<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from mason street
funds, inc. growth stock fund, 03/31/00 financial statements class a.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 031
<NAME> GROWTH STOCK 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> 46144286
<INVESTMENTS-AT-VALUE> 71981095
<RECEIVABLES> 254999
<ASSETS-OTHER> 8255
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 72244349
<PAYABLE-FOR-SECURITIES> 276352
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 75026
<TOTAL-LIABILITIES> 351378
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44338327
<SHARES-COMMON-STOCK> 3449669
<SHARES-COMMON-PRIOR> 3093172
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1250335
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 26304309
<NET-ASSETS> 71892971
<DIVIDEND-INCOME> 476283
<INTEREST-INCOME> 471892
<OTHER-INCOME> 0
<EXPENSES-NET> 807714
<NET-INVESTMENT-INCOME> 140461
<REALIZED-GAINS-CURRENT> 3736467
<APPREC-INCREASE-CURRENT> 11459898
<NET-CHANGE-FROM-OPS> 15336826
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 186205
<DISTRIBUTIONS-OF-GAINS> 3555397
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 221522
<NUMBER-OF-SHARES-REDEEMED> 76337
<SHARES-REINVESTED> 211312
<NET-CHANGE-IN-ASSETS> 19331666
<ACCUMULATED-NII-PRIOR> 3661
<ACCUMULATED-GAINS-PRIOR> 1415918
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 450344
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 932394
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 15.86
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 4.27
<PER-SHARE-DIVIDEND> 0.06
<PER-SHARE-DISTRIBUTIONS> 1.11
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.01
<EXPENSE-RATIO> 1.50
</TABLE>
