On May 9, 2024, Indira Agarwal, Vice President, Controller and Chief Accounting Officer (principal accounting officer) of HF Sinclair Corporation (Corporation), notified the Corporation that she is resigning from her role effective May 28, 2024 to pursue another opportunity. Ms. Agarwal?s resignation was not the result of any disagreement with the Corporation or its Board of Directors. Until a permanent successor is appointed, Atanas H. Atanasov, the Corporation?s Executive Vice President and Chief Financial Officer, will assume the responsibilities of the Corporation?s principal accounting officer, effective as of May 28, 2024, in addition to his current role.