Union Oil Company of California, dba Unocal 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. The company was founded on October 17, 1890, when it was incorporated in Santa... Paula, California, as the Union Oil Company of California. The company was formed by the merger of co-founders Lyman Stewart, Thomas Bard, and Wallace Hardison's holdings. Union Oil moved its headquarters to Los Angeles, in 1901. The original headquarters in Santa Paula is a California Historical Landmark. About 1910, Union Oil made a strategic alliance with the Independent Producers Agency, a group of small oil producers, to build pipelines from the Kern County oil fields to Union Oil facilities on the Pacific coast.
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