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

                                   FORM N-CSR

              CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT
                              INVESTMENT COMPANIES

Investment Company Act file number   811-2183
                                   ---------------------------------------------



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


          1500 Main Street, P.O. Box 15189, Springfield, MA 01115-5189
--------------------------------------------------------------------------------
              (Address of principal executive offices) (Zip code)


      Patricia J. Walsh, Vice President, Secretary and Chief Legal Officer
    1500 Main Street, Suite 2800, P.O. Box 15189, Springfield, MA 01115-5189
--------------------------------------------------------------------------------
                    (Name and address of agent for service)

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

Date of fiscal year end:  12/31
                          ------------------

Date of reporting period: 06/30/10
                          ------------------

Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the transmission to stockholders of
any report that is required to be transmitted to stockholders under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-CSR
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 100 F Street NE,
Washington, DC 20549. The OMB has reviewed this collection of information under
the clearance requirements of 44 U.S.C. ss. 3507.


ITEM 1.  REPORT TO STOCKHOLDERS.

         Attached hereto is the semi-annual shareholder report transmitted to
         shareholders pursuant to Rule 30e-1 of the Investment Company Act of
         1940, as amended.







                                                                      MASSMUTUAL
                                                             CORPORATE INVESTORS

                                                                  REPORT FOR THE
                                                  SIX MONTHS ENDED JUNE 30, 2010



                                                                          [LOGO]












ADVISER
Babson Capital Management LLC *
1500 Main Street, P.O. Box 15189
Springfield, Massachusetts 01115-5189

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
KPMG LLP
Boston, Massachusetts 02110

COUNSEL TO THE TRUST
Ropes & Gray LLP
Boston, Massachusetts 02110

CUSTODIAN
Citibank, N.A.
New York, New York 10043

TRANSFER AGENT & REGISTRAR
Shareholder Financial Services, Inc. *
P.O. Box 173673
Denver, Colorado 80217-3673
1-800-647-7374

INTERNET WEBSITE
www.babsoncapital.com/mci
            MassMutual Corporate Investors
            c/o Babson Capital Management LLC
[LOGO]      1500 Main Street, Suite 2200
            Springfield, Massachusetts 01115
            (413) 226-1516

*Member of the MassMutual Financial Group
---------------------------------------------------------------------------

INVESTMENT OBJECTIVE AND POLICY

MassMutual   Corporate  Investors  (the  "Trust")  is  a  closed-end  management
investment company, first offered to the public in 1971, whose shares are traded
on the New York Stock Exchange under the trading symbol "MCI". The Trust's share
price  can  be  found in the financial section of most newspapers as "MassCp" or
"MassMuInv" under either the New York Stock Exchange listings or Closed-End Fund
Listings.

The  Trust's  investment  objective  is  to  maintain  a portfolio of securities
providing a fixed yield and at the same time offering an opportunity for capital
gains.  The Trust's principal investments are privately placed, below-investment
grade,  long-term  debt  obligations  with equity features such as common stock,
warrants,  conversion  rights,  or  other  equity  features  and,  occasionally,
preferred stocks. The Trust typically purchases these investments, which are not
publicly   tradable,   directly   from   their   issuers  in  private  placement
transactions.  These  investments  are typically mezzanine debt instruments with
accompanying private equity securities made to small or middle market companies.
In  addition,  the Trust may temporarily invest, subject to certain limitations,
in marketable investment grade debt securities, other marketable debt securities
(including high yield securities) and marketable common stocks. Below-investment
grade  or  high  yield securities have predominantly speculative characteristics
with respect to the capacity of the issuer to pay interest and repay principal.

Babson  Capital  Management  LLC ("Babson Capital") manages the Trust on a total
return  basis.  The  Trust  distributes  substantially  all of its net income to
shareholders each year. Accordingly, the Trust pays dividends to shareholders in
January, May, August, and November. The Trust pays dividends to its shareholders
in   cash,  unless  the  shareholder  elects  to  participate  in  the  Dividend
Reinvestment and Share Purchase Plan.

FORM  N-Q  The  Trust files its complete schedule of portfolio holdings with the
U.S. Securities and Exchange Commission ("SEC") for the first and third quarters
of  each fiscal year on Form N-Q. This information is available (i) on the SEC's
website  at  http://www.sec.gov;  and (ii) at the SEC's Public Reference Room in
Washington,  DC (which information on their operation may be obtained by calling
1-800-SEC-0330).   A   complete  schedule  of  portfolio  holdings  as  of  each
quarter-end is available upon request by calling, toll-free, 866-399-1516.

PROXY VOTING POLICIES & PROCEDURES; PROXY VOTING RECORD
The  Trustees of the Trust have delegated proxy voting responsibilities relating
to  the  voting of securities held by the Trust to Babson Capital. A description
of  Babson  Capital's  proxy  voting  policies  and  procedures is available (1)
without  charge,  upon  request,  by calling, toll-free 866-399-1516; (2) on the
Trust's  website: http://www.babsoncapital.com/mci; and (3) on the SEC's website
at  http://www.sec.gov.  Information  regarding  how  the  Trust  voted  proxies
relating  to  portfolio  securities during the most recent 12-month period ended
June  30  is  available  (1)  on  the Trust's website: http://www.babsoncapital.
com/mci; and (2) on the SEC's website at http://www.sec.gov.

MCI
Listed
NYSE

                                                  MassMutual Corporate Investors
TO OUR SHAREHOLDERS

July 31, 2010
We  are  pleased  to  present  the  June 30, 2010 Quarterly Report of MassMutual
Corporate Investors (the "Trust").

The  Board  of  Trustees  declared  a  quarterly dividend of 54 cents per share,
payable  on  August  13,  2010  to shareholders of record on August 2, 2010. The
Trust  paid  a  54  cent per share dividend for the preceding quarter. The Trust
earned  54  cents  per  share of net investment income for the second quarter of
2010, compared to 52 cents per share in the previous quarter.

During the second quarter, the net assets of the Trust increased to $226,229,994
or  $24.03  per  share compared to $220,735,765 or $23.50 per share on March 31,
2010.  This  translates  into  a 4.6% total return for the quarter, based on the
change  in  the  Trust's  net assets assuming the reinvestment of all dividends.
Longer  term, the Trust returned 15.8%, 4.2%, 9.1%, 10.1%, and 13.8% for the 1-,
3-,  5-, 10-, and 25-year time periods, respectively, based on the change in the
Trust's net assets assuming the reinvestment of all dividends.

The  Trust's  market  price  decreased  0.2% during the quarter, from $26.85 per
share  as of March 31, 2010 to $26.23 per share as of June 30, 2010. The Trust's
market  price  of  $26.23  per share equates to a 9.2% premium over the June 30,
2010  net  asset  value  per  share  of  $24.03. The Trust's average quarter-end
premium  for  the  3-,  5-,  and  10-year  periods  was  4.1%,  9.3%  and  7.6%,
respectively.  U.S.  equity  markets, as approximated by the Russell 2000 Index,
decreased  9.9%  for  the quarter. U.S. fixed income markets, as approximated by
the  Barclays  Capital  U.S.  Corporate High Yield Index, decreased 0.1% for the
quarter.

The  Trust  closed  two  new  private  placement  investments  during the second
quarter.  The two new investments were in O E C Holdings Corporation and Wheaton
Holding  Corporation.  A  brief description of these investments can be found in
the Consolidated Schedule of Investments. The total amount invested by the Trust
in these two transactions was $4,500,000.

The  amount of debt and equity capital available to finance middle market buyout
transactions  continued  to  increase during the second quarter. As a result, we
saw  an  improving level of deal flow as the quarter progressed. Our contacts in
the  private equity and investment banking community indicate they currently are
very busy processing a large number of potential transactions, so we expect deal
flow  during  the  remainder  of  2010 to be very robust. Hopefully, this higher
level  of deal flow translates into a number of new investments for the Trust in
the  second  half of the year. Leverage multiples continued to expand during the
quarter  as capital providers aggressively pursued deal opportunities. We expect
leverage  multiples  to  continue  to  increase during the rest of the year. The
downward  pressure  on  pricing  and  return  expectations  moderated during the
quarter  and  we  expect a relatively stable pricing environment for the rest of
the year. As I have stated in prior quarters, despite constantly changing market
conditions,  our  approach  to  investing  will  not change. We will continue to
maintain  the  same  discipline  and  investment  philosophy that has served our
shareholders well for so many years.

As  the  economy  continued  to  rebound  during the second quarter, the overall
condition  of  our  portfolio  continued to improve as well. It was particularly
refreshing  to  see  many  of  our  under  performing  companies start to report
increased  sales and earnings. In several situations where we had been deferring
interest  on our subordinated notes, performance improved to the point where the
portfolio  company  was  able  to  resume  paying  cash  interest  on our notes.
Realization   activity,   which   generally   correlates  highly  with  improved
performance,  also  increased  as  the quarter progressed. We had two companies,
Diversco,  Inc.  and K-Tek Holding Corporation, successfully sold in early July.
There  continues  to  be a significant number of portfolio companies that are in
various stages of a sale process and we are hopeful that many of these will turn
into successful realizations in the upcoming quarters.

Thank  you  for  your  continued interest in and support of MassMutual Corporate
Investors.

Sincerely,

/s/ Michael L. Klofas

Michael L. Klofas
President

                            [PIE CHART APPEARS HERE]
                     Portfolio Composition as of 6/30/10 *

Private / 144A High                     Public High Yield
Yield Debt                              Debt
69.9%                                   15.0%

Private / Restricted                    Public Equity
Equity                                  0.8%
12.1%

Cash & Short Term
Investments
2.2%

* Based on market value of total investments (including cash)
Cautionary  Notice:  Certain statements contained in this report may be "forward
looking"  statements.  Investors  are  cautioned  not to place undue reliance on
forward-looking  statements,  which  speak only as of the date on which they are
made and which reflect management's current estimates, projections, expectations
or  beliefs,  and  which  are  subject to risks and uncertainties that may cause
actual  results  to differ materially. These statements are subject to change at
any  time  based upon economic, market or other conditions and may not be relied
upon  as  investment  advice  or  an  indication  of the Trust's trading intent.
References  to  specific  securities are not recommendations of such securities,
and  may  not be representative of the Trust's current or future investments. We
undertake  no  obligation to publicly update forward looking statements, whether
as a result of new information, future events, or otherwise.
--------------------------------------------------------------------------------
                                                                               1

CONSOLIDATED STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2010
(UNAUDITED)


                                                                                   
ASSETS:
Investments
        (See Consolidated Schedule of Investments)
  Corporate restricted securities at fair value
        (Cost - $219,892,503)                                                         $191,058,029
  Corporate restricted securities at market value
        (Cost - $ 15,478,665)                                                           15,040,974
  Corporate public securities at market value
        (Cost - $ 42,995,158)                                                           39,610,801
  Short-term securities at amortized cost                                                4,249,817
                                                                                      ------------
                                                                                       249,959,621
Cash                                                                                     1,208,586
Interest and dividends receivable                                                        5,962,930
Receivable for investments sold                                                            329,500
Other assets                                                                                12,571
                                                                                      ------------
        TOTAL ASSETS                                                                   257,473,208
                                                                                      ------------

LIABILITIES:
Investment advisory fee payable                                                            706,969
Note payable                                                                            30,000,000
Interest payable                                                                           202,105
Accrued expenses                                                                           127,881
Accrued taxes payable                                                                      145,855
Other payables                                                                              60,404
                                                                                      ------------
TOTAL LIABILITIES                                                                       31,243,214
                                                                                      ------------
TOTAL NET ASSETS                                                                      $226,229,994
                                                                                      ============

NET ASSETS:
Common shares, par value $1.00 per share; an unlimited number authorized              $  9,415,079
Additional paid-in capital                                                             114,965,361
Retained net realized gain on investments, prior years                                 127,688,004
Undistributed net investment income                                                      7,175,870
Accumulated net realized loss on investments                                              (211,943)
Net unrealized depreciation of investments                                             (32,802,377)
                                                                                      ------------
TOTAL NET ASSETS                                                                      $226,229,994
                                                                                      ============
COMMON SHARES ISSUED AND OUTSTANDING                                                     9,415,079
                                                                                      ============
NET ASSET VALUE PER SHARE                                                             $      24.03
                                                                                      ============



See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
2

                                                  MassMutual Corporate Investors

CONSOLIDATED STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 2010
(UNAUDITED)


                                                                                   
INVESTMENT INCOME:
Interest                                                                              $12,300,629
Dividends                                                                                  72,307
Other                                                                                      43,840
                                                                                      ------------
        TOTAL INVESTMENT INCOME                                                        12,416,776
                                                                                      ------------

EXPENSES:
Investment advisory fees                                                                1,396,768
Interest                                                                                  792,000
Trustees' fees and expenses                                                               115,300
Professional fees                                                                          74,400
Reports to shareholders                                                                    60,000
Custodian fees                                                                             12,000
Transfer agent/registrar's expenses                                                         9,000
Other                                                                                      14,928
                                                                                      ------------
        TOTAL EXPENSES                                                                  2,474,396
                                                                                      ------------
INVESTMENT INCOME - NET                                                                 9,942,380
                                                                                      ------------

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
Net realized gain on investments before taxes                                             658,890
Income tax expense                                                                         (1,308)
                                                                                      ------------
        Net realized gain on investments after taxes                                      657,582
Net change in unrealized depreciation of investments before taxes                       5,096,199
Net change in deferred income tax expense                                                  19,435
                                                                                      ------------
Net change in unrealized depreciation of investments after taxes                        5,115,634
                                                                                      ------------
        NET GAIN ON INVESTMENTS                                                         5,773,216
                                                                                      ------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                                  $15,715,596
                                                                                      ============


See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
                                                                               3

CONSOLIDATED STATEMENT OF CASH FLOWS
FOR THE SIX MONTHS ENDED JUNE 30, 2010
(UNAUDITED)


                                                                                   
NET DECREASE IN CASH:
Cash flows from operating activities:
   Purchases/Proceeds/Maturities from short-term portfolio securities, net            $ (4,244,786)
   Purchases of portfolio securities                                                   (36,370,382)
   Proceeds from disposition of portfolio securities                                    27,132,380
   Interest, dividends and other income received                                         8,939,748
   Interest expense paid                                                                  (792,000)
   Operating expenses paid                                                              (1,634,776)
   Income taxes paid                                                                       (57,308)
                                                                                      ------------
        NET CASH USED FOR OPERATING ACTIVITIES                                          (7,027,124)
                                                                                      ------------

Cash flows from financing activities:
   Cash dividends paid from net investment income                                      (10,130,074)
   Receipts for shares issued on reinvestment of dividends                               1,149,005
                                                                                      ------------
        NET CASH USED FOR FINANCING ACTIVITIES                                          (8,981,069)
                                                                                      ------------
NET DECREASE IN CASH                                                                   (16,008,193)
Cash - beginning of year                                                                17,216,779
                                                                                      ------------
CASH - END OF PERIOD                                                                  $  1,208,586
                                                                                      ============

RECONCILIATION OF NET INCREASE IN NET ASSETS TO NET
CASH USED FOR OPERATING ACTIVITIES:

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                                  $ 15,715,596
                                                                                      ------------
   Increase in investments                                                             (19,399,973)
   Increase in interest and dividends receivable                                        (2,806,862)
   Increase in receivable for investments sold                                            (282,198)
   Increase in other assets                                                                (12,571)
   Increase in investment advisory fee payable                                              36,854
   Decrease in accrued expenses                                                            (37,066)
   Decrease in accrued taxes payable                                                       (75,435)
   Decrease in other payables                                                             (165,469)
                                                                                      ------------
        TOTAL ADJUSTMENTS TO NET ASSETS FROM OPERATIONS                                (22,742,720)
                                                                                      ------------
        NET CASH USED FOR OPERATING ACTIVITIES                                        $ (7,027,124)
                                                                                      ============


See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
4

                                                  MassMutual Corporate Investors

CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS


                                                                           For the six
                                                                           months ended     For the
                                                                            06/30/10       year ended
                                                                           (Unaudited)      12/31/09
                                                                           -----------    -----------
                                                                                    
INCREASE IN NET ASSETS:

Operations:
   Investment income - net                                                 $  9,942,380   $ 19,170,412
   Net realized gain on investments                                             657,582        868,412
   Net change in unrealized depreciation of investments                       5,115,634      5,285,777
                                                                            -----------    -----------
   Net increase in net assets resulting from operations                      15,715,596     25,324,601

Increase from common shares issued on reinvestment of dividends
   Common shares issued (2010 - 47,463; 2009 - 48,107)                        1,149,005      1,137,714

Dividends to shareholders from:
   Net investment income (2010 - $0.54 per share; 2009 - $2.16 per share)    (5,071,561)   (20,168,880)
                                                                            -----------    -----------

TOTAL INCREASE IN NET ASSETS                                                 11,793,040      6,293,435

NET ASSETS, BEGINNING OF YEAR                                               214,436,954    208,143,519
                                                                            -----------    -----------

NET ASSETS, END OF PERIOD/YEAR (including undistributed net investment
   income of $7,175,870 and $2,305,051, respectively)                      $226,229,994   $214,436,954
                                                                           ============   ============



See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
                                                                               5

CONSOLIDATED SELECTED FINANCIAL HIGHLIGHTS
SELECTED DATA FOR EACH SHARE OF BENEFICIAL INTEREST OUTSTANDING:


                                                    For the six months        For the years ended December 31,
                                                     ended 06/30/2010  -----------------------------------------------
                                                        (Unaudited)     2009      2008      2007      2006     2005
                                                         ---------    --------  --------  --------  --------  --------
                                                                                            
Net asset value:
  Beginning of year                                      $ 22.89      $ 22.33   $ 27.19   $ 27.51   $ 26.06   $ 24.34
                                                         --------     --------  --------  --------  --------  --------
Net investment income (a)                                   1.06         2.05      2.31      2.56      2.27      2.03
Net realized and unrealized
  gain (loss) on investments                                0.61         0.66     (5.02)    (0.35)     1.62      1.96(b)
                                                         --------     --------  --------  --------  --------  --------
Total from investment operations                            1.67         2.71     (2.71)     2.21      3.89      3.99
                                                         --------     --------  --------  --------  --------  --------
Dividends from net investment
  income to common shareholders                            (0.54)       (2.16)    (2.16)    (2.57)    (2.47)    (2.11)
Dividends from net realized gain
  on investments to common shareholders                       --           --        --        --     (0.01)    (0.18)
Increase from dividends reinvested                          0.01         0.01      0.01      0.04      0.04      0.02
                                                         --------     --------  --------  --------  --------  --------
Total dividends                                            (0.53)       (2.15)    (2.15)    (2.53)    (2.44)    (2.27)
                                                         --------     --------  --------  --------  --------  --------
Net asset value: End of period/year                      $ 24.03      $ 22.89   $ 22.33   $ 27.19   $ 27.51   $ 26.06
                                                         --------     --------  --------  --------  --------  --------
Per share market value:
  End of period/year                                     $ 26.23      $ 25.10   $ 19.25   $ 30.20   $ 34.89   $ 30.05
                                                         ========     ========  ========  ========  ========  ========
Total investment return
  Net asset value (c)                                       7.41%       12.64%   (10.34%)    8.72%    18.06%    20.04%
  Market value                                              6.80%       39.89%   (30.44%)   (8.78%)   29.04%    16.95%
Net assets (in millions):
  End of period/year                                     $226.23      $214.44   $208.14   $251.16   $251.69   $236.28
Ratio of operating expenses
  to average net assets                                     1.55%(d)     1.58%     1.49%     1.55%     1.43%     1.78%
Ratio of interest expense
  to average net assets                                     0.73%(d)     0.75%     0.67%     0.59%     0.60%     0.73%
Ratio of income tax expense
  to average net assets (e)                                 0.00%(d)     0.00%     0.00%     0.35%     2.46%     2.84%
Ratio of total expenses before custodian fee
  reduction to average net assets (e)                       2.28%(d)     2.33%     2.16%     2.49%     4.53%     5.36%
Ratio of net expenses after custodian fee
  reduction to average net assets (e)                       2.28%(d)     2.33%     2.16%     2.49%     4.49%     5.35%
Ratio of net investment income
  to average net assets                                     9.14%(d)     9.06%     9.01%     9.17%     8.19%     7.98%
Portfolio turnover                                            11%          23%       32%       44%       35%       35%

(a) Calculated using average shares.
(b) Amount includes $0.19 per share in litigation proceeds.
(c) Net asset value return represents portfolio returns based on change in the Trust's net asset value assuming the reinvestment of
    all dividends and distributions which differs from the total investment return based on the Trust's market value due to the
    difference between the Trust's net asset value and the market value of its shares outstanding; past performance is no guarantee
    of future results.
(d) Annualized
(e) As additional information, this ratio is included to reflect the taxes paid on retained long-term gains. These taxes paid are
    netted against realized capital gains in the Statement of Operations. The taxes paid are treated as deemed distributions and a
    credit for the taxes paid is passed on to the shareholders.

Senior borrowings:
Total principal amount (in millions)                       $   30       $   30     $   30   $   30     $    20   $    20
Asset coverage per $1,000
  of indebtedness                                          $8,541       $8,148     $7,938   $9,372     $13,584   $12,814


See Notes to Consolidated Financial Statements
--------------------------------------------------------------------------------
6

                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS
June 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES - 91.10%:(A)D                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
Private Placement Investments - 84.45%

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                                         $   1,413,462          *   $   1,385,193   $   1,427,861
13% Senior Subordinated Note due 2016                                    $   1,413,461   11/10/09       1,265,201       1,431,785
Common Stock (B)                                                          323,077 shs.   11/10/09         323,077         306,923
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                      161,538 shs.   11/10/09         119,991           1,615
                                                                                                    -------------   -------------
* 11/10/09 and 11/18/09.                                                                                3,093,462       3,168,184
                                                                                                    -------------   -------------

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                                    $   2,516,449   11/21/07       2,465,140       2,541,613
Limited Partnership Interest (B)                                           23.16% int.   11/21/07         224,795         329,347
                                                                                                    -------------   -------------
                                                                                                        2,689,935       2,870,960
                                                                                                    -------------   -------------

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                                  $     850,946   12/31/08         739,153         867,964
Limited Liability Company Unit Class A-2 (B)                                1,276 uts.   12/31/08         140,406         174,193
Limited Liability Company Unit Class A-3 (B)                                1,149 uts.   12/31/08         126,365         156,774
                                                                                                    -------------   -------------
                                                                                                        1,005,924       1,198,931
                                                                                                    -------------   -------------

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                                 $   2,318,182   10/09/09       1,986,875       2,370,960
Limited Liability Company Unit Class A (B)                                  2,359 uts.   10/09/09         231,818         220,215
Limited Liability Company Unit Class B (B)                                  2,782 uts.   10/09/09         273,352              28
                                                                                                    -------------   -------------
                                                                                                        2,492,045       2,591,203
                                                                                                    -------------   -------------

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                                  $     735,000   05/15/08         720,300         684,308
13% Senior Subordinated Note due 2015                                    $     735,000   05/15/08         671,403         655,731
Common Stock (B)                                                          105,000 shs.   05/15/08         105,000            --
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                       36,923 shs.   05/15/08          62,395            --
                                                                                                    -------------   -------------
                                                                                                        1,559,098       1,340,039
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                7


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
June 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                                    $   2,198,996   12/27/07   $   2,156,427   $   2,204,252
Preferred Stock (B)                                                         1,031 shs.   12/27/07         510,000         423,889
                                                                                                    -------------   -------------
                                                                                                        2,666,427       2,628,141
                                                                                                    -------------   -------------
AERO HOLDINGS, INC.
A provider of geospatial services to corporate and government clients.
10.5% Senior Secured Term Note due 2014                                  $   1,627,500   03/09/07       1,603,088       1,649,515
14% Senior Subordinated Note due 2015                                    $   1,260,000   03/09/07       1,157,982       1,260,000
Common Stock (B)                                                          262,500 shs.   03/09/07         262,500          14,956
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                       66,116 shs.   03/09/07         111,527           3,767
                                                                                                    -------------   -------------
                                                                                                        3,135,097       2,928,238
                                                                                                    -------------   -------------
ALL CURRENT HOLDING COMPANY
A specialty re-seller of essential electrical parts and components primarily serving wholesale distributors.
12% Senior Subordinated Note due 2015                                    $   1,140,317   09/26/08       1,050,599       1,127,381
Common Stock (B)                                                            1,347 shs.   09/26/08         134,683          78,409
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          958 shs.   09/26/08          87,993          55,765
                                                                                                    -------------   -------------
                                                                                                        1,273,275       1,261,555
                                                                                                    -------------   -------------
AMERICAN HOSPICE MANAGEMENT HOLDING LLC
A for-profit hospice care provider in the United States.
12% Senior Subordinated Note due 2013                                    $   3,187,495          *       3,033,665       3,187,495
Preferred Class A Unit (B)                                                  3,223 uts.         **         322,300         529,914
Preferred Class B Unit (B)                                                  1,526 uts.   06/09/08         152,626         208,946
Common Class B Unit (B)                                                    30,420 uts.   01/22/04               1          93,594
Common Class D Unit (B)                                                     6,980 uts.   09/12/06               1          21,475
                                                                                                    -------------   -------------
* 01/22/04 and 06/09/08. ** 01/22/04 and 09/12/06.                                                      3,508,593       4,041,424
                                                                                                    -------------   -------------
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                                  $   1,912,500   04/28/09       1,615,156       1,950,750
Preferred Stock Series B (B)                                                3,065 shs.   04/28/09         306,507         353,438
Common Stock (B)                                                            1,366 shs.   04/28/09           1,366         157,524
                                                                                                    -------------   -------------
                                                                                                        1,923,029       2,461,712
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
8


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 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                                    $   1,859,060   05/18/05   $   1,667,348   $   1,580,201
Preferred Stock (B)                                                            63 shs.   10/16/09          62,756          31,380
Common Stock (B)                                                              497 shs.   05/18/05         497,340            --
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                          130 shs.   05/18/05         112,128            --
                                                                                                    -------------   -------------
                                                                                                        2,339,572       1,611,581
                                                                                                    -------------   -------------
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                                  $   2,281,593   06/30/06       2,177,821       2,281,593
Preferred Stock Class A (B)                                                   879 shs.   06/30/06         268,121         156,437
Common Stock (B)                                                                 1 sh.   06/30/06             286            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                          309 shs.   06/30/06          92,102          54,979
                                                                                                    -------------   -------------
                                                                                                        2,538,330       2,493,009
                                                                                                    -------------   -------------
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                                  $     750,872   08/07/08         735,855         704,821
12.5% Senior Subordinated Note due 2015                                  $     750,872   08/07/08         690,426         670,761
Common Stock (B)                                                           73,256 shs.   08/07/08          73,256            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                       57,600 shs.   08/07/08          57,689            --
                                                                                                    -------------   -------------
                                                                                                        1,557,226       1,375,582
                                                                                                    -------------   -------------
CAPITAL SPECIALTY PLASTICS, INC.
A producer of desiccant strips used for packaging pharmaceutical products.
Common Stock (B)                                                              109 shs.          *             503       1,126,577
*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                                 $   2,400,000   12/02/08       2,225,100       2,448,000
Preferred Stock (B)                                                           277 shs.   12/02/08         276,900         337,320
                                                                                                    -------------   -------------
                                                                                                        2,502,000       2,785,320
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                9


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
COEUR, INC.
A producer of proprietary, disposable power injection syringes.
12% Senior Subordinated Note due 2016                                    $   1,214,286   10/10/08   $   1,098,929   $   1,238,572
Common Stock (B)                                                              607 shs.   10/10/08          60,714          39,098
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          934 shs.   10/10/08          91,071          60,151
                                                                                                    -------------   -------------
                                                                                                        1,250,714       1,337,821
                                                                                                    -------------   -------------
CONNECTICUT ELECTRIC, INC.
A supplier and distributor of electrical products sold into the retail and wholesale markets.
10% Senior Subordinated Note due 2014 (D)                                $   1,456,429   01/12/07       1,358,631         873,857
Limited Liability Company Unit Class A (B)                                156,046 uts.   01/12/07         156,046            --
Limited Liability Company Unit Class C (B)                                112,873 uts.   01/12/07         112,873            --
Limited Liability Company Unit Class D (B)                              1,268,437 uts.   05/03/10            --              --
Limited Liability Company Unit Class E (B)                                  2,081 uts.   05/03/10            --              --
                                                                                                    -------------   -------------
                                                                                                        1,627,550         873,857
                                                                                                    -------------   -------------
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)                                             17,152 shs.   07/05/07         700,392       1,715,247
Preferred Stock Series C (B)                                                8,986 shs.   07/05/07         300,168         898,560
Common Stock (B)                                                              718 shs.   07/05/07               7             251
Limited Partnership Interest (B)                                           12.64% int.          *         189,586              --
                                                                                                    -------------   -------------
*08/12/04 and 01/14/05.                                                                                 1,190,153       2,614,058
                                                                                                    -------------   -------------
COREPHARMA LLC
A manufacturer of oral dose generic pharmaceuticals targeted at niche applications.
12% Senior Subordinated Note due 2013                                    $   2,550,000   08/04/05       2,473,370       2,550,000
Warrant, exercisable until 2013, to purchase
  common stock at $.001 per share (B)                                          20 shs.   08/04/05         137,166         187,630
                                                                                                    -------------   -------------
                                                                                                        2,610,536       2,737,630
                                                                                                    -------------   -------------
CRANE RENTAL CORPORATION
A crane rental company.
13% Senior Subordinated Note due 2015                                    $   2,295,000   08/21/08       2,090,661       2,336,927
Common Stock (B)                                                          255,000 shs.   08/21/08         255,000          11,005
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                      136,070 shs.   08/21/08         194,826           5,872
                                                                                                    -------------   -------------
                                                                                                        2,540,487       2,353,804
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
10


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
CUSTOM ENGINEERED WHEELS, INC.
A manufacturer of custom engineered, non-pneumatic plastic wheels and plastic tread cap tires used primarily for lawn and garden
products and wheelchairs.
12.5% Senior Subordinated Note due 2016                                  $   2,182,212   10/27/09   $   1,892,808   $   2,227,721
Preferred Stock PIK (B)                                                       296 shs.   10/27/09         295,550         280,773
Preferred Stock Series A (B)                                                  216 shs.   10/27/09         197,152               2
Common Stock (B)                                                               72 shs.   10/27/09          72,238          68,628
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                           53 shs.   10/27/09          48,608               1
                                                                                                    -------------   -------------
                                                                                                        2,506,356       2,577,125
                                                                                                    -------------   -------------
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                                    $   1,847,826   10/30/06       1,758,010       1,797,413
Limited Partnership Interest (B)                                            1.82% int.   10/30/06         702,174         489,115
Warrant, exercisable until 2014, to purchase
  preferred stock at $.01 per share (B)                                        50 shs.   10/30/06          49,830          61,449
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           34 shs.   10/30/06          34,000              --
                                                                                                    -------------   -------------
                                                                                                        2,544,014       2,347,977
                                                                                                    -------------   -------------
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)                                        27.20% int.   08/27/98         734,090            --
Preferred Stock (B)                                                         2,586 shs.   12/14/01       2,186,976       2,588,420
Warrants, exercisable until 2011, to purchase common
  stock of DHI Holdings, Inc. at $.01 per share (B)                        13,352 shs.          *         403,427         382,209
                                                                                                    -------------   -------------
*10/24/96 and 08/28/98.                                                                                 3,324,493       2,970,629
                                                                                                    -------------   -------------
DUNCAN SYSTEMS, INC.
A distributor of windshields and side glass for the recreational vehicle market.
10% Senior Secured Term Note due 2013                                    $     405,000   11/01/06         398,925         413,020
13% Senior Subordinated Note due 2014                                    $     855,000   11/01/06         786,802         855,000
Common Stock (B)                                                          180,000 shs.   11/01/06         180,000         159,193
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                       56,514 shs.   11/01/06          78,160          49,981
                                                                                                    -------------   -------------
                                                                                                        1,443,887       1,477,194
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                               11


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
DWYER GROUP, INC.
A franchiser of a variety of home repair services.
Common Stock (B)                                                            6,906 shs.          *   $     690,600   $   1,197,276
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                        2,034 shs.   10/30/03         186,469         352,558
                                                                                                    -------------   -------------
*10/30/03 and 01/02/04.                                                                                   877,069       1,549,834
                                                                                                    -------------   -------------
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                                    $   2,332,768   01/08/08       2,288,865       2,252,390
Common Stock (B)                                                              660 shs.   01/08/08         329,990          74,013
                                                                                                    -------------   -------------
                                                                                                        2,618,855       2,326,403
                                                                                                    -------------   -------------
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)                                           22 shs.   06/28/04          77,208          61,082
                                                                                                    -------------   -------------
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                                  $   2,850,000   02/01/10       2,471,700       2,872,049
Common Stock (B)                                                              150 shs.   02/01/10         150,000         142,500
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          358 shs.   02/01/10         321,300               4
                                                                                                    -------------   -------------
                                                                                                        2,943,000       3,014,553
                                                                                                    -------------   -------------
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                                    $   2,225,389   10/06/08       2,181,700       2,267,049
Preferred Stock (B)                                                         4,341 shs.   10/06/08         434,074         201,819
Common Stock (B)                                                            3,069 shs.   10/06/08           3,069            --
                                                                                                    -------------   -------------
                                                                                                        2,618,843       2,468,868
                                                                                                    -------------   -------------
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)                                $   2,390,625   06/01/06       2,220,452            --
Limited Liability Company Units of Linden/FHS Holdings LLC (B)                159 uts.   06/01/06         159,362            --
Common Unit Class B (B)                                                     1,386 uts.   06/01/06         122,361            --
                                                                                                    -------------   -------------
                                                                                                        2,502,175            --
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
12


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
FLUTES, INC.
An independent manufacturer of micro fluted corrugated sheet material for the food and consumer products packaging industries.
10% Senior Secured Term Note due 2013 (D)                                $     918,385   04/13/06   $     904,609   $     229,596
14% Senior Subordinated Note due 2014 (D)                                $     555,059   04/13/06         495,635            --
                                                                                                    -------------   -------------
                                                                                                        1,400,244         229,596
                                                                                                    -------------   -------------
GOLDEN COUNTY FOODS HOLDING, INC.
A manufacturer of frozen appetizers and snacks.
16% Senior Subordinated Note due 2015                                    $   1,912,500   11/01/07       1,727,592       1,816,875
16% PIK Note due 2015                                                    $     436,141   12/31/08         421,603         414,334
8% Series A Convertible Preferred Stock, convertible into
  fully dilluted common shares (B)                                        146,658 shs.   11/01/07         146,658          52,917
                                                                                                    -------------   -------------
                                                                                                        2,295,853       2,284,126
                                                                                                    -------------   -------------
H M HOLDING COMPANY
A designer, manufacturer, and importer of promotional and wood furniture.
7.5% Senior Subordinated Note due 2013 (D)                               $     685,100   10/15/09         512,231         513,825
Preferred Stock (B)                                                            40 shs.          *          40,476            --
Preferred Stock Series B (B)                                                2,055 shs.   10/15/09       1,536,694
Common Stock (B)                                                              340 shs.   02/10/06         340,000            --
Common Stock Class C (B)                                                      560 shs.   10/15/09            --              --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                          126 shs.   02/10/06         116,875            --
                                                                                                    -------------   -------------
* 09/18/07 and 06/27/08.                                                                                2,546,276         513,825
                                                                                                    -------------   -------------
HIGHGATE CAPITAL LLC
An acquirer of controlling or substantial interests in manufacturing and marketing entities.
Series A Preferred Units (B)                                                1.19% int.   07/21/94         367,440          --
                                                                                                    -------------   -------------
HOME DECOR HOLDING COMPANY
A designer, manufacturer and marketer of framed art and wall decor products.
12.5% Senior Subordinated Note due 2012                                  $   2,043,269          *       1,921,994       2,043,269
Common Stock (B)                                                               63 shs.          *          62,742          88,147
Warrant, exercisable until 2012, to purchase
  common stock at $.02 per share (B)                                          200 shs.          *         199,501         280,290
                                                                                                    -------------   -------------
* 06/30/04 and 08/19/04.                                                                                2,184,237       2,411,706
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                               13


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
HOSPITALITY MINTS HOLDING COMPANY
A manufacturer of individually-wrapped imprinted promotional mints.
12% Senior Subordinated Note due 2016                                    $   2,075,581   08/19/08   $   1,920,297   $   1,971,802
Common Stock (B)                                                              474 shs.   08/19/08         474,419          83,423
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                          123 shs.   08/19/08         113,773          21,562
                                                                                                    -------------   -------------
                                                                                                        2,508,489       2,076,787
                                                                                                    -------------   -------------
INSURANCE CLAIMS MANAGEMENT, INC.
A third party administrator providing auto and property claim administration services for insurance companies.
Common Stock (B)                                                               69 shs.   02/27/07           2,077         221,827
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                           20 shs.   02/27/07             612          65,334
                                                                                                    -------------   -------------
                                                                                                            2,689         287,161
                                                                                                    -------------   -------------
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                         $   2,550,000   07/07/09       2,299,566       2,581,309
Limited Liability Company Unit (B)                                          3,112 uts.   07/07/09         186,684              31
                                                                                                    -------------   -------------
                                                                                                        2,486,250       2,581,340
                                                                                                    -------------   -------------
JASON, INC.
A diversified manufacturing company serving various industrial markets.
13% Senior Subordinated Note due 2010 (D)                                $     963,687   08/04/00         848,275          48,184
Limited Partnership Interest of
  Saw Mill Capital Fund II, L.P. (B)                                        2.50% int.   08/03/00         886,470            --
Warrant, exercisable until 2010, to purchase
  common stock at $.01 per share (B)                                       50,870 shs.   08/04/00         115,412            --
                                                                                                    -------------   -------------
                                                                                                        1,850,157          48,184
                                                                                                    -------------   -------------
JUSTRITE MANUFACTURING ACQUISITION CO.
A manufacturer of safety products such as storage cabinets and containers.
12% Senior Subordinated Note due 2011                                    $   1,593,750   12/15/04       1,559,825       1,593,750
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                        1,121 shs.   12/15/04         101,109         202,175
                                                                                                    -------------   -------------
                                                                                                        1,660,934       1,795,925
                                                                                                    -------------   -------------
K H O F HOLDINGS, INC.
A manufacturer of premium disposable tableware products serving both the foodservice and consumer channels.
Common Stock (B)                                                          220,673 shs.   10/15/07         135,084         270,607
                                                                                                    -------------   -------------

---------------------------------------------------------------------------------------------------------------------------------
14


                                                 MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
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)                              $   3,012,887   05/25/06   $   2,641,395   $   2,259,666
Common Stock (B)                                                          134,210 shs.   05/25/06         134,210            --
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                       82,357 shs.   05/25/06          71,534            --
                                                                                                    -------------   -------------
                                                                                                        2,847,139       2,259,666
                                                                                                    -------------   -------------
K P I HOLDINGS, INC.
Pace Industries is the largest player in the U.S. non-automotive, non-ferrous die casting segment.
13% Senior Subordinated Note due 2014 (D)                                $   2,106,522   07/16/08       1,968,368       1,790,544
Convertible Preferred Stock Series C (B)                                       55 shs.   06/30/09          55,435            --
Convertible Preferred Stock Series D (B)                                       24 shs.   09/17/09          24,476            --
Common Stock (B)                                                              443 shs.   07/15/08         443,478            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          734 shs.          *          96,024            --
                                                                                                    -------------   -------------
* 07/16/08 and 09/17/09.                                                                                2,587,781       1,790,544
                                                                                                    -------------   -------------
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                                    $   2,938,407   03/14/07       2,667,363       2,350,726
Common Stock (B)                                                              232 shs.   03/13/07         232,000            --
Warrant, exercisable until 2019, to purchase
  preferred stock at $.01 per share (B)                                       134 shs.   07/07/09            --              --
Warrant, exercisable until 2017, to purchase
  common stock at $.01 per share (B)                                          167 shs.   03/14/07         162,260            --
                                                                                                    -------------   -------------
                                                                                                        3,061,623       2,350,726
                                                                                                    -------------   -------------
K-TEK HOLDING CORPORATION
A manufacturer of instrumentation for liquid and bulk solids level detection for process and storage tanks.
14% Senior Subordinated Note due 2015                                    $   2,287,451   12/20/07       2,246,086       2,310,326
Preferred Stock (B)                                                       363,260 shs.   12/20/07         363,260         443,811
Common Stock (B)                                                          102,616 shs.   12/20/07           1,026         300,124
                                                                                                    -------------   -------------
                                                                                                        2,610,372       3,054,261
                                                                                                    -------------   -------------
L H D EUROPE HOLDING, INC.
A non-carbonated beverage dispensing company focused on the foodservice industry.
Common Stock (B)                                                               85 shs.   12/28/09           7,916          24,225
                                                                                                    -------------   -------------

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


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 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                                    $   1,236,312   09/12/08   $   1,146,005   $   1,175,484
Common Stock (B)                                                               61 shs.   09/12/08          60,714            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                           66 shs.   09/12/08          65,571            --
                                                                                                    -------------   -------------
                                                                                                        1,272,290       1,175,484
                                                                                                    -------------   -------------
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                                  $     975,000   05/04/07         912,469         975,000
Limited Liability Company Unit (B)                                         24,109 uts.          *         314,464         332,804
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                        3,375 shs.   05/04/07          43,031          46,589
                                                                                                    -------------   -------------
* 05/04/07 and 01/02/08.                                                                                1,269,964       1,354,393
                                                                                                    -------------   -------------
MANHATTAN BEACHWEAR HOLDING COMPANY
A designer and distributor of women's swimwear.
12.5% Senior Subordinated Note due 2018                                  $   2,647,059   01/15/10       2,320,245       2,682,925
Common Stock (B)                                                              353 shs.   01/15/10         352,941         335,293
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                          312 shs.   01/15/10         283,738               3
                                                                                                    -------------   -------------
                                                                                                        2,956,924       3,018,221
                                                                                                    -------------   -------------
MAVERICK ACQUISITION COMPANY
A manufacturer of capsules that cover the cork and neck of wine bottles.
7.03% Senior Secured Tranche A Note due 2010 (C)                         $     193,178   09/03/04         193,178         192,365
12.5% Senior Secured Tranche B Note due 2011                             $     313,433   09/03/04         303,187         306,684
6.79% Senior Secured Revolver due 2011 (C)                               $      50,933   09/03/04          50,932          50,232
Limited Partnership Interest (B)                                            7.84% int.   09/03/04          58,769          16,940
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                          425 shs.   09/03/04          39,473          12,239
                                                                                                    -------------   -------------
                                                                                                          645,539         578,460
                                                                                                    -------------   -------------
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                                    $   1,169,464   08/29/08       1,046,168       1,192,854
Preferred Unit (B)                                                            126 uts.   08/29/08         125,519         142,332
Common Unit Class A (B)                                                     1,268 uts.   08/29/08           1,268          25,095
Common Unit Class B (B)                                                       472 uts.   08/29/08         120,064           9,337
                                                                                                    -------------   -------------
                                                                                                        1,293,019       1,369,618
                                                                                                    -------------   -------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
MEGTEC HOLDINGS, INC.
A supplier of industrial and environmental products and services to a broad array of industries.
12% Senior Subordinated Note due 2016                                    $   2,161,017   09/24/08   $   1,981,274   $   2,052,966
Preferred Stock (B)                                                           107 shs.   09/24/08         103,255            --
Limited Partnership Interest (B)                                            1.40% int.   09/16/08         388,983            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                           35 shs.   09/24/08          33,268            --
                                                                                                    -------------   -------------
                                                                                                        2,506,780       2,052,966
                                                                                                    -------------   -------------
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)                                $   2,685,614          *       2,588,904       2,282,772
Common Stock (B)                                                              450 shs.          *         450,000            --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                          164 shs.          *         162,974            --
                                                                                                    -------------   -------------
* 08/12/05 and 09/11/06.                                                                                3,201,878       2,282,772
                                                                                                    -------------   -------------
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                                    $   2,353,846   07/21/08       2,233,224       2,118,461
Preferred Stock (B)                                                           263 shs.   07/21/08         261,830            --
Common Stock (B)                                                               18 shs.   07/21/08          20,000            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           10 shs.   07/21/08          11,285            --
                                                                                                    -------------   -------------
                                                                                                        2,526,339       2,118,461
                                                                                                    -------------   -------------
MOMENTUM HOLDING CO.
A designer and supplier of upholstery fabric to commercial furniture manufacturers and architectural and design firms.
Limited Partnership Interest (B)                                           21.23% int.   08/04/06         106,153         243,812
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                        1,107 shs.   08/04/06         107,109         254,146
                                                                                                    -------------   -------------
                                                                                                          213,262         497,958
                                                                                                    -------------   -------------
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)                                $   2,550,000   07/25/08       2,412,564       1,275,000
14% PIK Note due 2014 (D)                                                $     792,791   07/25/08         646,821         396,395
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                          152 shs.   03/31/06         138,125            --
                                                                                                    -------------   -------------
                                                                                                        3,197,510       1,671,395
                                                                                                    -------------   -------------

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


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
NABCO, INC.
A producer of explosive containment vessels in the United States.
14% Senior Subordinated Note due 2014 (D)                                $     625,000   02/24/06   $     575,313   $     312,500
Limited Liability Company Unit (B)                                            825 uts.          *         825,410            --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                          129 shs.   02/24/06          37,188            --
                                                                                                    -------------   -------------
* 02/24/06 and 06/22/07.                                                                                1,437,911         312,500
                                                                                                    -------------   -------------
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)                                  $     609,206   05/28/04         607,397         578,746
14% Senior Subordinated Note due 2014 (D)                                $   1,338,613   05/28/04       1,155,793            --
                                                                                                    -------------   -------------
                                                                                                        1,763,190         578,746
                                                                                                    -------------   -------------
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                            $   2,125,000   08/02/07       1,888,243       2,146,250
Common Stock (B)                                                          425,000 shs.   08/02/07         425,000         487,724
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                      119,360 shs.   08/02/07         194,257         136,976
                                                                                                    -------------   -------------
                                                                                                        2,507,500       2,770,950
                                                                                                    -------------   -------------
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                                    $   1,530,000   02/02/07       1,408,570       1,159,194
Limited Partnership Interest of
  Saw Mill PCG Partners LLC (B)                                             2.73% int.   02/01/07       1,019,980            --
Limited Liability Company Unit Class D of
  Saw Mill PCG Partners LLC (B)                                                15 uts.          *          15,389           7,695
Limited Liability Company Unit Class D-1 of
  Saw Mill PCG Partners LLC (B)                                                95 uts.   09/30/09          95,405          47,713
Preferred Stock Class A (B)                                                      1 sh.   12/18/08           1,370             686
Preferred Stock Class A-1 (B)                                                   7 shs.   09/30/09           8,278           4,140
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           91 shs.   02/02/07          90,830            --
                                                                                                    -------------   -------------
* 12/18/08 and 09/30/09.                                                                                2,639,822       1,219,428
                                                                                                    -------------   -------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 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                                    $   2,281,579   07/09/09   $   1,915,080   $   2,350,026
Limited Partnership Interest (B)                                            2,684 uts.   07/09/09         268,421         255,000
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                        3,498 shs.   07/09/09         349,753              35
                                                                                                    -------------   -------------
                                                                                                        2,533,254       2,605,061
                                                                                                    -------------   -------------
NYLONCRAFT, INC.
A supplier of engineered plastic components for the automotive industry.
10% Senior Secured Note due 2012                                         $     812,500   01/28/02         812,500         771,875
15% Senior Subordinated Note due 2012 (D)                                $     500,000   01/28/02         473,642         250,000
Convertible Preferred Stock A (B)                                           1,000 shs.   01/28/02         961,637            --
Common Stock (B)                                                          312,500 shs.   01/28/02         312,500            --
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                      243,223 shs.   01/28/02         162,045            --
                                                                                                    -------------   -------------
                                                                                                        2,722,324       1,021,875
                                                                                                    -------------   -------------
O E C HOLDINGS CORPORATION
Headquartered in Dover Plains, New York, Oracle Elevator Company provides elevator maintenance, repair and modernization services.
13% Senior Subordinated Note due 2017                                    $   1,333,333   06/04/10       1,213,349       1,338,470
Preferred Stock Series A (B)                                                1,661 shs.   06/04/10         166,062         157,759
Preferred Stock Series B (B)                                                  934 shs.   06/04/10          93,376               9
Common Stock (B)                                                            1,032 shs.   06/04/10           1,032             981
                                                                                                    -------------   -------------
                                                                                                        1,473,819       1,497,219
                                                                                                    -------------   -------------
OAKRIVER TECHNOLOGY, INC.
Designs, engineers and assembles high precision automated process equipment for the medical device industry with a focus on
defibrillators and stents.
10% Senior Secured Note due 2012                                         $     145,713   01/03/06         143,527         145,713
13% Senior Subordinated Note due 2013                                    $     687,241   01/03/06         639,325         687,241
Common Stock (B)                                                          322,307 shs.   01/03/06         322,307         230,626
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                       75,378 shs.   01/03/06          62,824          53,937
                                                                                                    -------------   -------------
                                                                                                        1,167,983       1,117,517
                                                                                                    -------------   -------------
OLYMPIC SALES, INC.
A boat retailer in Washington state, Oregon, California and British Columbia.
12% Senior Subordinated Note due 2010 (D)                                $   1,022,000   08/07/98       1,022,000         153,300
12% Senior Subordinated Note due 2010 (D)                                $     307,071   02/09/00         268,283          46,061
                                                                                                    -------------   -------------
                                                                                                        1,290,283         199,361
                                                                                                    -------------   -------------

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


CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 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)                                          3,667 uts.   01/17/06   $     572,115   $     521,311
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                          619 shs.   01/17/06         170,801          88,016
                                                                                                    -------------   -------------
                                                                                                          742,916         609,327
                                                                                                    -------------   -------------
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                                    $   2,335,864   07/03/06       2,257,789       2,371,019
Preferred Unit (B)                                                            382 uts.   07/03/06         382,150         581,167
Preferred Unit (B)                                                             69 uts.   07/03/06          68,790         104,615
Common Unit Class I (B)                                                       148 uts.   07/03/06            --           616,819
Common Unit Class L (B)                                                        31 uts.   07/03/06            --           130,350
                                                                                                    -------------   -------------
                                                                                                        2,708,729       3,803,970
                                                                                                    -------------   -------------
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                                    $   2,295,000   03/31/06       2,195,027       2,295,000
Preferred Stock (B)                                                            36 shs.   03/31/06         329,596         457,549
Common Stock (B)                                                               23 shs.   03/31/06          25,500         197,647
Warrant, exercisable until 2013, to purchase
  common stock at $.01 per share (B)                                           13 shs.   03/31/06          11,122         114,971
                                                                                                    -------------   -------------
                                                                                                        2,561,245       3,065,167
                                                                                                    -------------   -------------
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                                    $   1,351,424   04/27/07       1,279,381       1,237,206
Limited Liability Company Unit (B)                                      1,754,707 uts.   04/27/07          63,233            --
                                                                                                    -------------   -------------
                                                                                                        1,342,614       1,237,206
                                                                                                    -------------   -------------
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                                    $   2,125,000   12/19/00       2,071,563       2,123,795
Membership Interests of MM/Lincap
  PPI Investments, Inc., LLC (B)                                            2.42% int.   12/21/00         265,625         274,694
                                                                                                    -------------   -------------
                                                                                                        2,337,188       2,398,489
                                                                                                    -------------   -------------
PEARLMAN ENTERPRISES, INC.
A developer and distributor of tools, equipment, and supplies to the natural and engineered stone industry.
Preferred Stock Series A (B)                                                2,334 shs.   05/22/09         111,508            --
Preferred Stock Series B (B)                                               13,334 shs.   05/22/09         547,872            --
Common Stock (B)                                                           40,540 shs.   05/22/09       1,877,208            --
                                                                                                    -------------   -------------
                                                                                                        2,536,588            --
                                                                                                    -------------   -------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
POSTLE ALUMINUM COMPANY LLC
A manufacturer and distributor of aluminum extruded products.
15% Senior Subordinated Note due 2013                                    $   1,530,000   06/03/10   $   1,499,400   $   1,533,596
3% Senior Subordinated PIK Note due 2014 (D)                             $   2,198,100   10/02/06       2,014,226            --
Limited Liability Company Unit Class A (B)                                  1,384 uts.   10/02/06         510,000            --
Limited Liability Company Unit (B)                                            143 uts.   05/22/09          72,042          67,828
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                        8,595 shs.   10/02/06         124,644            --
                                                                                                    -------------   -------------
                                                                                                        4,220,312       1,601,424
                                                                                                    -------------   -------------
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                                    $   2,372,093   02/11/08       2,189,265       2,274,165
Limited Partnership Interest (B)                                           23.70% int.   02/11/08         177,729          21,606
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                        1,322 shs.   02/11/08         167,588          42,581
                                                                                                    -------------   -------------
                                                                                                        2,534,582       2,338,352
                                                                                                    -------------   -------------
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                                 $   2,564,895   11/12/09       2,313,217       2,604,281
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                          206 shs.   11/12/09         203,944               2
                                                                                                    -------------   -------------
                                                                                                        2,517,161       2,604,283
                                                                                                    -------------   -------------
QUALIS AUTOMOTIVE LLC
A distributor of aftermarket automotive brake and chassis products.
13% Senior Subordinated Note due 2013                                    $   1,742,711   05/28/04       1,598,853       1,820,047
Common Stock (B)                                                          354,167 shs.   05/28/04         354,166         515,941
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                      377,719 shs.   05/28/04         377,719         550,250
                                                                                                    -------------   -------------
                                                                                                        2,330,738       2,886,238
                                                                                                    -------------   -------------
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                                  $   2,434,074   12/15/06       2,244,702       2,312,370
Limited Liability Company Unit (B)                                          2,828 uts.   12/15/06         282,810          88,662
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                            3 shs.   12/15/06         131,483          41,812
                                                                                                    -------------   -------------
                                                                                                        2,658,995       2,442,844
                                                                                                    -------------   -------------

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


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
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                                    $   2,550,000   01/18/08   $   2,467,911   $   2,551,017
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                            6 shs.   01/18/08          31,089             468
                                                                                                    -------------   -------------
                                                                                                        2,499,000       2,551,485
                                                                                                    -------------   -------------
ROYAL BATHS MANUFACTURING COMPANY
A manufacturer and distributor of acrylic and cultured marble bathroom products.
12.5% Senior Subordinated Note due 2011                                  $   1,062,500   11/14/03       1,032,510       1,052,506
Warrant, exercisable until 2011, to purchase
  common stock at $.01 per share (B)                                          140 shs.   11/14/03         122,946         120,828
                                                                                                    -------------   -------------
                                                                                                        1,155,456       1,173,334
                                                                                                    -------------   -------------
SAFETY SPEED CUT MANUFACTURING COMPANY, INC.
A manufacturer of vertical panel saws and routers for the woodworking industry.
Class B Common Stock (B)                                                    1,480 shs.   06/02/99         256,212         274,395
                                                                                                    -------------   -------------
SAVAGE SPORTS HOLDING, INC.
A manufacturer of sporting firearms.
12% Senior Subordinated Note due 2012                                    $   1,538,793   09/10/04       1,487,423       1,538,793
Preferred Stock Series A (B)                                               66,185 shs.   05/28/10          66,185          62,876
Common Stock (B)                                                              612 shs.          *         642,937       1,045,385
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                          134 shs.   09/10/04         113,578         228,242
                                                                                                    -------------   -------------
* 09/10/04 and 10/05/07.                                                                                2,310,123       2,875,296
                                                                                                    -------------   -------------
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                                  $   1,765,385   01/15/09       1,564,156       1,500,577
Common Stock (B)                                                              131 shs.   01/15/09         130,769           9,657
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                          282 shs.   01/15/09         281,604          20,801
                                                                                                    -------------   -------------
                                                                                                        1,976,529       1,531,035
                                                                                                    -------------   -------------
SMART SOURCE HOLDINGS LLC
A short-term computer rental company.
12% Senior Subordinated Note due 2015                                    $   2,223,076          *       2,051,189       2,160,501
Limited Liability Company Unit (B)                                            619 uts.          *         631,592         329,829
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                          157 shs.          *         164,769          83,557
                                                                                                    -------------   -------------
* 08/31/07 and 03/06/08.                                                                                2,847,550       2,573,887
                                                                                                    -------------   -------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
SPARTAN FOODS HOLDING COMPANY
A manufacturer of branded pizza crusts and pancakes.
12.25% Senior Subordinated Note due 2017                                 $   1,912,500   12/15/09   $   1,655,527   $   1,940,317
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                          257 shs.   12/15/09         227,109               3
                                                                                                    -------------   -------------
                                                                                                        1,882,636       1,940,320
                                                                                                    -------------   -------------
SPECIALTY COMMODITIES, INC.
A distributor of specialty food ingredients.
13.25% Senior Subordinated Note due 2016                                 $   2,297,852   10/23/08       2,163,806       2,343,809
Common Stock (B)                                                           30,000 shs.   10/23/08         300,000         271,492
Warrant, excercisable until 2018, to purchase
  common stock at $.01 per share (B)                                       11,054 shs.   10/23/08         100,650         100,036
                                                                                                    -------------   -------------
                                                                                                        2,564,456       2,715,337
                                                                                                    -------------   -------------
STANTON CARPET HOLDING CO.
A designer and marketer of high and mid-priced decorative carpets and rugs.
12.13% Senior Subordinated Note due 2014                                 $   2,239,024   08/01/06       2,134,093       2,120,721
Common Stock (B)                                                              311 shs.   08/01/06         310,976          52,810
Warrant, exercisable until 2014, to purchase
  common stock at $.02 per share (B)                                          104 shs.   08/01/06          93,293          17,588
                                                                                                    -------------   -------------
                                                                                                        2,538,362       2,191,119
                                                                                                    -------------   -------------
SUNDANCE INVESTCO LLC
A provider of post-production services to producers of movies and television shows.
Limited Liability Company Unit Class A (B)                                  6,429 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                                  $   2,600,830   09/02/08       2,441,188       2,609,152
Redeemable Preferred Stock Series A (B)                                     1,280 shs.   09/02/08          12,523           9,027
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                       12,803 shs.   09/02/08         112,693            --
                                                                                                    -------------   -------------
                                                                                                        2,566,404       2,618,179
                                                                                                    -------------   -------------
T H I ACQUISITION, INC.
A machine servicing company providing value-added steel services to long steel products.
12% Senior Subordinated Note due 2016                                    $   2,550,000   01/14/08       2,410,946       2,040,000
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                            9 shs.   01/14/08          88,054            --
                                                                                                    -------------   -------------
                                                                                                        2,499,000       2,040,000
                                                                                                    -------------   -------------

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


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
TELECORPS HOLDINGS, INC.
A provider of equipment and services to producers of television shows and motion pictures.
12.75% Senior Subordinated Note due 2016                                 $   3,176,506          *   $   2,785,539   $   3,017,681
Common Stock (B)                                                              270 shs.   09/02/09          10,994            --
Warrant, exercisable until 2019, to purchase
  common stock at $.01 per share (B)                                        7,906 shs.          *         327,437            --
                                                                                                    -------------   -------------
* 05/20/09 and 09/02/09.                                                                                3,123,970       3,017,681
                                                                                                    -------------   -------------
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                                    $   1,162,110          *       1,118,762         928,061
6.79% Term Note due 2012 (C)                                             $   1,366,155          *       1,361,705       1,269,425
8.75% Term Note due 2012 (C)                                             $       1,449          *           1,449           1,347
Limited Partnership Interest of
  Saw Mill Capital Fund V, LLC (B)                                          3.97% int.         **         149,176            --
Warrant, exercisable until 2016, to purchase
  common stock at $.01 per share (B)                                           72 shs.   04/28/06          59,041            --
                                                                                                    -------------   -------------
* 04/28/06 and 09/13/06. ** 03/01/05 and 10/10/08.                                                      2,690,133       2,198,833
                                                                                                    -------------   -------------
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)                              $   2,455,561   10/26/07       2,102,363            --
Series A Preferred Stock (B)                                                  414 shs.   10/26/07         414,051            --
                                                                                                    -------------   -------------
                                                                                                        2,516,414            --
                                                                                                    -------------   -------------
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                                  $     851,351   03/02/07         838,581         808,783
13% Senior Subordinated Note due 2014 (D)                                $     598,450   03/02/07         490,608         299,225
                                                                                                    -------------   -------------
                                                                                                        1,329,189       1,108,008
                                                                                                    -------------   -------------
TRANSPAC HOLDING COMPANY
A designer, importer and wholesaler of home decor and seasonal gift products.
14% Senior Subordinated Note due 2015 (D)                                $   1,773,006   10/31/07       1,649,939       1,684,356
Common Stock (B)                                                              209 shs.   10/31/07         208,589            --
Warrant, exercisable until 2015, to purchase
  common stock at $.01 per share (B)                                           94 shs.   10/31/07          87,607            --
                                                                                                    -------------   -------------
                                                                                                        1,946,135       1,684,356
                                                                                                    -------------   -------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
TRANSTAR HOLDING COMPANY
A distributor of aftermarket automotive transmission parts.
12% Senior Subordinated Note due 2014                                    $   1,734,000   08/31/05   $   1,686,481   $   1,751,340
Common Stock (B)                                                            1,078 shs.          *       1,078,450       1,516,446
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                           86 shs.   08/31/05          77,485         120,843
                                                                                                    -------------   -------------
* 08/31/05 and 04/30/07.                                                                                2,842,416       3,388,629
                                                                                                    -------------   -------------
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                                    $   2,712,000   02/05/98       2,681,582       2,712,000
Common Stock (B)                                                              630 shs.   02/04/98         630,000         746,449
Warrant, exercisable until 2010, to purchase
  common stock at $.01 per share (B)                                          444 shs.   02/05/98         368,832         526,068
                                                                                                    -------------   -------------
                                                                                                        3,680,414       3,984,517
                                                                                                    -------------   -------------
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)                                 $   2,309,541          *       2,141,949       1,385,725
Preferred Stock Series B (B)                                                  241 shs.   10/20/08         241,172            --
Common Stock (B)                                                              742 shs.          *         800,860            --
Warrant, exercisable until 2013, to purchase
  common stock at $.02 per share (B)                                          153 shs.          *         159,894            --
Warrant, exercisable until 2018, to purchase
  common stock at $.01 per share (B)                                        1,054 shs.   10/20/08            --              --
                                                                                                    -------------   -------------
* 07/19/05 and 12/22/05.                                                                                3,343,875       1,385,725
                                                                                                    -------------   -------------
TRUSTILE DOORS, INC.
A manufacturer and distributor of interior doors.
Warrant, exercisable until 2010, to purchase
  common stock at $.01 per share (B)                                        5,781 shs.   04/11/03          68,059          51,863
                                                                                                    -------------   -------------
U M A ENTERPRISES, INC.
An importer and wholesaler of home decor products.
15% Senior Subordinated Note due 2015                                    $   1,773,283   02/08/08       1,747,696       1,762,462
Convertible Preferred Stock (B)                                               887 shs.   02/08/08         886,956         420,405
                                                                                                    -------------   -------------
                                                                                                        2,634,652       2,182,867
                                                                                                    -------------   -------------

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


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

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
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                                  $   1,882,100   04/30/04   $   1,805,456   $   1,787,995
14.5% PIK Note due 2012                                                  $     272,292   10/06/09         232,400         258,677
Common Stock (B)                                                              182 shs.   04/30/04         182,200          13,260
Warrant, exercisable until 2012, to purchase
  common stock at $.01 per share (B)                                          230 shs.   04/30/04         211,736          16,770
                                                                                                    -------------   -------------
                                                                                                        2,431,792       2,076,702
                                                                                                    -------------   -------------
VISIONEERING, INC.
A designer and manufacturer of tooling and fixtures for the aerospace industry.
10.5% Senior Secured Term Loan due 2013                                  $     802,941   05/17/07         790,897         793,868
13% Senior Subordinated Note due 2014                                    $     648,530   05/17/07         595,643         637,587
18% PIK Convertible Preferred Stock (B)                                    37,381 shs.   03/13/09          72,519          58,015
Common Stock (B)                                                          123,529 shs.   05/17/07         123,529            --
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                       35,006 shs.   05/17/07         55,055             --
                                                                                                    -------------   -------------
                                                                                                        1,637,643       1,489,470
                                                                                                    -------------   -------------
VITEX PACKAGING GROUP, INC.
A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags.
10% Senior Subordinated PIK Note due 2011                                $     165,165   10/29/09         150,904         156,907
5% Senior Subordinated PIK Note due 2011 (D)                             $     850,000   06/30/07         741,532         807,500
Class B Unit (B)                                                          767,881 uts.   10/29/09         348,058            --
Class C Unit (B)                                                          850,000 uts.   10/29/09         780,572         196,578
Limited Liability Company Unit Class A (B)                                723,465 uts.          *         433,222            --
Limited Liability Company Unit Class B (B)                                182,935 uts.   07/19/04         182,935            --
                                                                                                    -------------   -------------
* 07/19/04 and 10/29/09.                                                                                2,637,223       1,160,985
                                                                                                    -------------   -------------
WAGGIN' TRAIN HOLDINGS LLC
A producer of premium quality meat dog treats.
14% Senior Subordinated Note due 2014                                    $   2,241,855   11/15/07       2,196,409       2,264,274
Limited Liability Company Unit Class B (B)                                    423 uts.   11/15/07         422,652         510,171
Limited Liability Company Unit Class C (B)                                    423 uts.   11/15/07            --           415,292
                                                                                                    -------------   -------------
                                                                                                        2,619,061       3,189,737
                                                                                                    -------------   -------------
WALLS INDUSTRIES, INC.
A provider of branded workwear and sporting goods apparel.
Limited Partnership Interest (B)                                            0.40% int.   07/12/04           3,728            --
Common Stock (B)                                                            4,028 shs.   12/21/07            --              --
                                                                                                    -------------   -------------
                                                                                                            3,728            --
                                                                                                    -------------   -------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                       PRINCIPAL AMOUNT,
                                                                         SHARES, UNITS,
                                                                          OR OWNERSHIP  ACQUISITION
CORPORATE RESTRICTED SECURITIES:(A) CONTINUED                              PERCENTAGE      DATE          COST        FAIR VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
WELLBORN FOREST HOLDING CO.
A manufacturer of semi-custom kitchen and bath cabinetry.
14.13% Senior Subordinated Note due 2014                                 $   1,721,250   11/30/06   $   1,621,114   $   1,635,188
Common Stock (B)                                                              191 shs.   11/30/06         191,250          29,705
Warrant, exercisable until 2014, to purchase
  common stock at $.01 per share (B)                                           95 shs.   11/30/06          86,493          14,830
                                                                                                    -------------   -------------
                                                                                                        1,898,857       1,679,723
                                                                                                    -------------   -------------
WHEATON HOLDING CORPORATION
A distrtibutor and manufacturer of laboratory supply products and packaging.
13% Senior Subordinated Note due 2017                                    $   3,000,000   06/08/10       2,728,931       3,000,000
Preferred Stock Series B (B)                                                2,109 shs.   06/08/10         210,924              21
Common Stock (B)                                                            1,058 shs.   06/08/10           1,058              11
                                                                                                    -------------   -------------
                                                                                                        2,940,913       3,000,032
                                                                                                    -------------   -------------
WORKPLACE MEDIA HOLDING CO.
A direct marketer specializing in providing advertisers with access to consumers in the workplace.
13% Senior Subordinated Note due 2015                                    $   1,159,196   05/14/07       1,073,816         811,437
Limited Partnership Interest (B)                                           23.16% int.   05/14/07         115,804            --
Warrant, exercisable until 2015, to purchase
  common stock at $.02 per share (B)                                           88 shs.   05/14/07          83,462            --
                                                                                                    -------------   -------------
                                                                                                        1,273,082         811,437
                                                                                                    -------------   -------------
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)                              $   2,322,844   09/08/08       2,272,887       1,161,422
Common Stock (B)                                                              283 shs.   09/08/08         283,333            --
                                                                                                    -------------   -------------
                                                                                                        2,556,220       1,161,422
                                                                                                    -------------   -------------
TOTAL PRIVATE PLACEMENT INVESTMENTS (E)                                                               219,892,503     191,058,029
                                                                                                    -------------   -------------

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


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

                                                             INTEREST      DUE         PRINCIPAL                       MARKET
CORPORATE RESTRICTED SECURITIES:(A) (CONTINUED)                RATE        DATE         AMOUNT           COST           VALUE
---------------------------------------------------------------------------------------------------------------------------------
RULE 144A SECURITIES - 6.65%:
                                                                                                      
BONDS - 6.60%
Advanced Micro Devices, Inc.                                   8.125%    12/15/17    $    750,000     $   715,598    $    744,375
Appleton Papers, Inc.                                         11.250     12/15/15         303,000         300,000         249,975
Avis Budget Car Rental LLC                                     9.625     03/15/18          85,000          83,839          85,213
Cemex Finance LLC                                              9.500     12/14/16         375,000         392,275         361,828
Cenveo Corporation                                            10.500     08/15/16         100,000         100,000         101,750
Clear Channel Worldwide Holdings, Inc.                         9.250     12/15/17         750,000         750,000         753,750
Coffeyville Resources LLC                                      9.000     04/01/15         140,000         139,315         138,600
Compucom Systems, Inc.                                        12.500     10/01/15       1,330,000       1,294,993       1,401,488
Cricket Communications, Inc.                                   9.375     11/01/14         750,000         754,730         761,250
Dae Aviation Holdings, Inc.                                   11.250     08/01/15         200,000         195,078         198,000
Eastman Kodak Co.                                              9.750     03/01/18         750,000         735,152         740,625
Easton-Bell Sports, Inc.                                       9.750     12/01/16         320,000         328,000         331,200
Energy Future Holdings                                        10.000     01/15/20         100,000         100,000          99,750
G F S I, Inc. (C)                                             10.500     06/01/11         715,000         685,658         532,675
Gannett Company, Inc.                                          9.375     11/15/17         125,000         123,228         132,188
Geoeye, Inc.                                                   9.625     10/01/15         750,000         776,768         765,000
Georgia Gulf Corporation                                       9.000     01/15/17         190,000         195,106         192,850
Gray Television, Inc.                                         10.500     06/29/15         500,000         475,179         490,000
Great Atlantic & Pacific Tea Co.                              11.375     08/01/15          35,000          34,185          29,138
International Lease Finance Corporation                        8.625     09/15/15         140,000         137,859         132,650
JohnsonDiversey, Inc.                                          8.250     11/15/19         100,000          99,170         102,750
Lamar Media Corporation                                        8.000     11/01/17         195,000         195,000         200,850
Landry's Restaurants, Inc.                                     7.875     04/15/18         125,000         125,000         125,781
L B I Escrow Corporation                                      11.625     12/01/15         125,000         134,219         130,313
Level 3 Financing, Inc.                                       10.000     02/01/18         750,000         745,641         663,750
Libbey Glass, Inc.                                            10.000     02/15/15         125,000         131,126         130,000
LIN Television Corporation                                     8.375     04/15/18         190,000         192,572         190,000
Magnachip Semiconductor                                       10.500     04/15/18         180,000         180,655         181,350
McClatchy Co.                                                 11.500     02/15/17         275,000         271,766         279,125
Michael Foods, Inc.                                            9.750     07/15/18          75,000          75,000          77,063
Nexstar Broadcasting Group, Inc.                               8.875     04/15/17         175,000         173,887         176,750
Packaging Dynamics Corporation of America                     10.000     05/01/16       1,200,000       1,194,751       1,002,000
Pinnacle Foods Finance LLC                                     9.250     04/01/15          75,000          75,000          76,500
Reddy Ice Corporation                                         13.250     11/01/15         150,000         153,946         144,750
SandRidge Energy, Inc.                                         8.000     06/01/18         360,000         363,882         341,100

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                                       SHARES OR
                                                             INTEREST      DUE         PRINCIPAL                       MARKET
CORPORATE RESTRICTED SECURITIES:(A) (CONTINUED)                RATE        DATE         AMOUNT           COST           VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
SandRidge Energy, Inc.                                         8.750%    01/15/20    $    750,000    $    744,973    $    712,500
Sinclair Television Group, Inc.                                9.250     11/01/17         425,000         414,051         429,250
Spectrum Brands, Inc.                                          9.500     06/15/18         125,000         123,290         129,686
Trimas Corporation                                             9.750     12/15/17          75,000          73,553          75,750
Tunica-Biloxi Gaming Authority                                 9.000     11/15/15       1,075,000       1,097,853         962,125
Univision Comunications, Inc.                                 12.000     07/01/14         200,000         214,020         214,500
ViaSystems, Inc.                                              12.000     01/15/15         175,000         169,126         189,000
West Corporation                                              11.000     10/15/16         150,000         159,111         152,625
                                                                                                     ------------    ------------
  TOTAL BONDS                                                                                          15,424,555      14,929,823
                                                                                                     ------------    ------------
CONVERTIBLE PREFERRED STOCK - 0.00%
ETEX Corporation (B)                                                                          777             716            --
                                                                                                     ------------    ------------
  TOTAL CONVERTIBLE PREFERRED STOCK                                                                           716            --
                                                                                                     ------------    ------------
PREFERRED STOCK - 0.05%
General Motors Acceptance Corporation, Inc.                                                   143          45,009         111,151
TherOX, Inc. (B)                                                                              103           4,131            --
                                                                                                     ------------    ------------
  TOTAL PREFERRED STOCK                                                                                    49,140         111,151
                                                                                                     ------------    ------------
COMMON STOCK - 0.00%
Touchstone Health Partnership (B)                                                           1,168           4,254            --
                                                                                                     ------------    ------------
  TOTAL COMMON STOCK                                                                                        4,254            --
                                                                                                     ------------    ------------

  Total Rule 144A Securities                                                                           15,478,665      15,040,974
                                                                                                     ------------    ------------
TOTAL CORPORATE RESTRICTED SECURITIES                                                                $235,371,168    $206,099,003
                                                                                                     ------------    ------------

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


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

                                                             INTEREST      DUE         PRINCIPAL                       MARKET
CORPORATE PUBLIC SECURITIES - 17.51%: (A)                      RATE        DATE         AMOUNT           COST           VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
BONDS - 16.64%
A M C Entertainment, Inc.                                     11.000%    02/01/16     $  1,000,000   $ 1,003,291    $  1,050,000
ACCO Brands Corporation                                       10.625     03/15/15          100,000        98,662         108,500
Affinia Group, Inc.                                            9.000     11/30/14           50,000        48,500          50,250
American Axle & Manufacturing Holding, Inc.                    7.875     03/01/17          750,000       608,625         650,625
American General Finance Corporation                           6.500     09/15/17          375,000       322,500         292,500
Atlas Pipeline Partners                                        8.125     12/15/15          750,000       663,750         690,000
Berry Plastics Corporation                                     8.875     09/15/14          750,000       705,000         721,875
Berry Plastics Corporation (C)                                 5.053     02/15/15          500,000       478,686         473,750
Boyd Gaming Corporation                                        7.125     02/01/16          700,000       630,500         575,750
Boyd Gaming Corporation                                        6.750     04/15/14          150,000       137,250         131,250
Brigham Exploration Co.                                        9.625     05/01/14        1,000,000       970,645       1,005,000
C I T Group, Inc.                                              7.000     05/01/15          415,000       386,988         382,838
Cenveo Corporation                                             7.875     12/01/13        1,300,000     1,192,500       1,248,000
Chaparral Energy, Inc.                                         8.875     02/01/17        1,000,000       991,780         920,000
Crosstex Energy L.P.                                           8.875     02/15/18          225,000       220,445         224,719
Dynegy Holdings, Inc.                                          7.750     06/01/19          830,000       564,400         573,738
Exide Corporation                                             10.500     03/15/13          430,000       432,158         434,300
Ford Motor Credit Co.                                          8.000     06/01/14          125,000       106,282         129,375
Ford Motor Credit Co.                                          7.450     07/16/31          500,000       441,500         451,250
Gencorp, Inc.                                                  9.500     08/15/13          259,000       259,000         261,914
Goodyear Tire & Rubber Co.                                    10.500     05/15/16          100,000        96,326         108,750
Great Lakes Dredge & Dock Corporation                          7.750     12/15/13        1,000,000       948,750         990,000
Harrah's Operating Co.                                        11.250     06/01/17          325,000       313,760         342,063
Hawker Beechcraft Acquisition Co.                              9.750     04/01/17        1,000,000     1,006,785         617,500
Headwaters, Inc.                                              11.375     11/01/14          500,000       518,431         505,000
Hertz Corporation                                             10.500     01/01/16          750,000       775,208         778,125
Hexion Finance Escrow LLC                                      8.875     02/01/18          375,000       358,725         338,438
Intelsat Bermuda Ltd.                                          9.250     06/15/16        1,365,000     1,405,402       1,354,763
Interline Brands, Inc.                                         8.125     06/15/14        1,000,000       992,541       1,001,250
International Coal Group, Inc.                                 9.125     04/01/18          125,000       124,123         125,000
International Lease Finance Corporation                        5.875     05/01/13          750,000       672,250         691,875
Kar Holdings, Inc.                                             8.750     05/01/14           50,000        50,000          50,250
Landry's Restaurants, Inc.                                    11.625     12/01/15           40,000        42,760          41,400
Liberty Media Corporation                                      5.700     05/15/13        1,000,000       951,610       1,022,500
Manitowoc Company, Inc.                                        7.125     11/01/13          200,000       200,000         193,000
Markwest Energy Operating Co.                                  8.750     04/15/18          125,000       123,979         126,250
Markwest Energy Operating Co.                                  6.875     11/01/14           70,000        55,578          67,200
National Mentor Holdings, Inc.                                11.250     07/01/14          375,000       374,531         374,063
Nebraska Book Company, Inc.                                    8.625     03/15/12          750,000       676,875         695,625

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                                                       SHARES OR
                                                             INTEREST      DUE         PRINCIPAL                       MARKET
CORPORATE PUBLIC SECURITIES:(A) (CONTINUED)                    RATE        DATE         AMOUNT           COST           VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
Newark Group, Inc.                                             9.750%    03/15/14    $    850,000     $   796,863    $    571,625
Nortek, Inc.                                                  11.000     12/01/13         175,778         173,174         183,249
NXP Funding LLC                                                9.500     10/15/15         750,000         738,750         628,125
Omnicare, Inc.                                                 7.750     06/01/20          75,000          75,000          76,500
Owens Corning, Inc.                                            9.000     06/15/19          55,000          54,112          63,663
Polypore, Inc.                                                 8.750     05/15/12       1,000,000         965,000       1,002,500
Pregis Corporation                                            12.375     10/15/13       1,000,000         981,490         988,750
Quebecor Media, Inc.                                           7.750     03/15/16       1,050,000         978,235       1,029,000
Quiksilver, Inc.                                               6.875     04/15/15         315,000         290,463         286,256
RailAmerica, Inc.                                              9.250     07/01/17         240,000         230,589         251,400
Rental Service Corporation                                     9.500     12/01/14         750,000         728,567         745,313
Rite Aid Corporation                                          10.250     10/15/19         175,000         190,344         174,344
Sabre Holdings Corporation                                     8.350     03/15/16         500,000         455,000         477,500
Sanmina-SCI Corporation                                        8.125     03/01/16         375,000         374,063         369,375
Seneca Gaming Corporation                                      7.250     05/01/12         500,000         477,500         488,750
Sheridan Acquisition Corporation                              10.250     08/15/11         375,000         370,001         370,781
Sprint Capital Corporation                                     6.900     05/01/19         625,000         575,531         565,625
Stanadyne Corporation                                         10.000     08/15/14       1,000,000       1,000,000         910,000
Stewart & Stevenson LLC                                       10.000     07/15/14       1,465,000       1,490,208       1,333,150
Teck Resources Ltd.                                           10.750     05/15/19          65,000          61,926          79,645
Tekni-Plex, Inc.                                               8.750     11/15/13         650,000         653,359         509,438
Tenneco, Inc.                                                  8.125     11/15/15       1,100,000         540,000       1,105,500
Texas Industries, Inc.                                         7.250     07/15/13          70,000          70,000          67,725
Thermadyne Holdings Corporation                               11.500     02/01/14         115,000         115,869         116,438
Ticketmaster Entertainment, Inc.                              10.750     07/28/16         500,000         500,000         538,750
Titan International, Inc.                                      8.000     01/15/12       1,070,000       1,062,100       1,112,800
Tube City IMS Corporation                                      9.750     02/01/15       1,000,000         966,118         967,500
United Components, Inc.                                        9.375     06/15/13       1,080,000       1,079,726       1,085,400
United Rentals, Inc.                                          10.875     06/15/16         125,000         121,478         134,063
Verso Paper Holdings LLC                                      11.375     08/01/16         175,000         170,250         149,180
Verso Paper Holdings LLC                                       9.125     08/01/14         350,000         340,375         334,250
Waste Services, Inc.                                           9.500     04/15/14       1,100,000       1,114,521       1,127,500
                                                                                                     ------------    ------------
  TOTAL BONDS                                                                                          37,690,708      37,642,781
                                                                                                     ------------    ------------

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


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

                                                                                                                        MARKET
CORPORATE PUBLIC SECURITIES:(A) (CONTINUED)                                                 SHARES           COST        VALUE
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
COMMON STOCK - 0.87%
Bally Total Fitness Holding Corporation (B)                                                    29     $         2    $       --
Chase Packaging Corporation (B)                                                             9,541            --               477
CKX, Inc. (B)                                                                              97,500         784,875         486,525
Directed Electronics, Inc. (B)                                                            368,560       1,856,534         195,337
El Paso Corporation (B)                                                                    65,000         808,362         722,150
Intrepid Potash, Inc. (B)                                                                     365          11,680           7,143
ITC^DeltaCom, Inc. (B)                                                                    178,666       1,563,327         259,066
Nortek, Inc. (B)                                                                              175               1           7,350
Rue21, Inc. (B)                                                                               650          12,350          19,721
Supreme Industries, Inc.                                                                  125,116         267,319         270,251
                                                                                                     ------------    ------------
  TOTAL COMMON STOCK                                                                                    5,304,450       1,968,020
                                                                                                     ------------    ------------

TOTAL CORPORATE PUBLIC SECURITIES                                                                    $ 42,995,158    $ 39,610,801
                                                                                                     ------------    ------------

                                                             INTEREST      DUE         PRINCIPAL                      MARKET
SHORT-TERM SECURITIES:                                      RATE/YIELD     DATE         AMOUNT           COST          VALUE
---------------------------------------------------------------------------------------------------------------------------------
COMMERCIAL PAPER - 1.88%
Citigroup Funding, Inc.                                        0.250%    07/09/10    $  2,500,000    $  2,499,861    $  2,499,861
Wisconsin Electric Power Co.                                   0.180     07/06/10       1,750,000       1,749,956       1,749,956
                                                                                                     ------------    ------------
  TOTAL SHORT-TERM SECURITIES                                                                        $  4,249,817    $  4,249,817
                                                                                                     ------------    ------------
TOTAL INVESTMENTS                                             110.49%                                $282,616,143    $249,959,621
                                                                                                     ============    ------------
  Other Assets                                                  3.32                                                    7,513,587
  Liabilities                                                 (13.81)                                                 (31,243,214)
                                                              ------                                                 ------------
TOTAL NET ASSETS                                              100.00%                                                $226,229,994
                                                              ======                                                 ============



(A) In each of the convertible note, warrant, convertible preferred and common stock investments, the issuer has agreed to provide
    certain registration rights.
(B) Non-income producing security.
(C) Variable rate security; rate indicated is as of 06/30/10.
(D) Defaulted security; interest not accrued.
(E) Illiquid securities. As of June 30, 2010, the value of these securities amounted to $191,058,029 or 84.45% of net assets.
 ^  Effective yield at purchase
PIK - Payment-in-kind


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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value          Industry Classification                          Market Value
------------------------------------------------------------          ------------------------------------------------------------
                                                                                                             
AEROSPACE - 3.94%                                                     BROADCASTING & ENTERTAINMENT - 2.45%
A E Company, Inc.                               $  3,168,184          CKX, Inc.                                       $    486,525
Dae Aviation Holdings, Inc.                          198,000          Clear Channel Worldwide Holdings, Inc.               753,750
Gencorp, Inc.                                        261,914          Geoeye, Inc.                                         765,000
P A S Holdco LLC                                   3,803,970          Gray Television, Inc.                                490,000
Visioneering, Inc.                                 1,489,470          Lamar Media Corporation                              200,850
                                                ------------          Liberty Media Corporation                          1,022,500
                                                   8,921,538          LIN Television Corporation                           190,000
                                                ------------          Nexstar Broadcasting Group, Inc.                     176,750
AUTOMOBILE - 5.50%                                                    Sinclair Television Group, Inc.                      429,250
American Axle & Manufacturing Holding, Inc.          650,625          Univision Communications, Inc.                       214,500
Exide Corporation                                    434,300          Workplace Media Holding Co.                          811,437
Goodyear Tire & Rubber Co.                           108,750                                                          ------------
Jason, Inc.                                           48,184                                                             5,540,562
Nyloncraft, Inc.                                   1,021,875                                                          ------------
Ontario Drive & Gear Ltd.                            609,327          BUILDINGS & REAL ESTATE - 1.12%
Qualis Automotive LLC                              2,886,238          K W P I Holdings Corporation                       2,350,726
Tenneco, Inc.                                      1,105,500          Owens Corning, Inc.                                   63,663
Titan International, Inc.                          1,112,800          Texas Industries, Inc.                                67,725
Transtar Holding Company                           3,388,629          TruStile Doors, Inc.                                  51,863
United Components, Inc.                            1,085,400                                                          ------------
                                                ------------                                                             2,533,977
                                                  12,451,628                                                          ------------
                                                ------------          CHEMICAL, PLASTICS & RUBBER - 0.65%
BEVERAGE, DRUG & FOOD - 6.85%                                         Capital Specialty Plastics, Inc.                   1,126,577
Eatem Holding Company                              3,014,553          Hexion Finance Escrow LLC                            338,438
Golden County Foods Holding, Inc.                  2,284,126                                                          ------------
Hospitality Mints Holding Company                  2,076,787                                                             1,465,015
Landry's Restaurants, Inc.                           167,181                                                          ------------
L H D Europe Holding, Inc.                            24,225
Michael Foods, Inc.                                   77,063
Spartan Foods Holding Company                      1,940,320
Specialty Commodities, Inc.                        2,715,337
Waggin' Train Holdings LLC                         3,189,737
                                                ------------
                                                  15,489,329
                                                ------------

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


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

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value          Industry Classification                          Market Value
------------------------------------------------------------          ------------------------------------------------------------
                                                                                                             
CONSUMER PRODUCTS - 10.29%                                            DIVERSIFIED/CONGLOMERATE, MANUFACTURING - 8.99%
Aero Holdings, Inc.                             $  2,928,238          A H C Holding Company, Inc.                     $  2,870,960
Bravo Sports Holding Corporation                   2,493,009          Arrow Tru-Line Holdings, Inc.                      1,611,581
Custom Engineered Wheels, Inc.                     2,577,125          C D N T, Inc.                                      1,375,582
Eastman Kodak Co.                                    740,625          Great Lakes Dredge & Dock Corporation                990,000
Easton-Bell Sports, Inc.                             331,200          Headwaters, Inc.                                     505,000
G F S I, Inc.                                        532,675          K P I Holdings, Inc.                               1,790,544
JohnsonDiversey, Inc.                                102,750          MEGTEC Holdings, Inc.                              2,052,966
K N B Holdings Corporation                         2,259,666          Milwaukee Gear Company                             2,118,461
Kar Holdings, Inc.                                    50,250          Nortek, Inc.                                         190,599
Manhattan Beachwear Holding Company                3,018,221          Polypore, Inc.                                     1,002,500
Momentum Holding Co.                                 497,958          O E C Holdings Corporation                         1,497,219
R A J Manufacturing Holdings LLC                   2,442,844          Postle Aluminum Company LLC                        1,601,424
Reddy Ice Corporation                                144,750          Thermadyne Holdings Corporation                      116,438
Royal Baths Manufacturing Company                  1,173,334          Trimas Corporation                                    75,750
The Tranzonic Companies                            3,984,517          Truck Bodies & Equipment International             1,385,725
Walls Industries, Inc.                                  --            Xaloy Superior Holdings, Inc.                      1,161,422
                                                ------------                                                          ------------
                                                  23,277,162                                                            20,346,171
                                                ------------                                                          ------------
CONTAINERS, PACKAGING & GLASS - 4.92%                                 DIVERSIFIED/CONGLOMERATE, SERVICE - 12.08%
Berry Plastics Corporation                         1,195,625          A S C Group, Inc.                                  2,591,203
Chase Packaging Corporation                              477          A W X Holdings Corporation                         1,340,039
Flutes, Inc.                                         229,596          ACCO Brands Corporation                              108,500
Maverick Acquisition Company                         578,460          Advanced Technologies Holdings                     2,628,141
P I I Holding Corporation                          3,065,167          Affinia Group, Inc.                                   50,250
Packaging Dynamics Corporation of America          1,002,000          Apex Analytix Holding Corporation                  2,461,712
Paradigm Packaging, Inc.                           2,398,489          Clough, Harbour, and Associates                    2,785,320
Pregis Corporation                                   988,750          Crane Rental Corporation                           2,353,804
Tekni-Plex, Inc.                                     509,438          Diversco, Inc./DHI Holdings, Inc.                  2,970,629
Vitex Packaging Group, Inc.                        1,160,985          Dwyer Group, Inc.                                  1,549,834
                                                ------------          Insurance Claims Management, Inc.                    287,161
                                                  11,128,987          Interline Brands, Inc.                             1,001,250
                                                ------------          Mail Communications Group, Inc.                    1,354,393
DISTRIBUTION - 1.74%                                                  Nesco Holdings Corporation                         2,770,950
Duncan Systems, Inc.                               1,477,194          Northwest Mailing Services, Inc.                   2,605,061
F C X Holdings Corporation                         2,468,868          Pearlman Enterprises, Inc.                              --
                                                ------------          Sabre Holdings Corporation                           477,500
                                                   3,946,062                                                          ------------
                                                ------------                                                            27,335,747
                                                                                                                      ------------

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


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value          Industry Classification                          Market Value
------------------------------------------------------------          ------------------------------------------------------------
                                                                                                             
ELECTRONICS - 0.64%                                                   HOME & OFFICE FURNISHINGS, HOUSEWARES &
Connecticut Electric, Inc.                      $    873,857          DURABLE CONSUMER PRODUCTS - 8.68%
Directed Electronics, Inc.                           195,337          Connor Sport Court International, Inc.          $  2,614,058
Sanmina-SCI Corporation                              369,375          H M Holding Company                                  513,825
                                                ------------          Home Decor Holding Company                         2,411,706
                                                   1,438,569          Justrite Manufacturing Acquisition Co.             1,795,925
                                                ------------          K H O F Holdings, Inc.                               270,607
FINANCIAL SERVICES - 2.56%                                            Libbey Glass, Inc.                                   130,000
American General Finance Corporation                 292,500          Monessen Holding Corporation                       1,671,395
C I T Group, Inc.                                    382,838          Quiksilver, Inc.                                     286,256
Cemex Finance LLC                                    361,828          Spectrum Brands, Inc.                                129,686
Citigroup Funding, Inc.                            2,499,861          Stanton Carpet Holding Co.                         2,191,119
Ford Motor Credit Co.                                580,625          Transpac Holding Company                           1,684,356
General Motors Acceptance Corporation, Inc.          111,151          U M A Enterprises, Inc.                            2,182,867
Hawker Beechcraft Acquisition Co.                    617,500          U-Line Corporation                                 2,076,702
Highgate Capital LLC                                    --            Wellborn Forest Holding Co.                        1,679,723
International Lease Finance Corporation              824,525                                                          ------------
L B I Escrow Corporation                             130,313                                                            19,638,225
                                                ------------                                                          ------------
                                                   5,801,141          LEISURE, AMUSEMENT & ENTERTAINMENT - 3.08%
                                                ------------          A M C Entertainment, Inc.                          1,050,000
HEALTHCARE, EDUCATION & CHILDCARE - 4.44%                             Bally Total Fitness Holding Corporation                 --
American Hospice Management                                           Boyd Gaming Corporation                              707,000
Holding LLC                                        4,041,424          Harrah's Operating Escrow LLC                        342,063
F H S Holdings LLC                                      --            Savage Sports Holding, Inc.                        2,875,296
National Mentor Holdings, Inc.                       374,063          Seneca Gaming Corporation                            488,750
Synteract Holdings Corporation                     2,618,179          Ticketmaster Entertainment, Inc.                     538,750
Touchstone Health Partnership                           --            Tunica-Biloxi Gaming Authority                       962,125
Wheaton Holding Corporation                        3,000,032                                                          ------------
                                                ------------                                                             6,963,984
                                                  10,033,698                                                          ------------
                                                ------------

----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                35


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

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value          Industry Classification                          Market Value
------------------------------------------------------------          ------------------------------------------------------------
                                                                                                             
MACHINERY - 9.29%                                                     NATURAL RESOURCES - 1.53%
A S A P Industries LLC                          $  1,198,931          Appleton Papers, Inc.                           $    249,975
Davis-Standard LLC                                 2,347,977          Cenveo Corporation                                 1,349,750
E S P Holdco, Inc.                                 2,326,403          Georgia Culf Corporation                             192,850
K-Tek Holdings Corporation                         3,054,261          International Coal Group, Inc.                       125,000
M V I Holding, Inc.                                1,175,484          Intrepid Potash, Inc.                                  7,143
Manitowoc Company, Inc.                              193,000          SandRidge Energy, Inc.                             1,053,600
Navis Global                                         578,746          Verso Paper Holdings LLC                             483,430
NetShape Technologies, Inc.                        1,219,428                                                          ------------
Pacific Consolidated Holdings LLC                  1,237,206                                                             3,461,748
Power Services Holding Company                     2,338,352                                                          ------------
R E I Delaware Holding, Inc.                       2,551,485          OIL & GAS - 2.85%
Safety Speed Cut Manufacturing Company, Inc.         274,395          Atlas Pipeline Partners                              690,000
Stanadyne Corporation                                910,000          Brigham Exploration Co.                            1,005,000
Stewart & Stevenson LLC                            1,333,150          Coffeyville Resources LLC                            138,600
Supreme Industries, Inc.                             270,251          Chaparral Energy, Inc.                               920,000
                                                ------------          International Offshore Services LLC                2,581,340
                                                  21,009,069          Total E & S, Inc.                                  1,108,008
                                                ------------                                                          ------------
MEDICAL DEVICES/BIOTECH - 3.91%                                                                                          6,442,948
Coeur, Inc.                                        1,337,821                                                          ------------
E X C Acquisition Corporation                         61,082          PHARMACEUTICALS - 1.21%
ETEX Corporation                                        --            CorePharma LLC                                     2,737,630
MedSystems Holdings LLC                            1,369,618                                                          ------------
MicroGroup, Inc.                                   2,282,772          PUBLISHING/PRINTING - 1.05%
OakRiver Technology, Inc.                          1,117,517          Gannett Company, Inc.                                132,188
Omnicare, Inc.                                        76,500          McClatchy Co.                                        279,125
Precision Wire Holding Company                     2,604,283          Newark Group, Inc.                                   571,625
TherOX, Inc.                                            --            Quebecor Media, Inc.                               1,029,000
                                                ------------          Sheridan Acquisition Corporation                     370,781
                                                   8,849,593                                                          ------------
                                                ------------                                                             2,382,719
MINING, STEEL, IRON & NON-PRECIOUS                                                                                    ------------
METALS - 1.36%                                                        RETAIL STORES - 0.92%
T H I Acquisition, Inc.                            2,040,000          Bon-Ton Stores, Inc.
Teck Resources Ltd.                                   79,645          Great Atlantic & Pacific Tea Co.                      29,138
Tube City IMS Corporation                            967,500          Nebraska Book Company, Inc.                          695,625
                                                ------------          Olympic Sales, Inc.                                  199,361
                                                   3,087,145          Pinnacle Foods Finance LLC                            76,500
                                                ------------          Rental Service Corporation                           745,313
                                                                      Rite Aid Corporation                                 174,344
                                                                      Rue21, Inc.                                           19,721
                                                                      United Rentals, Inc.                                 134,063
                                                                                                                      ------------
                                                                                                                         2,074,065
                                                                                                                      ------------

See Notes to Consolidated Financial Statements
----------------------------------------------------------------------------------------------------------------------------------
36


                                                  MassMutual Corporate Investors
CONSOLIDATED SCHEDULE OF INVESTMENTS (CONTINUED)
JUNE 30, 2010
(Unaudited)

                                                 Fair Value/                                                           Fair Value/
Industry Classification                         Market Value          Industry Classification                          Market Value
------------------------------------------------------------          ------------------------------------------------------------
                                                                                                             
TECHNOLOGY - 3.21%                                                    WASTE MANAGEMENT/POLLUTION - 1.47%
Advanced Micro Devices, Inc.                    $    744,375          Terra Renewal LLC                               $  2,198,833
Compucom Systems, Inc.                             1,401,488          Torrent Group Holdings, Inc.                            --
Magnachip Semiconductor                              181,350          Waste Services, Inc.                               1,127,500
NXP Funding LLC                                      628,125                                                          ------------
Sencore Holding Company                            1,531,035                                                             3,326,333
Smart Source Holdings LLC                          2,573,887                                                          ------------
ViaSystems, Inc.                                     189,000
                                                ------------          Total Investments - 110.49%                     $249,959,621
                                                   7,249,260                                                          ============
                                                ------------
TELECOMMUNICATIONS - 3.55%
All Current Holding Company                        1,261,555
Cricket Communications, Inc.                         761,250
Intelsat Bermuda Ltd.                              1,354,763
ITC^DeltaCom, Inc.                                   259,066
Level 3 Financing, Inc.                              663,750
Sprint Capital Corporation                           565,625
Sundance Investco LLC                                   --
Telecorps Holdings, Inc.                           3,017,681
West Corporation                                     152,625
                                                ------------
                                                   8,036,315
                                                ------------
TRANSPORTATION - 0.63%
Avis Budget Car Rental LLC                            85,213
Hertz Corporation                                    778,125
NABCO, Inc.                                          312,500
RailAmerica, Inc.                                    251,400
                                                ------------
                                                   1,427,238
                                                ------------
UTILITIES - 1.58%
Crosstex Energy, L.P.                                224,719
Dynegy Holdings, Inc.                                573,738
El Paso Corporation                                  722,150
Energy Future Holdings                                99,750
Markwest Energy Operating Co.                        193,450
Wisconsin Electric Power                           1,749,956
                                                ------------
                                                   3,563,763
                                                ------------


See Notes to Consolidated Financial Statements
----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                37


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(UNAUDITED)

1.    HISTORY
      MassMutual  Corporate Investors (the "Trust") commenced operations in 1971
      as   a  Delaware  corporation.  Pursuant  to  an  Agreement  and  Plan  of
      Reorganization  dated  November  14,  1985,  approved by shareholders, the
      Trust  was reorganized as a Massachusetts business trust under the laws of
      the Commonwealth of Massachusetts, effective November 28, 1985.

      The  Trust  is  a  diversified  closed-end  management investment company.
      Babson  Capital Management LLC ("Babson Capital"), a wholly-owned indirect
      subsidiary  of Massachusetts Mutual Life Insurance Company ("MassMutual"),
      acts  as  its  investment  adviser. The Trust's investment objective is to
      maintain a portfolio of securities providing a fixed yield and at the same
      time  offering  an  opportunity  for  capital gains. The Trust's principal
      investments  are  privately placed, below-investment grade, long-term debt
      obligations   with   equity  features  such  as  common  stock,  warrants,
      conversion  rights,  or other equity features and, occasionally, preferred
      stocks.  The  Trust  typically  purchases these investments, which are not
      publicly  tradable,  directly  from  their  issuers  in  private placement
      transactions.  These  investments are typically mezzanine debt instruments
      with accompanying private equity securities made to small or middle market
      companies.  In  addition,  the  Trust  may  temporarily invest, subject to
      certain limitations, in marketable investment grade debt securities, other
      marketable   debt   securities   (including  high  yield  securities)  and
      marketable  common stocks. Below-investment grade or high yield securities
      have   predominantly  speculative  characteristics  with  respect  to  the
      capacity of the issuer to pay interest and repay capital.

      On  January  27, 1998, the Board of Trustees authorized the formation of a
      wholly-owned  subsidiary  of  the  Trust ("MMCI Subsidiary Trust") for the
      purpose  of  holding  certain  investments. The results of MMCI Subsidiary
      Trust  are consolidated in the accompanying financial statements. Footnote
      2.D  below  discusses  the Federal tax consequences of the MMCI Subsidiary
      Trust.

2.    SIGNIFICANT ACCOUNTING POLICIES
      The  following  is  a  summary of significant accounting policies followed
      consistently by the Trust in the preparation of its consolidated financial
      statements  in conformity with accounting principles generally accepted in
      the United States of America.

      A. VALUATION OF INVESTMENTS:
      Valuation  of  a security in the Trust's portfolio is made on the basis of
      market  price  whenever  market  quotations  are readily available and all
      securities of the same class held by the Trust can be readily sold in such
      market.

      Nearly  all  securities  which are acquired by the Trust directly from the
      issuers  and  shares  into which such securities may be converted or which
      may  be  purchased on the exercise of warrants attached to such securities
      will  be  subject  to  legal or contractual delays in, or restrictions on,
      resale  and will therefore be "restricted securities." Generally speaking,
      as  contrasted with open-market sales of unrestricted securities which may
      be  effected  immediately if the market is adequate, restricted securities
      can  be  sold only in a public offering for which a registration statement
      is  in  effect  under  the  Securities  Act of 1933, as amended (the "1933
      Act"), or pursuant to a transaction that is exempt from registration under
      the 1933 Act.

      The  value  of  restricted  securities,  and of any other assets for which
      there  are  no reliable market quotations, is the fair value as determined
      in  good  faith  by  the  Trust's Board of Trustees (the "Trustees"). Each
      restricted  security  is  valued  by  the  Trustees  at  the  time  of its
      acquisition   and   at  least  quarterly  thereafter.  The  Trustees  have
      established   guidelines  to  aid  in  the  valuation  of  each  security.
      Generally,  restricted  securities are initially valued at cost or less at
      the time of acquisition by the Trust. Values greater or less than cost are
      used  thereafter  for  restricted securities in appropriate circumstances.
      Among  the factors ordinarily considered are the existence of restrictions
      upon  the  sale  of  a  security  held  by  the  Trust; an estimate of the
      existence  and  the extent of a market for the security; the extent of any
      discount  at which the security was acquired; the estimated period of time
      during  which  the  security  will not be freely marketable; the estimated
      expenses  of  registering  or otherwise qualifying the security for public
      sale; estimated underwriting commissions if underwriting would be required
      to effect a sale; in the case of a convertible security, whether or not it
      would  trade  on  the basis of its stock equivalent; in the case of a debt
      obligation  which  would trade independently of any equity equivalent, the
      current  yields  on  comparable  securities;  the  estimated amount of the
      floating  supply of such securities available for purchase; the proportion
      of  the  issue  held  by the Trust; changes in the financial condition and
      prospects  of  the  issuer;  the  existence  of merger proposals or tender
      offers  affecting  the issuer; and any other factors affecting fair value,
      all in accordance with the Investment Company Act of 1940, as amended (the
      "1940  Act"). In making valuations, opinions of counsel may be relied upon
      as  to  whether  or not securities are restricted securities and as to the
      legal requirements for public sale.

      When  market  quotations are readily available for unrestricted securities
      of an issuer, restricted securities of the same class are generally valued
      at  a  discount from the market price of such unrestricted securities. The
      Trustees,  however, consider all factors in fixing any discount, including
      the  filing of a registration statement for such securities under the 1933
      Act   and  any  other  developments  which  are  likely  to  increase  the
      probability  that the securities may be publicly sold by the Trust without
      restriction.

      The  Trustees  meet at least once each quarter to approve the value of the
      Trust's  portfolio  securities  as  of  the  close of business on the last
      business  day  of  the  preceding  quarter.  This  valuation  requires the
      approval  of a majority of the Trustees of the Trust, including a majority
      of  the  Trustees who are not interested persons of the Trust or of Babson
      Capital.  In  making  valuations,  the  Trustees  will consider reports by
      Babson Capital analyzing
--------------------------------------------------------------------------------
38

                                                  MassMutual Corporate Investors

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

      each  portfolio  security in accordance with the relevant factors referred
      to  above.  Babson Capital has agreed to provide such reports to the Trust
      at least quarterly.

      The consolidated financial statements include private placement restricted
      securities  valued  at  $191,058,029 (84.45% of net assets) as of June 30,
      2010  whose  values  have been estimated by the Trustees in the absence of
      readily  ascertainable  market  values. Due to the inherent uncertainty of
      valuation, those estimated values may differ significantly from the values
      that  would  have been used had a ready market for the securities existed,
      and the differences could be material.

      The  values  for  Rule  144A  restricted  securities  and corporate public
      securities  are stated at the last reported sales price or at prices based
      upon  quotations  obtained  from  brokers and dealers as of June 30, 2010,
      subject to discount where appropriate, and are approved by the Trustees.

      Short-term  securities with more than sixty days to maturity are valued at
      fair  value  and  short-term securities having a maturity of sixty days or
      less are valued at amortized cost, which approximates market value.

      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 June 30, 2010:


      ASSETS:                         TOTAL                 LEVEL 1              LEVEL 2                LEVEL 3
      -------------------------------------------------------------------------------------------------------------
                                                                                          
      Restricted Securities
        Bonds                      $175,587,665            $       --           $14,929,823           $160,657,842
        Common Stock                 14,857,100                    --                    --             14,857,100
        Preferred Stock               8,765,650                    --               111,151              8,654,499
        Partnerships and LLCs         6,888,588                    --                    --              6,888,588
      Public Securities
        Bonds                        37,642,781                    --            37,642,781                     --
        Common Stock                  1,968,020             1,960,670                 7,350                     --
        Preferred Stock                      --                    --                    --                     --
      Short-term Securities           4,249,817                    --             4,249,817                     --
      -------------------------------------------------------------------------------------------------------------
      TOTAL                        $249,959,621            $1,960,670           $56,940,922           $191,058,029


      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           ENDING        IN NET INCOME
                                  BALANCE           (REALIZED/       & SETTLEMENTS   IN AND/OR         BALANCE AT       FROM ASSETS
      ASSETS:                  AT 12/31/2009        UNREALIZED)          (NET)     OUT OF LEVEL 3      06/30/2010       STILL HELD
      ------------------------------------------------------------------------------------------------------------------------------
                                                                                                       
      Restricted Securities
        Bonds                   $152,772,751        $2,190,029         $5,695,062     $    --        $160,657,842        $  410,289
        Common Stock              14,693,318           761,936           (598,154)         --          14,857,100           378,804
        Preferred Stock            6,638,626         1,889,830            126,043          --           8,654,499         1,475,779
        Partnerships and LLCs      6,678,496           169,204             40,888          --           6,888,588           169,204
      Public Securities
        Bonds                             10                (8)                (2)         --                  --                --
      ------------------------------------------------------------------------------------------------------------------------------
                                $180,783,201        $5,010,991         $5,263,837     $    --        $191,058,029        $2,434,076

--------------------------------------------------------------------------------
                                                                              39

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

      B. ACCOUNTING FOR INVESTMENTS:
      Investment  transactions  are  accounted  for  on the trade date. Dividend
      income is recorded on the ex-dividend date. Interest income is recorded on
      the accrual basis, including the amortization of premiums and accretion of
      discounts on bonds held using the yield-to-maturity method. The Trust does
      not  accrue income when payment is delinquent and when management believes
      payment is questionable.

      Realized  gains  and  losses  on  investment  transactions  and unrealized
      appreciation  and  depreciation  of investments are reported for financial
      statement and Federal income tax purposes on the identified cost method.

      C. USE OF ESTIMATES:
      The  preparation  of  financial  statements  in conformity with accounting
      principles  generally  accepted  in  the United States of America requires
      management  to  make  estimates  and  assumptions that affect the reported
      amounts  of assets and liabilities and disclosure of contingent assets and
      liabilities  at  the  date  of  the  financial statements and the reported
      amounts  of  revenues  and  expenses  during  the reporting period. Actual
      results could differ from those estimates.

      D. FEDERAL INCOME TAXES:
      The  Trust  has  elected  to  be taxed as a "regulated investment company"
      under   the   Internal   Revenue   Code,  and  intends  to  maintain  this
      qualification  and  to  distribute  substantially  all  of its net taxable
      income  to  its shareholders. In any year when net long-term capital gains
      are  realized  by  the  Trust, management, after evaluating the prevailing
      economic conditions, will recommend that the Trustees either designate the
      net  realized long-term gains as undistributed and pay the Federal capital
      gains taxes thereon or distribute all or a portion of such net gains.

      The  Trust  is  taxed  as  a regulated investment company and is therefore
      limited  as  to  the amount of non-qualified income that it may receive as
      the  result  of  operating  a trade or business, e.g. the Trust's pro rata
      share of income allocable to the Trust by a partnership operating company.
      The  Trust's  violation of this limitation could result in the loss of its
      status  as  a  regulated investment company, thereby subjecting all of its
      net  income  and capital gains to corporate taxes prior to distribution to
      its  shareholders.  The  Trust,  from  time-to-time, identifies investment
      opportunities in the securities of entities that could cause such trade or
      business  income  to  be allocable to the Trust. The MMCI Subsidiary Trust
      (described in Footnote 1 above) was formed in order to allow investment in
      such  securities  without  adversely  affecting  the  Trust's  status as a
      regulated investment company.

      The  MMCI Subsidiary Trust is not taxed as a regulated investment company.
      Accordingly,  prior to the Trust receiving any distributions from the MMCI
      Subsidiary  Trust,  all  of the MMCI Subsidiary Trust's taxable income and
      realized  gains,  including  non-qualified  income  and realized gains, is
      subject  to taxation at prevailing corporate tax rates. For the six months
      ended  June  30,  2010,  the  MMCI Subsidiary Trust has accrued income tax
      expense of $1,308.

      Deferred  tax  assets  and  liabilities  are recognized for the future tax
      consequences  attributable  to differences between the financial statement
      carrying  amounts  of  the  existing  assets  and  liabilities  and  their
      respective tax basis. As of June 30, 2010, the MMCI subsidiary Trust has a
      deferred tax liability of $145,855.

      Beginning  with the 2009 annual financial statements, the Trust recognizes
      a  tax  benefit  from an uncertain position only if it is more likely than
      not that the position is sustainable, based solely on its technical merits
      and  consideration  of  the  relevant taxing authority's widely understood
      administrative  practices  and  precedents.  If this threshold is met, the
      Trust  measures  the  tax benefit as the largest amount of benefit that is
      greater  than  fifty  percent  likely  of  being  realized  upon  ultimate
      settlement.  The Trust has evaluated and determined that the tax positions
      did  not  have  a  material  effect  on the Trust's financial position and
      results of operations for the six months ended June 30, 2010.

      E. DISTRIBUTIONS TO SHAREHOLDERS:
      The Trust records distributions to shareholders from net investment income
      and  net  realized  gains, if any, on the exdividend date. The Trust's net
      investment  income  dividend  is  declared  four times per year, in April,
      July,  October,  and  December.  The  Trust's  net  realized  capital gain
      distribution, if any, is declared in December.

      F. EXPENSE REDUCTION:
      Citibank,  N.A. ("Citibank") serves as custodian to the Trust. Pursuant to
      the  custodian  agreement,  Citibank  receives a fee reduced by credits on
      cash  balances  the Trust maintains with Citibank. All credit balances, if
      any,  used  to reduce the Trust's custodian fees are reported as fees paid
      indirectly  on  the Statement of Operations. For the six months ended June
      30, 2010, there were no credit balances used to reduce custodian fees.

3.    INVESTMENT SERVICES CONTRACT
      A. SERVICES:
      Under  an  Investment  Services  Contract (the "Contract") with the Trust,
      Babson  Capital  agrees  to use its best efforts to present to the Trust a
      continuing  and suitable investment program consistent with the investment
      objectives  and policies of the Trust. Babson Capital represents the Trust
      in  any  negotiations  with  issuers, investment banking firms, securities
      brokers  or  dealers  and  other institutions or investors relating to the
      Trust's  investments.  Under  the  Contract,  Babson Capital also provides
      administration  of the day-to-day operations of the Trust and provides the
      Trust  with  office space and office equipment, accounting and bookkeeping
      services,  and necessary executive, clerical and secretarial personnel for
      the performance of the foregoing services.
--------------------------------------------------------------------------------
40

                                                  MassMutual Corporate Investors

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

      B. FEE:
      For  its  services  under the Contract, Babson Capital is paid a quarterly
      investment  advisory fee of 0.3125% of the net asset value of the Trust as
      of  the  last  business day of each fiscal quarter, which is approximately
      equal  to 1.25% annually. A majority of the Trustees, including a majority
      of  the  Trustees who are not interested persons of the Trust or of Babson
      Capital, approve the valuation of the Trust's net assets as of such day.

      C. BASIS FOR BOARD RENEWAL OF CONTRACT::
      At a meeting of the Board of Trustees held on April 16, 2010, the Trustees
      (including  a majority of the Trustees who are not "interested persons" of
      the  Trust  or Babson Capital) unanimously approved a one year continuance
      of the Contract.

      Prior  to  the  meeting,  the Trustees requested and received from Ropes &
      Gray  LLP,  counsel  to  the  Trust, a memorandum describing the Trustees'
      legal responsibilities in connection with its review and reapproval of the
      Contract.  The  Trustees  also  requested and received from Babson Capital
      extensive  written and oral information regarding among other matters: the
      principal  terms  of  the  Contract;  the  reasons  why Babson Capital was
      proposing  the  continuance  of  the  Contract;  Babson  Capital  and  its
      personnel;  the  Trust's  investment  performance,  including  comparative
      performance  information;  the nature and quality of the services provided
      by  Babson Capital to the Trust; financial strength of Babson Capital; the
      fee  arrangements  between  Babson  Capital and the Trust; fee and expense
      information,   including   comparative   fee   and   expense  information;
      profitability of the advisory arrangement to Babson Capital; and "fallout"
      benefits to Babson Capital resulting from the Contract.

      Among  other things, the Trustees discussed and considered with management
      (i)  the  aforementioned  guidance  provided  by  Ropes & Gray LLP and the
      information  provided by Babson Capital prior to the meeting, and (ii) the
      reasons Babson Capital put forth in support of its recommendation that the
      Trustees approve the continuance of the Contract. These considerations are
      summarized below.

      NATURE, EXTENT AND QUALITY OF SERVICES TO BE PROVIDED BY BABSON CAPITAL TO
      THE TRUST

      In  evaluating  the  scope  and quality of the services provided by Babson
      Capital,  the  Trustees  considered, among other factors: (i) the scope of
      services  required  to  be  provided by Babson Capital under the Contract;
      (ii)  Babson  Capital's  ability  to  find and negotiate private placement
      securities  having  equity  features  that  are consistent with the stated
      investment  objectives  of  the Trust; (iii) the experience and quality of
      Babson  Capital's  staff;  (iv) the strength of Babson Capital's financial
      condition;  (v)  the  nature  of  the private placement market compared to
      public  markets  (including  the fact that finding, analyzing, negotiating
      and  servicing  private  placement securities is more labor-intensive than
      buying  and  selling  public  securities and the administration of private
      placement  securities  is  more extensive, expensive, and requires greater
      time  and  expertise than a portfolio of only public securities); (vi) the
      potential  advantages afforded to the Trust by its ability to co-invest in
      negotiated  private  placements  with  MassMutual  and its affiliates; and
      (vii) the expansion of the scope of services provided by Babson Capital as
      a  result  of  recent  regulatory  and  legislative  initiatives that have
      required increased legal, compliance and business attention and diligence.
      Based  on  such considerations, the Trustees concluded that, overall, they
      are  satisfied with the nature, extent and quality of services provided by
      Babson  Capital,  and  expected  to  be  provided in the future, under the
      renewed Contract.

      INVESTMENT PERFORMANCE

      The  Trustees also examined the Trust's short-term, intermediate-term, and
      long-term  performance  as  compared  against  various  benchmark  indices
      presented  at  the  meeting,  which showed that the Trust had outperformed
      such  indices  for  the  1-, 3-, 5-, and 10-year periods. In addition, the
      Trustees  considered  comparisons  of  the  Trust's  performance  with the
      performance of (i) selected closed-end investment companies and funds that
      may  invest  in  private  placement  securities  and/or  bank  loans; (ii)
      selected   business   development   companies  with  comparable  types  of
      investments;  and  (iii)  investment  companies  included  in  the  Lipper
      closed-end bond universe. It was acknowledged that, while such comparisons
      are  helpful  in  judging performance, they are not directly comparable in
      terms  of  types  of investments due to the fact that business development
      companies often report returns based on market value, which is affected by
      factors   other   than   the   performance  of  the  underlying  portfolio
      investments.  Based  on  these considerations and the detailed performance
      information  provided  to  the Trustees at the regular Board meetings each
      quarter,  the  Trustees  concluded  that the Trust's absolute and relative
      performance  over  time  have  been  sufficient  to warrant renewal of the
      Contract.

      ADVISORY   FEE/COST   OF  SERVICES  PROVIDED  AND  PROFITABILITY/MANAGER'S
      "FALL-OUT" BENEFITS

      In connection with the Trustees' consideration of the advisory fee paid by
      the  Trust to Babson Capital under the Contract, Babson Capital noted that
      it  was unaware of any registered closed-end investment companies that are
      directly  comparable to the Trust in terms of the types of investments and
      percentages  invested  in private placement securities (which require more
      extensive  advisory  and  administrative  services  than  a  portfolio  of
      publicly traded securities, as previously discussed) other than MassMutual
      Participation  Investors,  which  also is advised by Babson Capital. Under
      the terms of its Investment Advisory and Administrative Services Contract,
      MassMutual  Participation  Investors  is  charged  a  quarterly investment
      advisory  fee  of 0.225% of net asset value as of the end of each quarter,
      which  is  approximately  equal  to 0.90% annually. In considering the fee
      rate  provided  in  the
--------------------------------------------------------------------------------
                                                                              41

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)

      Contract, the Trustees noted the advisory fee charged by Babson Capital to
      Tower  Square  Capital  Partners,  L.P., Tower Square Capital Partners II,
      L.P.,  and  Tower  Square  Capital  Partners  III,  L.P.,  each  a private
      mezzanine  debt  fund also managed by Babson Capital, and that the fee the
      Trust charged compares favorably.

      At  the  request  of  the  Trustees,  Babson  Capital provided information
      concerning  the  profitability  of  Babson Capital's advisory relationship
      with  the  Trust.  The  Trustees also considered the non-economic benefits
      Babson  Capital  and its affiliates derived from its relationship with the
      Trust,  including  the reputational benefits derived from having the Trust
      listed  on  the  New  York  Stock  Exchange,  and the de minimis amount of
      commissions  resulting  from  the  Trust's  portfolio transactions used by
      Babson  Capital  for  third-party  soft  dollar arrangements. The Trustees
      recognized  that  Babson  Capital  should be entitled to earn a reasonable
      level  of  profit  for  services provided to the Trust and, based on their
      review,   concluded   that  they  were  satisfied  that  Babson  Capital's
      historical level of profitability from its relationship with the Trust was
      not  excessive  and  that the advisory fee structure under the Contract is
      reasonable.

      ECONOMIES OF SCALE

      Finally,  the  Trustees  considered  the concept of economies of scale and
      possible  advisory  fee  reductions  if  the Trust were to grow in assets.
      Given  that  the  Trust  is  not continuously offering shares, such growth
      comes  principally  from  retained  net  realized  gain on investments and
      dividend  reinvestment. The Trustees also examined the breakpoint features
      of  selected  competitive  funds and noted that the minimum starting point
      for  fee  reductions  in those funds was at least $200 million, around the
      value  of  the Trust's current net assets. The Trustees concluded that the
      absence  of  breakpoints  in  the  fee  schedule  under  the  Contract was
      currently  acceptable  given  the Trust's current size and closed-end fund
      structure.

4.    SENIOR SECURED INDEBTEDNESS
      MassMutual  holds  the  Trust's  $30,000,000 Senior Fixed Rate Convertible
      Note  (the  "Note")  issued by the Trust on November 15, 2007. The Note is
      due November 15, 2017 and accrues interest at 5.28% per annum. MassMutual,
      at  its  option,  can convert the principal amount of the Note into common
      shares.  The  dollar  amount  of  principal  would  be  converted  into an
      equivalent  dollar amount of common shares based upon the average price of
      the common shares for ten business days prior to the notice of conversion.
      For  the six months ended June 30, 2010, the Trust incurred total interest
      expense on the Note of $792,000.

      The  Trust  may  redeem  the  Note,  in whole or in part, at the principal
      amount  proposed  to  be  redeemed  together  with  the accrued and unpaid
      interest  thereon  through  the redemption date plus a Make Whole Premium.
      The  Make  Whole Premium equals the excess of (i) the present value of the
      scheduled  payments  of  principal and interest which the Trust would have
      paid  but  for the proposed redemption, discounted at the rate of interest
      of  U.S. Treasury obligations whose maturity approximates that of the Note
      plus 0.50% over (ii) the principal of the Note proposed to be redeemed.

5.    PURCHASES AND SALES OF INVESTMENTS
                                                     FOR THE SIX
                                                     MONTHS ENDED
                                                      06/30/2010
                                                      ----------
                                               COST                PROCEEDS
                                                OF                   FROM
                                            INVESTMENTS            SALES OR
                                              ACQUIRED            MATURITIES
                                            -----------          -----------
      Corporate restricted securities       $23,555,310          $15,706,359
      Corporate public securities            12,815,071           11,708,219

      The  aggregate cost of investments is substantially the same for financial
      reporting  and  Federal  income  tax purposes as of June 30, 2010. The net
      unrealized depreciation of investments for financial reporting and Federal
      tax  purposes  as  of  June  30,  2010  is  $32,656,522  and  consists  of
      $19,920,680 appreciation and $52,577,202 depreciation.

      Net  unrealized depreciation of investments on the Statement of Assets and
      Liabilities reflects the balance net of a deferred tax accrual of $145,855
      on net unrealized gains on the MMCI Subsidiary Trust.

6.    QUARTERLY RESULTS OF INVESTMENT OPERATIONS

                                                     MARCH 31, 2010
                                                AMOUNT          PER SHARE
                                              ----------        ---------
      Investment income                       $6,096,825
      Net investment income                    4,871,657          $0.52
      Net realized and unrealized
        gain on investments (net of taxes)       850,850           0.09

                                                     JUNE 30, 2010
                                                AMOUNT          PER SHARE
                                              ----------        ---------
      Investment income                       $6,319,951
      Net investment income                    5,070,723          $0.54
      Net realized and unrealized
        gain on investments (net of taxes)     4,922,366           0.52

--------------------------------------------------------------------------------
42

                                                  MassMutual Corporate Investors

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
(UNAUDITED)


      7. RESULTS OF SHAREHOLDER MEETING
      The Annual Meeting of Shareholders was held on Friday, April 16, 2010. The
      Shareholders  were asked to vote to re-elect as trustees Donald E. Benson,
      Donald   Glickman,   and  Robert  E.  Joyal  for  three  year  terms.  The
      Shareholders  approved  the proposals. The Trust's other Trustees, William
      J. Barrett, Michael H. Brown, Martin T. Hart, Corine T. Norgaard, Clifford
      M.  Noreen,  and  Maleyne  M. Syracuse continued to serve their respective
      terms  following  the  April  16,  2010  Annual  Shareholders Meeting. The
      results of the Shareholder voting are set forth below.

                                                               % OF SHARES
      SHARES FOR              WITHHELD           TOTAL          VOTED FOR
      Donald E. Benson
      7,556,960               108,989          7,665,949            98.58%
      Donald Glickman
      7,550,332               115,617          7,665,949            98.49%
      Robert E. Joyal
      7,575,476                90,473          7,665,949            98.82%

8.    BY-LAWS AMENDMENT
      On  April  16,  2010,  the  Board of Trustees approved an amendment to the
      By-Laws  of  the  Trust  to include an advance notice provision that would
      require  shareholders  seeking  to  nominate  Trustee  candidates or bring
      business  before  an annual meeting to provide timely notice to the Trust,
      consistent  with certain specified requirements, of their intent to do so.










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                                                                              43

















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                                                  MassMutual Corporate Investors

MEMBERS OF THE BOARD
OF TRUSTEES

Donald Glickman

Robert E. Joyal

William J. Barrett

Michael H. Brown*

Donald E. Benson*

Dr. Corine T. Norgaard*

Clifford M. Noreen

Martin T. Hart

Maleyne M. Syracuse

*Member of the Audit committee



OFFICERS

Clifford M. Noreen
Chairman

Michael L. Klofas
President

James M. Roy
Vice President & Chief
Financial Officer

Patricia J. Walsh
Vice President, Secretary
& Chief Legal Officer

Jill A. Fields
Vice President

Michael P. Hermsen
Vice President

Mary Wilson Kibbe
Vice President

Richard E. Spencer, II
Vice President

Daniel J. Florence
Treasurer

John T. Davitt, Jr.
Comptroller

Melissa M. LaGrant
Chief Compliance Officer



DIVIDEND REINVESTMENT AND CASH PURCHASE PLAN

MassMutual Corporate Investors offers a Dividend Reinvestment and Share Purchase
Plan  (the  "Plan").  The  Plan provides a simple way for shareholders to add to
their holdings in the Trust through the receipt of dividend shares issued by the
Trust  or  through the investment of cash dividends in Trust shares purchased in
the  open  market. A shareholder may join the Plan by filling out and mailing an
authorization card to Shareholder Financial Services, Inc., the Transfer Agent.

Participating  shareholders  will  continue to participate until they notify the
Transfer Agent, in writing, of their desire to terminate participation. Unless a
shareholder  elects  to participate in the Plan, he or she will, in effect, have
elected to receive dividends and distributions in cash.

Participating  shareholders  may  also make additional contributions to the Plan
from  their own funds. Such contributions may be made by personal check or other
means  in  an  amount  not  less than $10 nor more than $5,000 per quarter. Cash
contributions  must be received by the Transfer Agent at least five days (but no
more then 30 days) before the payment date of a dividend or distributions.

Whenever  the  Trust declares a dividend payable in cash or shares, the Transfer
Agent,  acting  on  behalf  of  each  participating  shareholder,  will take the
dividend  in  shares  only if the net asset value is lower than the market price
plus  an  estimated  brokerage  commission  as  of  the close of business on the
valuation  day.  The valuation day is the last day preceding the day of dividend
payment.

When  the dividend is to be taken in shares, the number of shares to be received
is  determined  by  dividing  the cash dividend by the net asset value as of the
close of business on the valuation date or, if greater than net asset value, 95%
of  the closing share price. If the net asset value of the shares is higher than
the  market  value  plus an estimated commission, the Transfer Agent, consistent
with  obtaining the best price and execution, will buy shares on the open market
at current prices promptly after the dividend payment date.

The  reinvestment  of  dividends  does  not,  in  anyway,  relieve participating
shareholders  of  any  Federal,  state  or  local  tax.  For  Federal income tax
purposes,   the   amount  reportable  in  respect  of  a  dividend  received  in
newly-issued  shares  of  the  Trust will be the fair market value of the shares
received, which will be reportable as ordinary income and/or capital gains.

As compensation for its services, the Transfer Agent receives a fee of 5% of any
dividend  and cash contribution (in no event in excess of $2.50 per distribution
per shareholder.)

Any  questions  regarding  the Plan should be addressed to Shareholder Financial
Services,  Inc.,  Transfer  Agent  for  MassMutual Corporate Investors' Dividend
Reinvestment and Share Purchase Plan, P.O. Box 173673, Denver, CO 80217-3673.






MASSMUTUAL
CORPORATE INVESTORS














CI5233

ITEM 2.  CODE OF ETHICS.

         Not applicable to this filing.

ITEM 3.  AUDIT COMMITTEE FINANCIAL EXPERT.

         Not applicable to this filing.

ITEM 4.  PRINCIPAL ACCOUNTANT FEES AND SERVICES.

         Not applicable to this filing.

ITEM 5.  AUDIT COMMITTEE OF LISTED REGISTRANTS.

         Not applicable to this filing.

ITEM 6.  SCHEDULE OF INVESTMENTS

         A schedule of investments for the Registrant is included as part of
         this report to shareholders under Item 1 of this Form N-CSR.

ITEM 7.  DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
         MANAGEMENT INVESTMENT COMPANIES.

         Not applicable to this filing.

ITEM 8.  PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

         Not applicable to this filing. There have been no changes in any of the
         Portfolio Managers identified in the Registrant's most recent annual
         report on Form N-CSR.

ITEM 9.  PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT
         COMPANY AND AFFILIATED PURCHASERS.

         Not applicable for this filing.

ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

         Not applicable for this filing.

ITEM 11. CONTROLS AND PROCEDURES.

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

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

ITEM 12. EXHIBITS.

        (a)(1) ANY CODE OF ETHICS, OR AMENDMENTS THERETO, THAT IS THE SUBJECT OF
               DISCLOSURE REQUIRED BY ITEM 2, TO THE EXTENT THAT THE REGISTRANT
               INTENDS TO SATISFY THE ITEM 2 REQUIREMENTS THROUGH THE FILING OF
               AN EXHIBIT.

               None.

        (a)(2) A SEPARATE CERTIFICATION FOR EACH PRINCIPAL EXECUTIVE OFFICER AND
               PRINCIPAL FINANCIAL OFFICER OF THE REGISTRANT AS REQUIRED BY RULE
               30a-2 UNDER THE ACT.

               Attached hereto as EX-99.31.1
               Attached hereto as EX-99.31.2

        (a)(3) ANY WRITTEN SOLICITATION TO PURCHASE SECURITIES UNDER RULE 23c-1
               UNDER THE ACT (17 CFR 270.23c-1) SENT OR GIVEN DURING THE PERIOD
               COVERED BY THE REPORT BY OR ON BEHALF OF THE REGISTRANT TO 10 OR
               MORE PERSONS.

               Not applicable for this filing.

        (b)    CERTIFICATIONS PURSUANT TO RULE 30a-2(b) UNDER THE ACT.

               Attached hereto as EX-99.32


                                   SIGNATURES

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

(Registrant):   MassMutual Corporate Investors
                ----------------------------------
By:             /s/ Michael L. Klofas
                ----------------------------------
                Michael L. Klofas, President
                ----------------------------------
Date:           September 8, 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:             /s/ Michael L. Klofas
                ----------------------------------
                Michael L. Klofas, President
                ----------------------------------
Date:           September 8, 2010
                ----------------------------------
By:             /s/ James M. Roy
                ----------------------------------
                James M. Roy, Vice President and
                Chief Financial Officer
                ----------------------------------
Date:           September 8, 2010
                ------------------------------