ALLIANCE INSTITUTIONAL RESERVES INC
NSAR-A, 1998-12-30
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<PAGE>      PAGE  1
000 A000000 10/31/98
000 C000000 0000862021
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 ALLIANCE INSTITUTIONAL RESERVES
001 B000000 811-06068
001 C000000 2013194000
002 A000000 500 PLAZA DRIVE
002 B000000 SECAUCUS
002 C000000 NJ
002 D010000 07094
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  5
007 C010100  1
007 C020100 PRIME PORTFOLIO
007 C030100 N
007 C010200  2
007 C020200 GOVERNMENT PORTFOLIO
007 C030200 N
007 C010300  3
007 C020300 TAX-FREE PORTFOLIO
007 C030300 N
007 C010400  4
007 C020400 TRUST PORTFOLIO
007 C030400 N
007 C010500  5
007 C020500 TREASURY PORTFOLIO
007 C030500 N
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 ALLIANCE CAPITAL MANAGEMENT L.P.
008 B00AA01 A
008 C00AA01 801-32361
008 D01AA01 NEW YORK
008 D02AA01 NY
008 D03AA01 10105
011 A00AA01 ALLIANCE FUND SERVICES, INC.
011 B00AA01 8-30851
011 C01AA01 NEW YORK
<PAGE>      PAGE  2
011 C02AA01 NY
011 C03AA01 10105
012 A00AA01 ALLIANCE FUND SERVICES, INC.
012 B00AA01 84-001187
012 C01AA01 SECUACUS
012 C02AA01 NJ
012 C03AA01 07096
013 A00AA01 MCGLADREY & PULLEN, LLP
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10017
014 A00AA01 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
014 B00AA01 8-00017574
015 A00AA01 STATE STREET BANK AND TRUST CO.
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02105
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   52
019 C00AA00 ALLIANCECA
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020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
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020 C000008      0
020 C000009      0
020 C000010      0
021  000000        1
022 A000001 WEST DEUTSCHE LANDESBANK
022 C000001   3524900
022 D000001         0
022 A000002 GOLDMAN SACHS & CO.
022 B000002 13-5108880
022 C000002   3110151
022 D000002    142073
022 A000003 STATE STREET BANK AND TRUST CO.
022 B000003 04-1867445
022 C000003   1998169
022 D000003         0
022 A000004 MERRILL LYNCH, PIERCE, FENNER & SMITH, INC.
022 B000004 13-5674085
022 C000004   1621147
022 D000004    254413
022 A000005 MORGAN (J.P.) SECURITIES, INC.
022 B000005 13-3224016
<PAGE>      PAGE  3
022 C000005   1686176
022 D000005     16995
022 A000006 LEHMAN BROTHERS, INC.
022 B000006 13-2518466
022 C000006   1546126
022 D000006     41610
022 A000007 BANK OF MONTREAL, NEW YORK
022 C000007   1368194
022 D000007         0
022 A000008 SOCIETE GENERALE SECURITIES CORP.
022 B000008 13-1976032
022 C000008   1206222
022 D000008         0
022 A000009 MORGAN STANLEY & CO., INC.
022 B000009 13-2655998
022 C000009   1070660
022 D000009     35516
022 A000010 FIRST CHICAGO CAPITAL MARKETS
022 B000010 36-3595942
022 C000010   1058319
022 D000010     12998
023 C000000   29464411
023 D000000     954341
026 A000000 N
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026 C000000 N
026 D000000 N
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
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031 A00AA00      0
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036 B00AA00      0
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039  00AA00 N
040  00AA00 Y
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049  00AA00 N
050  00AA00 N
<PAGE>      PAGE  4
051  00AA00 N
052  00AA00 N
053 A00AA00 Y
053 B00AA00 Y
053 C00AA00 N
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 N
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054 F00AA00 N
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054 H00AA00 Y
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054 L00AA00 N
054 M00AA00 Y
054 N00AA00 Y
054 O00AA00 N
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056  00AA00 Y
057  00AA00 N
058 A00AA00 N
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058 C00AA00 N
058 D00AA00 N
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068 A00AA00 N
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080 A00AA00 ICI MUTUAL INSURANCE CO
080 B00AA00 GULF INSURANCE CO, CHUBB
080 C00AA00    95000
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<PAGE>      PAGE  5
085 A00AA00 Y
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
062 F000100  16.2
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064 A000100 N
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070 A010100 Y
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070 B010100 N
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 N
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
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070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 N
070 P020100 N
070 Q010100 N
070 Q020100 N
<PAGE>      PAGE  8
070 R010100 N
070 R020100 N
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
062 D000200  40.1
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070 A010200 Y
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070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
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070 K010200 N
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070 L010200 N
070 L020200 N
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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070 D020300 N
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070 E020300 N
070 F010300 N
070 F020300 N
070 G010300 N
070 G020300 N
070 H010300 N
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 N
070 K010300 N
070 K020300 N
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070 L020300 N
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070 M020300 N
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<PAGE>      PAGE  16
070 P010300 N
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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047  000400 Y
048  000400  0.450
048 A010400        0
048 A020400 0.000
048 B010400        0
048 B020400 0.000
048 C010400        0
048 C020400 0.000
048 D010400        0
048 D020400 0.000
048 E010400        0
048 E020400 0.000
048 F010400        0
048 F020400 0.000
<PAGE>      PAGE  19
048 G010400        0
048 G020400 0.000
048 H010400        0
048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
048 K010400        0
048 K020400 0.000
062 A000400 Y
062 B000400   0.0
062 C000400   2.0
062 D000400   0.0
062 E000400   0.0
062 F000400  15.1
062 G000400   0.0
062 H000400   0.0
062 I000400  44.7
062 J000400   4.4
062 K000400   0.0
062 L000400  33.4
062 M000400   0.0
062 N000400   0.0
062 O000400   0.0
062 P000400   0.0
062 Q000400   0.0
062 R000400   0.0
063 A000400  57
063 B000400  0.0
064 A000400 N
064 B000400 N
070 A010400 Y
070 A020400 Y
070 B010400 N
070 B020400 N
070 C010400 N
070 C020400 N
070 D010400 N
070 D020400 N
070 E010400 N
070 E020400 N
070 F010400 N
070 F020400 N
070 G010400 N
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
<PAGE>      PAGE  20
070 J020400 Y
070 K010400 N
070 K020400 N
070 L010400 N
070 L020400 N
070 M010400 N
070 M020400 N
070 N010400 N
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 N
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400         0
071 B000400         0
071 C000400         0
071 D000400    0
072 A000400  6
072 B000400    12061
072 C000400        0
072 D000400        0
072 E000400        0
072 F000400      965
072 G000400        0
072 H000400        0
072 I000400       14
072 J000400       54
072 K000400        0
072 L000400        6
072 M000400        6
072 N000400       59
072 O000400        0
072 P000400        0
072 Q000400        0
072 R000400        4
072 S000400        4
072 T000400        0
072 U000400        0
072 V000400        0
072 W000400        1
072 X000400     1113
072 Y000400       41
072 Z000400    10990
072AA000400        0
072BB000400        0
072CC010400        0
072CC020400        0
<PAGE>      PAGE  21
072DD010400    10990
072DD020400        0
072EE000400        0
073 A010400   0.0259
073 A020400   0.0000
073 B000400   0.0000
073 C000400   0.0000
074 A000400      228
074 B000400        0
074 C000400   453575
074 D000400        0
074 E000400        0
074 F000400        0
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400        0
074 K000400        7
074 L000400     2334
074 M000400        0
074 N000400   456144
074 O000400        0
074 P000400      188
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400      541
074 S000400        0
074 T000400   455415
074 U010400   455458
074 U020400        0
074 V010400     1.00
074 V020400     0.00
074 W000400   1.0001
074 X000400     1280
074 Y000400        0
075 A000400   422777
075 B000400        0
076  000400     0.00
024  000500 N
025 D000501       0
025 D000502       0
025 D000503       0
025 D000504       0
025 D000505       0
025 D000506       0
025 D000507       0
025 D000508       0
028 A010500         0
028 A020500         0
<PAGE>      PAGE  22
028 A030500         0
028 A040500         0
028 B010500      3903
028 B020500         1
028 B030500         0
028 B040500         0
028 C010500       146
028 C020500        19
028 C030500         0
028 C040500       419
028 D010500     10388
028 D020500        33
028 D030500         0
028 D040500       419
028 E010500       307
028 E020500        58
028 E030500         0
028 E040500       357
028 F010500       304
028 F020500        60
028 F030500         0
028 F040500      1178
028 G010500     15048
028 G020500       171
028 G030500         0
028 G040500      2373
028 H000500         0
042 A000500   0
042 B000500   0
042 C000500   0
042 D000500   0
042 E000500   0
042 F000500   0
042 G000500   0
042 H000500   0
043  000500      0
044  000500      0
045  000500 Y
046  000500 N
047  000500 Y
048  000500  0.200
048 A010500        0
048 A020500 0.000
048 B010500        0
048 B020500 0.000
048 C010500        0
048 C020500 0.000
048 D010500        0
048 D020500 0.000
048 E010500        0
048 E020500 0.000
<PAGE>      PAGE  23
048 F010500        0
048 F020500 0.000
048 G010500        0
048 G020500 0.000
048 H010500        0
048 H020500 0.000
048 I010500        0
048 I020500 0.000
048 J010500        0
048 J020500 0.000
048 K010500        0
048 K020500 0.000
062 A000500 Y
062 B000500   0.0
062 C000500  12.5
062 D000500  82.4
062 E000500   0.0
062 F000500   0.0
062 G000500   0.0
062 H000500   0.0
062 I000500   0.0
062 J000500   0.0
062 K000500   0.0
062 L000500   0.0
062 M000500   0.0
062 N000500   0.0
062 O000500   0.0
062 P000500   0.0
062 Q000500   0.0
062 R000500   0.0
063 A000500  15
063 B000500  0.0
070 A010500 Y
070 A020500 Y
070 B010500 N
070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 N
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
<PAGE>      PAGE  24
070 J020500 Y
070 K010500 N
070 K020500 N
070 L010500 N
070 L020500 N
070 M010500 N
070 M020500 N
070 N010500 N
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 N
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500         0
071 B000500         0
071 C000500         0
071 D000500    0
072 A000500  6
072 B000500      173
072 C000500        0
072 D000500        0
072 E000500        0
072 F000500        7
072 G000500        0
072 H000500        0
072 I000500        9
072 J000500       29
072 K000500        0
072 L000500        2
072 M000500        2
072 N000500       10
072 O000500        0
072 P000500        0
072 Q000500        0
072 R000500        4
072 S000500        2
072 T000500        0
072 U000500        0
072 V000500        0
072 W000500        1
072 X000500       66
072 Y000500       60
072 Z000500      166
072AA000500        0
072BB000500        0
072CC010500        0
072CC020500        0
<PAGE>      PAGE  25
072DD010500      166
072DD020500        0
072EE000500        0
073 A010500   0.0175
073 A020500   0.0021
073 B000500   0.0000
073 C000500   0.0000
074 A000500      624
074 B000500    10590
074 C000500     1601
074 D000500        0
074 E000500        0
074 F000500        0
074 G000500        0
074 H000500        0
074 I000500        0
074 J000500        0
074 K000500       12
074 L000500       71
074 M000500        0
074 N000500    12898
074 O000500        0
074 P000500       20
074 Q000500        0
074 R010500        0
074 R020500        0
074 R030500        0
074 R040500       32
074 S000500        0
074 T000500    12846
074 U010500    12680
074 U020500      166
074 V010500     1.00
074 V020500     1.00
074 W000500   0.9999
074 X000500        5
074 Y000500        0
075 A000500     9566
075 B000500        0
076  000500     0.00
SIGNATURE   CATHY WHITE                                  
TITLE       VICE PRESIDENT      
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 011
   <NAME> PRIME PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                    2,006,520,178
<INVESTMENTS-AT-VALUE>                   2,006,520,178
<RECEIVABLES>                               10,780,205
<ASSETS-OTHER>                               1,580,835
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,018,881,218
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      528,178
<TOTAL-LIABILITIES>                            528,178
<SENIOR-EQUITY>                             20,185,353
<PAID-IN-CAPITAL-COMMON>                 1,998,349,965
<SHARES-COMMON-STOCK>                    1,873,850,255
<SHARES-COMMON-PRIOR>                    1,764,876,578
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (182,278)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                             2,018,353,040
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           51,705,277
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,859,115)
<NET-INVESTMENT-INCOME>                     49,846,162
<REALIZED-GAINS-CURRENT>                         1,442
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       49,847,604
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (49,053,757)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                  8,969,193,126
<NUMBER-OF-SHARES-REDEEMED>            (8,909,273,205)
<SHARES-REINVESTED>                         49,053,757
<NET-CHANGE-IN-ASSETS>                     253,660,182
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (183,804)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,842,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,158,000
<AVERAGE-NET-ASSETS>                     1,786,446,640
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 012
   <NAME> PRIME PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                    2,006,520,178
<INVESTMENTS-AT-VALUE>                   2,006,520,178
<RECEIVABLES>                               10,780,205
<ASSETS-OTHER>                               1,580,835
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,018,881,218
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      528,178
<TOTAL-LIABILITIES>                            528,178
<SENIOR-EQUITY>                             20,185,353
<PAID-IN-CAPITAL-COMMON>                 1,998,349,965
<SHARES-COMMON-STOCK>                      132,387,709
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (182,278)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                             2,018,353,040
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           51,705,277
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,859,115)
<NET-INVESTMENT-INCOME>                     49,846,162
<REALIZED-GAINS-CURRENT>                         1,442
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       49,847,604
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (724,082)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    315,490,934
<NUMBER-OF-SHARES-REDEEMED>              (183,827,307)
<SHARES-REINVESTED>                            724,082
<NET-CHANGE-IN-ASSETS>                     253,660,182
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (183,804)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,842,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,158,000
<AVERAGE-NET-ASSETS>                        62,509,010
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.01
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.01)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .30
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 013
   <NAME> PRIME PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                    2,006,520,178
<INVESTMENTS-AT-VALUE>                   2,006,520,178
<RECEIVABLES>                               10,780,205
<ASSETS-OTHER>                               1,580,835
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,018,881,218
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      528,178
<TOTAL-LIABILITIES>                            528,178
<SENIOR-EQUITY>                             20,185,353
<PAID-IN-CAPITAL-COMMON>                 1,998,349,965
<SHARES-COMMON-STOCK>                       12,297,354
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (182,278)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                             2,018,353,040
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           51,705,277
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,859,115)
<NET-INVESTMENT-INCOME>                     49,846,162
<REALIZED-GAINS-CURRENT>                         1,442
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       49,847,604
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (68,323)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     13,283,215
<NUMBER-OF-SHARES-REDEEMED>                (1,054,185)
<SHARES-REINVESTED>                             68,323
<NET-CHANGE-IN-ASSETS>                     253,660,182
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (183,804)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,842,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              2,158,000
<AVERAGE-NET-ASSETS>                         4,309,386
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.02
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.02)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .45
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 021
   <NAME> GOVERNMENT PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      389,159,126
<INVESTMENTS-AT-VALUE>                     389,159,126
<RECEIVABLES>                                1,135,774
<ASSETS-OTHER>                                 124,158
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             390,419,058
<PAYABLE-FOR-SECURITIES>                    12,000,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      106,969
<TOTAL-LIABILITIES>                         12,106,969
<SENIOR-EQUITY>                              3,784,415
<PAID-IN-CAPITAL-COMMON>                   374,657,050
<SHARES-COMMON-STOCK>                      331,860,351
<SHARES-COMMON-PRIOR>                      274,591,724
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (129,376)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               378,312,089
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            8,788,787
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (327,209)
<NET-INVESTMENT-INCOME>                      8,461,578
<REALIZED-GAINS-CURRENT>                           973
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        8,462,551
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (8,121,533)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                  1,055,782,811
<NUMBER-OF-SHARES-REDEEMED>            (1,006,635,717)
<SHARES-REINVESTED>                          8,121,533
<NET-CHANGE-IN-ASSETS>                     103,850,714
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (131,350)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          320,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                433,000
<AVERAGE-NET-ASSETS>                       302,692,785
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 022
   <NAME> GOVERNMENT PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      389,159,126
<INVESTMENTS-AT-VALUE>                     389,159,126
<RECEIVABLES>                                1,135,774
<ASSETS-OTHER>                                 124,158
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             390,419,058
<PAYABLE-FOR-SECURITIES>                    12,000,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      106,969
<TOTAL-LIABILITIES>                         12,106,969
<SENIOR-EQUITY>                              3,784,415
<PAID-IN-CAPITAL-COMMON>                   374,657,050
<SHARES-COMMON-STOCK>                       46,401,732
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (129,376)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               378,312,089
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            8,788,787
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (327,209)
<NET-INVESTMENT-INCOME>                      8,461,578
<REALIZED-GAINS-CURRENT>                           973
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        8,462,551
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (339,792)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    104,679,951
<NUMBER-OF-SHARES-REDEEMED>               (58,618,011)
<SHARES-REINVESTED>                            339,792
<NET-CHANGE-IN-ASSETS>                     103,850,714
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (131,350)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          320,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                433,000
<AVERAGE-NET-ASSETS>                        28,020,078
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.01
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.01)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .30
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 023
   <NAME> GOVERNMENT PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      389,159,126
<INVESTMENTS-AT-VALUE>                     389,159,126
<RECEIVABLES>                                1,135,774
<ASSETS-OTHER>                                 124,158
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             390,419,058
<PAYABLE-FOR-SECURITIES>                    12,000,000
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      106,969
<TOTAL-LIABILITIES>                         12,106,969
<SENIOR-EQUITY>                              3,784,415
<PAID-IN-CAPITAL-COMMON>                   374,657,050
<SHARES-COMMON-STOCK>                          179,382
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (129,376)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               378,312,089
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            8,788,787
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (327,209)
<NET-INVESTMENT-INCOME>                      8,461,578
<REALIZED-GAINS-CURRENT>                           973
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        8,462,551
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (253)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        179,253
<NUMBER-OF-SHARES-REDEEMED>                      (124)
<SHARES-REINVESTED>                                253
<NET-CHANGE-IN-ASSETS>                     103,850,714
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                    (131,350)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          320,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                433,000
<AVERAGE-NET-ASSETS>                           162,715
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .45
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 031
   <NAME> TAX-FREE PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      430,670,784
<INVESTMENTS-AT-VALUE>                     430,670,784
<RECEIVABLES>                               26,651,279
<ASSETS-OTHER>                                 857,853
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,179,916
<PAYABLE-FOR-SECURITIES>                     6,500,597
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      166,882
<TOTAL-LIABILITIES>                          6,667,479
<SENIOR-EQUITY>                              4,515,959
<PAID-IN-CAPITAL-COMMON>                   447,079,973
<SHARES-COMMON-STOCK>                      356,198,972
<SHARES-COMMON-PRIOR>                      293,847,141
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (83,495)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               451,512,437
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            6,667,302
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (377,326)
<NET-INVESTMENT-INCOME>                      6,289,976
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        6,289,976
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (5,990,310)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                  1,228,035,893
<NUMBER-OF-SHARES-REDEEMED>            (1,171,674,371)
<SHARES-REINVESTED>                          5,990,310
<NET-CHANGE-IN-ASSETS>                     157,748,791
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     (83,663)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          368,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                488,000
<AVERAGE-NET-ASSETS>                       344,255,600
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.02
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.02)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 032
   <NAME> TAX-FREE PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      430,670,784
<INVESTMENTS-AT-VALUE>                     430,670,784
<RECEIVABLES>                               26,651,279
<ASSETS-OTHER>                                 857,853
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,179,916
<PAYABLE-FOR-SECURITIES>                     6,500,597
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      166,882
<TOTAL-LIABILITIES>                          6,667,479
<SENIOR-EQUITY>                              4,515,959
<PAID-IN-CAPITAL-COMMON>                   447,079,973
<SHARES-COMMON-STOCK>                       94,189,849
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (83,495)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               451,512,437
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            6,667,302
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (377,326)
<NET-INVESTMENT-INCOME>                      6,289,976
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        6,289,976
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (296,817)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    157,423,821
<NUMBER-OF-SHARES-REDEEMED>               (63,530,789)
<SHARES-REINVESTED>                            296,817
<NET-CHANGE-IN-ASSETS>                     157,748,791
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     (83,663)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          368,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                488,000
<AVERAGE-NET-ASSETS>                        43,373,140
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.01
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.01)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .30
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 033
   <NAME> TAX-FREE PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      430,670,784
<INVESTMENTS-AT-VALUE>                     430,670,784
<RECEIVABLES>                               26,651,279
<ASSETS-OTHER>                                 857,853
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             458,179,916
<PAYABLE-FOR-SECURITIES>                     6,500,597
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      166,882
<TOTAL-LIABILITIES>                          6,667,479
<SENIOR-EQUITY>                              4,515,959
<PAID-IN-CAPITAL-COMMON>                   447,079,973
<SHARES-COMMON-STOCK>                        1,207,111
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (83,495)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               451,512,437
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            6,667,302
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (377,326)
<NET-INVESTMENT-INCOME>                      6,289,976
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                        6,289,976
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (2,849)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,204,577
<NUMBER-OF-SHARES-REDEEMED>                      (316)
<SHARES-REINVESTED>                              2,849
<NET-CHANGE-IN-ASSETS>                     157,748,791
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     (83,663)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          368,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                488,000
<AVERAGE-NET-ASSETS>                           612,029
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .45
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 041
   <NAME> TRUST PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                      453,575,305
<INVESTMENTS-AT-VALUE>                     453,575,305
<RECEIVABLES>                                2,341,059
<ASSETS-OTHER>                                 227,685
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             456,144,049
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      729,085
<TOTAL-LIABILITIES>                            729,085
<SENIOR-EQUITY>                              4,554,582
<PAID-IN-CAPITAL-COMMON>                   450,903,613
<SHARES-COMMON-STOCK>                      455,458,195
<SHARES-COMMON-PRIOR>                      390,535,793
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (43,231)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                               455,414,964
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                           12,061,445
<OTHER-INCOME>                                       0
<EXPENSES-NET>                             (1,071,873)
<NET-INVESTMENT-INCOME>                     10,989,572
<REALIZED-GAINS-CURRENT>                           529
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                       10,990,101
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (10,989,572)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    722,285,781
<NUMBER-OF-SHARES-REDEEMED>              (668,352,951)
<SHARES-REINVESTED>                         10,989,572
<NET-CHANGE-IN-ASSETS>                      64,922,931
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     (56,967)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          965,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              1,113,000
<AVERAGE-NET-ASSETS>                       422,776,744
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .50
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 051
   <NAME> TREASURY PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                       12,190,592
<INVESTMENTS-AT-VALUE>                      12,190,592
<RECEIVABLES>                                   83,090
<ASSETS-OTHER>                                 624,318
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              12,898,000
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       51,520
<TOTAL-LIABILITIES>                             51,520
<SENIOR-EQUITY>                                128,463
<PAID-IN-CAPITAL-COMMON>                    12,717,862
<SHARES-COMMON-STOCK>                       12,680,519
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            155
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                12,846,480
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              172,818
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   6,552
<NET-INVESTMENT-INCOME>                        166,266
<REALIZED-GAINS-CURRENT>                           155
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                          166,421
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (165,894)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     14,887,040
<NUMBER-OF-SHARES-REDEEMED>                (2,372,415)
<SHARES-REINVESTED>                            165,894
<NET-CHANGE-IN-ASSETS>                      12,846,480
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            7,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 66,000
<AVERAGE-NET-ASSETS>                         9,410,073
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.02
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                            (0.02)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES
<SERIES>
   <NUMBER> 053
   <NAME> TREASURY PORTFOLIO
       
<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                          APR-30-1999
<PERIOD-START>                             MAY-01-1998
<PERIOD-END>                               OCT-31-1998
<INVESTMENTS-AT-COST>                       12,190,592
<INVESTMENTS-AT-VALUE>                      12,190,592
<RECEIVABLES>                                   83,090
<ASSETS-OTHER>                                 624,318
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              12,898,000
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       51,520
<TOTAL-LIABILITIES>                             51,520
<SENIOR-EQUITY>                                128,463
<PAID-IN-CAPITAL-COMMON>                    12,717,862
<SHARES-COMMON-STOCK>                          165,806
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            155
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                12,846,480
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              172,818
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   6,552
<NET-INVESTMENT-INCOME>                        166,266
<REALIZED-GAINS-CURRENT>                           155
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                          166,421
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (372)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        165,534
<NUMBER-OF-SHARES-REDEEMED>                      (100)
<SHARES-REINVESTED>                                372
<NET-CHANGE-IN-ASSETS>                      12,846,480
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            7,000
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 66,000
<AVERAGE-NET-ASSETS>                           165,295
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                    .45
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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