MFS INSTITUTIONAL TRUST
NSAR-A, 1998-02-26
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<PAGE>      PAGE  1
000 A000000 12/31/97
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
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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  7
007 C010100  1
007 C020100 MFS INSTL GLOBAL FIXED INCOME FUND
007 C030100 N
007 C010200  2
007 C020200 MFS INSTL EMERGING EQUITIES FUND
007 C030200 N
007 C010300  3
007 C020300 MFS INSTL EMERGING MARKETS DEBT FUND
007 C030300 N
007 C010400  4
007 C020400 MFS INSTL CORE PLUS FIXED INCOME FUND
007 C030400 N
007 C010500  5
007 C020500 MFS INSTL RESEARCH FUND
007 C030500 N
007 C010600  6
007 C020600 MFS INSTL MID-CAP GROWTH FUND
007 C030600 N
007 C010700  7
007 C020700 MFS INSTL INTERNATIONAL EQUITY FUND
007 C030700 N
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
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008 D01AA01 BOSTON
008 D02AA01 MA
<PAGE>      PAGE  2
008 D03AA01 02116
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B00AA01 801-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 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
012 C03AA01 02116
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 BOSTON
013 B02AA01 MA
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020 A000001 MERRILL LYNCH PIERCE
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020 A000002 WEEDEN & CO.
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020 A000003 MONTGOMERY SECURITIES
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020 A000005 CS FIRST BOSTON CORP.
020 B000005 13-5659485
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020 A000006 DONALDSON, LUFKIN & JENRETTE
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020 A000009 SMITH BARNEY
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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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<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  18
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<PAGE>      PAGE  19
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<PAGE>      PAGE  20
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050  000400 N
051  000400 N
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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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SIGNATURE   JAMES O. YOST                                
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 03
   <NAME> MFS INSTITUTIONAL EMERGING MARKETS DEBT FUND
<MULTIPLIER> 1
       
<S>                             <C>
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<PERIOD-END>                               DEC-31-1997
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<INVESTMENTS-AT-VALUE>                         4882083
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<SHARES-COMMON-STOCK>                           490987
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<OVERDISTRIBUTION-GAINS>                      (237922)
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<INTEREST-INCOME>                               208923
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<EXPENSES-NET>                                 (33138)
<NET-INVESTMENT-INCOME>                         176789
<REALIZED-GAINS-CURRENT>                      (230201)
<APPREC-INCREASE-CURRENT>                        30940
<NET-CHANGE-FROM-OPS>                          (22472)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (175251)
<DISTRIBUTIONS-OF-GAINS>                      (365182)
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<NUMBER-OF-SHARES-SOLD>                           2748
<NUMBER-OF-SHARES-REDEEMED>                     (9427)
<SHARES-REINVESTED>                              51761
<NET-CHANGE-IN-ASSETS>                        (100617)
<ACCUMULATED-NII-PRIOR>                         156936
<ACCUMULATED-GAINS-PRIOR>                       365182
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
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<AVERAGE-NET-ASSETS>                           5260040
<PER-SHARE-NAV-BEGIN>                            11.94
<PER-SHARE-NII>                                   0.40
<PER-SHARE-GAIN-APPREC>                         (0.45)
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<PER-SHARE-DISTRIBUTIONS>                       (0.85)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.64
<EXPENSE-RATIO>                                   1.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 04
   <NAME> MFS INSTITUTIONAL CORE PLUS FIXED INCOME FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                                0
<INVESTMENTS-AT-VALUE>                               0
<RECEIVABLES>                                        0
<ASSETS-OTHER>                                   17600
<OTHER-ITEMS-ASSETS>                               110
<TOTAL-ASSETS>                                   17710
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        17600	
<TOTAL-LIABILITIES>                              17600
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                             0
<SHARES-COMMON-STOCK>                               11
<SHARES-COMMON-PRIOR>                               11
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<OVERDISTRIBUTION-GAINS>                             0
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<DIVIDEND-INCOME>                                    0
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<NET-INVESTMENT-INCOME>                              0
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                                0
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                              0
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
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<PER-SHARE-NAV-BEGIN>                            10.00
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<PER-SHARE-NAV-END>                              10.00
<EXPENSE-RATIO>                                   0.00
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 7
   <NAME> MFS INSTITUTIONAL INTERNATIONAL EQUITY FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         10058055
<INVESTMENTS-AT-VALUE>                        10738074
<RECEIVABLES>                                   129326
<ASSETS-OTHER>                                      26
<OTHER-ITEMS-ASSETS>                              9400
<TOTAL-ASSETS>                                10876826
<PAYABLE-FOR-SECURITIES>                         32882
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        36402
<TOTAL-LIABILITIES>                              69284
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      10085475
<SHARES-COMMON-STOCK>                           885488
<SHARES-COMMON-PRIOR>                           819468
<ACCUMULATED-NII-CURRENT>                        33203
<OVERDISTRIBUTION-NII>                               0
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<NET-INVESTMENT-INCOME>                          33200
<REALIZED-GAINS-CURRENT>                         76173
<APPREC-INCREASE-CURRENT>                     (470640)
<NET-CHANGE-FROM-OPS>                         (361267)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (68852)
<DISTRIBUTIONS-OF-GAINS>                      (292025)
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<NUMBER-OF-SHARES-REDEEMED>                    (21089)
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<EXPENSE-RATIO>                                   0.85
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 6
   <NAME> MFS INSTL MID CAP GROWTH FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         24376053
<INVESTMENTS-AT-VALUE>                        27489830
<RECEIVABLES>                                   212899
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<PAYABLE-FOR-SECURITIES>                         66273
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        14676
<TOTAL-LIABILITIES>                              80949
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      24112594
<SHARES-COMMON-STOCK>                          2150331
<SHARES-COMMON-PRIOR>                          2041255
<ACCUMULATED-NII-CURRENT>                      (22292)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         436709
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<DIVIDEND-INCOME>                                34824
<INTEREST-INCOME>                                31560
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<EXPENSES-NET>                                   88676
<NET-INVESTMENT-INCOME>                        (22292)
<REALIZED-GAINS-CURRENT>                       1631755
<APPREC-INCREASE-CURRENT>                       973248
<NET-CHANGE-FROM-OPS>                          2582711
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                     (1324355)
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<NUMBER-OF-SHARES-SOLD>                          18235
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<SHARES-REINVESTED>                              90841
<NET-CHANGE-IN-ASSETS>                         2633885
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       129309
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            81855
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 106717
<AVERAGE-NET-ASSETS>                          27024775       
<PER-SHARE-NAV-BEGIN>                            12.25
<PER-SHARE-NII>                                 (0.01)
<PER-SHARE-GAIN-APPREC>                           1.25
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<PER-SHARE-DISTRIBUTIONS>                       (0.64)
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<EXPENSE-RATIO>                                   0.65
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 5
   <NAME> MFS INSTITUTIONAL RESEARCH FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         39776420
<INVESTMENTS-AT-VALUE>                        46400943
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<PAYABLE-FOR-SECURITIES>                        884612
<SENIOR-LONG-TERM-DEBT>                              0
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<TOTAL-LIABILITIES>                             919382
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      39854843
<SHARES-COMMON-STOCK>                          3717734
<SHARES-COMMON-PRIOR>                          3495392
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<OVERDISTRIBUTION-NII>                               0
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<OVERDISTRIBUTION-GAINS>                      (196354)
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<DIVIDEND-INCOME>                               204576
<INTEREST-INCOME>                                39888
<OTHER-INCOME>                                  (2340)
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<NET-INVESTMENT-INCOME>                          93626
<REALIZED-GAINS-CURRENT>                       1363936
<APPREC-INCREASE-CURRENT>                      1508611
<NET-CHANGE-FROM-OPS>                          2966173
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (191092)
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<NUMBER-OF-SHARES-SOLD>                         207859
<NUMBER-OF-SHARES-REDEEMED>                   (127425)
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<NET-CHANGE-IN-ASSETS>                         2769165
<ACCUMULATED-NII-PRIOR>                         103379
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<OVERDIST-NET-GAINS-PRIOR>                     (13245)
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<GROSS-EXPENSE>                                 182199
<AVERAGE-NET-ASSETS>                          45200936
<PER-SHARE-NAV-BEGIN>                            12.10
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                           0.80
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<PER-SHARE-DISTRIBUTIONS>                       (0.48)
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<EXPENSE-RATIO>                                    .65
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 2
   <NAME> MFS INSTL EMERGING EQUITIES FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                        388009584
<INVESTMENTS-AT-VALUE>                       428540305
<RECEIVABLES>                                  3443216
<ASSETS-OTHER>                                    3538
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<TOTAL-ASSETS>                               432025573
<PAYABLE-FOR-SECURITIES>                       1792564
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        65633
<TOTAL-LIABILITIES>                            1858197
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     380678667
<SHARES-COMMON-STOCK>                         21712652
<SHARES-COMMON-PRIOR>                         17882793
<ACCUMULATED-NII-CURRENT>                     (810832)
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<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      40530721
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<DIVIDEND-INCOME>                               232580
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<OTHER-INCOME>                                  (1731)
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<NET-INVESTMENT-INCOME>                       (810832)
<REALIZED-GAINS-CURRENT>                      42806813
<APPREC-INCREASE-CURRENT>                   (18199541)
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<EQUALIZATION>                                       0
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<NUMBER-OF-SHARES-REDEEMED>                  (2170840)
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<NET-CHANGE-IN-ASSETS>                        46530648
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<PER-SHARE-NAV-BEGIN>                            21.45
<PER-SHARE-NII>                                 (0.04)
<PER-SHARE-GAIN-APPREC>                           1.36
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<PER-SHARE-NAV-END>                              19.81
<EXPENSE-RATIO>                                   0.75
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<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 001
   <NAME> MFS INSTITUTIONAL GLOBAL FIXED INCOME FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         36895433
<INVESTMENTS-AT-VALUE>                        36358065
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<ASSETS-OTHER>                                     591
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<PAYABLE-FOR-SECURITIES>                       3244626
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       566037
<TOTAL-LIABILITIES>                            3810663
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      45470359
<SHARES-COMMON-STOCK>                          4595836
<SHARES-COMMON-PRIOR>                          5901426
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<ACCUM-APPREC-OR-DEPREC>                      (520380)
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<NET-INVESTMENT-INCOME>                        1467655
<REALIZED-GAINS-CURRENT>                        381370
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<NET-CHANGE-IN-ASSETS>                      (16625136)
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<PER-SHARE-NAV-BEGIN>                             9.07
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<EXPENSE-RATIO>                                   0.65
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</TABLE>


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