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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.
1996: Diamond Shamrock Corporation and Ultramar Corporation merge to form Ultramar Diamond Shamrock Corporation. Company History: Ultramar Diamond Shamrock Corporation (UDS), based in San Antonio, Texas, is the second largest independent oil refining and marketing company in the United States.
Diamond Shamrock is a successor to a number of companies, the earliest being Diamond Alkali Company formed in 1910 as a chemical company. 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.
Sep 1, 1995 · 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.
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.
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What is Diamond Shamrock?
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.
