HollyFrontier is a company that operates as a petroleum refiner. It produces high-value light products such as gasoline, diesel fuel, jet fuel, specialty lubricant products, and specialty and modified asphalt. The company operates through three segments: Refining, Lubricants and Specialty Products, and HEP. HollyFrontier serves other refiners, convenience store chains, independent marketers, retailers, wholesalers, etc.