HF Sinclair Corporation announced that As previously reported that Board appointed Ross B. Matthews and Norman J. Szydlowski to serve as members of the Board, effective as of March 15, 2022. On June 8, 2022, Ross B. Matthews was appointed to serve as a member of the Finance Committee of the Board and Norman J. Szydlowski was appointed to serve as a member of the Nominating, Governance and Social Responsibility Committee and the Environmental, Health, Safety, and Public Policy Committee of the Board.