As a leading independent refiner and marketer of petroleum products, Tesoro, through its subsidiaries, operates seven refineries primarily in the western United States with a combined crude oil capacity of approximately 660,000 barrels per day (bpd). The seven refineries are located in:

* Anacortes,Wash.
* Mandan, N.D.
* Kapolei, Hawaii
* Martinez, Calif.
* Kenai,Alaska
* Salt Lake City, Utah
* Wilmington, California

Tesoro's retail marketing system includes over 900 branded retail stations, of which more than 445 are company operated under the Tesoro®, Shell®, Mirastar® and USA Gasoline^TM brands. Tesoro's commercial marketing system includes sales of jet and marine fuels.