Executive Change · Reg FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 24, 2024 DONALDSON COMPANY, INC. (Exact name of registrant as specified in its charter)                  Delaware 1-7891 41-0222640 (State of Incorporation) (Commission file number) (I.R.S. Employer Identification Number) 1400 West 94 th Street Minneapolis , MN 55431 (Address of principal executive offices) ( 952 ) 887-3131 (Registrant’s telephone number, including area code) Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre Commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre Commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, $5.00 par value DCI New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On June 24, 2024, Donaldson Company, Inc. issued a press release announcing the following leadership role changes effective August 1, 2024: Andrew C. Dahlgren, currently President, Life Sciences, is appointed to President, Mobile Solutions Richard B. Lewis, currently President, Mobile Solutions, is appointed to President, Life Sciences Item 7.01 Regulation FD Disclosure. A copy of the press release that discusses these matters is being furnished herewith as Exhibit 99.1. The information in 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 filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. 99.1     Press Release, dated June 2 4 , 2024 , issued by Donaldson Company, Inc. 104    Cover page interactive data file (formatted as inline XBRL) SIGNATURES 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.     DONALDSON COMPANY, INC.         Date: June 24, 2024   By:   /s/ Amy C. Becker         Amy C. Becker Chief Legal Officer and Corporate Secretary