WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
x<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 33
<NAME> SMALL CAP GROWTH PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 349,389
<INVESTMENTS-AT-VALUE> 442,805
<RECEIVABLES> 13,738
<ASSETS-OTHER> 6
<OTHER-ITEMS-ASSETS> 2,262
<TOTAL-ASSETS> 458,811
<PAYABLE-FOR-SECURITIES> 17,515
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3,398
<TOTAL-LIABILITIES> 20,913
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 328,214
<SHARES-COMMON-STOCK> 8,269
<SHARES-COMMON-PRIOR> 2,889
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 16,268
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 93,416
<NET-ASSETS> 437,898
<DIVIDEND-INCOME> 325
<INTEREST-INCOME> 956
<OTHER-INCOME> 0
<EXPENSES-NET> 4,065
<NET-INVESTMENT-INCOME> (2,784)
<REALIZED-GAINS-CURRENT> 24,174
<APPREC-INCREASE-CURRENT> 81,574
<NET-CHANGE-FROM-OPS> 102,964
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (20,468)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10,932
<NUMBER-OF-SHARES-REDEEMED> (5,963)
<SHARES-REINVESTED> 412
<NET-CHANGE-IN-ASSETS> 344,669
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 15,346
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3,628
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,127
<AVERAGE-NET-ASSETS> 362,296
<PER-SHARE-NAV-BEGIN> 32.28
<PER-SHARE-NII> (0.34)
<PER-SHARE-GAIN-APPREC> 25.42
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (4.40)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 52.96
<EXPENSE-RATIO> 1.14
</TABLE>
