UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): May 5, 2021 (May 4, 2021)

HOLLYFRONTIER CORPORATION

(Exact name of registrant as specified in its charter)

Delaware 001-03876 75-1056913

(State of

Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification Number)

2828 N. Harwood, Suite 1300, Dallas, Texas75201

(Address of Principal Executive Offices)

(214) 871-3555

(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-Kfiling 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-12under the Exchange Act (17 CFR 240.14a-12)

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

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

Securities registered pursuant to Section 12(b) of the Act:

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 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-2of the Securities Exchange Act of 1934 (§240.12b-2of 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. ☐

EXPLANATORY NOTE

HollyFrontier Corporation (the 'Company') is filing this Amendment No. 1 on Form 8-K/A (this'Amendment No.1') to its Current Report on Form 8-K originallyfiled with the Securities and Exchange Commission on May 4, 2021 (the 'Original Form 8-K'), solely to re-furnish Exhibit 99.2,'HollyFrontier Presentation to Investors regarding Puget Sound Refinery Acquisition,' to correct the ninth bullet on slide 5. Except as described above, this Amendment No. 1 does not amend, modify or update the information in the Original Form 8-K.

The information provided in Exhibit 99.2 shall not deemed to be 'filed' for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be incorporated by reference in any filing made by HollyFrontier pursuant to the Securities Act of 1933, as amended, other than to the extent that such filing incorporates by reference any or all of such information by express reference thereto.

Item 9.01

Financial Statements and Exhibits.

(d)

Exhibits

Exhibit
No.

Description

99.2 HollyFrontier Presentation to Investors regarding Puget Sound Refinery Acquisition.
104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

HOLLYFRONTIER CORPORATION
By:

/s/ Richard L. Voliva III

Name: Richard L. Voliva III
Title: Executive Vice President and Chief Financial Officer

Date: May 5, 2021

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HollyFrontier Corporation published this content on 05 May 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 05 May 2021 10:10:09 UTC.