Top 10 Software it companies in the world?

Top 10 software companies -- CEOs 1. Microsoft -- Steve Ballmer 2. IBM -- Samuel J. Palmisano 3. Oracle -- Larry Ellison 4. SAP -- Henning Kagermann 5. HP -- Mark V Hurd 6. Symantec -- John W Thompson 7. CA Inc -- John A Swainson 8. Nintendo -- Satoru Iwata 9. Electronic Arts -- John Riccitiello 10. Adobe Systems -- Shantanu Narayen