Submission of Matters to a Vote of Security Holders - Form 8-K

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

On April 26, 2024, 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, provide that the role of Chief Executive Officer may be a separate office from the Chairman of the Board or the President and to clarify the role of the Chief Executive Officer, if a separate office.

The foregoing description is a summary and is qualified in its entirety by reference to the full text of the Amendment to the Bylaws, a copy of which is attached as Exhibit 3.2 hereto and is incorporated by reference herein.