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 .

Results of Operations and Financial Condition. On October 6, 2026, RPM International Inc. (the “Company”) issued a press release announcing its first quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1 . Financial information supplemental to the press release is furnished with this Current Report on Form 8-K as Exhibit 99.2 .

Results of Operations and Financial Condition. On July 22, 2026, the Company issued a press release announcing its year-end results for fiscal 2026, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1 . Financial information supplemental to the press release is furnished with this Current Report on Form 8-K as Exhibit 99.2 .

President and Chief Operating Officer — David C. Dennsteadt: David C. Dennsteadt was promoted to President and Chief Operating Officer.

Other Events. On July 22, 2026, the Company announced a $700.0 million increase to the Company’s existing common stock repurchase program (the “Repurchase Program”). Prior to this increase, the maximum dollar amount that may have been repurchased under the Repurchase Program was approximately $140.0 million at February 28, 2026, as previously disclosed. Under its Repurchase Program, the Company may repurchase shares from time to time in the open market or in private transactions at various ti…

Entry into a Material Definitive Agreement Amendment of Accounts Receivable Securitization Facility On May 27, 2026, RPM International Inc. (the “Company”) amended its existing $300.0 million accounts receivable securitization facility (the “A/R Facility”) by entering into (i) Amendment No. 11 to Amended and Restated Receivables Purchase Agreement, dated as of May 27, 2026 (the “RPA Amendment”), among the Company, RPM Funding Corporation, a special purpose entity (the “SPE”) whose voting inte…

Project Management Officer — Timothy R. Kinser: Timothy R. Kinser resigned from his position as Vice President – Operations and was internally promoted to Project Management Officer of RPM Enterprises, Inc.

Director — Thomas C. Gentile, III: Appointment of Thomas C. Gentile, III to the Board of Directors.

Results of Operations and Financial Condition. On April 8, 2026, the Company issued a press release announcing its third quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

Entry into a Material Definitive Agreement. Amendment to Revolving Credit Facility On February 27, 2026, RPM International Inc. (the “Company”) and certain of its subsidiaries amended the Company’s revolving credit facility by entering into a Seventh Amendment to Credit Agreement (the “Credit Agreement Amendment”) with the lenders named therein (the “Revolving Credit Facility Lenders”) and PNC Bank, National Association, as administrative agent for the Revolving Credit Facility Lenders, which…

Results of Operations and Financial Condition. On January 8, 2026, the Company issued a press release announcing its second quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

Other Events. On October 2, 2025, 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 99.2 .

Executive Vice President — David C. Dennsteadt: David C. Dennsteadt was promoted to Executive Vice President, overseeing corporate administrative functions.

Results of Operations and Financial Condition. On October 1, 2025, RPM International Inc. (the “Company”) issued a press release announcing its first quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1 .

Results of Operations and Financial Condition. On July 24, 2025, the Company issued a press release announcing its year-end results for fiscal 2025, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

Entry into a Material Definitive Agreement. Amendment and Extension of Accounts Receivable Securitization Facility On April 30, 2025, RPM International Inc. (the “Company”) amended and extended its existing accounts receivable securitization facility (the “A/R Facility”) by entering into Amendment No. 10 to Amended and Restated Receivables Purchase Agreement, dated as of April 30, 2025 (the “RPA Amendment”), among the Company, RPM Funding Corporation, a special purpose entity (the “SPE”) whos…

Results of Operations and Financial Condition. On April 8, 2025, the Company issued a press release announcing its third quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

Director — Craig S. Morford, Christopher L. Mapes, Julie A. Beck: The filing discloses the appointment of three new directors to the Board, which is a standard governance event and not a departure of a sitting executive.

Results of Operations and Financial Condition. On January 7, 2025, the Company issued a press release announcing its second quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

General Counsel — Edward W. Moore: The filing describes an orderly retirement of the General Counsel with an immediate internal promotion of a successor, indicating a planned succession rather than a sudden loss of executive leadership.

Other Events. On October 3, 2024, 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 99.2 .

Results of Operations and Financial Condition. On October 2, 2024, the Company issued a press release announcing its first quarter results, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

Other Events. As previously disclosed in the Annual Report on Form 10-K, dated July 25, 2024, of RPM International Inc. (the “Company”), one of the Company’s subsidiaries in its Consumer reportable segment has been the subject of a lawsuit filed in the United States District Court for the District of Oregon in which a former supplier of that subsidiary alleged that the subsidiary breached certain contractual obligations, misappropriated trade secrets, and committed fraud. The Company’s subsid…

Results of Operations and Financial Condition. On July 25, 2024, the Company issued a press release announcing its year-end results for fiscal 2024, which provided detail not included in previously issued reports. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

Director — Kirkland B. Andrews: A director is voluntarily resigning to take a new executive role elsewhere, with no dispute and a planned effective date in the future.