Tesoro Corporation is an independent petroleum refining and marketing companies in the western United States. Tesoro Logistics LP (TLLP) is a subsidiary of the Company. The Company�s subsidiaries, operating through three business segments, transport crude oil and manufacture, transport and sell transportation fuels. The refining operating segment, which owns and operates six refineries in the western United States, refines crude oil and other feedstocks into transportation fuels, such as gasoline and gasoline blendstocks, jet fuel and diesel fuel, as well as heavy fuel oils and other residual products, for sale in wholesale and bulk markets to a wide variety of customers. The Company�s retail operating segment sells transportation fuels and convenience store products in 17 states through a network of 2,264 retail stations, under the Tesoro, Shell, ARCO, Exxon, Mobil and USA Gasoline brands. The Company�s third segment is logistics assets and operations.