3 of 20
3. Chevron
3. Chevron
Fortune 500 rank: 3
2010 profit: $19.0 billion

The headline number was good: Chevron boosted earnings 82% in 2010. Better refining margins and higher crude prices drove profits at the second biggest U.S. oil company. What's not so good: Chevron only managed to replace a quarter of the oil and gas it pumped out of the ground.

Last year marked Chevron's lowest reserve-replacement ratio in almost a decade, and put it far below the industry goal of replacing 100% of reserves every year. CEO John Watson is following his predecessor's moves to increase production but is running into trouble finding new projects.

NEXT: 4. Microsoft
Last updated May 10 2011: 8:38 AM ET
Top 50 Wal-Mart holds Exxon Mobil at bay and rules the Fortune 500 for the second year in a row. Which other companies made the top 50? More
They're hiring! These Fortune 100 employers have at least 350 openings each, totaling more than 96,000 jobs. What are they looking for in a new hire? More
Best big companies to work for See the 27 companies that made both the Fortune 500 and Best Companies to Work For lists this year. More