[Form 4] GATX CORP Insider Trading Activity

GATX CORP director James B. Ream received an automatic equity credit tied to his board compensation.

Rhea-AI Filing Summary

GATX CORP director James B. Ream received an automatic equity credit tied to his board compensation. On May 1, 2026, he acquired 169 shares of common stock in the form of phantom stock/RSUs at $194.9175 per share, pursuant to the dividend reinvestment feature of GATX’s directors’ Phantom Stock Plan and Deferred Fee Plan. Each phantom stock/RSU represents the right to receive one share of GATX common stock on a deferred basis, generally after he leaves the board. Following this credit, his reported direct common stock holdings total 49,306 shares.

Insider Trade Summary

Grant/Award: 169 shares

Grant/Award 1 txn

Insider REAM JAMES B

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	169	$194.9175	$33K

Holdings After Transaction: Common Stock — 49,306 shares (Direct)

Footnotes (2)

1. F1. Represents additional shares of phantom stock/RSUs credited to the reporting person's account under the Amended and Restated GATX Directors' Phantom Stock Plan ("Phantom Stock Plan") and the Amended and Restated GATX Corporation Directors' Voluntary Deferred Fee Plan ("Deferred Fee Plan") credited on the transaction date. Each share of phantom stock/RSU represents the right to receive one share of Issuer's common stock upon settlement. The shares of phantom stock/RSUs are generally payable on a deferred basis in common stock at the election of the reporting person upon the reporting person's termination of service on the Issuer's board of directors.
2. F2. Represents 169 shares of phantom stock/RSUs acquired pursuant to the dividend reinvestment feature of the Phantom Stock Plan and the Deferred Fee Plan.

Key Figures

Phantom stock/RSUs granted: 169 shares Grant reference price: $194.9175 per share Shares owned after transaction: 49,306 shares

3 metrics

Phantom stock/RSUs granted 169 shares Dividend reinvestment credit on May 1, 2026

Grant reference price $194.9175 per share Common Stock phantom stock/RSUs

Shares owned after transaction 49,306 shares Total reported direct common stock holdings post‑grant

Key Terms

phantom stock, RSUs, dividend reinvestment feature, Deferred Fee Plan

4 terms

phantom stock financial

"Represents additional shares of phantom stock/RSUs credited to the reporting person's account"

A phantom stock is a form of compensation that gives employees or executives the benefits of stock ownership, such as the increase in stock value, without actually giving them real shares. It acts like a promise to pay the employee the equivalent value of company stock later, often as a bonus or incentive. This allows companies to motivate and reward staff without diluting ownership or transferring actual shares.

RSUs financial

"Each share of phantom stock/RSU represents the right to receive one share of Issuer's common stock"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

dividend reinvestment feature financial

"Represents 169 shares of phantom stock/RSUs acquired pursuant to the dividend reinvestment feature"

Deferred Fee Plan financial

"Directors' Voluntary Deferred Fee Plan ("Deferred Fee Plan") credited on the transaction date"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/05/2026 - 12:19 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

REAM JAMES B

(Last) (First) (Middle)

C/O 233 S. WACKER DR.

(Street)

CHICAGO ILLINOIS 60606

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
GATX CORP [ GATX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock(1)	05/01/2026		A		169(2)	A	$194.9175	49,306	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents additional shares of phantom stock/RSUs credited to the reporting person's account under the Amended and Restated GATX Directors' Phantom Stock Plan ("Phantom Stock Plan") and the Amended and Restated GATX Corporation Directors' Voluntary Deferred Fee Plan ("Deferred Fee Plan") credited on the transaction date. Each share of phantom stock/RSU represents the right to receive one share of Issuer's common stock upon settlement. The shares of phantom stock/RSUs are generally payable on a deferred basis in common stock at the election of the reporting person upon the reporting person's termination of service on the Issuer's board of directors.

2. Represents 169 shares of phantom stock/RSUs acquired pursuant to the dividend reinvestment feature of the Phantom Stock Plan and the Deferred Fee Plan.

Remarks:

	Lisa M. Ibarra, by Power of Attorney on behalf of James B. Ream	05/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)