commercial and retail businesses in the U.S. and Europe.
12.5% Senior Subordinated Note due 2016                          $  1,012,500         04/28/09          861,372        1,032,750
Preferred Stock Series B (B)                                       1,623 shs.         04/28/09          162,269          254,727
Common Stock (B)                                                     723 shs.         04/28/09              723          113,528
                                                                                                   ------------     ------------
                                                                                                      1,024,364        1,401,005
                                                                                                   ------------     ------------

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                                                                                                                               9


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
ARROW TRU-LINE HOLDINGS, INC.
A manufacturer of hardware for residential and commercial overhead garage doors in North America.
12% Senior Subordinated Note due 2012                            $    984,209         05/18/05     $    882,714     $    836,577
Preferred Stock (B)                                                   33 shs.         10/16/09           33,224           16,610
Common Stock (B)                                                     263 shs.         05/18/05          263,298             --
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                  69 shs.         05/18/05           59,362             --
                                                                                                   ------------     ------------
                                                                                                      1,238,598          853,187
                                                                                                   ------------     ------------
ASSOCIATED DIVERSIFIED SERVICES
A provider of routine maintenance and repair services primarily to electric utility companies predominantly on electric power
distribution lines.
10% Senior Secured Term Note due 2016 (C)                        $    323,700         09/30/10          323,700          331,509
13% Senior Subordinated Note due 2017                            $    296,180         09/30/10          296,180          328,435
Limited Liability Company Unit Class B (B)                        36,000 uts.         09/30/10           36,000           34,200
Limited Liability Company Unit Class B OID (B)                    27,520 uts.         09/30/10           27,520              275
                                                                                                   ------------     ------------
                                                                                                        683,400          694,419
                                                                                                   ------------     ------------
BARCODES GROUP, INC.
A distibutor and reseller of automatic identification and data capture equipment, including mobile computers, scanners,
point-of-sale systems, labels, and accessories.
13.5% Senior Subordinated Note due 2016                          $    638,651         07/27/10          606,420          654,020
Preferred Stock (B)                                                   13 shs.         07/27/10          131,496          124,925
Common Stock Class A (B)                                              44 shs.         07/27/10              437              415
Warrant, exercisable until 2020, to purchase
  common stock at $.01 per share (B)                                   8 shs.         07/27/10               76             --
                                                                                                   ------------     ------------
                                                                                                        738,429          779,360
                                                                                                   ------------     ------------
BRAVO SPORTS HOLDING CORPORATION
A designer and marketer of niche branded consumer products including canopies, trampolines, in-line skates, skateboards, and
urethane wheels.
12.5% Senior Subordinated Note due 2014                          $  1,207,902         06/30/06        1,154,442        1,207,902
Preferred Stock Class A (B)                                          465 shs.         06/30/06          141,946           84,428
Common Stock (B)                                                        1 sh.         06/30/06              152             --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                 164 shs.         06/30/06           48,760           29,671
                                                                                                   ------------     ------------
                                                                                                      1,345,300        1,322,001
                                                                                                   ------------     ------------
C D N T, INC.
A value-added converter and distributor of specialty pressure sensitive adhesives, foams, films, and foils.
10.5% Senior Secured Term Note due 2014                          $    377,112         08/07/08          373,019          359,355
12.5% Senior Subordinated Note due 2015                          $    429,070         08/07/08          395,705          390,249
Common Stock (B)                                                  41,860 shs.         08/07/08           41,860           19,281
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                              32,914 shs.         08/07/08           32,965           15,160
                                                                                                   ------------     ------------
                                                                                                        843,549          784,045
                                                                                                   ------------     ------------

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10


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
CAPITAL SPECIALTY PLASTICS, INC.
A producer of desiccant strips used for packaging pharmaceutical products.
Common Stock (B)                                                      55 shs.                *     $        252     $    587,055
*12/30/97 and 05/29/99.                                                                            ------------     ------------


CLOUGH, HARBOUR AND ASSOCIATES
An engineering service firm that is located in Albany, NY.
12.25% Senior Subordinated Note due 2015                         $  1,270,588         12/02/08        1,177,994        1,296,000
Preferred Stock (B)                                                  147 shs.         12/02/08          146,594          145,508
                                                                                                   ------------     ------------
                                                                                                      1,324,588        1,441,508
                                                                                                   ------------     ------------
COEUR, INC.
A producer of proprietary, disposable power injection syringes.
12% Senior Subordinated Note due 2016                            $    642,857         10/10/08          581,786          655,714
Common Stock (B)                                                     321 shs.         10/10/08           32,143           20,321
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                 495 shs.         10/10/08           48,214           31,263
                                                                                                   ------------     ------------
                                                                                                        662,143          707,298
                                                                                                   ------------     ------------
CONNECTICUT ELECTRIC, INC.
A supplier and distributor of electrical products sold into the retail and wholesale markets.
10% Senior Subordinated Note due 2014 (D)                        $    771,051         01/12/07          719,275          385,526
Limited Liability Company Unit Class A (B)                        82,613 uts.         01/12/07           82,613             --
Limited Liability Company Unit Class C (B)                        59,756 uts.         01/12/07           59,756             --
Limited Liability Company Unit Class D (B)                       671,525 uts.         05/03/10             --               --
Limited Liability Company Unit Class E (B)                         1,102 uts.         05/03/10             --               --
                                                                                                   ------------     ------------
                                                                                                        861,644          385,526
                                                                                                   ------------     ------------
CONNOR SPORT COURT INTERNATIONAL, INC.
A designer and manufacturer of outdoor and indoor synthetic sports flooring and other temporary flooring products.
Preferred Stock Series B-2 (B)                                     9,081 shs.         07/05/07          370,796          908,072
Preferred Stock Series C (B)                                       4,757 shs.         07/05/07          158,912          475,708
Common Stock (B)                                                     380 shs.         07/05/07                4              271
Limited Partnership Interest (B)                                   6.88% int.                *          103,135             --
                                                                                                   ------------     ------------
*08/12/04 and 01/14/05.                                                                                 632,847        1,384,051
                                                                                                   ------------     ------------
COREPHARMA LLC
A manufacturer of oral dose generic pharmaceuticals targeted at niche applications.
12% Senior Subordinated Note due 2013                            $  1,350,000         08/04/05        1,311,683        1,350,000
Warrant, exercisable until 2013, to purchase
  common stock at $.001 per share (B)                                 10 shs.         08/04/05           72,617          127,518
                                                                                                   ------------     ------------
                                                                                                      1,384,300        1,477,518
                                                                                                   ------------     ------------

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                                                                                                                              11


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
CRANE RENTAL CORPORATION
A crane rental company.
13% Senior Subordinated Note due 2015                            $  1,215,000         08/21/08     $  1,109,821     $  1,212,223
Common Stock (B)                                                 135,000 shs.         08/21/08          135,000             --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                              72,037 shs.         08/21/08          103,143             --
                                                                                                   ------------     ------------
                                                                                                      1,347,964        1,212,223
                                                                                                   ------------     ------------
CUSTOM ENGINEERED WHEELS, INC.
A manufacturer of custom engineered, non-pneumatic plastic wheels and plastic tread cap tires used primarily for lawn and garden
products and wheelchairs.
12.5% Senior Subordinated Note due 2016                          $  1,155,288         10/27/09        1,002,074        1,189,947
Preferred Stock PIK (B)                                              156 shs.         10/27/09          156,468          148,647
Preferred Stock Series A (B)                                         114 shs.         10/27/09          104,374                1
Common Stock (B)                                                      38 shs.         10/27/09           38,244           36,328
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                  28 shs.         10/27/09           25,735             --
                                                                                                   ------------     ------------
                                                                                                      1,326,895        1,374,923
                                                                                                   ------------     ------------
DAVIS-STANDARD LLC
A manufacturer, assembler, and installer of a broad range of capital equipment that is used in the extrusion, conversion, and
processing of plastic materials.
12% Senior Subordinated Note due 2014                            $    978,261         10/30/06          932,143          964,791
Limited Partnership Interest (B)                                   0.97% int.         10/30/06          371,739          402,833
Warrant, exercisable until 2014, to purchase
  preferred stock at $.01 per share (B)                               26 shs.         10/30/06           26,380           38,074
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                  18 shs.         10/30/06           18,000           13,028
                                                                                                   ------------     ------------
                                                                                                      1,348,262        1,418,726
                                                                                                   ------------     ------------
DIVERSCO, INC./DHI HOLDINGS, INC.
A contract provider of janitorial and equipment maintenance services and temporary production labor to industrial customers.
Membership Interests of MM/Lincap
  Diversco Investments Ltd. LLC (B)                               13.57% int.         08/27/98          366,495             --
Warrants, exercisable until 2011, to purchase common
  stock of DHI Holdings, Inc. at $.01 per share (B)                6,676 shs.                *          201,655          236,518
                                                                                                   ------------     ------------
*10/24/96 and 08/28/98.                                                                                 568,150          236,518
                                                                                                   ------------     ------------

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12


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
DUNCAN SYSTEMS, INC.
A distributor of windshields and side glass for the recreational vehicle market.
10% Senior Secured Term Note due 2013                            $    231,429         11/01/06     $    227,957     $    236,797
13% Senior Subordinated Note due 2014                            $    488,572         11/01/06          451,010          488,572
Common Stock (B)                                                 102,857 shs.         11/01/06          102,857           89,494
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                              32,294 shs.         11/01/06           44,663           28,099
                                                                                                   ------------     ------------
                                                                                                        826,487          842,962
                                                                                                   ------------     ------------
DWYER GROUP, INC.
A franchiser of a variety of home repair services.
Common Stock (B)                                                   3,656 shs.                *          365,600          641,230
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                               1,077 shs.         10/30/03           98,719          188,828
                                                                                                   ------------     ------------
*10/30/03 and 01/02/04.                                                                                 464,319          830,058
                                                                                                   ------------     ------------
E S P HOLDCO, INC.
A manufacturer of power protection technology for commercial office equipment, primarily supplying the office equipment dealer
network.
14% Senior Subordinated Note due 2015                            $  1,241,169         01/08/08        1,217,802        1,228,175
Common Stock (B)                                                     349 shs.         01/08/08          174,701           56,045
                                                                                                   ------------     ------------
                                                                                                      1,392,503        1,284,220
                                                                                                   ------------     ------------
E X C ACQUISITION CORPORATION
A manufacturer of pre-filled syringes and pump systems used for intravenous drug delivery.
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                  11 shs.         06/28/04           40,875           40,585
                                                                                                   ------------     ------------
EATEM HOLDING COMPANY
A developer and manufacturer of savory flavor systems for soups, sauces, gravies, and other products produced by food manufacturers
for retail and foodservice end products.
12.5% Senior Subordinated Note due 2018                          $    950,000         02/01/10          823,900          975,521
Common Stock (B)                                                      50 shs.         02/01/10           50,000           47,500
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                 119 shs.         02/01/10          107,100                1
                                                                                                   ------------     ------------
                                                                                                        981,000        1,023,022
                                                                                                   ------------     ------------
F C X HOLDINGS CORPORATION
A distributor of specialty/technical valves, actuators, accessories, and process instrumentation supplying a number of industrial,
high purity, and energy end markets in North America.
15% Senior Subordinated Note due 2015                            $  1,186,983         10/06/08        1,164,123        1,225,365
Preferred Stock (B)                                                2,298 shs.         10/06/08          229,804          112,579
Common Stock (B)                                                   1,625 shs.         10/06/08            1,625             --
                                                                                                   ------------     ------------
                                                                                                      1,395,552        1,337,944
                                                                                                   ------------     ------------

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                                                                                                                              13


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
F F C HOLDING CORPORATION
A leading U.S. manufacturer of private label frozen novelty and ice cream products.
16% Senior Subordinated Note due 2014                            $    829,268         09/27/10     $    812,683     $    827,903
Limited Liability Company Units Preferred (B)                        171 uts.         09/27/10          153,659          145,974
Limited Liability Company Units (B)                                  171 uts.         09/27/10           17,073           16,219
                                                                                                   ------------     ------------
                                                                                                        983,415          990,096
                                                                                                   ------------     ------------
F H S HOLDINGS LLC
A national provider of customized disease management services to large self-insured employers.
12% Senior Subordinated Note due 2014 (D)                        $  1,265,625         06/01/06        1,175,533             --
Limited Liability Company Units of Linden/FHS Holdings LLC (B)        84 uts.         06/01/06           84,368             --
Common Unit Class B (B)                                              734 uts.         06/01/06           64,779             --
                                                                                                   ------------     ------------
                                                                                                      1,324,680             --
                                                                                                   ------------     ------------
FLUTES, INC.
An independent manufacturer of micro fluted corrugated sheet material for the food and consumer products packaging industries.
10% Senior Secured Term Note due 2013 (D)                        $    524,791         04/13/06          516,919          262,396
14% Senior Subordinated Note due 2014 (D)                        $    317,177         04/13/06          283,220             --
                                                                                                   ------------     ------------
                                                                                                        800,139          262,396
                                                                                                   ------------     ------------
GOLDEN COUNTY FOODS HOLDING, INC.
A manufacturer of frozen appetizers and snacks.
16% Senior Subordinated Note due 2015                            $  1,012,500         11/01/07          914,607          961,875
16% PIK Note due 2015                                            $    250,259         12/31/08          211,238          237,746
8% Series A Convertible Preferred Stock, convertible into
  fully diluted common shares (B)                                 77,643 shs.         11/01/07           77,643            7,556
                                                                                                   ------------     ------------
                                                                                                      1,203,488        1,207,177
                                                                                                   ------------     ------------
H M HOLDING COMPANY
A designer, manufacturer, and importer of promotional and wood furniture.
7.5% Senior Subordinated Note due 2013 (D)                       $    362,700         10/15/09          271,181          272,025
Preferred Stock (B)                                                   21 shs.                *           21,428             --
Preferred Stock Series B (B)                                       1,088 shs.         10/15/09          813,544             --
Common Stock (B)                                                     180 shs.         02/10/06          180,000             --
Common Stock Class C (B)                                             296 shs.         10/15/09             --               --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                  67 shs.         02/10/06           61,875             --
                                                                                                   ------------     ------------
* 09/18/07 and 06/27/08.                                                                              1,348,028          272,025
                                                                                                   ------------     ------------
HIGHGATE CAPITAL LLC
An acquirer of controlling or substantial interests in manufacturing and marketing entities.
Series A Preferred Units (B)                                       0.30% int.         07/21/94           91,867             --
                                                                                                   ------------     ------------

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14


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
HOME DECOR HOLDING COMPANY
A designer, manufacturer and marketer of framed art and wall decor products.
12.5% Senior Subordinated Note due 2012                          $  1,081,731                *     $  1,020,116     $  1,081,731
Common Stock (B)                                                      33 shs.                *           33,216           52,744
Warrant, exercisable until 2012, to purchase
  common stock at $.02 per share (B)                                 106 shs.                *          105,618          167,694
                                                                                                   ------------     ------------
* 06/30/04 and 08/19/04.                                                                              1,158,950        1,302,169
                                                                                                   ------------     ------------
HOSPITALITY MINTS HOLDING COMPANY
A manufacturer of individually-wrapped imprinted promotional mints.
12% Senior Subordinated Note due 2016                            $  1,098,837         08/19/08        1,016,628        1,043,895
Common Stock (B)                                                     251 shs.         08/19/08          251,163           59,845
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                  65 shs.         08/19/08           60,233           15,469
                                                                                                   ------------     ------------
                                                                                                      1,328,024        1,119,209
                                                                                                   ------------     ------------
INSURANCE CLAIMS MANAGEMENT, INC.
A third party administrator providing auto and property claim administration services for insurance companies.
Common Stock (B)                                                      37 shs.         02/27/07            1,100          140,272
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                  11 shs.         02/27/07              324           41,322
                                                                                                   ------------     ------------
                                                                                                          1,424          181,594
                                                                                                   ------------     ------------
INTERNATIONAL OFFSHORE SERVICES LLC
A leading provider of marine transportation services, platform decomissioning, and salvage services to oil and gas producers in the
shallow waters of the Gulf of Mexico.
14.25% Senior Subordinated Secured Note due 2017                 $  1,350,000         07/07/09        1,217,417        1,360,394
Limited Liability Company Unit (B)                                 1,647 uts.         07/07/09           98,833             --
                                                                                                   ------------     ------------
                                                                                                      1,316,250        1,360,394
                                                                                                   ------------     ------------
JASON, INC.
A diversified manufacturing company serving various industrial markets.
13% Senior Subordinated Note due 2010 (D)                        $    510,187         08/04/00          449,086           25,509
Limited Partnership Interest of
  Saw Mill Capital Fund II, L.P. (B)                               1.30% int.         08/03/00          469,308             --
                                                                                                   ------------     ------------
                                                                                                        918,394           25,509
                                                                                                   ------------     ------------
JUSTRITE MANUFACTURING ACQUISITION CO.
A manufacturer of safety products such as storage cabinets and containers.
12% Senior Subordinated Note due 2011                            $    843,750         12/15/04          828,112          843,750
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                 594 shs.         12/15/04           53,528          111,409
                                                                                                   ------------     ------------
                                                                                                        881,640          955,159
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              15


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
K H O F HOLDINGS, INC.
A manufacturer of premium disposable tableware products serving both the foodservice and consumer channels.
Common Stock (B)                                                 116,827 shs.         10/15/07     $     71,515     $     99,511
                                                                                                   ------------     ------------
K N B HOLDINGS CORPORATION
A designer, manufacturer and marketer of products for the custom framing market.
15.5% Senior Subordinated Note due 2013 (D)                      $  1,595,057         05/25/06        1,398,385        1,515,304
Common Stock (B)                                                  71,053 shs.         05/25/06           71,053             --
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                              43,600 shs.         05/25/06           37,871             --
                                                                                                   ------------     ------------
                                                                                                      1,507,309        1,515,304
                                                                                                   ------------     ------------
K P I HOLDINGS, INC.
The largest player in the U.S. non-automotive, non-ferrous die casting segment.
18% Senior Subordinated Note due 2014 (D)                        $  1,115,217         07/16/08        1,042,077        1,059,456
Convertible Preferred Stock Series C (B)                              29 shs.         06/30/09           29,348             --
Convertible Preferred Stock Series D (B)                              13 shs.         09/17/09           12,958             --
Common Stock (B)                                                     235 shs.         07/15/08          234,783             --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                 388 shs.                *           50,836             --
                                                                                                   ------------     ------------
* 07/16/08 and 09/17/09.                                                                              1,370,002        1,059,456
                                                                                                   ------------     ------------
K W P I HOLDINGS CORPORATION
A manufacturer and distributor of vinyl windows and patio doors throughout the northwestern United States.
18% Senior Subordinated Note due 2014 (D)                        $  1,555,404         03/14/07        1,415,638        1,244,323
Common Stock (B)                                                     123 shs.         03/13/07          123,000             --
Warrant, exercisable until 2019, to purchase
  preferred stock at $.01 per share (B)                               71 shs.         07/07/09             --               --
Warrant, exercisable until 2017, to purchase
  common stock at $.01 per share (B)                                  89 shs.         03/14/07           85,890             --
                                                                                                   ------------     ------------
                                                                                                      1,624,528        1,244,323
                                                                                                   ------------     ------------
L H D EUROPE HOLDINGS, INC.
A non-carbonated beverage dispensing company focused on the foodservice industry.
Common Stock (B)                                                      45 shs.         12/28/09            4,191           12,825
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
16


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
M V I HOLDING, INC.
A manufacturer of large precision machined metal components used in equipment which services a variety of industries, including
the oil and gas, mining, and defense markets.
13% Senior Subordinated Note due 2016                            $    656,154         09/12/08     $    608,288     $    634,794
Common Stock (B)                                                      32 shs.         09/12/08           32,143             --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                  35 shs.         09/12/08           34,714             --
                                                                                                   ------------     ------------
                                                                                                        675,145          634,794
                                                                                                   ------------     ------------
MAIL COMMUNICATIONS GROUP, INC.
A provider of mail processing and handling services, lettershop services, and commercial printing services.
12.5% Senior Subordinated Note due 2014                          $    516,177         05/04/07          483,072          516,177
Limited Liability Company Unit (B)                                12,763 uts.                *          166,481          170,202
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                               1,787 shs.         05/04/07           22,781           23,830
                                                                                                   ------------     ------------
* 05/04/07 and 01/02/08.                                                                                672,334          710,209
                                                                                                   ------------     ------------
MANHATTAN BEACHWEAR HOLDING COMPANY
A designer and distributor of women's swimwear.
12.5% Senior Subordinated Note due 2018                          $    882,353         01/15/10          775,154          900,000
Common Stock (B)                                                     118 shs.         01/15/10          117,647          111,768
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                 104 shs.         01/15/10           94,579                1
                                                                                                   ------------     ------------
                                                                                                        987,380        1,011,769
                                                                                                   ------------     ------------
MAVERICK ACQUISITION COMPANY
A manufacturer of capsules that cover the cork and neck of wine bottles.
6.79% Senior Secured Tranche A Note due 2011 (C)                 $     81,741         09/03/04           81,741           81,741
12.5% Senior Secured Tranche B Note due 2011                     $    179,104         09/03/04          174,338          179,104
6.79% Senior Secured Revolver due 2011 (C)                       $     44,777         09/03/04           44,777           44,777
Limited Partnership Interest (B)                                   4.48% int.         09/03/04           33,582           11,979
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                 243 shs.         09/03/04           22,556            8,655
                                                                                                   ------------     ------------
                                                                                                        356,994          326,256
                                                                                                   ------------     ------------
MBWS ULTIMATE HOLDCO, INC.
A provider of services throughout North Dakota that address the fluid management and related transportation needs of an oil well.
12% Senior Subordinated Note due 2016                            $    883,721         09/07/10          789,623          880,053
Preferred Stock Series A (B)                                       1,388 shs.         09/07/10          138,797          131,860
Common Stock (B)                                                     153 shs.         09/07/10           15,282           14,535
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                 386 shs.         09/07/10           38,623                4
                                                                                                   ------------     ------------
                                                                                                        982,325        1,026,452
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              17


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
MEDSYSTEMS HOLDINGS LLC
A manufacturer of enteral feeding products, such as feeding tubes and other products related to assisted feeding.
13% Senior Subordinated Note due 2015                            $    620,676         08/29/08     $    557,062     $    626,883
Preferred Unit (B)                                                    66 uts.         08/29/08           66,451           75,897
Common Unit Class A (B)                                              671 uts.         08/29/08              671             --
Common Unit Class B (B)                                              250 uts.         08/29/08           63,564             --
                                                                                                   ------------     ------------
                                                                                                        687,748          702,780
                                                                                                   ------------     ------------
MEGTEC HOLDINGS, INC.
A supplier of industrial and environmental products and services to a broad array of industries.
12% Senior Subordinated Note due 2016                            $  1,144,068         09/24/08        1,048,910        1,129,821
Preferred Stock (B)                                                   56 shs.         09/24/08           54,040             --
Limited Partnership Interest (B)                                   0.74% int.         09/16/08          205,932             --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                  18 shs.         09/24/08           18,237             --
                                                                                                   ------------     ------------
                                                                                                      1,327,119        1,129,821
                                                                                                   ------------     ------------
MICROGROUP, INC.
A manufacturer of precision parts and assemblies, and a value-added supplier of metal tubing and bars.
12% Senior Subordinated Note due 2013 (D)                        $  1,421,795                *        1,373,579        1,208,526
Common Stock (B)                                                     238 shs.                *          238,000             --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                  87 shs.                *           86,281             --
                                                                                                   ------------     ------------
* 08/12/05 and 09/11/06.                                                                              1,697,860        1,208,526
                                                                                                   ------------     ------------
MILWAUKEE GEAR COMPANY
A manufacturer of high-precision custom gears and gear drives used by original equipment manufacturers operating in a number of
industries.
13% Senior Subordinated Note due 2014                            $  1,246,154         07/21/08        1,184,076        1,121,539
Preferred Stock (B)                                                  139 shs.         07/21/08          138,374             --
Common Stock (B)                                                       9 shs.         07/21/08           10,000             --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                   6 shs.         07/21/08            5,510             --
                                                                                                   ------------     ------------
                                                                                                      1,337,960        1,121,539
                                                                                                   ------------     ------------
MOMENTUM HOLDING CO.
A designer and supplier of upholstery fabric to commercial furniture manufacturers and architectural and design firms.
Limited Partnership Interest (B)                                  11.24% int.         08/04/06           56,198          138,751
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                 586 shs.         08/04/06           56,705          144,632
                                                                                                   ------------     ------------
                                                                                                        112,903          283,383
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
18


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
MONESSEN HOLDING CORPORATION
A designer and manufacturer of a broad line of gas, wood, and electric hearth products and accessories.
14% Senior Subordinated Note due 2014 (D)                        $  1,350,000         07/25/08     $  1,279,360     $    675,000
14% PIK Note due 2014 (D)                                        $    419,713         07/25/08          342,435          209,856
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                  81 shs.         03/31/06           73,125             --
                                                                                                   ------------     ------------
                                                                                                      1,694,920          884,856
                                                                                                   ------------     ------------
NABCO, INC.
A producer of explosive containment vessels in the United States.
14% Senior Subordinated Note due 2014 (D)                        $    330,882         02/24/06          304,577             --
Limited Liability Company Unit (B)                                   437 uts.                *          436,984             --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                  68 shs.         02/24/06           19,687             --
                                                                                                   ------------     ------------
* 02/24/06 and 06/22/07.                                                                                761,248             --
                                                                                                   ------------     ------------
NAVIS GLOBAL
A designer, manufacturer, seller and servicer of finishing machinery for the knit and woven segments of the global textile industry.
10.75% Senior Secured Note due 2011 (D)                          $    397,479         05/28/04          393,979          377,605
14% Senior Subordinated Note due 2014 (D)                        $    780,219         05/28/04          664,277          195,055
                                                                                                   ------------     ------------
                                                                                                      1,058,256          572,660
                                                                                                   ------------     ------------
NESCO HOLDINGS CORPORATION
A sales and leasing company that provides equipment to the electric utility, telecommunications, and various other industries.
12% Senior Secured Subordinated Note due 2015                    $  1,125,000         08/02/07          999,658        1,125,000
Common Stock (B)                                                 225,000 shs.         08/02/07          225,000          352,945
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                              63,191 shs.         08/02/07          102,842           99,124
                                                                                                   ------------     ------------
                                                                                                      1,327,500        1,577,069
                                                                                                   ------------     ------------
NETSHAPE TECHNOLOGIES, INC.
A manufacturer of powder metal and metal injection molded precision components used in industrial, consumer, and other applications.
12% Senior Subordinated Note due 2014                            $    810,000         02/02/07          745,713          567,000
Limited Partnership Interest of
  Saw Mill PCG Partners LLC (B)                                    1.38% int.         02/01/07          539,990             --
Limited Liability Company Unit Class D of
  Saw Mill PCG Partners LLC (B)                                        8 uts.                *            8,147             --
Limited Liability Company Unit Class D-1 of
  Saw Mill PCG Partners LLC (B)                                       65 uts.         09/30/09           64,940             --
Preferred Stock Class A (B)                                             1 sh.         12/18/08              726             --
Preferred Stock Class A-1 (B)                                          6 shs.         09/30/09            5,635             --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                  48 shs.         02/02/07           48,087             --
                                                                                                   ------------     ------------
* 12/18/08 and 09/30/09.                                                                              1,413,238          567,000
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              19


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
NORTHWEST MAILING SERVICES, INC.
A producer of promotional materials for companies that use direct mail as part of their customer retention and loyalty programs.
12% Senior Subordinated Note due 2016                            $  1,492,105                *     $  1,221,384     $  1,528,342
Limited Partnership Interest (B)                                   1,724 uts.                *          174,006           79,500
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                               2,605 shs.                *          260,479          119,007
                                                                                                   ------------     ------------
* 07/09/09 and 08/09/10.                                                                              1,655,869        1,726,849
                                                                                                   ------------     ------------
NYLONCRAFT, INC.
A supplier of engineered plastic components for the automotive industry.
10% Senior Secured Note due 2012                                 $    464,286         01/28/02          464,286          441,072
15% Senior Subordinated Note due 2012 (D)                        $    285,714         01/28/02          270,653          271,428
Convertible Preferred Stock A (B)                                    571 shs.         01/28/02          549,507          254,740
Common Stock (B)                                                 178,571 shs.         01/28/02          178,571             --
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                             138,928 shs.         01/28/02           92,597             --
                                                                                                   ------------     ------------
                                                                                                      1,555,614          967,240
                                                                                                   ------------     ------------
O E C HOLDING CORPORATION
A provider of elevator maintenance, repair and modernization services.
13% Senior Subordinated Note due 2017                            $    444,445         06/04/10          405,339          453,630
Preferred Stock Series A (B)                                         554 shs.         06/04/10           55,354           52,586
Preferred Stock Series B (B)                                         311 shs.         06/04/10           31,125                3
Common Stock (B)                                                     344 shs.         06/04/10              344              327
                                                                                                   ------------     ------------
                                                                                                        492,162          506,546
                                                                                                   ------------     ------------
OAKRIVER TECHNOLOGY, INC.
Designs, engineers and assembles high precision automated process equipment for the medical device industry with a focus on
defibrilators and stents.
10% Senior Secured Note due 2012                                 $     45,982         01/03/06           45,292           45,982
13% Senior Subordinated Note due 2013                            $    392,709         01/03/06          366,606          392,709
Common Stock (B)                                                 184,176 shs.         01/03/06          184,176          137,926
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                              43,073 shs.         01/03/06           35,900           32,257
                                                                                                   ------------     ------------
                                                                                                        631,974          608,874
                                                                                                   ------------     ------------
OLYMPIC SALES, INC.
A boat retailer in Washington state, Oregon, California and British Columbia.
12% Senior Subordinated Note due 2010 (D)                        $    511,000         08/07/98          511,000           76,650
12% Senior Subordinated Note due 2010 (D)                        $    244,154         02/09/00          213,313           36,623
                                                                                                   ------------     ------------
                                                                                                        724,313          113,273
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
20


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
ONTARIO DRIVE & GEAR LTD.
A manufacturer of all-wheel drive, off-road amphibious vehicles and related accessories.
Limited Liability Company Unit (B)                                 1,942 uts.         01/17/06     $    302,885     $    359,364
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                 328 shs.         01/17/06           90,424           60,674
                                                                                                   ------------     ------------
                                                                                                        393,309          420,038
                                                                                                   ------------     ------------
P A S HOLDCO LLC
An independent provider of maintenance, repair and overhaul services to the aerospace gas turbine engine and airframe markets.
14% Senior Subordinated Note due 2014                            $  1,249,031         07/03/06        1,202,546        1,249,031
Preferred Unit (B)                                                   202 uts.         07/03/06          202,320          316,890
Preferred Unit (B)                                                    36 uts.         07/03/06           36,420           57,044
Common Unit Class I (B)                                               78 uts.         07/03/06             --            723,902
Common Unit Class L (B)                                               17 uts.         07/03/06             --            152,931
                                                                                                   ------------     ------------
                                                                                                      1,441,286        2,499,798
                                                                                                   ------------     ------------
P I I HOLDING CORPORATION
A manufacturer of plastic film and bags for the general industrial, medical, and food industries.
12% Senior Subordinated Note due 2013                            $  1,215,000         03/31/06        1,164,439        1,215,000
Preferred Stock (B)                                                   19 shs.         03/31/06          174,492          245,885
Common Stock (B)                                                      12 shs.         03/31/06           13,500          117,540
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                   7 shs.         03/31/06            5,888           68,395
                                                                                                   ------------     ------------
                                                                                                      1,358,319        1,646,820
                                                                                                   ------------     ------------
PACIFIC CONSOLIDATED HOLDINGS LLC
A manufacturer of rugged, mobile liquid and gaseous oxygen and nitrogen generating systems used in the global defense, oil and gas,
and medical sectors.
14% Senior Subordinated Note due 2012                            $    719,041         04/27/07          683,387          668,962
5% Senior Subordinated Note due 2012                             $     42,187         07/21/10           42,187           42,352
Preferred Shares Series E (B)                                     42,187 shs.         07/21/10             --               --
Limited Liability Preferred Unit (B)                             928,962 uts.         04/27/07           33,477             --
                                                                                                   ------------     ------------
                                                                                                        759,051          711,314
                                                                                                   ------------     ------------
PARADIGM PACKAGING, INC.
A manufacturer of plastic bottles and closures for the nutritional, pharmaceutical, personal care, and food packaging markets.
12% Senior Subordinated Note due 2011                            $  1,125,000         12/19/00        1,102,185        1,125,000
Membership Interests of MM/Lincap
  PPI Investments, Inc., LLC (B)                                   1.28% int.         12/21/00          140,625          139,772
                                                                                                   ------------     ------------
                                                                                                      1,242,810        1,264,772
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              21


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
PEARLMAN ENTERPRISES, INC.
A developer and distributor of tools, equipment and supplies to the natural and engineered stone industry.
Preferred Stock Series A (B)                                       1,236 shs.         05/22/09     $     59,034     $       --
Preferred Stock Series B (B)                                       7,059 shs.         05/22/09          290,050             --
Common Stock (B)                                                  21,462 shs.         05/22/09          993,816             --
                                                                                                   ------------     ------------
                                                                                                      1,342,900             --
                                                                                                   ------------     ------------
POSTLE ALUMINUM COMPANY LLC
A manufacturer and distributor of aluminum extruded products.
15% Senior Subordinated Note due 2013                            $    817,979         06/03/10          801,797          819,790
3% Senior Subordinated PIK Note due 2014 (D)                     $  1,209,017         10/02/06        1,066,355        1,148,566
Limited Liability Company Unit Class A (B)                           733 uts.         10/02/06          270,000             --
Limited Liability Company Unit (B)                                    76 uts.         05/22/09              340             --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                               4,550 shs.         10/02/06           65,988             --
                                                                                                   ------------     ------------
                                                                                                      2,204,480        1,968,356
                                                                                                   ------------     ------------
POWER SERVICES HOLDING COMPANY
A provider of industrial motor repair services, predictive and preventative maintenance, and performance improvement consulting
serving the petrochemical, mining, power generation, metals, and paper industries.
12% Senior Subordinated Note due 2016                            $  1,255,814         02/11/08        1,161,192        1,224,224
Limited Partnership Interest (B)                                  12.55% int.         02/11/08           94,092           10,310
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                 700 shs.         02/11/08           88,723           20,320
                                                                                                   ------------     ------------
                                                                                                      1,344,007        1,254,854
                                                                                                   ------------     ------------
PRECISION WIRE HOLDING COMPANY
A manufacturer of specialty medical wires that are used in non-elective minimally invasive surgical procedures.
14.25% Senior Subordinated Note due 2016                         $  1,368,089         11/12/09        1,229,892        1,405,946
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                 109 shs.         11/12/09          107,970                1
                                                                                                   ------------     ------------
                                                                                                      1,337,862        1,405,947
                                                                                                   ------------     ------------
QUALIS AUTOMOTIVE LLC
A distributor of aftermarket automotive brake and chassis products.
13% Senior Subordinated Note due 2013                            $    922,612         05/28/04          846,452          922,612
Common Stock (B)                                                 187,500 shs.         05/28/04          187,500          256,480
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                             199,969 shs.         05/28/04          199,969          273,537
                                                                                                   ------------     ------------
                                                                                                      1,233,921        1,452,629
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
22


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
R A J MANUFACTURING HOLDINGS LLC
A designer and manufacturer of women's swimwear sold under a variety of licensed brand names.
14.5% Senior Subordinated Note due 2014                          $  1,384,011         12/15/06     $  1,278,986     $  1,314,811
Limited Liability Company Unit (B)                                 1,497 uts.         12/15/06          149,723           57,757
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                   2 shs.         12/15/06           69,609           27,255
                                                                                                   ------------     ------------
                                                                                                      1,498,318        1,399,823
                                                                                                   ------------     ------------
R E I DELAWARE HOLDING, INC.
An engineer and manufacturer of highly complex, close tolerance components, assemblies, tooling and custom automation
equipment primarily for aerospace, medical and defense/radar markets.
12% Senior Subordinated Note due 2016                            $  1,350,000         01/18/08        1,306,541        1,358,372
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                   3 shs.         01/18/08           16,459            4,723
                                                                                                   ------------     ------------
                                                                                                      1,323,000        1,363,095
                                                                                                   ------------     ------------
ROYAL BATHS MANUFACTURING COMPANY
A manufacturer and distributor of acrylic and cultured marble bathroom products.
12.5% Senior Subordinated Note due 2011                          $    562,500         11/14/03          549,493          561,522
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                  74 shs.         11/14/03           65,089           81,481
                                                                                                   ------------     ------------
                                                                                                        614,582          643,003
                                                                                                   ------------     ------------
SAFETY SPEED CUT MANUFACTURING COMPANY, INC.
A manufacturer of vertical panel saws and routers for the woodworking industry.
Class B Common Stock (B)                                             846 shs.         06/02/99          146,456          164,253
                                                                                                   ------------     ------------
SAVAGE SPORTS HOLDING, INC.
A manufacturer of sporting firearms.
12% Senior Subordinated Note due 2012                            $    814,655         09/10/04          789,537          814,655
Preferred Stock Series A (B)                                      35,038 shs.         05/28/10           35,038           33,288
Common Stock (B)                                                     324 shs.                *          340,378          438,115
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                  71 shs.         09/10/04           60,129           95,655
                                                                                                   ------------     ------------
* 09/10/04 and 10/05/07.                                                                              1,225,082        1,381,713
                                                                                                   ------------     ------------
SENCORE HOLDING COMPANY
A designer, manufacturer, and marketer of decoders, receivers and modulators sold to broadcasters, satellite, cable and telecom
operators for encoding/decoding analog and digital transmission video signals.
12.5% Senior Subordinated Note due 2014                          $    934,615         01/15/09          832,226          794,423
Common Stock (B)                                                      69 shs.         01/15/09           69,231             --
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                 149 shs.         01/15/09          149,084             --
                                                                                                   ------------     ------------
                                                                                                      1,050,541          794,423
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              23


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
SMART SOURCE HOLDINGS LLC
A short-term computer rental company.
12% Senior Subordinated Note due 2015                            $  1,176,924                *     $  1,088,065     $  1,161,640
Limited Liability Company Unit (B)                                   328 uts.                *          334,371          220,664
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                  83 shs.                *           87,231           55,894
                                                                                                   ------------     ------------
* 08/31/07 and 03/06/08.                                                                              1,509,667        1,438,198
                                                                                                   ------------     ------------
SPARTAN FOODS HOLDING COMPANY
A manufacturer of branded pizza crusts and pancakes.
12.25% Senior Subordinated Note due 2017                         $  1,012,500         12/15/09          878,669        1,022,077
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                 136 shs.         12/15/09          120,234                1
                                                                                                   ------------     ------------
                                                                                                        998,903        1,022,078
                                                                                                   ------------     ------------
SPECIALTY COMMODITIES, INC.
A distributor of specialty food ingredients.
13.25% Senior Subordinated Note due 2016                         $  1,220,311         10/23/08        1,150,470        1,244,717
Common Stock (B)                                                  15,882 shs.         10/23/08          158,824          113,054
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                               5,852 shs.         10/23/08           53,285           41,657
                                                                                                   ------------     ------------
                                                                                                      1,362,579        1,399,428
                                                                                                   ------------     ------------
STANTON CARPET HOLDING CO.
A designer and marketer of high and mid-priced decorative carpets and rugs.
12.13% Senior Subordinated Note due 2014                         $  1,185,366         08/01/06        1,131,270        1,155,652
Common Stock (B)                                                     165 shs.         08/01/06          164,634           52,397
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                  55 shs.         08/01/06           49,390           17,451
                                                                                                   ------------     ------------
                                                                                                      1,345,294        1,225,500
                                                                                                   ------------     ------------
SUNDANCE INVESTCO LLC
A provider of post-production services to producers of movies and television shows.
Limited Liability Company Unit Class A (B)                         3,405 shs.         03/31/10             --               --
                                                                                                   ------------     ------------
SYNTERACT HOLDINGS CORPORATION
A provider of outsourced clinical trial management services to pharmaceutical and biotechnology companies.
14.5% Senior Subordinated Note due 2016                          $  1,381,270         09/02/08        1,298,257        1,395,083
Redeemable Preferred Stock Series A (B)                              678 shs.         09/02/08            6,629              144
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                               6,778 shs.         09/02/08           59,661             --
                                                                                                   ------------     ------------
                                                                                                      1,364,547        1,395,227
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
24


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
T H I ACQUISITION, INC.
A machine servicing company providing value-added steel services to long steel products.
12% Senior Subordinated Note due 2016                            $  1,350,000         01/14/08     $  1,276,383     $  1,080,000
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                   5 shs.         01/14/08           46,617             --
                                                                                                   ------------     ------------
                                                                                                      1,323,000        1,080,000
                                                                                                   ------------     ------------
TELECORPS HOLDINGS, INC.
A provider of equipment and services to producers of television shows and motion pictures.
12.75% Senior Subordinated Note due 2016                         $  1,681,677                *        1,474,695        1,429,425
Common Stock (B)                                                     143 shs.         09/02/09            5,823             --
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                               4,187 shs.                *          173,349             --
                                                                                                   ------------     ------------
* 05/20/09 and 09/02/09.                                                                              1,653,867        1,429,425
                                                                                                   ------------     ------------
TERRA RENEWAL LLC
A provider of wastewater residual management and required environmental reporting, permitting, nutrient management planning
and record keeping to companies involved in poultry and food processing.
12% Senior Subordinated Note due 2014                            $    664,062                *          639,934          542,358
6.79% Term Note due 2012 (C)                                     $    779,834                *          777,110          730,217
8.75% Term Note due 2012 (C)                                     $        830                *              830              777
Limited Partnership Interest of
  Saw Mill Capital Fund V, LLC (B)                                 2.27% int.               **           85,245             --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                  41 shs.         04/28/06           33,738             --
                                                                                                   ------------     ------------
* 04/28/06 and 09/13/06. ** 03/01/05 and 10/10/08.                                                    1,536,857        1,273,352
                                                                                                   ------------     ------------
TORRENT GROUP HOLDINGS, INC.
A contractor specializing in the sales and installation of engineered drywells for the retention and filtration of stormwater and
nuisance water flow.
14.5% Senior Subordinated Note due 2013 (D)                      $  1,185,366         10/26/07        1,113,016             --
Series B Preferred Stock (B)                                          97 shs.         03/31/10             --               --
Common Stock (B)                                                     273 shs.         03/31/10          219,203             --
                                                                                                   ------------     ------------
                                                                                                      1,332,219             --
                                                                                                   ------------     ------------
TOTAL E & S, INC.
A manufacturer of a wide variety of equipment used in the oil and gas industry.
10.5% Senior Secured Term Note due 2013                          $    486,487         03/02/07          479,190          462,163
13% Senior Subordinated Note due 2014 (D)                        $    341,971         03/02/07          280,347          170,986
                                                                                                   ------------     ------------
                                                                                                        759,537          633,149
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              25


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
TRANSPAC HOLDING COMPANY
A designer, importer, and wholesaler of home decor and seasonal gift products.
14% Senior Subordinated Note due 2015 (D)                        $    938,651         10/31/07     $    873,498     $    891,718
Common Stock (B)                                                     110 shs.         10/31/07          110,430            6,236
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                  50 shs.         10/31/07           46,380            2,816
                                                                                                   ------------     ------------
                                                                                                      1,030,308          900,770
                                                                                                   ------------     ------------
TRANSTAR HOLDING COMPANY
A distributor of aftermarket automotive transmission parts.
12% Senior Subordinated Note due 2014                            $    918,000         08/31/05          893,993          918,000
Common Stock (B)                                                     571 shs.                *          570,944          838,662
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                  46 shs.         08/31/05           41,021           66,836
                                                                                                   ------------     ------------
* 08/31/05 and 04/30/07.                                                                              1,505,958        1,823,498
                                                                                                   ------------     ------------
TRANZONIC COMPANIES (THE)
A producer of commercial and industrial supplies, such as safety products, janitorial supplies, work apparel, washroom and restroom
supplies and sanitary care products.
13% Senior Subordinated Note due 2010                            $  1,356,000         02/05/98        1,340,791        1,356,000
Common Stock (B)                                                     315 shs.         02/04/98          315,000          363,099
Warrant, exercisable until 2010, to purchase
  common stock at $.01 per share (B)                                 222 shs.         02/05/98          184,416          255,899
                                                                                                   ------------     ------------
                                                                                                      1,840,207        1,974,998
                                                                                                   ------------     ------------
TRUCK BODIES & EQUIPMENT INTERNATIONAL
A designer and manufacturer of accessories for heavy and medium duty trucks, primarily dump bodies, hoists, various forms of flatbed
bodies, landscape bodies and other accessories.
8% Senior Subordinated Note due 2011 (D)                         $  1,222,698                *        1,133,973        1,100,428
Preferred Stock Series B (B)                                         128 shs.         10/20/08          127,677             --
Common Stock (B)                                                     393 shs.                *          423,985             --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                  81 shs.                *           84,650             --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                 558 shs.         10/20/08             --               --
                                                                                                   ------------     ------------
* 07/19/05 and 12/22/05.                                                                              1,770,285        1,100,428
                                                                                                   ------------     ------------
TRUSTILE DOORS, INC.
A manufacturer and distributor of interior doors.
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                               3,060 shs.         04/11/03           36,032              578
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
26


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
U M A ENTERPRISES, INC.
An importer and wholesaler of home decor products.
15% Senior Subordinated Note due 2015                            $    952,932         02/08/08     $    932,336     $    952,338
Convertible Preferred Stock (B)                                      470 shs.         02/08/08          469,565          277,998
                                                                                                   ------------     ------------
                                                                                                      1,401,901        1,230,336
                                                                                                   ------------     ------------
U-LINE CORPORATION
A manufacturer of high-end, built-in, undercounter ice making, wine storage and refrigeration appliances.
14.5% Senior Subordinated Note due 2012                          $    996,500         04/30/04          960,332          946,675
14.5% PIK Note due 2012                                          $    221,640         10/06/09          196,646          210,558
Common Stock (B)                                                      96 shs.         04/30/04           96,400           29,782
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                 122 shs.         04/30/04          112,106           37,692
                                                                                                   ------------     ------------
                                                                                                      1,365,484        1,224,707
                                                                                                   ------------     ------------
VISIONEERING, INC.
A designer and manufacturer of tooling and fixtures for the aerospace industry.
10.5% Senior Secured Term Loan due 2013                          $    458,824         05/17/07          451,942          455,356
13% Senior Subordinated Note due 2014                            $    370,588         05/17/07          340,367          366,123
18% PIK Convertible Preferred Stock (B)                           21,361 shs.         03/13/09           41,440             --
Common Stock (B)                                                  70,588 shs.         05/17/07           70,588             --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                              20,003 shs.         05/17/07           31,460             --
                                                                                                   ------------     ------------
                                                                                                        935,797          821,479
                                                                                                   ------------     ------------
VITEX PACKAGING GROUP, INC.
A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags.
10% Senior Subordinated PIK Note due 2011                        $     89,626         10/29/09           83,079           85,145
5% Senior Subordinated PIK Note due 2011 (D)                     $    450,000         06/30/07          392,576          427,500
Class B Unit (B)                                                 406,525 uts.         10/29/09          184,266             --
Class C Unit (B)                                                 450,000 uts.         10/29/09          413,244          208,141
Limited Liability Company Unit Class A (B)                       383,011 uts.                *          229,353             --
Limited Liability Company Unit Class B (B)                        96,848 uts.         07/19/04           96,848             --
                                                                                                   ------------     ------------
* 07/19/04 and 10/29/09.                                                                              1,399,366          720,786
                                                                                                   ------------     ------------
WELLBORN FOREST HOLDING CO.
A manufacturer of semi-custom kitchen and bath cabinetry.
14.13% Senior Subordinated Note due 2014                         $    911,250         11/30/06          858,237          865,688
Common Stock (B)                                                     101 shs.         11/30/06          101,250           30,704
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                  51 shs.         11/30/06           45,790           15,329
                                                                                                   ------------     ------------
                                                                                                      1,005,277          911,721
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
                                                                                                                              27


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                               Principal Amount
                                                                Shares, Units
                                                                 or Ownership        Acquisition
CORPORATE RESTRICTED SECURITIES:(A)(Continued)                    Percentage            Date           Cost          Fair Value
                                                                 ------------         --------     ------------     ------------
                                                                                                        
WHEATON HOLDING CORPORATION
A distrtibutor and manufacturer of laboratory supply products and packaging.
13% Senior Subordinated Note due 2017                            $  1,000,000         06/08/10     $    911,591     $  1,016,848
Preferred Stock Series B (B)                                         703 shs.         06/08/10           70,308                7
Common Stock (B)                                                     353 shs.         06/08/10              353                4
                                                                                                   ------------     ------------
                                                                                                        982,252        1,016,859
                                                                                                   ------------     ------------
WORKPLACE MEDIA HOLDING CO.
A direct marketer specializing in providing advertisers with access to consumers in the workplace.
13% Senior Subordinated Note due 2015 (D)                        $    613,692         05/14/07          569,649          429,584
Limited Partnership Interest (B)                                  12.26% int.         05/14/07           61,308             --
Warrant, exercisable until 2015, to purchase
  common stock at $.02 per share (B)                                  47 shs.         05/14/07           44,186             --
                                                                                                   ------------     ------------
                                                                                                        675,143          429,584
                                                                                                   ------------     ------------
XALOY SUPERIOR HOLDINGS, INC.
A provider of melt processing components and ancillary equipment for both plastic injection molding and extrusion applications.
15.5% Senior Subordinated Note due 2015 (D)                      $  1,229,741         09/08/08        1,203,288          983,793
Common Stock (B)                                                     150 shs.         09/08/08          150,000             --
                                                                                                   ------------     ------------
                                                                                                      1,353,288          983,793
                                                                                                   ------------     ------------

TOTAL PRIVATE PLACEMENT INVESTMENTS (E)                                                             115,205,680      103,182,218
                                                                                                   ------------     ------------

--------------------------------------------------------------------------------------------------------------------------------
28


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                                         Shares or
                                                  Interest     Due       Principal                     Market
CORPORATE RESTRICTED SECURITIES:(A)(Continued)      Rate       Date        Amount         Cost         Value
                                                  -------    --------   ------------  ------------  ------------
                                                                                     
RULE 144A SECURITIES - 2.90%:

BONDS - 2.90%
Appleton Papers, Inc.                             11.250%    12/15/15   $    252,000  $    250,000  $    189,000
ArcelorMittal                                      6.125     06/01/18        500,000       519,176       540,758
C C O Holdings LLC                                 7.250     10/30/17        350,000       350,000       354,813
Cenveo Corporation                                10.500     08/15/16         45,000        45,000        46,012
Coffeyville Resources LLC                          9.000     04/01/15         70,000        69,658        73,850
CompuCom Systems, Inc.                            12.500     10/01/15        670,000       653,060       718,575
G F S I, Inc. (C)                                 10.500     06/01/11        358,000       343,948       358,000
Gannett Company, Inc.                              9.375     11/15/17         60,000        59,149        65,700
International Lease Finance Corporation            8.625     09/15/15         75,000        73,895        80,250
Lyondell Chemical Co.                              8.000     11/01/17        100,000       100,000       109,125
Magnachip Semiconductor                           10.500     04/15/18         95,000        95,245        98,562
NBC Universal                                      5.150     04/30/20        500,000       499,295       536,407
Sinclair Television Group, Inc.                    9.250     11/01/17        200,000       194,970       214,500
ViaSystems, Inc.                                  12.000     01/15/15        100,000        96,793       110,000
                                                                                      ------------  ------------
  TOTAL BONDS                                                                            3,350,189     3,495,552
                                                                                      ------------  ------------

CONVERTIBLE PREFERRED STOCK - 0.00%
ETEX Corporation (B)                                                             194           179          --
                                                                                      ------------  ------------
  TOTAL CONVERTIBLE PREFERRED STOCK                                                            179          --
                                                                                      ------------  ------------
PREFERRED STOCK - 0.00%
TherOX, Inc. (B)                                                                  26         1,032          --
                                                                                      ------------  ------------
  TOTAL PREFERRED STOCK                                                                      1,032          --
                                                                                      ------------  ------------
COMMON STOCK - 0.00%
Nortek, Inc. (B)                                                                 100             1         3,905
Touchstone Health Partnership (B)                                                292         1,062          --
                                                                                      ------------  ------------
  TOTAL COMMON STOCK                                                                         1,063         3,905
                                                                                      ------------  ------------

  TOTAL RULE 144A SECURITIES                                                             3,352,463     3,499,457
                                                                                      ------------  ------------

TOTAL CORPORATE RESTRICTED SECURITIES                                                 $118,558,143  $106,681,675
                                                                                      ------------  ------------

----------------------------------------------------------------------------------------------------------------
                                                                                                              29


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                  Interest     Due       Principal                    Market
CORPORATE PUBLIC SECURITIES - 15.81%: (A)           Rate       Date        Amount         Cost         Value
                                                  -------    --------   ------------  ------------  ------------
                                                                                     
BONDS - 15.35%
ACCO Brands Corporation                           10.625%    03/15/15   $     45,000  $     44,430  $     50,288
Affinia Group, Inc.                                9.000     11/30/14         25,000        24,250        25,750
Allegheny Technologies, Inc.                       9.375     06/12/19        500,000       520,626       604,286
Allied Waste NA                                    7.125     05/15/16        500,000       506,196       535,625
American General Finance Corporation               6.500     09/15/17        250,000       215,000       197,500
C R H America, Inc.                                5.300     10/15/13        500,000       418,430       536,692
Centurytel, Inc.                                   5.000     02/15/15        500,000       514,817       518,649
Citigroup, Inc.                                    5.500     04/11/13        500,000       437,890       536,422
Cytec Industries, Inc.                             8.250     11/15/19        600,000       603,676       754,972
Diversey, Inc.                                     8.950     07/01/17         45,000        44,627        48,150
Equifax, Inc.                                      4.450     12/01/14        500,000       516,460       532,611
Exide Corporation                                 10.500     03/15/13        250,000       252,240       255,625
GATX Corporation                                   4.750     05/15/15        500,000       512,612       531,693
Gencorp, Inc.                                      9.500     08/15/13        130,000       130,000       132,275
General Electric Capital Corporation               5.500     01/08/20        500,000       498,050       546,954
Goldman Sachs Group, Inc.                          4.750     07/15/13        500,000       418,645       536,822
Goodyear Tire & Rubber Co.                        10.500     05/15/16         50,000        48,219        56,625
Headwaters, Inc.                                  11.375     11/01/14         45,000        44,580        47,925
Intelsat Burmuda Ltd.                              9.250     06/15/16        690,000       713,577       733,125
International Game Technology                      7.500     06/15/19        500,000       499,720       594,210
International Lease Finance Corporation            5.875     05/01/13        500,000       448,188       500,000
Iron Mountain, Inc.                                8.750     07/15/18        500,000       512,068       530,625
J.C. Penney Company, Inc.                          7.950     04/01/17        500,000       554,735       561,250
Johnson Controls, Inc.                             5.500     01/15/16        500,000       398,125       566,589
Kraft Foods, Inc.                                  5.375     02/10/20        500,000       516,707       556,576
Manitowoc Company, Inc.                            7.125     11/01/13        100,000       100,000        99,750
Markwest Energy Operating Co.                      6.875     11/01/14         35,000        27,789        35,394
Masco Corporation                                  7.125     03/15/20        350,000       349,993       357,397
Morgan Stanley                                     5.500     01/26/20        500,000       497,305       513,925
Nortek, Inc.                                      11.000     12/01/13        100,444        98,956       106,722
Owens Corning, Inc.                                9.000     06/15/19         30,000        29,516        35,625
Pride International, Inc.                          6.875     08/15/20         30,000        30,000        32,475
Qwest Diagnostic, Inc.                             4.750     01/30/20        500,000       498,665       524,265
Rental Service Corporation                         9.500     12/01/14        175,000       175,617       181,343
Sealed Air Corporation                             7.875     06/15/17        500,000       492,897       541,690
Sheridan Acquisition Corporation                  10.250     08/15/11        225,000       222,001       223,031
Sprint Capital Corporation                         6.900     05/01/19        440,000       405,225       442,200
Teck Resources Ltd.                               10.750     05/15/19         30,000        28,605        37,779

----------------------------------------------------------------------------------------------------------------
30


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                                         Shares or
                                                  Interest     Due       Principal                    Market
CORPORATE PUBLIC SECURITIES:(A)(Continued)          Rate       Date        Amount         Cost         Value
                                                  -------    --------   ------------  ------------  ------------
                                                                                     
The Valspar Corporation                            7.250%    06/15/19   $    500,000  $    501,383  $    610,202
Ticketmaster Entertainment, Inc.                  10.750     07/28/16        250,000       250,000       273,750
Time Warner Cable, Inc.                            5.000     02/01/20        500,000       489,790       535,463
Titan International, Inc.                          8.000     01/15/12         70,000        70,000        75,250
Tube City IMS Corporation                          9.750     02/01/15      1,000,000       988,790     1,020,000
Tyco International Group SA                        8.500     01/15/19        500,000       457,495       584,802
Tyco International Group SA                        6.550     10/01/17        125,000       124,996       166,202
United Components, Inc.                            9.375     06/15/13        535,000       535,085       544,364
Verso Paper Holdings LLC                           9.125     08/01/14        500,000       486,875       501,250
W P P Finance Corporation                          5.875     06/15/14        500,000       507,224       554,010
                                                                                      ------------  ------------
  TOTAL BONDS                                                                           16,762,075    18,488,128
                                                                                      ------------  ------------

COMMON STOCK - 0.46%
CKX, Inc. (B)                                                                 52,500       422,625       257,250
Directed Electronics, Inc. (B)                                               195,118       982,867       146,339
Intrepid Potash, Inc. (B)                                                        185         5,920         4,823
ITC^DeltaCom, Inc. (B)                                                        94,588       827,645       130,531
Rue21, Inc. (B)                                                                  350         6,650         9,034
                                                                                      ------------  ------------
  TOTAL COMMON STOCK                                                                     2,245,707       547,977
                                                                                      ------------  ------------

TOTAL CORPORATE PUBLIC SECURITIES                                                     $ 19,007,782  $ 19,036,105
                                                                                      ------------  ------------

TOTAL INVESTMENTS                                 104.37%                             $137,565,925  $125,717,780
                                                                                      ============  ------------
  Other Assets                                      6.44                                               7,762,852
  Liabilities                                     (10.81)                                            (13,020,585)
                                                  ------                                            ------------
TOTAL NET ASSETS                                  100.00%                                           $120,460,047
                                                  ======                                            ============

(A) In each of the convertible note, warrant, convertible preferred and common stock investments, the issuer has
    agreed to provide certain registration rights.
(B) Non-income producing security.
(C) Variable rate security; rate indicated is as of 09/30/10.
(D) Defaulted security; interest not accrued.
(E) Illiquid security. As of September 30, 2010, the value of these securities amounted to $103,182,218 or
    85.66% of net assets.
PIK - Payment-in-kind

----------------------------------------------------------------------------------------------------------------
                                                                                                              31


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                 Fair Value/                                                            Fair Value/
INDUSTRY CLASSIFICATION:                        Market Value                                                           Market Value
                                               --------------                                                         --------------
                                                                                                             
AEROSPACE - 4.40%                                                      BUILDINGS & REAL ESTATE - 1.36%
A E Company, Inc.                              $    1,846,976          K W P I Holdings Corporation                   $    1,244,323
Gencorp, Inc.                                         132,275          Masco Corporation                                     357,397
P A S Holdco LLC                                    2,499,798          Owens Corning, Inc.                                    35,625
Visioneering, Inc.                                    821,479          TruStile Doors, Inc.                                      578
                                               --------------                                                         --------------
                                                    5,300,528                                                              1,637,923
                                               --------------                                                         --------------
AUTOMOBILE - 5.14%                                                     CHEMICAL, PLASTICS & RUBBER - 0.49%
Exide Corporation                                     255,625          Capital Specialty Plastics, Inc.                      587,055
Goodyear Tire & Rubber Co.                             56,625                                                         --------------
Jason, Inc.                                            25,509
Johnson Controls, Inc.                                566,589          CONSUMER PRODUCTS - 9.88%
Nyloncraft, Inc.                                      967,240          Aero Holdings, Inc.                                 1,971,104
Ontario Drive & Gear Ltd.                             420,038          Bravo Sports Holding Corporation                    1,322,001
Qualis Automotive LLC                               1,452,629          Custom Engineered Wheels, Inc.                      1,374,923
Titan International, Inc.                              75,250          G F S I, Inc.                                         358,000
Transtar Holding Company                            1,823,498          Johnson Diversey, Inc.                                 48,150
United Components, Inc.                               544,364          K N B Holdings Corporation                          1,515,304
                                               --------------          Manhattan Beachwear Holding Company                 1,011,769
                                                    6,187,367          Momentum Holding Co.                                  283,383
                                               --------------          R A J Manufacturing Holdings LLC                    1,399,823
BEVERAGE, DRUG & FOOD - 6.09%                                          Royal Baths Manufacturing Company                     643,003
Eatem Holding Company                               1,023,022          The Tranzonic Companies                             1,974,998
F F C Holding Corporation                             990,096                                                         --------------
Golden County Foods Holding, Inc.                   1,207,177                                                             11,902,458
Hospitality Mints Holding Company                   1,119,209                                                         --------------
Kraft Foods, Inc.                                     556,576          CONTAINERS, PACKAGING & GLASS - 3.95%
L H D Europe Holding, Inc.                             12,825          Flutes, Inc.                                          262,396
Spartan Foods Holding Company                       1,022,078          Maverick Acquisition Company                          326,256
Specialty Commodities, Inc.                         1,399,428          P I I Holding Corporation                           1,646,820
                                               --------------          Paradigm Packaging, Inc.                            1,264,772
                                                    7,330,411          Sealed Air Corporation                                541,690
                                               --------------          Vitex Packaging Group, Inc.                           720,786
BROADCASTING & ENTERTAINMENT - 2.39%                                                                                  --------------
C C O Holdings LLC                                    354,813                                                              4,762,720
CKX, Inc.                                             257,250                                                         --------------
NBC Universal                                         536,407          DISTRIBUTION - 1.81%
Sinclair Television Group, Inc.                       214,500          Duncan Systems, Inc.                                  842,962
Time Warner Cable, Inc.                               535,463          F C X Holdings Corporation                          1,337,944
WPP Finance Corporation                               554,010                                                         --------------
Workplace Media Holding Co.                           429,584                                                              2,180,906
                                               --------------                                                         --------------
                                                    2,882,027
                                               --------------


------------------------------------------------------------------------------------------------------------------------------------
32


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                 Fair Value/                                                            Fair Value/
INDUSTRY CLASSIFICATION:                        Market Value                                                           Market Value
                                               --------------                                                         --------------
                                                                                                             
DIVERSIFIED/CONGLOMERATE,                                              ELECTRONICS - 1.09%
MANUFACTURING - 9.33%                                                  Barcodes Group, Inc.                           $      779,360
A H C Holdings Company, Inc.                   $    1,567,332          Connecticut Electric, Inc.                            385,526
Arrow Tru-Line Holdings, Inc.                         853,187          Directed Electronics, Inc.                            146,339
C D N T, Inc.                                         784,045                                                         --------------
Headwaters, Inc.                                       47,925                                                              1,311,225
K P I Holdings, Inc.                                1,059,456                                                         --------------
MEGTEC Holdings, Inc.                               1,129,821          FINANCIAL SERVICES - 2.86%
Milwaukee Gear Company                              1,121,539          American General Finance Corporation                  197,500
Nortek, Inc.                                          110,627          Citigroup, Inc.                                       536,422
O E C Holding Corporation                             506,546          GATX Corporation                                      531,693
Postle Aluminum Company LLC                         1,968,356          General Electric Capital Corporation                  546,954
Truck Bodies & Equipment International              1,100,428          Goldman Sachs Group, Inc.                             536,822
Xaloy Superior Holdings, Inc.                         983,793          Highgate Capital LLC                                     --
                                               --------------          International Lease Finance Corporation               580,250
                                                   11,233,055          Morgan Stanley                                        513,925
                                               --------------                                                         --------------
DIVERSIFIED/CONGLOMERATE, SERVICE - 12.94%                                                                                 3,443,566
A S C Group, Inc.                                   1,380,701                                                         --------------
A W X Holdings Corporation                            315,000          HEALTHCARE, EDUCATION & CHILDCARE - 4.22%
ACCO Brands Corporation                                50,288          American Hospice Management Holding LLC             2,152,153
Advanced Technologies Holdings                      1,456,151          F H S Holdings LLC                                       --
Affinia Group, Inc.                                    25,750          Qwest Diagnostic, Inc.                                524,265
Apex Analytix Holding Corporation                   1,401,005          Synteract Holdings Corporation                      1,395,227
Associated Diversified Services                       694,419          Touchstone Health Partnership                            --
C R H America, Inc.                                   536,692          Wheaton Holdings Corporation                        1,016,859
Clough, Harbour and Associates                      1,441,508                                                         --------------
Crane Rental Corporation                            1,212,223                                                              5,088,504
Diversco, Inc./DHI Holdings, Inc.                     236,518                                                         --------------
Dwyer Group, Inc.                                     830,058          HOME & OFFICE FURNISHINGS, HOUSEWARES,
Equifax, Inc.                                         532,611          & DURABLE CONSUMER PRODUCTS - 8.62%
Insurance Claims Management, Inc.                     181,594          Connor Sport Court International, Inc.              1,384,051
Iron Mountain, Inc.                                   530,625          H M Holding Company                                   272,025
Mail Communications Group, Inc.                       710,209          Home Decor Holding Company                          1,302,169
Nesco Holdings Corporation                          1,577,069          Justrite Manufacturing Acquisition Co.                955,159
Northwest Mailing Services, Inc.                    1,726,849          K H O F Holdings, Inc.                                 99,511
Pearlman Enterprises, Inc.                               --            Monessen Holding Corporation                          884,856
Tyco International Group                              751,004          Stanton Carpet Holding Co.                          1,225,500
                                               --------------          Transpac Holdings Company                             900,770
                                                   15,590,274          U M A Enterprises, Inc.                             1,230,336
                                               --------------          U-Line Corporation                                  1,224,707
                                                                       Wellborn Forest Holding Co.                           911,721
                                                                                                                      --------------
                                                                                                                          10,390,805
                                                                                                                      --------------

------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                  33


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                 Fair Value/                                                            Fair Value/
INDUSTRY CLASSIFICATION:                        Market Value                                                           Market Value
                                               --------------                                                         --------------
                                                                                                             
LEISURE, AMUSEMENT, ENTERTAINMENT - 1.86%                              NATURAL RESOURCES - 2.29%
International Game Technology                  $      594,210          Appleton Papers, Inc.                          $      189,000
Savage Sports Holding, Inc.                         1,381,713          ArcelorMittal                                         540,758
Ticketmaster Entertainment, Inc.                      273,750          Cenveo Corporation                                     46,012
                                               --------------          Cytec Industries, Inc.                                754,972
                                                    2,249,673          Intrepid Potash, Inc.                                   4,823
                                               --------------          Lyondell Chemical Co.                                 109,125
MACHINERY - 7.26%                                                      The Valspar Corporation                               610,202
A S A P Industries LLC                                677,667          Verso Paper Holdings LLC                              501,250
Davis-Standard LLC                                  1,418,726                                                         --------------
E S P Holdco, Inc.                                  1,284,220                                                              2,756,142
M V I Holding, Inc.                                   634,794                                                         --------------
Manitowoc Company, Inc.                                99,750          OIL & GAS - 2.60%
Navis Global                                          572,660          Coffeyville Resources LLC                              73,850
NetShape Technologies, Inc.                           567,000          International Offshore Services LLC                 1,360,394
Pacific Consolidated Holdings LLC                     711,314          MBWS Ultimate Holdco, Inc.                          1,026,452
Power Services Holding Company                      1,254,854          Pride International, Inc.                              32,475
R E I Delaware Holding, Inc.                        1,363,095          Total E & S, Inc.                                     633,149
Safety Speed Cut Manufacturing Company, Inc.          164,253                                                         --------------
                                               --------------                                                              3,126,320
                                                    8,748,333                                                         --------------
                                               --------------          PHARMACEUTICALS - 1.23%
MEDICAL DEVICES/BIOTECH - 3.88%                                        CorePharma LLC                                      1,477,518
Coeur, Inc.                                           707,298                                                         --------------
E X C Acquisition Corporation                          40,585          PUBLISHING/PRINTING - 0.24%
ETEX Corporation                                         --            Gannett Company, Inc.                                  65,700
MedSystems Holdings LLC                               702,780          Sheridan Acquisition Corporation                      223,031
MicroGroup, Inc.                                    1,208,526                                                         --------------
OakRiver Technology, Inc.                             608,874                                                                288,731
Precision Wire Holding Company                      1,405,947                                                         --------------
TherOX, Inc.                                             --            RETAIL STORES - 0.72%
                                               --------------          J. C. Penney Company, Inc.                            561,250
                                                    4,674,010          Olympic Sales, Inc.                                   113,273
                                               --------------          Rental Service Corporation                            181,343
MINING, STEEL, IRON & NON-PRECIOUS                                     Rue21, Inc.                                             9,034
METALS - 2.28%                                                                                                        --------------
Allegheny Technology, Inc.                            604,286                                                                864,900
T H I Acquisition, Inc.                             1,080,000                                                         --------------
Teck Resources, Ltd.                                   37,779          TECHNOLOGY - 2.62%
Tube City IMS Corporation                           1,020,000          Compucom Systems, Inc.                                718,575
                                               --------------          Magnachip Semiconductor                                98,562
                                                    2,742,065          Sencore Holding Company                               794,423
                                               --------------          Smart Source Holdings LLC                           1,438,198
                                                                       ViaSystems, Inc.                                      110,000
                                                                                                                      --------------
                                                                                                                           3,159,758
                                                                                                                      --------------

------------------------------------------------------------------------------------------------------------------------------------
34


                                              MassMutual Participation Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
September 30, 2010
(Unaudited)

                                                 Fair Value/                                                            Fair Value/
INDUSTRY CLASSIFICATION:                        Market Value                                                           Market Value
                                               --------------                                                         --------------
                                                                                                             
TELECOMMUNICATIONS - 3.29%
All Current Holding Company                    $      703,205
Centurytel, Inc.                                      518,649
Intelsat Bermuda Ltd.                                 733,125
ITC^DeltaCom, Inc.                                    130,531
Spirit Capital Corporation                            442,200
Sundance Investco LLC                                    --
Telecorps Holdings, Inc.                            1,429,425
                                               --------------
                                                    3,957,135
                                               --------------
TRANSPORTATION - 0.0%
NABCO, Inc.                                              --
                                               --------------
UTILITIES - .03%
Markwest Energy Operating Co.                          35,394
                                               --------------
WASTE MANAGEMENT / POLLUTION - 1.50%
Allied Waste NA                                       535,625
Terra Renewal LLC                                   1,273,352
Torrent Group Holdings, Inc.                             --
                                                    1,808,977
                                               --------------

TOTAL INVESTMENTS - 104.37%                    $  125,717,780
                                               ==============











See Notes to Consolidated Financial Statements
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                  35


INCOME TAX INFORMATION

The  aggregate  cost  of  investments  is  substantially  the same for financial
reporting  and  Federal  income  tax  purposes as of September 30, 2010. The net
unrealized  depreciation  of investments for financial reporting and Federal tax
purposes  as  of  September  30, 2010 is $11,848,145 and consists of $12,106,802
appreciation and $23,954,947 depreciation.

FAIR VALUE MEASUREMENTS

In  accordance  with  the  authoritative guidance on fair value measurements and
disclosures  under accounting principles generally accepted in the United States
of  America ("U.S. GAAP"), the Trust discloses the fair value of its investments
in  a  hierarchy  that  prioritizes  the  inputs to valuation techniques used to
measure  the  fair value. The hierarchy gives the highest priority to valuations
based  upon  unadjusted  quoted prices in active markets for identical assets or
liabilities  (level  1  measurement) and the lowest priority to valuations based
upon  unobservable  inputs  that  are  significant  to  the  valuation  (level 3
measurements). The guidance establishes three levels of the fair value hierarchy
as follows:

     Level 1: quoted prices in active markets for identical securities

     Level 2: other significant observable inputs (including quoted prices for
              similar securities, interest rates, prepayment speeds, credit
              risk, etc.)

     Level 3: significant unobservable inputs (including the Trust's own
              assumptions in determining the fair value of investments)

The  inputs  and  methodology used for valuing securities are not necessarily an
indication of the risk associated with investing in those securities.

The following is a summary of the inputs used to value the Trust's net assets as
of September 30, 2010:

 ASSETS                        TOTAL      LEVEL 1      LEVEL 2      LEVEL 3
 -------------------------------------------------------------------------------
 Restricted Securities
  Corporate Bonds        $ 90,563,786   $     --     $  3,495,552   $ 87,068,234
  Common Stock - U.S.       8,377,394         --            3,905      8,373,489
  Preferred Stock           3,546,788         --             --        3,546,788
  Partnerships and LLCs     4,193,707         --             --        4,193,707
 Public Securities
  Corporate Bonds          18,488,128         --       18,488,128           --
  Common Stock - U.S.         547,977      547,977           --             --
  Preferred Stock                --           --             --             --
  Short-term Securities          --           --             --             --
 -------------------------------------------------------------------------------
  Total                  $125,717,780   $  547,977   $ 21,987,585   $103,182,218

Following   is  a  reconciliation  of  Level  3  assets  for  which  significant
unobservable inputs were used to determine fair value:

                                                                                                                    Unrealized
                                                     Total gains     Purchases,                                   gains & losses
                                    Beginning         or losses   sales, issuances Transfers in       Ending       in net income
                                     balance          (realized/    & settlements      and/or        balance at     from assets
Assets:                           at 12/31/2009       unrealized)       (net)      out of Level 3    09/30/2010      still held
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                  
Restricted Securities
Corporate Bonds                    $81,465,949      $ 3,337,086       $ 2,265,199    $     --      $ 87,068,234     $ 2,187,864
Common Stock - U.S.                  7,767,378        1,138,392          (532,281)                    8,373,489       1,329,343
Preferred Stock                      3,468,130        1,319,134        (1,240,476)                    3,546,788         156,498
Partnerships and LLCs                3,536,247        1,472,509          (815,049)                    4,193,707         924,338
---------------------------------------------------------------------------------------------------------------------------------
                                   $96,237,704      $ 7,267,121        $ (322,607)   $     --      $103,182,218     $ 4,598,043
---------------------------------------------------------------------------------------------------------------------------------




ITEM 2. CONTROLS AND PROCEDURES.

         (a) The principal executive officer and principal financial officer of
the Registrant evaluated the effectiveness of the Registrant's disclosure
controls and procedures (as defined in Rule 30a-3(c) under the Investment
Company Act of 1940 (the "Act") as of a date within 90 days of the filing date
of this report and based on that evaluation have concluded that such disclosure
controls and procedures are effective to provide reasonable assurance that
material information required to be disclosed by the Registrant on Form N-Q is
recorded, processed, summarized and reported within the time periods specified
in the Securities and Exchange Commission's rules and forms.

         (b) There were no changes in the Registrant's internal control over
financial reporting (as defined in Rule 30a-3(d) under the Act) that occurred
during the Registrant's last fiscal quarter that has materially affected, or are
reasonably likely to materially affect, the Registrant's internal control over
financial reporting.


ITEM 3. EXHIBITS.

         Certifications pursuant to Rule 30a-2(a) under the Investment Company
Act of 1940 (17 CFR 270.30a-2(a)) are attached hereto as an exhibit.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the Registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant) MassMutual Participation Investors
             ----------------------------------


By (Signature and Title)* /s/ Michael L. Klofas
                          ---------------------------------------------
                          Michael L. Klofas, President


Date     November 29, 2010
     ------------------------------------------------------------------



Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the Registrant and in the capacities and on the
dates indicated.

By (Signature and Title)* /s/ Michael L. Klofas
                          ---------------------------------------------
                          Michael L. Klofas, President


Date     November 29, 2010
     ------------------------------------------------------------------



By (Signature and Title)* /s/ James M. Roy
                          ---------------------------------------------
                          James M. Roy, Vice President and
                          Chief Financial Officer


Date     November 29, 2010
     ------------------------------------------------------------------

* PRINT THE NAME AND TITLE OF EACH SIGNING OFFICER UNDER HIS OR HER SIGNATURE.