Top 10 Companies by Revenue

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3 of 10

John Edwardson

CDW
Vernon Hills, Ill.

No. 4,834

2010 Revenue: $8.8 billion 

Three-Year Growth: 8.06%

This provider of technology solutions got its start in 1982 when a young man named Michael Krasny sold his used IBM computer through a classified ad, then decided it was about time someone start selling computers directly to customers. He founded CDW in 1984. Today the company employs more than 6,300 workers. At the end of June, John Edwardson, who more than doubled company revenues to $8.8 billion over his tenure, was succeeded as CEO by Thomas Richardson, who had previously served the company as president and COO.