BONUS PLAN FOR EXECUTIVE OFFICERS, ADPOTED ON NOV. 3, 2006

EXHIBIT 10.38

ARIBA BONUS PLAN

EXECUTIVE OFFICERS

1. Effective Date and Term. This Plan was adopted by the Compensation Committee (the “Committee”) of the Board of Directors of Ariba, Inc. (the “Company”) on November 3, 2006. It is effective for fiscal year 2007 and thereafter will continue to apply until it is amended or terminated by the Committee. The Plan supersedes all prior bonus plans applicable to individuals who are deemed to be “officers” of the Company for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the “Executive Officers”). Any other bonus plan applicable to Executive Officers previously approved by the Committee is hereby terminated.

2. Administration. The Committee administers the Plan and adopts rules and regulations to implement the Plan. The decisions of the Committee are final and binding on all parties who have an interest in the Plan.

3. Eligibility. Participation in the Plan is limited to Executive Officers. Participation in the Plan is effective on the day the participant starts in a bonus-eligible job. Participants must be employed in a bonus-eligible position before the first day of the last month of the fiscal half-year to be eligible to participate in the Plan for that fiscal half-year. Bonus payments will be prorated for participants who become eligible after the start of a fiscal half-year or for participants who are on a leave of absence or sabbatical for all or part of a fiscal half-year. A participant may be removed from the Plan at any time and for any reason, at the Company’s discretion, regardless of whether he or sh