WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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-30-2001
<PERIOD-START> MAY-01-2000
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 285,444,059
<INVESTMENTS-AT-VALUE> 285,444,059
<RECEIVABLES> 720,246
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 286,164,305
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 279,762
<TOTAL-LIABILITIES> 279,762
<SENIOR-EQUITY> 2,858,792
<PAID-IN-CAPITAL-COMMON> 283,020,359
<SHARES-COMMON-STOCK> 271,231,466
<SHARES-COMMON-PRIOR> 349,911,383
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,544
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 285,884,543
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 8,720,856
<OTHER-INCOME> 0
<EXPENSES-NET> (607,337)
<NET-INVESTMENT-INCOME> 8,113,519
<REALIZED-GAINS-CURRENT> 1,087
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 8,114,606
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (7,369,996)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 583,782,556
<NUMBER-OF-SHARES-REDEEMED> (669,832,469)
<SHARES-REINVESTED> 7,369,996
<NET-CHANGE-IN-ASSETS> (153,289,088)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 4,306
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 280,000
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 747,000
<AVERAGE-NET-ASSETS> 252,588,480
<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> .45
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>