HollyFrontier 2013 Annual Report Download - page 123

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Exhibit 32.1
CERTIFICATION OF CHIEF EXECUTIVE
OFFICER UNDER SECTION 906 OF THE
SARBANES OXLEY ACT OF 2002, 18 U.S.C. § 1350
In connection with the accompanying report on Form 10-K for the period ending December 31, 2013 and filed with the
Securities and Exchange Commission on the date hereof (the “Report”), I, Michael C. Jennings, Chief Executive Officer of
HollyFrontier Corporation (the “Company”) hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that to my knowledge:
1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act
of 1934, as amended; and
2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of
operations of the Company.
Date: February 25, 2014 /s/ Michael C. Jennings
Michael C. Jennings
Chief Executive Officer and President