RPM: Other company developments

Item 8.01. Other Events. On October 8, 2026, the Company issued a press release announcing an increase in its quarterly cash dividend. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1 . Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit Number Description 99.1 Press Release of the Company, dated October 8, 2026, announcing a dividend increase. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. RPM International Inc. (Registrant) Date October 13, 2026 /s/ Tracy D. Crandall Tracy D. Crandall Vice President, General Counsel, Chief Compliance Officer and Secretary