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<PAGE> PAGE 3
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<PAGE> PAGE 7
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 21
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015 A000501 CUSTODIAL TRUST COMPANY
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<PAGE> PAGE 22
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<PAGE> PAGE 23
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<PAGE> PAGE 24
070 G020500 N
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<PAGE> PAGE 25
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015 A000601 CUSTODIAL TRUST COMPANY
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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SIGNATURE GARY TENKMAN
TITLE VICE PRESIDENT
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<F1> Institutional Shares
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<SERIES>
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<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
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<ACCUMULATED-NII-PRIOR> 979
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 967590
<GROSS-ADVISORY-FEES> 6478
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 77742
<AVERAGE-NET-ASSETS> 94945<F1>
<PER-SHARE-NAV-BEGIN> 5.44<F1>
<PER-SHARE-NII> (0.01)<F1>
<PER-SHARE-GAIN-APPREC> 1.99<F1>
<PER-SHARE-DIVIDEND> 0.00<F1>
<PER-SHARE-DISTRIBUTIONS> 0.00<F1>
<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 7.42<F1>
<EXPENSE-RATIO> 1.75<F1>
<FN>
<F1> Select Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 031
<NAME> INTERNATIONAL SMALL CAPITALIZATION SERIES
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
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<RECEIVABLES> 332091
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<TOTAL-ASSETS> 42358489
<PAYABLE-FOR-SECURITIES> 199714
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<NET-INVESTMENT-INCOME> 431553
<REALIZED-GAINS-CURRENT> 373654
<APPREC-INCREASE-CURRENT> 5437736
<NET-CHANGE-FROM-OPS> 6242943
<EQUALIZATION> 0
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<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0<F1>
<NUMBER-OF-SHARES-SOLD> 606034
<NUMBER-OF-SHARES-REDEEMED> 625816
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 6084789
<ACCUMULATED-NII-PRIOR> 221862
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 2050739
<GROSS-ADVISORY-FEES> 199128
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<GROSS-EXPENSE> 413106
<AVERAGE-NET-ASSETS> 37955702<F1>
<PER-SHARE-NAV-BEGIN> 9.11<F1>
<PER-SHARE-NII> 0.11<F1>
<PER-SHARE-GAIN-APPREC> 1.49<F1>
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<PER-SHARE-DISTRIBUTIONS> 0.00<F1>
<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 10.71<F1>
<EXPENSE-RATIO> 1.50<F1>
<FN>
<F1> Institutional Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 032
<NAME> INTERNATIONAL SMALL CAPITALIZATION SERIES
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 38451006
<INVESTMENTS-AT-VALUE> 40949957
<RECEIVABLES> 332091
<ASSETS-OTHER> 1076441
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<TOTAL-ASSETS> 42358489
<PAYABLE-FOR-SECURITIES> 199714
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<TOTAL-LIABILITIES> 284516
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<SHARES-COMMON-STOCK> 202464<F1>
<SHARES-COMMON-PRIOR> 186624<F1>
<ACCUMULATED-NII-CURRENT> 653415
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 1677085
<ACCUM-APPREC-OR-DEPREC> 2547275
<NET-ASSETS> 42073973
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<INTEREST-INCOME> 0
<OTHER-INCOME> 0
<EXPENSES-NET> 300378
<NET-INVESTMENT-INCOME> 431553
<REALIZED-GAINS-CURRENT> 373654
<APPREC-INCREASE-CURRENT> 5437736
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<NUMBER-OF-SHARES-SOLD> 606034
<NUMBER-OF-SHARES-REDEEMED> 625816
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 6084789
<ACCUMULATED-NII-PRIOR> 221862
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 2050739
<GROSS-ADVISORY-FEES> 199128
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 413106
<AVERAGE-NET-ASSETS> 1903089<F1>
<PER-SHARE-NAV-BEGIN> 9.10<F1>
<PER-SHARE-NII> 0.09<F1>
<PER-SHARE-GAIN-APPREC> 1.48<F1>
<PER-SHARE-DIVIDEND> 0.00<F1>
<PER-SHARE-DISTRIBUTIONS> 0.00<F1>
<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 10.67<F1>
<EXPENSE-RATIO> 1.82<F1>
<FN>
<F1> Select Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 041
<NAME> MARKET NEUTRAL FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 101838726
<INVESTMENTS-AT-VALUE> 109071852
<RECEIVABLES> 6438281
<ASSETS-OTHER> 104068120
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<TOTAL-ASSETS> 219578253
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<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 105583077
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<SHARES-COMMON-PRIOR> 18056909<F1>
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<OVERDISTRIBUTION-NII> 0
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<NET-INVESTMENT-INCOME> 1577933
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<APPREC-INCREASE-CURRENT> (18568381)
<NET-CHANGE-FROM-OPS> (11484404)
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<NUMBER-OF-SHARES-REDEEMED> 14368462
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (85795995)
<ACCUMULATED-NII-PRIOR> 1560774
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 53013504
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<PER-SHARE-NAV-BEGIN> 8.99<F1>
<PER-SHARE-NII> 0.15<F1>
<PER-SHARE-GAIN-APPREC> (0.71)<F1>
<PER-SHARE-DIVIDEND> 0.00<F1>
<PER-SHARE-DISTRIBUTIONS> 0.00<F1>
<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 8.43<F1>
<EXPENSE-RATIO> 3.19<F1>
<FN>
<F1> Institutional Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 042
<NAME> MARKET NEUTRAL FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 101838726
<INVESTMENTS-AT-VALUE> 109071852
<RECEIVABLES> 6438281
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<NET-CHANGE-IN-ASSETS> (85795995)
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<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 53013504
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<GROSS-EXPENSE> 2487907
<AVERAGE-NET-ASSETS> 20532116<F1>
<PER-SHARE-NAV-BEGIN> 8.98<F1>
<PER-SHARE-NII> 0.23<F1>
<PER-SHARE-GAIN-APPREC> (0.81)<F1>
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<PER-SHARE-DISTRIBUTIONS> 0.00<F1>
<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 8.40<F1>
<EXPENSE-RATIO> 3.48<F1>
<FN>
<F1> Investor Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 051
<NAME> DOUBLE ALPHA MARKET FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 7181925
<INVESTMENTS-AT-VALUE> 7129377
<RECEIVABLES> 129605
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<OTHER-ITEMS-LIABILITIES> 14031
<TOTAL-LIABILITIES> 14031
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<OVERDISTRIBUTION-GAINS> 116362
<ACCUM-APPREC-OR-DEPREC> (426523)
<NET-ASSETS> 7706613
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<EXPENSES-NET> 13459
<NET-INVESTMENT-INCOME> (2396)
<REALIZED-GAINS-CURRENT> (226477)
<APPREC-INCREASE-CURRENT> (186401)
<NET-CHANGE-FROM-OPS> (415274)
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<PER-SHARE-NAV-BEGIN> 9.81<F1>
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<PER-SHARE-GAIN-APPREC> (0.73)<F1>
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<RETURNS-OF-CAPITAL> 0.00<F1>
<PER-SHARE-NAV-END> 9.08<F1>
<EXPENSE-RATIO> 0.35<F1>
<FN>
<F1> Institutional Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 052
<NAME> DOUBLE ALPHA MARKET FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
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<ACCUM-APPREC-OR-DEPREC> (426523)
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<PER-SHARE-NAV-BEGIN> 9.79<F1>
<PER-SHARE-NII> (0.01)<F1>
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<PER-SHARE-NAV-END> 9.05<F1>
<EXPENSE-RATIO> 0.60<F1>
<FN>
<F1> Investor Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 061
<NAME> SELECT SECTORS MARKET NEUTRAL FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAR-31-2000
<PERIOD-START> APR-01-1999
<PERIOD-END> SEP-30-1999
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<FN>
<F1> Institutional Shares
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000832545
<NAME> BARR ROSENBERG SERIES TRUST
<SERIES>
<NUMBER> 062
<NAME> SELECT SECTORS MARKET NEUTRAL FUND
<S> <C>
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<FN>
<F1> Investor Shares
</FN>
</TABLE>
