AIM INVESTMENT SECURITIES FUNDS INC
NSAR-B, 1996-09-26
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<PAGE>      PAGE  1
000 B000000 07/31/96
000 C000000 842790
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 AIM INVESTMENT SECURITIES FUNDS
001 B000000 811-5686
001 C000000 7136261919
002 A000000 11 GREENWAY PLAZA, SUITE 1919
002 B000000 HOUSTON
002 C000000 TX
002 D010000 77046
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
007 C010100  1
007 C010200  2
007 C020200 LIMITED MATURITY TREASURY INSTITUTIONAL SHARE
007 C030200 N
007 C010300  3
007 C020300 AIM LIMITED MATURITY TREASURY SHARES
007 C030300 N
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 AIM ADVISORS, INC.
008 B00AA01 A
008 C00AA01 801-12313
008 D01AA01 HOUSTON
008 D02AA01 TX
008 D03AA01 77046
013 A00AA01 KPMG PEAT MARWICK LLP
013 B01AA01 HOUSTON
013 B02AA01 TX
013 B03AA01 77002
015 A00AA01 BANK OF NEWYORK
015 B00AA01 C
015 C01AA01 NEWYORK
015 C02AA01 NY
015 C03AA01 10249
<PAGE>      PAGE  2
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   39
019 C00AA00 AIMFUNDSAA
022 A000001 CITICORP SECURITIES MARKETS INC.
022 B000001 13-4994650
022 C000001    125932
022 D000001     57370
022 A000002 MORGAN STANLEY & CO., INC.
022 B000002 13-2655998
022 C000002    105862
022 D000002     65398
022 A000003 FIRST BOSTON CORPORATION (THE)
022 B000003 13-5659485
022 C000003     59962
022 D000003     68441
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
022 C000004     65608
022 D000004     43796
022 A000005 SOLOMON BROTHERS INC.
022 B000005 13-3082694
022 C000005     74813
022 D000005     20050
022 A000006 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
022 B000006 13-2741729
022 C000006     66882
022 D000006     26729
022 A000007 PAINE WEBBER INC.
022 B000007 13-2638166
022 C000007     36810
022 D000007     26671
022 A000008 NOMURA SECURITIES INTERNATIONAL INC.
022 B000008 13-2642206
022 C000008     42360
022 D000008     13234
022 A000009 FUJI SECURITIES INC.
022 B000009 36-2880742
022 C000009      4856
022 D000009     43129
022 A000010 SMITH BARNEY, HARRIS UPHAM & CO. INC.
022 B000010 13-1912900
022 C000010      9979
022 D000010     36480
023 C000000     648234
023 D000000     546804
024  00AA00 N
026 A000000 Y
026 B000000 Y
026 C000000 N
<PAGE>      PAGE  3
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
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048 I02AA00 0.000
048 J01AA00        0
048 J02AA00 0.000
048 K01AA00   500000
048 K02AA00 0.175
049  00AA00 N
050  00AA00 N
051  00AA00 N
052  00AA00 N
053 A00AA00 N
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
<PAGE>      PAGE  4
054 N00AA00 N
054 O00AA00 N
062 A00AA00 Y
062 B00AA00   0.0
062 C00AA00   0.0
062 D00AA00   0.0
062 E00AA00   0.0
062 F00AA00   0.0
062 G00AA00   0.0
062 H00AA00   0.0
062 I00AA00   0.0
062 J00AA00   0.0
062 K00AA00   0.0
062 L00AA00   0.0
062 M00AA00  98.8
062 N00AA00   0.0
062 O00AA00   0.0
062 P00AA00   0.0
062 Q00AA00   0.0
062 R00AA00   0.0
063 A00AA00   0
063 B00AA00  1.6
064 A00AA00 N
066 A00AA00 N
067  00AA00 N
068 A00AA00 N
068 B00AA00 N
069  00AA00 N
070 A01AA00 Y
070 A02AA00 N
070 B01AA00 N
070 B02AA00 N
070 C01AA00 N
070 C02AA00 N
070 D01AA00 N
070 D02AA00 N
070 E01AA00 N
070 E02AA00 N
070 F01AA00 N
070 F02AA00 N
070 G01AA00 N
070 G02AA00 N
070 H01AA00 N
070 H02AA00 N
070 I01AA00 N
070 I02AA00 N
070 J01AA00 N
070 J02AA00 N
070 K01AA00 N
070 K02AA00 N
070 L01AA00 N
<PAGE>      PAGE  5
070 L02AA00 N
070 M01AA00 N
070 M02AA00 N
070 N01AA00 Y
070 N02AA00 N
070 O01AA00 Y
070 O02AA00 N
070 P01AA00 Y
070 P02AA00 N
070 Q01AA00 N
070 Q02AA00 N
070 R01AA00 N
070 R02AA00 N
077 A000000 Y
077 B000000 Y
078  000000 N
080 A00AA00 ICI MUTUAL INSURANCE CO.
080 C00AA00    30000
081 A00AA00 Y
081 B00AA00  80
082 A00AA00 Y
082 B00AA00      100
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
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086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
074 T000100        0
011 A000201 FUND MANAGEMENT COMPANY (FMC)
011 B000201 8-41848
011 C010201 HOUSTON
011 C020201 TX
011 C030201 77046
012 A000201 AIM INSTITUTIONAL FUND SERVICES,INC.
012 B000201 84-5541
012 C010201 HOUSTON
012 C020201 TX
012 C030201 77046
<PAGE>      PAGE  6
012 C040201 1173
028 A010200      5988
028 A020200        87
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028 A040200      2680
028 B010200      3924
028 B020200        91
028 B030200         0
028 B040200      6254
028 C010200      5821
028 C020200        87
028 C030200         0
028 C040200      3698
028 D010200      3447
028 D020200        78
028 D030200         0
028 D040200     10651
028 E010200      6579
028 E020200        64
028 E030200         0
028 E040200      2542
028 F010200       269
028 F020200        66
028 F030200         0
028 F040200       941
028 G010200     26028
028 G020200       473
028 G030200         0
028 G040200     26766
028 H000200         0
029  000200 N
030 A000200      0
030 B000200  0.00
030 C000200  0.00
034  000200 N
035  000200      0
036 B000200      0
037  000200 N
038  000200      0
039  000200 N
040  000200 N
055 A000200 N
055 B000200 N
056  000200 N
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 Y
060 B000200 Y
061  000200  1000000
071 A000200    648234
<PAGE>      PAGE  7
071 B000200    546804
071 C000200    466992
071 D000200  117
072 A000200 12
072 B000200     8468
072 C000200        0
072 D000200        0
072 E000200        0
072 F000200      283
072 G000200        0
072 H000200        0
072 I000200       10
072 J000200        7
072 K000200        0
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072 M000200        3
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072 P000200        0
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072 R000200        4
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072 U000200        0
072 V000200        0
072 W000200       29
072 X000200      384
072 Y000200        0
072 Z000200     8084
072AA000200     1141
072BB000200      228
072CC010200        0
072CC020200     1900
072DD010200     8084
072DD020200        0
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073 A010200   0.5769
073 A020200   0.0000
073 B000200   0.0000
073 C000200   0.0000
074 A000200        0
074 B000200        0
074 C000200        0
074 D000200   141772
074 E000200        0
074 F000200        0
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074 K000200        0
<PAGE>      PAGE  8
074 L000200     2552
074 M000200       43
074 N000200   144367
074 O000200        0
074 P000200       37
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200      862
074 S000200        0
074 T000200   143468
074 U010200    14389
074 U020200        0
074 V010200     9.97
074 V020200     0.00
074 W000200   0.0000
074 X000200       16
074 Y000200        0
075 A000200        0
075 B000200   140191
076  000200     0.00
011 A000301 AIM DISTRIBUTORS, INC.
011 B000301 8-21323
011 C010301 HOUSTON
011 C020301 TX
011 C030301 77046
012 A000301 AIM FUND SERVICES, INC.
012 B000301 84-5432
012 C010301 HOUSTON
012 C020301 TX
012 C030301 77210
012 C040301 4739
028 A010300     40604
028 A020300      1171
028 A030300         0
028 A040300     16887
028 B010300     23830
028 B020300      1288
028 B030300         0
028 B040300     11997
028 C010300     17914
028 C020300      1251
028 C030300         0
028 C040300     23195
028 D010300     18330
028 D020300      1271
028 D030300         0
028 D040300     19913
028 E010300     13949
028 E020300      1224
<PAGE>      PAGE  9
028 E030300         0
028 E040300     16185
028 F010300     21385
028 F020300      1420
028 F030300         0
028 F040300     16145
028 G010300    136012
028 G020300      7625
028 G030300         0
028 G040300    104322
028 H000300     29593
029  000300 Y
030 A000300    541
030 B000300  1.00
030 C000300  0.00
031 A000300    194
031 B000300      0
032  000300    347
033  000300      0
034  000300 N
035  000300      0
036 B000300      0
037  000300 N
038  000300      0
039  000300 N
040  000300 Y
041  000300 Y
042 A000300   0
042 B000300   0
042 C000300 100
042 D000300   0
042 E000300   0
042 F000300   0
042 G000300   0
042 H000300   0
043  000300    489
044  000300      0
055 A000300 N
055 B000300 N
056  000300 N
057  000300 N
058 A000300 N
059  000300 Y
060 A000300 Y
060 B000300 Y
061  000300      500
071 A000300    648234
071 B000300    546804
071 C000300    466992
071 D000300  117
072 A000300 12
<PAGE>      PAGE  10
072 B000300    19481
072 C000300        0
072 D000300        0
072 E000300        0
072 F000300      650
072 G000300        0
072 H000300        0
072 I000300      307
072 J000300       30
072 K000300        0
072 L000300       31
072 M000300        6
072 N000300        0
072 O000300        0
072 P000300        0
072 Q000300       42
072 R000300       21
072 S000300       17
072 T000300      489
072 U000300        0
072 V000300        0
072 W000300      155
072 X000300     1748
072 Y000300        0
072 Z000300    17733
072AA000300     2637
072BB000300      527
072CC010300        0
072CC020300     4393
072DD010300    17733
072DD020300        0
072EE000300        0
073 A010300   0.0549
073 A020300   0.0000
073 B000300   0.0000
073 C000300   0.0000
074 A000300        0
074 B000300        0
074 C000300        0
074 D000300   354806
074 E000300        0
074 F000300        0
074 G000300        0
074 H000300        0
074 I000300        0
074 J000300        0
074 K000300        0
074 L000300     6386
074 M000300      106
074 N000300   361298
074 O000300        0
<PAGE>      PAGE  11
074 P000300       94
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300     2156
074 S000300        0
074 T000300   359048
074 U010300    36010
074 U020300        0
074 V010300     9.97
074 V020300     0.00
074 W000300   0.0000
074 X000300    12222
074 Y000300        0
075 A000300        0
075 B000300   324132
076  000300     0.00
SIGNATURE   JONN J. ARTHUR                               
TITLE       SR. V.P. & TREASURER
 


<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information for the AIM Limited
Maturity Treasury Shares of the Limited Maturity Treasury  Portfolio for
the year ended July 31, 1996.
</LEGEND>
<CIK> 0000842790
<NAME> AIM INVESTMENT SECURITIES FUNDS
<SERIES>
   <NUMBER> 003
   <NAME> AIM LIMITED MATURITY TREASURY SHARES
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUL-31-1996
<PERIOD-END>                               JUL-31-1996
<INVESTMENTS-AT-COST>                        498859636
<INVESTMENTS-AT-VALUE>                       496578354
<RECEIVABLES>                                  8937020
<ASSETS-OTHER>                                  149663
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               505665037
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      3149232
<TOTAL-LIABILITIES>                            3149232
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     511800420
<SHARES-COMMON-STOCK>                         50399269
<SHARES-COMMON-PRIOR>                         40285235
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (7003333)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (2281282)
<NET-ASSETS>                                 502515805
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             27949530
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 2132159
<NET-INVESTMENT-INCOME>                       25817371
<REALIZED-GAINS-CURRENT>                       3022827
<APPREC-INCREASE-CURRENT>                    (6292910)
<NET-CHANGE-FROM-OPS>                         22547288
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (25817371)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       31057767
<NUMBER-OF-SHARES-REDEEMED>                 (22509171)
<SHARES-REINVESTED>                            1565438
<NET-CHANGE-IN-ASSETS>                        98505431
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                   (10026160)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           933207
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2132159
<AVERAGE-NET-ASSETS>                         325704724
<PER-SHARE-NAV-BEGIN>                            10.03
<PER-SHARE-NII>                                   0.55
<PER-SHARE-GAIN-APPREC>                         (0.06)
<PER-SHARE-DIVIDEND>                            (0.55)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                               9.97
<EXPENSE-RATIO>                                   0.54
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information for the Institutional
Shares of the Limited Maturity Treasury Portfolio for the year ended 
July 31, 1996.
</LEGEND>
<CIK> 0000842790
<NAME> AIM INVESTMENT SECURITIES FUNDS
<SERIES>
   <NUMBER> 2
   <NAME> LIMITED MATURITY TREASURY INSTITUTIONAL SHARES
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUL-31-1996
<PERIOD-END>                               JUL-31-1996
<INVESTMENTS-AT-COST>                        498859636
<INVESTMENTS-AT-VALUE>                       496578354
<RECEIVABLES>                                  8937020
<ASSETS-OTHER>                                  149663
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               505665037
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      3149232
<TOTAL-LIABILITIES>                            3149232
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     511800420
<SHARES-COMMON-STOCK>                         50399269
<SHARES-COMMON-PRIOR>                         40285235
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (7003333)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (2281282)
<NET-ASSETS>                                 502515805
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             27949530
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 2132159
<NET-INVESTMENT-INCOME>                       25817371
<REALIZED-GAINS-CURRENT>                       3022827
<APPREC-INCREASE-CURRENT>                    (6292910)
<NET-CHANGE-FROM-OPS>                         22547288
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (25817371)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       31057767
<NUMBER-OF-SHARES-REDEEMED>                 (22509171)
<SHARES-REINVESTED>                            1565438
<NET-CHANGE-IN-ASSETS>                        98505431
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                   (10026160)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           933207
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2132159
<AVERAGE-NET-ASSETS>                         140898895
<PER-SHARE-NAV-BEGIN>                            10.03
<PER-SHARE-NII>                                   0.58
<PER-SHARE-GAIN-APPREC>                         (0.06)
<PER-SHARE-DIVIDEND>                            (0.58)
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                               9.97
<EXPENSE-RATIO>                                   0.27
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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