Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Kastner Janeen B. 2. Issuer Name and Ticker or Trading Symbol RPM INTERNATIONAL INC/DE/ [RPM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) VP Corp. Benefits/Risk Mgmt. (Last) (First) (Middle) 2628 PEARL ROAD 3. Date of Earliest Transaction (Month/Day/Year) 05/31/2026 (Street) MEDINA, OH 44256 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) 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, $0.01 par value 05/31/2026 F(1) 748 D $105.97 133,956(2) D Common Stock, $0.01 par value 1,123 I(3) By 401(k) Plan

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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 Underlying Securities (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 of Derivative Security: 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

Stock Appreciation Rights

(4)

(5)

(5)

Common Stock

190,000

190,000(5)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Kastner Janeen B. 2628 PEARL ROAD MEDINA, OH 44256			VP Corp. Benefits/Risk Mgmt.

Signatures

/s/ Janeen B. Kastner, by Gregory J. Dziak, her attorney-in-fact pursuant to Power of Attorney daed October 9, 2014 on file with the Commission		06/02/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	On May 31, 2026, 1,776 shares of Common Stock issued to the Reporting Person pursuant to the RPM International Inc. 2014 Omnibus Equity and Incentive Plan (the "Plan") vested. In accordance with the terms of the Plan, the Reporting Person disposed of 748 shares back to the issuer to satisfy tax obligations of the Reporting Person.
(2)	Includes an aggregate of 6,061 unvested restricted shares of Common Stock and 5,540 shares of Common Stock, issued as Performance Earned Restricted Stock.
(3)	Approximate number of shares of Common Stock held as of May 31, 2026 in the account of the Reporting Person by Fidelity Trust Management Company, as Trustee of the RPM International Inc. 401(k) Trust and Plan, as amended.
(4)	No transaction being reported on this line. Reported on a previously filed Form 3, Form 4 or Form 5.
(5)	Stock Appreciation Rights granted pursuant to the Plan in exempt transactions under Rule 16b-3. These Stock Appreciation Rights vest in four equal annual installments commencing one year after the date of grant. These Stock Appreciation Rights were granted between 2017 and 2025 and expire 10 years from the date of grant.

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