<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ARIBA INC.'S
QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED MARCH 31, 2000 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0001084755
<NAME> ARIBA, INC.
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-2000
<PERIOD-START>                             OCT-01-1999
<PERIOD-END>                               MAR-31-2000
<CASH>                                         189,303
<SECURITIES>                                   129,796
<RECEIVABLES>                                   14,155
<ALLOWANCES>                                   (4,365)
<INVENTORY>                                          0
<CURRENT-ASSETS>                               268,243
<PP&E>                                          27,302
<DEPRECIATION>                                 (3,818)
<TOTAL-ASSETS>                               3,746,760
<CURRENT-LIABILITIES>                          161,924
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           468
<OTHER-SE>                                   3,583,704
<TOTAL-LIABILITY-AND-EQUITY>                 3,746,760
<SALES>                                         41,971
<TOTAL-REVENUES>                                63,521
<CGS>                                            2,241
<TOTAL-COSTS>                                    9,889
<OTHER-EXPENSES>                               194,236
<LOSS-PROVISION>                                 1,227
<INTEREST-EXPENSE>                                 131
<INCOME-PRETAX>                              (135,832)
<INCOME-TAX>                                       442
<INCOME-CONTINUING>                          (136,274)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 (136,274)
<EPS-BASIC>                                     (0.81)<F1>
<EPS-DILUTED>                                   (0.81)<F1>
<FN>
<F1>EPS Information has been restated to reflect a two for one stock split,
effected in the form of a stock dividend to each stockholder of record as of
March 20, 2000. Prior Financial Data Schedules have not been restated for the
Recapitalization.
</FN>