SEI INSTITUTIONAL INVESTMENTS TRUST
NSAR-A, 1999-01-28
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<PAGE>      PAGE  1
000 A000000 11/30/98
000 C000000 0000939934
000 D000000 N
000 E000000 NF
000 F000000 Y
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000 J000000 U
001 A000000 SEI INSTITUTIONAL INVESTMENTS TRUST
001 B000000 811-7257
001 C000000 6109896024
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
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 INVESTMENTS MUTUAL FUNDS SERVICES
010 C01AA01 WAYNE
010 C02AA01 PA
010 C03AA01 19087
010 C04AA01 0451
011 A00AA01 SEI INVESTMENTS DISTRIBUTION CO.
011 B00AA01 8-0000
011 C01AA01 WAYNE
011 C02AA01 PA
011 C03AA01 19087
011 C04AA01 0451
<PAGE>      PAGE  2
012 A00AA01 SEI INVESTMENTS MUTUAL FUNDS SERVICES
012 B00AA01 84-0000
012 C01AA01 WAYNE
012 C02AA01 PA
012 C03AA01 19087
012 C04AA01 0451
013 A00AA01 PRICEWATERHOUSECOOPERS LLP
013 B01AA01 PHILADELPHIA
013 B02AA01 PA
013 B03AA01 19106
018  00AA00 Y
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019 C00AA00 SEIFINSVCO
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020 A000005 MERRILL LYNCH
020 B000005 13-5674085
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020 A000006 SMITH BARNEY
020 B000006 13-2518466
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020 A000007 PERSHING
020 C000007     41
020 A000008 SWISS BANK CORP
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<PAGE>      PAGE  3
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<PAGE>      PAGE  4
037  00AA00 N
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054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
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054 H00AA00 Y
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054 K00AA00 N
054 L00AA00 N
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008 A000101 SEI INVESTMENTS MANAGEMENT CORPORATION
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<PAGE>      PAGE  5
008 D020101 PA
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
070 B020100 N
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070 E010100 Y
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070 G020100 N
070 H010100 Y
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070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 Y
070 L010100 Y
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070 M010100 N
070 M020100 N
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070 O010100 Y
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
074 X000100       14
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008 A000201 SEI INVESTMENTS MANAGEMENT CORPORATION
008 B000201 A
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008 A000202 NICHOLAS APPLEGATE CAPITAL MANAGEMENT
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008 D020206 NY
008 D030206 10169
008 A000207 LSV ASSET MANAGEMENT
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008 D010207 CHICAGO
008 D020207 IL
008 D030207 60602
008 A000208 ROBERTSON STEPHENS INVESTMENT MANAGEMENT
008 B000208 S
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<PAGE>      PAGE  11
008 D010208 SAN FRANCISCO
008 D020208 CA
008 D030208 94104
015 A000201 FIRST UNION NATIONAL BANK
015 B000201 C
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015 C030201 19106
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<PAGE>      PAGE  12
046  000200 Y
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066 D000200 N
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066 F000200 N
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<PAGE>      PAGE  13
068 A000200 N
068 B000200 N
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070 D010200 Y
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070 J010200 Y
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070 K020200 Y
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070 M010200 N
070 M020200 N
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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008 A000301 SEI INVESTMENTS MANAGEMENT CORPORATION
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015 A000301 FIRST UNION NATIONAL BANK
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<PAGE>      PAGE  16
025 B000303 13-5108880
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<PAGE>      PAGE  17
048 B020300 0.000
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<PAGE>      PAGE  18
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008 D020703 NY
008 D030703 10048
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008 D020704 PA
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SIGNATURE   MARK NAGLE                                   
TITLE       CONTROLLER          
 


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<CIK> 0000939934
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