# EDGAR Filing Document

**Accession Number:** 0000040211
**File Stem:** 0001104659-26-027380
**Filing Date:** 2026-3
**Character Count:** 6439
**Document Hash:** 576c305d8681cdb952ce4d2f3a39940f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-027380.hdr.sgml**: 20260313

**ACCESSION NUMBER**: 0001104659-26-027380

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260313

**DATE AS OF CHANGE**: 20260313

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GATX CORP
- **CENTRAL INDEX KEY:** 0000040211
- **STANDARD INDUSTRIAL CLASSIFICATION:** TRANSPORTATION SERVICES [4700]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 361124040
- **STATE OF INCORPORATION:** NY
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-02328
- **FILM NUMBER:** 26750192

**BUSINESS ADDRESS:**
- **STREET 1:** 233 SOUTH WACKER DRIVE
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606-7147
- **BUSINESS PHONE:** 3126216200

**MAIL ADDRESS:**
- **STREET 1:** 233 SOUTH WACKER DRIVE
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606-7147

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GENERAL AMERICAN TRANSPORTATION CORP
- **DATE OF NAME CHANGE:** 19750722

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

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**SCHEDULE 14A**

**Proxy Statement Pursuant to Section 14(a) of the**

**Securities Exchange Act of 1934**

**(Amendment No.)**

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Filed by the Registrant ☒&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to§240.14a-12

**GATX CORPORATION**

**(Name of Registrant as Specified In Its Charter)**

**(Name of Person(s) Filing Proxy Statement, if other than the Registrant)**

Payment of Filing Fee (Check the appropriate box):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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| &nbsp;&nbsp;![GRAPHIC](gatx-20260313xdefa14a_bg001.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Step 1: Go to www.envisionreports.com/GATX. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. www.envisionreports.com/GATX Online Go to www.envisionreports.com/GATX or scan the QR code — login details are located in the shaded bar below. 2026 Annual Meeting Notice 048OIB Important Notice Regarding the Availability of Proxy Materials for the GATX Corporation Shareholder Meeting to be Held on Friday, April 24, 2026 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the Annual Meeting of Shareholders are available on the Internet. Follow the instructions below to view the materials and vote online or request a printed copy of the proxy materials. The annual meeting will be held in a virtual meeting format only. The items to be voted on and the virtual meeting information are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The 2025 Annual Report to Shareholders and 2026 Notice of Annual Meeting and Proxy Statement are available at: Obtaining a copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before April 14, 2026, to facilitate timely delivery. 2NOT Easy Online Access — View your proxy materials and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. |

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| &nbsp;&nbsp;![GRAPHIC](gatx-20260313xdefa14a_bg002.jpg) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Here's how to request a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. — Internet – Go to www.envisionreports.com/GATX. Click Cast Your Vote or Request Materials. — Phone – Call us free of charge at 1-866-641-4276. — Email – Send an email to investorvote@computershare.com with "Proxy Materials GATX" in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, all requests for a paper copy of proxy materials must be received no later than April 14, 2026. The Annual Meeting of Shareholders of GATX Corporation will be held on April 24, 2026, virtually at meetnow.global/M5WAZJH at 9:00 a.m. Central Time. Proposals to be voted on at the meeting are listed below along with the Board of Directors' recommendations. The Board of Directors recommends a vote FOR all the nominees listed and FOR Proposals 2, 3 and 4: 1. ELECTION OF DIRECTORS: 01 - Diane M. Aigotti 02 - Anne L. Arvia 03 - Shelley J. Bausch 04 - John M. Holmes 05 - Robert C. Lyons 06 - James B. Ream 07 - Adam L. Stanley 08 - Robert S. Wetherbee 09 - Paul G. Yovovich 2. ADVISORY RESOLUTION TO APPROVE EXECUTIVE COMPENSATION 3. APPROVAL OF AN AMENDMENT AND RESTATEMENT OF THE 2012 INCENTIVE AWARD PLAN 4. RATIFICATION OF THE APPOINTMENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR FISCAL YEAR ENDING DECEMBER 31, 2026 PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Shareholder Meeting Notice |

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