MFS INSTITUTIONAL TRUST
NSAR-A, 1999-02-24
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<PAGE>      PAGE  1
000 A000000 12/31/98
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 U
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  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
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02116
<PAGE>      PAGE  2
020 A000001 MERRILL LYNCH PIERCE
020 B000001 13-5674085
020 C000001     77
020 A000002 WEEDEN & CO.
020 B000002 13-3364318
020 C000002     39
020 A000003 MORGAN STANLEY AND CO, INC.
020 B000003 13-2655998
020 C000003     31
020 A000004 SMITH BARNEY INC.
020 B000004 13-1912900
020 C000004     25
020 A000005 DONALDSON, LUFKIN & JENRETTE
020 B000005 13-2741729
020 C000005     20
020 A000006 PAINE WEBBER INC.
020 B000006 13-2638166
020 C000006     19
020 A000007 CS FIRST BOSTON CORP.
020 B000007 13-5659485
020 C000007     17
020 A000008 NATIONBANC MONTGOMERY SE
020 B000008 00-0000000
020 C000008     15
020 A000009 GOLDMAN SACHS
020 B000009 13-5108880
020 C000009     15
020 A000010 INSTINET
020 B000010 13-3443395
020 C000010     15
021  000000      428
022 A000001 GENERAL ELECTRIC CAPITAL CORP.
022 B000001 00-0000000
022 C000001    600875
022 D000001         0
022 A000002 ASSOC. CORP. N.A.
022 B000002 00-0000000
022 C000002    252115
022 D000002         0
022 A000003 FORD MOTOR CREDIT
022 B000003 38-1612444
022 C000003    236041
022 D000003         0
022 A000004 NATIONS BANK
022 B000004 75-0520130
022 C000004    128532
022 D000004         0
022 A000005 CARROLL MCENTEE
022 B000005 00-0000000
022 C000005     89820
022 D000005      5485
<PAGE>      PAGE  3
022 A000006 CIT GROUP HOLDING INC.
022 B000006 00-0000000
022 C000006     85593
022 D000006         0
022 A000007 CS FIRST BOSTON CORP,
022 B000007 13-5659485
022 C000007     64442
022 D000007     10622
022 A000008 SMITH BARNEY
022 B000008 13-1912900
022 C000008     41580
022 D000008     32896
022 A000009 BANK OF BOSTON - DEALER
022 B000009 00-0000000
022 C000009     68107
022 D000009         0
022 A000010 PRUDENTIAL SECURITIES
022 B000010 22-2347336
022 C000010     63014
022 D000010      2108
023 C000000    1931093
023 D000000     173374
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
031 A00AA00      0
031 B00AA00      0
032  00AA00      0
033  00AA00      0
034  00AA00 N
035  00AA00      0
036 B00AA00      0
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
<PAGE>      PAGE  4
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
077 A000000 Y
077 B000000 N
077 C000000 Y
077 D000000 Y
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 Y
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078  000000 N
080 A00AA00 NATIONAL UNION INSURANCE CO.
080 B00AA00 FEDERAL INSURANCE CO.
080 C00AA00    90000
081 A00AA00 Y
081 B00AA00 131
082 A00AA00 Y
082 B00AA00      100
024  000100 N
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<PAGE>      PAGE  5
028 D010100         0
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055 A000100 Y
<PAGE>      PAGE  6
055 B000100 N
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
075 B000100    21600
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028 A010200     30920
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055 A000200 Y
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<PAGE>      PAGE  9
062 Q000200   0.0
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066 A000200 Y
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067  000200 N
068 A000200 N
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070 A010200 Y
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070 C010200 Y
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 Y
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 N
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 Y
070 N010200 N
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070 P010200 Y
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<PAGE>      PAGE  10
071 A000200    203397
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073 A010200   0.0000
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
070 M010300 Y
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
070 I010400 N
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024  000500 Y
025 A000501 CIT GROUP HOLDING INC.
025 C000501 E
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025 A000502 GENERAL ELECTRIC CAPITOL CORP.
025 C000502 D
<PAGE>      PAGE  17
025 D000502     945
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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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028 B030600         0
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<PAGE>      PAGE  21
028 G020600      4905
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055 A000600 N
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062 A000600 N
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062 J000600   0.0
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070 A010600 Y
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070 C020600 N
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070 E010600 Y
070 E020600 N
070 F010600 Y
070 F020600 N
070 G010600 Y
070 G020600 N
070 H010600 Y
070 H020600 N
070 I010600 N
070 I020600 N
070 J010600 Y
070 J020600 N
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<PAGE>      PAGE  22
070 L020600 Y
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070 Q010600 N
070 Q020600 N
070 R010600 N
070 R020600 N
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<PAGE>      PAGE  23
073 A020600   0.0000
073 B000600   1.7100
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<PAGE>      PAGE  24
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055 A000700 Y
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063 B000700  0.0
070 A010700 Y
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<PAGE>      PAGE  25
070 G020700 N
070 H010700 Y
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070 I010700 N
070 I020700 N
070 J010700 Y
070 J020700 Y
070 K010700 Y
070 K020700 N
070 L010700 Y
070 L020700 Y
070 M010700 Y
070 M020700 Y
070 N010700 Y
070 N020700 Y
070 O010700 Y
070 O020700 Y
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<PAGE>      PAGE  26
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SIGNATURE   ELLEN MOYNIHAN                               
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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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 4
   <NAME> MFS INSTITUTIONAL CORE PLUS FIXED INCOME FUND
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 070
   <NAME> INTERNATIONAL EQUITY FUND
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<PERIOD-START>                             JUL-01-1998
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST
<SERIES>
   <NUMBER> 006
   <NAME> MFS INSTITUTIONAL MID CAP GROWTH FUND
<MULTIPLIER> 1
       
<S>                             <C>
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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-30-1999
<PERIOD-START>                             JUL-01-1998
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<CIK> 0000867969
<NAME> MFS INSTITUTIONAL TRUST 
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   <NUMBER> 1
   <NAME> MFS INSTITUTIONAL GLOBAL FIXED INCOME FUND
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