TENNANT CO

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Material

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Soliciting Material under §240.14a-12

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TENNANT COMPANY

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(Name of Registrant as Specified In Its Charter)

N/A

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

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No fee required

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Fee paid previously with preliminary materials

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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Tennant Company

10400 Clean Street

Eden Prairie, Minnesota 55344

March 18, 2026

Dear Shareholder,

Tennant Company’s 2026 Annual Meeting of Shareholders will be held on Wednesday, April 29, 2026, at 10:30 a.m. Central Time. The Annual Meeting will be a completely virtual meeting of shareholders. You may attend the meeting and vote your shares electronically during the meeting via the Internet by visiting www.virtualshareholdermeeting.com/TNC2026.

The attached Notice of Annual Meeting and Proxy Statement describe the business to be conducted at the meeting. We have chosen to provide access to our proxy materials over the Internet under the Securities and Exchange Commission’s “notice and access” rules. We believe that providing our proxy materials over the Internet reduces the environmental impact of our meeting without limiting our shareholders’ access to important information about Tennant.

Whether or not you plan on joining the meeting, it is important that your shares be represented and voted at the meeting. We encourage you to read the Proxy Statement and vote your shares, as instructed in the Notice of Internet Availability of Proxy Materials, as soon as possible. You may also follow the instructions in the Notice of Internet Availability of Proxy Materials to vote by telephone or request a paper proxy card, which will include a reply envelope, to submit your vote by mail.

We appreciate your continued confidence in Tennant and look forward to you joining the virtual meeting.

Sincerely,

Kristin A. Erickson

Senior Vice President, Chief Human Resources Officer, General Counsel and Corporate Secretary