Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On October 25, 2022, the Board of Directors (the "Board") of Kirby Corporation (the "Company") amended the bylaws of the Company (as amended or modified from time to time, the "Bylaws"), which became effective on that date, in order to, among other things:

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Address recently adopted amendments to Rule 14a-19 under the Securities Exchange Act of 1934, as amended, by requiring that any person soliciting proxies in support of a director nominee other than the Board's nominees provide a representation that such person will comply with Rule 14a-19 and deliver reasonable evidence to the Company that the Rule 14a-19 requirements have been met; and

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Clarify the Company's ability to conduct meetings by means of remote communication and the Board's authority to designate the location for stockholder meetings.

The Bylaws also incorporate various other updates and technical, clarifying and conforming changes.

The foregoing description is a summary and is qualified in its entirety by reference to the full text of the Bylaws, a copy of which is attached as Exhibit 3.1 hereto and is incorporated by reference herein.

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