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(Exact name of registrant as specified in its charter)

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(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:

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Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

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.  ☐

Otter Tail Corporation (the “Company”) held its Annual Shareholder Meeting on April 8, 2024, in a virtual format. A total of 41,776,900 shares of the Company’s common stock were entitled to vote as of the close of business on February 8, 2024, the record date for the Annual Meeting, of which 34,351,448 were voted in person or by proxy at the Annual Meeting, with virtual attendance constituting in person attendance at the Annual Meeting. The matters voted upon and approved by the Company’s shareholders were:

1.the election of three members to the Board of Directors;

2.the approval, in a non-binding advisory vote, of the compensation provided to the Named Executive Officers as described in the Proxy Statement; and

3.the ratification of the appointment of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the year 2024.

The following is a summary of the voting results for each matter presented to the shareholders:

All three directors were elected, or re-elected, to serve three-year terms expiring at the time of the 2027 Annual Shareholder Meeting and until their successors are duly elected and qualified.

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.