<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
this schedule contains summary financial information extracted from mason street
funds, inc. asset allocation fund, 03/31/00 financial statements class a.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 091
<NAME> ASSET ALLOCATION FUND CLASS A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> MAR-31-2000
<INVESTMENTS-AT-COST> 54165005
<INVESTMENTS-AT-VALUE> 67021648
<RECEIVABLES> 1722379
<ASSETS-OTHER> 90928
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 68834955
<PAYABLE-FOR-SECURITIES> 1340542
<SENIOR-LONG-TERM-DEBT> 60106
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 1400648
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 50495789
<SHARES-COMMON-STOCK> 3777996
<SHARES-COMMON-PRIOR> 3223425
<ACCUMULATED-NII-CURRENT> 416361
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3554449
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 12967708
<NET-ASSETS> 67434307
<DIVIDEND-INCOME> 333390
<INTEREST-INCOME> 2003774
<OTHER-INCOME> 0
<EXPENSES-NET> 788432
<NET-INVESTMENT-INCOME> 1548732
<REALIZED-GAINS-CURRENT> 6498709
<APPREC-INCREASE-CURRENT> 7439572
<NET-CHANGE-FROM-OPS> 15487013
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1255848
<DISTRIBUTIONS-OF-GAINS> 3354503
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 313966
<NUMBER-OF-SHARES-REDEEMED> 93783
<SHARES-REINVESTED> 334388
<NET-CHANGE-IN-ASSETS> 21358789
<ACCUMULATED-NII-PRIOR> 311695
<ACCUMULATED-GAINS-PRIOR> 1030091
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 385162
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 913811
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 12.49
<PER-SHARE-NII> 0.39
<PER-SHARE-GAIN-APPREC> 3.41
<PER-SHARE-DIVIDEND> 0.37
<PER-SHARE-DISTRIBUTIONS> 0.99
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.93
<EXPENSE-RATIO> 1.35
</TABLE>
