Also known as:
Blue Island (1943 - 2001)
Wood River (1968 - 2003)
Delaware City (2004 - 2005)
Lima (1998 - 2005)
Memphis (2003 - 2005)
Port Arthur (1955 - 2005)
1943 - As Clark, acquired Blue Island, Illinois refinery
1968 - Acquired Hartford (Wood River), Illinois refinery from Sinclair
1981 - Company acquired by APEX (but remained Clark)
1987 - Filed for bankruptcy
1992 - Acquired by Horsham (but remained Clark)
1995 - Acquired Port Arthur refinery from Chevron
1998 - Acquired Lima refinery from BP
1999 - Company acquired by Blackstone and Occidental (but remained Clark)
2000 - Name changed to Premcor
2001 - Shut down Blue Island, Illinois refinery
2003 - Sold Hartford (Wood River) refinery to ConocoPhillips
2003 - Acquired Memphis refinery from Williams
2004 - Acquired Delaware City refinery from Motiva
2005 - Company acquired by Valero