Tesoro Corp. engages in the refining and marketing of petroleum products. It operates through three segments: Refining, TLLP and Retail. The Refining segment sells refined products to unbranded marketers and opportunistically exports refined products to foreign markets. The TLLP segment owns, operates, develops and acquires logistics assets. The Retail segment sells gasoline, diesel fuel and convenience store items through company-operated retail stations and branded jobber dealers. The company was founded by West V. Robert, Jr. in 1968 and is headquartered in San Antonio, TX.