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4. Hewlett-Packard
Fortune 500 rank: 14
CEO Mark Hurd's turnaround efforts produced sales that broke the $100 billion mark in 2007, with profit margins of 17%. Earnings hit $7.3 billion as HP extended its leads in laptop sales and continued to steal market share from Dell.

NEXT: 5. Intel
Last updated April 24 2008: 11:04 AM ET