On January 13, 2017, the Board of Directors of HollyFrontier Corporation appointed Richard L. Voliva III as Executive Vice President and Chief Financial Officer of the company effective March 1, 2017. In addition, Douglas S. Aron, who currently serves as Executive Vice President and Chief Financial Officer of the company, notified the Board on January 12, 2017 that he will retire from his position as Executive Vice President and Chief Financial Officer at the end of day on February 28, 2017. Mr. Voliva currently serves as Senior Vice President, Strategy of the Company, a position he has held since June 2016.

Mr. Voliva will resign from such position effective upon his appointment as Executive Vice President and Chief Financial Officer of the company. Mr. Voliva also serves as Senior Vice President and Chief Financial Officer of Holly Logistic Services, L.L.C. since July 2016.