SEI INSTITUTIONAL MANAGED TRUST
NSAR-A, 2000-05-26
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<PAGE>      PAGE  1
000 A000000 03/31/2000
000 C000000 0000804239
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 SEI INSTITUTIONAL MANAGED TRUST
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001 C000000 8003425734
002 A000000 2 OLIVER STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02109
003  000000 N
004  000000 N
005  000000 N
006  000000 N
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007 C030100 N
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007 C020200 BALANCED FUND
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007 C010300  3
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007 C010400  4
007 C020400 EQUITY INCOME FUND
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007 C010500  5
007 C020500 CORE FIXED INCOME FUND
007 C030500 N
007 C010600  6
007 C010700  7
007 C010800  8
007 C020800 SMALL CAP GROWTH FUND
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007 C010900  9
007 C020900 MID-CAP FUND
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007 C011000 10
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007 C011100 11
007 C021100 SMALL CAP VALUE FUND
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<PAGE>      PAGE  2
007 C011200 12
007 C021200 HIGH YIELD BOND FUND
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007 C021300 TAX-MANAGED LARGE CAP FUND
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007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
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010 A00AA01 SEI INVESTMENTS FUND MANAGEMENT
010 B00AA01 801-24593
010 C01AA01 WAYNE
010 C02AA01 PA
010 C03AA01 19087
010 C04AA01 0451
011 A00AA01 SEI INVESTMENTS DISTRIBUTION CO.
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011 C04AA01 0451
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012 C04AA01 0451
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013 B01AA01 PHILADELPHIA
013 B02AA01 PA
013 B03AA01 19106
015 A00AA01 FIRST UNION NATIONAL BANK
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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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008 A000201 SEI INVESTMENTS MANAGEMENT CORPORATION
008 B000201 A
008 C000201 801-24593
008 D010201 WAYNE
008 D020201 PA
008 D030201 19087
008 A000202 STI CAPITAL MANAGEMENT, N.A.
008 B000202 S
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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  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  37
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066 D000900 N
066 E000900 N
066 F000900 N
066 G000900 N
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068 A000900 N
068 B000900 N
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070 A010900 Y
070 A020900 Y
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070 C020900 N
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070 E010900 N
070 E020900 N
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070 F020900 N
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070 G020900 N
070 H010900 Y
070 H020900 N
070 I010900 Y
070 I020900 N
070 J010900 Y
070 J020900 N
070 K010900 Y
070 K020900 N
070 L010900 N
070 L020900 N
070 M010900 N
070 M020900 N
070 N010900 Y
070 N020900 N
070 O010900 Y
070 O020900 N
070 P010900 N
070 P020900 N
070 Q010900 N
070 Q020900 N
070 R010900 N
<PAGE>      PAGE  38
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<PAGE>      PAGE  39
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<PAGE>      PAGE  40
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<PAGE>      PAGE  41
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066 A001000 Y
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066 C001000 Y
<PAGE>      PAGE  42
066 D001000 N
066 E001000 N
066 F001000 N
066 G001000 N
067  001000 N
068 A001000 N
068 B001000 N
069  001000 N
070 A011000 Y
070 A021000 N
070 B011000 Y
070 B021000 N
070 C011000 N
070 C021000 N
070 D011000 Y
070 D021000 N
070 E011000 N
070 E021000 N
070 F011000 Y
070 F021000 Y
070 G011000 Y
070 G021000 N
070 H011000 Y
070 H021000 N
070 I011000 Y
070 I021000 N
070 J011000 Y
070 J021000 N
070 K011000 Y
070 K021000 Y
070 L011000 N
070 L021000 N
070 M011000 N
070 M021000 N
070 N011000 Y
070 N021000 N
070 O011000 Y
070 O021000 N
070 P011000 N
070 P021000 N
070 Q011000 N
070 Q021000 N
070 R011000 N
070 R021000 N
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<PAGE>      PAGE  43
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<PAGE>      PAGE  44
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008 A001101 SEI INVESTMENTS MANAGEMENT CORPORATION
008 B001101 A
008 C001101 801-24593
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008 D021101 PA
008 D031101 19087
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008 D031104 60606
008 A001105 MELLON EQUITY ASSOCIATES, LLP
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<PAGE>      PAGE  45
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024  001100 Y
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<PAGE>      PAGE  46
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045  001100 Y
046  001100 Y
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<PAGE>      PAGE  47
062 R001100   0.0
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068 A001100 N
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070 A011100 Y
070 A021100 Y
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070 K021100 Y
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070 L021100 N
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070 M021100 N
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070 Q021100 N
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070 R021100 N
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<PAGE>      PAGE  48
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<PAGE>      PAGE  49
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008 A001201 SEI INVESTMENTS MANAGEMENT CORPORATION
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008 C001201 801-24593
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008 A001203 NOMURA CORP.RESEARCH AND MNGT.CORP.
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<PAGE>      PAGE  50
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<PAGE>      PAGE  51
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064 A001200 N
064 B001200 Y
065  001200 N
066 A001200 N
067  001200 N
068 A001200 N
068 B001200 N
069  001200 N
070 A011200 Y
070 A021200 Y
070 B011200 Y
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070 C021200 N
070 D011200 Y
070 D021200 N
070 E011200 N
070 E021200 N
070 F011200 Y
070 F021200 N
070 G011200 Y
070 G021200 N
070 H011200 Y
070 H021200 N
<PAGE>      PAGE  52
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070 I021200 N
070 J011200 Y
070 J021200 N
070 K011200 Y
070 K021200 Y
070 L011200 N
070 L021200 N
070 M011200 N
070 M021200 N
070 N011200 Y
070 N021200 N
070 O011200 Y
070 O021200 N
070 P011200 N
070 P021200 N
070 Q011200 N
070 Q021200 N
070 R011200 N
070 R021200 N
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<PAGE>      PAGE  53
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008 A001301 SEI INVESTMENTS MANAGEMENT CORPORATION
008 B001301 A
008 C001301 801-24593
008 D011301 WAYNE
008 D021301 PA
008 D031301 19087
008 A001302 ALLIANCE CAPITAL MANAGEMENT, L.P.
008 B001302 S
<PAGE>      PAGE  54
008 C001302 801-0000
008 D011302 NEW YORK
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008 D031302 10105
008 A001303 MELLON EQUITY ASSOCIATES, LLP
008 B001303 S
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008 D031303 15258
008 A001304 SANFORD C. BERNSTEIN & CO., INC.
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<PAGE>      PAGE  55
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029  001300 N
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042 A001300   0
042 B001300   0
042 C001300   0
042 D001300   0
042 E001300   0
042 F001300   0
042 G001300   0
042 H001300   0
043  001300      0
044  001300      0
045  001300 Y
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047  001300 Y
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048 G021300 0.000
048 H011300        0
048 H021300 0.000
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048 I021300 0.000
<PAGE>      PAGE  56
048 J011300        0
048 J021300 0.000
048 K011300        0
048 K021300 0.000
062 A001300 N
062 B001300   0.0
062 C001300   0.0
062 D001300   0.0
062 E001300   0.0
062 F001300   0.0
062 G001300   0.0
062 H001300   0.0
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062 J001300   0.0
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062 L001300   0.0
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062 O001300   0.0
062 P001300   0.0
062 Q001300   0.0
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063 B001300  0.0
066 A001300 Y
066 B001300 N
066 C001300 Y
066 D001300 N
066 E001300 N
066 F001300 N
066 G001300 N
067  001300 N
068 A001300 N
068 B001300 N
069  001300 N
070 A011300 Y
070 A021300 Y
070 B011300 Y
070 B021300 N
070 C011300 N
070 C021300 N
070 D011300 Y
070 D021300 N
070 E011300 N
070 E021300 N
070 F011300 Y
070 F021300 Y
070 G011300 Y
070 G021300 N
070 H011300 Y
070 H021300 N
<PAGE>      PAGE  57
070 I011300 Y
070 I021300 N
070 J011300 Y
070 J021300 N
070 K011300 Y
070 K021300 Y
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 Y
070 N021300 N
070 O011300 Y
070 O021300 N
070 P011300 N
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
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072BB001300     8983
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072DD011300     3264
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074 I001300        0
074 J001300        0
074 K001300        0
074 L001300        0
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SIGNATURE   MARK NAGLE
TITLE       CONTROLLER



<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
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   <NUMBER> 100
   <NAME> LARGE CAP GROWTH FUND
<MULTIPLIER> 1,000

<S>                             <C>
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<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
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   <NAME> HIGH YIELD BOND FUND
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
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   <NAME> LARGE CAP VALUE FUND
<MULTIPLIER> 1,000

<S>                             <C>
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<EXPENSE-RATIO>                                  0.850


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUITIONAL MANAGED TRUST
<SERIES>
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   <NAME> BALANCED FUND
<MULTIPLIER> 1,000

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
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<EXPENSE-RATIO>                                  0.850


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
   <NUMBER> 050
   <NAME> CORE FIXED INCOME FUND
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
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   <NUMBER> 080
   <NAME> SMALL CAP GROWTH FUND (CLASS A)
<MULTIPLIER> 1,000

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
   <NUMBER> 081
   <NAME> SMALL CAP GROWTH FUND (CLASS D)
<MULTIPLIER> 1,000

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUTIONAL MANAGED TRUST
<SERIES>
   <NUMBER> 090
   <NAME> MID CAP FUND
<MULTIPLIER> 1,000

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000804239
<NAME> SEI INSTITUITIONAL MANAGED TRUST
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   <NUMBER> 130
   <NAME> TAX MANAGED LARGE CAP
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<S>                             <C>
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</TABLE>


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