6. Ariba, $599 Million (analyst estimates)
CEO: Robert Calderoni
Ariba, which was acquired last year by SAP as a means of strengthening the German vendor's position in the cloud-based world, leverages cloud-based collaborative commerce applications to support a Web-based trading community for enterprise-level commerce. Ariba claims that its network supports daily transactions of nearly $1.1 billion per day in more than 140 countries. The service line is aimed at increasing competitiveness and efficiencies in the midst of reduced inventories, reduced infrastructure, outsourced processes and extended supply chains. The acquisition is clearly part of a strategic move by SAP with respect to the cloud.