Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

(a) Amendment to Bylaws.

On September 14, 2021, the Board of Directors (the "Board") of HollyFrontier Corporation (the "Corporation") approved an amendment and restatement of the Corporation's amended and restated by-laws (the "By-Laws", and as further amended and restated, the "Amended By-Laws") effective as of such date. The By-Laws were amended and restated to eliminate the super majority voting requirement for a stockholder amendment of the Corporation's By-Laws and replace it with a simple majority voting standard.

The Amended By-Laws are attached hereto as Exhibit 3.1 and incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

3.1 Amended and Restated By- L aws of HollyFrontier Corporation.

104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

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