<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MASON STREET
FUNDS, INC. GROWTH AND INCOME STOCK FUND, 03/31/00 FINANCIAL STATEMENTS CLASS B.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 042
<NAME> MASON STREET GROWTH AND INCOME STOCK FUND CLASS B
<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> 50049776
<INVESTMENTS-AT-VALUE> 57634458
<RECEIVABLES> 433970
<ASSETS-OTHER> 38556
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 58106984
<PAYABLE-FOR-SECURITIES> 289971
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 68424
<TOTAL-LIABILITIES> 358395
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 50026691
<SHARES-COMMON-STOCK> 509112
<SHARES-COMMON-PRIOR> 364185
<ACCUMULATED-NII-CURRENT> 73487
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 63729
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7584682
<NET-ASSETS> 57748589
<DIVIDEND-INCOME> 697539
<INTEREST-INCOME> 39243
<OTHER-INCOME> 0
<EXPENSES-NET> 665383
<NET-INVESTMENT-INCOME> 71399
<REALIZED-GAINS-CURRENT> 769017
<APPREC-INCREASE-CURRENT> 4331609
<NET-CHANGE-FROM-OPS> 5172025
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 330856
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 204927
<NUMBER-OF-SHARES-REDEEMED> 86703
<SHARES-REINVESTED> 26703
<NET-CHANGE-IN-ASSETS> 7814371
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2225465
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 343687
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 797304
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 11.85
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 1.11
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0.67
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.25
<EXPENSE-RATIO> 1.85
</TABLE>
