| Ultramar Diamond Shamrock | |
 Ultramar Diamond Shamrock6000 N. Loop 1604 west San Antonio, Texas 78249 2000 Sales: $14,292,000,000 2000 Earnings: $444,000,000 Diamond Shamrock refines and markets oil. They refine oil through 7 refineries in the U.S. They market it through 6,000 gas stations in Texas and the Southwest under the brand names Diamond Shamrock, Beacon, and Total. : | |
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