EXPLORER INSTITUTIONAL TRUST
NSAR-A, 1999-08-27
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<PAGE>      PAGE  1
000 A000000 06/30/99
000 C000000 0000791069
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 A
001 A000000 VAN KAMPEN EXPLORER INSTITUTIONAL TRUST
001 B000000 811-8808
001 C000000 6306846000
002 A000000 1 PARKVIEW PLAZA
002 B000000 OAKBROOK TERRACE
002 C000000 IL
002 D010000 60181
002 D020000 5555
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
007 C010100  1
007 C020100 EXPLORER INSTITUTIONAL ACTIVE CORE FUND
007 C030100 N
007 C010200  2
007 C020200 EXPLORER INSTITUTIONAL LIMITED DURATION FUND
007 C030200 N
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 VAN KAMPEN MANAGEMENT, INC
008 B00AA01 A
008 C00AA01 801-000000
008 D01AA01 OAKBROOK TERACE
008 D02AA01 IL
008 D03AA01 60181
008 D04AA01 5555
011 A00AA01 VAN KAMPEN FUNDS, INC.
011 B00AA01 8-19412
011 C01AA01 OAKBROOK TERRACE
011 C02AA01 IL
011 C03AA01 60181
012 A00AA01 VAN KAMPEN INVESTOR SERVICES, INC.
012 B00AA01 84-01621
<PAGE>      PAGE  2
012 C01AA01 KANSAS CITY
012 C02AA01 MO
012 C03AA01 64141
013 A00AA01 KPMG LLP
013 B01AA01 CHICAGO
013 B02AA01 IL
013 B03AA01 60601
014 A00AA01 MORGAN STANLEY & CO., INCORPORATED
014 B00AA01 8-00733537
014 A00AA02 DEAN WITTER REYNOLDS, INC.
014 B00AA02 8-00728181
015 A00AA01 STATE STREET BANK AND TRUST CO.
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02105
015 E01AA01 X
015 A00AA02 STATE STREET BANK AND TRUST COMPANY
015 B00AA02 S
015 C01AA02 BOSTON
015 C02AA02 MA
015 C03AA02 02105
015 E05AA02 X
018  00AA00 Y
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019 C00AA00 VANKAMPENF
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020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 FUJI SECURITIES INC
022 B000001 36-2880742
022 C000001    187131
022 D000001       303
022 A000002 MERRILL LYNCH INC
022 B000002 13-5674085
022 C000002      4405
022 D000002       946
022 A000003 BEAR STEARNS
022 B000003 13-3299429
022 C000003      1449
022 D000003       152
022 A000004 FIRST BOSTON CORP
<PAGE>      PAGE  3
022 B000004 13-5659485
022 C000004       485
022 D000004       670
022 A000005 FIRST CHICAGO CAPITAL MKTS
022 B000005 36-3595942
022 C000005       329
022 D000005       387
022 A000006 SALOMON SMITH BARNEY
022 B000006 13-3082694
022 C000006       605
022 D000006         0
022 A000007 GRUNTAL & CO
022 C000007       118
022 D000007        83
022 A000008 PAINE WEBBER
022 B000008 13-2638166
022 C000008       195
022 D000008         0
022 A000009 GOLDMAN SACHS
022 B000009 13-5108880
022 C000009       169
022 D000009         0
022 A000010 PRUDENTIAL SECURITIES
022 B000010 22-2347336
022 C000010       125
022 D000010         0
023 C000000     195035
023 D000000       2541
024  00AA00 N
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<PAGE>      PAGE  4
031 A00AA00      0
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048 K02AA00 0.250
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050  00AA00 N
051  00AA00 N
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053 B00AA00 N
<PAGE>      PAGE  5
053 C00AA00 Y
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 N
054 I00AA00 Y
054 J00AA00 N
054 K00AA00 N
054 L00AA00 N
054 M00AA00 N
054 N00AA00 N
054 O00AA00 N
066 A00AA00 N
067  00AA00 N
068 A00AA00 N
068 B00AA00 N
069  00AA00 N
077 A000000 N
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077 D000000 N
077 E000000 N
077 F000000 N
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
062 I000100   0.0
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062 L000100   0.0
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062 Q000100  12.1
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063 B000100  0.0
064 A000100 N
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070 G020100 N
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070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
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070 N020100 N
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070 O020100 N
070 P010100 N
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 Y
070 R020100 N
071 A000100      9783
<PAGE>      PAGE  8
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072EE000100        0
073 A010100   0.2810
073 A020100   0.0000
073 B000100   0.0000
073 C000100   0.0000
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074 B000100        0
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<PAGE>      PAGE  9
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074 N000100    18234
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<PAGE>      PAGE  10
035  000200      0
036 B000200      0
055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 N
060 B000200 N
061  000200   500000
062 A000200 Y
062 B000200   0.0
062 C000200  24.5
062 D000200   0.0
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200   0.0
062 M000200  47.3
062 N000200   4.2
062 O000200   0.0
062 P000200  18.6
062 Q000200   5.7
062 R000200   0.0
063 A000200   0
063 B000200  0.0
064 A000200 N
065  000200 N
070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 Y
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
<PAGE>      PAGE  11
070 J010200 Y
070 J020200 N
070 K010200 Y
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 Y
070 N010200 N
070 N020200 N
070 O010200 N
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200       777
071 B000200       317
071 C000200      2328
071 D000200   14
072 A000200  6
072 B000200       81
072 C000200        0
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072 Q000200        7
072 R000200        8
072 S000200        5
072 T000200        0
072 U000200        5
072 V000200        0
072 W000200        1
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072 Y000200       51
072 Z000200       75
072AA000200     5404
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<PAGE>      PAGE  12
072CC020200       56
072DD010200       75
072DD020200        0
072EE000200        0
073 A010200   0.2420
073 A020200   0.0000
073 B000200   0.0000
073 C000200   0.0000
074 A000200        9
074 B000200        0
074 C000200      749
074 D000200     2316
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
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074 U010200   317847
074 U020200        0
074 V010200     9.61
074 V020200     0.00
074 W000200   0.0000
074 X000200        6
074 Y000200        0
075 A000200        0
075 B000200     3004
076  000200     0.00
SIGNATURE   WESTON B. WETHERELL
TITLE       ATTORNEY


<TABLE> <S> <C>

<ARTICLE>                                            6
<SERIES>
   <NUMBER>                                         11
   <NAME>                                  ACTIVE CORE
<MULTIPLIER>                                         1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<INVESTMENTS-AT-COST>                       18,183,197
<INVESTMENTS-AT-VALUE>                      17,842,418
<RECEIVABLES>                                  291,264
<ASSETS-OTHER>                                  18,143
<OTHER-ITEMS-ASSETS>                            82,417
<TOTAL-ASSETS>                              18,234,242
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      153,810
<TOTAL-LIABILITIES>                            153,810
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    18,390,710
<SHARES-COMMON-STOCK>                        1,825,909
<SHARES-COMMON-PRIOR>                        1,143,960
<ACCUMULATED-NII-CURRENT>                       (5,406)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         35,907
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      (340,779)
<NET-ASSETS>                                18,080,432
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              403,329
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 (26,896)
<NET-INVESTMENT-INCOME>                        376,433
<REALIZED-GAINS-CURRENT>                        32,083
<APPREC-INCREASE-CURRENT>                     (683,954)
<NET-CHANGE-FROM-OPS>                         (275,438)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (376,430)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        681,119
<NUMBER-OF-SHARES-REDEEMED>                    (36,329)
<SHARES-REINVESTED>                             37,159
<NET-CHANGE-IN-ASSETS>                       6,226,655
<ACCUMULATED-NII-PRIOR>                         (5,409)
<ACCUMULATED-GAINS-PRIOR>                        3,824
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           20,136
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 73,095
<AVERAGE-NET-ASSETS>                        13,559,471
<PER-SHARE-NAV-BEGIN>                           10.362
<PER-SHARE-NII>                                  0.283
<PER-SHARE-GAIN-APPREC>                         (0.462)
<PER-SHARE-DIVIDEND>                            (0.281)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.902
<EXPENSE-RATIO>                                   0.40


</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                            6
<SERIES>
   <NUMBER>                                         21
   <NAME>                             LIMITED DURATION
<MULTIPLIER>                                         1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<INVESTMENTS-AT-COST>                        3,079,508
<INVESTMENTS-AT-VALUE>                       3,065,006
<RECEIVABLES>                                   40,603
<ASSETS-OTHER>                                  18,010
<OTHER-ITEMS-ASSETS>                             8,991
<TOTAL-ASSETS>                               3,132,610
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       78,132
<TOTAL-LIABILITIES>                             78,132
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     3,073,436
<SHARES-COMMON-STOCK>                          317,847
<SHARES-COMMON-PRIOR>                          279,454
<ACCUMULATED-NII-CURRENT>                      (10,543)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          6,087
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       (14,502)
<NET-ASSETS>                                 3,054,478
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               80,860
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  (5,957)
<NET-INVESTMENT-INCOME>                         74,903
<REALIZED-GAINS-CURRENT>                         5,404
<APPREC-INCREASE-CURRENT>                      (56,198)
<NET-CHANGE-FROM-OPS>                           24,109
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (74,900)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         30,776
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                              7,617
<NET-CHANGE-IN-ASSETS>                         323,276
<ACCUMULATED-NII-PRIOR>                        (10,546)
<ACCUMULATED-GAINS-PRIOR>                          683
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            4,466
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 56,712
<AVERAGE-NET-ASSETS>                         3,003,525
<PER-SHARE-NAV-BEGIN>                            9.773
<PER-SHARE-NII>                                  0.246
<PER-SHARE-GAIN-APPREC>                         (0.167)
<PER-SHARE-DIVIDEND>                            (0.242)
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              9.610
<EXPENSE-RATIO>                                   0.40


</TABLE>


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