Tesoro Corporation is an American oil company headquartered in San Antonio, Texas. Tesoro is mainly engaged in petroleum refining and petroleum product sales. It ranked 348th in the 2013 Fortune Global 500 rankings.

Koch Industries of the United States is one of the world's largest non-listed companies. It was founded by brothers Charles Coch and David Coch. It mainly engages in crude oil exploration, petroleum refining, pipeline transportation and other businesses. It is the world's largest of road asphalt manufacturers and suppliers. Koch Industries Group owns Georgia-Pacific, Molex, etc., and has entered the papermaking, electronics and other industries. In 2014, the Koch brothers ranked sixth on Forbes' list of the world's billionaires with assets of US$40 billion.

Phillips 66 is a large energy company headquartered in Houston, USA. Its main businesses include oil and gas exploration and refining. It is one of the world's largest oil and gas companies and ranked 16th on the Fortune Global 500 in 2013.