<TABLE> <S> <C>
<PAGE>
<ARTICLE> BD
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED STATEMENT OF INCOME AND CONSOLIDATED STATEMENT OF FINANCIAL
CONDITION IN THE COMPANY'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTERLY
PERIOD ENDED JUNE 30, 2000. 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
<CASH> 383,703
<RECEIVABLES> 317,772
<SECURITIES-RESALE> 0
<SECURITIES-BORROWED> 0
<INSTRUMENTS-OWNED> 1,428,211
<PP&E> 50,201
<TOTAL-ASSETS> 2,311,578
<SHORT-TERM> 0
<PAYABLES> 251,008
<REPOS-SOLD> 0
<SECURITIES-LOANED> 0
<INSTRUMENTS-SOLD> 1,354,477
<LONG-TERM> 0
0
0
<COMMON> 1,223
<OTHER-SE> 704,870
<TOTAL-LIABILITY-AND-EQUITY> 2,311,578
<TRADING-REVENUE> 770,086
<INTEREST-DIVIDENDS> 22,495
<COMMISSIONS> 10,177
<INVESTMENT-BANKING-REVENUES> 0
<FEE-REVENUE> 20,329
<INTEREST-EXPENSE> 14,864
<COMPENSATION> 277,416
<INCOME-PRETAX> 325,855
<INCOME-PRE-EXTRAORDINARY> 325,855
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 203,751
<EPS-BASIC> 1.67
<EPS-DILUTED> 1.60
</TABLE>