Results of Operations and Financial Condition. On August 26, 2026, Donaldson Company, Inc. issued a press release announcing its results of operations for the quarter and fiscal year ended July 31, 2026. A copy of the press release is furnished herewith as Exhibit 99.1. The information in the Form 8-K and the Exhibit attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by refe…

Director — Douglas A. Milroy: Mr. Milroy resigned from the Board of Directors.

Results of Operations and Financial Condition. On June 2, 2026, Donaldson Company, Inc. (the “Company”) issued a press release announcing its results of operations for the quarter ended April 30, 2026. A copy of the press release is furnished herewith as Exhibit 99.1.

Entry into a Material Definitive Agreement. On April 8, 2026, Donaldson Company, Inc. (the “Company”) entered into a Term Loan Credit Agreement (the “Agreement”), among the Company, certain lenders from time to time party to the Agreement (the “Lenders”), and Wells Fargo Bank, National Association, as administrative agent for the Lenders. The Agreement creates a new three-year committed, unsecured, delayed draw term loan credit facility in the amount of $400 million available to the Company (…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. As described under

Results of Operations and Financial Condition. On February 26, 2026, Donaldson Company, Inc. (the “Company”) issued a press release announcing its results of operations for the quarter ended January 31, 2026. A copy of the press release is furnished herewith as Exhibit 99.1.

of this Form 8-K and Exhibit 99.1 attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing. Forward-Looking Statements Statements in this communication regarding future events and expectations, such as forecasts, plans, trends and pro…

Entry into a Material Definitive Agreement. On January 31, 2026, Donaldson Company, Inc. (the “ Company ”) entered into a Securities Purchase Agreement (the “ Purchase Agreement ”) with Facet Group Holdings II LLC, a Delaware limited liability company (“ U.S. Seller ”), Facet Holdings II B.V., an entity organized and existing under the laws of the Netherlands (“ OUS Seller ” and, together with U.S. Seller, “ Sellers ” and each, a “ Seller ”). Pursuant to the Purchase Agreement, on the terms a…

President and Chief Executive Officer — Richard B. Lewis: Richard B. Lewis was promoted to President and Chief Executive Officer, succeeding Tod E. Carpenter who is retiring.

Results of Operations and Financial Condition. On December 4, 2025, Donaldson Company, Inc. (the “Company”) issued a press release announcing its results of operations for the quarter ended October 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1.

Results of Operations and Financial Condition. On August 27, 2025, Donaldson Company, Inc. issued a press release announcing its results of operations for the quarter and fiscal year ended July 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1. The information in the Form 8-K and the Exhibit attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by refe…

Entry into a Material Definitive Agreement. On June 12, 2025, Donaldson Company, Inc. (the “Company”) entered into a Second Amendment to Credit Agreement (the “Second Amendment”), among the Company, the lenders party thereto, Wells Fargo Bank, National Association, as administrative agent for the lenders and as an issuer of letters of credit, and U.S. Bank National Association, as an issuer of letters of credit, pursuant to which the parties amended the Company’s existing Credit Agreement, da…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. As described under

COO — Richard B. Lewis: The filing announces the internal promotion of a long-tenured executive from President, Life Sciences to Chief Operating Officer, which is a succession event rather than a departure.

Results of Operations and Financial Condition. On June 3, 2025, Donaldson Company, Inc. (the “Company”) issued a press release announcing its results of operations for the quarter ended April 30, 2025. A copy of the press release is furnished herewith as Exhibit 99.1.

President, Enterprise Operations and Supply Chain — Thomas R. Scalf: The filing discloses the planned retirement of a senior executive with a structured consulting arrangement to ensure a smooth transition, indicating an orderly succession rather than a sudden loss.

Results of Operations and Financial Condition. On February 27, 2025, Donaldson Company, Inc. issued a press release announcing its results of operations for the quarter ended January 31, 2025. A copy of the press release is furnished herewith as Exhibit 99.1. The information in the Form 8-K and the Exhibit attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by reference in an…

Results of Operations and Financial Condition. On December 3, 2024, Donaldson Company, Inc. issued a press release announcing its results of operations for the quarter ended October 31, 2024. A copy of the press release is furnished herewith as Exhibit 99.1. The information in the Form 8-K and the Exhibit attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by reference in any…

CFO — Scott Robinson: The CFO is retiring with a named internal successor (Brad Pogalz) already appointed, indicating an orderly succession rather than a sudden loss of leadership.

Results of Operations and Financial Condition. On August 28, 2024, Donaldson Company, Inc. issued a press release announcing its results of operations for the quarter and fiscal year ended July 31, 2024. A copy of the press release is furnished herewith as Exhibit 99.1. The information in the Form 8-K and the Exhibit attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by refe…

President — Andrew C. Dahlgren: The filing discloses a lateral swap of two senior division presidents, which is an internal reorganization rather than a departure or new hire.

Results of Operations and Financial Condition. On June 4, 2024, Donaldson Company, Inc. issued a press release announcing its results of operations for the quarter ended April 30, 2024. A copy of the press release is furnished herewith as Exhibit 99.1. The information in the Form 8-K and the Exhibit attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by reference in any filin…