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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.
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In the summer of 1967 Diamond laid the foundation for expansion into the petrochemicals field by merging with Shamrock Oil and Gas Company to form Diamond Shamrock Corporation (Diamond). The merger combined Diamond Alkali ’ s chemical assets with Shamrock Oil ’ s production interests in oil, gas, and petrochemical fertilizers and its ...
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.
May 7, 2001 · By the OGJ Online Staff. HOUSTON, May 7 -- 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....
Dec 19, 2001 · By the OGJ Online StaffHOUSTON, Dec. 19 -- The US Federal Trade Commission approved the merger of Valero Energy Corp. and Ultramar Diamond Shamrock Corp. The merger will be completed Dec. 31.
Jan 2, 2002 · HOUSTON, Jan. 2-- Valero Energy Corp. and Ultramar Diamond Shamrock Corp. completed their $6 billion merger at 11:59 p.m. Dec. 31, making the combined firm one of the three largest US refiners.
Valero completes its largest transaction to date: merging with San Antonio-based Ultramar Diamond Shamrock, bringing six more refineries into Valero’s portfolio: Ardmore, Oklahoma; Wilmington, California; Denver, Colorado*; McKee (Sunray, Texas) and Three Rivers, Texas; and Lévis, Quebec (later named Jean Gaulin Refinery).
