Also known as:
Ultramar an independent refiner operating in the US and Canada.
The company was ultimately merged with Diamond Shamrock to form Ultramar Diamond Shamrock (UDS)
Wilmington (1988 - 1997)
Dartmouth (1983 - 1997)
Holyrood (1961 - 1997)
Quebec City (1971 - 1997)
1961 - Ultramar opened Holyrood, Nova Scotia refinery
1971 - Ultramar opened Quebec City refinery
1983 - Ultramar shut down Holyrood, Nova Scotia refinery
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