<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 051
<NAME> AXA ROSENBERG DOUBLE ALPHA MARKET FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> SEP-30-2000
<INVESTMENTS-AT-COST> 7084039
<INVESTMENTS-AT-VALUE> 7089365
<RECEIVABLES> 5626
<ASSETS-OTHER> 402579
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 7497570
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 152577
<TOTAL-LIABILITIES> 152577
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 8808039
<SHARES-COMMON-STOCK> 911109<F1>
<SHARES-COMMON-PRIOR> 894892<F1>
<ACCUMULATED-NII-CURRENT> 9236
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 1054033
<ACCUM-APPREC-OR-DEPREC> (418249)
<NET-ASSETS> 7344993
<DIVIDEND-INCOME> 15742
<INTEREST-INCOME> 4897
<OTHER-INCOME> 0
<EXPENSES-NET> 13008
<NET-INVESTMENT-INCOME> 7631
<REALIZED-GAINS-CURRENT> (25333)
<APPREC-INCREASE-CURRENT> (337574)
<NET-CHANGE-FROM-OPS> (355276)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0<F1>
<NUMBER-OF-SHARES-SOLD> 32702
<NUMBER-OF-SHARES-REDEEMED> 20731
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (258430)
<ACCUMULATED-NII-PRIOR> 1605
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 1028700
<GROSS-ADVISORY-FEES> 3699
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 61743
<AVERAGE-NET-ASSETS> 7330919<F1>
<PER-SHARE-NAV-BEGIN> 8.41<F1>
<PER-SHARE-NII> 0.01<F1>
<PER-SHARE-GAIN-APPREC> (0.40)<F1>
<PER-SHARE-DIVIDEND> 0.00<F1>
<PER-SHARE-DISTRIBUTIONS> 0.00<F1>
<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 8.02<F1>
<EXPENSE-RATIO> 0.35<F1>
<FN>
<F1> Institutional Shares
</FN>
</TABLE>
