Ultramar Diamond Shamrock Corporation (UDS), based in San Antonio, Texas, is the second largest independent oil refining and marketing company in the United States. UDS, which was formed in late 1996 through the merger of Ultramar Corporation and Diamond Shamrock, Inc., owns seven refineries, located in California, Texas, Oklahoma, Colorado, Michigan, and Quebec, Canada.
Also known as:
- UDS,
- Ultramar Diamond Shamrock Corporation
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