Fortune 500 rank: 16 (Previous rank: 15)
2006 Revenues (millions): $91,051
Headquarters: San Antonio, TX
Get quote: VLO
The oil refiner and gasoline retailer benefited from high crude oil prices last year. Its $5.5 billion in earnings - a 52% increase - made 2006 the company's most profitable year ever. But like other oil giants, it had a slow fourth quarter as oil prices dropped from their summertime highs.
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