Page 1

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) X ANNUAL REPORT PURSUANT TO SECTION 13 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 Commission File Number 001-35243 SUNCOKE ENERGY , INC . ( Exact name of Registrant as specified in its charter ) Delaware ( State of or other jurisdiction of incorporation or organization ) 1011 Warrenville Road , Suite 600 Lisle , Illinois 60532 ( Registrant's Securities registered pursuant to section 12 ( b ) of the Act : Title of Each Class Common Stock , $ 0.01 par value ( 630 ) 824-1000 telephone number , including area code ) 90-0640593 ( I.R.S. Employer Identification No. ) Trading symbol ( s ) SXC Securities registered pursuant to Section 12 ( g ) of the Act : None Name of Each Exchange on which Registered New York Stock Exchange No ý No ý Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . Yes 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 ý 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ý 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 Non - accelerated filer 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 . Yes No ý No ý Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes The aggregate market value of the registrant's common stock on June 30 , 2020 ( based upon the closing price of $ 2.96 on June 30 , 2020 , the last trading day of the registrant's most recently completed second fiscal quarter , on the New York Stock Exchange ) held by non - affiliates was approximately $ 243,652,539 . The number of shares of common stock outstanding as of February 19 , 2021 was 82,806,106 . Portions of the SunCoke Energy , Inc. 2021 definitive Proxy Statement , which will be filed with the Securities and Exchange Commission within 120 days after December 31 , 2020 , are incorporated by reference in Part III of this Form 10 - K .