<ARTICLE> BD
<LEGEND>
THE SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED STATEMENT OF
FINANCIAL CONDITION AND THE CONSOLIDATED STATEMENT OF OPERATIONS AS OF JUNE 25,
1999 AND FOR THE SIX MONTHS THEN ENDED AND THE NOTES THERETO AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS FILED IN THE 1998
INVESTMENT TECHNOLOGY GROUP, INC. ANNUAL 10-K FILING.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-25-1999
<CASH>                                          80,955
<RECEIVABLES>                                   17,812
<SECURITIES-RESALE>                                  0
<SECURITIES-BORROWED>                                0
<INSTRUMENTS-OWNED>                             33,823
<PP&E>                                          19,060
<TOTAL-ASSETS>                                 180,062
<SHORT-TERM>                                         0
<PAYABLES>                                      52,024
<REPOS-SOLD>                                         0
<SECURITIES-LOANED>                                  0
<INSTRUMENTS-SOLD>                                  23
<LONG-TERM>                                          0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           315
<OTHER-SE>                                     127,700
<TOTAL-LIABILITY-AND-EQUITY>                   180,062
<TRADING-REVENUE>                                    0
<INTEREST-DIVIDENDS>                             2,061
<COMMISSIONS>                                  107,817
<INVESTMENT-BANKING-REVENUES>                        0
<FEE-REVENUE>                                        0
<INTEREST-EXPENSE>                                  19
<COMPENSATION>                                  25,915
<INCOME-PRETAX>                                 33,539
<INCOME-PRE-EXTRAORDINARY>                      33,539
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    16,753
<EPS-BASIC>                                       0.55
<EPS-DILUTED>                                     0.53