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15. Occidental Petroleum
Fortune rank: 15
2008 profit: $6.86 Billion
Record oil prices - the price of a barrel of oil reached $145 in 2008 - drove profits at the fourth largest U.S. oil and gas company known for boosting oil production in hard-to-reach reserves.

Even with a drop in prices, Oxy, Texas's biggest producer, sold oil in 2008 for an average 36% more than the previous year.

NEXT: Verizon Communications
Last updated April 20 2009: 11:09 AM ET
2009 Fortune 500
Top 50
Top 50
Exxon Mobil pushes Wal-Mart aside to retake the No. 1 slot this year. Which other companies made the top 50 this year? More
They're hiring!
They're hiring!
As many big companies are announcing mass layoffs, these Fortune 100 employers have at least 150 openings each. More
The biggest losers
The biggest losers
Companies from AIG to United Airlines, from ConocoPhillips to Motorola lost billions of dollars last year. Who lost the most? More
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