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3. Chevron
Fortune 500 rank: 3
2007 profit: $18.69 billion

Earnings rose 9% in 2007 at the second-biggest U.S. oil company, as sales increased 5%.

Chevron cashed in on record crude prices, which jumped nearly 60% during the year. That helped the company move up four places from last year on Fortune's most-profitable list.

NEXT: J.P. Morgan Chase & Co.

Last updated April 24 2008: 11:07 AM ET