Otter Tail (NASDAQ: OTTR) furnishes Q3 2025 earnings release in 8-K filing

Rhea-AI Filing Summary

Otter Tail Corporation filed a current report to share that it issued a press release announcing its consolidated financial results for the third quarter of 2025. The press release, dated November 3, 2025, is included as Exhibit 99.1 to this report.

The filing clarifies that the earnings press release and related information are furnished, not filed, under securities laws, meaning they are not automatically incorporated into other securities filings unless specifically referenced.

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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 3, 2025

OTTER TAIL CORPORATION

(Exact name of registrant as specified in its charter)

Minnesota (State or other jurisdiction of incorporation or organization) 0-53713 (Commission File Number) 27-0383995 (I.R.S. Employer Identification No.)

215 South Cascade Street, P.O. Box 496, Fergus Falls, MN 56538-0496

(Address of principal executive offices, including zip code)

(866) 410-8780

(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 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 Securities Exchange Act of 1934:

Title of each class			Trading Symbol(s)			Name of each exchange on which registered
Common Shares, par value $5.00 per share			OTTR			The Nasdaq Stock Market LLC

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.  ☐

Item 2.02    Results of Operations and Financial Condition

On November 3, 2025 Otter Tail Corporation issued a press release announcing its consolidated financial results for the third quarter of 2025. A copy of the press release is furnished herewith as Exhibit 99.1.

The information in this Item 2.02 (including Exhibit 99.1 attached hereto) shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, 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 issued November 3, 2025.
			104			Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

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.

			OTTER TAIL CORPORATION
Date: November 4, 2025			By:			/s/ Todd R. Wahlund
						Todd R. Wahlund
						Chief Financial Officer

FAQ

What did Otter Tail Corporation (OTTR) report in this 8-K filing?

Otter Tail Corporation reported that it issued a press release announcing its consolidated financial results for the third quarter of 2025. The press release is provided as Exhibit 99.1 and is furnished under Item 2.02 regarding results of operations and financial condition.

What period do the Otter Tail Corporation (OTTR) results in this 8-K cover?

The results relate to Otter Tail Corporation’s consolidated financial performance for the third quarter of 2025. Specific revenue, earnings, or cash flow figures are contained in the accompanying press release, which is furnished as Exhibit 99.1 to the current report.

How is the Otter Tail Corporation (OTTR) earnings press release treated legally in this 8-K?

The earnings press release and Item 2.02 information are treated as furnished, not filed, under the Securities Exchange Act of 1934. They are not incorporated into other Securities Act or Exchange Act filings unless another document specifically includes them by reference.

Which exhibits are included with this Otter Tail Corporation (OTTR) 8-K?

The 8-K includes Exhibit 99.1, which is the press release issued November 3, 2025, and Exhibit 104, the cover page interactive data file embedded within the Inline XBRL document. These exhibits provide the detailed earnings information and related structured data.

Who signed the Otter Tail Corporation (OTTR) 8-K covering Q3 2025 results?

The current report was signed on behalf of Otter Tail Corporation by Todd R. Wahlund, the company’s Chief Financial Officer. His electronic signature appears on the document dated November 4, 2025, satisfying the company’s formal reporting obligations under the Exchange Act.

On what date did Otter Tail Corporation (OTTR) issue the Q3 2025 earnings press release?

Otter Tail Corporation issued the press release announcing its consolidated financial results for the third quarter of 2025 on November 3, 2025. That press release is attached to the report as Exhibit 99.1 and is referenced under Item 2.02.