Material Agreement, Financial Obligation (Form 8-K)

On June 30, 2025, GATX Corporation (the "Company") entered into a Commitment Increase Supplement (the "Supplement") among the Company, M&T Bank, as increasing lender (the "Increasing Lender"), PNC Bank, National Association, as issuing bank, U.S. Bank National Association, as issuing bank, and Citibank, N.A., as swing line bank and as administrative agent, to its existing Five Year Credit Agreement, dated as of May 21, 2024 (as amended, supplemented, or otherwise modified from time to time, the "Credit Agreement"), among the Company, Citibank, N.A. and BofA Securities, Inc., as joint lead arrangers and joint book managers, the lenders party thereto, and Citibank, N.A., as administrative agent. Pursuant to the Supplement, the Increasing Lender made a revolving credit commitment in an amount of $32 million to the Company. As a result of this increase, the aggregate revolving credit commitments of all lenders under the Credit Agreement increased from $600 million to $632 million.

The foregoing description of the Supplement is a summary and is qualified in its entirety by reference to the full text of the Supplement, which is attached as Exhibit 10.1 to this Current Report on Form 8-Kand is incorporated herein by reference.

The information provided in Item 1.01 of this Current Report on Form 8-Kis incorporated in this Item 2.03 by reference.