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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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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 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 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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010 C030801 01111
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010 B000802 85-720
010 C010802 BOSTON
010 C020802 MA
010 C030802 02116
015 A000801 INVESTORS BANK & TRUST COMPANY
015 B000801 C
015 C010801 BOSTON
015 C020801 MA
<PAGE> PAGE 40
015 C030801 02116
015 E010801 X
024 000800 Y
025 A000801 MORGAN STANLEY & CO. INCORPORATED
025 B000801 13-2655998
025 C000801 E
025 D000801 154
025 D000802 0
025 D000803 0
025 D000804 0
025 D000805 0
025 D000806 0
025 D000807 0
025 D000808 0
028 A010800 0
028 A020800 0
028 A030800 0
028 A040800 0
028 B010800 0
028 B020800 0
028 B030800 0
028 B040800 0
028 C010800 0
028 C020800 0
028 C030800 0
028 C040800 0
028 D010800 0
028 D020800 0
028 D030800 0
028 D040800 0
028 E010800 25075
028 E020800 0
028 E030800 0
028 E040800 0
028 F010800 341
028 F020800 0
028 F030800 0
028 F040800 27
028 G010800 25416
028 G020800 0
028 G030800 0
028 G040800 27
028 H000800 0
045 000800 Y
046 000800 N
047 000800 Y
048 000800 0.000
048 A010800 300000
048 A020800 0.800
048 B010800 300000
048 B020800 0.770
<PAGE> PAGE 41
048 C010800 300000
048 C020800 0.750
048 D010800 600000
048 D020800 0.370
048 E010800 0
048 E020800 0.000
048 F010800 0
048 F020800 0.000
048 G010800 0
048 G020800 0.000
048 H010800 0
048 H020800 0.000
048 I010800 0
048 I020800 0.000
048 J010800 0
048 J020800 0.000
048 K010800 1500000
048 K020800 0.250
049 000800 N
050 000800 N
051 000800 N
052 000800 N
053 A000800 Y
053 B000800 Y
053 C000800 N
055 A000800 N
055 B000800 N
056 000800 Y
057 000800 N
058 A000800 N
059 000800 Y
060 A000800 Y
060 B000800 Y
061 000800 0
062 A000800 N
062 B000800 0.0
062 C000800 0.0
062 D000800 0.0
062 E000800 0.0
062 F000800 0.0
062 G000800 0.0
062 H000800 0.0
062 I000800 0.0
062 J000800 0.0
062 K000800 0.0
062 L000800 0.0
062 M000800 0.0
062 N000800 0.0
062 O000800 0.0
062 P000800 0.0
062 Q000800 0.0
<PAGE> PAGE 42
062 R000800 0.0
063 A000800 0
063 B000800 0.0
066 A000800 Y
066 B000800 N
066 C000800 N
066 D000800 Y
066 E000800 N
066 F000800 N
066 G000800 N
067 000800 N
068 A000800 N
068 B000800 N
069 000800 N
070 A010800 Y
070 A020800 Y
070 B010800 Y
070 B020800 N
070 C010800 Y
070 C020800 N
070 D010800 Y
070 D020800 N
070 E010800 Y
070 E020800 N
070 F010800 N
070 F020800 N
070 G010800 Y
070 G020800 N
070 H010800 Y
070 H020800 N
070 I010800 N
070 I020800 N
070 J010800 Y
070 J020800 N
070 K010800 Y
070 K020800 N
070 L010800 Y
070 L020800 N
070 M010800 Y
070 M020800 N
070 N010800 Y
070 N020800 N
070 O010800 Y
070 O020800 N
070 P010800 N
070 P020800 N
070 Q010800 N
070 Q020800 N
070 R010800 N
070 R020800 N
071 A000800 29866
<PAGE> PAGE 43
071 B000800 5736
071 C000800 24576
071 D000800 23
072 A000800 2
072 B000800 30
072 C000800 20
072 D000800 0
072 E000800 0
072 F000800 33
072 G000800 0
072 H000800 0
072 I000800 0
072 J000800 1
072 K000800 0
072 L000800 0
072 M000800 2
072 N000800 0
072 O000800 0
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072 Q000800 0
072 R000800 5
072 S000800 1
072 T000800 0
072 U000800 0
072 V000800 0
072 W000800 0
072 X000800 42
072 Y000800 5
072 Z000800 13
072AA000800 0
072BB000800 288
072CC010800 1931
072CC020800 0
072DD010800 0
072DD020800 0
072EE000800 0
073 A010800 0.0000
073 A020800 0.0000
073 B000800 0.0000
073 C000800 0.0000
074 A000800 1211
074 B000800 0
074 C000800 0
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074 E000800 0
074 F000800 25493
074 G000800 0
074 H000800 0
074 I000800 0
074 J000800 812
074 K000800 5
<PAGE> PAGE 44
074 L000800 14
074 M000800 0
074 N000800 27535
074 O000800 448
074 P000800 33
074 Q000800 0
074 R010800 0
074 R020800 0
074 R030800 0
074 R040800 9
074 S000800 0
074 T000800 27045
074 U010800 2538
074 U020800 0
074 V010800 10.65
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074 W000800 0.0000
074 X000800 2
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075 B000800 25351
076 000800 0.00
SIGNATURE MARK B. ACKERMAN
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 1
<NAME> MML EQUITY FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 1,911,576,004
<INVESTMENTS-AT-VALUE> 3,284,993,571
<RECEIVABLES> 22,918,439
<ASSETS-OTHER> 10,384
<OTHER-ITEMS-ASSETS> 748
<TOTAL-ASSETS> 3,307,923,142
<PAYABLE-FOR-SECURITIES> 29,872,618
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3,698,204
<TOTAL-LIABILITIES> 33,570,822
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,852,318,299
<SHARES-COMMON-STOCK> 77,743,289
<SHARES-COMMON-PRIOR> 74,956,036
<ACCUMULATED-NII-CURRENT> 28,177,256
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 20,439,198
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,373,417,567
<NET-ASSETS> 3,274,352,320
<DIVIDEND-INCOME> 30,605,888
<INTEREST-INCOME> 3,117,894
<OTHER-INCOME> 0
<EXPENSES-NET> 5,528,633
<NET-INVESTMENT-INCOME> 28,195,149
<REALIZED-GAINS-CURRENT> 20,126,731
<APPREC-INCREASE-CURRENT> 179,241,868
<NET-CHANGE-FROM-OPS> 227,563,748
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (25,000)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4,809,089
<NUMBER-OF-SHARES-REDEEMED> (3,406,745)
<SHARES-REINVESTED> 1,384,909
<NET-CHANGE-IN-ASSETS> 336,244,856
<ACCUMULATED-NII-PRIOR> 7,107
<ACCUMULATED-GAINS-PRIOR> 312,467
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,495,748
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 5,528,633
<AVERAGE-NET-ASSETS> 3,080,139,225
<PER-SHARE-NAV-BEGIN> 39.198
<PER-SHARE-NII> 0.363
<PER-SHARE-GAIN-APPREC> 2.557
<PER-SHARE-DIVIDEND> (0.001)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 42.117
<EXPENSE-RATIO> 0.18
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 2
<NAME> MML MONEY MARKET FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 184,472,931
<INVESTMENTS-AT-VALUE> 184,472,931
<RECEIVABLES> 4,559,101
<ASSETS-OTHER> 4,233
<OTHER-ITEMS-ASSETS> 2,653
<TOTAL-ASSETS> 189,038,918
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,524,781
<TOTAL-LIABILITIES> 5,524,781
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 183,512,047
<SHARES-COMMON-STOCK> 183,514,137
<SHARES-COMMON-PRIOR> 178,433,757
<ACCUMULATED-NII-CURRENT> 14,087
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (11,997)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 183,514,137
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4,514,358
<OTHER-INCOME> 0
<EXPENSES-NET> 450,461
<NET-INVESTMENT-INCOME> 4,063,897
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 4,063,897
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,063,897)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 82,307,396
<NUMBER-OF-SHARES-REDEEMED> (81,250,410)
<SHARES-REINVESTED> 4,023,394
<NET-CHANGE-IN-ASSETS> 5,080,380
<ACCUMULATED-NII-PRIOR> 14,087
<ACCUMULATED-GAINS-PRIOR> (11,997)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 423,528
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 450,461
<AVERAGE-NET-ASSETS> 182,301,638
<PER-SHARE-NAV-BEGIN> 1.000
<PER-SHARE-NII> 0.022
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (0.022)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.000
<EXPENSE-RATIO> 0.25
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 3
<NAME> MML MANAGED BOND INVESTMENT FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 260,676,704
<INVESTMENTS-AT-VALUE> 257,534,469
<RECEIVABLES> 6,983,741
<ASSETS-OTHER> 7,041
<OTHER-ITEMS-ASSETS> 2,550
<TOTAL-ASSETS> 264,527,801
<PAYABLE-FOR-SECURITIES> 3,930,692
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 734,871
<TOTAL-LIABILITIES> 4,665,563
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 259,638,517
<SHARES-COMMON-STOCK> 21,356,178
<SHARES-COMMON-PRIOR> 20,173,153
<ACCUMULATED-NII-CURRENT> 4,113,926
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (747,970)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3,142,235)
<NET-ASSETS> 259,862,238
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 8,480,318
<OTHER-INCOME> 0
<EXPENSES-NET> 628,817
<NET-INVESTMENT-INCOME> 7,851,501
<REALIZED-GAINS-CURRENT> (747,970)
<APPREC-INCREASE-CURRENT> (12,255,979)
<NET-CHANGE-FROM-OPS> (5,152,448)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,857,605)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,627,611
<NUMBER-OF-SHARES-REDEEMED> (1,757,599)
<SHARES-REINVESTED> 313,013
<NET-CHANGE-IN-ASSETS> 5,753,558
<ACCUMULATED-NII-PRIOR> 120,030
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 602,646
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 628,817
<AVERAGE-NET-ASSETS> 259,852,865
<PER-SHARE-NAV-BEGIN> 12.596
<PER-SHARE-NII> 0.381
<PER-SHARE-GAIN-APPREC> (0.624)
<PER-SHARE-DIVIDEND> (0.185)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.168
<EXPENSE-RATIO> 0.24
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 4
<NAME> MML BLEND FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 2,135,671,514
<INVESTMENTS-AT-VALUE> 3,046,455,383
<RECEIVABLES> 22,069,359
<ASSETS-OTHER> 4,870
<OTHER-ITEMS-ASSETS> 71
<TOTAL-ASSETS> 3,068,529,683
<PAYABLE-FOR-SECURITIES> 18,639,326
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,114,497
<TOTAL-LIABILITIES> 22,753,823
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2,085,368,831
<SHARES-COMMON-STOCK> 117,065,458
<SHARES-COMMON-PRIOR> 112,214,264
<ACCUMULATED-NII-CURRENT> 24,280,545
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 25,342,615
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 910,783,869
<NET-ASSETS> 3,045,775,860
<DIVIDEND-INCOME> 17,841,765
<INTEREST-INCOME> 36,269,167
<OTHER-INCOME> 0
<EXPENSES-NET> 5,377,166
<NET-INVESTMENT-INCOME> 48,733,766
<REALIZED-GAINS-CURRENT> 25,148,626
<APPREC-INCREASE-CURRENT> 60,722,747
<NET-CHANGE-FROM-OPS> 134,605,139
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (24,535,406)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,106,403
<NUMBER-OF-SHARES-REDEEMED> (5,199,252)
<SHARES-REINVESTED> 1,944,043
<NET-CHANGE-IN-ASSETS> 231,086,950
<ACCUMULATED-NII-PRIOR> 82,185
<ACCUMULATED-GAINS-PRIOR> 193,989
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,342,670
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 5,377,166
<AVERAGE-NET-ASSETS> 2,950,651,373
<PER-SHARE-NAV-BEGIN> 25.083
<PER-SHARE-NII> 0.417
<PER-SHARE-GAIN-APPREC> 0.726
<PER-SHARE-DIVIDEND> (0.208)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 26.018
<EXPENSE-RATIO> 0.18
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD
ENDED JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 5
<NAME> MML EQUITY INDEX FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 32,408,609
<INVESTMENTS-AT-VALUE> 47,614,738
<RECEIVABLES> 330,181
<ASSETS-OTHER> 1,153,884
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 49,098,803
<PAYABLE-FOR-SECURITIES> 1,421,701
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 88,339
<TOTAL-LIABILITIES> 1,510,040
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 31,937,216
<SHARES-COMMON-STOCK> 2,785,685
<SHARES-COMMON-PRIOR> 2,363,757
<ACCUMULATED-NII-CURRENT> 178,978
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 245,106
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 15,227,463
<NET-ASSETS> 47,588,763
<DIVIDEND-INCOME> 267,227
<INTEREST-INCOME> 23,804
<OTHER-INCOME> 0
<EXPENSES-NET> 112,735
<NET-INVESTMENT-INCOME> 178,296
<REALIZED-GAINS-CURRENT> 222,436
<APPREC-INCREASE-CURRENT> 4,224,243
<NET-CHANGE-FROM-OPS> 4,624,975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 611,070
<NUMBER-OF-SHARES-REDEEMED> (189,142)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 11,519,486
<ACCUMULATED-NII-PRIOR> 682
<ACCUMULATED-GAINS-PRIOR> 22,670
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 81,337
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 112,735
<AVERAGE-NET-ASSETS> 40,201,912
<PER-SHARE-NAV-BEGIN> 15.260
<PER-SHARE-NII> 0.064
<PER-SHARE-GAIN-APPREC> 1.756
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 17.080
<EXPENSE-RATIO> 0.27
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 6
<NAME> MML SMALL CAP VALUE EQUITY FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 12,454,484
<INVESTMENTS-AT-VALUE> 12,701,527
<RECEIVABLES> 125,511
<ASSETS-OTHER> 2,108,539
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 14,935,577
<PAYABLE-FOR-SECURITIES> 257,322
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 41,553
<TOTAL-LIABILITIES> 298,875
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 15,352,675
<SHARES-COMMON-STOCK> 1,664,189
<SHARES-COMMON-PRIOR> 1,229,502
<ACCUMULATED-NII-CURRENT> 52,856
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,015,872)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 247,043
<NET-ASSETS> 14,636,702
<DIVIDEND-INCOME> 59,474
<INTEREST-INCOME> 38,338
<OTHER-INCOME> 0
<EXPENSES-NET> 44,042
<NET-INVESTMENT-INCOME> 53,770
<REALIZED-GAINS-CURRENT> (739,528)
<APPREC-INCREASE-CURRENT> 1,366,478
<NET-CHANGE-FROM-OPS> 680,720
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 486,306
<NUMBER-OF-SHARES-REDEEMED> (56,028)
<SHARES-REINVESTED> 4,409
<NET-CHANGE-IN-ASSETS> 4,194,518
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (276,344)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 34,115
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 74,311
<AVERAGE-NET-ASSETS> 11,565,855
<PER-SHARE-NAV-BEGIN> 8.493
<PER-SHARE-NII> 0.033
<PER-SHARE-GAIN-APPREC> 0.269
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.795
<EXPENSE-RATIO> 0.38
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 7
<NAME> MML SMALL CAP GROWTH EQUITY FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 19,432,533
<INVESTMENTS-AT-VALUE> 21,543,722
<RECEIVABLES> 429,956
<ASSETS-OTHER> 6,090,171
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 28,063,849
<PAYABLE-FOR-SECURITIES> 555,311
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 54,045
<TOTAL-LIABILITIES> 609,356
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 25,143,710
<SHARES-COMMON-STOCK> 2,513,762
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 18,839
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 180,755
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,111,189
<NET-ASSETS> 27,454,493
<DIVIDEND-INCOME> 11,741
<INTEREST-INCOME> 56,035
<OTHER-INCOME> 0
<EXPENSES-NET> 48,937
<NET-INVESTMENT-INCOME> 18,839
<REALIZED-GAINS-CURRENT> 180,755
<APPREC-INCREASE-CURRENT> 2,111,189
<NET-CHANGE-FROM-OPS> 2,310,783
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,153,889
<NUMBER-OF-SHARES-REDEEMED> (127)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 27,454,493
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 44,311
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 54,184
<AVERAGE-NET-ASSETS> 25,499,096
<PER-SHARE-NAV-BEGIN> 10.000
<PER-SHARE-NII> 0.007
<PER-SHARE-GAIN-APPREC> 0.913
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.920
<EXPENSE-RATIO> 0.19
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REPORT TO SHAREHOLDERS OF MML SERIES INVESTMENT FUND FOR THE PERIOD ENDED
JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
<NUMBER> 8
<NAME> MML GROWTH EQUITY FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 23,562,612
<INVESTMENTS-AT-VALUE> 25,493,455
<RECEIVABLES> 831,091
<ASSETS-OTHER> 1,210,730
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 27,535,276
<PAYABLE-FOR-SECURITIES> 448,045
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 42,668
<TOTAL-LIABILITIES> 490,713
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 25,388,751
<SHARES-COMMON-STOCK> 2,538,447
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 12,897
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (287,928)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,930,843
<NET-ASSETS> 27,044,563
<DIVIDEND-INCOME> 19,940
<INTEREST-INCOME> 30,248
<OTHER-INCOME> 0
<EXPENSES-NET> 37,291
<NET-INVESTMENT-INCOME> 12,897
<REALIZED-GAINS-CURRENT> (287,928)
<APPREC-INCREASE-CURRENT> 1,930,843
<NET-CHANGE-FROM-OPS> 1,655,812
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,541,150
<NUMBER-OF-SHARES-REDEEMED> (2,703)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 27,044,563
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 32,783
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 42,656
<AVERAGE-NET-ASSETS> 25,351,182
<PER-SHARE-NAV-BEGIN> 10.000
<PER-SHARE-NII> 0.005
<PER-SHARE-GAIN-APPREC> 0.645
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.650
<EXPENSE-RATIO> 0.15
</TABLE>
EXHIBIT INDEX TO FORM N-SAR
OF MML SERIES INVESTMENT FUND
FOR THE PERIOD ENDED JUNE 30, 1999
Exhibit No. Description
77C Submission of matters to a vote of security holders
77K Changes in Registrant's certifying accountant
77Q1(e) Investment Management Agreements dated May 3, 1999 between
Massachusetts Mutual Life Insurance Company and MML Series
Investment Fund on behalf of each of MML Equity Fund, MML Money
Market Fund, MML Blend Fund, MML Equity Index Fund, MML Small
Cap Value Equity Fund, MML Small Cap Growth Equity Fund and MML
Growth Equity Fund.
Investment Sub-Advisory Agreement effective as of May 3, 1999,
between Massachusetts Mutual Life Insurance Company and
Massachusetts Financial Services Company regarding MML Growth
Equity Fund.
Investment Sub-Advisory Agreement effective as of May 3, 1999,
between Massachusetts Mutual Life Insurance Company and
J.P. Morgan Investment Management Inc. regarding MML Small
Cap Growth Equity Fund.
Investment Sub-Advisory Agreement effective as of May 3, 1999,
between Massachusetts Mutual Life Insurance Company and
Waddell & Reed Investment Management Company regarding MML Small
Cap Growth Equity Fund.
77Q1(f) Letter from independent accountant furnished pursuant to
sub-item 77K
For Period Ended 06/30/99
File No. 811-2224
77C Submission of matters to a vote of security holders
A Special Meeting of Shareholders of Registrant was held on April 2, 1999.
The meeting was adjourned and reconvened on Friday, April 23. Massachusetts
Mutual Life Insurance Company ("MassMutual"), MML Bay State Life Insurance
Company ("MML Bay State") and C.M. Life Insurance Company ("C.M. Life")
own of record all of the outstanding shares of the Trust. However, the
owners of variable life insurance policies variable annuity contracts that
depend on the investment performance of certain separate accounts of
MassMutual, MML Bay State and C.M. Life have the right to instruct
MassMutual, MML Bay State and C.M. Life on how to vote.
The proposals set forth in the proxy materials sent to contract holders
included (1) the election of five Trustees, (2) approval of amendments to the
Investment Management Agreements to require the Funds to assume certain
expenses currently paid by MassMutual, as investment manager; (3) approval of
changes in the fundamental investment policies of the Trust to permit MML
Blend Fund to engage in dollar roll transactions; and (4) approval of changes
in the fundamental investment policies of the Trust to permit MML Blend Fund,
MML Equity Fund and MML Equity Index Fund to engage in the lending of
portfolio securities with respect to not more than 33% of the total assets of
each such Fund. All of the proposals brought before the shareholders at the
Special Meeting were approved by the shareholders.
The number of votes present by proxy were:
Variable Life/ Shares Represented Percentage of Total
Annuity Units at Meeting Record Date Shares
MML Equity 61,208,821.093 78,609,470.526 99.998%
Fund
MML Money
Market Fund 23,561,179.210 174,366,775.630 99.634%
MML Managed
Bond Fund 21,677,702.847 20,703,842.304 99.997%
MML Blend 54,275,120.535 118,822,538.751 100.00%
Fund
MML Indexed
Equity Fund 4,112,851.650 2,403,145.032 99.925%
MML Small Cap
Value Equity
Fund 413,732.554 1,297,372.494 99.980%
Proposal 1 -- Election of Trustees:
Nominees MML MML MML MML MML MML
For Board Equity Money Managed Blend Equity Small Cap
Of Trustees Fund Market Bond Fund Index Value
Fund Fund Fund Equity
Fund
Richard H. For: 95.873% 98.792% 96.814% 95.611% 99.094% 99.224%
Ayers Against: 4.127% 1.208% 3.186% 4.389% 0.906% 0.756%
David E.A. For: 95.922% 98.794% 96.823% 99.650% 99.094% 99.224%
Carson Against: 4.078% 1.206% 3.177% 4.350% 0.906% 0.756%
Richard W. For: 95.917% 98.794% 96.825% 95.645% 99.094% 99.224%
Greene Against: 4.083% 1.206% 3.175% 4.355% 0.906% 0.756%
Beverly L. For: 95.918% 98.784% 96.815% 95.673% 99.094% 99.224%
Hamilton Against 4.082% 1.216% 3.185% 4.327% 0.906% 0.756%
William F. For: 95.914% 98.794% 96.819% 95.642% 99.094% 99.224%
Marshall, Against: 4.086% 1.206% 3.181% 4.358% 0.906% 0.756%
Jr.
As of May 3, 1999, the following persons are also Trustees of the Trust:
Stuart H. Reese, Ronald J. Abdow, Mary Boland, Richard G. Dooley, Charles J.
McCarthy, Robert J. O'Connell and John H. Southworth.
Proposal 2 - Amendment to Investment Management Agreements for MML Equity
Fund, MML Money Market Fund, MML Blend Fund, MML Equity Index Fund and MML
Small Cap Value Equity Fund.
MML Equity MML Money MML Blend MML Equity MML Small Cap
Fund Market Fund Index Fund Value Equity
Fund Fund
For: 79.787% 91.560% 81.540% 59.057% 95.893%
Against: 14.465% 5.650% 12.702% 32.695% 1.059%
Abstain: 5.745% 2.789% 5.759% 8.247% 3.049%
>
Proposal 3 - Approval of Changes in the fundamental investment policies of
the Trust to permit MML Blend Fund to engage in dollar roll transactions.
The results were as follows: 85.830% voted in favor of the proposal, 8.071%
voted against the proposal; and 6.099% abstained.
Proposal 4 - Approval changes to the fundamental investment policies of the
Trust to permit MML Blend Fund, MML Equity Fund and MML Equity Index Fund to
engage in the lending of portfolio securities with respect to not more than
33% of the total assets of each such Fund.
MML Equity Fund MML Blend Fund MML Equity Index Fund
83.690% For 83.439% For 84.914% For
10.419% Against 10.504% Against 7.355% Against
5.892% Abstain 6.058% Abstain 7.731% Abstain
For Period Ended 06/30/99
File No. 811-2224
77K Changes in Registrant's certifying accountant
Registrant's Board of Trustees has dismissed PricewaterhouseCoopers LLP
("PwC") as its principal accountant, effective July 22, 1999. Registrant's
Audit Committee recommended engaging Deloitte & Touche LLP as the principal
accountant to audit the Registrant's financial statements for the fiscal year
ending December 31, 1999. At a special meeting on March 26, 1999, a majority
of Registrant's Board of Trustees, including a majority of the independent
Trustees, approved the appointment of Deloitte & Touche LLP as Registrant's
independent auditors subject to the right of Registrant, by a majority vote
of the shareholders at any meeting called for that purpose, to terminate the
appointment without penalty. The appointment of Deloitte & Touche LLP was
subject to certain conditions, the last of which was met on July 22, 1999.
PwC's report on the financial statements for the fiscal years 1997 and 1998
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.
For fiscal years 1997 and 1998, and during the period prior to PwC's
dismissal, Registrant and PwC have not had any disagreements on any matter of
accounting principles or practices, financial statement disclosures, or
auditing scope or procedure, that either (1) have not been resolved to PwC's
satisfaction and (2) or, if not resolved to PwC's satisfaction, would have
caused it to make a reference to the subject matter of the disagreement in
connection with its report.
Registrant discloses that no "reportable events" as defined in Item
304(a)(v) existed for fiscal years 1997 and 1998 and during the period prior
to Deloitte & Touche LLP's appointment, specifically:
PwC did not advise Registrant that the internal controls necessary for
Registrant to develop financial statements do not exist;
PwC did not advise Registrant that it can no longer rely on management's
representations, or that it was unwilling to be associated with the
financial statements prepared by management;
PwC did not advise Registrant of the need to expand significantly the scope
of its audit;
PwC did not advise Registrant that information had come to its attention
that would materially impact the fairness or reliability of either (i) a
previously issued audit report of the underlying financial statements, or
(ii) the financial statements issued or to be issued covering fiscal year
1998.
Registrant has not consulted Deloitte & Touche LLP on any accounting matters
prior to its engagement.
Pursuant to the requirements of Item 304(a)(3), Registrant has provided a
copy of this Item 77K to PwC. PwC has furnished Registrant with a letter
addressed to the SEC stating that it agrees with the statements made by
Registrant herein. A copy of such letter from PwC is attached hereto as an
exhibit.
For Period Ended 06/30/99
File No. 811-2224
77Q(1)(e) Form of Investment Management Agreement dated May 3, 1999 between
Massachusetts Mutual Life Insurance Company and MML Series
Investment Fund on behalf of each of MML Equity Fund, MML Money
Market Fund, MML Blend Fund, MML Equity Index Fund, MML Small
Cap Value Equity Fund, MML Small Cap Growth Equity Fund and MML
Growth Equity Fund was filed as Exhibit No. D(2) to Post-
Effective Amendment No. 42 to Registrant's Registration Statement
on Form N-1A (as filed with the Securities and Exchange Commission
("SEC") via EDGAR), and is incorporated herein by reference.
Investment Sub-Advisory Agreement effective as of May 3, 1999,
between Massachusetts Mutual Life Insurance Company and
Massachusetts Financial Services Company regarding MML Growth
Equity Fund was filed as Exhibit No. D(7) to Post-Effective
Amendment No. 42 to Registrant's Registration Statement on
Form N-1A (as filed with the SEC via EDGAR), and is incorporated
herein by reference.
Investment Sub-Advisory Agreement effective as of May 3, 1999,
between Massachusetts Mutual Life Insurance Company and
J.P. Morgan Investment Management Inc. regarding MML Small Cap
Growth Equity Fund was filed as Exhibit No. D(8) to Post-
Effective Amendment No. 42 to Registrant's Registration Statement
on Form N-1A (as filed with the SEC via EDGAR), and is
incorporated herein by reference.
Investment Sub-Advisory Agreement effective as of May 3, 1999,
between Massachusetts Mutual Life Insurance Company and
Waddell & Reed Investment Management Company regarding MML Small
Cap Growth Equity Fund was filed as Exhibit No. D(9) to Post-
Effective Amendment No. 42 to Registrant's Registration Statement
on Form N-1A (as filed with the SEC via EDGAR), and is
incorporated herein by reference.
For Period Ended 06/30/99
File No. 811-2224)
Item 77Q1(f) Letter from independent accountants furnished pursuant to sub-
item 77K
[PRICEWATERHOUSECOOPERS LETTERHEAD]
August 11, 1999
Securities and Exchange Commission
450 Fifth Street, NW
Washington, DC 20549
RE: MML SERIES INVESTMENT FUND (1933 Act File No. 2-39334,
1940 Act File No. 811-2224)
Commissioners:
We have read the statements made by MML Series Investment Fund
("Registrant") (copy attached), which we understand will be filed with the
Commission, pursuant to Item 77K of Form N-SAR for the semi-annual period
ended June 30, 1999. We agree with the statements concerning our Firm in
such Form N-SAR.
Very truly yours,
PricewaterhouseCoopers LLP
