Tesoro Corporation, together with its subsidiaries, engages in refining and marketing petroleum products in the United States. It operates in two segments, Refining and Retail. The Refining segment refines crude oil and other feed stocks into transportation fuels, such as gasoline, gasoline blend stocks, jet fuel, and diesel fuel, as well as other products, including heavy fuel oils, liquefied petroleum gas, petroleum coke, and asphalt. This segment also sells refined products in the wholesale market primarily through independent unbranded distributors; and in the bulk market primarily to independent unbranded distributors, other refining and marketing companies, utilities, railroads, airlines and marine, and industrial end-users in the western United States. It owns and operates 7 refineries with a combined crude oil capacity of approximately 675 thousand barrels per day. The Retail segment sells gasoline, diesel fuel, and convenience store items through company-operated retail stations, and third-party branded dealers and distributors in the western United States. As of February 6, 2013, this segment operated approximately 1,400 branded retail stations, including approximately 595 company operated stations under the Tesoro, Shell, and USA Gasoline brands. Tesoro Corporation was founded in 1939 and is headquartered in San Antonio, Texas.

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