<PAGE> PAGE 1
000 B000000 06/30/95
000 C000000 0000867969
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MFS INSTITUTIONAL TRUST
001 B000000 811-6174
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 2
007 C010100 1
007 C020100 MFS WORLDWIDE FIXED INCOME FUND
007 C030100 N
007 C010200 2
007 C020200 MFS EMERGING EQUITIES FUND
007 C030200 N
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
011 A00AA01 MFS FUND DISTRIBUTORS, INC
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
<PAGE> PAGE 2
012 C03AA01 02116
013 A00AA01 DELOITTE & TOUCHE
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
015 A00AA01 STATE STREET BANK AND TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02110
015 E01AA01 X
015 A00AA02 CHASE MANHATTAN BANK, N.A.
015 B00AA02 S
015 C01AA02 NEW YORK
015 C02AA02 NY
015 C03AA02 10081
015 E04AA02 X
018 00AA00 Y
019 A00AA00 N
019 B00AA00 0
020 A000001 MORGAN STANLEY
020 B000001 13-2655998
020 C000001 14
020 A000002 WEEDEN & COMPANY
020 B000002 04-2579802
020 C000002 12
020 A000003 INSTINET CORP.
020 B000003 13-3443395
020 C000003 12
020 A000004 MONTGOMERY SECURITIES
020 B000004 94-1701676
020 C000004 10
020 A000005 CS FIRST BOSTON CORP.
020 B000005 13-5659485
020 C000005 8
020 A000006 DONALDSON LUFKIN SECURITIES
020 B000006 13-2741729
020 C000006 7
020 A000007 OPPENHEIMER & COMPANY
020 B000007 13-2798343
020 C000007 7
020 A000008 DUNLEVY & COMPANY
020 B000008 13-2919975
020 C000008 7
020 A000009 SALOMON BROTHERS INC.
020 B000009 13-3082694
020 C000009 6
020 A000010 PAINEWEBBER INCORPORATED
020 B000010 13-2638166
020 C000010 5
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<PAGE> PAGE 3
022 A000001 LEHMAN BROTHERS
022 B000001 13-2518466
022 C000001 376996
022 D000001 20401
022 A000002 PRUDENTIAL SECURITIES
022 B000002 22-2347336
022 C000002 182073
022 D000002 27406
022 A000003 GOLDMAN SACHS & COMPANY
022 B000003 13-5108880
022 C000003 148265
022 D000003 20039
022 A000004 CS FIRST BOSTON
022 B000004 13-5659485
022 C000004 141975
022 D000004 13986
022 A000005 BANK OF AMERICA
022 B000005 94-1687665
022 C000005 113588
022 D000005 0
022 A000006 CHEMICAL BANK
022 B000006 13-4994650
022 C000006 78095
022 D000006 2016
022 A000007 FORD MOTOR CREDIT
022 B000007 38-1612444
022 C000007 66956
022 D000007 0
022 A000008 NATIONSBANK
022 B000008 75-0520130
022 C000008 42872
022 D000008 0
022 A000009 HONG KONG SHANGHAI BANK
022 B000009 00-0000000
022 C000009 37417
022 D000009 0
022 A000010 J.P. MORGAN SECURITIES
022 B000010 13-3224016
022 C000010 26097
022 D000010 9304
023 C000000 1367480
023 D000000 179501
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<PAGE> PAGE 4
027 000000 Y
029 00AA00 N
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<PAGE> PAGE 5
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
058 A00AA00 N
059 00AA00 Y
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077 A000000 Y
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080 A00AA00 NATIONAL UNION INSURANCE CO.
080 B00AA00 ICI MUTUAL
080 C00AA00 40000
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081 B00AA00 75
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083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
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086 A02AA00 0
086 B01AA00 0
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<PAGE> PAGE 6
086 D02AA00 0
086 E01AA00 0
086 E02AA00 0
086 F01AA00 0
086 F02AA00 0
024 000100 N
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<PAGE> PAGE 7
062 F000100 0.0
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070 E020100 Y
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070 F020100 N
070 G010100 Y
070 G020100 Y
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070 I010100 N
070 I020100 N
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070 J020100 N
070 K010100 Y
070 K020100 N
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070 L020100 Y
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<PAGE> PAGE 8
070 P010100 Y
070 P020100 N
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<PAGE> PAGE 9
074 E000100 0
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<PAGE> PAGE 10
028 F020200 0
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<PAGE> PAGE 11
070 B020200 N
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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SIGNATURE JAMES O. YOST
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS WORLDWIDE
FIXED INCOME FUND AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FIANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>01
<NAME> MFS WORLDWIDE FIXED INCOME FUND
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> JUN-30-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 74,760,118
<INVESTMENTS-AT-VALUE> 76,201,420
<RECEIVABLES> 4,618,578
<ASSETS-OTHER> 4,241
<OTHER-ITEMS-ASSETS> 66,308
<TOTAL-ASSETS> 80,890,547
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,812,267
<TOTAL-LIABILITIES> 4,812,267
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 73,488,154
<SHARES-COMMON-STOCK> 7,508,732
<SHARES-COMMON-PRIOR> 4,393,102
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 112,014
<ACCUMULATED-NET-GAINS> 2,149,194
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 552,946
<NET-ASSETS> (76,078,280)
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,885,884
<OTHER-INCOME> 0
<EXPENSES-NET> 377,771
<NET-INVESTMENT-INCOME> (3,508,113)
<REALIZED-GAINS-CURRENT> 2,407,671
<APPREC-INCREASE-CURRENT> (195,007)
<NET-CHANGE-FROM-OPS> 5,720,777
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,092,709)
<DISTRIBUTIONS-OF-GAINS> (2,993,073)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,994,435
<NUMBER-OF-SHARES-REDEEMED> 214,803
<SHARES-REINVESTED> 335,998
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<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 382,190
<OVERDISTRIB-NII-PRIOR> 1,701,501
<OVERDIST-NET-GAINS-PRIOR> 0
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS EMERGING
EQUITIES FUND AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FIANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>02
<NAME> MFS EMERGING EQUITIES FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JUN-30-1995
<PERIOD-END> JUN-30-1995
<INVESTMENTS-AT-COST> 93,599,640
<INVESTMENTS-AT-VALUE> 109,435,077
<RECEIVABLES> 3,504,268
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<OTHER-ITEMS-ASSETS> 66,869
<TOTAL-ASSETS> 113,011,187
<PAYABLE-FOR-SECURITIES> 1,130,748
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,861,156
<TOTAL-LIABILITIES> 5,991,904
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 84,799,305
<SHARES-COMMON-STOCK> 6,516,769
<SHARES-COMMON-PRIOR> 2,345,998
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,384,541
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 15,835,437
<NET-ASSETS> (107,019,283)
<DIVIDEND-INCOME> 114,573
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<OTHER-INCOME> 0
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<NET-INVESTMENT-INCOME> 137,307
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<DISTRIBUTIONS-OF-GAINS> (1,742,406)
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<SHARES-REINVESTED> 123,788
<NET-CHANGE-IN-ASSETS> 79,460,122
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1,037,449
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (1,037,449)
<GROSS-ADVISORY-FEES> 540,536
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 709,162
<AVERAGE-NET-ASSETS> 72,085,841
<PER-SHARE-NAV-BEGIN> 11.75
<PER-SHARE-NII> (0.03)
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<PER-SHARE-NAV-END> 16.42
<EXPENSE-RATIO> 0.75
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<AVG-DEBT-PER-SHARE> 0
</TABLE>
