<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ONESOURCE
INFORMATION SERVICES, INC.'S CONSOLIDATED BALANCE SHEET FOR SEPTEMBER 30, 2000
AND CONSOLIDATED STATEMENT OF OPERATIONS FOR THE NINE MONTHS ENDED SEPTEMBER 30,
2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<EXCHANGE-RATE>                                      1
<CASH>                                          16,729
<SECURITIES>                                         0
<RECEIVABLES>                                    9,216
<ALLOWANCES>                                       375
<INVENTORY>                                         31
<CURRENT-ASSETS>                                31,212
<PP&E>                                           9,107
<DEPRECIATION>                                   3,847
<TOTAL-ASSETS>                                  45,967
<CURRENT-LIABILITIES>                           31,625
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           117
<OTHER-SE>                                      14,225
<TOTAL-LIABILITY-AND-EQUITY>                    45,967
<SALES>                                         37,785
<TOTAL-REVENUES>                                37,785
<CGS>                                           13,294
<TOTAL-COSTS>                                   13,294
<OTHER-EXPENSES>                                26,819
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                (88)
<INCOME-PRETAX>                                  (217)
<INCOME-TAX>                                        77
<INCOME-CONTINUING>                              (294)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (294)
<EPS-BASIC>                                     (0.03)
<EPS-DILUTED>                                   (0.03)