page_title: Andeavor
section_title: History
hierarchical_section_title: Andeavor / History
caption_attribution_description: The new Tesoro Corporation headquarters in San Antonio, Texas, USA was designed by architect Marshall Strabala, Director of Design of Gensler. Tesoro's employees moved into the new corporate campus in July 2009. The building is LEED Certified (Silver) by the US Green Building Council. Strabala is a LEED certified architect.
context_page_description: Andeavor was a Fortune 100 and a Fortune Global 500 company headquartered in San Antonio, Texas, with 2017 annual revenues of $35 billion, and over 14,000 employees worldwide. Based on 2017 revenue, the company ranked No. 90 in the 2018 Fortune 500 list of the largest United States corporations by total revenue.
  Andeavor was an independent refiner and marketer of petroleum products, operating ten refineries in the Western United States with a combined rated crude oil capacity of approximately 1,200,000 barrels per day. Andeavor's retail-marketing system included approx. 3,000 branded retail gas stations, of which more than 595 were company-operated under its own Tesoro brandname, as well as Shell, ExxonMobil, ARCO, and USA Gasoline brands.
  Andeavor was acquired by Marathon Petroleum on October 1, 2018.
context_section_description: Andeavor, formerly Tesoro, was founded in 1968 by Dr. Robert V. West Jr, and was primarily engaged in petroleum exploration and production. Tesoro is the word for treasure (or treasury) in Italian and Spanish. In 1969, Tesoro began operating its first refinery, near Kenai, Alaska. Tesoro became the first Fortune 500 company to be headquartered in San Antonio, Texas.
  Beginning in the late 1990s, Tesoro grew through a series of acquisitions and initiatives that created Tesoro Corporation, the company focusing on a single core business: petroleum refining and marketing. Acquisitions expanded refining capacity from 72,000 barrels per day (11,400 m³/d) to approximately 664,000 barrels per day (105,600 m³/d).
  Prior to its acquisition by Marathon Petroleum in 2018, Andeavor was the third-largest independent petroleum refining and marketing company in the United States.
  Milestones in the company's history are:
  1998: acquires second refinery (after Nikiski) in Kapolei, Hawaii along with petroleum terminals and approximately 30 retail stations in Hawaii from BHP Americas - also acquires the former Shell refinery at Anacortes, Washington;
  1999:	sold exploration and production operations;
  2001:	purchased refineries in Mandan, North Dakota, and Salt Lake City, Utah from BP Amoco;
  2002: acquired Golden Eagle Refinery in Martinez, California from Ultramar (Valero);
  2003: sold Tesoro Marine Services to Martin Midstream LLC: Tesoro Marine Services were operating fueling and supply terminals servicing US Gulf Coast oil and gas exploration - also made a series of refinery acquisitions that boosted the company's capacity output and positioned it for future expansion in key growth markets throughout the Western United States;
  2005:	largest capital expansion program in the corporation's history and record earnings;
  2007: announcement of purchase of Shell's refinery at Los Angeles refinery and approximately 250 Southern California retail stations;
  2007: Tesoro acquires USA Gasoline;
  2009: Tesoro employees move into a newly completed corporate campus in July.
  2011: Tesoro forms Tesoro Logistics LP (TLLP) as a master limited partnership;
  2011: Tesoro acquires 250 ARCO (Thrifty Style Stations) and Thrifty Stations in Southern California;
  2012: Tesoro changes the 250 ARCO (Thrifty Style Stations) and Thrifty Stations in Southern California to USA Gasoline;
  2013: Tesoro purchases the Carson Refinery and the ARCO brand from BP;
  2013: Tesoro sells its Kapolei refinery to Par Petroleum (now Par Pacific Holdings).
  2016 Tesoro purchased Dakota Prairie Refining in Dickinson, North Dakota from WBI Energy.  Construction of the refinery was completed in the spring of 2015.
  2016: Tesoro Corp has agreed to buy Western Refining for $4.1 billion.
  2016/17: Par Pacific Inc. rebrands its Tesoro and 76 gas stations as Hele.
  2017: Tesoro announces that it will be changing its name to Andeavor following its acquisition of Western Refining. On August 1, 2017, the company changed its ticker symbol to "ANDV" from "TSO".
  2018: Andeavor announces that they have entered into a definitive merger agreement with Marathon Petroleum Corporation under which Marathon Petroleum will acquire all of Andeavor's outstanding shares. The merger was closed on October 1.
caption: Tesoro's corporate HQ, completed in 2009, at San Antonio, TX.
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