<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
this schedule contains summary financial information extracted from mason street
funds, inc. high yield bond fund, 03/31/00 financial statements class a.
</LEGEND>
<CIK> 0001023744
<NAME> MASON STREET FUNDS, INC.
<SERIES>
<NUMBER> 081
<NAME> HIGH YIELD BOND 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> 42542471
<INVESTMENTS-AT-VALUE> 39975351
<RECEIVABLES> 1635371
<ASSETS-OTHER> 8255
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 41618977
<PAYABLE-FOR-SECURITIES> 2249506
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 50548
<TOTAL-LIABILITIES> 2300054
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 49390816
<SHARES-COMMON-STOCK> 4371667
<SHARES-COMMON-PRIOR> 4268613
<ACCUMULATED-NII-CURRENT> 65113
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (7569886)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2567120)
<NET-ASSETS> 39318923
<DIVIDEND-INCOME> 690924
<INTEREST-INCOME> 4165530
<OTHER-INCOME> 0
<EXPENSES-NET> 587559
<NET-INVESTMENT-INCOME> 4268895
<REALIZED-GAINS-CURRENT> (6289754)
<APPREC-INCREASE-CURRENT> (2062972)
<NET-CHANGE-FROM-OPS> 42113
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 3788131
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 197261
<NUMBER-OF-SHARES-REDEEMED> 504480
<SHARES-REINVESTED> 410273
<NET-CHANGE-IN-ASSETS> (2779312)
<ACCUMULATED-NII-PRIOR> 63116
<ACCUMULATED-GAINS-PRIOR> (1280132)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 321268
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 718125
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 8.76
<PER-SHARE-NII> 0.80
<PER-SHARE-GAIN-APPREC> (0.83)
<PER-SHARE-DIVIDEND> 0.80
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.93
<EXPENSE-RATIO> 1.95
</TABLE>
