<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 061
<NAME> DOMESTIC FIXED INCOME 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> 252,121
<INVESTMENTS-AT-VALUE> 248,616
<RECEIVABLES> 7,038
<ASSETS-OTHER> 12
<OTHER-ITEMS-ASSETS> 16,054
<TOTAL-ASSETS> 271,720
<PAYABLE-FOR-SECURITIES> 68,686
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19,525
<TOTAL-LIABILITIES> 88,211
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 191,703
<SHARES-COMMON-STOCK> 17,382
<SHARES-COMMON-PRIOR> 18,003
<ACCUMULATED-NII-CURRENT> 3,136
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,473)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2,857)
<NET-ASSETS> 183,509
<DIVIDEND-INCOME> 70
<INTEREST-INCOME> 13,011
<OTHER-INCOME> 0
<EXPENSES-NET> (890)
<NET-INVESTMENT-INCOME> 12,191
<REALIZED-GAINS-CURRENT> (3,941)
<APPREC-INCREASE-CURRENT> 1,974
<NET-CHANGE-FROM-OPS> 10,224
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11,589)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,028
<NUMBER-OF-SHARES-REDEEMED> (3,756)
<SHARES-REINVESTED> 1,107
<NET-CHANGE-IN-ASSETS> (7,543)
<ACCUMULATED-NII-PRIOR> 2,949
<ACCUMULATED-GAINS-PRIOR> (4,676)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 664
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 902
<AVERAGE-NET-ASSETS> 177,286
<PER-SHARE-NAV-BEGIN> 10.55
<PER-SHARE-NII> 0.71
<PER-SHARE-GAIN-APPREC> (0.12)
<PER-SHARE-DIVIDEND> (0.68)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.46
<EXPENSE-RATIO> 0.51
</TABLE>
