GATX / GATX Corporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

GATX Corporation
US ˙ NYSE ˙ US3614481030

Mga Batayang Estadistika
LEI 549300IHYHCQP2PIR591
CIK 40211
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to GATX Corporation
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
July 29, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 29, 2025 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

July 29, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified in

July 29, 2025 EX-99.1

Tuesday, July 29, 2025 11 a.m. Eastern Time Domestic Dial-In: 1-800-715-9871 International Dial-In: 1-646-307-1963 Replay: 1-800-770-2030 (Domestic) or 1-609-800-9909 (International) / Access Code: 4187876

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2025 SECOND-QUARTER RESULTS •Company raises 2025 full-year earnings guidance to $8.50–$8.90 per diluted share •Rail North America’s fleet utilization remains above 99% •Demand for aircraft spare engines remains robust •Investment volume was $219.0 million in the second quarter and totaled $515.3 million year to date CHICAGO,

July 14, 2025 EX-99.1

FOR IMMEDIATE RELEASE GATX CORPORATION ADDS ROBERT S. WETHERBEE TO BOARD OF DIRECTORS CHICAGO, July 14, 2025 ‒ GATX Corporation (NYSE: GATX) today announced the election of Robert “Bob” S. Wetherbee to its board of directors. Mr. Wetherbee will also

a07142025wetherbeeannoun FOR IMMEDIATE RELEASE GATX CORPORATION ADDS ROBERT S. WETHERBEE TO BOARD OF DIRECTORS CHICAGO, July 14, 2025 ‒ GATX Corporation (NYSE: GATX) today announced the election of Robert “Bob” S. Wetherbee to its board of directors. Mr. Wetherbee will also serve as a member of the board’s Audit and Compensation Committees. With the appointment of Mr. Wetherbee, the GATX board wil

July 14, 2025 8-K

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): July 13, 2025 GATX Corporation (E

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): July 13, 2025 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

July 1, 2025 EX-10.1

Commitment Increase Supplement, dated as of June 30, 2025, by and among GATX Corporation, M&T Bank as Increasing Lender, the additional parties thereto and Citibank, N.A., as Administrative Agent.

EX-10.1 Exhibit 10.1 EXECUTION VERSION COMMITMENT INCREASE SUPPLEMENT June 30, 2025 Citibank, N.A., as Administrative Agent for the Lenders referred to below One Penns Way, Building Ops II New Castle, Delaware 19720 Attention: Agency Operations Ladies and Gentlemen: The undersigned, GATX corporation, a New York corporation (“we” or the “Company”), refers to the Five Year Credit Agreement, dated as

July 1, 2025 8-K

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): June 30, 2025 GATX Corporation (E

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): June 30, 2025 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

June 25, 2025 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2024 [ ] TRANSITION REPORT PURSUANT TO SECTION

UNITED STATES 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 1934 For the fiscal year ended December 31, 2024 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 25, 2025 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2024 [ ] TRANSITION REPORT PURSUANT TO SECTION

UNITED STATES 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 1934 For the fiscal year ended December 31, 2024 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

May 30, 2025 EX-10.1

Purchase Agreement, dated as of May 29, 2025, by and among GATX Corporation, Wells Fargo Bank, N.A., Everen Capital Corporation, BFLX Leasing Holdings LLC, GATX Rail Locomotive Group, L.L.C. and GABX Leasing LLC.

Exhibit 10.1 EXECUTION VERSION PURCHASE AGREEMENT BY AND AMONG WELLS FARGO BANK, N.A., EVEREN CAPITAL CORPORATION, BFLX LEASING HOLDINGS LLC, GATX RAIL LOCOMOTIVE GROUP, L.L.C., GATX CORPORATION (SOLELY FOR PURPOSES OF ARTICLE V, SECTIONS 6.5, 6.6, 6.7, 6.9(a), 6.10, 6.17, 6.18, 6.21, 8.2, AND ARTICLES X AND XI) AND GABX LEASING LLC, DATED AS OF MAY 29, 2025 TABLE OF CONTENTS Page ARTICLE I CERTAI

May 30, 2025 8-K

Regulation 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): May 29, 2025 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)

May 30, 2025 EX-99.1

GATX CORPORATION AND BROOKFIELD INFRASTRUCTURE TO ACQUIRE WELLS FARGO’S RAIL ASSETS

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE GATX CORPORATION AND BROOKFIELD INFRASTRUCTURE TO ACQUIRE WELLS FARGO’S RAIL ASSETS • GATX and Brookfield Infrastructure form a joint venture and enter into an agreement to acquire Wells Fargo’s rail operating lease portfolio, composed of approximately 105,000 railcars • Additionally, Brookfield Infrastructure enters into an agreement to directly acquire

May 30, 2025 EX-10.3

Form of Amended and Restated Limited Liability Company Agreement.

Exhibit 10.3 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF GABX LEASING LLC TABLE OF CONTENTS Page ARTICLE I GENERAL MATTERS 2 Section 1.1 Formation 2 Section 1.2 Name 2 Section 1.3 Purpose 2 Section 1.4 Registered Office 2 Section 1.5 Registered Agent 2 Section 1.6 Members 2 Section 1.7 Powers 3 Section 1.8 Limited Liability Company Agreement 3 Section 1.9 Issuance of Additional Mem

May 30, 2025 EX-10.2

Investors Agreement, dated as of May 29, 2025, by and among GATX Corporation, GABX Leasing LLC, GABX Leasing Holding LLC, Brookfield Infrastructure Fund V-A, L.P., Brookfield Infrastructure Fund V-B, L.P., Brookfield Infrastructure Fund V-C, L.P. and Brookfield Infrastructure Fund V (ER) SCSP L.P.

Exhibit 10.2 EXECUTION VERSION INVESTORS AGREEMENT This INVESTORS AGREEMENT (together with the Exhibits hereto, as amended, restated, supplemented or otherwise modified from time to time in compliance with the terms hereof, this “Agreement”), dated as of May 29, 2025, is entered into by and among (i) GABX Leasing LLC, a Delaware limited liability company (“JV”), (ii) GABX Leasing Holding LLC, a De

April 30, 2025 8-K

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): April 25, 2025 GATX Corporation (

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): April 25, 2025 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 Numbe

April 25, 2025 EX-10.1

Amendment to Amended and Restated Agreement for Employment Following a Change of Control, dated February 18, 2025, between GATX Corporation and Robert C. Lyons.*

exhibit101amendmentxtox US-DOCS\157230907.1 AMENDMENT TO AMENDED AND RESTATED AGREEMENT FOR EMPLOYMENT FOLLOWING A CHANGE IN CONTROL This Amendment to the Amended and Restated Agreement for Employment Following a Change in Control dated as of January 1, 2009 , by and between GATX Corporation, a New York ), and Robert C. Lyons is made and entered into effective as of February 18, 2025 (the Amendmen

April 25, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified i

April 23, 2025 EX-99.1

Wednesday, April 23, 2025 11 a.m. Eastern Time Domestic Dial-In: 1-800-715-9871 International Dial-In: 1-646-307-1963 Replay: 1-800-770-2030 (Domestic) or 1-609-800-9909 (International) / Access Code: 4187876

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2025 FIRST-QUARTER RESULTS ◦2025 first-quarter net income was $78.6 million, or $2.15 per diluted share ◦Rail North America’s fleet utilization remained high at 99.2%; Lease Price Index (LPI) at 24.5% ◦First-quarter investment volume was approximately $300 million ◦Company reiterates 2025 full-year earnings guidance CHICAGO,

April 23, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): April 23, 2025 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 Numbe

April 8, 2025 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3ASR (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security  Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum  Offering Price Per Unit Maximum  Aggregate Offering Price Fee Rate  Amount of Regis

April 8, 2025 S-3ASR

As filed with the Securities and Exchange Commission on April 8, 2025

S-3ASR Table of Contents As filed with the Securities and Exchange Commission on April 8, 2025 Registration No.

April 8, 2025 EX-25.1

Form T-1, Statement of Eligibility of the Debt Trustee for the Indenture.

EX-25.1 Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036

April 8, 2025 EX-25.2

Form T-1, Statement of Eligibility of the Debt Trustee for the Subordinated Indenture.

EX-25.2 Exhibit 25.2 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036

March 14, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ 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)) ☐ Defin

March 14, 2025 DEF 14A

r UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents r UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 19, 2025 EX-10.1

Summary of Non-Employee Directors' Compensation.*

NON-EMPLOYEE DIRECTOR COMPENSATION The Compensation Committee, with assistance from Pay Governance, reviews and makes recommendations to the Board regarding the form and amount of compensation for non- -employee director compensation program is designed to enable continued attraction and retention of highly qualified directors and to address the time, effort, expertise, and accountability required of active Board membership.

February 19, 2025 EX-10.2

Amended and Restated GATX Corporation Directors' Voluntary Deferred Fee Plan, effective as of January 1, 2025.*

US-DOCS\154286154.4 GATX CORPORATION VOLUNTARY DEFERRED FEE PLAN AMENDED AND RESTATED AS OF JANUARY 1, 2025 Section 1. PURPOSE AND EFFECTIVE DATE. is to provide to non- defer such Board RSUs (each as defined below). This amended and restated Plan is . Section 2. DEFINITIONS. Unless the context otherwise requires, the following words as used herein shall have the following meanings: (a) Accounts. C

February 19, 2025 EX-21

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT The following is a list of subsidiaries included in our consolidated financial statements and the state or country of incorporation of each: Company Name State or Country of Incorporation GATX Terminals Overseas Holding Corporation (1) Delaware GATX Global Finance B.

February 19, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SEC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934Commission File Number 1-2328 GATX Corporation (Exact name of registrant as specified in its ch

February 19, 2025 EX-19

GATX Corporation Insider Trading Policy.

Insider Trading Policy Page -1- Exhibit 19 GATX CORPORATION INSIDER TRADING POLICY Effective: October 25, 2024 Purpose Federal laws and regulations prohibit trading in the securities of a company while in possession of material nonpublic information and in breach of a duty of trust or confidence.

February 6, 2025 EX-1.1

Underwriting Agreement, dated February 4, 2025, between GATX and BofA Securities, Inc., Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 $800,000,000 GATX CORPORATION 5.500% SENIOR NOTES DUE 2035 6.050% SENIOR NOTES DUE 2054 UNDERWRITING AGREEMENT February 4, 2025 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I her

February 6, 2025 EX-4.1

Form of 5.500% Senior Notes due 2035.

Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

February 6, 2025 8-K

Entry into a Material Definitive Agreement

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 4, 2025 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 Num

February 6, 2025 EX-4.2

Form of 6.050% Senior Notes due 2054.

Exhibit 4.2 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

February 5, 2025 EX-FILING FEES

Calculation of Filing Fee Table 424(b)(5) 1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5) 1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 5.

February 5, 2025 FWP

GATX Corporation PRICING TERM SHEET February 4, 2025 Issuer: GATX Corporation Pricing Date: February 4, 2025 Expected Settlement Date*: February 6, 2025 (T+2) Expected Ratings**: Moody’s: Baa2 (Positive) / S&P: BBB (Stable) / Fitch: BBB+ (Stable) Sec

Pursuant to Rule 433 Registration No. 333-264721 February 4, 2025 GATX Corporation PRICING TERM SHEET February 4, 2025 Issuer: GATX Corporation Pricing Date: February 4, 2025 Expected Settlement Date*: February 6, 2025 (T+2) Expected Ratings**: Moody’s: Baa2 (Positive) / S&P: BBB (Stable) / Fitch: BBB+ (Stable) Security: 5.500% Senior Notes due 2035 (the “2035 Notes”) 6.050% Senior Notes due 2054

February 5, 2025 424B5

$800,000,000 GATX Corporation $500,000,000 5.500% Senior Notes due 2035 $300,000,000 6.050% Senior Notes due 2054

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement February 4, 2025 (To Prospectus dated May 5, 2022) $800,000,000 GATX Corporation $500,000,000 5.500% Senior Notes due 2035 $300,000,000 6.050% Senior Notes due 2054 We are offering for sale $500,000,000 aggregate principal amount of 5.500% senior notes due 2035 (the “2035 notes”), and an additional

February 4, 2025 424B3

SUBJECT TO COMPLETION, DATED FEBRUARY 4, 2025

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-264721 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not pe

January 23, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 23, 2025 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 Num

January 23, 2025 EX-99.1

Thursday, Jan. 23, 2025 11 a.m. Eastern Time Domestic Dial-In: 1-800-715-9871 International Dial-In: 1-646-307-1963 Replay: 1-800-770-2030 (Domestic) or 1-609-800-9909 (International) / Access Code: 7785277

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2024 FOURTH-QUARTER AND FULL-YEAR RESULTS •Fourth-quarter 2024 net income was $76.5 million or $2.10 per diluted share; full-year 2024 net income was $284.2 million or $7.78 per diluted share •Rail North America’s fleet utilization remained above 99%; Lease Price Index (LPI) at 26.7% •Full-year investment volume exceeded $1.6

October 24, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specifi

October 22, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 22, 2024 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 Num

October 22, 2024 EX-99.1

Tuesday, Oct. 22, 2024 11 a.m. Eastern Time Domestic Dial-In: 1-800-715-9871 International Dial-In: 1-646-307-1963 Replay: 1-800-770-2030 or 1-609-800-9909 / Access Code: 5389470

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2024 THIRD-QUARTER RESULTS •Demand for railcars across GATX's global fleets remains strong; Rail North America’s fleet utilization remains above 99% •Aircraft spare engine portfolio continues strong performance •Investment volume was $504.5 million in the third quarter and totaled over $1.3 billion year to date •Company updat

July 25, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified in

July 23, 2024 EX-99.1

Tuesday, July 23, 2024 11 a.m. Eastern Time Domestic Dial-In: 1-800-715-9871 International Dial-In: 1-646-307-1963 Replay: 1-800-770-2030 or 1-609-800-9909 / Access Code: 1721810

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2024 SECOND-QUARTER RESULTS •Demand for railcars remains robust across all regions; Rail North America’s fleet utilization remains above 99% •Aircraft spare engine portfolio continues to benefit from strong demand for global air travel •Investment volume was $442.0 million in the second quarter and totaled $820.6 million year

July 23, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 23, 2024 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

June 27, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2023 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 27, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2023 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 5, 2024 EX-1.1

Underwriting Agreement, dated June 3, 2024, between GATX and BofA Securities, Inc. and Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 $600,000,000 GATX CORPORATION 6.050% SENIOR NOTES DUE 2034 6.050% SENIOR NOTES DUE 2054 UNDERWRITING AGREEMENT June 3, 2024 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I hereto

June 5, 2024 EX-4.1

Form of 6.050% Senior Notes due 2034.

Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

June 5, 2024 EX-4.2

Form of 6.050% Senior Notes due 2054.

Exhibit 4.2 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

June 5, 2024 8-K

Entry into a Material Definitive Agreement

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): June 3, 2024 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)

June 4, 2024 424B5

$600,000,000 GATX Corporation $200,000,000 6.050% Senior Notes due 2034 $400,000,000 6.050% Senior Notes due 2054

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement June 3, 2024 (To Prospectus dated June 3, 2024) $600,000,000 GATX Corporation $200,000,000 6.050% Senior Notes due 2034 $400,000,000 6.050% Senior Notes due 2054 We are offering for sale an additional $200,000,000 aggregate principal amount of 6.050% senior notes due 2034 (the “new 2034 notes”), an

June 4, 2024 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Propos

Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 6.

June 3, 2024 FWP

GATX Corporation PRICING TERM SHEET June 3, 2024 Issuer: GATX Corporation Pricing Date: June 3, 2024 Expected Settlement Date*: June 5, 2024 (T+2) Expected Ratings**: Moody’s: Baa2 (Positive) / S&P: BBB (Stable) / Fitch: BBB+ (Stable) Security: 6.050

Pursuant to Rule 433 Registration No. 333-264721 June 3, 2024 GATX Corporation PRICING TERM SHEET June 3, 2024 Issuer: GATX Corporation Pricing Date: June 3, 2024 Expected Settlement Date*: June 5, 2024 (T+2) Expected Ratings**: Moody’s: Baa2 (Positive) / S&P: BBB (Stable) / Fitch: BBB+ (Stable) Security: 6.050% Senior Notes due 2034 (the “2034 Notes”) 6.050% Senior Notes due 2054 (the “2054 Notes

June 3, 2024 424B3

SUBJECT TO COMPLETION, DATED JUNE 3, 2024

Table of Contents The information in this preliminary prospectus supplement is not complete and may be changed.

May 22, 2024 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): May 21, 2024 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)

May 22, 2024 EX-10.1

Five Year Credit Agreement dated as of May 21, 2024, among GATX Corporation, as borrower, Citibank, N.A. and BofA Securities, Inc., as joint lead arrangers and joint book managers, Bank of America, N.A., as syndication agent, BMO Bank N.A., CIBC Bank USA, KeyBank National Association, Morgan Stanley MUFG Loan Partners, LLC, PNC Bank, National Association and U.S. Bank, National Association, as co-documentation agents, Citibank, N.A., as administrative agent, and the lenders party thereto.

Exhibit 10.1 EXECUTION VERSION FIVE YEAR CREDIT AGREEMENT Dated as of May 21, 2024 Among GATX CORPORATION as Borrower and THE INITIAL LENDERS NAMED HEREIN as Initial Lenders and CITIBANK, N.A. as Administrative Agent and CITIBANK, N.A. and BOFA SECURITIES, INC. as Joint Lead Arrangers and Joint Book Managers and BANK OF AMERICA, N.A. as Syndication Agent and BMO BANK N.A. CIBC BANK USA KEYBANK NAT

April 30, 2024 8-K

Submission of Matters to a Vote of Security Holders

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): April 26, 2024 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 Numbe

April 26, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified i

April 26, 2024 EX-10.2

Form of Non-Qualified Stock Option Agreement for awards under the GATX Corporation 2012 Incentive Award Plan to executive officers.*

GATX CORPORATION 2012 INCENTIVE AWARD PLAN OPTION AGREEMENT GATX Corporation (the "Company") hereby grants on the Grant Date to the Participant as an incentive to advance the interests of the Company an option (the "Option") to purchase the number of Shares set forth on the Shareworks website (https://www.

April 26, 2024 EX-10.3

Form of Corporate Officers' Incentive Plan under the GATX Corporation 2012 Incentive Award Plan.*

Page 1 GATX CORPORATION CORPORATE OFFICERS’ INCENTIVE PLAN (COIP) Effective: January 1, 2024 1.

April 26, 2024 EX-10.1

Form of Performance Share Agreement for grants under the GATX Corporation Amended and Restated 2012 Incentive Award Plan to executive officers.*

1 GATX CORPORATION 2012 INCENTIVE AWARD PLAN PERFORMANCE SHARE AGREEMENT FOR EXECUTIVE OFFICERS GATX Corporation (the "Company") hereby grants on the Grant Date to the Participant as an incentive to advance the interests of the Company the number of Performance Shares approved by the Administrator, subject to Section 3.

April 23, 2024 EX-99.1

Tuesday, April 23, 2024 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 or 1-647-362-9199 / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2024 FIRST-QUARTER RESULTS •2024 first-quarter net income was $74.3 million, or $2.03 per diluted share •Rail North America’s fleet utilization remained high at 99.4%; Lease Price Index (LPI) at positive 33% •First-quarter investment volume totaled $378.6 million •Company reiterates 2024 full-year earnings guidance CHICAGO, A

April 23, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): April 23, 2024 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 Numbe

March 15, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ 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 14

March 15, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ 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)) ☐ Defin

March 1, 2024 8-K

Entry into a Material Definitive Agreement

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): March 1, 2024 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

March 1, 2024 EX-4.1

Form of 5.400% Senior Notes due 2027.

Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

March 1, 2024 EX-1.1

Underwriting Agreement, dated February 27, 2024, between GATX and BofA Securities, Inc. and Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 $350,000,000 GATX CORPORATION 5.400% SENIOR NOTES DUE 2027 UNDERWRITING AGREEMENT February 27, 2024 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I hereto Ladies and Gentlemen: GA

February 28, 2024 424B5

GATX Corporation $350,000,000 5.400% Senior Notes due 2027

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement February 27, 2024 (To Prospectus dated February 27, 2024) GATX Corporation $350,000,000 5.400% Senior Notes due 2027 We are offering for sale $350,000,000 aggregate principal amount of 5.400% senior notes due 2027 (the “notes”). The notes will bear interest at the rate of 5.400% per year. Interest

February 28, 2024 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Propos

EX-FILING FEES Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 5.

February 27, 2024 424B3

SUBJECT TO COMPLETION, DATED FEBRUARY 27, 2024

Table of Contents The information in this preliminary prospectus supplement is not complete and may be changed.

February 27, 2024 FWP

GATX Corporation PRICING TERM SHEET February 27, 2024 Issuer: GATX Corporation Pricing Date: February 27, 2024 Expected Settlement Date*: March 1, 2024 (T+3) Expected Ratings**: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch: BBB+ (Stable) Securi

Pursuant to Rule 433 Registration No. 333-264721 February 27, 2024 GATX Corporation PRICING TERM SHEET February 27, 2024 Issuer: GATX Corporation Pricing Date: February 27, 2024 Expected Settlement Date*: March 1, 2024 (T+3) Expected Ratings**: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch: BBB+ (Stable) Security: 5.400% Senior Notes due 2027 Size: $350,000,000 Maturity Date: March 15, 2027 C

February 16, 2024 EX-21

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT The following is a list of subsidiaries included in our consolidated financial statements and the state or country of incorporation of each: Company Name State or Country of Incorporation GATX Terminals Overseas Holding Corporation (1) Delaware GATX Global Finance B.

February 16, 2024 EX-97

GATX Corporation Policy for Recovery of Erroneously Awarded Compensation, effective as of October 2, 2023.*

1 GATX CORPORATION POLICY FOR RECOVERY OF ERRONEOUSLY AWARDED COMPENSATION Board Company this Policy for Recovery of Erroneously Awarded Policy October 2, 2023 Effective Date .

February 16, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SEC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 1-2328 GATX Corporation (Exact name of registrant as specified in its

February 16, 2024 EX-10.1

Summary of Non-Employee Directors' Compensation.*

NON-EMPLOYEE DIRECTOR COMPENSATION The Compensation Committee, with assistance from Pay Governance, reviews and makes recommendations to the Board regarding the form and amount of compensation for non- -employee director compensation program is designed to enable continued attraction and retention of highly qualified directors and to address the time, effort, expertise, and accountability required of active Board membership.

February 13, 2024 SC 13G/A

GATX / GATX Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: GATX Corp Title of Class of Securities: Common Stock CUSIP Number: 361448103 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 13d

February 9, 2024 SC 13G/A

GATX / GATX Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 13 )* GATX Corp (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designat

January 26, 2024 EX-99.1

FOR IMMEDIATE RELEASE GATX CORPORATION ADDS JOHN HOLMES TO BOARD OF DIRECTORS CHICAGO, Jan. 26, 2024 − GATX Corporation (NYSE: GATX) today announced the election of John M. Holmes to its board of directors. Mr. Holmes will also serve as a member of t

a01262024holmesannouncem FOR IMMEDIATE RELEASE GATX CORPORATION ADDS JOHN HOLMES TO BOARD OF DIRECTORS CHICAGO, Jan.

January 26, 2024 8-K

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): January 26, 2024 GATX Corporation

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): January 26, 2024 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 Num

January 23, 2024 EX-99.1

Tuesday, Jan. 23, 2024 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 (Domestic) or 1-647-362-9199 (International) / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2023 FOURTH-QUARTER AND FULL-YEAR RESULTS •Full-year 2023 net income was $259.2 million or $7.12 per diluted share, including a net positive impact from Tax Adjustments and Other Items of $0.05 per diluted share •Full-year investment volume exceeded $1.6 billion •Company initiates 2024 earnings guidance of $7.30–$7.70 per dil

January 23, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 23, 2024 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 Num

November 2, 2023 8-K

Entry into a Material Definitive Agreement

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): October 31, 2023 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 Num

November 2, 2023 EX-4.1

Form of 6.900% Senior Notes due 2034.

Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

November 2, 2023 EX-1.1

Underwriting Agreement, dated October 31, 2023, between GATX and BofA Securities, Inc. and Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 $400,000,000 GATX CORPORATION 6.900% SENIOR NOTES DUE 2034 UNDERWRITING AGREEMENT October 31, 2023 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I hereto Ladies and Gentlemen: GAT

November 1, 2023 424B5

GATX Corporation $400,000,000 6.900% Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement October 31, 2023 (To Prospectus dated October 31, 2023) GATX Corporation $400,000,000 6.900% Senior Notes due 2034 We are offering for sale $400,000,000 aggregate principal amount of 6.900% senior notes due 2034 (the “notes”). The notes will bear interest at the rate of 6.900% per year. Interest on

November 1, 2023 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt  6.

October 31, 2023 FWP

GATX Corporation PRICING TERM SHEET October 31, 2023 Issuer: GATX Corporation Pricing Date: October 31, 2023 Expected Settlement Date: November 2, 2023 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch BBB+ (Stable) Security

Pursuant to Rule 433 Registration No. 333-264721 October 31, 2023 GATX Corporation PRICING TERM SHEET October 31, 2023 Issuer: GATX Corporation Pricing Date: October 31, 2023 Expected Settlement Date: November 2, 2023 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch BBB+ (Stable) Security: 6.900% Senior Notes due 2034 Size: $400,000,000 Maturity Date: May 1, 2034 Coupon:

October 31, 2023 424B3

SUBJECT TO COMPLETION, DATED OCTOBER 31, 2023

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-264721 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not pe

October 26, 2023 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Robert C. Lyons, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

October 26, 2023 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

October 26, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specifi

October 24, 2023 8-K

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): October 24, 2023 GATX Corporation

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): October 24, 2023 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 Num

October 24, 2023 EX-99.1

Tuesday, October 24, 2023 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 or 1-647-362-9199 / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2023 THIRD-QUARTER RESULTS •Company expects to modestly exceed the high end of the previously announced 2023 full-year earnings guidance range •Rail North America’s fleet utilization remained high at 99.3%; Lease Price Index (LPI) at positive 33.4% •Aircraft spare engine portfolio benefiting from global air travel recovery •I

September 8, 2023 EX-1.1

Underwriting Agreement, dated September 6, 2023, between GATX and BofA Securities, Inc. and Citigroup Global Markets Inc., as representatives of the several underwriters named therein.

Exhibit 1.1 $300,000,000 GATX CORPORATION 6.050% SENIOR NOTES DUE 2034 UNDERWRITING AGREEMENT September 6, 2023 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 As Representatives of the Underwriters Listed in Schedule I hereto Ladies and Gentlemen: GATX Corporation, a New York corporation (the “Company”), proposes

September 8, 2023 EX-4.1

Form of 6.050% Senior Notes due 2034.

Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

September 8, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): September 6, 2023 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 Nu

September 7, 2023 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

EX-FILING FEES Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 6.

September 7, 2023 424B5

GATX Corporation $300,000,000 6.050% Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement September 6, 2023 (To Prospectus dated September 6, 2023) GATX Corporation $300,000,000 6.050% Senior Notes due 2034 We are offering for sale $300,000,000 aggregate principal amount of 6.050% senior notes due 2034 (the “notes”). The notes will bear interest at the rate of 6.050% per year. Interest

September 6, 2023 424B3

SUBJECT TO COMPLETION, DATED SEPTEMBER 6, 2023

424B3 Table of Contents The information in this preliminary prospectus supplement is not complete and may be changed.

September 6, 2023 FWP

GATX Corporation PRICING TERM SHEET September 6, 2023 Issuer: GATX Corporation Pricing Date: September 6, 2023 Expected Settlement Date: September 8, 2023 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch BBB+ (Stable) Secur

FWP Pursuant to Rule 433 Registration No. 333-264721 September 6, 2023 GATX Corporation PRICING TERM SHEET September 6, 2023 Issuer: GATX Corporation Pricing Date: September 6, 2023 Expected Settlement Date: September 8, 2023 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch BBB+ (Stable) Security: 6.050% Senior Notes due 2034 Size: $300,000,000 Maturity Date: March 15, 2

August 14, 2023 CORRESP

Guidance range1

GATX Corporation 233 S. Wacker Drive Chicago, IL 60606-7147 Thomas A. Ellman Executive Vice President and Chief Financial Officer Tel: 312.621.4560 Fax: 312.499.7332 [email protected] August 14, 2023 Division of Corporation Finance Office of Energy & Transportation 100 F Street, N.E. Washington, D.C. 20549 Attention: Ms. Yolanda Guobadia Mr. Robert Babula Re: GATX Corporation Form 10-K for th

July 28, 2023 EX-99.1

Exhibit 99.1 NEWS RELEASE NEWS RELEASE GATX Corporation Adds Shelley Bausch to Board of Directors 7/28/2023 CHICAGO--(BUSINESS WIRE)-- GATX Corporation (NYSE: GATX) today announced the election of Shelley J. Bausch to its board of directors. Ms. Baus

bauschannouncement Exhibit 99.1 NEWS RELEASE NEWS RELEASE GATX Corporation Adds Shelley Bausch to Board of Directors 7/28/2023 CHICAGO-(BUSINESS WIRE)- GATX Corporation (NYSE: GATX) today announced the election of Shelley J. Bausch to its board of directors. Ms. Bausch will also serve as a member of the board’s Audit and Governance Committees. With the appointment of Ms. Bausch, the GATX board wil

July 28, 2023 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): July 28, 2023 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

July 27, 2023 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

July 27, 2023 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Robert C. Lyons, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

July 27, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified in

July 25, 2023 8-K

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): July 25, 2023 GATX Corporation (E

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): July 25, 2023 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

July 25, 2023 EX-99.1

Tuesday, July 25, 2023 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 or 1-647-362-9199 / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2023 SECOND-QUARTER RESULTS •Rail North America’s fleet utilization remained high at 99.3% •Investment volume was $486.6 million in the second quarter and totaled $873.6 million year to date •GATX's second-quarter direct investment of aircraft spare engines totaled $239 million •Company expects to be at the upper end of or mo

July 13, 2023 SC 13D/A

GATX / GATX Corp. / GAMCO INVESTORS, INC. ET AL Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 12) GATX Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) David Goldman GAMCO Investors, Inc. One Corporate Center Rye, New York 10580-1435 (914) 921-5000 (Name, Address and Telephone Number of Person Authorized to Receive

June 28, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2022 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 28, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2022 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 26, 2023 CORRESP

**********

GATX Corporation 233 S. Wacker Drive Chicago, IL 60606-7147 Thomas A. Ellman Executive Vice President and Chief Financial Officer Tel: 312.621.4560 Fax: 312.499.7332 [email protected] June 26, 2023 Division of Corporation Finance Office of Energy & Transportation 100 F Street, N.E. Washington, D.C. 20549 Attention: Ms. Yolanda Guobadia Mr. Robert Babula Re: GATX Corporation Form 10-K for the

June 21, 2023 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the a

June 21, 2023 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A

11-K/A 1 gatx-2021123111xkahourly.htm 11-K/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numb

June 21, 2023 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the a

June 21, 2023 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the a

June 21, 2023 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A

11-K/A 1 gatx-2020123111xkasalaried.htm 11-K/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file nu

June 21, 2023 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K/A [x] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the a

May 24, 2023 EX-10.1

Extension Notice dated May 3, 2023, to Citibank N.A. as administrative agent of Five Year Credit Agreement dated as of May 21, 2021, as amended, among GATX Corporation, as borrower, Citibank, N.A. and BofA Securities, Inc., as joint lead arrangers and joint book managers, Bank of America, N.A., as syndication agent, PNC Bank, National Association, U.S. Bank, National Association, Morgan Stanley MUFG Loan Partners, LLC and KeyBank National Association, as co-documentation agents, Citibank, N.A., as administrative agent, and the lenders party thereto is incorporated by reference to Exhibit 10.1 to GATX’s Form 8-K dated May 24, 2023, file number 1-2328.

EX-10.1 Exhibit 10.1 May 3, 2023 EXTENSION REQUEST Citibank, N.A., as Administrative Agent One Penns Way, OPS 2/2 New Castle, Delaware 19720 Attention: Bank Loan Syndications Five Year Credit Agreement dated as of May 21, 2021 (as amended or modified from time to time, the “Credit Agreement”) among GATX Corporation, a New York corporation, the Lenders parties thereto and Citibank, N.A., as adminis

May 24, 2023 8-K

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): May 19, 2023 GATX Corporation (Ex

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): May 19, 2023 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)

May 11, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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): May 11, 2023 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)

May 11, 2023 EX-99.1

2023 COMPANY OVERVIEW 2 History and Business Overview Railcar Leasing Business Model Rail North America Rail International Portfolio Management Trifleet Financial Highlights Reconciliation of Non-GAAP Measures 4 16 23 39 49 54 58 63 Section Slide No.

a2023companyoverview-fin 2023 COMPANY OVERVIEW 2 History and Business Overview Railcar Leasing Business Model Rail North America Rail International Portfolio Management Trifleet Financial Highlights Reconciliation of Non-GAAP Measures 4 16 23 39 49 54 58 63 Section Slide No.

May 4, 2023 EX-4.1

Form of 5.450% Senior Notes due 2033.

EX-4.1 Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTH

May 4, 2023 8-K

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): May 1, 2023 GATX Corporation (Exa

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): May 1, 2023 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)

May 4, 2023 EX-1.1

Underwriting Agreement, dated May 1, 2023, between GATX and BofA Securities, Inc., Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 $400,000,000 GATX CORPORATION 5.450% SENIOR NOTES DUE 2033 UNDERWRITING AGREEMENT May 1, 2023 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I hereto Ladies and Gentlemen: GATX Cor

May 2, 2023 424B5

GATX Corporation $400,000,000 5.450% Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement May 1, 2023 (To Prospectus dated May 1, 2023) GATX Corporation $400,000,000 5.450% Senior Notes due 2033 We are offering for sale $400,000,000 aggregate principal amount of 5.450% senior notes due 2033 (the “notes”). The notes will bear interest at the rate of 5.450% per year. Interest on the notes

May 2, 2023 8-K

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): April 28, 2023 GATX Corporation (

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): April 28, 2023 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 Numbe

May 2, 2023 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

EX-FILING FEES Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 5.

May 1, 2023 FWP

GATX Corporation PRICING TERM SHEET May 1, 2023 Issuer: GATX Corporation Pricing Date: May 1, 2023 Expected Settlement Date: May 3, 2023 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch BBB+ (Stable) Security: 5.450% Senior

FWP Pursuant to Rule 433 Registration No. 333-264721 May 1, 2023 GATX Corporation PRICING TERM SHEET May 1, 2023 Issuer: GATX Corporation Pricing Date: May 1, 2023 Expected Settlement Date: May 3, 2023 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) / Fitch BBB+ (Stable) Security: 5.450% Senior Notes due 2033 Size: $400,000,000 Maturity Date: September 15, 2033 Coupon: 5.450% I

May 1, 2023 424B3

SUBJECT TO COMPLETION, DATED MAY 1, 2023

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-264721 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is

April 28, 2023 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

April 28, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified i

April 28, 2023 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Robert C. Lyons, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

April 25, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): April 25, 2023 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 Numbe

April 25, 2023 EX-99.1

Tuesday, April 25, 2023 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 or 1-647-362-9199 / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2023 FIRST-QUARTER RESULTS •Demand for railcars remains strong across all regions •First-quarter investment volume totals $387 million •Company reiterates 2023 full-year earnings guidance CHICAGO, April 25, 2023 - GATX Corporation (NYSE:GATX) today reported 2023 first-quarter net income of $77.4 million, or $2.16 per diluted

March 17, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Fil ed by a Party other than the Registrant ☐ Check the appropriate bo x: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Def

February 16, 2023 EX-10.1

Summary of GATX Corporation Non-Employee Directo

Exhibit 10.1 NON-EMPLOYEE DIRECTOR COMPENSATION The Compensation Committee, with assistance from Pay Governance, reviews and makes recommendations to the Board regarding the form and amount of compensation for non- -employee director compensation program is designed to enable continued attraction and retention of highly qualified directors and to address the time, effort, expertise, and accountabi

February 16, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SEC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934Commission File Number 1-2328 GATX Corporation (Exact name of registrant as specified in its ch

February 16, 2023 EX-10.2

GATX Corporation U.S. Executive Severance Plan, effective as of February 15, 2023, is incorporated herein by reference to Exhibit 10.2 to GATX's Annual Report on Form 10-K for the fiscal year ended December 31, 2022, file number 1-2328.*

Exhibit 10.2 GATX CORPORATION U.S. EXECUTIVE SEVERANCE PLAN (AND SUMMARY PLAN DESCRIPTION) Effective February 15, 2023 This GATX Corporation U.S. Executive Severance Plan (this Plan ) is effective as of February 15, 2023. The purpose of this Plan is to provide severance benefits to certain eligible executive-level employees of GATX Corporation (the Company ) whose employment with a Participating C

February 16, 2023 EX-21

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT The following is a list of subsidiaries included in our consolidated financial statements and the state or country of incorporation of each: Company Name State or Country of Incorporation GATX Terminals Overseas Holding Corporation (1) Delaware GATX Global Finance B.

February 10, 2023 SC 13G/A

GATX / GATX Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 12 )* GATX Corp (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designat

February 9, 2023 SC 13G/A

GATX / GATX Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0967-gatxcorp.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: GATX Corp. Title of Class of Securities: Common Stock CUSIP Number: 361448103 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursu

February 7, 2023 EX-99.1

Stifel 2023 Transportation & Logistics Conference February 7, 2023 Statements in this presentation not based on historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 and, accordin

Stifel 2023 Transportation & Logistics Conference February 7, 2023 Statements in this presentation not based on historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 and, accordingly, involve known and unknown risks and uncertainties that are difficult to predict and could cause our actual results, performance, or achievements to differ materially from those discussed.

February 7, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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 7, 2023 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 Num

February 6, 2023 SC 13G/A

GATX / GATX Corporation / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* GATX Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Sched

January 24, 2023 EX-99.1

Tuesday, Jan. 24, 2023 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 or 1-647-362-9199 / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2022 FOURTH-QUARTER AND FULL-YEAR RESULTS •Rail North America and Rail International fleet utilization remained above 99% •Lease rates in North America increased sequentially for tenth consecutive quarter •Full-year investment volume exceeded $1.0 billion for third consecutive year •Company initiates 2023 earnings guidance of

January 24, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 24, 2023 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 Num

November 1, 2022 EX-3.1

Amended and Restated By-Laws of GATX Corporation, as amended and restated on October 28, 2022, are incorporated herein by reference to Exhibit 3.1 of GATX’s Form 8-K dated November 1, 2022, file number 1-2328.

Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF GATX CORPORATION October 28, 2022 ARTICLE I MEETING OF SHAREHOLDERS Section 1. Place of Meeting. Every meeting of the shareholders of GATX Corporation (hereinafter called the ?Corporation?) shall be held at the principal office of the Corporation in the State of New York, or at such other place in or out of said State as shall be specified in the notice

November 1, 2022 EX-99.1

GATX CORPORATION ANNOUNCES THE APPOINTMENT OF JAMES B. REAM AS INDEPENDENT CHAIR OF THE BOARD

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION ANNOUNCES THE APPOINTMENT OF JAMES B. REAM AS INDEPENDENT CHAIR OF THE BOARD CHICAGO, Nov. 1, 2022 ? GATX Corporation (NYSE:GATX) today announced that James B. Ream has been named as the Company?s independent chair of its board of directors, effective today. Mr. Ream succeeds Brian A. Kenney, who retired as the Company?s president an

November 1, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events

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): October 28, 2022 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 Num

October 28, 2022 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

October 28, 2022 EX-10.1

Supply Agreement by and between GATX Corporation, as Buyer, and Trinity Rail Group, LLC, as Seller, dated September 30, 2022 is incorporated by reference to Exhibit 10.1 to GATX’s Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2022, file number 1-2328 (Note: Portions of this document have been omitted pursuant to Item 601 of Regulation S-K).

Exhibit 10.1 Pursuant to Item 601 of Regulation S-K, certain identified information has been excluded from the exhibit because it both (i) is not material and (ii) would be competitively harmful if publicly disclosed. Information that was omitted has been noted in this document with a placeholder ** SUPPLY AGREEMENT This Agreement 30th day of September, 2022 Effective Date Buyer Seller Parties Par

October 28, 2022 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Robert C. Lyons, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

October 28, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specifi

October 25, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 25, 2022 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 Num

October 25, 2022 EX-99.1

Tuesday, Oct. 25, 2022 11 a.m. Eastern Time Domestic Dial-In: 1-888-660-6118 International Dial-In: 1-929-203-1802 Replay: 1-800-770-2030 or 1-647-362-9199 / Access Code: 2548217

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2022 THIRD-QUARTER RESULTS ?Fleet utilization at Rail North America and Rail International remains above 99% ?Company expects to be at the upper end of the previously announced 2022 full-year earnings guidance range ?Investment volume totaled approximately $888 million year to date CHICAGO, Oct. 25, 2022 - GATX Corporation (N

October 3, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

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): September 30, 2022 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 N

October 3, 2022 EX-99.1

FOR IMMEDIATE RELEASE GATX CORPORATION ANNOUNCES LONG-TERM RAILCAR SUPPLY AGREEMENT CHICAGO, Oct. 3, 2022 − GATX Corporation (NYSE:GATX) has entered into a new long-term railcar supply agreement with a subsidiary of Trinity Industries, Inc. (“Trinity

FOR IMMEDIATE RELEASE GATX CORPORATION ANNOUNCES LONG-TERM RAILCAR SUPPLY AGREEMENT CHICAGO, Oct.

September 20, 2022 EX-99.1

FOR IMMEDIATE RELEASE GATX CORPORATION ANNOUNCES RETIREMENT OF DEBORAH A. GOLDEN, EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND CORPORATE SECRETARY; BOARD APPOINTS BRIAN L. GLASSBERG AS SUCCESSOR CHICAGO, Sept. 20, 2022 − Deborah A. Golden, executive

FOR IMMEDIATE RELEASE GATX CORPORATION ANNOUNCES RETIREMENT OF DEBORAH A. GOLDEN, EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND CORPORATE SECRETARY; BOARD APPOINTS BRIAN L. GLASSBERG AS SUCCESSOR CHICAGO, Sept. 20, 2022 ? Deborah A. Golden, executive vice president, general counsel and corporate secretary of GATX Corporation (NYSE:GATX), has elected to retire effective Nov. 30, 2022. Ms. Golden jo

September 20, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): September 16, 2022 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 N

August 12, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): August 9, 2022 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 Numbe

August 12, 2022 EX-1.1

Underwriting Agreement, dated August 8, 2022, between GATX and BofA Securities, Inc., Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

EX-1.1 2 d317388dex11.htm EX-1.1 EXHIBIT 1.1 $400,000,000 GATX CORPORATION 4.900% SENIOR NOTES DUE 2033 UNDERWRITING AGREEMENT August 8, 2022 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I h

August 12, 2022 EX-4.1

Form of 4.900% Senior Notes due 2033.

Exhibit 4.1 THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMI

August 12, 2022 EX-10.1

Employment Agreement, effective as of October 1, 2022, between GATX Corporation and Necati Gokce Tezel.

VP/#56000596 EMPLOYMENT AGREEMENT This Employment Agreement (the ?Agreement?) is entered into as of October 1, 2022 (the ?Effective Date?) between GATX Corporation, a New York corporation (the ?Company?), and Necati Gokce Tezel (the ?Executive?).

August 12, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): August 8, 2022 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 Numbe

August 9, 2022 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 4.

August 9, 2022 424B5

GATX Corporation $400,000,000 4.900% Senior Notes due 2033

424B5 1 d381864d424b5.htm 424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-264721 Prospectus Supplement August 8, 2022 (To Prospectus dated August 8, 2022) GATX Corporation $400,000,000 4.900% Senior Notes due 2033 We are offering for sale $400,000,000 aggregate principal amount of 4.900% senior notes due 2033 (the “notes”). The notes will bear interest at the rate of

August 8, 2022 FWP

GATX Corporation PRICING TERM SHEET August 8, 2022 Issuer: GATX Corporation Pricing Date: August 8, 2022 Expected Settlement Date: August 10, 2022 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) Security: 4.900% Senior Notes due 2

Pursuant to Rule 433 Registration No. 333-264721 August 8, 2022 GATX Corporation PRICING TERM SHEET August 8, 2022 Issuer: GATX Corporation Pricing Date: August 8, 2022 Expected Settlement Date: August 10, 2022 (T+2) Expected Ratings*: Moody?s: Baa2 (Stable) / S&P: BBB (Stable) Security: 4.900% Senior Notes due 2033 Size: $400,000,000 Maturity Date: March 15, 2033 Coupon: 4.900% Interest Payment D

August 8, 2022 424B3

SUBJECT TO COMPLETION, DATED AUGUST 8, 2022

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-264721 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not pe

July 29, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified in

July 29, 2022 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

July 29, 2022 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Robert C. Lyons, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

July 21, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 21, 2022 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

July 21, 2022 EX-99.1

Thursday, July 21, 2022 11 a.m. Eastern Time Domestic Dial-In: 1-800-289-0720 International Dial-In: 1-323-701-0160 Replay: 1-888-203-1112 or 1-719-457-0820 / Access Code: 4208735

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2022 SECOND-QUARTER RESULTS ?Company increases 2022 full-year earnings guidance to $5.60 - $6.00 per diluted share ?Demand for railcars remains strong across all regions ?Investment volume was $314.1 million in the second quarter and totaled $684.5 million year to date CHICAGO, July 21, 2022 - GATX Corporation (NYSE:GATX) tod

July 1, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): June 30, 2022 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

June 28, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

11-K 1 gatx-2021123111xksalaried.htm 11-K UNITED STATES 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 1934 For the fiscal year ended December 31, 2021 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-

June 28, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2021 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

May 26, 2022 EX-10.1

Amendment No. 1 to Five Year Credit Agreement dated as of May 21, 2021, among GATX as borrower, Citibank, N.A. and BofA Securities, Inc., as joint lead arrangers and joint book managers, Bank of America, N.A., as syndication agent, PNC Bank, National Association, U.S. Bank, National Association, Morgan Stanley MUFG Loan Partners, LLC and KeyBank National Association, as co-documentation agents, Citibank, N.A., as administrative agent, and the lenders party thereto is incorporated by reference to Exhibit 10.1 to GATX’s Form 8-K dated May 26, 2022, file number 1-2328.

Exhibit 10.1 EXECUTION VERSION AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of May 23, 2022 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this ?Amendment?) among GATX CORPORATION, a New York corporation (the ?Borrower?), the banks, financial institutions and other institutional lenders parties to the Credit Agreement referred to below (collectively, the ?Lenders?) and CITIBANK, N.A., as agent (the

May 26, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): May 23, 2022 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)

May 5, 2022 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3ASR (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registrat

May 5, 2022 EX-25.1

Form T-1, Statement of Eligibility of the Debt Trustee for the Indenture.

EX-25.1 6 d297873dex251.htm EX-25.1 Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified

May 5, 2022 EX-25.2

Form T-1, Statement of Eligibility of the Debt Trustee for the Subordinated Indenture.

Exhibit 25.2 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

May 5, 2022 EX-25.3

Form T-1, Statement of Eligibility of the Pass Through Trustee.

Exhibit 25.3 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

May 5, 2022 S-3ASR

As filed with the Securities and Exchange Commission on May 5, 2022

Table of Contents As filed with the Securities and Exchange Commission on May 5, 2022 Registration No.

April 28, 2022 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Robert C. Lyons, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

April 28, 2022 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

April 28, 2022 EX-10.3

Form of Non-Qualified Stock Option Agreement for awards under the GATX Corporation 2012 Incentive Award Plan to executive officers with Agreements for Employment Following a Change of Control, is incorporated by reference to Exhibit 10.3 to GATX's Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2022, file number 1-2328.*

US-DOCS\126876353.4 GATX CORPORATION 2012 INCENTIVE AWARD PLAN OPTION AGREEMENT GATX Corporation (the "Company") hereby grants on the Grant Date to the Participant as an incentive to advance the interests of the Company an option (the "Option") to purchase the number of Shares set forth on the Shareworks website (https://www.shareworks.com) or any successor administrator the Committee may designat

April 28, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified i

April 28, 2022 EX-10.1

Amended and Restated GATX Corporation Directors' Voluntary Deferred Fee Plan, effective as of January 1, 2022, is incorporated by reference to Exhibit 10.1 to GATX's Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2022, file number 1-2328.*

US-DOCS\125415451.2 GATX CORPORATION DIRECTORS? VOLUNTARY DEFERRED FEE PLAN AMENDED AND RESTATED AS OF JANUARY 1, 2022 Section 1. PURPOSE AND EFFECTIVE DATE. The purpose of the Directors? Voluntary Deferred Fee Plan is to provide to non-employee directors of GATX Corporation (the ?Company?) an opportunity to receive that portion of their annual retainers and meeting attendance fees on a deferred b

April 28, 2022 EX-10.4

Form of Performance Share Agreement (with cash-election option) for grants under the GATX Corporation 2012 Incentive Award Plan to executive officers with Agreements for Employment Following a Change of Control is incorporated by reference to Exhibit 10.4 of GATX's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2022, file number 1-2328.*

1 US-DOCS\126877881.4 GATX CORPORATION 2012 INCENTIVE AWARD PLAN PERFORMANCE SHARE AGREEMENT FOR EXECUTIVE OFFICERS This PERFORMANCE SHARE AGREEMENT (this ?Agreement?) is entered into as of February 16, 2022 (the ?Grant Date?) by and between the Participant and GATX Corporation (the "Company") in respect of the performance period beginning on January 1, 2022 through and including December 31, 2024

April 28, 2022 EX-10.2

Form of Restricted Stock Unit Agreement for Grants under the Amended and Restated 2012 Incentive Award Plan to directors is incorporated by reference to Exhibit 10.2 to GATX’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2022, file number 1-2328.*

GATX CORPORATION 2012 AMENDED AND RESTATED INCENTIVE AWARD PLAN RESTRICTED STOCK UNIT AGREEMENT - DIRECTORS In partial consideration of the provision of services by the Participant, an director of GATX Corporation (the "Company"), and as further incentive for the Participant to advance the interests of the Company, the Company hereby grants to the Participant, on the Grant Date, Restricted Stock Units (the "RSUs") with respect to the same number of Shares of the Company pursuant to the GATX Corporation 2012 Amended and Restated Incentive Award Plan (the ?Plan?).

April 27, 2022 8-K

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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): April 22, 2022 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 Numbe

April 20, 2022 EX-99.1

Wednesday, April 20, 2022 11 a.m. Eastern Time Domestic Dial-In: 1-800-289-0720 International Dial-In: 1-323-701-0160 Replay: 1-888-203-1112 or 1-719-457-0820 /Access Code: 4973176

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2022 FIRST-QUARTER RESULTS ?Rail North America?s fleet utilization remained high at 99.3% ?Company reiterates 2022 full-year earnings guidance CHICAGO, April 20, 2022 - GATX Corporation (NYSE:GATX) today reported 2022 first-quarter net income of $75.8 million, or $2.10 per diluted share, compared to net income of $36.5 millio

April 20, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): April 20, 2022 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 Numbe

April 8, 2022 EX-99.1

2022 COMPANY OVERVIEW History and Business Overview................................................................................................... Railcar Leasing Business Model.....................................................................

2022 COMPANY OVERVIEW History and Business Overview................................................................................................... Railcar Leasing Business Model................................................................................................... Rail North America ....................................................................................................

April 8, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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): April 8, 2022 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

March 30, 2022 EX-99.1

Financial Statements of Alpha Partners Leasing Limited.

Alpha Partners Leasing Limited Consolidated Financial Statements for the Year Ended 31 December 2021 Alpha Partners Leasing Limited Contents Statement of .

March 30, 2022 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K/A (Amendment No. 1) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2021 or ☐ TRANSITION RE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K/A (Amendment No. 1) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 1-2328 GATX Corporation (Exact name of registrant

March 11, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? 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 14

March 8, 2022 EX-1.1

Underwriting Agreement, dated March 2, 2022, between GATX and BofA Securities, Inc., Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

EXHIBIT 1.1 $400,000,000 GATX CORPORATION 3.500% SENIOR NOTES DUE 2032 UNDERWRITING AGREEMENT March 2, 2022 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I hereto Ladies and Gentlemen: GATX C

March 8, 2022 EX-4.1

Form of 3.500% Senior Notes due 2032.

Exhibit 4.1 [THIS SECURITY IS A GLOBAL SECURITY. IT IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY (AS HEREINAFTER DEFINED) OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES HEREINAFTER DESCRIBED AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOM

March 8, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): March 2, 2022 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

March 4, 2022 424B5

$400,000,000 GATX Corporation $400,000,000 3.500% Senior Notes due 2032

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-233276 Prospectus Supplement March 2, 2022 (To Prospectus dated August 14, 2019) $400,000,000 GATX Corporation $400,000,000 3.500% Senior Notes due 2032 We are offering for sale $400,000,000 aggregate principal amount of 3.500% senior notes due 2032 (the ?notes?). The notes will bear interest at the rate of 3.500% per year. In

March 4, 2022 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Propos

Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(5)1 (Form Type) GATX Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial effective date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt 3.

March 2, 2022 424B3

SUBJECT TO COMPLETION, DATED MARCH 2, 2022

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-233276 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not pe

March 2, 2022 FWP

GATX Corporation PRICING TERM SHEET March 2, 2022 Issuer: GATX Corporation Pricing Date: March 2, 2022 Expected Settlement Date: March 4, 2022 (T+2) Expected Ratings*: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) Security: 3.500% Senior Notes due 2032

Pursuant to Rule 433 Registration No. 333-233276 March 2, 2022 GATX Corporation PRICING TERM SHEET March 2, 2022 Issuer: GATX Corporation Pricing Date: March 2, 2022 Expected Settlement Date: March 4, 2022 (T+2) Expected Ratings*: Moody?s: Baa2 (Stable) / S&P: BBB (Stable) Security: 3.500% Senior Notes due 2032 Size: $400,000,000 Maturity Date: June 1, 2032 Coupon: 3.500% Interest Payment Dates: J

February 17, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2021 or ☐ TRANSITION REPORT PURSUANT TO SEC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 1-2328 GATX Corporation (Exact name of registrant as specified in its

February 17, 2022 EX-21

Subsidiaries of the Registrant.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT The following is a list of subsidiaries included in our consolidated financial statements and the state or country of incorporation of each: Company Name State or Country of Incorporation GATX Terminals Overseas Holding Corporation (1) Delaware GATX Global Finance B.

February 17, 2022 EX-24

Powers of Attorney with respect to the Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

Exhibit 24 POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Thomas A.

February 10, 2022 SC 13G/A

GATX / GATX Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: GATX Corp. Title of Class of Securities: Common Stock CUSIP Number: 361448103 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ??Rule 13

February 8, 2022 SC 13G/A

GATX / GATX Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 11 )* GATX Corp (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designat

February 4, 2022 SC 13G

GATX / GATX Corporation / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* GATX Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedul

February 2, 2022 EX-10.1

Form of Restricted Stock Unit Agreement for Grants under the Amended and Restated 2012 Incentive Award Plan to Thomas A. Ellman is incorporated by reference to Exhibit 10.1 to GATX’s Form 8-K dated January 28, 2022, file number 1-2328.*

GATX CORPORATION AMENDED AND RESTATED 2012 INCENTIVE AWARD PLAN RESTRICTED STOCK UNIT AGREEMENT GATX Corporation (the "Company") hereby grants on the Grant Date to the Participant as an incentive to advance the interests of the Company, the number of Restricted Stock Units (the "RSUs") set forth on the Shareworks website (https://www.

February 2, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): January 28, 2022 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 Num

February 2, 2022 EX-10.2

Form of Confidential Information, Non-Competition, and Non-Solicitation Agreement between the Corporation and Thomas A. Ellman is incorporated by reference to Exhibit 10.2 to GATX’s Form 8-K dated January 28, 2022, file number 1-2328.*

CONFIDENTIAL INFORMATION, NON-COMPETITION, AND NON-SOLICITATION AGREEMENT In consideration, for the grant to Employee of restricted stock units pursuant RSU Agreement and for other good and valid consideration, Employee and GATX Corporation (together with any of its subsidiaries, the Company -Competition, and Non-Solicitation Agreement Agreement the date executed below Effective Date , on the following terms and conditions: A.

January 25, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): January 25, 2022 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 Num

January 25, 2022 EX-99.1

Three Months Ended December 31 Twelve Months Ended December 31 Per Diluted Share 2021 2020 2021 2020 Income from Continuing Operations $ 1.69 $ 0.50 $ 3.98 $ 4.24 Income from Discontinued Operations — — — 0.03 Total $ 1.69 $ 0.50 $ 3.98 $ 4.27

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2021 FOURTH-QUARTER AND FULL-YEAR RESULTS •Fourth-quarter 2021 net income from continuing operations was $61.0 million or $1.69 per diluted share •Rail North America’s fleet utilization remained high at 99.2% •Full-year investment volume exceeded $1.0 billion CHICAGO, Jan. 25, 2022 - GATX Corporation (NYSE:GATX) today reporte

December 22, 2021 SC 13D/A

GATX / GATX Corporation / GAMCO INVESTORS, INC. ET AL Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 11) GATX Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 361448103 (CUSIP Number) David Goldman GAMCO Investors, Inc. One Corporate Center Rye, New York 10580-1435 (914) 921-5000 (Name, Address and Telephone Number of Person Authorized to Receive

December 7, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

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): December 3, 2021 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 Num

December 7, 2021 EX-99.1

GATX CORPORATION ANNOUNCES CEO LEADERSHIP TRANSITION PROCESS

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION ANNOUNCES CEO LEADERSHIP TRANSITION PROCESS ?Brian A. Kenney to retire as CEO in April 2022; Kenney to continue as non-executive chairman for a transition period ?Board names Robert C. Lyons as CEO-elect CHICAGO, Dec. 7, 2021 - GATX Corporation (NYSE:GATX) today announced Brian A. Kenney will retire as president and CEO, effective Ap

December 7, 2021 EX-3.1

Amended and Restated By-Laws of GATX Corporation, as amended and restated on December 3, 2021, are incorporated herein by reference to Exhibit 3.1 of GATX's Form 8-K dated December 7, 2021, file number 1-2328.

1 Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF GATX CORPORATION December 3, 2021 ARTICLE I MEETING OF SHAREHOLDERS Section 1. Place of Meeting. Corporation shall be held at the principal office of the Corporation in the State of New York, or at such other place in or out of said State as shall be specified in the notice of such meeting or waiver of such notice. The Board (as defined below) may in i

November 12, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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): November 11, 2021 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 Nu

November 12, 2021 EX-99.1

BAIRD 2021 GLOBAL INDUSTRIAL CONFERENCE NOVEMBER 2021 - Securities Litigation Reform Act of 1995 and, accordingly, involve known and unknown risks and uncertainties that are difficult to predict and could cause our actual results, performance, or ach

BAIRD 2021 GLOBAL INDUSTRIAL CONFERENCE NOVEMBER 2021 - Securities Litigation Reform Act of 1995 and, accordingly, involve known and unknown risks and uncertainties that are difficult to predict and could cause our actual results, performance, or achievements to differ materially from those discussed.

October 29, 2021 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Brian A. Kenney, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

October 29, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specifi

October 29, 2021 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

October 21, 2021 EX-99.1

Three Months Ended September 30 Nine Months Ended September 30 Per Diluted Share 2021 2020 2021 2020 Income from Continuing Operations $ 1.11 $ 1.36 $ 2.28 $ 3.74 Income from Discontinued Operations — (0.01) — 0.03 Total $ 1.11 $ 1.35 $ 2.28 $ 3.77

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2021 THIRD-QUARTER RESULTS ?Net income for the third quarter 2021 was $40.1 million or $1.11 per diluted share ?Rail North America?s fleet utilization increased to 99.2% ?Company reiterates 2021 full-year earnings guidance CHICAGO, Oct. 21, 2021 - GATX Corporation (NYSE:GATX) today reported 2021 third-quarter results. Results

October 21, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 21, 2021 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 Num

September 8, 2021 EX-99.1

COWEN 14TH ANNUAL GLOBAL TRANSPORTATION & SUSTAINABLE MOBILITY CONFERENCE SEPTEMBER 2021 Statements in this presentation not based on historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act

gatxpresentationcowenco COWEN 14TH ANNUAL GLOBAL TRANSPORTATION & SUSTAINABLE MOBILITY CONFERENCE SEPTEMBER 2021 Statements in this presentation not based on historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 and, accordingly, involve known and unknown risks and uncertainties that are difficult to predict and could cause our actual results, performance, or achievements to differ materially from those discussed.

September 8, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

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): September 8, 2021 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 Nu

August 6, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): August 2, 2021 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 Numbe

August 6, 2021 EX-1.1

Underwriting Agreement, dated August 2, 2021, between GATX and BofA Securities, Inc., Citigroup Global Markets Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 $250,000,000 GATX CORPORATION 3.100% SENIOR NOTES DUE 2051 UNDERWRITING AGREEMENT August 2, 2021 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Morgan Stanley & Co. LLC 1585 Broadway New York, New York 10036 As Representatives of the Underwriters Listed in Schedule I hereto Ladies and Gentlemen: GATX

August 4, 2021 424B5

Title of Each Class of Securities to be Registered

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-233276 Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee(1) 3.100% Senior Notes due 2051 $250,000,000 97.615% $244,037,500 $26,624.49 (1) Calculated in accordance with Rule 457(r) of the Securities Act of 1933,

August 2, 2021 424B3

SUBJECT TO COMPLETION, DATED AUGUST 2, 2021

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-233276 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not pe

August 2, 2021 FWP

GATX Corporation PRICING TERM SHEET August 2, 2021 Issuer: GATX Corporation Pricing Date: August 2, 2021 Expected Settlement Date*: August 9, 2021 (T+5) Expected Ratings**: Moody’s: Baa2 (Stable) / S&P: BBB (Stable) Security: The Notes offered hereby

Pursuant to Rule 433 Registration No. 333-233276 August 2, 2021 GATX Corporation PRICING TERM SHEET August 2, 2021 Issuer: GATX Corporation Pricing Date: August 2, 2021 Expected Settlement Date*: August 9, 2021 (T+5) Expected Ratings**: Moody?s: Baa2 (Stable) / S&P: BBB (Stable) Security: The Notes offered hereby (the ?New Notes?) constitute a further issuance of the 3.100% Senior Notes due 2051 o

July 30, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 1-2328 GATX Corporation (Exact name of registrant as specified in

July 30, 2021 EX-31.B

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CFO Certification).

Exhibit 31B Certification of Principal Financial Officer I, Thomas A. Ellman, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such state

July 30, 2021 EX-31.A

Certification Pursuant to Exchange Act Rule 13a-14(a) and Rule 15d-14(a) (CEO Certification).

Exhibit 31A Certification of Principal Executive Officer I, Brian A. Kenney, certify that: 1.I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation (the "Company"); 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statem

July 20, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): July 20, 2021 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

July 20, 2021 EX-99.1

Three Months Ended June 30 Six Months Ended June 30 Per Diluted Share 2021 2020 2021 2020 Income from Continuing Operations $ 0.15 $ 1.05 $ 1.17 $ 2.38 Income from Discontinued Operations — 0.06 — 0.04 Total $ 0.15 $ 1.11 $ 1.17 $ 2.42

Exhibit 99.1 NEWS RELEASE FOR IMMEDIATE RELEASE GATX CORPORATION REPORTS 2021 SECOND-QUARTER RESULTS ?Net income for the second quarter 2021 was $5.5 million or $0.15 per diluted share ?Results include a non-cash, net negative impact of $39.7 million or $1.10 per diluted share related to an enacted tax rate increase in the United Kingdom ?Company increases 2021 full-year earnings guidance to $4.30

June 22, 2021 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2020 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 22, 2021 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES 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 1934 For the fiscal year ended December 31, 2020 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-2328 A. Full title of the plan and the add

June 1, 2021 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on June 14, 2021, pursuant to the provisions of Rule 12d2-2 (a).

May 27, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): May 21, 2021 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)

May 27, 2021 EX-10.1

Five Year Credit Agreement dated as of May 21, 2021, among GATX Corporation, as borrower, Citibank, N.A. and BofA Securities, Inc., as joint lead arrangers and joint book managers, Bank of America, N.A., as syndication agent, PNC Bank, National Association, U.S. Bank, National Association, Morgan Stanley MUFG Loan Partners, LLC and KeyBank National Association, as co-documentation agents, Citibank, N.A., as administrative agent, and the lenders party thereto is incorporated by reference to Exhibit 10.1 to GATX’s Form 8-K dated May 27, 2021, file number 1-2328.

Exhibit 10.1 EXECUTION COPY FIVE YEAR CREDIT AGREEMENT Dated as of May 21, 2021 Among GATX CORPORATION as Borrower and THE INITIAL LENDERS NAMED HEREIN as Initial Lenders and CITIBANK, N.A. as Administrative Agent and CITIBANK, N.A. and BOFA SECURITIES, INC. as Joint Lead Arrangers and Joint Book Managers and BANK OF AMERICA, N.A. as Syndication Agent and PNC BANK, NATIONAL ASSOCIATION U.S. BANK N

May 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: GATX Corp. Title of Class of Securities: Common Stock CUSIP Number: 361448103 Date of Event Which Requires Filing of this Statement: April 30, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ??Rule 13d-1

May 5, 2021 EX-99.1

*As of 12/31/2020 As of 12/31/2020 *Excludes boxcar fleet Based on 2020 Rail North America Revenue T H O U S A N D S Association of American Railroads Railway Supply Institute as of April 2021 *Excludes boxcar fleet LPI = Lease Price Index: The avera

*As of 12/31/2020 As of 12/31/2020 *Excludes boxcar fleet Based on 2020 Rail North America Revenue T H O U S A N D S Association of American Railroads Railway Supply Institute as of April 2021 *Excludes boxcar fleet LPI = Lease Price Index: The average renewal lease rate change is reported as the percentage change between the average renewal lease rate and the average expiring Renewal Success Rate: The percentage of expiring leases that were renewed with the existing lessee.

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