<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000912028
<NAME> T. ROWE PRICE SUMMIT GNMA FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> APR-30-2000
<INVESTMENTS-AT-COST> 61009
<INVESTMENTS-AT-VALUE> 59042
<RECEIVABLES> 748
<ASSETS-OTHER> 48
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 59838
<PAYABLE-FOR-SECURITIES> 1661
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 366
<TOTAL-LIABILITIES> 2026
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 61428
<SHARES-COMMON-STOCK> 6281
<SHARES-COMMON-PRIOR> 6802
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (244)
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (1405)
<ACCUM-APPREC-OR-DEPREC> (1967)
<NET-ASSETS> 57812
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2172
<OTHER-INCOME> 0
<EXPENSES-NET> 177
<NET-INVESTMENT-INCOME> 1995
<REALIZED-GAINS-CURRENT> (901)
<APPREC-INCREASE-CURRENT> (332)
<NET-CHANGE-FROM-OPS> 762
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1995)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1128
<NUMBER-OF-SHARES-REDEEMED> (1794)
<SHARES-REINVESTED> 145
<NET-CHANGE-IN-ASSETS> (6031)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> (244)
<OVERDIST-NET-GAINS-PRIOR> (504)
<GROSS-ADVISORY-FEES> 76
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 177
<AVERAGE-NET-ASSETS> 59350
<PER-SHARE-NAV-BEGIN> 9.39
<PER-SHARE-NII> 0.31
<PER-SHARE-GAIN-APPREC> (0.19)
<PER-SHARE-DIVIDEND> (0.31)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.2
<EXPENSE-RATIO> 0.6
</TABLE>
