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)     April 29, 2026      TENNANT COMPANY (Exact name of registrant as specified in its charter)   Minnesota 1-16191 41-0572550 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.)   10400 Clean Street Eden Prairie , Minnesota 55344 (Address of principal executive offices) (Zip Code)   Registrant’s telephone number, including area code ( 763 )  540-1200   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 ( see General Instruction A.2. below):   ¨ Written communications 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, par value $0.375 per share   TNC   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.   Tennant Company (the “Company”) held the 2026 Annual Meeting for purposes of electing three directors, ratifying the appointment of Deloitte & Touche LLP as the independent registered public accounting firm of the Company for the year ending December 31, 2026, and providing advisory approval on executive compensation. Results of shareholder voting on these matters were as follows:       For   Against   Abstain   Broker Non-Vote 1. Each of the following three Class I directors was elected for a three-year term expiring in 2029;                 Carol S. Eicher   15,293,111   429,575   343,863   691,034 Maria C. Green   15,271,510   602,556   192,483   691,034 Donal L. Mulligan   15,278,918   443,555   344,076   691,034       For   Against   Abstain   Broker Non-Vote 2. The appointment of Deloitte & Touche LLP as the independent registered public accounting firm of the Company for the year ending December 31, 2026 was ratified.   16,681,022   58,314   18,247           For   Against   Abstain   Broker Non-Vote 3. Advisory approval of executive compensation was received.   15,745,471   291,577   29,501   691,034   There were 18,007,425 shares of common stock entitled to vote at the 2026 Annual Meeting, and a total of 16,757,583 (93.05%) shares were represented at the meeting.   2     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.     Tennant Company       Date: May 1, 2026 By: /s/ Kristin A. Erickson     Kristin A. Erickson     Senior Vice President, General Counsel and Corporate Secretary   3