Tesoro Corporation, a Fortune 100 company, is an independent refiner and marketer of petroleum products. It is a publicly held business that operates more than five refineries in the western United States. The company s retail marketing system includes over 870 stations under the Tesoro, Shell, Mirastar and USA Gasoline brands. Tesoro Corporation also maintains a staff of nearly 5,600 employees. Founded in 1968, it specializes in the commercial sales of jet and marine fuel products for the marine and aviation industries. The company is a producer of distillates and markets wholesale motor fuel products to unbranded dealers. Tesoro Corporation operates bulk terminals in Alaska, California, Washington, Hawaii and Idaho. The company s subsidiaries include Tesoro Alaska Company and Tesoro Refining and Marketing Company.