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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 18
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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<PAGE> PAGE 21
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<PAGE> PAGE 22
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<PAGE> PAGE 23
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<PAGE> PAGE 24
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<PAGE> PAGE 25
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 33
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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<PAGE> PAGE 42
037 002900 N
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025 B003001 13-2633612
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025 D003002 2871
025 A003003 DONALDSON LUFKIN & JENRETTE SECURITIES CORP.
025 B003003 13-2747129
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025 A003004 CS FIRST BOSTON CORP.
025 B003004 13-5659485
025 C003004 D
025 D003004 32
<PAGE> PAGE 43
025 A003005 MERRILL LYNCH AND COF., INC.
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<PAGE> PAGE 44
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025 A003101 BEAR STEARNS & CO., INC.
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<PAGE> PAGE 45
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<PAGE> PAGE 46
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<PAGE> PAGE 47
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<PAGE> PAGE 48
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<PAGE> PAGE 49
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SIGNATURE RICHARD SCHOCH
TITLE ASSISTANT SECRETARY
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
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<CIK> 0000741375
<NAME> MAS FUNDS
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
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[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 13
<NAME> CASH RESERVES PORTFOLIO
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<S> <C>
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<OVERDIST-NET-GAINS-PRIOR> 0
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[AVG-DEBT-OUTSTANDING] 0
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<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> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 252,098
<INVESTMENTS-AT-VALUE> 251,811
<RECEIVABLES> 8,503
<ASSETS-OTHER> 5
<OTHER-ITEMS-ASSETS> 37
<TOTAL-ASSETS> 260,356
<PAYABLE-FOR-SECURITIES> 90,958
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,141
<TOTAL-LIABILITIES> 101,099
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 159,119
<SHARES-COMMON-STOCK> 14,458
<SHARES-COMMON-PRIOR> 6,672
<ACCUMULATED-NII-CURRENT> 2,401
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,127)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (136)
<NET-ASSETS> 159,257
<DIVIDEND-INCOME> 46
<INTEREST-INCOME> 3,930
<OTHER-INCOME> 0
<EXPENSES-NET> (303)
<NET-INVESTMENT-INCOME> 3,673
<REALIZED-GAINS-CURRENT> (1,910)
<APPREC-INCREASE-CURRENT> (1,863)
<NET-CHANGE-FROM-OPS> (100)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,994)
<DISTRIBUTIONS-OF-GAINS> (2,430)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 9,744
<NUMBER-OF-SHARES-REDEEMED> (2,334)
<SHARES-REINVESTED> 376
<NET-CHANGE-IN-ASSETS> 83,215
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 229
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 322
<AVERAGE-NET-ASSETS> 122,932
<PER-SHARE-NAV-BEGIN> 11.40
<PER-SHARE-NII> 0.30
<PER-SHARE-GAIN-APPREC> (0.29)
<PER-SHARE-DIVIDEND> (0.24)
<PER-SHARE-DISTRIBUTIONS> (0.21)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.96
<EXPENSE-RATIO> 0.53
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 062
<NAME> DOMESTIC FIXED INCOME PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 252,098
<INVESTMENTS-AT-VALUE> 251,811
<RECEIVABLES> 8,503
<ASSETS-OTHER> 5
<OTHER-ITEMS-ASSETS> 37
<TOTAL-ASSETS> 260,356
<PAYABLE-FOR-SECURITIES> 90,958
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 10,141
<TOTAL-LIABILITIES> 101,099
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 159,119
<SHARES-COMMON-STOCK> 68
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 2,401
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,127)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (136)
<NET-ASSETS> 159,257
<DIVIDEND-INCOME> 46
<INTEREST-INCOME> 3,930
<OTHER-INCOME> 0
<EXPENSES-NET> (303)
<NET-INVESTMENT-INCOME> 3,673
<REALIZED-GAINS-CURRENT> (1,910)
<APPREC-INCREASE-CURRENT> (1,863)
<NET-CHANGE-FROM-OPS> (100)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 84
<NUMBER-OF-SHARES-REDEEMED> (16)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 83,215
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 229
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 322
<AVERAGE-NET-ASSETS> 122,932
<PER-SHARE-NAV-BEGIN> 10.85
<PER-SHARE-NII> 0.10
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.96
<EXPENSE-RATIO> 0.76
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 011
<NAME> EQUITY PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 720,589
<INVESTMENTS-AT-VALUE> 899,733
<RECEIVABLES> 31,402
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 72
<TOTAL-ASSETS> 931,207
<PAYABLE-FOR-SECURITIES> 15,955
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 74,278
<TOTAL-LIABILITIES> 90,233
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 569,208
<SHARES-COMMON-STOCK> 42,272
<SHARES-COMMON-PRIOR> 42,692
<ACCUMULATED-NII-CURRENT> 1,241
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 91,381
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 179,144
<NET-ASSETS> 840,974
<DIVIDEND-INCOME> 5,636
<INTEREST-INCOME> 501
<OTHER-INCOME> 0
<EXPENSES-NET> (2,632)
<NET-INVESTMENT-INCOME> 3,505
<REALIZED-GAINS-CURRENT> 98,440
<APPREC-INCREASE-CURRENT> 131,985
<NET-CHANGE-FROM-OPS> 233,930
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,390)
<DISTRIBUTIONS-OF-GAINS> (222,761)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,147
<NUMBER-OF-SHARES-REDEEMED> (15,964)
<SHARES-REINVESTED> 12,397
<NET-CHANGE-IN-ASSETS> (34,090)
<ACCUMULATED-NII-PRIOR> 2,137
<ACCUMULATED-GAINS-PRIOR> 216,435
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,218
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,694
<AVERAGE-NET-ASSETS> 889,827
<PER-SHARE-NAV-BEGIN> 20.44
<PER-SHARE-NII> 0.09
<PER-SHARE-GAIN-APPREC> 5.25
<PER-SHARE-DIVIDEND> (0.11)
<PER-SHARE-DISTRIBUTIONS> (5.83)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.84
<EXPENSE-RATIO> 0.61
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 012
<NAME> EQUITY PORTFOLIO, INVESTMENT CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 720,589
<INVESTMENTS-AT-VALUE> 899,733
<RECEIVABLES> 31,402
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 72
<TOTAL-ASSETS> 931,207
<PAYABLE-FOR-SECURITIES> 15,955
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 74,278
<TOTAL-LIABILITIES> 90,233
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 569,208
<SHARES-COMMON-STOCK> 53,009
<SHARES-COMMON-PRIOR> 99,354
<ACCUMULATED-NII-CURRENT> 1,241
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 91,381
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 179,144
<NET-ASSETS> 840,974
<DIVIDEND-INCOME> 5,636
<INTEREST-INCOME> 501
<OTHER-INCOME> 0
<EXPENSES-NET> (2,632)
<NET-INVESTMENT-INCOME> 3,505
<REALIZED-GAINS-CURRENT> 98,440
<APPREC-INCREASE-CURRENT> 131,985
<NET-CHANGE-FROM-OPS> 233,930
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (9)
<DISTRIBUTIONS-OF-GAINS> (609)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6
<NUMBER-OF-SHARES-REDEEMED> (87)
<SHARES-REINVESTED> 35
<NET-CHANGE-IN-ASSETS> (34,090)
<ACCUMULATED-NII-PRIOR> 2,137
<ACCUMULATED-GAINS-PRIOR> 216,435
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,218
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,694
<AVERAGE-NET-ASSETS> 889,827
<PER-SHARE-NAV-BEGIN> 20.42
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 5.29
<PER-SHARE-DIVIDEND> (0.09)
<PER-SHARE-DISTRIBUTIONS> (5.83)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.83
<EXPENSE-RATIO> 0.76
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 013
<NAME> EQUITY PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 720,589
<INVESTMENTS-AT-VALUE> 899,733
<RECEIVABLES> 31,402
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 72
<TOTAL-ASSETS> 931,207
<PAYABLE-FOR-SECURITIES> 15,955
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 74,278
<TOTAL-LIABILITIES> 90,233
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 569,208
<SHARES-COMMON-STOCK> 54,618
<SHARES-COMMON-PRIOR> 18,246
<ACCUMULATED-NII-CURRENT> 1,241
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 91,381
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 179,144
<NET-ASSETS> 840,974
<DIVIDEND-INCOME> 5,636
<INTEREST-INCOME> 501
<OTHER-INCOME> 0
<EXPENSES-NET> (2,632)
<NET-INVESTMENT-INCOME> 3,505
<REALIZED-GAINS-CURRENT> 98,440
<APPREC-INCREASE-CURRENT> 131,985
<NET-CHANGE-FROM-OPS> 233,930
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2)
<DISTRIBUTIONS-OF-GAINS> (124)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 30
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 7
<NET-CHANGE-IN-ASSETS> (34,090)
<ACCUMULATED-NII-PRIOR> 2,137
<ACCUMULATED-GAINS-PRIOR> 216,435
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,218
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,694
<AVERAGE-NET-ASSETS> 889,827
<PER-SHARE-NAV-BEGIN> 20.42
<PER-SHARE-NII> 0.07
<PER-SHARE-GAIN-APPREC> 5.25
<PER-SHARE-DIVIDEND> (0.08)
<PER-SHARE-DISTRIBUTIONS> (5.83)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.83
<EXPENSE-RATIO> 0.85
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 14
<NAME> FIXED INCOME PORTFOLIO II
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 636,105
<INVESTMENTS-AT-VALUE> 633,235
<RECEIVABLES> 19,724
<ASSETS-OTHER> 14
<OTHER-ITEMS-ASSETS> 111
<TOTAL-ASSETS> 653,084
<PAYABLE-FOR-SECURITIES> 183,567
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 55,303
<TOTAL-LIABILITIES> 238,870
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 412,198
<SHARES-COMMON-STOCK> 36,948
<SHARES-COMMON-PRIOR> 37,973
<ACCUMULATED-NII-CURRENT> 7,926
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (3,339)
<ACCUM-APPREC-OR-DEPREC> (2,571)
<NET-ASSETS> 414,214
<DIVIDEND-INCOME> 142
<INTEREST-INCOME> 13,657
<OTHER-INCOME> 0
<EXPENSES-NET> (971)
<NET-INVESTMENT-INCOME> 12,828
<REALIZED-GAINS-CURRENT> (2,086)
<APPREC-INCREASE-CURRENT> (8,111)
<NET-CHANGE-FROM-OPS> 2,631
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11,026)
<DISTRIBUTIONS-OF-GAINS> (9,302)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,387
<NUMBER-OF-SHARES-REDEEMED> (3,967)
<SHARES-REINVESTED> 1,556
<NET-CHANGE-IN-ASSETS> (29,709)
<ACCUMULATED-NII-PRIOR> 6,124
<ACCUMULATED-GAINS-PRIOR> 810496
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 776
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 977
<AVERAGE-NET-ASSETS> 414,876
<PER-SHARE-NAV-BEGIN> 11.69
<PER-SHARE-NII> 0.35
<PER-SHARE-GAIN-APPREC> (0.27)
<PER-SHARE-DIVIDEND> (0.30)
<PER-SHARE-DISTRIBUTIONS> (0.26)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.21
<EXPENSE-RATIO> 0.47
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 021
<NAME> FIXED INCOME PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 7,008,249
<INVESTMENTS-AT-VALUE> 6,955,105
<RECEIVABLES> 207,023
<ASSETS-OTHER> 165
<OTHER-ITEMS-ASSETS> 1,339
<TOTAL-ASSETS> 7,163,632
<PAYABLE-FOR-SECURITIES> 1,998,615
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 339,458
<TOTAL-LIABILITIES> 2,338,073
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,842,000
<SHARES-COMMON-STOCK> 396,075
<SHARES-COMMON-PRIOR> 378,558
<ACCUMULATED-NII-CURRENT> 83,926
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (46,772)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (53,595)
<NET-ASSETS> 4,825,559
<DIVIDEND-INCOME> 2,611
<INTEREST-INCOME> 164,644
<OTHER-INCOME> 0
<EXPENSES-NET> (11,431)
<NET-INVESTMENT-INCOME> 155,824
<REALIZED-GAINS-CURRENT> (30,231)
<APPREC-INCREASE-CURRENT> (52,863)
<NET-CHANGE-FROM-OPS> 72,730
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (136,916)
<DISTRIBUTIONS-OF-GAINS> (112,821)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 46,801
<NUMBER-OF-SHARES-REDEEMED> (48,776)
<SHARES-REINVESTED> 19,492
<NET-CHANGE-IN-ASSETS> 20,297
<ACCUMULATED-NII-PRIOR> 70,218
<ACCUMULATED-GAINS-PRIOR> 100,698
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,065
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11,535
<AVERAGE-NET-ASSETS> 4,845,312
<PER-SHARE-NAV-BEGIN> 12.22
<PER-SHARE-NII> 0.39
<PER-SHARE-GAIN-APPREC> (0.21)
<PER-SHARE-DIVIDEND> (0.36)
<PER-SHARE-DISTRIBUTIONS> (0.30)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.74
<EXPENSE-RATIO> 0.47
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 022
<NAME> FIXED INCOME PORTFOLIO, INVESTMENT CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 7,008,249
<INVESTMENTS-AT-VALUE> 6,955,105
<RECEIVABLES> 207,023
<ASSETS-OTHER> 165
<OTHER-ITEMS-ASSETS> 1,339
<TOTAL-ASSETS> 7,163,632
<PAYABLE-FOR-SECURITIES> 1,998,615
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 339,458
<TOTAL-LIABILITIES> 2,338,073
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,842,000
<SHARES-COMMON-STOCK> 3,172
<SHARES-COMMON-PRIOR> 4,004
<ACCUMULATED-NII-CURRENT> 83,926
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (46,772)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (53,595)
<NET-ASSETS> 4,825,559
<DIVIDEND-INCOME> 2,611
<INTEREST-INCOME> 164,644
<OTHER-INCOME> 0
<EXPENSES-NET> (11,431)
<NET-INVESTMENT-INCOME> 155,824
<REALIZED-GAINS-CURRENT> (30,231)
<APPREC-INCREASE-CURRENT> (52,863)
<NET-CHANGE-FROM-OPS> 72,730
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,374)
<DISTRIBUTIONS-OF-GAINS> (1,138)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,263
<NUMBER-OF-SHARES-REDEEMED> (2,263)
<SHARES-REINVESTED> 168
<NET-CHANGE-IN-ASSETS> 20,297
<ACCUMULATED-NII-PRIOR> 70,218
<ACCUMULATED-GAINS-PRIOR> 100,698
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,065
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11,535
<AVERAGE-NET-ASSETS> 4,845,312
<PER-SHARE-NAV-BEGIN> 12.22
<PER-SHARE-NII> 0.37
<PER-SHARE-GAIN-APPREC> (0.19)
<PER-SHARE-DIVIDEND> (0.35)
<PER-SHARE-DISTRIBUTIONS> (0.30)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.75
<EXPENSE-RATIO> 0.62
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 023
<NAME> FIXED INCOME PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 7,008,249
<INVESTMENTS-AT-VALUE> 6,955,105
<RECEIVABLES> 207,023
<ASSETS-OTHER> 165
<OTHER-ITEMS-ASSETS> 1,339
<TOTAL-ASSETS> 7,163,632
<PAYABLE-FOR-SECURITIES> 1,998,615
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 339,458
<TOTAL-LIABILITIES> 2,338,073
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,842,000
<SHARES-COMMON-STOCK> 11,719
<SHARES-COMMON-PRIOR> 10,739
<ACCUMULATED-NII-CURRENT> 83,926
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (46,772)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (53,595)
<NET-ASSETS> 4,825,559
<DIVIDEND-INCOME> 2,611
<INTEREST-INCOME> 164,644
<OTHER-INCOME> 0
<EXPENSES-NET> (11,431)
<NET-INVESTMENT-INCOME> 155,824
<REALIZED-GAINS-CURRENT> (30,231)
<APPREC-INCREASE-CURRENT> (52,863)
<NET-CHANGE-FROM-OPS> 72,730
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,826)
<DISTRIBUTIONS-OF-GAINS> (3,280)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,632
<NUMBER-OF-SHARES-REDEEMED> (1,099)
<SHARES-REINVESTED> 448
<NET-CHANGE-IN-ASSETS> 20,297
<ACCUMULATED-NII-PRIOR> 70,218
<ACCUMULATED-GAINS-PRIOR> 100,698
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,065
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11,535
<AVERAGE-NET-ASSETS> 4,845,312
<PER-SHARE-NAV-BEGIN> 12.23
<PER-SHARE-NII> 0.37
<PER-SHARE-GAIN-APPREC> (0.20)
<PER-SHARE-DIVIDEND> (0.35)
<PER-SHARE-DISTRIBUTIONS> (0.30)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.75
<EXPENSE-RATIO> 0.72
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 23
<NAME> GLOBAL FIXED INCOME PORTFOLIO
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 66,362
<INVESTMENTS-AT-VALUE> 64,964
<RECEIVABLES> 2,271
<ASSETS-OTHER> 4
<OTHER-ITEMS-ASSETS> 87
<TOTAL-ASSETS> 67,326
<PAYABLE-FOR-SECURITIES> 836
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 786
<TOTAL-LIABILITIES> 1,622
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 65,302
<SHARES-COMMON-STOCK> 6,251
<SHARES-COMMON-PRIOR> 6,513
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1,105)
<ACCUMULATED-NET-GAINS> 3,075
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1,568)
<NET-ASSETS> 65,704
<DIVIDEND-INCOME> 68
<INTEREST-INCOME> 1,816
<OTHER-INCOME> 0
<EXPENSES-NET> (184)
<NET-INVESTMENT-INCOME> 1,700
<REALIZED-GAINS-CURRENT> 3,144
<APPREC-INCREASE-CURRENT> (4,104)
<NET-CHANGE-FROM-OPS> 740
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2,797)
<DISTRIBUTIONS-OF-GAINS> (1,208)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 434
<NUMBER-OF-SHARES-REDEEMED> (1,023)
<SHARES-REINVESTED> 327
<NET-CHANGE-IN-ASSETS> (6,130)
<ACCUMULATED-NII-PRIOR>
<ACCUMULATED-GAINS-PRIOR> 1,139
<OVERDISTRIB-NII-PRIOR> (8)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 131
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 185
<AVERAGE-NET-ASSETS> 69,670
<PER-SHARE-NAV-BEGIN> 11.03
<PER-SHARE-NII> 0.26
<PER-SHARE-GAIN-APPREC> (0.15)
<PER-SHARE-DIVIDEND> (0.44)
<PER-SHARE-DISTRIBUTIONS> (0.19)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.51
<EXPENSE-RATIO> 0.53
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 101
<NAME> HIGH YIELD PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 992,251
<INVESTMENTS-AT-VALUE> 971,057
<RECEIVABLES> 23,102
<ASSETS-OTHER> 28
<OTHER-ITEMS-ASSETS> 3,420
<TOTAL-ASSETS> 997,607
<PAYABLE-FOR-SECURITIES> 6,942
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,119
<TOTAL-LIABILITIES> 9,061
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 995,396
<SHARES-COMMON-STOCK> 105,317
<SHARES-COMMON-PRIOR> 78,180
<ACCUMULATED-NII-CURRENT> 21,758
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,102)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (18,506)
<NET-ASSETS> 988,546
<DIVIDEND-INCOME> 42,550
<INTEREST-INCOME> 154
<OTHER-INCOME> 0
<EXPENSES-NET> (2,007)
<NET-INVESTMENT-INCOME> 40,697
<REALIZED-GAINS-CURRENT> (8,164)
<APPREC-INCREASE-CURRENT> 40,247
<NET-CHANGE-FROM-OPS> 72,780
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (34,227)
<DISTRIBUTIONS-OF-GAINS> (17,535)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 42,225
<NUMBER-OF-SHARES-REDEEMED> (19,227)
<SHARES-REINVESTED> 4,139
<NET-CHANGE-IN-ASSETS> 263,938
<ACCUMULATED-NII-PRIOR> 16,074
<ACCUMULATED-GAINS-PRIOR> 15,950
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,586
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,037
<AVERAGE-NET-ASSETS> 847,699
<PER-SHARE-NAV-BEGIN> 8.99
<PER-SHARE-NII> 0.40
<PER-SHARE-GAIN-APPREC> 0.36
<PER-SHARE-DIVIDEND> (0.40)
<PER-SHARE-DISTRIBUTIONS> (0.19)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.16
<EXPENSE-RATIO> 0.48
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 102
<NAME> HIGH YIELD PORTFOLIO, INVESTMENT CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 992,251
<INVESTMENTS-AT-VALUE> 971,057
<RECEIVABLES> 23,102
<ASSETS-OTHER> 28
<OTHER-ITEMS-ASSETS> 3,420
<TOTAL-ASSETS> 997,607
<PAYABLE-FOR-SECURITIES> 6,942
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,119
<TOTAL-LIABILITIES> 9,061
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 995,396
<SHARES-COMMON-STOCK> 865
<SHARES-COMMON-PRIOR> 1,251
<ACCUMULATED-NII-CURRENT> 21,758
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,102)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (18,506)
<NET-ASSETS> 988,546
<DIVIDEND-INCOME> 42,550
<INTEREST-INCOME> 154
<OTHER-INCOME> 0
<EXPENSES-NET> (2,007)
<NET-INVESTMENT-INCOME> 40,697
<REALIZED-GAINS-CURRENT> (8,164)
<APPREC-INCREASE-CURRENT> 40,247
<NET-CHANGE-FROM-OPS> 72,780
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (397)
<DISTRIBUTIONS-OF-GAINS> (168)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 389
<NUMBER-OF-SHARES-REDEEMED> (834)
<SHARES-REINVESTED> 59
<NET-CHANGE-IN-ASSETS> 263,938
<ACCUMULATED-NII-PRIOR> 16,074
<ACCUMULATED-GAINS-PRIOR> 15,950
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,586
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,037
<AVERAGE-NET-ASSETS> 847,699
<PER-SHARE-NAV-BEGIN> 9.00
<PER-SHARE-NII> 0.59
<PER-SHARE-GAIN-APPREC> 0.17
<PER-SHARE-DIVIDEND> (0.39)
<PER-SHARE-DISTRIBUTIONS> (0.19)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.18
<EXPENSE-RATIO> 0.63
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 29
<NAME> ADVISORY FOREIGN FIXED INCOME PORTFOLIO
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 13,481
<INVESTMENTS-AT-VALUE> 13,667
<RECEIVABLES> 268
<ASSETS-OTHER> 14
<OTHER-ITEMS-ASSETS> 698
<TOTAL-ASSETS> 14,647
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 15
<TOTAL-LIABILITIES> 34
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,930
<SHARES-COMMON-STOCK> 3,796
<SHARES-COMMON-PRIOR> 1,737
<ACCUMULATED-NII-CURRENT> (456)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 475
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 649
<NET-ASSETS> 14,598
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 334
<OTHER-INCOME> 0
<EXPENSES-NET> (11)
<NET-INVESTMENT-INCOME> 323
<REALIZED-GAINS-CURRENT> 484
<APPREC-INCREASE-CURRENT> (375)
<NET-CHANGE-FROM-OPS> 432
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (9,526)
<DISTRIBUTIONS-OF-GAINS> (1,724)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (173)
<SHARES-REINVESTED> 2,232
<NET-CHANGE-IN-ASSETS> (3,085)
<ACCUMULATED-NII-PRIOR> 8,747
<ACCUMULATED-GAINS-PRIOR> 1,715
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 29
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 12
<AVERAGE-NET-ASSETS> 15,574
<PER-SHARE-NAV-BEGIN> 10.18
<PER-SHARE-NII> 0.11
<PER-SHARE-GAIN-APPREC> 0.08
<PER-SHARE-DIVIDEND> (5.52)
<PER-SHARE-DISTRIBUTIONS> (1.00)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 3.85
<EXPENSE-RATIO> 0.16
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 103
<NAME> HIGH YIELD PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 992,251
<INVESTMENTS-AT-VALUE> 971,057
<RECEIVABLES> 23,102
<ASSETS-OTHER> 28
<OTHER-ITEMS-ASSETS> 3,420
<TOTAL-ASSETS> 997,607
<PAYABLE-FOR-SECURITIES> 6,942
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,119
<TOTAL-LIABILITIES> 9,061
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 995,396
<SHARES-COMMON-STOCK> 1,693
<SHARES-COMMON-PRIOR> 1,139
<ACCUMULATED-NII-CURRENT> 21,758
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,102)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (18,506)
<NET-ASSETS> 988,546
<DIVIDEND-INCOME> 42,550
<INTEREST-INCOME> 154
<OTHER-INCOME> 0
<EXPENSES-NET> (2,007)
<NET-INVESTMENT-INCOME> 40,697
<REALIZED-GAINS-CURRENT> (8,164)
<APPREC-INCREASE-CURRENT> 40,247
<NET-CHANGE-FROM-OPS> 72,780
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (389)
<DISTRIBUTIONS-OF-GAINS> (185)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,771
<NUMBER-OF-SHARES-REDEEMED> (1,275)
<SHARES-REINVESTED> 58
<NET-CHANGE-IN-ASSETS> 263,938
<ACCUMULATED-NII-PRIOR> 16,074
<ACCUMULATED-GAINS-PRIOR> 15,950
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,586
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,037
<AVERAGE-NET-ASSETS> 847,699
<PER-SHARE-NAV-BEGIN> 8.99
<PER-SHARE-NII> 0.46
<PER-SHARE-GAIN-APPREC> 0.28
<PER-SHARE-DIVIDEND> (0.38)
<PER-SHARE-DISTRIBUTIONS> (0.19)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.16
<EXPENSE-RATIO> 0.73
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 26
<NAME> INTERMEDIATE DURATION PORTFOLIO
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 127,739
<INVESTMENTS-AT-VALUE> 127,680
<RECEIVABLES> 4,674
<ASSETS-OTHER> 3
<OTHER-ITEMS-ASSETS> 20
<TOTAL-ASSETS> 132,377
<PAYABLE-FOR-SECURITIES> 32,302
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 257
<TOTAL-LIABILITIES> 32,559
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 100,311
<SHARES-COMMON-STOCK> 9,840
<SHARES-COMMON-PRIOR> 10,944
<ACCUMULATED-NII-CURRENT> 523
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,233)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 217
<NET-ASSETS> 99,818
<DIVIDEND-INCOME> 21
<INTEREST-INCOME> 3,518
<OTHER-INCOME> 0
<EXPENSES-NET> (265)
<NET-INVESTMENT-INCOME> 3,274
<REALIZED-GAINS-CURRENT> (643)
<APPREC-INCREASE-CURRENT> (1,383)
<NET-CHANGE-FROM-OPS> 1,248
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,567)
<DISTRIBUTIONS-OF-GAINS> (2,363)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 772
<NUMBER-OF-SHARES-REDEEMED> (2,324)
<SHARES-REINVESTED> 448
<NET-CHANGE-IN-ASSETS> (17,073)
<ACCUMULATED-NII-PRIOR> 1,816
<ACCUMULATED-GAINS-PRIOR> 1,773
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 204
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 267
<AVERAGE-NET-ASSETS> 108,713
<PER-SHARE-NAV-BEGIN> 10.68
<PER-SHARE-NII> 0.32
<PER-SHARE-GAIN-APPREC> (0.21)
<PER-SHARE-DIVIDEND> (0.43)
<PER-SHARE-DISTRIBUTIONS> (0.22)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.14
<EXPENSE-RATIO> 0.49
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 25
<NAME> INTERNATIONAL FIXED INCOME PORTFOLIO
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 119,950
<INVESTMENTS-AT-VALUE> 118,275
<RECEIVABLES> 4,176
<ASSETS-OTHER> 8
<OTHER-ITEMS-ASSETS> 2,415
<TOTAL-ASSETS> 124,874
<PAYABLE-FOR-SECURITIES> 1,696
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,589
<TOTAL-LIABILITIES> 4,285
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 121,986
<SHARES-COMMON-STOCK> 11,827
<SHARES-COMMON-PRIOR> 13,987
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (4,876)
<ACCUMULATED-NET-GAINS> 4,762
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1,283)
<NET-ASSETS> 120,589
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3,181
<OTHER-INCOME> 0
<EXPENSES-NET> (370)
<NET-INVESTMENT-INCOME> 2,811
<REALIZED-GAINS-CURRENT> 4,852
<APPREC-INCREASE-CURRENT> (7,763)
<NET-CHANGE-FROM-OPS> (100)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4,450)
<DISTRIBUTIONS-OF-GAINS> (2,919)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,114
<NUMBER-OF-SHARES-REDEEMED> (3,896)
<SHARES-REINVESTED> 622
<NET-CHANGE-IN-ASSETS> (29,724)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2,829
<OVERDISTRIB-NII-PRIOR> (3,237)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 268
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 371
<AVERAGE-NET-ASSETS> 143,397
<PER-SHARE-NAV-BEGIN> 10.75
<PER-SHARE-NII> 0.16
<PER-SHARE-GAIN-APPREC> (0.15)
<PER-SHARE-DIVIDEND> (0.34)
<PER-SHARE-DISTRIBUTIONS> (0.22)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.20
<EXPENSE-RATIO> 0.52
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 19
<NAME> LIMITED DURATION PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 241,339
<INVESTMENTS-AT-VALUE> 241,230
<RECEIVABLES> 55,507
<ASSETS-OTHER> 9
<OTHER-ITEMS-ASSETS> 130
<TOTAL-ASSETS> 296,876
<PAYABLE-FOR-SECURITIES> 98,235
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,145
<TOTAL-LIABILITIES> 99,380
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 200,658
<SHARES-COMMON-STOCK> 19,053
<SHARES-COMMON-PRIOR> 23,976
<ACCUMULATED-NII-CURRENT> 1,013
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (4,295)
<ACCUM-APPREC-OR-DEPREC> 120
<NET-ASSETS> 197,496
<DIVIDEND-INCOME> 58
<INTEREST-INCOME> 7,335
<OTHER-INCOME> 0
<EXPENSES-NET> (472)
<NET-INVESTMENT-INCOME> 6,921
<REALIZED-GAINS-CURRENT> (1,173)
<APPREC-INCREASE-CURRENT> (314)
<NET-CHANGE-FROM-OPS> 5,434
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (9,639)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 956
<NUMBER-OF-SHARES-REDEEMED> (6,736)
<SHARES-REINVESTED> 857
<NET-CHANGE-IN-ASSETS> (55,215)
<ACCUMULATED-NII-PRIOR> 3,731
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (3,122)
<GROSS-ADVISORY-FEES> 353
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 476
<AVERAGE-NET-ASSETS> 235,729
<PER-SHARE-NAV-BEGIN> 10.54
<PER-SHARE-NII> 0.32
<PER-SHARE-GAIN-APPREC> (0.07)
<PER-SHARE-DIVIDEND> (0.42)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.37
<EXPENSE-RATIO> 0.41
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 281
<NAME> MULTI-ASSET-CLASS PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 159,089
<INVESTMENTS-AT-VALUE> 173,533
<RECEIVABLES> 3,599
<ASSETS-OTHER> 9
<OTHER-ITEMS-ASSETS> 22,791
<TOTAL-ASSETS> 199,932
<PAYABLE-FOR-SECURITIES> 23,620
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 526
<TOTAL-LIABILITIES> 24,146
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 150,088
<SHARES-COMMON-STOCK> 13,500
<SHARES-COMMON-PRIOR> 14,054
<ACCUMULATED-NII-CURRENT> 1,304
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,185
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14,209
<NET-ASSETS> 175,786
<DIVIDEND-INCOME> 586
<INTEREST-INCOME> 2,575
<OTHER-INCOME> 0
<EXPENSES-NET> (700)
<NET-INVESTMENT-INCOME> 2,461
<REALIZED-GAINS-CURRENT> 10,533
<APPREC-INCREASE-CURRENT> 14,497
<NET-CHANGE-FROM-OPS> 27,491
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,956)
<DISTRIBUTIONS-OF-GAINS> (13,405)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 580
<NUMBER-OF-SHARES-REDEEMED> (2,387)
<SHARES-REINVESTED> 1,253
<NET-CHANGE-IN-ASSETS> 4,514
<ACCUMULATED-NII-PRIOR> 873
<ACCUMULATED-GAINS-PRIOR> 13,563
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 578
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 701
<AVERAGE-NET-ASSETS> 178,851
<PER-SHARE-NAV-BEGIN> 11.74
<PER-SHARE-NII> 0.17
<PER-SHARE-GAIN-APPREC> 1.68
<PER-SHARE-DIVIDEND> (0.14)
<PER-SHARE-DISTRIBUTIONS> (0.96)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.49
<EXPENSE-RATIO> 0.77
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 282
<NAME> MULTI-ASSET-CLASS PORTFOLIO, INVESTMENT CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 159,089
<INVESTMENTS-AT-VALUE> 173,533
<RECEIVABLES> 3,599
<ASSETS-OTHER> 9
<OTHER-ITEMS-ASSETS> 22,791
<TOTAL-ASSETS> 199,932
<PAYABLE-FOR-SECURITIES> 23,620
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 526
<TOTAL-LIABILITIES> 24,146
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 150,088
<SHARES-COMMON-STOCK> 570
<SHARES-COMMON-PRIOR> 531
<ACCUMULATED-NII-CURRENT> 1,304
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,185
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14,209
<NET-ASSETS> 175,786
<DIVIDEND-INCOME> 586
<INTEREST-INCOME> 2,575
<OTHER-INCOME> 0
<EXPENSES-NET> (700)
<NET-INVESTMENT-INCOME> 2,461
<REALIZED-GAINS-CURRENT> 10,533
<APPREC-INCREASE-CURRENT> 14,497
<NET-CHANGE-FROM-OPS> 27,491
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (74)
<DISTRIBUTIONS-OF-GAINS> (506)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4
<NUMBER-OF-SHARES-REDEEMED> (15)
<SHARES-REINVESTED> 50
<NET-CHANGE-IN-ASSETS> 4,514
<ACCUMULATED-NII-PRIOR> 873
<ACCUMULATED-GAINS-PRIOR> 13,563
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 578
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 701
<AVERAGE-NET-ASSETS> 178,851
<PER-SHARE-NAV-BEGIN> 11.74
<PER-SHARE-NII> 0.16
<PER-SHARE-GAIN-APPREC> 1.68
<PER-SHARE-DIVIDEND> (0.14)
<PER-SHARE-DISTRIBUTIONS> (0.96)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.48
<EXPENSE-RATIO> 0.92
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 121
<NAME> MID-CAP GROWTH PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 750,269
<INVESTMENTS-AT-VALUE> 868,887
<RECEIVABLES> 11,034
<ASSETS-OTHER> 26
<OTHER-ITEMS-ASSETS> 3
<TOTAL-ASSETS> 879,950
<PAYABLE-FOR-SECURITIES> 465
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 118,625
<TOTAL-LIABILITIES> 119,090
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 514,481
<SHARES-COMMON-STOCK> 26,583
<SHARES-COMMON-PRIOR> 23,090
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (571)
<ACCUMULATED-NET-GAINS> 128,332
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 118,618
<NET-ASSETS> 760,860
<DIVIDEND-INCOME> 494
<INTEREST-INCOME> 933
<OTHER-INCOME> 0
<EXPENSES-NET> (1,996)
<NET-INVESTMENT-INCOME> (569)
<REALIZED-GAINS-CURRENT> 132,251
<APPREC-INCREASE-CURRENT> 94,078
<NET-CHANGE-FROM-OPS> 225,760
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2)
<DISTRIBUTIONS-OF-GAINS> (77,567)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 9,395
<NUMBER-OF-SHARES-REDEEMED> (9,703)
<SHARES-REINVESTED> 3,801
<NET-CHANGE-IN-ASSETS> 279,847
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 39,335
<OVERDISTRIB-NII-PRIOR> (329)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,568
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,075
<AVERAGE-NET-ASSETS> 627,408
<PER-SHARE-NAV-BEGIN> 18.62
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 7.60
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (3.49)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 22.72
<EXPENSE-RATIO> 0.62
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 122
<NAME> MID-CAP GROWTH PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 750,269
<INVESTMENTS-AT-VALUE> 868,887
<RECEIVABLES> 11,034
<ASSETS-OTHER> 26
<OTHER-ITEMS-ASSETS> 3
<TOTAL-ASSETS> 879,950
<PAYABLE-FOR-SECURITIES> 465
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 118,625
<TOTAL-LIABILITIES> 119,090
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 514,481
<SHARES-COMMON-STOCK> 6,948
<SHARES-COMMON-PRIOR> 1,309
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (571)
<ACCUMULATED-NET-GAINS> 128,332
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 118,618
<NET-ASSETS> 760,860
<DIVIDEND-INCOME> 494
<INTEREST-INCOME> 933
<OTHER-INCOME> 0
<EXPENSES-NET> (1,996)
<NET-INVESTMENT-INCOME> (569)
<REALIZED-GAINS-CURRENT> 132,251
<APPREC-INCREASE-CURRENT> 94,078
<NET-CHANGE-FROM-OPS> 225,760
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2)
<DISTRIBUTIONS-OF-GAINS> (77,567)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,486
<NUMBER-OF-SHARES-REDEEMED> (806)
<SHARES-REINVESTED> 18
<NET-CHANGE-IN-ASSETS> 279,847
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 39,335
<OVERDISTRIB-NII-PRIOR> (329)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,568
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,075
<AVERAGE-NET-ASSETS> 627,408
<PER-SHARE-NAV-BEGIN> 18.55
<PER-SHARE-NII> (0.03)
<PER-SHARE-GAIN-APPREC> 7.55
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (3.49)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 22.58
<EXPENSE-RATIO> 0.87
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 311
<NAME> MID CAP VALUE PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 542,300
<INVESTMENTS-AT-VALUE> 554,438
<RECEIVABLES> 19,961
<ASSETS-OTHER> 9
<OTHER-ITEMS-ASSETS> 12
<TOTAL-ASSETS> 574,420
<PAYABLE-FOR-SECURITIES> 22,027
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,371
<TOTAL-LIABILITIES> 24,398
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 510,078
<SHARES-COMMON-STOCK> 26,091
<SHARES-COMMON-PRIOR> 23,216
<ACCUMULATED-NII-CURRENT> 1,198
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 26,608
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 12,138
<NET-ASSETS> 550,022
<DIVIDEND-INCOME> 2,701
<INTEREST-INCOME> 980
<OTHER-INCOME> 0
<EXPENSES-NET> (2,251)
<NET-INVESTMENT-INCOME> 1,430
<REALIZED-GAINS-CURRENT> 35,845
<APPREC-INCREASE-CURRENT> 44,676
<NET-CHANGE-FROM-OPS> 81,951
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,451)
<DISTRIBUTIONS-OF-GAINS> (31,726)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,909
<NUMBER-OF-SHARES-REDEEMED> (5,696)
<SHARES-REINVESTED> 1,662
<NET-CHANGE-IN-ASSETS> 105,687
<ACCUMULATED-NII-PRIOR> 1,259
<ACCUMULATED-GAINS-PRIOR> 24,221
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,946
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,272
<AVERAGE-NET-ASSETS> 519,707
<PER-SHARE-NAV-BEGIN> 18.12
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 3.13
<PER-SHARE-DIVIDEND> (0.06)
<PER-SHARE-DISTRIBUTIONS> (1.31)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.93
<EXPENSE-RATIO> 0.87
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 312
<NAME> MID CAP VALUE PORTFOLIO, INVESTMENT CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 542,300
<INVESTMENTS-AT-VALUE> 554,438
<RECEIVABLES> 19,961
<ASSETS-OTHER> 9
<OTHER-ITEMS-ASSETS> 12
<TOTAL-ASSETS> 574,420
<PAYABLE-FOR-SECURITIES> 22,027
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,371
<TOTAL-LIABILITIES> 24,398
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 510,078
<SHARES-COMMON-STOCK> 1,150
<SHARES-COMMON-PRIOR> 1,045
<ACCUMULATED-NII-CURRENT> 1,198
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 26,608
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 12,138
<NET-ASSETS> 550,022
<DIVIDEND-INCOME> 2,701
<INTEREST-INCOME> 980
<OTHER-INCOME> 0
<EXPENSES-NET> (2,251)
<NET-INVESTMENT-INCOME> 1,430
<REALIZED-GAINS-CURRENT> 35,845
<APPREC-INCREASE-CURRENT> 44,676
<NET-CHANGE-FROM-OPS> 81,951
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (32)
<DISTRIBUTIONS-OF-GAINS> (1,377)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 93
<NUMBER-OF-SHARES-REDEEMED> (53)
<SHARES-REINVESTED> 66
<NET-CHANGE-IN-ASSETS> 105,687
<ACCUMULATED-NII-PRIOR> 1,259
<ACCUMULATED-GAINS-PRIOR> 24,221
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,946
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,272
<AVERAGE-NET-ASSETS> 519,707
<PER-SHARE-NAV-BEGIN> 18.05
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 3.12
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> (1.31)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.87
<EXPENSE-RATIO> 1.02
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 313
<NAME> MID CAP VALUE PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 542,300
<INVESTMENTS-AT-VALUE> 554,438
<RECEIVABLES> 19,961
<ASSETS-OTHER> 9
<OTHER-ITEMS-ASSETS> 12
<TOTAL-ASSETS> 574,420
<PAYABLE-FOR-SECURITIES> 22,027
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,371
<TOTAL-LIABILITIES> 24,398
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 510,078
<SHARES-COMMON-STOCK> 358
<SHARES-COMMON-PRIOR> 271
<ACCUMULATED-NII-CURRENT> 1,198
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 26,608
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 12,138
<NET-ASSETS> 550,022
<DIVIDEND-INCOME> 2,701
<INTEREST-INCOME> 980
<OTHER-INCOME> 0
<EXPENSES-NET> (2,251)
<NET-INVESTMENT-INCOME> 1,430
<REALIZED-GAINS-CURRENT> 35,845
<APPREC-INCREASE-CURRENT> 44,676
<NET-CHANGE-FROM-OPS> 81,951
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8)
<DISTRIBUTIONS-OF-GAINS> (355)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 184
<NUMBER-OF-SHARES-REDEEMED> (117)
<SHARES-REINVESTED> 19
<NET-CHANGE-IN-ASSETS> 105,687
<ACCUMULATED-NII-PRIOR> 1,259
<ACCUMULATED-GAINS-PRIOR> 24,221
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,946
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,272
<AVERAGE-NET-ASSETS> 519,707
<PER-SHARE-NAV-BEGIN> 18.12
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 3.13
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> (1.31)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.94
<EXPENSE-RATIO> 1.14
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 16
<NAME> MORTGAGE-BACKED SECURITIES PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 33,626
<INVESTMENTS-AT-VALUE> 33,661
<RECEIVABLES> 5,197
<ASSETS-OTHER> 3
<OTHER-ITEMS-ASSETS> 29
<TOTAL-ASSETS> 38,890
<PAYABLE-FOR-SECURITIES> 17,816
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 64
<TOTAL-LIABILITIES> 17,880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 23,363
<SHARES-COMMON-STOCK> 2,025
<SHARES-COMMON-PRIOR> 2,714
<ACCUMULATED-NII-CURRENT> 407
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,790)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (30)
<NET-ASSETS> 21,010
<DIVIDEND-INCOME> 17
<INTEREST-INCOME> 990
<OTHER-INCOME> 0
<EXPENSES-NET> (62)
<NET-INVESTMENT-INCOME> 945
<REALIZED-GAINS-CURRENT> (995)
<APPREC-INCREASE-CURRENT> 656
<NET-CHANGE-FROM-OPS> 606
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,273)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 204
<NUMBER-OF-SHARES-REDEEMED> (1,003)
<SHARES-REINVESTED> 110
<NET-CHANGE-IN-ASSETS> (7,662)
<ACCUMULATED-NII-PRIOR> 731
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (1,795)
<GROSS-ADVISORY-FEES> 46
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 63
<AVERAGE-NET-ASSETS> 25,054
<PER-SHARE-NAV-BEGIN> 10.56
<PER-SHARE-NII> 0.38
<PER-SHARE-GAIN-APPREC> (0.12)
<PER-SHARE-DIVIDEND> (0.45)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.37
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER>32
<NAME> MULTI-MARKET FIXED INCOME
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> OTHER
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-31-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 128,759
<INVESTMENTS-AT-VALUE> 127,498
<RECEIVABLES> 8,477
<ASSETS-OTHER> 1
<OTHER-ITEMS-ASSETS> 126
<TOTAL-ASSETS> 136,102
<PAYABLE-FOR-SECURITIES> 38,480
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 138
<TOTAL-LIABILITIES> 38,618
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 98,634
<SHARES-COMMON-STOCK> 9,925
<SHARES-COMMON-PRIOR> 9,842
<ACCUMULATED-NII-CURRENT> 1,578
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,575)
<OVERDISTRIBUTION-GAINS> )
<ACCUM-APPREC-OR-DEPREC> (1,153)
<NET-ASSETS> 97,484
<DIVIDEND-INCOME> 16
<INTEREST-INCOME> 3,903
<OTHER-INCOME> 0
<EXPENSES-NET> (277)
<NET-INVESTMENT-INCOME> 3,642
<REALIZED-GAINS-CURRENT> (428)
<APPREC-INCREASE-CURRENT> 160
<NET-CHANGE-FROM-OPS> 3,374
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,745)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 19
<NUMBER-OF-SHARES-REDEEMED> (78)
<SHARES-REINVESTED> 142
<NET-CHANGE-IN-ASSETS> 97,484
<ACCUMULATED-NII-PRIOR> 1,681
<ACCUMULATED-GAINS-PRIOR> (1,147)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 217
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 278
<AVERAGE-NET-ASSETS> 96,934
<PER-SHARE-NAV-BEGIN> 9.86
<PER-SHARE-NII> 0.37
<PER-SHARE-GAIN-APPREC> (0.03)
<PER-SHARE-DIVIDEND> (0.38)
<PER-SHARE-DISTRIBUTIONS> (0.00)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.82
<EXPENSE-RATIO> 0.58
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 21
<NAME> MUNICIPAL PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 144,231
<INVESTMENTS-AT-VALUE> 148,287
<RECEIVABLES> 11,530
<ASSETS-OTHER> 18
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 159,835
<PAYABLE-FOR-SECURITIES> 45,187
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 103
<TOTAL-LIABILITIES> 45,290
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 109,816
<SHARES-COMMON-STOCK> 9,543
<SHARES-COMMON-PRIOR> 6,882
<ACCUMULATED-NII-CURRENT> 126
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (305)
<ACCUM-APPREC-OR-DEPREC> 4,908
<NET-ASSETS> 114,545
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,550
<OTHER-INCOME> 0
<EXPENSES-NET> (250)
<NET-INVESTMENT-INCOME> 2,300
<REALIZED-GAINS-CURRENT> 173
<APPREC-INCREASE-CURRENT> 2,128
<NET-CHANGE-FROM-OPS> 4,601
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2,491)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,874
<NUMBER-OF-SHARES-REDEEMED> (1,346)
<SHARES-REINVESTED> 133
<NET-CHANGE-IN-ASSETS> 32,263
<ACCUMULATED-NII-PRIOR> 317
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (478)
<GROSS-ADVISORY-FEES> 187
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 254
<AVERAGE-NET-ASSETS> 100,194
<PER-SHARE-NAV-BEGIN> 11.96
<PER-SHARE-NII> 0.24
<PER-SHARE-GAIN-APPREC> .07
<PER-SHARE-DIVIDEND> (.27)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.00
<EXPENSE-RATIO> 0.51
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 33
<NAME> SMALL CAP GROWTH PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 23,190
<INVESTMENTS-AT-VALUE> 25,449
<RECEIVABLES> 1,119
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 483
<TOTAL-ASSETS> 27,051
<PAYABLE-FOR-SECURITIES> 1,277
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 88
<TOTAL-LIABILITIES> 1,365
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 19,298
<SHARES-COMMON-STOCK> 1,263
<SHARES-COMMON-PRIOR> 351
<ACCUMULATED-NII-CURRENT> (26)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 4,155
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,259
<NET-ASSETS> 25,686
<DIVIDEND-INCOME> 1
<INTEREST-INCOME> 14
<OTHER-INCOME> 0
<EXPENSES-NET> (41)
<NET-INVESTMENT-INCOME> (26)
<REALIZED-GAINS-CURRENT> 4,331
<APPREC-INCREASE-CURRENT> 2,578
<NET-CHANGE-FROM-OPS> 6,883
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 979
<NUMBER-OF-SHARES-REDEEMED> (66)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 22,682
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (176)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 35
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 44
<AVERAGE-NET-ASSETS> 7,175
<PER-SHARE-NAV-BEGIN> 8.57
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 11.78
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 20.33
<EXPENSE-RATIO> 1.23
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 041
<NAME> SMALL CAP VALUE PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 806,157
<INVESTMENTS-AT-VALUE> 815,721
<RECEIVABLES> 19,376
<ASSETS-OTHER> 38
<OTHER-ITEMS-ASSETS> 1,450
<TOTAL-ASSETS> 836,585
<PAYABLE-FOR-SECURITIES> 20,701
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,335
<TOTAL-LIABILITIES> 23,036
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 809,062
<SHARES-COMMON-STOCK> 48,671
<SHARES-COMMON-PRIOR> 41,255
<ACCUMULATED-NII-CURRENT> 2,646
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (7,723)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,564
<NET-ASSETS> 813,549
<DIVIDEND-INCOME> 4,175
<INTEREST-INCOME> 1,738
<OTHER-INCOME> 0
<EXPENSES-NET> (3,350)
<NET-INVESTMENT-INCOME> 2,563
<REALIZED-GAINS-CURRENT> (2,163)
<APPREC-INCREASE-CURRENT> 78,163
<NET-CHANGE-FROM-OPS> 78,563
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2,892)
<DISTRIBUTIONS-OF-GAINS> (101,623)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,734
<NUMBER-OF-SHARES-REDEEMED> (5,663)
<SHARES-REINVESTED> 6,346
<NET-CHANGE-IN-ASSETS> 96,820
<ACCUMULATED-NII-PRIOR> 2,975
<ACCUMULATED-GAINS-PRIOR> 96,063
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,926
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,368
<AVERAGE-NET-ASSETS> 780,429
<PER-SHARE-NAV-BEGIN> 17.37
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 1.82
<PER-SHARE-DIVIDEND> (0.07)
<PER-SHARE-DISTRIBUTIONS> (2.46)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.71
<EXPENSE-RATIO> 0.87
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 042
<NAME> SMALL CAP VALUE PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 06-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 806,157
<INVESTMENTS-AT-VALUE> 815,721
<RECEIVABLES> 19,376
<ASSETS-OTHER> 38
<OTHER-ITEMS-ASSETS> 1,450
<TOTAL-ASSETS> 836,585
<PAYABLE-FOR-SECURITIES> 20,701
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,335
<TOTAL-LIABILITIES> 23,036
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 809,062
<SHARES-COMMON-STOCK> 23
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 2,646
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (7,723)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 9,564
<NET-ASSETS> 813,549
<DIVIDEND-INCOME> 4,175
<INTEREST-INCOME> 1,738
<OTHER-INCOME> 0
<EXPENSES-NET> (3,350)
<NET-INVESTMENT-INCOME> 2,563
<REALIZED-GAINS-CURRENT> (2,163)
<APPREC-INCREASE-CURRENT> 78,163
<NET-CHANGE-FROM-OPS> 78,563
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 23
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 96,820
<ACCUMULATED-NII-PRIOR> 2,975
<ACCUMULATED-GAINS-PRIOR> 96,063
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,926
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 3,368
<AVERAGE-NET-ASSETS> 780,429
<PER-SHARE-NAV-BEGIN> 17.32
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> (0.61)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.71
<EXPENSE-RATIO> 1.12
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 181
<NAME> SPECIAL PURPOSE FIXED INCOME PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> OCT-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 664,937
<INVESTMENTS-AT-VALUE> 659,788
<RECEIVABLES> 24,760
<ASSETS-OTHER> 27
<OTHER-ITEMS-ASSETS> 440
<TOTAL-ASSETS> 685,015
<PAYABLE-FOR-SECURITIES> 166,150
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 28,640
<TOTAL-LIABILITIES> 194,790
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 493,238
<SHARES-COMMON-STOCK> 41,638
<SHARES-COMMON-PRIOR> 44,798
<ACCUMULATED-NII-CURRENT> 8,017
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (5,703)
<ACCUM-APPREC-OR-DEPREC> (5,327)
<NET-ASSETS> 490,225
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 16,996
<OTHER-INCOME> 0
<EXPENSES-NET> (1,218)
<NET-INVESTMENT-INCOME> 15,778
<REALIZED-GAINS-CURRENT> (4,244)
<APPREC-INCREASE-CURRENT> (3,392)
<NET-CHANGE-FROM-OPS> 8,142
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (16,609)
<DISTRIBUTIONS-OF-GAINS> (14,872)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,736
<NUMBER-OF-SHARES-REDEEMED> (8,336)
<SHARES-REINVESTED> 2,439
<NET-CHANGE-IN-ASSETS> (62,044)
<ACCUMULATED-NII-PRIOR> 8,848
<ACCUMULATED-GAINS-PRIOR> 13,413
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 954
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,232
<AVERAGE-NET-ASSETS> 509,764
<PER-SHARE-NAV-BEGIN> 12.33
<PER-SHARE-NII> 0.39
<PER-SHARE-GAIN-APPREC> (0.19)
<PER-SHARE-DIVIDEND> (0.39)
<PER-SHARE-DISTRIBUTIONS> (0.37)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.77
<EXPENSE-RATIO> 0.48
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 031
<NAME> VALUE PORTFOLIO, INSTITUTIONAL CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 1,859,933
<INVESTMENTS-AT-VALUE> 1,852,624
<RECEIVABLES> 60,433
<ASSETS-OTHER> 143
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,913,200
<PAYABLE-FOR-SECURITIES> 3,464
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 158,697
<TOTAL-LIABILITIES> 162,161
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,691,896
<SHARES-COMMON-STOCK> 102,642
<SHARES-COMMON-PRIOR> 150,952
<ACCUMULATED-NII-CURRENT> 17,426
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 48,032
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (6,315)
<NET-ASSETS> 1,751,039
<DIVIDEND-INCOME> 23,898
<INTEREST-INCOME> 1,450
<OTHER-INCOME> 0
<EXPENSES-NET> (7,798)
<NET-INVESTMENT-INCOME> 17,550
<REALIZED-GAINS-CURRENT> 53,842
<APPREC-INCREASE-CURRENT> 223,161
<NET-CHANGE-FROM-OPS> 294,553
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11,942)
<DISTRIBUTIONS-OF-GAINS> (346,188)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 14,109
<NUMBER-OF-SHARES-REDEEMED> (84,566)
<SHARES-REINVESTED> 22,148
<NET-CHANGE-IN-ASSETS> (886,996)
<ACCUMULATED-NII-PRIOR> 13,250
<ACCUMULATED-GAINS-PRIOR> 396,104
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,036
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7,920
<AVERAGE-NET-ASSETS> 2,417,006
<PER-SHARE-NAV-BEGIN> 15.16
<PER-SHARE-NII> 0.16
<PER-SHARE-GAIN-APPREC> 1.58
<PER-SHARE-DIVIDEND> (0.08)
<PER-SHARE-DISTRIBUTIONS> (2.61)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.21
<EXPENSE-RATIO> 0.62
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 032
<NAME> VALUE PORTFOLIO, INVESTMENT CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 1,859,933
<INVESTMENTS-AT-VALUE> 1,852,624
<RECEIVABLES> 60,433
<ASSETS-OTHER> 143
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,913,200
<PAYABLE-FOR-SECURITIES> 3,464
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 158,697
<TOTAL-LIABILITIES> 162,161
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,691,896
<SHARES-COMMON-STOCK> 931
<SHARES-COMMON-PRIOR> 1,619
<ACCUMULATED-NII-CURRENT> 17,426
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 48,032
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (6,315)
<NET-ASSETS> 1,751,039
<DIVIDEND-INCOME> 23,898
<INTEREST-INCOME> 1,450
<OTHER-INCOME> 0
<EXPENSES-NET> (7,798)
<NET-INVESTMENT-INCOME> 17,550
<REALIZED-GAINS-CURRENT> 53,842
<APPREC-INCREASE-CURRENT> 223,161
<NET-CHANGE-FROM-OPS> 294,553
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11,942)
<DISTRIBUTIONS-OF-GAINS> (346,188)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 110
<NUMBER-OF-SHARES-REDEEMED> (989)
<SHARES-REINVESTED> 191
<NET-CHANGE-IN-ASSETS> (886,996)
<ACCUMULATED-NII-PRIOR> 13,250
<ACCUMULATED-GAINS-PRIOR> 396,104
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6,036
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7,920
<AVERAGE-NET-ASSETS> 2,417,006
<PER-SHARE-NAV-BEGIN> 15.15
<PER-SHARE-NII> 0.14
<PER-SHARE-GAIN-APPREC> 1.59
<PER-SHARE-DIVIDEND> (0.08)
<PER-SHARE-DISTRIBUTIONS> (2.61)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.19
<EXPENSE-RATIO> 0.77
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 033
<NAME> VALUE PORTFOLIO, ADVISER CLASS
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 1,859,933
<INVESTMENTS-AT-VALUE> 1,852,624
<RECEIVABLES> 60,433
<ASSETS-OTHER> 143
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,913,200
<PAYABLE-FOR-SECURITIES> 3,464
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 158,697
<TOTAL-LIABILITIES> 162,161
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[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000741375
<NAME> MAS FUNDS
<SERIES>
<NUMBER> 30
<NAME> ADVISORY MORTGAGE PORTFOLIO
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<S> <C>
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<DISTRIBUTIONS-OF-GAINS> (140,602)
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<NUMBER-OF-SHARES-SOLD> 127,972
<NUMBER-OF-SHARES-REDEEMED> (31,903)
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<AVERAGE-NET-ASSETS> 6,987,058
<PER-SHARE-NAV-BEGIN> 10.86
<PER-SHARE-NII> 0.34
<PER-SHARE-GAIN-APPREC> (0.29)
<PER-SHARE-DIVIDEND> (0.30)
<PER-SHARE-DISTRIBUTIONS> (0.22)
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<PER-SHARE-NAV-END> 10.39
<EXPENSE-RATIO> 0.09
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
