<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S REGISTRATION STATEMENT ON FORM S-1 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH REGISTRATION STATEMENT ON FORM S-1.
</LEGEND>
<CIK> 0001079880
<NAME> ONESOURCE INFORMATION SERVICES, INC.
<MULTIPLIER> 1
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<CASH>                                           8,665
<SECURITIES>                                         0
<RECEIVABLES>                                    9,921
<ALLOWANCES>                                       300
<INVENTORY>                                          0
<CURRENT-ASSETS>                                25,374
<PP&E>                                           5,804
<DEPRECIATION>                                   4,034
<TOTAL-ASSETS>                                  27,646
<CURRENT-LIABILITIES>                           27,492
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
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<COMMON>                                         3,592
<OTHER-SE>                                     (9,903)
<TOTAL-LIABILITY-AND-EQUITY>                    27,646
<SALES>                                         30,428
<TOTAL-REVENUES>                                30,428
<CGS>                                           13,655
<TOTAL-COSTS>                                   13,655
<OTHER-EXPENSES>                                21,737
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 595
<INCOME-PRETAX>                                  7,238
<INCOME-TAX>                                       250
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<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,988
<EPS-PRIMARY>                                     0.85
<EPS-DILUTED>                                     0.59