Results of Operations and Financial Condition. On July 29, 2026, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the second quarter ended June 30, 2026. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically ev…

Results of Operations and Financial Condition. On April 30, 2026, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the first quarter ended March 31, 2026. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically e…

The filing pertains to the approval of amendments to a stock plan for nonemployee directors, which is not a management change.

Creation of a Direct Financial Obligation or an Obligation Under an Off-Balance Sheet Arrangement of a Registrant. On March 26, 2026, Kirby borrowed $200 million under the revolving credit facility described in

Entry into a Material Definitive Agreement. On March 26, 2026, Kirby Corporation (“Kirby”) entered into an amended and restated credit agreement (the “2031 Credit Agreement”) with JPMorgan Chase Bank, N.A. (“JPMorgan”), as administrative agent, and certain lenders and issuing banks party thereto. The 2031 Credit Agreement amends and restates in its entirety Kirby’s existing credit agreement, dated as of July 29, 2022 (the “2027 Credit Agreement”), extending the term of the facility to March 2…

Director — Tracy A. Embree: The Board of Directors expanded the size and elected Tracy A. Embree as a new independent director.

Results of Operations and Financial Condition. On January 29, 2026, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the fourth quarter ended December 31, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. Adjusted EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines Adjusted EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, depreciation and amortization, and…

Results of Operations and Financial Condition. On October 29, 2025, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the third quarter ended September 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historic…

Other Events. On September 8, 2025, the Board of Directors of Kirby Corporation (the “Company”) authorized the repurchase of up to an additional 8,000,000 shares of the Company’s common stock under the Company’s existing share repurchase authorization (the “Repurchase Authorization”). As of September 5, 2025, 4,151,058 shares had been purchased under the Repurchase Authorization and with the new authorization, 8,848,942 shares remained authorized for repurchase. Purchases under the Repurchase…

Results of Operations and Financial Condition. On July 31, 2025, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the second quarter ended June 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically ev…

Results of Operations and Financial Condition. On May 1, 2025, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the first quarter ended March 31, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically eval…

Results of Operations and Financial Condition. On January 30, 2025, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the fourth quarter ended December 31, 2024. A copy of the press release is attached as Exhibit 99.1 to this report. Adjusted EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines Adjusted EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, depreciation and amortization, and…

Results of Operations and Financial Condition. On October 30, 2024, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the third quarter ended September 30, 2024. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historic…

EVP, General Counsel and Secretary — Amy D. Husted: The filing discloses the internal promotion of a long-tenured employee to Executive Vice President, General Counsel, and Secretary, accompanied by a compensatory equity grant.

Results of Operations and Financial Condition. On August 1, 2024, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the second quarter ended June 30, 2024. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically e…

Chief Executive Officer — David W. Grzebinski: David W. Grzebinski was promoted to CEO while Christian G. O'Neil was appointed President and COO, representing an internal succession rather than a departure.

President and Chief Operating Officer — Christian G. O’Neil: The filing discloses the internal promotion of a long-tenured segment president to the role of President and Chief Operating Officer, which is a succession event rather than a departure.

Results of Operations and Financial Condition. On April 25, 2024, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the first quarter ended March 31, 2024. A copy of the press release is attached as Exhibit 99.1 to this report. EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically e…