<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MASSMUTUAL CORPORATE INVESTORS FOR THE PERIOD
ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000275694
<NAME> MASSMUTUAL CORPORATE INVESTORS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<INVESTMENTS-AT-COST> 241,157,729
<INVESTMENTS-AT-VALUE> 226,820,497
<RECEIVABLES> 6,245,725
<ASSETS-OTHER> 2,004,861
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 235,071,083
<PAYABLE-FOR-SECURITIES> 746,365
<SENIOR-LONG-TERM-DEBT> 20,000,000
<OTHER-ITEMS-LIABILITIES> 2,930,621
<TOTAL-LIABILITIES> 23,676,986
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 104,651,714
<SHARES-COMMON-STOCK> 8,587,495
<SHARES-COMMON-PRIOR> 8,587,495
<ACCUMULATED-NII-CURRENT> 5,434,721
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 115,644,894
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (14,337,232)
<NET-ASSETS> 211,394,097
<DIVIDEND-INCOME> 253,946
<INTEREST-INCOME> 10,070,230
<OTHER-INCOME> 0
<EXPENSES-NET> 2,048,309
<NET-INVESTMENT-INCOME> 8,275,867
<REALIZED-GAINS-CURRENT> 17,088,794
<APPREC-INCREASE-CURRENT> 933,049
<NET-CHANGE-FROM-OPS> 26,297,710
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 3,864,373
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 22,433,337
<ACCUMULATED-NII-PRIOR> 4,913,568
<ACCUMULATED-GAINS-PRIOR> 98,556,100
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,308,340
<INTEREST-EXPENSE> 533,000
<GROSS-EXPENSE> 2,048,309
<AVERAGE-NET-ASSETS> 199,089,868
<PER-SHARE-NAV-BEGIN> 20.00
<PER-SHARE-NII> 0.96
<PER-SHARE-GAIN-APPREC> 2.11
<PER-SHARE-DIVIDEND> 0.45
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 24.62
<EXPENSE-RATIO> 1.03
</TABLE>
