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 May 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File No. 1-14187 RPM INTERNATIONAL INC. (Exact Name of Registrant as Specified in its Charter) Delaware 02-0642224 (State or Other Jurisdiction of (IRS Employer Inc ...