The HollyFrontier Corporation is a Fortune 500 company based in Dallas, TX. HollyFrontier is a petroleum refiner and distributor of petroleum products, from gasoline to petroleum-based lubricants and waxes. Michael C Jennings currently holds the title as CEO. Mr. Jennings, an oil expert has more than 28 years in the industry. . The company has primary refining operations in New Mexico and Utah, as well as three other states.