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Virginia 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 ( 0 ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to For the fiscal year ended December 31 , 2020 OR Title of each class Common Stock , $ 1 Par Value Commission File Number 1-8022 [ CSX ] CSX CORPORATION ( Exact name of registrant as specified in its charter ) 500 Water Street 15th Floor Jacksonville ( Address of principal executive offices ) 32202 ( Zip Code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) FL 62-1051971 ( I.R.S. Employer Identification No. ) 904 359-3200 ( Telephone number , including area code ) CSX 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 ( X ) 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 ( X ) 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 . Name of exchange on which registered Nasdaq Global Select Market Yes ( X ) 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 ( X ) 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 ( as defined in Exchange Act Rule 12b - 2 ) . Accelerated Filer ( ) Non - accelerated Filer ( ) Smaller reporting company ( + ) Large Accelerated Filer ( X ) Emerging growth company ( + ) Indicate by check mark whether the registrant is a shell company ( as defined in Exchange Act Rule 12b - 2 ) . Yes ( □ ) No ( X ) 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 ( + ) On June 30 , 2020 ( which is the last day of the second quarter and the required date to use ) , the aggregate market value of the Registrant's voting stock held by non - affiliates was approximately $ 53 billion ( based on the close price as reported on the NASDAQ National Market System on such date ) . CSX 2020 Form 10 - K p.1 There were 762,505,058 shares of Common Stock outstanding on January 31 , 2021 ( the latest practicable date that is closest to the filing date ) . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrant's Definitive Proxy Statement ( the " Proxy Statement ” ) to be filed no later than 120 days after the end of the fiscal year with respect to its 2020 annual meeting of shareholders .