 DALLAS--BUSINESS WIRE--HollyFrontier Corporation NYSE: HFC the Company plans to announce results for its quarter ending December 31, 2021 on February 23, 2022, before the opening of trading on the NYSE. The Company has scheduled a webcast conference on February 23, 2022 at 8:30 a.m. Eastern time to discuss financial results. This webcast may be accessed at: An audio archive of this webcast will be available using the above noted link through M 