Ariba Announces Agreement with Nissan; Leading Automaker Selects Sourcing Solutions to Drive Spend Management.

SUNNYVALE, Calif. -- Ariba(R), Inc. (Nasdaq:ARBA), the leading Spend Management (SM) solutions provider, today announced that it has signed an agreement with Nissan Motor Co., Ltd. (TSE: NSANF), a leading global provider of innovative automotive products and services. Under the terms of the agreement, Nissan will use Ariba sourcing solutions to drive global spend management initiatives across its operations in Japan, North America and Europe.

"Nissan is a leader among automakers in a very demanding global automotive market," said Dave McCormick, president, Ariba. "Nissan's ability to lead in such challenging times hinges on its commitment to innovation and its willingness to adopt and implement technology-based solutions that drive enhanced efficiencies and improved results, company wide."

Under the terms of the agreement, Nissan will use Ariba solutions to source a wide range of goods and services. Nissan will also leverage Ariba's supply management services, acquired following the merger with FreeMarkets, including its Buyer and Supplier Training and Auction Engineering offerings.

"We are very pleased that Nissan is choosing to leverage Ariba solutions as part of their global spend management initiatives," said Shozo Uchida, Director of Ariba Solutions Delivery (ASD) in Japan. "Nissan has a proven track record of using innovative technologies to gain and maintain competitive advantage, and we look forward to providing the company with solutions that help them achieve their most strategic goals."

About Ariba, Inc.

Ariba, Inc. is the leading provider of Spend Management (SM) solutions. Ariba helps companies realize rapid and sustainable bottom-line results. Successful companies around the world in every industry use Ariba Spend Management software and services. Ariba can be contacted in the U.S. at 1-650-390-1000 or at www.ariba.com

Ariba and the Ariba logo are registered trademarks of Ariba, Inc. Ariba Spend Management, Ariba Analysis, Ariba Buyer, Ariba Category Management, Ariba Contracts, Ariba Travel & Expense, Ariba Workforce, Ariba Invoice, Ariba eForms, Ariba Enterprise Sourcing, Ariba Supplier Network, BPM Services, Power Sourcing, Total Spend Capture and PO-Flip are trademarks or service marks of Ariba, Inc. All other trademarks are property of their respective owners.

Ariba Safe Harbor 

Safe Harbor Statement under the Private Securities Litigation Reform Act 1995: Information and announcements in this release involve Ariba's expectations, beliefs, hopes, plans, intentions or strategies regarding the future and are forward-looking statements that involve risks and uncertainties. All forward-looking statements included in this release are based upon information available to Ariba as of the date of the release, and we assume no obligation to update any such forward-looking statements. These statements are not guarantees of future performance and actual results could differ materially from our current expectations. Factors that could cause or contribute to Ariba's operating and financial results to differ materially from its current expectations include, but are not limited to: delays in development or shipment of new versions of Ariba's products and services; lack of market acceptance of Ariba's existing or future products or services; inability to continue to develop competitive new products and services on a timely basis; introduction of new products or services by major competitors; the ability to attract and retain qualified employees; difficulties in assimilating acquired companies; long and unpredictable sales cycles and the deferrals of anticipated orders; declining economic conditions, including a recession; inability to control costs; changes in the company's pricing or compensation policies; inability to successfully manage a reduction in the company's workforce; significant fluctuations in our stock price; the outcome of pending or potential future regulatory or legal proceedings relating to the restatement of our financial statements and the level of associated professional fees and expenses; the impact of acquiring Alliente, Softface and FreeMarkets, including the disruption or loss of customer, business partner, supplier or employee relationships; and the level of costs and expenses incurred by Ariba as a result of such transactions. Factors and risks associated with its business, including a number of the factors and risks described above, are discussed in Ariba's Form 10-Q filed May 17, 2004 and in its Form S-4 filed May 13, 2004.