The Annual Meeting of Stockholders of HF Sinclair Corporation will be held on Wednesday June 8, 2022, at 8:30 a.m. CT. Stockholders of record will be able to vote and ask questions online during the meeting. The Annual Meeting will be held in a virtual meeting format only. If you would like to attend the virtual meeting and have your 16-digit control number included on your proxy card, please go to www.virtualshareholdermeeting.com/DINO2022 15 minutes before the start of the meeting to log in. Stockholders who do not have a control number may gain access to the meeting by logging into their brokerage firm’s website and selecting the stockholder communications mailbox to link through to the meeting.