<ARTICLE> BD
<LEGEND>
THE SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED STATEMENT OF
FINANCIAL CONDITION AND THE CONSOLIDATED STATEMENT OF OPERATIONS AS OF DECEMBER
31, 1999 AND FOR THE YEAR THEN ENDED AND THE NOTES THERETO AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS FILED IN THE 1999
INVESTMENT TECHNOLOGY GROUP, INC. ANNUAL 10-K FILING.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          53,081
<RECEIVABLES>                                   19,181
<SECURITIES-RESALE>                                  0
<SECURITIES-BORROWED>                                0
<INSTRUMENTS-OWNED>                             59,557
<PP&E>                                          20,229
<TOTAL-ASSETS>                                 179,488
<SHORT-TERM>                                         0
<PAYABLES>                                      42,265
<REPOS-SOLD>                                         0
<SECURITIES-LOANED>                                  0
<INSTRUMENTS-SOLD>                               5,861
<LONG-TERM>                                          0
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<PREFERRED>                                          0
<COMMON>                                           322
<OTHER-SE>                                     115,330
<TOTAL-LIABILITY-AND-EQUITY>                   179,488
<TRADING-REVENUE>                               (4,478)
<INTEREST-DIVIDENDS>                             4,331
<COMMISSIONS>                                  227,960
<INVESTMENT-BANKING-REVENUES>                        0
<FEE-REVENUE>                                    4,231
<INTEREST-EXPENSE>                                  58
<COMPENSATION>                                  51,717
<INCOME-PRETAX>                                 82,861
<INCOME-PRE-EXTRAORDINARY>                      82,861
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    45,426
<EPS-BASIC>                                       1.48
<EPS-DILUTED>                                     1.42