Sunoco Competitor is a term used to describe two major oil companies, Hess and Citgo. Hess is a four letter company that is based in the United States and is one of the largest integrated energy companies in the world. Citgo is a five letter company that is based in the United States and is owned by PDVSA, a Venezuelan state-owned oil and natural gas company. Both Hess and Citgo are competitors of Sunoco, an American petroleum and petrochemical manufacturer.