22. Computer Sciences Corp.
Fortune 500 Rank: No. 176
Revenue: $15.9 billion
Top Executive: President and CEO John Michael Lawrie
Falls Church, Va.-based Computer Sciences, often just called "CSC," fell from No. 162 last year. The information technology services company was No. 4 on CRN's Solution Provider 500 list in 2012. Last month, the company signed a deal with Hewlett-Packard to join HP's managed security services program.