<TABLE> <S> <C>

<PAGE>
<ARTICLE> 7
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET OF ARCH CAPITAL GROUP LTD AND ITS SUBSIDIARY AT
MARCH 31, 2000 AND THE RELATED STATEMENT OF INCOME, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<DEBT-HELD-FOR-SALE>                            97,798
<DEBT-CARRYING-VALUE>                                0
<DEBT-MARKET-VALUE>                                  0
<EQUITIES>                                     105,274
<MORTGAGE>                                           0
<REAL-ESTATE>                                        0
<TOTAL-INVEST>                                 241,878
<CASH>                                          17,374
<RECOVER-REINSURE>                                   0
<DEFERRED-ACQUISITION>                               0
<TOTAL-ASSETS>                                 268,583
<POLICY-LOSSES>                                      0
<UNEARNED-PREMIUMS>                                  0
<POLICY-OTHER>                                       0
<POLICY-HOLDER-FUNDS>                                0
<NOTES-PAYABLE>                                      0
                                0
                                          0
<COMMON>                                           172
<OTHER-SE>                                     254,733
<TOTAL-LIABILITY-AND-EQUITY>                   268,583
                                      87,530
<INVESTMENT-INCOME>                              9,547
<INVESTMENT-GAINS>                              28,933
<OTHER-INCOME>                                   2,191
<BENEFITS>                                      76,263
<UNDERWRITING-AMORTIZATION>                     26,756
<UNDERWRITING-OTHER>                             5,405
<INCOME-PRETAX>                                 19,777
<INCOME-TAX>                                    17,160
<INCOME-CONTINUING>                              3,256<F1>
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,256<F1>
<EPS-BASIC>                                       0.23<F1>
<EPS-DILUTED>                                     0.23<F1>
<RESERVE-OPEN>                                 308,628
<PROVISION-CURRENT>                             76,262
<PROVISION-PRIOR>                                    0
<PAYMENTS-CURRENT>                              76,263
<PAYMENTS-PRIOR>                               308,628
<RESERVE-CLOSE>                                      0<F2>
<CUMULATIVE-DEFICIENCY>                              0
<FN>
<F1>INCLUDES EQUITY IN NET INCOME OF INVESTEES OF $639. NET INCOME EXCLUDES
OTHER COMPREHENSIVE INCOME (LOSS). COMPREHENSIVE (LOSS) WAS ($32,790) OR
($2.35) PER SHARE BASIC AND DILUTED.
<F2>LOSS RESERVES NET OF REINSURANCE.
</FN>


</TABLE>



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