1. IBM Global Services
2016 Rank: 1
Top Executive: Ginni Rometty, President & CEO
Location: Armonk, N.Y.
Market leader IBM Global Services consists of two main businesses. Business Services includes consulting, global process services, and application management, while Technology Services covers cloud and systems, mobility, networking, resiliency, and technology support services. First fiscal quarter 2017 revenue slipped, with Business Services down 3.0 percent and Technology Services down 2.5 percent over last year.