4. Verizon Communications
Fortune 500 Rank: No. 16
Revenue: $115.8 billion
Top Executive: CEO Lowell McAdam
New York-based Verizon also slipped one spot this year from No. 15 in 2012. The telecom company continued to expand its mobile broadband network while offering a range of Internet and cloud services through channel partners.
Earlier this year the company sought to simplify its channel strategy by bringing six partner programs under one umbrella with five solution tracks -- networks, mobility, advanced communications, cloud/applications and machine-to-machine -- in which partners can specialize and become certified.