CITGO Petroleum Corporation is headquartered in Houston, Texas, and has 3,700 employees. The company refines, markets and transports gasoline, diesel fuel, jet fuel, lubricants, petrochemicals, and other petroleum-based industrial products. CITGO owns and operates three highly complex crude oil refineries located in the United States, making the company one of the largest refiners in the nation. The company markets motor fuels to independent marketers who then sell their motor fuels to nearly 6,000 branded retail outlets.