HF Sinclair Corp

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events.

On August 26, 2026, the Board of Directors of HF Sinclair Corporation (the “Corporation”) authorized a new $1.5 billion share repurchase program (the “New Share Repurchase Program”), effective August 26, 2026. The New Share Repurchase Program replaces all existing share repurchase authorizations, of which there was approximately $11 million remaining under the Corporation’s prior share repurchase program initially authorized in May 2024. Share repurchases under the New Share Repurchase Program may be made in the open market or through privately negotiated transactions from time to time or by other means in accordance with federal securities laws. The New Share Repurchase Program also authorizes privately negotiated repurchases from REH Advisors Inc. (“REH”), subject to REH’s interest and other limitations. The timing and amount of share repurchases under the New Share Repurchase Program will depend on market conditions and corporate, tax, regulatory and other relevant considerations. The New Share Repurchase Program may be discontinued at any time by the Board of Directors of the Corporation. In addition, the Corporation is authorized by the Board of Directors to repurchase shares in an amount sufficient to offset shares issued under the Corporation’s compensation programs.