HOLLYFRONTIER CORPORATION (Exact Name of Registrant As Specified in Its Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10-K For the fiscal year ended December 31, 2020 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR For the transition period from _____________ to ______________ Commission File Number 1-3876 HOLLYFRONTIER CORPORATION (Exact name of registrant as specified in its charter) Delaware 75-1056913 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 2828 N. Harwood, Suite 1300 Dallas Texas 75201 (Address of principal executive offices) (Zip Code) (214) 871-3555 Registrant’s telephone number, including area code ------------------------------------------------------------------- Securities registered pursuant to 12(b) of the Securities Exchange Act of 1934: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock $0.01 par value HFC New York Stock Exchange Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 (d) of the Act. Yes ¨ No ☒ Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐ Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ 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. ☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C.7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒ On June 30, 2020, the last business day of the registrant's most recently completed second fiscal quarter, the aggregate market value of the Common Stock, par value $0.01 per share, held by non-affiliates of the registrant was approximately $4.3 billion, based upon the closing price on the New York Stock Exchange on such date. (This is not deemed an admission that any person whose shares were not included in the computation of the amount set forth in the preceding sentence necessarily is an “affiliate” of the registrant.) 162,414,838 shares of Common Stock, par value $.01 per share, were outstanding on February 16, 2021. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's proxy statement for its annual meeting of stockholders to be held on May 12, 2021, which proxy statement will be filed with the Securities and Exchange Commission within 120 days after December 31, 2020, are incorporated by reference in Part III. Table of Content TABLE OF CONTENTS Item Page PART I Forward-Looking Statements 3 Definitions 4 1 and 2. Business and Properties 6 1A. Risk Factors 23 1B. Unresolved Staff Comments 40 3. Legal Proceedings 41 4. Mine Safety Disclosures 43 PART II 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 44 6. Selected Financial Data 45 7. Management's Discussion and Analysis of Financial Condition and Results of Operations 46 7A. Quantitative and Qualitative Disclosures about Market Risk 61 Reconciliations to Amounts Reported Under Generally Accepted Accounting Principles 61 8. Financial Statements and Supplementary Data 63 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 115 9A. Controls and Procedures 115 9B. Other Information 115 PART III 10. Directors, Executive Officers and Corporate Governance 115 11. Executive Compensation 115 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 115 13. Certain Relationships and Related Transactions, and Director Independence 116 14. Principal Accounting Fees and Services 116 PART IV 15. Exhibits, Financial Statement Schedules 116 Signatures 122 2 Table of Content PART I FORWARD-LOOKING STATEMENTS This Annual Report on Form 10‑K contains certain “forward-looking statements” within the meaning of the federal securities laws. All statements, other than statements of historical fact included in this Form 10-K, including, but not limited to, those under “Business and Properties” in Items 1 and 2, “Risk Factors” in Item 1A, “Legal Proceedings” in Item 3 and “Management's Discussion and Analysis of Financial Condition and Results of Operations” in Item 7, are forward- looking statements. Forward-looking statements use words such as “anticipate,” “project,” “expect,” “plan,” “goal,” “forecast,” “intend,” “should,” “would,” “could,” “believe,” “may,” and similar expressions and statements regarding our plans and objectives for future operations. These statements are based on management's beliefs and assumptions using currently available information and expectations as of the date hereof, are not guarantees of future performance and involve certain risks and uncertainties. All statements concerning our expectations for future results of operations are based on forecasts for our existing operations and do not include the potential impact of any future acquisitions. Although we believe that the expectations reflected in these forward-looking statements are reasonable, we cannot assure you that our expectations will prove to be correct. Therefore, actual outcomes and results could materially differ from what is expressed, implied or forecast in these statements. Any differences could be caused by a number of factors including, but not limited to: • the extraordinary market environment and effects of the COVID-19 pandemic, including a significant decline in demand for refined petroleum products in markets we serve; • risks and uncertainties with respect to the actions of actual or potential competitive suppliers and transporters of refined petroleum products or lubricant and specialty products in our markets; • the spread between market prices for refined products and market prices for crude oil; • the possibility of constraints on the transportation of refined products or lubricant and specialty products; • the possibility of inefficiencies, curtailments or shutdowns in refinery operations or pipelines, whether due to infection in the workforce or in response to reductions in demand; • the effects of current and future governmental and environmental regulations and policies, including the effects of current and future restrictions on various commercial and economic activities in response to the COVID-19 pandemic; • the availability and cost of our financing; • the effectiveness of our capital investments and marketing strategies; • our efficiency in carrying out and consummating construction projects, including our ability to complete announced capital projects, such as the conversion of the Cheyenne Refinery to a renewable diesel facility and the construction of the Artesia renewable diesel unit and pretreatment unit, on time and within budget; • our ability to timely obtain or maintain permits, including those necessary for operations or capital projects, • our ability to acquire refined or lubricant product operations or pipeline and terminal operations on acceptable terms and to integrate any existing or future acquired operations; • the possibility of terrorist or cyberattacks and the consequences of any such attacks; • general economic conditions, including uncertainty regarding the timing, pace and extent of an economic recovery in the United States; • continued deterioration in gross margins or a prolonged economic slowdown due to the COVID-19 pandemic which could result in an impairment of goodwill and / or additional long-lived asset impairments; and • other financial, operational and legal risks and uncertainties detailed from time to time in our SEC filings. Cautionary statements identifying important factors that could cause actual results to differ materially from our expectations are set forth in this Form 10-K, including without limitation the forward-looking statements that are referred to above. You should not put any undue reliance on any

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