Andeavor is an independent petroleum refining and marketing company. The company has three segments: Marketing, which sells gasoline and diesel fuel in the western and mid-continent U.S. through Retail, Branded, and Unbranded channels along with convenience store products; Refining, which buys and refines crude oil and other feedstocks into transportation fuels; and Logistics, which transports, stores and distributes crude oil, feedstocks and refined products through its terminals and pipelines or terminals and pipelines owned by Andeavor Logistics LP and third-parties in its market areas as well as through purchases and exchange arrangements with other refining and marketing companies.

Marathon Petroleum is an independent petroleum refining and marketing, retail and midstream company. The company's segments include: Refining and Marketing, which refines crude oil and other feedstocks at its refineries, purchases refined products and ethanol for resale and distributes refined products; Retail, which sells transportation fuels and convenience products in the retail market across the U.S.; and Midstream, which transports, stores, distributes and markets crude oil and refined products via refining logistics assets, pipelines, terminals, towboats and barges, gathers, processes and transports natural gas, and gathers, transports, fractionates, stores and markets natural gas liquids.