SEI INSTITUTIONAL INVESTMENTS TRUST
NSAR-A, 2000-01-27
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<PAGE>      PAGE  1
000 A000000 11/30/1999
000 C000000 0000939934
000 D000000 N
000 E000000 NF
000 F000000 Y
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000 H000000 N
000 I000000 6.1
000 J000000 U
001 A000000 SEI INSTITUTIONAL INVESTMENTS TRUST
001 B000000 811-7257
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
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007 C030100 N
007 C010200  2
007 C020200 SMALL CAP FUND
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007 C010300  3
007 C020300 CORE FIXED INCOME FUND
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007 C010500  5
007 C010600  6
007 C010700  7
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<PAGE>      PAGE  2
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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  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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SIGNATURE   MARK NAGLE
TITLE       CONTROLLER



<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000939934
<NAME> SEI INSTITUTIONAL INVESTMENTS TRUST
<SERIES>
   <NUMBER> 010
   <NAME> LARGE CAP FUND
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000939934
<NAME> SEI INSTITUTIONAL INVESTMENTS TRUST
<SERIES>
   <NUMBER> 020
   <NAME> SMALL CAP FUND
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