Shareholder Vote

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): November 21, 2025 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 5.07. Submission of Matters to a Vote of Security Holders. Donaldson Company, Inc. (the “Company”) held its 2025 Annual Meeting of Stockholders on November 21, 2025. The Company’s stockholders voted on each of the proposals detailed in the Company’s 2025 Proxy Statement. Item 1 The Company’s stockholders elected four individuals to the Board of Directors as set forth below: FOR WITHHELD BROKER NON-VOTE Douglas A. Milroy 91,803,644 5,949,474 9,705,334 Richard M. Olson 90,038,371 7,714,747 9,705,334 Daniel P. Shine 97,348,024 405,094 9,705,334 Jacinth C. Smiley 96,991,970 761,148 9,705,334 Item 2 The Company’s stockholders approved a non-binding advisory vote on the compensation of the Company’s named executive officers as set forth below: FOR AGAINST ABSTAIN BROKER NON-VOTE 90,657,554 6,173,524 922,040 9,705,334 Item 3 The Company’s stockholders ratified the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm to audit the Company’s financial statements for the fiscal year ending July 31, 2026 as set forth below: FOR AGAINST ABSTAIN 104,131,883 2,966,465 360,104 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: November 24, 2025   By:   /s/ Amy C. Becker         Amy C. Becker Chief Legal Officer and Corporate Secretary