GATX公司2025年报告

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2025 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from ________ to ________ Commission file number 1-2328_____________________ A. Full title of the plan and the address of the plan, if different from that of the issuer named below: GATX Corporation Hourly Employees Retirement Savings Plan B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: GATX Corporation233 South Wacker DriveChicago, Illinois 60606-7147 INDEX Report of Independent Registered Public Accounting Firm To the Plan Participants and the Plan Administrator of GATX Corporation Hourly Employees Retirement Savings Plan Opinion on the Financial Statements We have audited the accompanying statements of net assets available for benefits of GATX Corporation Hourly Employees RetirementSavings Plan (the Plan) as of December 31, 2025 and 2024, and the related statements of changes in net assets available for benefitsfor the years then ended, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financialstatements present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2025 and 2024, and Basis for Opinion These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’sfinancial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting OversightBoard (United States) (PCAOB) and are required to be independent with respect to the Plan in accordance with the U.S. federalsecurities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the auditto obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part ofour audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressingan opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due toerror or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidenceregarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles usedand significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe Supplemental Schedule Required by ERISA The accompanying supplemental schedule of assets (held at end of year) as of December 31, 2025 (referred to as the “supplementalschedule”), has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. Theinformation in the supplemental schedule is the responsibility of the Plan’s management. Our audit procedures included determiningwhether the information reconciles to the financial statements or the underlying accounting and other records, as applicable, andperforming procedures to test the completeness and accuracy of the information presented in the supplemental schedule. In forming /s/ Ernst & Young LLP We have served as the Plan’s auditor since at least 1999, but we are unable to determine the specific year.Chicago, IllinoisJune 26, 2026 AssetsPlan interest in the GATX Corporation Master Trust GATX Corporation Hourly Employees Retirement Savings PlanNotes to Financial Statements 1. Description of the Plan The following description of the GATX Corporation (GATX or the Company) Hourly Employees Retirement Savings Plan (the Plan)provides only general information. Participants should refer to the Plan document for a more complete description of the Plan'sprovisions. General The Plan is a defined-contribution plan, established January1, 1994, for hourly union employees of GATX who have completed atleast 520 hours of service. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended(ERISA). Fidelity Management Trust Company has been appointed trustee of the Plan and also serves as the record keeper to maintain Effective January 1, 2025, the Plan was amended and restated to comply with certain provisions under the Sett