16. Tech Data
Fortune 500 Rank: No. 119
Revenue: $25.4 billion
Top Executive: CEO Robert Dutkowsky
Clearwater, Fla.-based Tech Data's ranking dropped from No. 109 last year. Tech Data has ramped up its efforts in mobility and cloud computing in recent years through its TDMobility and TDCloud programs. In fiscal 2013 ended Jan. 31, the distributor sold $2 billion worth of tablet computers, twice the volume of the year before.