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( Mark One ) ☑ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Form 10 - K ANNUAL REPORT PURSUANT TO SECTION 18 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Delaware ( State or other jurisdiction of incorporation or organization ) 7102 Commerce Way ( Address of principal executive offices ) Commission file number 001-38142 DELEK US HOLDINGS , INC . ( Exact name of registrant as specified in its charter ) Delek Brentwood US Tennessee ( 615 ) 771-6701 ( Registrant's telephone number , including area code ) Not Applicable 35-2581557 ( I.R.S. Employer Identification No. ) ( Former name , former address and former fiscal year , if changed since last report ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , par value $ 0.01 Rights to Purchase Series A Junior Participating Preferred Stock , par value $ 0.01 Trading Symbol DK 37027 ( Zip Code ) Name of each exchange on which registered New York Stock Exchange New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None 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 every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( Section 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. 4262 ( 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 Act ) . Yes ☐ No ☑ The aggregate market value of the common stock held by non - affiliates as of June 30 , 2020 was approximately $ 1,265,400,000 , based upon the closing sale price of the registrant's common stock on the New York Stock Exchange on that date . For purposes of this calculation only , all directors and officers subject to Section 16 ( b ) of the Securities Exchange Act of 1934 are deemed to be affiliates . At February 19 , 2021 , there were 73,781,666 shares of the registrant's common stock , $ .01 par value , outstanding ( excluding securities held by , or for the account of , the Company or its subsidiaries ) . Documents incorporated by reference Portions of the registrant's definitive Proxy Statement to be delivered to stockholders in connection with the 2021 Annual Meeting of Stockholders , which will be filed with the Securities and Exchange Commission within 120 days after December 31 , 2020 , are incorporated by reference into Part III of this Annual Report on Form 10 - K .