HollyFrontier Announces Promotion of Tim Go to President and Chief Operating Officer

HollyFrontier Corporation (NYSE: HFC) (“HollyFrontier”) today announced the promotion of Tim Go to the position of President and Chief Operating Officer of HollyFrontier effective immediately. As President and Chief Operating Officer, Mr. Go’s responsibilities will include oversight over HollyFrontier’s Refining and Lubricants and Specialty Products segments. Mike Jennings, who previously served as Chief Executive Officer and President of HollyFrontier, will continue to serve as Chief Executive Officer of HollyFrontier.

Mike Jennings, Chief Executive Officer of HollyFrontier commented, “Since joining the company in June 2020, Tim has provided significant leadership and direction in our efforts to strengthen and grow HollyFrontier’s Refining segment. In 2021, he also played a key role in the company’s acquisition and integration of the Puget Sound refinery. In recognition of these contributions, we are excited to announce Tim’s promotion to the position of President and Chief Operating Officer and look forward to his continued contributions in his new role.”

Mr. Go has served as Executive Vice President and Chief Operating Officer of HollyFrontier since June 2020. Prior to joining HollyFrontier, he served as Chief Executive Officer of the general partner of Calumet Specialty Products Partners, L.P. (“Calumet”) from January 2016 to April 2020 and retired from Calumet in June 2020. Prior to joining Calumet, Mr. Go worked in roles of increasing responsibility at Flint Hills Resources and in downstream operations at ExxonMobil.

About HollyFrontier Corporation:

HollyFrontier Corporation, headquartered in Dallas, Texas, is an independent petroleum refiner and marketer that produces high value light products such as gasoline, diesel fuel, jet fuel and other specialty products. HollyFrontier owns and operates refineries located in Kansas, Oklahoma, New Mexico, Washington and Utah and markets its refined products principally in the Southwest U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states. In addition, HollyFrontier produces base oils and other specialized lubricants in the U.S., Canada and the Netherlands, and exports products to more than 80 countries. HollyFrontier also owns a 57% limited partner interest and a non-economic general partner interest in Holly Energy Partners, L.P., a master limited partnership that provides petroleum product and crude oil transportation, terminalling, storage and throughput services to the petroleum industry, including HollyFrontier Corporation subsidiaries.

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HollyFrontier Corporation Craig Biery, 214-954-6510 Vice President, Investor Relations or Trey Schonter, 214-954-6510 Investor Relations