<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
this schedule contains summary financial information extracted from mason street
funds, inc. small cap. growth stock fund, 09/30/00 financial statement class a.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 111
<NAME> SMALL CAP. GROWTH STOCK FUND CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 12,241,163
<INVESTMENTS-AT-VALUE> 15,196,027
<RECEIVABLES> 447,581
<ASSETS-OTHER> 53,021
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,696,629
<PAYABLE-FOR-SECURITIES> 88,212
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 93,201
<TOTAL-LIABILITIES> 181,413
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 10,143,744
<SHARES-COMMON-STOCK> 692,184
<SHARES-COMMON-PRIOR> 576,139
<ACCUMULATED-NII-CURRENT> (66,556)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2,483,164
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,954,864
<NET-ASSETS> 15,515,216
<DIVIDEND-INCOME> 7,585
<INTEREST-INCOME> 26,279
<OTHER-INCOME> 0
<EXPENSES-NET> (100,420)
<NET-INVESTMENT-INCOME> (66,556)
<REALIZED-GAINS-CURRENT> 488,967
<APPREC-INCREASE-CURRENT> 349,554
<NET-CHANGE-FROM-OPS> 771,965
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 142,553
<NUMBER-OF-SHARES-REDEEMED> 26,508
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 3,489,090
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1,994,197
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 58,059
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 189,453
<AVERAGE-NET-ASSETS> 11,319,419
<PER-SHARE-NAV-BEGIN> 17.59
<PER-SHARE-NII> (0.15)
<PER-SHARE-GAIN-APPREC> 1.16
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 18.60
<EXPENSE-RATIO> 1.40
</TABLE>
