MML SERIES INVESTMENT FUND
NSAR-A, 1996-08-26
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<PAGE>      PAGE  1
000 A000000 06/30/96
000 C000000 0000067160
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 MML SERIES INVESTMENT FUND
001 B000000 811-2224
001 C000000 4137888411
002 A000000 1295 STATE STREET
002 B000000 SPRINGFIELD
002 C000000 MA
002 D010000 01111
002 D020000 0001
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  4
007 C010100  1
007 C020100 MML EQUITY FUND
007 C030100 N
007 C010200  2
007 C020200 MML MONEY MARKET FUND
007 C030200 N
007 C010300  3
007 C020300 MML MANAGED BOND FUND
007 C030300 N
007 C010400  4
007 C020400 MML BLEND FUND
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   27
019 C00AA00 MASSMUTUAL
020 A000001 GOLDMAN SACHS & COMPANY
020 B000001 13-5108880
020 C000001     50
020 A000002 CS FIRST BOSTON CORPORATION
020 B000002 13-5659485
020 C000002     48
<PAGE>      PAGE  2
020 A000003 PRUDENTIAL SECURITIES INCORPORATED
020 B000003 22-2347336
020 C000003     47
020 A000004 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP
020 B000004 13-2741729
020 C000004     37
020 A000005 FACTSET DATA SYSTEMS INC.
020 B000005 13-2953224
020 C000005     35
020 A000006 MORGAN (J.P.) SECURITIES INC.
020 B000006 13-3224016
020 C000006     32
020 A000007 SALOMON BROTHERS INC
020 B000007 13-3082694
020 C000007     29
020 A000008 SCHRODER WERTHEIM & CO. INCORPORATED
020 B000008 13-2697272
020 C000008     27
020 A000009 NATWEST
020 B000009 13-3312778
020 C000009     25
020 A000010 LEHMAN BROTHERS, INC.
020 B000010 13-2518466
020 C000010     24
021  000000      564
022 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH, INC
022 B000001 13-5674085
022 C000001    921146
022 D000001     34186
022 A000002 GOLDMAN SACHS & COMPANY
022 B000002 13-5108880
022 C000002    874647
022 D000002     26201
022 A000003 BA SECURITIES INC.
022 B000003 95-4035346
022 C000003    194551
022 D000003     19238
022 A000004 MORGAN, STANLEY & CO., INCORPORATED
022 B000004 13-2655998
022 C000004    130816
022 D000004     69938
022 A000005 LEHMAN BROTHERS, INC.
022 B000005 13-2518466
022 C000005    198754
022 D000005       189
022 A000006 MORGAN (J.P.) SECURITIES INC.
022 B000006 13-3224016
022 C000006    115255
022 D000006     12715
022 A000007 UBS SECURITIES INC.
022 B000007 13-2932996
<PAGE>      PAGE  3
022 C000007     54414
022 D000007     52744
022 A000008 CS FIRST BOSTON CORPORATION
022 B000008 13-5659485
022 C000008     74179
022 D000008         0
022 A000009 SALOMON BROTHERS INC
022 B000009 13-3082694
022 C000009     46051
022 D000009     16670
022 A000010 PAINEWEBBER INCORPORATED
022 B000010 13-2638166
022 C000010     24109
022 D000010     23953
023 C000000    2856982
023 D000000     289087
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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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024  000200 Y
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025 B000201 13-5108880
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<PAGE>      PAGE  7
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062 A000200 Y
062 B000200   8.8
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062 D000200   0.0
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062 F000200   0.0
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062 H000200   0.0
062 I000200  91.7
062 J000200   0.0
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063 B000200  0.0
064 A000200 N
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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076  000200     0.00
024  000300 N
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
075 A000300        0
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076  000300     0.00
024  000400 Y
025 A000401 AMERICAN EXPRESS COMPANY
025 B000401 13-4922250
025 C000401 E
025 D000401   15440
025 A000402 GOLDMAN SACHS GROUP, L.P.
025 B000402 13-3501777
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<PAGE>      PAGE  13
062 E000400   0.0
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<PAGE>      PAGE  14
073 A010400   0.2000
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SIGNATURE   STEPHEN L. KUHN                              
TITLE       SECRETARY           
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
   <NUMBER> 1
   <NAME> MML EQUITY FUND
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                    1,072,570,399
<INVESTMENTS-AT-VALUE>                   1,524,477,876
<RECEIVABLES>                                5,251,643
<ASSETS-OTHER>                               2,131,267
<OTHER-ITEMS-ASSETS>                                 0
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<PAYABLE-FOR-SECURITIES>                     5,347,640
<SENIOR-LONG-TERM-DEBT>                              0
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<TOTAL-LIABILITIES>                          6,753,190
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,040,001,460
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<SHARES-COMMON-PRIOR>                       48,175,574
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<OVERDISTRIBUTION-NII>                               0
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<OVERDISTRIBUTION-GAINS>                             0
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<NET-ASSETS>                             1,525,107,596
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<OTHER-INCOME>                                       0
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<REALIZED-GAINS-CURRENT>                    14,069,458
<APPREC-INCREASE-CURRENT>                   81,554,753
<NET-CHANGE-FROM-OPS>                      114,244,576
<EQUALIZATION>                                       0
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<PER-SHARE-NAV-BEGIN>                           25,924
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                             28.143
<EXPENSE-RATIO>                                   0.19
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<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-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
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<INVESTMENTS-AT-VALUE>                     121,197,672
<RECEIVABLES>                                        0
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<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
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<TOTAL-LIABILITIES>                            621,138
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   119,375,012
<SHARES-COMMON-STOCK>                      120,580,820
<SHARES-COMMON-PRIOR>                      108,920,201
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<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 298,463
<NET-INVESTMENT-INCOME>                      2,792,647
<REALIZED-GAINS-CURRENT>                         (212)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        2,792,435
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    2,792,435
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     49,324,064
<NUMBER-OF-SHARES-REDEEMED>                 40,931,580
<SHARES-REINVESTED>                          3,268,135
<NET-CHANGE-IN-ASSETS>                      11,660,619
<ACCUMULATED-NII-PRIOR>                          9,734
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          280,866
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                298,463
<AVERAGE-NET-ASSETS>                       114,405,687
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.24
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                              0.24
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   0.26
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
   <NUMBER> 3
   <NAME> MML MANAGEND BOND FUND
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                      165,257,930
<INVESTMENTS-AT-VALUE>                     163,823,780
<RECEIVABLES>                                2,200,766
<ASSETS-OTHER>                                   1,853
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             166,026,399
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      201,377
<TOTAL-LIABILITIES>                            201,377
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   165,610,676
<SHARES-COMMON-STOCK>                       13,783,081
<SHARES-COMMON-PRIOR>                       12,748,690
<ACCUMULATED-NII-CURRENT>                    2,714,866
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (1,204,201)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   (1,434,150)
<NET-ASSETS>                               165,825,022
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            5,716,624
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 409,778
<NET-INVESTMENT-INCOME>                      5,306,846
<REALIZED-GAINS-CURRENT>                     (353,181)
<APPREC-INCREASE-CURRENT>                  (7,864,043)
<NET-CHANGE-FROM-OPS>                      (2,910,378)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    2,593,548
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,317,783
<NUMBER-OF-SHARES-REDEEMED>                    699,744
<SHARES-REINVESTED>                            416,352
<NET-CHANGE-IN-ASSETS>                       7,126,884
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (776,885)
<OVERDISTRIB-NII-PRIOR>                         72,567
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          389,313
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                409,778
<AVERAGE-NET-ASSETS>                       163,238,122
<PER-SHARE-NAV-BEGIN>                           12.448
<PER-SHARE-NII>                                  0.396
<PER-SHARE-GAIN-APPREC>                          0.620
<PER-SHARE-DIVIDEND>                             0.193
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                             12.031
<EXPENSE-RATIO>                                   0.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000067160
<NAME> MML SERIES INVESTMENT FUND
<SERIES>
   <NUMBER> 4
   <NAME> MML BLEND FUND
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<INVESTMENTS-AT-COST>                    1,571,402,481
<INVESTMENTS-AT-VALUE>                   2,010,444,841
<RECEIVABLES>                               11,634,987
<ASSETS-OTHER>                               (587,453)
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,021,492,375
<PAYABLE-FOR-SECURITIES>                     1,886,523
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,842,757
<TOTAL-LIABILITIES>                          3,729,280
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 1,536,766,548
<SHARES-COMMON-STOCK>                       94,053,405
<SHARES-COMMON-PRIOR>                       88,851,472
<ACCUMULATED-NII-CURRENT>                   18,881,505
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     22,022,598
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   439,151,190
<NET-ASSETS>                             2,017,763,095
<DIVIDEND-INCOME>                           14,065,376
<INTEREST-INCOME>                           27,010,792
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               3,658,325
<NET-INVESTMENT-INCOME>                     37,417,843
<REALIZED-GAINS-CURRENT>                    22,723,232
<APPREC-INCREASE-CURRENT>                   45,028,483
<NET-CHANGE-FROM-OPS>                      105,169,558
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   18,540,796
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,841,746
<NUMBER-OF-SHARES-REDEEMED>                  2,114,653
<SHARES-REINVESTED>                          3,474,840
<NET-CHANGE-IN-ASSETS>                     194,622,165
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                        (7,094)
<OVERDIST-NET-GAINS-PRIOR>                   (689,082)
<GROSS-ADVISORY-FEES>                        3,635,657
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,658,325
<AVERAGE-NET-ASSETS>                     1,951,129,277
<PER-SHARE-NAV-BEGIN>                           20.519
<PER-SHARE-NII>                                  0.401
<PER-SHARE-GAIN-APPREC>                          0.733
<PER-SHARE-DIVIDEND>                             0.200
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                             21.453
<EXPENSE-RATIO>                                   0.19
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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