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( Mark One ) 2020 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K 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 to Commission file number 1-16811 ( USS ) United States Steel Corporation For the transition period from Delaware ( State of Incorporation ) United States Steel Corporation ( Exact name of registrant as specified in its charter ) 25-1897152 Title of Each Class United States Steel Corporation Common Stock , par value $ 1.00 United States Steel Corporation Common Stock , par value $ 1.00 ( I.R.S. Employer Identification No. ) 600 Grant Street , Pittsburgh , PA 15219-2800 ( Address of principal executive offices ) Tel . No. ( 412 ) 433-1121 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol X X Name of Exchange on which Registered New York Stock Exchange Chicago Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark whether 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 at least 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 ( §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 emerging growth company . See the definition 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 . ☐ 0 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 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No Aggregate market value of Common Stock held by non - affiliates as of June 30 , 2020 ( the last business day of the registrant's most recently completed second fiscal quarter ) : $ 1.6 billion . The amount shown is based on the closing price of the registrant's Common Stock on the New York Stock Exchange composite tape on that date . Shares of Common Stock held by executive officers and directors of the registrant are not included in the computation . However , the registrant has made no determination that such individuals are “ affiliates ” within the meaning of Rule 405 under the Securities Act of 1933 . There were 262,471,855 shares of United States Steel Corporation Common Stock outstanding as of February 8 , 2021 . Documents Incorporated By Reference : Portions of the Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated into Part III .