Unocal Corporation

Unocal Corporation

Union Oil Company of California, dba Unocal /ˈjuːnɵkæl/ is a defunct company that was a major petroleum explorer and marketer in the late 19th century, through the 20th century, and into the early 21st century. It was headquartered in El Segundo, California, United States.

On August 10, 2005, Unocal merged with Chevron Corporation and became a wholly owned subsidiary. Unocal has now ceased operations as an independent company, but continues to conduct many operations as Union Oil Company of California, a Chevron company.