<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
this schedule contains summary financial information extracted from mason street
funds, inc. growth stock fund, 09/30/00 financial statements class a.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 071
<NAME> 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> 51,083,934
<INVESTMENTS-AT-VALUE> 74,084,752
<RECEIVABLES> 537,548
<ASSETS-OTHER> 6,172
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 74,628,472
<PAYABLE-FOR-SECURITIES> 288,571
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 290,730
<TOTAL-LIABILITIES> 579,301
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 46,015,441
<SHARES-COMMON-STOCK> 3,502,075
<SHARES-COMMON-PRIOR> 3,449,669
<ACCUMULATED-NII-CURRENT> 31,346
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 5,331,116
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 22,671,268
<NET-ASSETS> 74,049,171
<DIVIDEND-INCOME> 219,309
<INTEREST-INCOME> 310,414
<OTHER-INCOME> 0
<EXPENSES-NET> (498,208)
<NET-INVESTMENT-INCOME> 31,515
<REALIZED-GAINS-CURRENT> 4,080,220
<APPREC-INCREASE-CURRENT> (3,633,041)
<NET-CHANGE-FROM-OPS> 478,694
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 87,654
<NUMBER-OF-SHARES-REDEEMED> 35,248
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 2,156,200
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1,250,335
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 276,091
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 554,085
<AVERAGE-NET-ASSETS> 66,317,074
<PER-SHARE-NAV-BEGIN> 19.01
<PER-SHARE-NII> .01
<PER-SHARE-GAIN-APPREC> .11
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 19.13
<EXPENSE-RATIO> 1.30
</TABLE>
