Item 1.01. Entry into a Material Definitive Agreement.

On April 30, 2021, HollyFrontier Corporation (the "Company"), as borrower, MUFG Bank, Ltd., as administrative agent, and each of the financial institutions party thereto as lenders, entered into that certain Second Amendment to Senior Unsecured 5-Year Revolving Credit Agreement (the "Amendment"), which amended certain terms of that certain Senior Unsecured 5-Year Revolving Credit Agreement, dated as of July 1, 2014 by and among the Company, MUFG Bank, Ltd., as administrative agent, and each of the financial institutions party thereto from time to time as lenders (as amended, restated, supplemented or otherwise modified, the "Credit Agreement"). Pursuant to the Amendment, the maximum commitment amount under the Credit Agreement will continue to be $1,350,000,000, and the maturity date will be extended to April 30, 2026.

Indebtedness under the Credit Agreement will bear interest, at the Company's option based on the currency of such indebtedness, at either (a) a base rate equal to the highest of the NYFRB Rate (as defined in the Credit Agreement) plus 1/2 of 1%, the Adjusted LIBO Rate (as defined in the Credit Agreement) for a one-month interest period plus 1% and the prime rate (as publicly announced from time to time by the administrative agent), as applicable, plus an applicable margin (ranging from 0.25% to 1.125%), (b) at a rate equal to the CDOR Rate (as defined in the Credit Agreement) plus an applicable margin (ranging from 1.25% to 2.125%) or (c) at a rate equal to the Adjusted LIBO Rate plus an applicable margin (ranging from 1.25% to 2.125%). The Company incurs a commitment fee on the unused portion of the commitments (which calculation of such unused portion excludes amounts borrowed as swingline loans except to the extent that a lender has purchased a participation in a swingline loan) at a rate ranging from 0.150% to 0.350%. In each case, the applicable margin and commitment fee rate is based upon the rating issued from time to time by Moody's and S&P, as applicable, to the Company's senior, unsecured, non-credit enhanced long-term debt.

The foregoing description of the Amendment does not purport to be complete. The description of the Amendment herein is qualified by reference to the copy of the Amendment filed as Exhibit 10.1 to this report, which is incorporated by reference into this report in its entirety.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an


           Off-Balance Sheet Arrangement of a Registrant.

The information set forth in Item 1.01 is incorporated into this Item 2.03 by reference.

Item 9.01 Financial Statements and Exhibits.




(d)  Exhibit.



10.1*+       Second Amendment to Senior Unsecured 5-Year Revolving Credit
           Agreement, dated as of April 30, 2021, among HollyFrontier Corporation,
           as borrower, MUFG Bank, Ltd., as administrative agent, and the lenders
           party thereto.*

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




* Filed Herewith

+ Schedules and exhibits have been omitted pursuant to Item 601(a)(5) of

Regulation S-K. The registrant agrees to furnish supplementally a copy of the

omitted schedules and exhibits to the SEC upon request.

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