<PAGE> PAGE 1
000 A000000 10/31/96
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 ACM INSTITUTIONAL RESERVES, INC.
001 B000000 811-6068
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 4
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 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
010 A00AA01 ALLIANCE CAPITAL MANAGEMENT, L.P.
010 B00AA01 801-32361
010 C01AA01 NEW YORK
010 C02AA01 NY
010 C03AA01 10105
<PAGE> PAGE 2
011 A00AA01 ALLIANCE FUND SERVICES, INC.
011 B00AA01 8-30851
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10105
012 A00AA01 ALLIANCE FUND SERVICES, INC.
012 B00AA01 84-001187
012 C01AA01 SECUACUS
012 C02AA01 NJ
012 C03AA01 07094
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
014 A00AA02 PERSHING
014 B00AA02 8-00017574
014 A00AA03 AUTRONET
014 B00AA03 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 50
019 C00AA00 ALLIANCECA
020 C000001 0
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 1
022 A000001 GOLDMAN SACHS
022 B000001 13-5108880
022 C000001 2104153
022 D000001 672212
022 A000002 STATE STREET BANK AND TRUST CO.
022 B000002 04-1867445
022 C000002 1860096
022 D000002 4100
022 A000003 MORGAN (J.P.) SECURITIES INC.
022 B000003 13-3224016
<PAGE> PAGE 3
022 C000003 1095279
022 D000003 305417
022 A000004 MERRILL LYNCH, PIERCE, FENNER & SMITH
022 B000004 13-5674085
022 C000004 969372
022 D000004 383651
022 A000005 BANK OF TOKYO
022 C000005 684700
022 D000005 0
022 A000006 LEHMAN BROTHERS INC.
022 B000006 13-2518466
022 C000006 568316
022 D000006 55167
022 A000007 PRUDENTIAL SECURITIES INC.
022 B000007 22-2347336
022 C000007 453287
022 D000007 41893
022 A000008 SUMITOMO BANK
022 C000008 475400
022 D000008 0
022 A000009 MORGAN STANLEY & CO., INC.
022 B000009 13-2655998
022 C000009 412261
022 D000009 41919
022 A000010 BANKERS TRUST COMPANY
022 B000010 13-4941247
022 C000010 314670
022 D000010 121023
023 C000000 11027279
023 D000000 2116331
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 N
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
029 00AA00 N
030 A00AA00 0
030 B00AA00 0.00
030 C00AA00 0.00
031 A00AA00 0
031 B00AA00 0
032 00AA00 0
033 00AA00 0
034 00AA00 N
035 00AA00 0
036 B00AA00 0
<PAGE> PAGE 4
037 00AA00 N
038 00AA00 0
039 00AA00 N
040 00AA00 N
041 00AA00 N
042 A00AA00 0
042 B00AA00 0
042 C00AA00 0
042 D00AA00 0
042 E00AA00 0
042 F00AA00 0
042 G00AA00 0
042 H00AA00 0
043 00AA00 0
044 00AA00 0
049 00AA00 N
050 00AA00 N
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
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 Y
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 Y
054 O00AA00 N
055 A00AA00 N
055 B00AA00 N
056 00AA00 Y
057 00AA00 N
058 A00AA00 N
058 B00AA00 N
058 C00AA00 N
058 D00AA00 N
058 E00AA00 N
059 00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061 00AA00 1000000
066 A00AA00 N
<PAGE> PAGE 5
067 00AA00 N
068 A00AA00 N
068 B00AA00 N
069 00AA00 N
077 A000000 N
078 000000 N
080 A00AA00 ICI MUTUAL INSURANCE CO
080 B00AA00 GULF INSURANCE CO
080 C00AA00 74000
081 A00AA00 Y
081 B00AA00 94
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A010000 0
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
024 000100 Y
025 A000101 GOLDMAN SACHS
025 B000101 13-5108880
025 C000101 D
025 D000101 27000
025 A000102 MERRILL LYNCH, PIERCE, FENNER & SMITH
025 B000102 13-5674085
025 C000102 D
025 D000102 17118
025 A000103 MORGAN (J.P.) SECURITIES INC.
025 B000103 13-3224016
025 C000103 D
025 D000103 9996
025 A000104 DELETE
025 D000104 0
025 D000105 0
025 D000106 0
025 D000107 0
025 D000108 0
028 A010100 805006
<PAGE> PAGE 6
028 A020100 2499
028 A030100 0
028 A040100 793310
028 B010100 658973
028 B020100 2145
028 B030100 0
028 B040100 712368
028 C010100 1173128
028 C020100 2656
028 C030100 0
028 C040100 885354
028 D010100 870579
028 D020100 3317
028 D030100 0
028 D040100 943945
028 E010100 796697
028 E020100 2485
028 E030100 0
028 E040100 790323
028 F010100 990959
028 F020100 3145
028 F030100 0
028 F040100 1049985
028 G010100 5295342
028 G020100 16247
028 G030100 0
028 G040100 5175285
028 H000100 0
045 000100 Y
046 000100 N
047 000100 Y
048 000100 0.200
048 A010100 0
048 A020100 0.000
048 B010100 0
048 B020100 0.000
048 C010100 0
048 C020100 0.000
048 D010100 0
048 D020100 0.000
048 E010100 0
048 E020100 0.000
048 F010100 0
048 F020100 0.000
048 G010100 0
048 G020100 0.000
048 H010100 0
048 H020100 0.000
048 I010100 0
048 I020100 0.000
048 J010100 0
<PAGE> PAGE 7
048 J020100 0.000
048 K010100 0
048 K020100 0.000
062 A000100 Y
062 B000100 1.6
062 C000100 8.1
062 D000100 0.0
062 E000100 0.0
062 F000100 29.5
062 G000100 0.0
062 H000100 0.0
062 I000100 43.9
062 J000100 0.0
062 K000100 0.0
062 L000100 17.5
062 M000100 0.0
062 N000100 0.0
062 O000100 0.0
062 P000100 0.0
062 Q000100 0.0
062 R000100 0.0
063 A000100 47
063 B000100 0.0
064 A000100 N
064 B000100 N
070 A010100 Y
070 A020100 Y
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
<PAGE> PAGE 8
070 N010100 N
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 N
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
071 A000100 0
071 B000100 0
071 C000100 0
071 D000100 0
072 A000100 6
072 B000100 16863
072 C000100 0
072 D000100 0
072 E000100 0
072 F000100 616
072 G000100 0
072 H000100 0
072 I000100 13
072 J000100 63
072 K000100 0
072 L000100 2
072 M000100 2
072 N000100 99
072 O000100 0
072 P000100 0
072 Q000100 0
072 R000100 5
072 S000100 3
072 T000100 0
072 U000100 0
072 V000100 0
072 W000100 7
072 X000100 810
072 Y000100 194
072 Z000100 16247
072AA000100 0
072BB000100 4
072CC010100 0
072CC020100 0
072DD010100 16247
072DD020100 0
072EE000100 0
073 A010100 0.0266
073 A020100 0.0000
073 B000100 0.0000
073 C000100 0.0000
<PAGE> PAGE 9
074 A000100 0
074 B000100 0
074 C000100 633431
074 D000100 0
074 E000100 0
074 F000100 0
074 G000100 0
074 H000100 0
074 I000100 0
074 J000100 0
074 K000100 41
074 L000100 3202
074 M000100 0
074 N000100 636674
074 O000100 0
074 P000100 120
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 6936
074 S000100 0
074 T000100 629618
074 U010100 629808
074 U020100 0
074 V010100 1.00
074 V020100 0.00
074 W000100 0.9998
074 X000100 1269
074 Y000100 0
075 A000100 611005
075 B000100 0
076 000100 0.00
024 000200 Y
025 A000201 GOLDMAN SACHS
025 B000201 13-5108880
025 C000201 D
025 D000201 7000
025 A000202 LEHMAN BROTHERS INC.
025 B000202 13-2518466
025 C000202 D
025 D000202 7000
025 A000203 MERRILL LYNCH, PIERCE, FENNER & SMITH
025 B000203 13-5674085
025 C000203 D
025 D000203 7000
025 A000204 MORGAN STANLEY & CO., INC.
025 B000204 13-2655998
025 C000204 D
025 D000204 8000
025 A000205 PRUDENTIAL SECURITIES INC.
<PAGE> PAGE 10
025 B000205 22-2347336
025 C000205 D
025 D000205 8000
025 D000206 0
025 D000207 0
025 D000208 0
028 A010200 59012
028 A020200 686
028 A030200 0
028 A040200 50445
028 B010200 114915
028 B020200 724
028 B030200 0
028 B040200 79515
028 C010200 79368
028 C020200 837
028 C030200 0
028 C040200 90825
028 D010200 57531
028 D020200 810
028 D030200 0
028 D040200 114800
028 E010200 94771
028 E020200 671
028 E030200 0
028 E040200 69798
028 F010200 70999
028 F020200 736
028 F030200 0
028 F040200 60929
028 G010200 476596
028 G020200 4464
028 G030200 0
028 G040200 466312
028 H000200 0
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.200
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
<PAGE> PAGE 11
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
062 A000200 Y
062 B000200 7.3
062 C000200 64.8
062 D000200 27.3
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 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 0.0
063 A000200 47
063 B000200 0.0
064 A000200 N
064 B000200 N
070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 N
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
<PAGE> PAGE 12
070 J020200 N
070 K010200 N
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 N
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200 0
071 B000200 0
071 C000200 0
071 D000200 0
072 A000200 6
072 B000200 4636
072 C000200 0
072 D000200 0
072 E000200 0
072 F000200 172
072 G000200 0
072 H000200 0
072 I000200 12
072 J000200 36
072 K000200 0
072 L000200 0
072 M000200 3
072 N000200 41
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 4
072 S000200 3
072 T000200 0
072 U000200 2
072 V000200 0
072 W000200 5
072 X000200 278
072 Y000200 106
072 Z000200 4464
072AA000200 0
072BB000200 2
072CC010200 0
072CC020200 0
<PAGE> PAGE 13
072DD010200 4464
072DD020200 0
072EE000200 0
073 A010200 0.0260
073 A020200 0.0000
073 B000200 0.0000
073 C000200 0.0000
074 A000200 0
074 B000200 45200
074 C000200 119311
074 D000200 0
074 E000200 0
074 F000200 0
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 0
074 K000200 17
074 L000200 1137
074 M000200 0
074 N000200 165665
074 O000200 0
074 P000200 34
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 69
074 S000200 0
074 T000200 165562
074 U010200 165694
074 U020200 0
074 V010200 1.00
074 V020200 0.00
074 W000200 0.9994
074 X000200 120
074 Y000200 0
075 A000200 170359
075 B000200 0
076 000200 0.00
024 000300 N
025 D000301 0
025 D000302 0
025 D000303 0
025 D000304 0
025 D000305 0
025 D000306 0
025 D000307 0
025 D000308 0
028 A010300 135072
028 A020300 609
<PAGE> PAGE 14
028 A030300 0
028 A040300 120622
028 B010300 146906
028 B020300 606
028 B030300 0
028 B040300 145853
028 C010300 153177
028 C020300 626
028 C030300 0
028 C040300 147232
028 D010300 159088
028 D020300 640
028 D030300 0
028 D040300 147972
028 E010300 118184
028 E020300 583
028 E030300 0
028 E040300 136962
028 F010300 121699
028 F020300 557
028 F030300 0
028 F040300 147824
028 G010300 834126
028 G020300 3621
028 G030300 0
028 G040300 846465
028 H000300 0
045 000300 Y
046 000300 N
047 000300 Y
048 000300 0.200
048 A010300 0
048 A020300 0.000
048 B010300 0
048 B020300 0.000
048 C010300 0
048 C020300 0.000
048 D010300 0
048 D020300 0.000
048 E010300 0
048 E020300 0.000
048 F010300 0
048 F020300 0.000
048 G010300 0
048 G020300 0.000
048 H010300 0
048 H020300 0.000
048 I010300 0
048 I020300 0.000
048 J010300 0
048 J020300 0.000
<PAGE> PAGE 15
048 K010300 0
048 K020300 0.000
062 A000300 Y
062 B000300 0.0
062 C000300 0.0
062 D000300 0.0
062 E000300 100.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 0.0
062 M000300 0.0
062 N000300 0.0
062 O000300 0.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
063 A000300 66
063 B000300 0.0
064 A000300 Y
064 B000300 N
070 A010300 Y
070 A020300 N
070 B010300 N
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 N
070 D020300 N
070 E010300 N
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 Y
070 K010300 N
070 K020300 N
070 L010300 N
070 L020300 N
070 M010300 N
070 M020300 N
070 N010300 N
<PAGE> PAGE 16
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 N
070 P020300 N
070 Q010300 N
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300 0
071 B000300 0
071 C000300 0
071 D000300 0
072 A000300 6
072 B000300 3829
072 C000300 0
072 D000300 0
072 E000300 0
072 F000300 208
072 G000300 0
072 H000300 0
072 I000300 10
072 J000300 41
072 K000300 0
072 L000300 1
072 M000300 3
072 N000300 57
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 5
072 S000300 3
072 T000300 0
072 U000300 2
072 V000300 0
072 W000300 3
072 X000300 333
072 Y000300 125
072 Z000300 3621
072AA000300 0
072BB000300 4
072CC010300 1
072CC020300 0
072DD010300 3621
072DD020300 0
072EE000300 0
073 A010300 0.0176
073 A020300 0.0000
073 B000300 0.0000
073 C000300 0.0000
074 A000300 0
<PAGE> PAGE 17
074 B000300 0
074 C000300 174938
074 D000300 0
074 E000300 0
074 F000300 0
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 0
074 K000300 23
074 L000300 934
074 M000300 0
074 N000300 175895
074 O000300 0
074 P000300 34
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 962
074 S000300 0
074 T000300 174899
074 U010300 174977
074 U020300 0
074 V010300 1.00
074 V020300 0.00
074 W000300 0.9999
074 X000300 100
074 Y000300 0
075 A000300 206543
075 B000300 0
076 000300 0.00
024 000400 Y
025 A000401 GOLDMAN SACHS
025 B000401 13-5108880
025 C000401 D
025 D000401 8000
025 A000402 LEHMAN BROTHERS INC.
025 B000402 13-2518466
025 C000402 D
025 D000402 8000
025 A000403 MERRILL LYNCH, PIERCE, FENNER & SMITH
025 B000403 13-5674085
025 C000403 D
025 D000403 8000
025 A000404 MORGAN STANLEY & CO., INC.
025 B000404 13-2655998
025 C000404 D
025 D000404 8000
025 A000405 PRUDENTIAL SECURITIES INC.
025 B000405 22-2347336
<PAGE> PAGE 18
025 C000405 D
025 D000405 8000
025 D000406 0
025 D000407 0
025 D000408 0
028 A010400 58145
028 A020400 793
028 A030400 0
028 A040400 37027
028 B010400 51044
028 B020400 701
028 B030400 0
028 B040400 57903
028 C010400 47775
028 C020400 758
028 C030400 0
028 C040400 47736
028 D010400 123451
028 D020400 913
028 D030400 0
028 D040400 77184
028 E010400 58842
028 E020400 770
028 E030400 0
028 E040400 87800
028 F010400 67389
028 F020400 835
028 F030400 0
028 F040400 78826
028 G010400 406646
028 G020400 4770
028 G030400 0
028 G040400 386476
028 H000400 0
045 000400 Y
046 000400 N
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
048 G010400 0
<PAGE> PAGE 19
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 6.2
062 C000400 68.1
062 D000400 25.0
062 E000400 0.0
062 F000400 0.0
062 G000400 0.0
062 H000400 0.0
062 I000400 0.0
062 J000400 0.0
062 K000400 0.0
062 L000400 0.0
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 38
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
070 J020400 N
<PAGE> PAGE 20
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 5256
072 C000400 0
072 D000400 0
072 E000400 0
072 F000400 438
072 G000400 0
072 H000400 0
072 I000400 11
072 J000400 34
072 K000400 0
072 L000400 2
072 M000400 2
072 N000400 55
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 5
072 X000400 555
072 Y000400 69
072 Z000400 4770
072AA000400 0
072BB000400 0
072CC010400 0
072CC020400 0
072DD010400 4770
<PAGE> PAGE 21
072DD020400 0
072EE000400 0
073 A010400 0.0246
073 A020400 0.0000
073 B000400 0.0000
073 C000400 0.0000
074 A000400 53
074 B000400 48700
074 C000400 145024
074 D000400 0
074 E000400 0
074 F000400 0
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 0
074 K000400 15
074 L000400 1298
074 M000400 0
074 N000400 195090
074 O000400 0
074 P000400 78
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 7
074 S000400 0
074 T000400 195005
074 U010400 195057
074 U020400 0
074 V010400 1.00
074 V020400 0.00
074 W000400 0.9998
074 X000400 1253
074 Y000400 0
075 A000400 193137
075 B000400 0
076 000400 0.00
SIGNATURE CATHY WHITE
TITLE ASST VICE PRESIDENT
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES, INC.
<SERIES>
<NUMBER> 01
<NAME> PRIME PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> APR-30-1997
<PERIOD-START> MAY-01-1996
<PERIOD-END> OCT-31-1996
<INVESTMENTS-AT-COST> 633,431,107
<INVESTMENTS-AT-VALUE> 633,431,107
<RECEIVABLES> 3,243,834
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 636,674,941
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 7,056,702
<TOTAL-LIABILITIES> 7,056,702
<SENIOR-EQUITY> 6,298,084
<PAID-IN-CAPITAL-COMMON> 623,510,341
<SHARES-COMMON-STOCK> 629,808,425
<SHARES-COMMON-PRIOR> 493,504,955
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (190,186)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 629,618,239
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 16,862,626
<OTHER-INCOME> 0
<EXPENSES-NET> (616,027)
<NET-INVESTMENT-INCOME> 16,246,599
<REALIZED-GAINS-CURRENT> (4,454)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 16,242,145
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (16,246,599)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,295,342,088
<NUMBER-OF-SHARES-REDEEMED> (5,175,285,217)
<SHARES-REINVESTED> 16,246,599
<NET-CHANGE-IN-ASSETS> 136,299,016
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (185,732)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 616,000
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 810,000
<AVERAGE-NET-ASSETS> 611,005,432
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.20
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES, INC.
<SERIES>
<NUMBER> 02
<NAME> GOVERNMENT PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> APR-30-1997
<PERIOD-START> MAY-01-1996
<PERIOD-END> OCT-31-1996
<INVESTMENTS-AT-COST> 164,510,957
<INVESTMENTS-AT-VALUE> 164,510,957
<RECEIVABLES> 1,154,102
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 165,665,059
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 102,951
<TOTAL-LIABILITIES> 102,951
<SENIOR-EQUITY> 1,656,937
<PAID-IN-CAPITAL-COMMON> 164,036,727
<SHARES-COMMON-STOCK> 165,693,664
<SHARES-COMMON-PRIOR> 150,945,387
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (131,556)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 165,562,108
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4,636,128
<OTHER-INCOME> 0
<EXPENSES-NET> (171,759)
<NET-INVESTMENT-INCOME> 4,464,369
<REALIZED-GAINS-CURRENT> (2,347)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 4,462,022
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,464,369)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 476,595,643
<NUMBER-OF-SHARES-REDEEMED> (466,311,735)
<SHARES-REINVESTED> 4,464,369
<NET-CHANGE-IN-ASSETS> 14,745,930
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (129,209)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 172,000
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 277,000
<AVERAGE-NET-ASSETS> 170,358,838
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.20
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES, INC.
<SERIES>
<NUMBER> 03
<NAME> TAX FREE PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> APR-30-1997
<PERIOD-START> MAY-01-1996
<PERIOD-END> OCT-31-1996
<INVESTMENTS-AT-COST> 174,936,166
<INVESTMENTS-AT-VALUE> 174,937,638
<RECEIVABLES> 957,613
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 175,895,251
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 996,245
<TOTAL-LIABILITIES> 996,245
<SENIOR-EQUITY> 1,749,772
<PAID-IN-CAPITAL-COMMON> 173,227,445
<SHARES-COMMON-STOCK> 174,977,217
<SHARES-COMMON-PRIOR> 183,695,120
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (79,683)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,472
<NET-ASSETS> 174,899,006
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,829,282
<OTHER-INCOME> 0
<EXPENSES-NET> (208,240)
<NET-INVESTMENT-INCOME> 3,621,042
<REALIZED-GAINS-CURRENT> 3,890
<APPREC-INCREASE-CURRENT> 1,350
<NET-CHANGE-FROM-OPS> 3,626,282
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,621,042)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 834,125,594
<NUMBER-OF-SHARES-REDEEMED> (846,464,539)
<SHARES-REINVESTED> 3,621,042
<NET-CHANGE-IN-ASSETS> (8,712,663)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (83,573)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 208,000
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 333,000
<AVERAGE-NET-ASSETS> 206,542,518
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.20
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000862021
<NAME> ACM INSTITUTIONAL RESERVES, INC.
<SERIES>
<NUMBER> 04
<NAME> TRUST PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> APR-30-1997
<PERIOD-START> MAY-01-1996
<PERIOD-END> OCT-31-1996
<INVESTMENTS-AT-COST> 193,724,446
<INVESTMENTS-AT-VALUE> 193,724,446
<RECEIVABLES> 1,312,215
<ASSETS-OTHER> 53,296
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 195,089,957
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 85,175
<TOTAL-LIABILITIES> 85,175
<SENIOR-EQUITY> 1,950,574
<PAID-IN-CAPITAL-COMMON> 193,106,801
<SHARES-COMMON-STOCK> 195,057,375
<SHARES-COMMON-PRIOR> 170,118,302
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (52,593)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 195,004,782
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5,256,353
<OTHER-INCOME> 0
<EXPENSES-NET> (486,811)
<NET-INVESTMENT-INCOME> 4,769,542
<REALIZED-GAINS-CURRENT> 287
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 4,769,829
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,769,542)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 406,645,991
<NUMBER-OF-SHARES-REDEEMED> (386,476,460)
<SHARES-REINVESTED> 4,769,542
<NET-CHANGE-IN-ASSETS> 24,939,360
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (52,880)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 438,000
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 555,000
<AVERAGE-NET-ASSETS> 193,136,890
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.50
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>