<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 27
<NAME> INTERMEDIATE DURATION PORTFOLIO, INVESTMENT 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> 82,380
<INVESTMENTS-AT-VALUE> 81,463
<RECEIVABLES> 2,471
<ASSETS-OTHER> 7
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 83,941
<PAYABLE-FOR-SECURITIES> 18,294
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 283
<TOTAL-LIABILITIES> 18,577
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 69,595
<SHARES-COMMON-STOCK> 2,865
<SHARES-COMMON-PRIOR> 952
<ACCUMULATED-NII-CURRENT> 71
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (3,267)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1,035)
<NET-ASSETS> 65,364
<DIVIDEND-INCOME> 38
<INTEREST-INCOME> 4,300
<OTHER-INCOME> 0
<EXPENSES-NET> (329)
<NET-INVESTMENT-INCOME> 4,009
<REALIZED-GAINS-CURRENT> (957)
<APPREC-INCREASE-CURRENT> 189
<NET-CHANGE-FROM-OPS> 3,241
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,060)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,048
<NUMBER-OF-SHARES-REDEEMED> (246)
<SHARES-REINVESTED> 111
<NET-CHANGE-IN-ASSETS> 5,547
<ACCUMULATED-NII-PRIOR> 135
<ACCUMULATED-GAINS-PRIOR> (2,386)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 217
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 337
<AVERAGE-NET-ASSETS> 58,006
<PER-SHARE-NAV-BEGIN> 9.77
<PER-SHARE-NII> 0.65
<PER-SHARE-GAIN-APPREC> (0.23)
<PER-SHARE-DIVIDEND> (0.53)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.66
<EXPENSE-RATIO> 0.69
</TABLE>
