Diamond Shamrock

Diamond Shamrock Corp. or Diamond Shamrock Refining and Marketing was an oil refinery and gas station company in the United States, headquartered in San Antonio, Texas.

This article is about the company. For the building formerly known as the Diamond Shamrock Building, see 1100 Superior.
Diamond Shamrock
FormerlyDiamond Alkali, Shamrock Oil and Gas, and Sigmor
IndustryOil, gas, chemicals
Founded1910 (1910) in Pittsburgh, Pennsylvania (as Diamond Alkali)
August 29, 1929 (1929-08-29) (as Shamrock Oil and Gas)
1967 (1967) (as Diamond Shamrock)
FoundersJohn Sheerin, TR Evans, Thomas E. Turner
FateAcquired by Valero Energy Corporation
Headquarters
San Antonio
,
Texas
Area served
California, Colorado, Georgia, New Mexico, Oklahoma, South Carolina, Texas
Websitewww.valero.com

Since 2001, it operates as a brand of Valero and has withdrawn the brand from a majority of Texas gas stations and had converted most of the stores to Valero or sold them off to Texaco or other companies.

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