<SEC-HEADER>0000912057-99-010554.hdr.sgml : 19991224 <ACCESSION-NUMBER>0000912057-99-010554 <TYPE>8-K <PUBLIC-DOCUMENT-COUNT>2 <PERIOD>19991216 <ITEMS>5 <ITEMS>7 <FILING-DATE>19991223 <FILER> <COMPANY-DATA> <CONFORMED-NAME>ARIBA INC <CIK>0001084755 <ASSIGNED-SIC>7372 <IRS-NUMBER>770439730 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>0930 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>8-K <ACT>34 <FILE-NUMBER>000-26299 <FILM-NUMBER>99780351 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>1565 CHARLESTON RD <CITY>MOUNTAIN VIEW <STATE>CA <ZIP>94043 <PHONE>6509306200 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>1565 CHARLESTON RD <CITY>MOUNTAIN VIEW <STATE>CA <ZIP>94043 </MAIL-ADDRESS> </FILER> </SEC-HEADER>