DS Download - Ultramar Diamond Shamrock

Ultramar Diamond Shamrock

Also known as:

UDS, Ultramar (absorbed), Diamond Shamrock (absorbed), Shamrock (absorbed), Diamond (absorbed)

Ultramar Diamond Shamrock was a large independent refiner operating in the US and Canada that was formed by the merger of the Diamond, Shamrock and Ultramar refining companies, and the acquisition of the North American refining assets of Total.

The company was ultimately acquired by Valero.

Refining history

1933 - Shamrock opened McKee refinery

1950 - Shamrock acquired Saginaw, Michigan refinery from Louis Rose

1954 - Shamrock shut down Saginaw, Michigan refinery

1961 - Ultramar opened Holyrood, Nova Scotia refinery

1967 - Shamrock and Diamond merged to form Diamond Shamrock

1971 - Ultramar opened Quebec City refinery

1983 - Ultramar shut down Holyrood, Nova Scotia refinery

1984 - Diamond Shamrock acquired Three Rivers refinery from Sigmor

1988 - Ultramar acquired Wilmington refinery from Union Pacific Resources

1990 - Ultramar acquired Dartmouth, Nova Scotia refinery from Texaco

1994 - Ultramar shut down Dartmouth, Nova Scotia refinery

1997 - Ultramar and Diamond Shamrock merged to form Ultramar Diamond Shamrock

1997 - Ultramar Diamond Shamrock acquired North America refining assets of Total (Commerce City; Ardmore; Alma, Michigan)

1999 - Shut down Alma, Michigan refinery

2002 - Company acquired by Valero

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