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Diamond Shamrock (formerly known as the Ultramar Diamond Shamrock Corporation) is an American brand of gasoline stations under the ownership of the Valero Energy Corporation and is currently headquartered in San Antonio, Texas.
Learn about the history of Diamond Shamrock, a chemical company that started in Cleveland in 1910 and merged with Shamrock Oil & Gas in 1967. Find out how the company expanded, diversified, and faced environmental issues in Ohio.
Jan 2, 2002 · Valero Energy Corp. and Ultramar Diamond Shamrock Corp. have completed their $6 billion merger, making the combined firm one of the three largest US refiners.
Diamond Shamrock, Inc. owned and operated refineries of natural gas. The Company is involved in refining, processing, and marketing of petroleum products and lubricant oil.
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Diamond Shamrock was a major oil-refining and marketing company in Texas in 1993, with origins in three companies: Diamond Alkali, Shamrock Oil and Gas, and Sigmor Corporation. Learn about its history, products, facilities, and reorganization in this entry from the Handbook of Texas.
Learn about the history and operations of Diamond Shamrock, Inc., a regional refiner and marketer of petroleum products and a successor to a number of chemical companies. Find out how the company diversified into natural gas, telephone services, and environmental services.
May 7, 2001 · Valero Energy Corp. Monday said it plans to acquire Ultramar Diamond Shamrock Corp. for $6 billion, making it one of the nation's largest refiners. The boards of both companies have approved...
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