SCHEDULE 13D/A 0000807249-06-000225 0000807249 XXXXXXXX LIVE 13 Common Stock 01/15/2025 false 0000040211 361448103 GATX CORP

233 SOUTH WACKER DRIVE 233 SOUTH WACKER DRIVE CHICAGO IL 60606-7147

DAVID GOLDMAN 9149217793 GAMCO INVESTORS, INC. ONE CORPORATE CENTER RYE NY 10580 0000807249 N GAMCO INVESTORS, INC. ET AL WC N NY 0.00 0.00 0.00 0.00 0.00 Y 0.0 CO HC 0001081407 N GABELLI FUNDS LLC OO N NY 1004050.00 0.00 1004050.00 0.00 1004050.00 N 2.8 CO IA 0001460612 N GAMCO Asset Management Inc. OO N NY 1273165.00 0.00 1321365.00 0.00 1321365.00 N 3.7 IA CO Y MJG ASSOCIATES, INC. OO N CT 4200.00 0.00 4200.00 0.00 4200.00 N 0.0 CO 0001238894 N GGCP, INC. WC N WY 0.00 0.00 0.00 0.00 0.00 Y 0.0 CO HC 0001642122 N Associated Capital Group, Inc. WC N DE 0.00 0.00 0.00 0.00 0.00 Y 0.0 CO HC 0001185533 N GABELLI MARIO J PF N X1 0.00 0.00 0.00 0.00 0.00 Y 0.0 IN Common Stock GATX CORP 233 SOUTH WACKER DRIVE 233 SOUTH WACKER DRIVE CHICAGO IL 60606-7147 This statement is being filed by one or more of the following persons: GGCP, Inc. (GGCP), GGCP Holdings LLC (GGCP Holdings), GAMCO Investors, Inc. (GBL), Associated Capital Group, Inc. (AC), Gabelli Funds, LLC (Gabelli Funds), GAMCO Asset Management Inc. (GAMCO), Teton Advisors, LLC (Teton Advisors), Keeley-Teton Advisors, LLC (Keeley-Teton), Gabelli & Company Investment Advisers, Inc. (GCIA), Morgan Group Holding Co., (MGH), G.research, LLC (G.research), MJG Associates, Inc. (MJG Associates), Gabelli Securities International (Bermuda) Limited (GSIL), Gabelli Foundation, Inc. (Foundation), Mario Gabelli, LICT and CIBL. Those of the foregoing persons signing this Schedule 13D are hereinafter referred to as the Reporting Persons. GAMCO is a New York corporation and GBL and MGH are Delaware corporations, each having its principal business office at One Corporate Center, Rye, New York 10580. GGCP is a Wyoming corporation and AC and GCIA are Delaware corporations each having its principal business office 191 Mason Street, Greenwich, CT 06830. GGCP Holdings is a Delaware limited liability corporation having its principal business office at 191 Mason Street, Greenwich, CT 06830. G.research is a Delaware limited liability company having its principal officers at One Corporate Center, Rye, New York 10580. Gabelli Funds is a New York limited liability company having its principal business office at One Corporate Center, Rye, New York 10580. Teton Advisors is a Delaware limited liability company having its principal place of business at 189 Mason Street, Greenwich, CT 06830. Keeley-Teton Advisors is a Delaware limited liability company having its principal place of business at 141 W. Jackson Blvd., Chicago, IL 60604. MJG Associates is a Connecticut corporation having its principal business office at 191 Mason Street, Greenwich, CT 06830. The Foundation is a Nevada corporation having its principal offices at 165 West Liberty Street, Reno, Nevada 89501. LICT is a Delaware corporation having its principal place of business as 401 Theodore Fremd Avenue, Rye, New York 10580. CIBL, Inc. is a Delaware corporation having its principal place of business as 165 West Liberty Street, Suite 220, Reno, NV 89501. Not applicable. Not applicable. United States Item 5 to Schedule 13D is amended, in pertinent part, as follows: The aggregate number of Securities to which this Schedule 13D relates is 2,329,615 shares, representing 6.56% of the 35,500,000 shares outstanding as reported by the Issuer in its most recently filed Form 10-Q for the quarterly period ended September 30, 2024. The Reporting Persons beneficially own those Securities as follows: Funds 1,004,050 shares 2.83%, GAMCO 1,321,365 shares 3.72% and MJG Associates 4,200 shares 0.01% Each of the Reporting Persons and Covered Persons has the sole power to vote or direct the vote and sole power to dispose or to direct the disposition of the Securities reported for it, either for its own benefit or for the benefit of its investment clients or its partners, as the case may be, except that (i) GAMCO does not have authority to vote 48,200 of the reported shares, (ii) Gabelli Funds has sole dispositive and voting power with respect to the shares of the Issuer held by the Funds so long as the aggregate voting interest of all joint filers does not exceed 25% of their total voting interest in the Issuer and, in that event, the Proxy Voting Committee of each Fund shall respectively vote that Funds shares, (iii) at any time, the Proxy Voting Committee of each such Fund may take and exercise in its sole discretion the entire voting power with respect to the shares held by such fund under special circumstances such as regulatory considerations, and (iv) the power of Mario Gabelli, AC, GBL, and GGCP is indirect with respect to Securities beneficially owned directly by other Reporting Persons. Information with respect to all transactions in the Securities which were effected during the past sixty days or since the most recent filing on Schedule 13D, whichever is less, by each of the Reporting Persons and Covered Persons is set forth below: DATE SHARES PURCHASED PRICE /SOLD GABELLI FUNDS, LLC GAMCO ACV SICAV 12/2/2024 -150 165.5833 GABELLI ASSET FUND 12/5/2024 -1,000 160.0920 11/22/2024 -1,500 161.5000 11/21/2024 -1,500 159.2524 GABELLI CAPITAL ASSET FUND 11/21/2024 -300 159.4250 GABELLI EQUITY INCOME FUND 1/8/2025 -500 150.9740 1/3/2025 -1,000 153.6500 GABELLI EQUITY TRUST 12/24/2024 -500 155.6366 12/20/2024 -300 155.4600 GABELLI UTILITIES FUND 1/15/2025 -1,000 153.8160 1/13/2025 -600 150.0450 12/24/2024 -500 155.1796 12/23/2024 -500 155.0000 12/19/2024 -1,000 158.1000 12/17/2024 -500 161.8320 12/10/2024 -500 162.6500 12/9/2024 -1,000 162.0318 12/4/2024 -1,100 161.0095 11/27/2024 -300 164.0000 11/25/2024 -600 162.9250 11/21/2024 -1,000 159.3887 GAMCO ASSET MANAGEMENT INC. 1/15/2025 -50 156.4800 1/7/2025 -150 152.6900 1/2/2025 -100 156.9010 12/30/2024 -150 154.0000 12/26/2024 -800 156.6935 12/26/2024 -100 157.4600 12/24/2024 -500 156.2001 12/23/2024 -100 154.4802 12/20/2024 -400 156.6287 12/19/2024 -250 158.1000 12/18/2024 -100 162.3500 12/16/2024 -800 161.0325 12/16/2024 -1,600 161.6834 12/16/2024 -100 161.7700 12/13/2024 -500 161.0436 12/12/2024 -500 162.5000 12/12/2024 -600 163.1624 12/11/2024 -295 166.9593 12/11/2024 -25 167.0574 12/10/2024 -2,145 164.5453 12/9/2024 -300 161.4200 12/6/2024 -500 160.3600 12/6/2024 -400 160.8050 12/3/2024 -1,500 164.0040 12/2/2024 -1,500 164.3333 11/27/2024 -450 163.6444 11/26/2024 -50 162.8700 11/26/2024 -100 163.6100 11/26/2024 -500 164.0840 11/25/2024 -400 166.4550 11/22/2024 -300 160.1735 11/21/2024 -800 157.3625 11/21/2024 -200 159.3122 11/19/2024 -700 150.7307 11/19/2024 125 151.0990 11/18/2024 -1,200 152.7708 11/15/2024 -800 151.2983 The investment advisory clients of, or partnerships managed by, GAMCO, Gabelli Funds, Teton Advisors and MJG Associates have the sole right to receive and, subject to the notice, withdrawal and/or termination provisions of such advisory contracts and partnership arrangements, the sole power to direct the receipt of dividends from, and the proceeds of sale of, any of the Securities beneficially owned by such Reporting Persons on behalf of such clients or partnerships. Except as noted, no such client or partnership has an interest by virtue of such relationship that relates to more than 5% of the Securities. Not applicable. GAMCO INVESTORS, INC. ET AL PETER D. GOLDSTEIN 01/16/2025 GABELLI FUNDS LLC DAVID GOLDMAN 01/16/2025 GAMCO Asset Management Inc. DOUGLAS R. JAMIESON 01/16/2025 MJG ASSOCIATES, INC. DAVID GOLDMAN 01/16/2025 GGCP, INC. DAVID GOLDMAN 01/16/2025 Associated Capital Group, Inc. DOUGLAS R. JAMIESON 01/16/2025 GABELLI MARIO J DAVID GOLDMAN 01/16/2025