<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ARIBA INC.'S
QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 2000 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          SEP-30-2000
<PERIOD-START>                             OCT-01-1999
<PERIOD-END>                               JUN-30-2000
<CASH>                                         183,747
<SECURITIES>                                   154,408
<RECEIVABLES>                                   48,634
<ALLOWANCES>                                   (4,665)
<INVENTORY>                                          0
<CURRENT-ASSETS>                               302,377
<PP&E>                                          38,343
<DEPRECIATION>                                 (6,250)
<TOTAL-ASSETS>                               3,570,970
<CURRENT-LIABILITIES>                          232,247
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           476
<OTHER-SE>                                   3,337,714
<TOTAL-LIABILITY-AND-EQUITY>                 3,570,970
<SALES>                                         95,545
<TOTAL-REVENUES>                               144,186
<CGS>                                            5,358
<TOTAL-COSTS>                                   23,882
<OTHER-EXPENSES>                               582,879
<LOSS-PROVISION>                                 1,527
<INTEREST-EXPENSE>                                 161
<INCOME-PRETAX>                              (452,558)
<INCOME-TAX>                                       875
<INCOME-CONTINUING>                          (453,433)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 (453,433)
<EPS-BASIC>                                     (2.46)
<EPS-DILUTED>                                   (2.46)