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SIGNATURE JAMES RIEPE
TITLE VICE PRESIDENT
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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<PER-SHARE-NAV-END> 13.55
<EXPENSE-RATIO> 0.4
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000858581
<NAME> T. ROWE PRICE EQUITY INDEX 500 FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 3051197
<INVESTMENTS-AT-VALUE> 4537560
<RECEIVABLES> 90986
<ASSETS-OTHER> 109
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 4628655
<PAYABLE-FOR-SECURITIES> 9212
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 88011
<TOTAL-LIABILITIES> 97223
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3011658
<SHARES-COMMON-STOCK> 121986
<SHARES-COMMON-PRIOR> 100277
<ACCUMULATED-NII-CURRENT> 1080
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 29628
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1489066
<NET-ASSETS> 4531432
<DIVIDEND-INCOME> 26580
<INTEREST-INCOME> 1813
<OTHER-INCOME> 0
<EXPENSES-NET> 7934
<NET-INVESTMENT-INCOME> 20459
<REALIZED-GAINS-CURRENT> 31353
<APPREC-INCREASE-CURRENT> 407965
<NET-CHANGE-FROM-OPS> 459777
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (19017)
<DISTRIBUTIONS-OF-GAINS> (13801)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 40032
<NUMBER-OF-SHARES-REDEEMED> (19224)
<SHARES-REINVESTED> 901
<NET-CHANGE-IN-ASSETS> 1183939
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 12076
<OVERDISTRIB-NII-PRIOR> 362
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3420
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7939
<AVERAGE-NET-ASSETS> 4003779
<PER-SHARE-NAV-BEGIN> 33.38
<PER-SHARE-NII> 0.17
<PER-SHARE-GAIN-APPREC> 3.88
<PER-SHARE-DIVIDEND> (0.16)
<PER-SHARE-DISTRIBUTIONS> (0.12)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 37.15
<EXPENSE-RATIO> 0.4
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
