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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.
The DIAMOND SHAMROCK CORP. began as a Cleveland-based chemical company which, in 2003, was headquartered in Dallas under the name Maxus Energy Corp.
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.
Published: September 1, 1995. Diamond Shamrock. Diamond Shamrock was one of the major oil-refining and marketing companies in Texas in 1993, with more than 6,000 employees and over $2.5 billion in revenue. It traces its origins back to three companies: Diamond Alkali, Shamrock Oil and Gas, and Sigmor Corporation.
A group of Pittsburgh, Pennsylvania, businessmen associated with the glass industry formed the Diamond Alkali Company to produce soda ash, a basic raw material of glass manufacturing. Diamond Alkali was incorporated in West Virginia in March of that year, with company headquarters established in Pittsburgh.
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...
