Form 10-Q Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934For the quarterly period ended March 31, 2026orTransition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934For the transition period fromtoCommission File Number: 1-7615 KIRBY CORPORATION (Exact name of registrant as specified in its charter) No Change(Former name, former address and former fiscal year, if changed since last report) Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file suchreports), and (2) has been subject to such filing requirements for the past 90 days. YesNo Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule 405 of Regulations S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period thatthe registrant was required to submit and post such files). YesNo Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smallerreporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smallerreporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. Accelerated filerSmaller reporting companyEmerging growth company Large accelerated filerNon-accelerated filer If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying 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 is a shell company (as defined in Rule 12b-2 of the Exchange Act). YesNo As of May 7, 2026, 53.5 million shares of the Registrant’s $0.10 par value per share common stock were outstanding. PART I – FINANCIAL INFORMATION KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIESCONDENSED STATEMENTS OF EARNINGS(Unaudited) KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIESCONDENSED STATEMENTS OF COMPREHENSIVE INCOME(Unaudited) KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIESCONDENSED STATEMENTS OF CASH FLOWS(Unaudited) KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIESCONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY(Unaudited) KIRBY CORPORATION AND CONSOLIDATED SUBSIDIARIESNOTES TO CONDENSED FINANCIAL STATEMENTS(Unaudited) (1)Basis for Preparation of the Condensed Financial Statements The condensed financial statements included herein have been prepared by Kirby Corporation and its consolidatedsubsidiaries (“Kirby” or the “Company”), without audit, pursuant to the rules and regulations of the Securities and ExchangeCommission. Although the Company believes that the disclosures are adequate to make the information presented not misleading,certain information and footnote disclosures, including significant accounting policies normally included in annual financialstatements, have been condensed or omitted pursuant to such rules and regulations. It is suggested that these condensed financialstatements be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.Certain reclassifications have been made to reflect the current presentation of financial information. (2)Acquisitions On March 17, 2026, the Company purchased 23 inland tank barges with a total capacity of 653,000 barrels, including fivespecialty barges, and three high horsepower towboats from an undisclosed seller for $95.8 million. The Company paid $81.4million in cash in March 2026 with the remaining $14.4 million to be paid in the 2026 second quarter when delivery of all vesselshas been completed. The 23 tank barges, including five specialty barges, transport petrochemicals and refined products on theMississippi River System and Gulf Intracoastal Waterway. The average age of the 23 barges was 19 years. On October 14, 2025, the Company purchased certain assets from an undisclosed seller in support of the KDS segment for$9.3 million in cash. The assets consisted of inventory and an authorized distributorship for EMD Power Products (“EMD”) forcertain geographic regions including Mexico, Central America, the northern part of South America and the Caribbean islands. On August 7, 2025, the Company purchased two inland tank barges and one towboat from an undisclosed seller for $9.2million in cash. On March 27, 2025, the Company purchased 14 inland tank barges with a total capacity of 364,000 barrels, including fourspecialty barges, and four high horsepower towboats from an undisclosed seller for $97.3 million in cash. The 14 tank barges,including four specialty barges, transport petrochemic