SEI INSTITUTIONAL INVESTMENTS TRUST
NSAR-A, 1997-01-29
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<PAGE>      PAGE  1
000 A000000 11/30/96
000 C000000 0000939934
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 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 Y
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  4
007 C010100  1
007 C020100 LARGE CAP FUND
007 C030100 N
007 C010200  2
007 C020200 SMALL CAP FUND
007 C030200 N
007 C010300  3
007 C020300 CORE FIXED INCOME FUND
007 C030300 N
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C020700 INTERNATIONAL EQUITY FUND
007 C030700 N
007 C010800  8
007 C010900  9
007 C011000 10
010 A00AA01 SEI FUND MANAGEMENT
010 C01AA01 OAKS
010 C02AA01 PA
010 C03AA01 19456
010 C04AA01 1100
011 A00AA01 SEI FINANCIAL SERVICES COMPANY
011 B00AA01 8-27897
011 C01AA01 OAKS
011 C02AA01 PA
011 C03AA01 19456
011 C04AA01 1100
<PAGE>      PAGE  2
012 A00AA01 SEI FUND MANAGEMENT
012 B00AA01 84-0000
012 C01AA01 OAKS
012 C02AA01 PA
012 C03AA01 19456
012 C04AA01 1100
013 A00AA01 COOPERS & LYBRAND LLP
013 B01AA01 PHILADELPHIA
013 B02AA01 PA
013 B03AA01 19103
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   52
019 C00AA00 SEIFINSVCO
020 A000001 WAKO INTERNATIONAL
020 C000001    275
020 A000002 YAMAICHI SECURITIES
020 B000002 13-5659656
020 C000002    166
020 A000003 INSTINET
020 B000003 13-3443395
020 C000003     81
020 A000004 MERRILL LYNCH
020 B000004 13-5674085
020 C000004     77
020 A000005 JAMES CAPEL
020 B000005 52-1348224
020 C000005     62
020 A000006 SALOMON BROTHERS
020 B000006 13-3082694
020 C000006     40
020 A000007 SEI CORPORATION
020 C000007     25
020 A000008 HOENIG
020 C000008     22
020 A000009 NOMURA TOKOYO
020 B000009 13-2642206
020 C000009     18
020 A000010 JARDINE FLEMING INTERNATIONAL SECURITIES
020 C000010     18
021  000000     1185
022 A000001 MERRILL LYNCH
022 B000001 13-5674085
022 C000001   1814517
022 D000001    185238
022 A000002 J.P. MORGAN EQUITIES
022 B000002 13-3224016
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022 A000003 MORGAN GRENFELL
022 C000003     65582
<PAGE>      PAGE  3
022 D000003         4
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022 C000005     28944
022 D000005     22474
022 A000006 PAINE WEBBER
022 B000006 13-2760086
022 C000006     38962
022 D000006      8596
022 A000007 GREENWICH CAPITAL MARKETS
022 B000007 13-3172275
022 C000007     18889
022 D000007     25663
022 A000008 MORGAN STANLEY
022 B000008 13-2655998
022 C000008     11970
022 D000008     28752
022 A000009 YAMAICHI
022 B000009 13-5659656
022 C000009     40142
022 D000009         0
022 A000010 LEHMAN BROTHERS
022 B000010 13-2927667
022 C000010     25688
022 D000010     13547
023 C000000    3589710
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039  00AA00 N
040  00AA00 N
<PAGE>      PAGE  4
041  00AA00 N
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042 E00AA00   0
042 F00AA00   0
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050  00AA00 N
051  00AA00 N
052  00AA00 N
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053 B00AA00 Y
053 C00AA00 N
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
055 A00AA00 N
055 B00AA00 N
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057  00AA00 N
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060 A00AA00 Y
060 B00AA00 Y
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077 A000000 N
008 A000101 SEI FINANCIAL MANAGEMENT
008 B000101 A
008 C000101 801-0000
008 D010101 OAKS
008 D020101 PA
008 D030101 19456
008 D040101 1100
008 A000102 ALLIANCE CAPITAL MANAGEMENT
<PAGE>      PAGE  5
008 B000102 S
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008 D010102 NEW YORK
008 D020102 NY
008 D030102 10105
008 A000103 IDS ADVISORY GROUP
008 B000103 S
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008 D010103 MINNEAPOLIS
008 D020103 MN
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008 D040103 2309
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008 D010104 CHICAGO
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008 D010106 SAN FRANCISCO
008 D020106 CA
008 D030106 94111
008 A000107 PROVIDENT INVESTMENT COUNSEL
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008 D030107 91101
015 A000101 CORESTATES BANK, N.A.
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025 C000102 E
<PAGE>      PAGE  6
025 D000102    1581
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<PAGE>      PAGE  7
048 B010100        0
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066 A000100 Y
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066 C000100 N
066 D000100 N
066 E000100 Y
066 F000100 N
066 G000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 N
070 A010100 Y
070 A020100 Y
<PAGE>      PAGE  8
070 B010100 Y
070 B020100 N
070 C010100 Y
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 Y
070 E020100 Y
070 F010100 Y
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 Y
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 Y
070 Q010100 N
070 Q020100 N
070 R010100 Y
070 R020100 N
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
074 W000100   0.0000
074 X000100        6
074 Y000100        0
075 A000100        0
075 B000100   240634
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008 A000201 SEI FINANCIAL MANAGEMENT
008 B000201 A
008 C000201 801-0000
008 D010201 OAKS
008 D020201 PA
008 D030201 19456
008 D040201 1100
008 A000202 NICHOLAS APPLEGATE CAPITAL MANAGEMENT
008 B000202 S
008 C000202 801-0000
008 D010202 SAN DIEGO
008 D020202 CA
008 D030202 92101
008 A000203 WALL STREET ASSOCIATES
008 B000203 S
008 C000203 801-0000
008 D010203 LA JOLLA
008 D020203 CA
008 D030203 92037
008 A000204 BOSTON PARTNERS ASSET MANAGEMENT
008 B000204 S
008 C000204 801-0000
008 D010204 BOSTON
008 D020204 MA
008 D030204 02111
008 A000205 1838 INVESTMENT ADVISORS
008 B000205 S
008 C000205 801-0000
008 D010205 RADNOR
008 D020205 PA
008 D030205 19087
008 A000206 FIRST OF AMERICA INVESTMENT CORPORATION
008 B000206 S
008 C000206 801-0000
008 D010206 LAKAMAZOO
008 D020206 MI
008 D030206 49009
008 A000207 FURMAN SELZ CAPITAL MANAGEMENT
008 B000207 S
008 C000207 801-0000
008 D010207 NEW YORK
008 D020207 NY
008 D030207 10169
015 A000201 CORESTATES BANK, N.A.
015 B000201 C
<PAGE>      PAGE  11
015 C010201 PHILADELPHIA
015 C020201 PA
015 C030201 19101
015 C040201 7618
015 E010201 X
024  000200 Y
025 A000201 MERRILL LYNCH
025 B000201 13-5674085
025 C000201 D
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045  000200 Y
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<PAGE>      PAGE  12
048 A020200 0.000
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066 A000200 Y
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066 D000200 N
066 E000200 N
066 F000200 N
066 G000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 N
070 A010200 Y
<PAGE>      PAGE  13
070 A020200 Y
070 B010200 Y
070 B020200 N
070 C010200 Y
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 Y
070 E020200 Y
070 F010200 Y
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070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 Y
070 I020200 N
070 J010200 Y
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070 L010200 Y
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<PAGE>      PAGE  14
072 M000200        1
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<PAGE>      PAGE  15
074 V020200     0.00
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008 A000301 SEI FINANCIAL MANAGEMENT
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008 D040301 1100
008 A000302 WESTERN ASSET MANAGEMENT
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008 C000302 801-0000
008 D010302 PASADENA
008 D020302 CA
008 D030302 91105
008 A000303 FIRSTAR INVESTMENT RESEARCH & MANAGEMENT CO
008 B000303 S
008 C000303 801-0000
008 D010303 MILWAUKEE
008 D020303 WI
008 D030303 53202
008 A000304 BLACKROCK FINANCIAL MANAGEMENT, INC.
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008 D020304 NY
008 D030304 10154
015 A000301 CORESTATES BANK, N.A.
015 B000301 C
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015 C020301 PA
015 C030301 19101
015 C040301 7618
015 E010301 X
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025 A000301 GOLDMAN SACHS
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025 A000302 J.P. MORGAN
025 B000302 13-3224016
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025 A000303 LEHMAN BROTHERS
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025 C000303 D
<PAGE>      PAGE  16
025 D000303    1000
025 A000304 PAINE WEBBER
025 B000304 13-2760086
025 C000304 D
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025 A000305 SALOMON BROTHERS
025 B000305 13-3082694
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045  000300 Y
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<PAGE>      PAGE  17
048 B020300 0.000
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<PAGE>      PAGE  18
070 C020300 Y
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008 D020701 MA
008 D030701 02110
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008 D050703 UNITED KINGDOM
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<PAGE>      PAGE  21
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066 A000700 Y
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066 E000700 N
066 F000700 N
066 G000700 N
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070 C020700 N
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070 E020700 N
070 F010700 Y
070 F020700 Y
070 G010700 Y
070 G020700 N
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070 J020700 N
070 K010700 Y
070 K020700 N
<PAGE>      PAGE  23
070 L010700 Y
070 L020700 Y
070 M010700 Y
070 M020700 Y
070 N010700 Y
070 N020700 N
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<PAGE>      PAGE  24
073 A010700   0.0000
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SIGNATURE   STEVE MEYER                                  
TITLE       CONTROLLER          
 


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<CIK> 0000939934
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<TABLE> <S> <C>

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