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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( Mark One ) 冈 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 Form 10 - K □ No | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Title of each class Common Stock or Nevada ( State or other jurisdiction of incorporation or organization ) 55 Waugh Drive , Suite 1000 Houston , Texas ( Address of principal executive offices ) Commission File no . 1-07615 Kirby Corporation ( Exact name of registrant as specified in its charter ) 74-1884980 ( I.R.S. Employer Identification No. ) 77007 ( Zip Code ) Registrant's telephone number , including area code : ( 713 ) 435-1000 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) KEX Name of each exchange on which registered 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 15 ( d ) of the Exchange 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 No