<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000893658
<NAME> ARK
<SERIES>
<NUMBER> 181
<NAME> ARK EQUITY INDEX RETAIL A
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> APR-30-2000
<PERIOD-START> MAY-01-1999
<PERIOD-END> APR-30-2000
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<INVESTMENTS-AT-VALUE> 172098
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<TOTAL-ASSETS> 173096
<PAYABLE-FOR-SECURITIES> 14445
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 41
<TOTAL-LIABILITIES> 14486
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 130051
<SHARES-COMMON-STOCK> 504
<SHARES-COMMON-PRIOR> 359
<ACCUMULATED-NII-CURRENT> 92
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2253
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 26214
<NET-ASSETS> 158610
<DIVIDEND-INCOME> 1424
<INTEREST-INCOME> 122
<OTHER-INCOME> 0
<EXPENSES-NET> (316)
<NET-INVESTMENT-INCOME> 1230
<REALIZED-GAINS-CURRENT> 4081
<APPREC-INCREASE-CURRENT> 6778
<NET-CHANGE-FROM-OPS> 12089
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (50)
<DISTRIBUTIONS-OF-GAINS> (143)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 216
<NUMBER-OF-SHARES-REDEEMED> (85)
<SHARES-REINVESTED> 13
<NET-CHANGE-IN-ASSETS> 2479
<ACCUMULATED-NII-PRIOR> 53
<ACCUMULATED-GAINS-PRIOR> 892
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 242
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 737
<AVERAGE-NET-ASSETS> 120933
<PER-SHARE-NAV-BEGIN> 13.84
<PER-SHARE-NII> 0.11
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<PER-SHARE-NAV-END> 14.79
<EXPENSE-RATIO> 0.50
</TABLE>
