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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
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