<PAGE> PAGE 1
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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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014 A000204 MML DISTRIBUTORS LLC
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014 A000205 BABSON SECURITIES, CORP.
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
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<PAGE> PAGE 18
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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<PAGE> PAGE 21
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<PAGE> PAGE 22
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<PAGE> PAGE 23
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<PAGE> PAGE 24
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<PAGE> PAGE 25
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 33
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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<PAGE> PAGE 42
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<PAGE> PAGE 43
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<PAGE> PAGE 44
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014 A000905 BABSON SECURITIES CORP.
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<PAGE> PAGE 45
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<PAGE> PAGE 46
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<PAGE> PAGE 47
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<PAGE> PAGE 48
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<PAGE> PAGE 49
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008 A001001 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
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014 B001001 8-27250
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<PAGE> PAGE 50
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<PAGE> PAGE 51
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<PAGE> PAGE 52
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<PAGE> PAGE 53
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<PAGE> PAGE 54
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<PAGE> PAGE 55
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<PAGE> PAGE 56
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<PAGE> PAGE 57
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072EE001100 1131
073 A011100 0.0000
073 A021100 0.0000
073 B001100 0.0000
073 C001100 0.0000
074 A001100 12589
074 B001100 9656
074 C001100 13279
<PAGE> PAGE 58
074 D001100 0
074 E001100 0
074 F001100 87013
074 G001100 0
074 H001100 0
074 I001100 0
074 J001100 70
074 K001100 0
074 L001100 745
074 M001100 0
074 N001100 123352
074 O001100 821
074 P001100 75
074 Q001100 0
074 R011100 0
074 R021100 0
074 R031100 0
074 R041100 13593
074 S001100 0
074 T001100 108863
074 U011100 5799
074 U021100 1045
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074 V021100 0.00
074 W001100 0.0000
074 X001100 15
074 Y001100 0
075 A001100 0
075 B001100 45010
076 001100 0.00
008 A001201 MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
008 B001201 A
008 C001201 801-8059
008 D011201 SPRINGFIELD
008 D021201 MA
008 D031201 01111
008 D041201 0001
014 A001201 MML INVESTORS SERVICES, INC.
014 B001201 8-27250
014 A001202 OPPENHEIMERFUNDS DISTRIBUTOR, INC.
014 B001202 8-22992
014 A001203 CENTENNIAL ASSET MANAGEMENT CORPORATION
014 B001203 8-22948
014 A001204 MML DISTRIBUTORS LLC
014 B001204 8-48203
014 A001205 BABSON SECURITIES, CORP.
014 B001205 8-47589
014 A001206 ADVEST, INC.
014 B001206 8-0000
014 A001207 JEFFERIES & CO., INC.
014 B001207 8-0000
<PAGE> PAGE 59
015 A001201 INVESTORS BANK & TRUST COMPANY
015 B001201 C
015 C011201 BOSTON
015 C021201 MA
015 C031201 02116
015 E011201 X
024 001200 N
025 D001201 0
025 D001202 0
025 D001203 0
025 D001204 0
025 D001205 0
025 D001206 0
025 D001207 0
025 D001208 0
028 A011200 0
028 A021200 0
028 A031200 0
028 A041200 0
028 B011200 334
028 B021200 0
028 B031200 0
028 B041200 0
028 C011200 0
028 C021200 0
028 C031200 0
028 C041200 0
028 D011200 39
028 D021200 0
028 D031200 0
028 D041200 0
028 E011200 2
028 E021200 0
028 E031200 0
028 E041200 0
028 F011200 5
028 F021200 1055
028 F031200 0
028 F041200 0
028 G011200 380
028 G021200 1055
028 G031200 0
028 G041200 0
028 H001200 0
045 001200 Y
046 001200 N
047 001200 Y
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048 B011200 0
<PAGE> PAGE 60
048 B021200 0.000
048 C011200 0
048 C021200 0.000
048 D011200 0
048 D021200 0.000
048 E011200 0
048 E021200 0.000
048 F011200 0
048 F021200 0.000
048 G011200 0
048 G021200 0.000
048 H011200 0
048 H021200 0.000
048 I011200 0
048 I021200 0.000
048 J011200 0
048 J021200 0.000
048 K011200 0
048 K021200 0.000
055 A001200 N
055 B001200 N
056 001200 Y
057 001200 N
062 A001200 Y
062 B001200 0.0
062 C001200 0.0
062 D001200 0.0
062 E001200 0.0
062 F001200 0.0
062 G001200 0.0
062 H001200 0.0
062 I001200 10.7
062 J001200 0.0
062 K001200 0.0
062 L001200 0.0
062 M001200 25.0
062 N001200 36.0
062 O001200 0.0
062 P001200 27.3
062 Q001200 0.0
062 R001200 0.0
063 A001200 0
063 B001200 14.2
066 A001200 N
067 001200 N
068 A001200 N
068 B001200 N
069 001200 N
070 A011200 Y
070 A021200 N
070 B011200 Y
<PAGE> PAGE 61
070 B021200 N
070 C011200 Y
070 C021200 N
070 D011200 Y
070 D021200 N
070 E011200 Y
070 E021200 N
070 F011200 Y
070 F021200 N
070 G011200 Y
070 G021200 N
070 H011200 Y
070 H021200 N
070 I011200 N
070 I021200 N
070 J011200 Y
070 J021200 Y
070 K011200 Y
070 K021200 N
070 L011200 Y
070 L021200 Y
070 M011200 Y
070 M021200 N
070 N011200 Y
070 N021200 N
070 O011200 Y
070 O021200 N
070 P011200 Y
070 P021200 N
070 Q011200 N
070 Q021200 N
070 R011200 Y
070 R021200 N
071 A001200 30685
071 B001200 7210
071 C001200 22679
071 D001200 32
072 A001200 8
072 B001200 1176
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072 D001200 0
072 E001200 0
072 F001200 83
072 G001200 21
072 H001200 0
072 I001200 0
072 J001200 6
072 K001200 0
072 L001200 0
072 M001200 10
072 N001200 0
<PAGE> PAGE 62
072 O001200 0
072 P001200 0
072 Q001200 0
072 R001200 4
072 S001200 0
072 T001200 0
072 U001200 0
072 V001200 0
072 W001200 0
072 X001200 124
072 Y001200 0
072 Z001200 1052
072AA001200 0
072BB001200 116
072CC011200 0
072CC021200 998
072DD011200 1041
072DD021200 14
072EE001200 0
073 A011200 0.0000
073 A021200 0.0000
073 B001200 0.0000
073 C001200 0.0000
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074 B001200 0
074 C001200 2695
074 D001200 22364
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074 F001200 0
074 G001200 0
074 H001200 0
074 I001200 0
074 J001200 0
074 K001200 0
074 L001200 275
074 M001200 0
074 N001200 25345
074 O001200 0
074 P001200 14
074 Q001200 0
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074 R021200 0
074 R031200 0
074 R041200 9
074 S001200 0
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074 U021200 36
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074 V021200 0.00
074 W001200 0.0000
<PAGE> PAGE 63
074 X001200 8
074 Y001200 0
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076 001200 0.00
SIGNATURE STEPHEN KUHN
TITLE VICE PRESIDENT
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 011
<NAME> Prime Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 355,750,791
<INVESTMENTS-AT-VALUE> 355,727,916
<RECEIVABLES> 12,755,156
<ASSETS-OTHER> 4,612
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 368,487,684
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,900,297
<TOTAL-LIABILITIES> 4,900,297
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 363,595,914
<SHARES-COMMON-STOCK> 23,431
<SHARES-COMMON-PRIOR> 794
<ACCUMULATED-NII-CURRENT> 56,324
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (41,976)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,875)
<NET-ASSETS> 3,547,638
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 8,985
<OTHER-INCOME> 0
<EXPENSES-NET> 1,571
<NET-INVESTMENT-INCOME> 7,414
<REALIZED-GAINS-CURRENT> (9)
<APPREC-INCREASE-CURRENT> 32
<NET-CHANGE-FROM-OPS> 7,437
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 30,930
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 73,374
<NUMBER-OF-SHARES-REDEEMED> 50,941
<SHARES-REINVESTED> 204
<NET-CHANGE-IN-ASSETS> 3,427,940
<ACCUMULATED-NII-PRIOR> 19,112
<ACCUMULATED-GAINS-PRIOR> (20,684)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,050,848
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,345,324
<AVERAGE-NET-ASSETS> 151,636
<PER-SHARE-NAV-BEGIN> 150.83
<PER-SHARE-NII> 7.55
<PER-SHARE-GAIN-APPREC> (0.75)
<PER-SHARE-DIVIDEND> (6.22)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 151.41
<EXPENSE-RATIO> 1.04
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 012
<NAME> Prime Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 355,750,791
<INVESTMENTS-AT-VALUE> 355,727,916
<RECEIVABLES> 12,755,156
<ASSETS-OTHER> 4,612
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 368,487,684
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,900,297
<TOTAL-LIABILITIES> 4,900,297
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 363,595,914
<SHARES-COMMON-STOCK> 64,821
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 56,324
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (41,976)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,875)
<NET-ASSETS> 9,842,288
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 18,962
<OTHER-INCOME> 0
<EXPENSES-NET> 2,091
<NET-INVESTMENT-INCOME> 16,871
<REALIZED-GAINS-CURRENT> (8)
<APPREC-INCREASE-CURRENT> (251)
<NET-CHANGE-FROM-OPS> 16,612
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 52,197
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 229,479
<NUMBER-OF-SHARES-REDEEMED> 165,002
<SHARES-REINVESTED> 344
<NET-CHANGE-IN-ASSETS> 9,842,288
<ACCUMULATED-NII-PRIOR> 19,112
<ACCUMULATED-GAINS-PRIOR> (20,684)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,050,848
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,345,324
<AVERAGE-NET-ASSETS> 415,004
<PER-SHARE-NAV-BEGIN> 152.99
<PER-SHARE-NII> 6.37
<PER-SHARE-GAIN-APPREC> (1.24)
<PER-SHARE-DIVIDEND> (6.28)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 151.84
<EXPENSE-RATIO> 0.76
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 013
<NAME> Prime Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 355,750,791
<INVESTMENTS-AT-VALUE> 355,727,916
<RECEIVABLES> 12,755,156
<ASSETS-OTHER> 4,612
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 368,487,684
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,900,297
<TOTAL-LIABILITIES> 4,900,297
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 363,595,914
<SHARES-COMMON-STOCK> 219,727
<SHARES-COMMON-PRIOR> 3,689
<ACCUMULATED-NII-CURRENT> 56,324
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (41,976)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,875)
<NET-ASSETS> 33,392,137
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 478,570
<OTHER-INCOME> 0
<EXPENSES-NET> 44,354
<NET-INVESTMENT-INCOME> 434,216
<REALIZED-GAINS-CURRENT> (312)
<APPREC-INCREASE-CURRENT> (4,212)
<NET-CHANGE-FROM-OPS> 429,692
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,354,719
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,209,819
<NUMBER-OF-SHARES-REDEEMED> 1,002,697
<SHARES-REINVESTED> 8,916
<NET-CHANGE-IN-ASSETS> 32,836,057
<ACCUMULATED-NII-PRIOR> 19,112
<ACCUMULATED-GAINS-PRIOR> (20,684)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,050,848
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,345,324
<AVERAGE-NET-ASSETS> 7,749,343
<PER-SHARE-NAV-BEGIN> 150.73
<PER-SHARE-NII> 8.78
<PER-SHARE-GAIN-APPREC> (1.20)
<PER-SHARE-DIVIDEND> (6.34)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 151.97
<EXPENSE-RATIO> 0.57
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 014
<NAME> Prime Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 355,750,791
<INVESTMENTS-AT-VALUE> 355,727,916
<RECEIVABLES> 12,755,156
<ASSETS-OTHER> 4,612
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 368,487,684
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,900,297
<TOTAL-LIABILITIES> 4,900,297
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 363,595,914
<SHARES-COMMON-STOCK> 2,082,323
<SHARES-COMMON-PRIOR> 1,670,110
<ACCUMULATED-NII-CURRENT> 56,324
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (41,976)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,875)
<NET-ASSETS> 316,805,324
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 14,942,040
<OTHER-INCOME> 0
<EXPENSES-NET> 1,297,308
<NET-INVESTMENT-INCOME> 13,644,732
<REALIZED-GAINS-CURRENT> (20,963)
<APPREC-INCREASE-CURRENT> (59,345)
<NET-CHANGE-FROM-OPS> 13,564,424
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 12,628,175
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,949,101
<NUMBER-OF-SHARES-REDEEMED> 6,619,900
<SHARES-REINVESTED> 83,012
<NET-CHANGE-IN-ASSETS> 65,048,609
<ACCUMULATED-NII-PRIOR> 19,112
<ACCUMULATED-GAINS-PRIOR> (20,684)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,050,848
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,345,324
<AVERAGE-NET-ASSETS> 269,651,045
<PER-SHARE-NAV-BEGIN> 150.74
<PER-SHARE-NII> 7.82
<PER-SHARE-GAIN-APPREC> (0.13)
<PER-SHARE-DIVIDEND> (6.29)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 152.14
<EXPENSE-RATIO> 0.48
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 021
<NAME> Short Term Bond Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 216,044,602
<INVESTMENTS-AT-VALUE> 212,962,650
<RECEIVABLES> 2,627,688
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 1,473
<TOTAL-ASSETS> 215,591,811
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 988,371
<TOTAL-LIABILITIES> 988,371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217,740,767
<SHARES-COMMON-STOCK> 134,435
<SHARES-COMMON-PRIOR> 12,541
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (55,375)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,081,952)
<NET-ASSETS> 134,435
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7,859
<OTHER-INCOME> 0
<EXPENSES-NET> 1,414
<NET-INVESTMENT-INCOME> 6,445
<REALIZED-GAINS-CURRENT> 127
<APPREC-INCREASE-CURRENT> (3,223)
<NET-CHANGE-FROM-OPS> 3,349
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 7,430
<DISTRIBUTIONS-OF-GAINS> 174
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20,024
<NUMBER-OF-SHARES-REDEEMED> 19,858
<SHARES-REINVESTED> 761
<NET-CHANGE-IN-ASSETS> 5,081
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (75,661)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,012,716
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,313,574
<AVERAGE-NET-ASSETS> 134,125
<PER-SHARE-NAV-BEGIN> 10.31
<PER-SHARE-NII> 0.50
<PER-SHARE-GAIN-APPREC> (0.24)
<PER-SHARE-DIVIDEND> (0.58)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.98
<EXPENSE-RATIO> 1.05
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 022
<NAME> Short Term Bond Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 216,044,602
<INVESTMENTS-AT-VALUE> 212,962,650
<RECEIVABLES> 2,627,688
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 1,473
<TOTAL-ASSETS> 215,591,811
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 988,371
<TOTAL-LIABILITIES> 988,371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217,740,767
<SHARES-COMMON-STOCK> 1,523,579
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (55,375)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,081,952)
<NET-ASSETS> 1,523,579
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 21,884
<OTHER-INCOME> 0
<EXPENSES-NET> 2,673
<NET-INVESTMENT-INCOME> 19,211
<REALIZED-GAINS-CURRENT> (395)
<APPREC-INCREASE-CURRENT> (7,120)
<NET-CHANGE-FROM-OPS> 11,696
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 87,823
<DISTRIBUTIONS-OF-GAINS> 1,874
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 250,614
<NUMBER-OF-SHARES-REDEEMED> 106,119
<SHARES-REINVESTED> 9,033
<NET-CHANGE-IN-ASSETS> 1,523,579
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (75,661)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,012,716
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,313,574
<AVERAGE-NET-ASSETS> 535,447
<PER-SHARE-NAV-BEGIN> 10.42
<PER-SHARE-NII> 0.38
<PER-SHARE-GAIN-APPREC> (0.23)
<PER-SHARE-DIVIDEND> (0.64)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.92
<EXPENSE-RATIO> 0.75
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 023
<NAME> Short Term Bond Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 216,044,602
<INVESTMENTS-AT-VALUE> 212,962,650
<RECEIVABLES> 2,627,688
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 1,473
<TOTAL-ASSETS> 215,591,811
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 988,371
<TOTAL-LIABILITIES> 988,371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217,740,767
<SHARES-COMMON-STOCK> 1,808,109
<SHARES-COMMON-PRIOR> 26,073
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (55,375)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,081,952)
<NET-ASSETS> 1,808,109
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 33,240
<OTHER-INCOME> 0
<EXPENSES-NET> 3,329
<NET-INVESTMENT-INCOME> 29,911
<REALIZED-GAINS-CURRENT> (355)
<APPREC-INCREASE-CURRENT> (11,693)
<NET-CHANGE-FROM-OPS> 17,863
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 110,676
<DISTRIBUTIONS-OF-GAINS> 2,352
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 231,843
<NUMBER-OF-SHARES-REDEEMED> 87,675
<SHARES-REINVESTED> 11,337
<NET-CHANGE-IN-ASSETS> 1,539,325
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (75,661)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,012,716
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,313,574
<AVERAGE-NET-ASSETS> 549,085
<PER-SHARE-NAV-BEGIN> 10.31
<PER-SHARE-NII> 0.57
<PER-SHARE-GAIN-APPREC> (0.27)
<PER-SHARE-DIVIDEND> (0.64)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.96
<EXPENSE-RATIO> 0.61
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 024
<NAME> Short Term Bond Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 216,044,602
<INVESTMENTS-AT-VALUE> 212,962,650
<RECEIVABLES> 2,627,688
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 1,473
<TOTAL-ASSETS> 215,591,811
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 988,371
<TOTAL-LIABILITIES> 988,371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 217,740,767
<SHARES-COMMON-STOCK> 211,137,317
<SHARES-COMMON-PRIOR> 27,529,935
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (55,375)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,081,952)
<NET-ASSETS> 211,137,317
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 14,162,364
<OTHER-INCOME> 0
<EXPENSES-NET> 1,306,158
<NET-INVESTMENT-INCOME> 12,856,206
<REALIZED-GAINS-CURRENT> 292,503
<APPREC-INCREASE-CURRENT> (5,904,676)
<NET-CHANGE-FROM-OPS> 7,244,033
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 12,707,318
<DISTRIBUTIONS-OF-GAINS> 272,917
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,231,576
<NUMBER-OF-SHARES-REDEEMED> 13,888,005
<SHARES-REINVESTED> 1,300,624
<NET-CHANGE-IN-ASSETS> (72,535,877)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (75,661)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,012,716
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,313,574
<AVERAGE-NET-ASSETS> 240,637,817
<PER-SHARE-NAV-BEGIN> 10.30
<PER-SHARE-NII> 0.56
<PER-SHARE-GAIN-APPREC> (0.24)
<PER-SHARE-DIVIDEND> (0.64)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.97
<EXPENSE-RATIO> 0.54
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 031
<NAME> Core Bond Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 766,171,751
<INVESTMENTS-AT-VALUE> 743,845,358
<RECEIVABLES> 18,691,048
<ASSETS-OTHER> 3,868
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 762,540,274
<PAYABLE-FOR-SECURITIES> 35,000
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 146,095,116
<TOTAL-LIABILITIES> 146,130,116
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 646,161,570
<SHARES-COMMON-STOCK> 56,903
<SHARES-COMMON-PRIOR> 12,774
<ACCUMULATED-NII-CURRENT> 604,525
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,012,044)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,343,893)
<NET-ASSETS> 575,867
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 18,838
<OTHER-INCOME> 0
<EXPENSES-NET> 2,980
<NET-INVESTMENT-INCOME> 15,858
<REALIZED-GAINS-CURRENT> (4,336)
<APPREC-INCREASE-CURRENT> (13,160)
<NET-CHANGE-FROM-OPS> (1,638)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 35,668
<DISTRIBUTIONS-OF-GAINS> 159
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 52,002
<NUMBER-OF-SHARES-REDEEMED> 11,402
<SHARES-REINVESTED> 3,529
<NET-CHANGE-IN-ASSETS> 434,552
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 493,441
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,976,384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,643,437
<AVERAGE-NET-ASSETS> 278,323
<PER-SHARE-NAV-BEGIN> 11.06
<PER-SHARE-NII> 0.62
<PER-SHARE-GAIN-APPREC> (0.89)
<PER-SHARE-DIVIDEND> (0.66)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.12
<EXPENSE-RATIO> 1.07
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 032
<NAME> Core Bond Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 766,171,751
<INVESTMENTS-AT-VALUE> 743,845,358
<RECEIVABLES> 18,691,048
<ASSETS-OTHER> 3,868
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 762,540,274
<PAYABLE-FOR-SECURITIES> 35,000
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 146,095,116
<TOTAL-LIABILITIES> 146,130,116
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 646,161,570
<SHARES-COMMON-STOCK> 233,482
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 604,525
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,012,044)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,343,893)
<NET-ASSETS> 2,361,409
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 36,876
<OTHER-INCOME> 0
<EXPENSES-NET> 4,278
<NET-INVESTMENT-INCOME> 32,598
<REALIZED-GAINS-CURRENT> (8,943)
<APPREC-INCREASE-CURRENT> (22,625)
<NET-CHANGE-FROM-OPS> 1,030
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 145,284
<DISTRIBUTIONS-OF-GAINS> 214
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 314,607
<NUMBER-OF-SHARES-REDEEMED> 95,473
<SHARES-REINVESTED> 14,348
<NET-CHANGE-IN-ASSETS> 2,361,409
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 493,441
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,976,384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,643,437
<AVERAGE-NET-ASSETS> 801,886
<PER-SHARE-NAV-BEGIN> 10.97
<PER-SHARE-NII> 0.44
<PER-SHARE-GAIN-APPREC> (0.61)
<PER-SHARE-DIVIDEND> (0.68)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.11
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 033
<NAME> Core Bond Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 766,171,751
<INVESTMENTS-AT-VALUE> 743,845,358
<RECEIVABLES> 18,691,048
<ASSETS-OTHER> 3,868
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 762,540,274
<PAYABLE-FOR-SECURITIES> 35,000
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 146,095,116
<TOTAL-LIABILITIES> 146,130,116
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 646,161,570
<SHARES-COMMON-STOCK> 1,923,720
<SHARES-COMMON-PRIOR> 36,181
<ACCUMULATED-NII-CURRENT> 604,525
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,012,044)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,343,893)
<NET-ASSETS> 19,471,026
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 341,027
<OTHER-INCOME> 0
<EXPENSES-NET> 32,128
<NET-INVESTMENT-INCOME> 308,899
<REALIZED-GAINS-CURRENT> (82,823)
<APPREC-INCREASE-CURRENT> (222,537)
<NET-CHANGE-FROM-OPS> 3,539
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,199,642
<DISTRIBUTIONS-OF-GAINS> 4,015
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,255,686
<NUMBER-OF-SHARES-REDEEMED> 486,712
<SHARES-REINVESTED> 118,565
<NET-CHANGE-IN-ASSETS> 19,070,970
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 493,441
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,976,384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,643,437
<AVERAGE-NET-ASSETS> 4,912,756
<PER-SHARE-NAV-BEGIN> 11.06
<PER-SHARE-NII> 0.68
<PER-SHARE-GAIN-APPREC> (0.92)
<PER-SHARE-DIVIDEND> (0.69)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.12
<EXPENSE-RATIO> 0.65
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 034
<NAME> Core Bond Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 766,171,751
<INVESTMENTS-AT-VALUE> 743,845,358
<RECEIVABLES> 18,691,048
<ASSETS-OTHER> 3,868
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 762,540,274
<PAYABLE-FOR-SECURITIES> 35,000
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 146,095,116
<TOTAL-LIABILITIES> 146,130,116
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 646,161,570
<SHARES-COMMON-STOCK> 58,575,122
<SHARES-COMMON-PRIOR> 64,158,721
<ACCUMULATED-NII-CURRENT> 604,525
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,012,044)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (22,343,893)
<NET-ASSETS> 594,001,856
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 41,723,223
<OTHER-INCOME> 0
<EXPENSES-NET> 3,604,051
<NET-INVESTMENT-INCOME> 38,119,172
<REALIZED-GAINS-CURRENT> (7,717,770)
<APPREC-INCREASE-CURRENT> (43,420,606)
<NET-CHANGE-FROM-OPS> (13,019,204)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 36,453,705
<DISTRIBUTIONS-OF-GAINS> 724,928
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 24,635,752
<NUMBER-OF-SHARES-REDEEMED> 33,871,158
<SHARES-REINVESTED> 3,651,807
<NET-CHANGE-IN-ASSETS> (115,457,631)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 493,441
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,976,384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,643,437
<AVERAGE-NET-ASSETS> 628,063,592
<PER-SHARE-NAV-BEGIN> 11.06
<PER-SHARE-NII> 0.66
<PER-SHARE-GAIN-APPREC> (0.89)
<PER-SHARE-DIVIDEND> (0.68)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.14
<EXPENSE-RATIO> 0.57
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 041
<NAME> Balanced Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 683,590,144
<INVESTMENTS-AT-VALUE> 808,469,206
<RECEIVABLES> 5,207,775
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 813,676,981
<PAYABLE-FOR-SECURITIES> 5,142,277
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 92,929,283
<TOTAL-LIABILITIES> 98,071,560
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 592,761,613
<SHARES-COMMON-STOCK> 43,397
<SHARES-COMMON-PRIOR> 12,465
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,035,254)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 124,879,062
<NET-ASSETS> 573,428
<DIVIDEND-INCOME> 3,610
<INTEREST-INCOME> 9,917
<OTHER-INCOME> 0
<EXPENSES-NET> 3,874
<NET-INVESTMENT-INCOME> 9,653
<REALIZED-GAINS-CURRENT> 512
<APPREC-INCREASE-CURRENT> (23,429)
<NET-CHANGE-FROM-OPS> (13,264)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 19,468
<DISTRIBUTIONS-OF-GAINS> 4,853
<DISTRIBUTIONS-OTHER> 78
<NUMBER-OF-SHARES-SOLD> 41,448
<NUMBER-OF-SHARES-REDEEMED> 12,355
<SHARES-REINVESTED> 1,839
<NET-CHANGE-IN-ASSETS> 396,418
<ACCUMULATED-NII-PRIOR> 32,992
<ACCUMULATED-GAINS-PRIOR> 8,384,459
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,739,029
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,612,615
<AVERAGE-NET-ASSETS> 335,785
<PER-SHARE-NAV-BEGIN> 14.20
<PER-SHARE-NII> 0.40
<PER-SHARE-GAIN-APPREC> (0.70)
<PER-SHARE-DIVIDEND> (0.47)
<PER-SHARE-DISTRIBUTIONS> (0.22)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.21
<EXPENSE-RATIO> 1.15
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 042
<NAME> Balanced Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 683,590,144
<INVESTMENTS-AT-VALUE> 808,469,206
<RECEIVABLES> 5,207,775
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 813,676,981
<PAYABLE-FOR-SECURITIES> 5,142,277
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 92,929,283
<TOTAL-LIABILITIES> 98,071,560
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 592,761,613
<SHARES-COMMON-STOCK> 13,083
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,035,254)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 124,879,062
<NET-ASSETS> 173,015
<DIVIDEND-INCOME> 1,163
<INTEREST-INCOME> 3,193
<OTHER-INCOME> 0
<EXPENSES-NET> 663
<NET-INVESTMENT-INCOME> 3,693
<REALIZED-GAINS-CURRENT> (172)
<APPREC-INCREASE-CURRENT> (10,211)
<NET-CHANGE-FROM-OPS> (6,690)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 6,213
<DISTRIBUTIONS-OF-GAINS> 1,926
<DISTRIBUTIONS-OTHER> 25
<NUMBER-OF-SHARES-SOLD> 12,470
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 613
<NET-CHANGE-IN-ASSETS> 173,015
<ACCUMULATED-NII-PRIOR> 32,992
<ACCUMULATED-GAINS-PRIOR> 8,384,459
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,739,029
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,612,615
<AVERAGE-NET-ASSETS> 111,670
<PER-SHARE-NAV-BEGIN> 14.62
<PER-SHARE-NII> 0.47
<PER-SHARE-GAIN-APPREC> (1.15)
<PER-SHARE-DIVIDEND> (0.50)
<PER-SHARE-DISTRIBUTIONS> (0.22)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.22
<EXPENSE-RATIO> 0.89
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 043
<NAME> Balanced Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 683,590,144
<INVESTMENTS-AT-VALUE> 808,469,206
<RECEIVABLES> 5,207,775
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 813,676,981
<PAYABLE-FOR-SECURITIES> 5,142,277
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 92,929,283
<TOTAL-LIABILITIES> 98,071,560
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 592,761,613
<SHARES-COMMON-STOCK> 4,484,437
<SHARES-COMMON-PRIOR> 74,030
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,035,254)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 124,879,062
<NET-ASSETS> 59,380,958
<DIVIDEND-INCOME> 576,304
<INTEREST-INCOME> 1,583,087
<OTHER-INCOME> 0
<EXPENSES-NET> 404,473
<NET-INVESTMENT-INCOME> 1,754,918
<REALIZED-GAINS-CURRENT> 67,666
<APPREC-INCREASE-CURRENT> (2,111,780)
<NET-CHANGE-FROM-OPS> (289,196)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 2,098,684
<DISTRIBUTIONS-OF-GAINS> 960,076
<DISTRIBUTIONS-OTHER> 8,376
<NUMBER-OF-SHARES-SOLD> 5,336,744
<NUMBER-OF-SHARES-REDEEMED> 1,154,966
<SHARES-REINVESTED> 228,629
<NET-CHANGE-IN-ASSETS> 58,329,702
<ACCUMULATED-NII-PRIOR> 32,992
<ACCUMULATED-GAINS-PRIOR> 8,384,459
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,739,029
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,612,615
<AVERAGE-NET-ASSETS> 54,249,809
<PER-SHARE-NAV-BEGIN> 14.20
<PER-SHARE-NII> 0.46
<PER-SHARE-GAIN-APPREC> (0.71)
<PER-SHARE-DIVIDEND> (0.49)
<PER-SHARE-DISTRIBUTIONS> (0.22)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.24
<EXPENSE-RATIO> 0.75
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 044
<NAME> Balanced Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 683,590,144
<INVESTMENTS-AT-VALUE> 808,469,206
<RECEIVABLES> 5,207,775
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 813,676,981
<PAYABLE-FOR-SECURITIES> 5,142,277
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 92,929,283
<TOTAL-LIABILITIES> 98,071,560
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 592,761,613
<SHARES-COMMON-STOCK> 49,471,112
<SHARES-COMMON-PRIOR> 54,365,582
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,035,254)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 124,879,062
<NET-ASSETS> 655,478,020
<DIVIDEND-INCOME> 7,774,854
<INTEREST-INCOME> 21,357,242
<OTHER-INCOME> 0
<EXPENSES-NET> 4,203,605
<NET-INVESTMENT-INCOME> 24,928,491
<REALIZED-GAINS-CURRENT> 1,046,481
<APPREC-INCREASE-CURRENT> (37,076,540)
<NET-CHANGE-FROM-OPS> (11,101,568)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 24,046,239
<DISTRIBUTIONS-OF-GAINS> 11,126,488
<DISTRIBUTIONS-OTHER> 95,975
<NUMBER-OF-SHARES-SOLD> 15,470,302
<NUMBER-OF-SHARES-REDEEMED> 22,990,430
<SHARES-REINVESTED> 2,625,658
<NET-CHANGE-IN-ASSETS> (116,285,333)
<ACCUMULATED-NII-PRIOR> 32,992
<ACCUMULATED-GAINS-PRIOR> 8,384,459
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,739,029
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,612,615
<AVERAGE-NET-ASSETS> 740,875,271
<PER-SHARE-NAV-BEGIN> 14.20
<PER-SHARE-NII> 0.48
<PER-SHARE-GAIN-APPREC> (0.70)
<PER-SHARE-DIVIDEND> (0.51)
<PER-SHARE-DISTRIBUTIONS> (0.22)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.25
<EXPENSE-RATIO> 0.57
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 051
<NAME> Core Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 1,975,611,465
<INVESTMENTS-AT-VALUE> 3,006,622,208
<RECEIVABLES> 11,925,414
<ASSETS-OTHER> 669,921
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,019,217,543
<PAYABLE-FOR-SECURITIES> 6,002,489
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 134,341,879
<TOTAL-LIABILITIES> 140,344,368
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,783,801,938
<SHARES-COMMON-STOCK> 112,887
<SHARES-COMMON-PRIOR> 12,354
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 64,060,494
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,031,010,743
<NET-ASSETS> 1,840,982
<DIVIDEND-INCOME> 12,818
<INTEREST-INCOME> 341
<OTHER-INCOME> 0
<EXPENSES-NET> 7,162
<NET-INVESTMENT-INCOME> 5,997
<REALIZED-GAINS-CURRENT> 77,182
<APPREC-INCREASE-CURRENT> (90,183)
<NET-CHANGE-FROM-OPS> (7,004)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 29,073
<DISTRIBUTIONS-OF-GAINS> 117,796
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 107,405
<NUMBER-OF-SHARES-REDEEMED> 15,904
<SHARES-REINVESTED> 9,032
<NET-CHANGE-IN-ASSETS> 1,613,640
<ACCUMULATED-NII-PRIOR> 106,352
<ACCUMULATED-GAINS-PRIOR> 21,039,858
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16,017,604
<INTEREST-EXPENSE> 9,036
<GROSS-EXPENSE> 18,776,836
<AVERAGE-NET-ASSETS> 652,420
<PER-SHARE-NAV-BEGIN> 18.40
<PER-SHARE-NII> 0.17
<PER-SHARE-GAIN-APPREC> (0.75)
<PER-SHARE-DIVIDEND> (0.28)
<PER-SHARE-DISTRIBUTIONS> (1.23)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.31
<EXPENSE-RATIO> 1.10
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 052
<NAME> Core Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 1,975,611,465
<INVESTMENTS-AT-VALUE> 3,006,622,208
<RECEIVABLES> 11,925,414
<ASSETS-OTHER> 669,921
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,019,217,543
<PAYABLE-FOR-SECURITIES> 6,002,489
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 134,341,879
<TOTAL-LIABILITIES> 140,344,368
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,783,801,938
<SHARES-COMMON-STOCK> 145,538
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 64,060,494
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,031,010,743
<NET-ASSETS> 2,380,008
<DIVIDEND-INCOME> 12,450
<INTEREST-INCOME> 332
<OTHER-INCOME> 0
<EXPENSES-NET> 4,250
<NET-INVESTMENT-INCOME> 8,532
<REALIZED-GAINS-CURRENT> 69,549
<APPREC-INCREASE-CURRENT> (102,157)
<NET-CHANGE-FROM-OPS> (24,076)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 39,330
<DISTRIBUTIONS-OF-GAINS> 145,744
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 190,854
<NUMBER-OF-SHARES-REDEEMED> 56,669
<SHARES-REINVESTED> 11,353
<NET-CHANGE-IN-ASSETS> 2,380,008
<ACCUMULATED-NII-PRIOR> 106,352
<ACCUMULATED-GAINS-PRIOR> 21,039,858
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16,017,604
<INTEREST-EXPENSE> 9,036
<GROSS-EXPENSE> 18,776,836
<AVERAGE-NET-ASSETS> 761,862
<PER-SHARE-NAV-BEGIN> 19.36
<PER-SHARE-NII> 0.20
<PER-SHARE-GAIN-APPREC> (1.68)
<PER-SHARE-DIVIDEND> (0.30)
<PER-SHARE-DISTRIBUTIONS> (1.23)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.35
<EXPENSE-RATIO> 0.84
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 053
<NAME> Core Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 1,975,611,465
<INVESTMENTS-AT-VALUE> 3,006,622,208
<RECEIVABLES> 11,925,414
<ASSETS-OTHER> 669,921
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,019,217,543
<PAYABLE-FOR-SECURITIES> 6,002,489
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 134,341,879
<TOTAL-LIABILITIES> 140,344,368
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,783,801,938
<SHARES-COMMON-STOCK> 1,239,389
<SHARES-COMMON-PRIOR> 40,993
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 64,060,494
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,031,010,743
<NET-ASSETS> 20,261,983
<DIVIDEND-INCOME> 117,350
<INTEREST-INCOME> 3,126
<OTHER-INCOME> 0
<EXPENSES-NET> 42,626
<NET-INVESTMENT-INCOME> 77,850
<REALIZED-GAINS-CURRENT> 711,956
<APPREC-INCREASE-CURRENT> (1,592,586)
<NET-CHANGE-FROM-OPS> (802,780)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 429,794
<DISTRIBUTIONS-OF-GAINS> 1,595,827
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,603,200
<NUMBER-OF-SHARES-REDEEMED> 528,923
<SHARES-REINVESTED> 124,119
<NET-CHANGE-IN-ASSETS> 19,507,929
<ACCUMULATED-NII-PRIOR> 106,352
<ACCUMULATED-GAINS-PRIOR> 21,039,858
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16,017,604
<INTEREST-EXPENSE> 9,036
<GROSS-EXPENSE> 18,776,836
<AVERAGE-NET-ASSETS> 6,186,739
<PER-SHARE-NAV-BEGIN> 18.39
<PER-SHARE-NII> 0.23
<PER-SHARE-GAIN-APPREC> (0.73)
<PER-SHARE-DIVIDEND> (0.31)
<PER-SHARE-DISTRIBUTIONS> (1.23)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.35
<EXPENSE-RATIO> 0.69
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 054
<NAME> Core Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 1,975,611,465
<INVESTMENTS-AT-VALUE> 3,006,622,208
<RECEIVABLES> 11,925,414
<ASSETS-OTHER> 669,921
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,019,217,543
<PAYABLE-FOR-SECURITIES> 6,002,489
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 134,341,879
<TOTAL-LIABILITIES> 140,344,368
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,783,801,938
<SHARES-COMMON-STOCK> 174,282,233
<SHARES-COMMON-PRIOR> 194,978,032
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 64,060,494
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,031,010,743
<NET-ASSETS> 2,854,390,202
<DIVIDEND-INCOME> 64,919,665
<INTEREST-INCOME> 1,729,435
<OTHER-INCOME> 0
<EXPENSES-NET> 18,722,798
<NET-INVESTMENT-INCOME> 47,926,302
<REALIZED-GAINS-CURRENT> 244,023,835
<APPREC-INCREASE-CURRENT> (378,360,356)
<NET-CHANGE-FROM-OPS> (86,410,219)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 48,247,083
<DISTRIBUTIONS-OF-GAINS> 199,382,279
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 36,534,385
<NUMBER-OF-SHARES-REDEEMED> 72,256,616
<SHARES-REINVESTED> 15,026,432
<NET-CHANGE-IN-ASSETS> (731,787,284)
<ACCUMULATED-NII-PRIOR> 106,352
<ACCUMULATED-GAINS-PRIOR> 21,039,858
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16,017,604
<INTEREST-EXPENSE> 9,036
<GROSS-EXPENSE> 18,776,836
<AVERAGE-NET-ASSETS> 3,309,986,520
<PER-SHARE-NAV-BEGIN> 18.39
<PER-SHARE-NII> 0.27
<PER-SHARE-GAIN-APPREC> (0.75)
<PER-SHARE-DIVIDEND> (0.30)
<PER-SHARE-DISTRIBUTIONS> (1.23)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.38
<EXPENSE-RATIO> 0.57
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 061
<NAME> Small CAP Value Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 562,879,915
<INVESTMENTS-AT-VALUE> 651,555,439
<RECEIVABLES> 5,394,381
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 656,949,820
<PAYABLE-FOR-SECURITIES> 153,810
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,309,991
<TOTAL-LIABILITIES> 10,463,801
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 547,168,394
<SHARES-COMMON-STOCK> 19,337
<SHARES-COMMON-PRIOR> 12,364
<ACCUMULATED-NII-CURRENT> 160,077
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,482,024
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 88,675,524
<NET-ASSETS> 262,254
<DIVIDEND-INCOME> 2,442
<INTEREST-INCOME> 783
<OTHER-INCOME> 0
<EXPENSES-NET> 2,301
<NET-INVESTMENT-INCOME> 924
<REALIZED-GAINS-CURRENT> 8,273
<APPREC-INCREASE-CURRENT> (8,271)
<NET-CHANGE-FROM-OPS> 926
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,763
<DISTRIBUTIONS-OF-GAINS> 6,683
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,813
<NUMBER-OF-SHARES-REDEEMED> 469
<SHARES-REINVESTED> 629
<NET-CHANGE-IN-ASSETS> 88,306
<ACCUMULATED-NII-PRIOR> 126,877
<ACCUMULATED-GAINS-PRIOR> 658,938
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,728,581
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,373,085
<AVERAGE-NET-ASSETS> 189,248
<PER-SHARE-NAV-BEGIN> 14.07
<PER-SHARE-NII> 0.07
<PER-SHARE-GAIN-APPREC> (0.13)
<PER-SHARE-DIVIDEND> (0.09)
<PER-SHARE-DISTRIBUTIONS> (0.36)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.56
<EXPENSE-RATIO> 1.22
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 062
<NAME> Small CAP Value Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 562,879,915
<INVESTMENTS-AT-VALUE> 651,555,439
<RECEIVABLES> 5,394,381
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 656,949,820
<PAYABLE-FOR-SECURITIES> 153,810
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,309,991
<TOTAL-LIABILITIES> 10,463,801
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 547,168,394
<SHARES-COMMON-STOCK> 120,566
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 160,077
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,482,024
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 88,675,524
<NET-ASSETS> 1,634,087
<DIVIDEND-INCOME> 5,007
<INTEREST-INCOME> 1,605
<OTHER-INCOME> 0
<EXPENSES-NET> 3,506
<NET-INVESTMENT-INCOME> 3,106
<REALIZED-GAINS-CURRENT> 24,432
<APPREC-INCREASE-CURRENT> (13,626)
<NET-CHANGE-FROM-OPS> 13,912
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 16,505
<DISTRIBUTIONS-OF-GAINS> 39,188
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 171,086
<NUMBER-OF-SHARES-REDEEMED> 54,682
<SHARES-REINVESTED> 4,162
<NET-CHANGE-IN-ASSETS> 1,634,087
<ACCUMULATED-NII-PRIOR> 126,877
<ACCUMULATED-GAINS-PRIOR> 658,938
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,728,581
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,373,085
<AVERAGE-NET-ASSETS> 559,383
<PER-SHARE-NAV-BEGIN> 13.66
<PER-SHARE-NII> 0.08
<PER-SHARE-GAIN-APPREC> 0.32
<PER-SHARE-DIVIDEND> (0.15)
<PER-SHARE-DISTRIBUTIONS> (0.36)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.55
<EXPENSE-RATIO> 0.94
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 063
<NAME> Small CAP Value Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 562,879,915
<INVESTMENTS-AT-VALUE> 651,555,439
<RECEIVABLES> 5,394,381
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 656,949,820
<PAYABLE-FOR-SECURITIES> 153,810
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,309,991
<TOTAL-LIABILITIES> 10,463,801
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 547,168,394
<SHARES-COMMON-STOCK> 294,351
<SHARES-COMMON-PRIOR> 40,399
<ACCUMULATED-NII-CURRENT> 160,077
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,482,024
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 88,675,524
<NET-ASSETS> 3,990,031
<DIVIDEND-INCOME> 15,086
<INTEREST-INCOME> 4,835
<OTHER-INCOME> 0
<EXPENSES-NET> 9,609
<NET-INVESTMENT-INCOME> 10,312
<REALIZED-GAINS-CURRENT> 45,743
<APPREC-INCREASE-CURRENT> (10,085)
<NET-CHANGE-FROM-OPS> 45,970
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 48,682
<DISTRIBUTIONS-OF-GAINS> 113,305
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 320,351
<NUMBER-OF-SHARES-REDEEMED> 78,501
<SHARES-REINVESTED> 12,102
<NET-CHANGE-IN-ASSETS> 3,421,918
<ACCUMULATED-NII-PRIOR> 126,877
<ACCUMULATED-GAINS-PRIOR> 658,938
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,728,581
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,373,085
<AVERAGE-NET-ASSETS> 1,201,271
<PER-SHARE-NAV-BEGIN> 14.06
<PER-SHARE-NII> 0.12
<PER-SHARE-GAIN-APPREC> (0.11)
<PER-SHARE-DIVIDEND> (0.15)
<PER-SHARE-DISTRIBUTIONS> (0.36)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.56
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 064
<NAME> Small CAP Value Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 562,879,915
<INVESTMENTS-AT-VALUE> 651,555,439
<RECEIVABLES> 5,394,381
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 656,949,820
<PAYABLE-FOR-SECURITIES> 153,810
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,309,991
<TOTAL-LIABILITIES> 10,463,801
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 547,168,394
<SHARES-COMMON-STOCK> 47,176,673
<SHARES-COMMON-PRIOR> 48,544,773
<ACCUMULATED-NII-CURRENT> 160,077
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,482,024
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 88,675,524
<NET-ASSETS> 640,599,647
<DIVIDEND-INCOME> 8,396,119
<INTEREST-INCOME> 2,691,234
<OTHER-INCOME> 0
<EXPENSES-NET> 4,357,669
<NET-INVESTMENT-INCOME> 6,729,684
<REALIZED-GAINS-CURRENT> 26,427,471
<APPREC-INCREASE-CURRENT> (30,451,411)
<NET-CHANGE-FROM-OPS> 2,705,744
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 6,643,376
<DISTRIBUTIONS-OF-GAINS> 16,524,157
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 15,290,501
<NUMBER-OF-SHARES-REDEEMED> 18,384,285
<SHARES-REINVESTED> 1,725,684
<NET-CHANGE-IN-ASSETS> (41,978,077)
<ACCUMULATED-NII-PRIOR> 126,877
<ACCUMULATED-GAINS-PRIOR> 658,938
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,728,581
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,373,085
<AVERAGE-NET-ASSETS> 652,052,448
<PER-SHARE-NAV-BEGIN> 14.06
<PER-SHARE-NII> 0.14
<PER-SHARE-GAIN-APPREC> (0.11)
<PER-SHARE-DIVIDEND> (0.15)
<PER-SHARE-DISTRIBUTIONS> (0.36)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.58
<EXPENSE-RATIO> 0.67
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 071
<NAME> International Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 855,296,369
<INVESTMENTS-AT-VALUE> 1,209,057,158
<RECEIVABLES> 5,638,846
<ASSETS-OTHER> 85,628
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,214,781,632
<PAYABLE-FOR-SECURITIES> 10,269,891
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99,435,731
<TOTAL-LIABILITIES> 109,705,622
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 747,526,918
<SHARES-COMMON-STOCK> 32,406
<SHARES-COMMON-PRIOR> 11,834
<ACCUMULATED-NII-CURRENT> (13,663)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,821,497
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 353,741,258
<NET-ASSETS> 547,978
<DIVIDEND-INCOME> 2,123
<INTEREST-INCOME> 390
<OTHER-INCOME> 0
<EXPENSES-NET> 3,063
<NET-INVESTMENT-INCOME> (550)
<REALIZED-GAINS-CURRENT> 11,204
<APPREC-INCREASE-CURRENT> 135,939
<NET-CHANGE-FROM-OPS> 146,593
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 132
<DISTRIBUTIONS-OF-GAINS> 22,842
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20,124
<NUMBER-OF-SHARES-REDEEMED> 940
<SHARES-REINVESTED> 1,388
<NET-CHANGE-IN-ASSETS> 413,395
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 5,183,290
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,353,553
<INTEREST-EXPENSE> 6,978
<GROSS-EXPENSE> 7,909,314
<AVERAGE-NET-ASSETS> 198,058
<PER-SHARE-NAV-BEGIN> 11.37
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 6.39
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.81)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.91
<EXPENSE-RATIO> 1.55
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 072
<NAME> International Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 855,296,369
<INVESTMENTS-AT-VALUE> 1,209,057,158
<RECEIVABLES> 5,638,846
<ASSETS-OTHER> 85,628
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,214,781,632
<PAYABLE-FOR-SECURITIES> 10,269,891
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99,435,731
<TOTAL-LIABILITIES> 109,705,622
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 747,526,918
<SHARES-COMMON-STOCK> 434,136
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> (13,663)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,821,497
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 353,741,258
<NET-ASSETS> 7,334,664
<DIVIDEND-INCOME> 8,210
<INTEREST-INCOME> 1,509
<OTHER-INCOME> 0
<EXPENSES-NET> 17,040
<NET-INVESTMENT-INCOME> (7,321)
<REALIZED-GAINS-CURRENT> 60,594
<APPREC-INCREASE-CURRENT> 1,814,229
<NET-CHANGE-FROM-OPS> 1,867,502
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 13,159
<DISTRIBUTIONS-OF-GAINS> 291,010
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 547,706
<NUMBER-OF-SHARES-REDEEMED> 131,642
<SHARES-REINVESTED> 18,072
<NET-CHANGE-IN-ASSETS> 7,334,664
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 5,183,290
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,353,553
<INTEREST-EXPENSE> 6,978
<GROSS-EXPENSE> 7,909,314
<AVERAGE-NET-ASSETS> 2,033,612
<PER-SHARE-NAV-BEGIN> 12.00
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 5.78
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> (0.81)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.89
<EXPENSE-RATIO> 1.26
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 073
<NAME> International Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 855,296,369
<INVESTMENTS-AT-VALUE> 1,209,057,158
<RECEIVABLES> 5,638,846
<ASSETS-OTHER> 85,628
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,214,781,632
<PAYABLE-FOR-SECURITIES> 10,269,891
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99,435,731
<TOTAL-LIABILITIES> 109,705,622
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 747,526,918
<SHARES-COMMON-STOCK> 550,802
<SHARES-COMMON-PRIOR> 44,247
<ACCUMULATED-NII-CURRENT> (13,663)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,821,497
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 353,741,258
<NET-ASSETS> 9,335,172
<DIVIDEND-INCOME> 19,851
<INTEREST-INCOME> 3,648
<OTHER-INCOME> 0
<EXPENSES-NET> 25,516
<NET-INVESTMENT-INCOME> (2,017)
<REALIZED-GAINS-CURRENT> 117,346
<APPREC-INCREASE-CURRENT> 2,230,401
<NET-CHANGE-FROM-OPS> 2,345,730
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 17,720
<DISTRIBUTIONS-OF-GAINS> 372,924
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 568,711
<NUMBER-OF-SHARES-REDEEMED> 85,588
<SHARES-REINVESTED> 23,432
<NET-CHANGE-IN-ASSETS> 8,832,254
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 5,183,290
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,353,553
<INTEREST-EXPENSE> 6,978
<GROSS-EXPENSE> 7,909,314
<AVERAGE-NET-ASSETS> 2,294,946
<PER-SHARE-NAV-BEGIN> 11.37
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 6.44
<PER-SHARE-DIVIDEND> (0.04)
<PER-SHARE-DISTRIBUTIONS> (0.81)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.95
<EXPENSE-RATIO> 1.11
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the year ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 074
<NAME> International Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 855,296,369
<INVESTMENTS-AT-VALUE> 1,209,057,158
<RECEIVABLES> 5,638,846
<ASSETS-OTHER> 85,628
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,214,781,632
<PAYABLE-FOR-SECURITIES> 10,269,891
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 99,435,731
<TOTAL-LIABILITIES> 109,705,622
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 747,526,918
<SHARES-COMMON-STOCK> 64,125,327
<SHARES-COMMON-PRIOR> 56,352,157
<ACCUMULATED-NII-CURRENT> (13,663)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,821,497
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 353,741,258
<NET-ASSETS> 1,087,858,196
<DIVIDEND-INCOME> 9,255,246
<INTEREST-INCOME> 1,700,848
<OTHER-INCOME> 0
<EXPENSES-NET> 7,863,695
<NET-INVESTMENT-INCOME> 3,092,399
<REALIZED-GAINS-CURRENT> 47,800,838
<APPREC-INCREASE-CURRENT> 336,610,046
<NET-CHANGE-FROM-OPS> 387,503,283
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,820,199
<DISTRIBUTIONS-OF-GAINS> 49,909,963
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 36,807,063
<NUMBER-OF-SHARES-REDEEMED> 32,217,521
<SHARES-REINVESTED> 3,183,628
<NET-CHANGE-IN-ASSETS> 447,360,347
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 5,183,290
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,353,553
<INTEREST-EXPENSE> 6,978
<GROSS-EXPENSE> 7,909,314
<AVERAGE-NET-ASSETS> 743,563,035
<PER-SHARE-NAV-BEGIN> 11.37
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 6.38
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> (0.81)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.96
<EXPENSE-RATIO> 1.06
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 81
<NAME> Indexed Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 10-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 862,288,631
<RECEIVABLES> 2,934,295
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 865,222,926
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,712,347
<TOTAL-LIABILITIES> 1,712,347
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 723,758,296
<SHARES-COMMON-STOCK> 149,637
<SHARES-COMMON-PRIOR> 10,026
<ACCUMULATED-NII-CURRENT> 82,885
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,539,605
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 137,129,793
<NET-ASSETS> 2,066,031
<DIVIDEND-INCOME> 6,489
<INTEREST-INCOME> 1,437
<OTHER-INCOME> 0
<EXPENSES-NET> 4,669
<NET-INVESTMENT-INCOME> 3,257
<REALIZED-GAINS-CURRENT> (13,307)
<APPREC-INCREASE-CURRENT> 184,066
<NET-CHANGE-FROM-OPS> 174,016
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 15,268
<DISTRIBUTIONS-OF-GAINS> 19,403
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 157,478
<NUMBER-OF-SHARES-REDEEMED> 20,398
<SHARES-REINVESTED> 2,531
<NET-CHANGE-IN-ASSETS> 1,947,638
<ACCUMULATED-NII-PRIOR> 631,540
<ACCUMULATED-GAINS-PRIOR> 2,030,590
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 266,810
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,234,673
<AVERAGE-NET-ASSETS> 649,899
<PER-SHARE-NAV-BEGIN> 11.81
<PER-SHARE-NII> 0.07
<PER-SHARE-GAIN-APPREC> 2.18
<PER-SHARE-DIVIDEND> (0.10)
<PER-SHARE-DISTRIBUTIONS> (0.15)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.81
<EXPENSE-RATIO> 0.85
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 82
<NAME> Indexed Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 862,288,631
<RECEIVABLES> 2,934,295
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 865,222,926
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,712,347
<TOTAL-LIABILITIES> 1,712,347
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 723,758,296
<SHARES-COMMON-STOCK> 128,361
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 82,885
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,539,605
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 137,129,793
<NET-ASSETS> 1,772,012
<DIVIDEND-INCOME> 3,863
<INTEREST-INCOME> 856
<OTHER-INCOME> 0
<EXPENSES-NET> 1,877
<NET-INVESTMENT-INCOME> 2,842
<REALIZED-GAINS-CURRENT> (14,669)
<APPREC-INCREASE-CURRENT> 161,999
<NET-CHANGE-FROM-OPS> 150,172
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 15,109
<DISTRIBUTIONS-OF-GAINS> 15,415
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 133,785
<NUMBER-OF-SHARES-REDEEMED> 7,644
<SHARES-REINVESTED> 2,220
<NET-CHANGE-IN-ASSETS> 1,772,012
<ACCUMULATED-NII-PRIOR> 631,540
<ACCUMULATED-GAINS-PRIOR> 2,030,590
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 266,810
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,234,673
<AVERAGE-NET-ASSETS> 627,352
<PER-SHARE-NAV-BEGIN> 13.11
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 0.90
<PER-SHARE-DIVIDEND> (0.12)
<PER-SHARE-DISTRIBUTIONS> (0.15)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.80
<EXPENSE-RATIO> 0.60
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 84
<NAME> Indexed Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 10-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 862,288,631
<RECEIVABLES> 2,934,295
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 865,222,926
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,712,347
<TOTAL-LIABILITIES> 1,712,347
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 723,758,296
<SHARES-COMMON-STOCK> 58,621,988
<SHARES-COMMON-PRIOR> 36,085,949
<ACCUMULATED-NII-CURRENT> 82,885
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,539,605
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 137,129,793
<NET-ASSETS> 813,419,044
<DIVIDEND-INCOME> 6,291,639
<INTEREST-INCOME> 1,393,630
<OTHER-INCOME> 0
<EXPENSES-NET> 2,164,719
<NET-INVESTMENT-INCOME> 5,520,550
<REALIZED-GAINS-CURRENT> 9,756,333
<APPREC-INCREASE-CURRENT> 94,811,635
<NET-CHANGE-FROM-OPS> 110,088,518
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 5,820,953
<DISTRIBUTIONS-OF-GAINS> 8,586,752
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 38,235,209
<NUMBER-OF-SHARES-REDEEMED> 16,751,920
<SHARES-REINVESTED> 1,052,750
<NET-CHANGE-IN-ASSETS> 386,732,289
<ACCUMULATED-NII-PRIOR> 631,540
<ACCUMULATED-GAINS-PRIOR> 2,030,590
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 266,810
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,234,673
<AVERAGE-NET-ASSETS> 618,127,292
<PER-SHARE-NAV-BEGIN> 11.82
<PER-SHARE-NII> 0.12
<PER-SHARE-GAIN-APPREC> 2.19
<PER-SHARE-DIVIDEND> (0.10)
<PER-SHARE-DISTRIBUTIONS> (0.15)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.88
<EXPENSE-RATIO> 0.42
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 83
<NAME> Indexed Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 10-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 862,288,631
<RECEIVABLES> 2,934,295
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 865,222,926
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,712,347
<TOTAL-LIABILITIES> 1,712,347
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 723,758,296
<SHARES-COMMON-STOCK> 3,348,812
<SHARES-COMMON-PRIOR> 72,852
<ACCUMULATED-NII-CURRENT> 82,885
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,539,605
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 137,129,793
<NET-ASSETS> 46,253,492
<DIVIDEND-INCOME> 170,139
<INTEREST-INCOME> 37,687
<OTHER-INCOME> 0
<EXPENSES-NET> 63,408
<NET-INVESTMENT-INCOME> 144,418
<REALIZED-GAINS-CURRENT> (172,034)
<APPREC-INCREASE-CURRENT> 4,393,370
<NET-CHANGE-FROM-OPS> 4,365,754
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 368,392
<DISTRIBUTIONS-OF-GAINS> 425,843
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,004,645
<NUMBER-OF-SHARES-REDEEMED> 786,666
<SHARES-REINVESTED> 57,981
<NET-CHANGE-IN-ASSETS> 45,394,701
<ACCUMULATED-NII-PRIOR> 631,540
<ACCUMULATED-GAINS-PRIOR> 2,030,590
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 266,810
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,234,673
<AVERAGE-NET-ASSETS> 16,888,679
<PER-SHARE-NAV-BEGIN> 11.79
<PER-SHARE-NII> 0.11
<PER-SHARE-GAIN-APPREC> 2.18
<PER-SHARE-DIVIDEND> (0.12)
<PER-SHARE-DISTRIBUTIONS> (0.15)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.81
<EXPENSE-RATIO> 0.44
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 091
<NAME> Growth Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 94,994,332
<INVESTMENTS-AT-VALUE> 114,273,012
<RECEIVABLES> 1,291,928
<ASSETS-OTHER> 886,048
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 116,450,988
<PAYABLE-FOR-SECURITIES> 2,141,144
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,880,899
<TOTAL-LIABILITIES> 8,022,043
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 87,228,046
<SHARES-COMMON-STOCK> 184,482
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> (14,817)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,937,012
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19,278,704
<NET-ASSETS> 2,379,172
<DIVIDEND-INCOME> 1,669
<INTEREST-INCOME> 2,472
<OTHER-INCOME> 0
<EXPENSES-NET> 7,565
<NET-INVESTMENT-INCOME> (3,424)
<REALIZED-GAINS-CURRENT> 53,282
<APPREC-INCREASE-CURRENT> 385,316
<NET-CHANGE-FROM-OPS> 435,174
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 4,845
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 204,224
<NUMBER-OF-SHARES-REDEEMED> 20,122
<SHARES-REINVESTED> 380
<NET-CHANGE-IN-ASSETS> 2,379,172
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 208,278
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 314,275
<AVERAGE-NET-ASSETS> 757,869
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 2.98
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.03)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.90
<EXPENSE-RATIO> 1.50
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 092
<NAME> Growth Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 94,994,332
<INVESTMENTS-AT-VALUE> 114,273,012
<RECEIVABLES> 1,291,928
<ASSETS-OTHER> 886,048
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 116,450,988
<PAYABLE-FOR-SECURITIES> 2,141,144
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,880,899
<TOTAL-LIABILITIES> 8,022,043
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 87,228,046
<SHARES-COMMON-STOCK> 689,509
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> (14,817)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,937,012
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19,278,704
<NET-ASSETS> 8,912,104
<DIVIDEND-INCOME> 6,222
<INTEREST-INCOME> 9,218
<OTHER-INCOME> 0
<EXPENSES-NET> 23,039
<NET-INVESTMENT-INCOME> (7,599)
<REALIZED-GAINS-CURRENT> 220,821
<APPREC-INCREASE-CURRENT> 1,579,272
<NET-CHANGE-FROM-OPS> 1,792,494
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 17,880
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 781,425
<NUMBER-OF-SHARES-REDEEMED> 93,315
<SHARES-REINVESTED> 1,399
<NET-CHANGE-IN-ASSETS> 8,912,104
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 208,278
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 314,275
<AVERAGE-NET-ASSETS> 2,766,611
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.03)
<PER-SHARE-GAIN-APPREC> 2.99
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.03)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.93
<EXPENSE-RATIO> 1.25
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 093
<NAME> Growth Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 94,994,332
<INVESTMENTS-AT-VALUE> 114,273,012
<RECEIVABLES> 1,291,928
<ASSETS-OTHER> 886,048
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 116,450,988
<PAYABLE-FOR-SECURITIES> 2,141,144
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,880,899
<TOTAL-LIABILITIES> 8,022,043
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 87,228,046
<SHARES-COMMON-STOCK> 2,643,532
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> (14,817)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,937,012
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19,278,704
<NET-ASSETS> 34,169,631
<DIVIDEND-INCOME> 22,790
<INTEREST-INCOME> 33,762
<OTHER-INCOME> 0
<EXPENSES-NET> 73,749
<NET-INVESTMENT-INCOME> (17,197)
<REALIZED-GAINS-CURRENT> 809,248
<APPREC-INCREASE-CURRENT> 6,028,352
<NET-CHANGE-FROM-OPS> 6,820,403
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 68,299
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,953,387
<NUMBER-OF-SHARES-REDEEMED> 315,199
<SHARES-REINVESTED> 5,344
<NET-CHANGE-IN-ASSETS> 34,169,631
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 208,278
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 314,275
<AVERAGE-NET-ASSETS> 9,891,018
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 2.98
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.03)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.93
<EXPENSE-RATIO> 1.12
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 094
<NAME> Growth Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 94,994,332
<INVESTMENTS-AT-VALUE> 114,273,012
<RECEIVABLES> 1,291,928
<ASSETS-OTHER> 886,048
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 116,450,988
<PAYABLE-FOR-SECURITIES> 2,141,144
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,880,899
<TOTAL-LIABILITIES> 8,022,043
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 87,228,046
<SHARES-COMMON-STOCK> 4,869,675
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> (14,817)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,937,012
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 19,278,704
<NET-ASSETS> 62,968,038
<DIVIDEND-INCOME> 75,571
<INTEREST-INCOME> 111,955
<OTHER-INCOME> 0
<EXPENSES-NET> 209,922
<NET-INVESTMENT-INCOME> (22,396)
<REALIZED-GAINS-CURRENT> 1,108,444
<APPREC-INCREASE-CURRENT> 11,285,764
<NET-CHANGE-FROM-OPS> 12,371,812
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 127,960
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,330,081
<NUMBER-OF-SHARES-REDEEMED> 470,411
<SHARES-REINVESTED> 10,005
<NET-CHANGE-IN-ASSETS> 62,968,038
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 208,278
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 314,275
<AVERAGE-NET-ASSETS> 32,591,196
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 2.97
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.03)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.93
<EXPENSE-RATIO> 0.97
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 101
<NAME> Mid Cap Growth Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 84,778,556
<INVESTMENTS-AT-VALUE> 107,742,565
<RECEIVABLES> 244,220
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 107,986,785
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 431,623
<TOTAL-LIABILITIES> 431,623
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 79,684,260
<SHARES-COMMON-STOCK> 49,035
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,906,893
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22,964,009
<NET-ASSETS> 681,736
<DIVIDEND-INCOME> 250
<INTEREST-INCOME> 480
<OTHER-INCOME> 0
<EXPENSES-NET> 2,004
<NET-INVESTMENT-INCOME> (1,274)
<REALIZED-GAINS-CURRENT> 36,181
<APPREC-INCREASE-CURRENT> 128,852
<NET-CHANGE-FROM-OPS> 163,759
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 52,662
<NUMBER-OF-SHARES-REDEEMED> 3,627
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 681,736
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 238,543
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,857
<AVERAGE-NET-ASSETS> 221,515
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.07)
<PER-SHARE-GAIN-APPREC> 3.97
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.90
<EXPENSE-RATIO> 1.36
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 102
<NAME> Mid Cap Growth Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 84,778,556
<INVESTMENTS-AT-VALUE> 107,742,565
<RECEIVABLES> 244,220
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 107,986,785
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 431,623
<TOTAL-LIABILITIES> 431,623
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 79,684,260
<SHARES-COMMON-STOCK> 333,258
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,906,893
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22,964,009
<NET-ASSETS> 4,642,239
<DIVIDEND-INCOME> 1,541
<INTEREST-INCOME> 2,965
<OTHER-INCOME> 0
<EXPENSES-NET> 10,312
<NET-INVESTMENT-INCOME> (5,806)
<REALIZED-GAINS-CURRENT> 257,345
<APPREC-INCREASE-CURRENT> 926,117
<NET-CHANGE-FROM-OPS> 1,177,656
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 348,047
<NUMBER-OF-SHARES-REDEEMED> 14,789
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 4,642,239
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 238,543
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,857
<AVERAGE-NET-ASSETS> 1,381,941
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 3.98
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.93
<EXPENSE-RATIO> 1.12
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 103
<NAME> Mid Cap Growth Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 84,778,556
<INVESTMENTS-AT-VALUE> 107,742,565
<RECEIVABLES> 244,220
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 107,986,785
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 431,623
<TOTAL-LIABILITIES> 431,623
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 79,684,260
<SHARES-COMMON-STOCK> 3,008,800
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,906,893
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22,964,009
<NET-ASSETS> 41,952,177
<DIVIDEND-INCOME> 14,413
<INTEREST-INCOME> 27,734
<OTHER-INCOME> 0
<EXPENSES-NET> 81,905
<NET-INVESTMENT-INCOME> (39,758)
<REALIZED-GAINS-CURRENT> 2,358,608
<APPREC-INCREASE-CURRENT> 8,939,039
<NET-CHANGE-FROM-OPS> 11,257,889
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,317,139
<NUMBER-OF-SHARES-REDEEMED> 308,339
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 41,952,177
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 238,543
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,857
<AVERAGE-NET-ASSETS> 12,535,464
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 3.98
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.94
<EXPENSE-RATIO> 0.98
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 104
<NAME> Mid Cap Growth Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 84,778,556
<INVESTMENTS-AT-VALUE> 107,742,565
<RECEIVABLES> 244,220
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 107,986,785
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 431,623
<TOTAL-LIABILITIES> 431,623
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 79,684,260
<SHARES-COMMON-STOCK> 4,325,606
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,906,893
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22,964,009
<NET-ASSETS> 60,279,010
<DIVIDEND-INCOME> 47,503
<INTEREST-INCOME> 91,405
<OTHER-INCOME> 0
<EXPENSES-NET> 218,636
<NET-INVESTMENT-INCOME> (79,728)
<REALIZED-GAINS-CURRENT> 2,381,325
<APPREC-INCREASE-CURRENT> 12,970,001
<NET-CHANGE-FROM-OPS> 15,271,598
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,926,414
<NUMBER-OF-SHARES-REDEEMED> 600,808
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 60,279,010
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 238,543
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 312,857
<AVERAGE-NET-ASSETS> 37,047,608
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 3.96
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.94
<EXPENSE-RATIO> 0.89
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 111
<NAME> Small Cap Growth Equity Fund, Class A
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 86,571,389
<INVESTMENTS-AT-VALUE> 109,948,183
<RECEIVABLES> 814,820
<ASSETS-OTHER> 12,588,503
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 123,351,506
<PAYABLE-FOR-SECURITIES> 820,556
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 13,668,434
<TOTAL-LIABILITIES> 14,488,990
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80,545,072
<SHARES-COMMON-STOCK> 109,824
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,940,650
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23,376,794
<NET-ASSETS> 1,742,351
<DIVIDEND-INCOME> 667
<INTEREST-INCOME> 3,850
<OTHER-INCOME> 0
<EXPENSES-NET> 5,782
<NET-INVESTMENT-INCOME> (1,265)
<REALIZED-GAINS-CURRENT> 96,334
<APPREC-INCREASE-CURRENT> 359,668
<NET-CHANGE-FROM-OPS> 454,737
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 18,351
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 110,847
<NUMBER-OF-SHARES-REDEEMED> 2,192
<SHARES-REINVESTED> 1,169
<NET-CHANGE-IN-ASSETS> 1,742,351
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 245,718
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 360,167
<AVERAGE-NET-ASSETS> 485,206
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.03)
<PER-SHARE-GAIN-APPREC> 6.06
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.86
<EXPENSE-RATIO> 1.79
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 112
<NAME> Small Cap Growth Equity Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 86,571,389
<INVESTMENTS-AT-VALUE> 109,948,183
<RECEIVABLES> 814,820
<ASSETS-OTHER> 12,588,503
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 123,351,506
<PAYABLE-FOR-SECURITIES> 820,556
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 13,668,434
<TOTAL-LIABILITIES> 14,488,990
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80,545,072
<SHARES-COMMON-STOCK> 138,410
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,940,650
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23,376,794
<NET-ASSETS> 2,198,371
<DIVIDEND-INCOME> 784
<INTEREST-INCOME> 4,521
<OTHER-INCOME> 0
<EXPENSES-NET> 5,770
<NET-INVESTMENT-INCOME> (465)
<REALIZED-GAINS-CURRENT> 112,045
<APPREC-INCREASE-CURRENT> 422,479
<NET-CHANGE-FROM-OPS> 534,059
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 471
<DISTRIBUTIONS-OF-GAINS> 22,915
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 166,224
<NUMBER-OF-SHARES-REDEEMED> 29,302
<SHARES-REINVESTED> 1,488
<NET-CHANGE-IN-ASSETS> 2,198,371
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 245,718
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 360,167
<AVERAGE-NET-ASSETS> 569,442
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 6.06
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.88
<EXPENSE-RATIO> 1.52
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 113
<NAME> Small Cap Growth Equity Fund, Class Y
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 86,571,389
<INVESTMENTS-AT-VALUE> 109,948,183
<RECEIVABLES> 814,820
<ASSETS-OTHER> 12,588,503
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 123,351,506
<PAYABLE-FOR-SECURITIES> 820,556
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 13,668,434
<TOTAL-LIABILITIES> 14,488,990
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80,545,072
<SHARES-COMMON-STOCK> 796,794
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,940,650
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23,376,794
<NET-ASSETS> 12,667,490
<DIVIDEND-INCOME> 3,015
<INTEREST-INCOME> 17,396
<OTHER-INCOME> 0
<EXPENSES-NET> 18,433
<NET-INVESTMENT-INCOME> 1,978
<REALIZED-GAINS-CURRENT> 506,200
<APPREC-INCREASE-CURRENT> 1,845,938
<NET-CHANGE-FROM-OPS> 2,354,116
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 6,471
<DISTRIBUTIONS-OF-GAINS> 116,771
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 898,796
<NUMBER-OF-SHARES-REDEEMED> 109,837
<SHARES-REINVESTED> 7,835
<NET-CHANGE-IN-ASSETS> 12,667,490
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 245,718
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 360,167
<AVERAGE-NET-ASSETS> 2,107,698
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.01
<PER-SHARE-GAIN-APPREC> 6.07
<PER-SHARE-DIVIDEND> (0.01)
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.90
<EXPENSE-RATIO> 1.31
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 114
<NAME> Small Cap Growth Equity Fund, Class S
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 86,571,389
<INVESTMENTS-AT-VALUE> 109,948,183
<RECEIVABLES> 814,820
<ASSETS-OTHER> 12,588,503
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 123,351,506
<PAYABLE-FOR-SECURITIES> 820,556
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 13,668,434
<TOTAL-LIABILITIES> 14,488,990
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80,545,072
<SHARES-COMMON-STOCK> 5,799,430
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,940,650
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 23,376,794
<NET-ASSETS> 92,254,304
<DIVIDEND-INCOME> 56,673
<INTEREST-INCOME> 327,058
<OTHER-INCOME> 0
<EXPENSES-NET> 330,182
<NET-INVESTMENT-INCOME> 53,549
<REALIZED-GAINS-CURRENT> 5,361,248
<APPREC-INCREASE-CURRENT> 20,748,709
<NET-CHANGE-FROM-OPS> 26,163,506
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 51,004
<DISTRIBUTIONS-OF-GAINS> 972,991
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,239,242
<NUMBER-OF-SHARES-REDEEMED> 504,868
<SHARES-REINVESTED> 65,056
<NET-CHANGE-IN-ASSETS> 92,254,304
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 245,718
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 360,167
<AVERAGE-NET-ASSETS> 41,847,643
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 6.07
<PER-SHARE-DIVIDEND> (0.01)
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.91
<EXPENSE-RATIO> 1.19
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 121
<NAME> Diversified Bond Fund, Class A
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 26,056,897
<INVESTMENTS-AT-VALUE> 25,059,254
<RECEIVABLES> 274,073
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 11,225
<TOTAL-ASSETS> 25,344,552
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 22,415
<TOTAL-LIABILITIES> 22,415
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 26,438,782
<SHARES-COMMON-STOCK> 10,508
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 1,612
<ACCUMULATED-NET-GAINS> (117,390)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (997,643)
<NET-ASSETS> 100,441
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4,659
<OTHER-INCOME> 0
<EXPENSES-NET> 782
<NET-INVESTMENT-INCOME> 3,877
<REALIZED-GAINS-CURRENT> (469)
<APPREC-INCREASE-CURRENT> (3,968)
<NET-CHANGE-FROM-OPS> (559)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 3,906
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10,100
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 408
<NET-CHANGE-IN-ASSETS> 100,441
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 83,194
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 123,845
<AVERAGE-NET-ASSETS> 98,358
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.39
<PER-SHARE-GAIN-APPREC> (0.44)
<PER-SHARE-DIVIDEND> (0.39)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.56
<EXPENSE-RATIO> 1.19
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 122
<NAME> Diversified Bond Fund, Class L
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 26,056,897
<INVESTMENTS-AT-VALUE> 25,059,254
<RECEIVABLES> 274,073
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 11,225
<TOTAL-ASSETS> 25,344,552
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 22,415
<TOTAL-LIABILITIES> 22,415
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 26,438,782
<SHARES-COMMON-STOCK> 10,525
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 1,612
<ACCUMULATED-NET-GAINS> (117,390)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (997,643)
<NET-ASSETS> 100,605
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4,663
<OTHER-INCOME> 0
<EXPENSES-NET> 619
<NET-INVESTMENT-INCOME> 4,044
<REALIZED-GAINS-CURRENT> (469)
<APPREC-INCREASE-CURRENT> (3,970)
<NET-CHANGE-FROM-OPS> (395)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 4,069
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10,100
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 425
<NET-CHANGE-IN-ASSETS> 100,605
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 83,194
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 123,845
<AVERAGE-NET-ASSETS> 98,437
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.41
<PER-SHARE-GAIN-APPREC> (0.45)
<PER-SHARE-DIVIDEND> (0.40)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.56
<EXPENSE-RATIO> 0.94
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 123
<NAME> Diversified Bond Fund, Class Y
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 26,056,897
<INVESTMENTS-AT-VALUE> 25,059,254
<RECEIVABLES> 274,073
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 11,225
<TOTAL-ASSETS> 25,344,552
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 22,415
<TOTAL-LIABILITIES> 22,415
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 26,438,782
<SHARES-COMMON-STOCK> 15,305
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 1,612
<ACCUMULATED-NET-GAINS> (117,390)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (997,643)
<NET-ASSETS> 146,274
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5,365
<OTHER-INCOME> 0
<EXPENSES-NET> 598
<NET-INVESTMENT-INCOME> 4,767
<REALIZED-GAINS-CURRENT> (483)
<APPREC-INCREASE-CURRENT> (4,300)
<NET-CHANGE-FROM-OPS> (15)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 6,010
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 14,723
<NUMBER-OF-SHARES-REDEEMED> 46
<SHARES-REINVESTED> 628
<NET-CHANGE-IN-ASSETS> 146,274
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 83,194
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 123,845
<AVERAGE-NET-ASSETS> 112,716
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.42
<PER-SHARE-GAIN-APPREC> (0.45)
<PER-SHARE-DIVIDEND> (0.41)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.56
<EXPENSE-RATIO> 0.80
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from The MassMutual Institutional Funds, Inc
form N-SAR for the period ended December 31, 1999
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 124
<NAME> Diversified Bond Fund, Class S
<S> <C>
<PERIOD-TYPE> 8-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 26,056,897
<INVESTMENTS-AT-VALUE> 25,059,254
<RECEIVABLES> 274,073
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 11,225
<TOTAL-ASSETS> 25,344,552
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 22,415
<TOTAL-LIABILITIES> 22,415
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 26,438,782
<SHARES-COMMON-STOCK> 2,612,734
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 1,612
<ACCUMULATED-NET-GAINS> (117,390)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (997,643)
<NET-ASSETS> 24,974,817
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,161,515
<OTHER-INCOME> 0
<EXPENSES-NET> 121,846
<NET-INVESTMENT-INCOME> 1,039,669
<REALIZED-GAINS-CURRENT> (114,971)
<APPREC-INCREASE-CURRENT> (985,405)
<NET-CHANGE-FROM-OPS> (60,707)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,040,982
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,533,958
<NUMBER-OF-SHARES-REDEEMED> 30,000
<SHARES-REINVESTED> 108,776
<NET-CHANGE-IN-ASSETS> 24,974,817
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 83,194
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 123,845
<AVERAGE-NET-ASSETS> 24,682,917
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.42
<PER-SHARE-GAIN-APPREC> (0.44)
<PER-SHARE-DIVIDEND> (0.42)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 9.56
<EXPENSE-RATIO> 0.74
</TABLE>
INDEPENDENT AUDITORS' REPORT
The Board of Trustees,
MassMutual Institutional Funds:
In planning and performing our audits of the financial statements of MassMutual
Institutional Funds (the "Trust") for the year ended December 31, 1999 (on which
we have issued our reports dated February 4, 2000 and February 11, 2000), we
considered its internal control, including control activities for safeguarding
securities, in order to determine our auditing procedures for the purpose of
expressing our opinion on the financial statements and to comply with the
requirements of Form N-SAR, and not to provide assurance on the Trust's internal
control.
The management of the Trust is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit pertain to the
entity's objective of preparing financial statements for external purposes that
are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use, or disposition.
Because of inherent limitations in any internal control, misstatements due to
error or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
the internal control may become inadequate because of changes in conditions, or
that the degree of compliance with policies or procedures may deteriorate.
Our consideration of the Trust's internal control would not necessarily disclose
all matters in the internal control that might be material weaknesses under
standards established by the American Institute of Certified Public Accountants.
A material weakness is a condition in which the design or operation of one or
more of the internal control components does not reduce to a relatively low
level the risk that misstatements caused by error or fraud in amounts that would
be material in relation to the financial statements being audited may occur and
not be detected within a timely period by employees in the normal course of
performing their assigned functions. However, we noted no matters involving the
Trust's internal control and its operation, including controls for safeguarding
securities, that we consider to be material weaknesses as defined above as of
December 31, 1999.
This report is intended solely for the information and use of management, the
Board of Trustees of the Trust, and the Securities and Exchange Commission and
is not intended to be and should not be used by anyone other than these
specified parties.
/s/ Deloitte & Touche LLP
February 11, 2000
Incorporated by reference to Definitive Information
Statement on Schedule 14C filed with the Securities and
Exchange Commission via EDGAR April 5, 1999
Item 77K: Changes in Registrant's certifying account
After consultation with the staff of the Securities and Exchange Commissions
("SEC") as a result of concerns regarding its independence with respect to the
Registrant, PricewaterhouseCoopers LLP ("PwC") resigned as auditors of the
Registrant, effective February 23, 1999. PwC's report on the financial
statements for the fiscal years 1996 and 1997 did not contain an adverse opinion
or a disclaimer of opinion, and was not qualified or modified as to uncertainty,
audit scope or accounting principles.
The Registrant's Audit Committee recommended engaging Deloitte & Touche LLP as
the principal accountant to audit the Registrant's financial statements for
fiscal years 1998 and 1999. The Board of Trustees approved the appointment of
Deloitte & Touche LLP at a special meeting held on March 26, 1999.
<TABLE>
<S> <C> <C> <C> <C> <C> <C>
MASSMUTUAL INSTITUTIONAL FUNDS
MMIF 10f-3 Transactions
MassMutual Mid Cap Growth Equity Fund (4th Quarter, 1999)
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Issuer Date of Total Offering / Offering Purchase Price / Underwriter
Offering Total Units Offered Price/ShareNo. Shares Affiliate
purchased
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Intertrust October 26, $117,000,000/ 6,500,000 $18.00 $9,000 / 500 Morgan Stanley
1999 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Cacheflow November $120,000,000 / $12.00 $12,000 / 500 Morgan Stanley
18, 1999 5,000,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Infonet Services December $1,076,928,300 / $21.00 $115,500 / 5500 Morgan Stanley
14, 1999 51,282,300 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Charter November 8, $3,230,000,000 / $19.00 $834,100.00 / Morgan Stanley
Communications 1999 170,000,000 shares 43,900 Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Clestica November 8, $360,000,000 / $60.00 $312,000 / 5200 Morgan Stanley
1999 6,000,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Expedia November 9, $72,800,000 / $14.00 $2,800 / 200 Morgan Stanley
1999 $5,200,000 Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Adelphia October 1, $342,000,000 / $57.00 $290,700 / 5,100 Morgan Stanley
Communications 1999 6,000,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Illuminet October 7, $74,100,000 / $19.00 $7,600 / 400 Morgan Stanley
1999 3,900,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Martha Stewart October 18, $129,600,000 / $18.00 $3,600 / 200 Morgan Stanley
Living 1999 7,200,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Biovail Corp. October 15, $224,400,000 / $51.00 $453,900 / 8,900 Morgan Stanley
1999 4,400,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Freemarkets December 9, $172,280,000 / $48.00 $9,600 / 200 Morgan Stanley
1999 3,600,000 shares Dean Witter
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
* securities were not purchased from an affiliated broker
MassMutual Small Cap Growth Equity Fund (4th Quarter, 1999)
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Issuer Date of Total Offering / Offering Purchase Underwriter Broker from
Offering Total Units Offered Price/SharePrice/Shares Affiliate whom shares
purchased
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Finisar Corp. November $154,850,000 $19.00 $11,400 / 600 JP Morgan Merrill
11, 1999 8,150,000 shares Securities Lynch
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Finisar Corp. November $154,850,000 / $19.00 $95,000 / 5,000 JP Morgan Merrill Lynch
11, 1999 8,150,000 shares Securities
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Freemarkets December 9, $172,280,000 / $48.00 $81,600 / 1,700 Advest, Inc. Morgan
1999 3,600,000 shares Stanley &
Co., Inc.
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Illuminet October 7, $74,100,000 / $19.00 $28,500 / 1,500 Jefferies & Co. Morgan
1999 3,900,000 shares Stanley &
Co., Inc.
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Martha Stewart October 18, $129,600,000 / $18.00 $81,000 / 4,500 Advest, Inc. Morgan
Living 1999 7,200,000 shares Stanley &
Co., Inc.
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
MassMutual Mid Cap Growth Equity Fund (3rd Quarter, 1999)
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Issuer Date of Total Offering Offering Purchase Underwriter
Offering Price/SharePrice/Shares Affiliate
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Forest Oil August 17, 8,000,000 shares $15.44 $169,812.50 / Morgan Stanley &Co.
1999 11,000
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Insight July 19, 20,500,000 shares $24.50 $90,650.00 / Morgan Stanley &Co.
Communications 1999 3,700
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Devon Energy September 8,700,000 $40.50 $170,100.00 / Morgan Stanley &Co.
22, 1999 4,200
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Net Two Phone July 29, 4,800,000 $15.00 $1,500.00 / 100 Morgan Stanley &Co.
1999
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Genentech July 20, 20,000,000 $97.00 $116,400.00 / Morgan Stanley &Co.
1999 1,200
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
Fairchild August 3, 20,000,000 $18.50 116,550.00 / Morgan Stanley &Co.
Semiconductor 1999 6,300
- ------------------ ------------- ----------------------------- ---------- ------------------ --------------------
MassMutual Small Cap Growth Equity Fund (3rd Quarter, 1999)
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Issuer Date of Total Offering Offering Purchase Underwriter Broker from
Offering Price/SharePrice/Shares Affiliate whom shares
purchased
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Foundry Networks September $125,000,000 $25.00 $15,625.00 / 625 JP Morgan Deutsche
27, 1999 Securities Morgan
Grenfell
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
Foundry Networks September $125,000,000 $25.00 $17,500.00 / 700 JP Morgan & Co. Deutsche
28, 1999 Banc
Securities
- ------------------ ------------- ----------------------------- ---------- ------------------ -------------------- --------------
</TABLE>
