Results of Operations · Reg FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549  __________________________  FORM 8-K   CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported): February 19, 2026 GATX Corporation (Exact name of registrant as specified in its charter) New York   1-2328   36-1124040 (State or other jurisdiction of incorporation)   (Commission File Number)   (IRS Employer Identification No.) 233 South Wacker Drive Chicago , Illinois 60606 -7147 (Address of principal executive offices, including zip code) ( 312 ) 621-6200 (Registrant’s telephone number, including area code)  __________________________ Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of Each Exchange on Which Registered Common Stock GATX New York Stock Exchange GATX NYSE Texas, Inc Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 2.02 Results of Operations and Financial Condition. Item 7.01 Regulation FD Disclosure. The following information is furnished pursuant to Item 2.02, "Results of Operations and Financial Condition" and Item 7.01, "Regulation FD Disclosure" and shall not be deemed "filed" for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. On February 19, 2026, GATX Corporation ("GATX") issued a press release that included unaudited financial statements and supplemental financial information for the quarter and year ended December 31, 2025. Additionally, GATX disclosed that on February 18, 2026 the board of directors declared a quarterly dividend of $0.66 per common share payable on March 31, 2026 to shareholders of record on March 2, 2026 and approved a new $300 million share repurchase authorization. A copy of the press release is attached hereto as Exhibit 99.1. GATX will host a teleconference to discuss its 2025 fourth-quarter and full-year results on February 19, 2026, beginning at 11 a.m. Eastern Time. Investors may access the conference by dialing 1-800-715-9871 (or 1-646-307-1963 if dialing from outside the United States). Item 9.01. Financial Statements and Exhibits.     (d) Exhibits Exhibit No.    Description 99.1    Press Release of GATX Corporation, dated February 19, 2026, reporting GATX Corporation's results for the quarter and year ended December 31, 2025. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.   GATX CORPORATION (Registrant) /s/ Thomas A. Ellman Thomas A. Ellman Executive Vice President and Chief Financial Officer February 19, 2026