OTTROtter Tail Corporation

1. Sep 1, 2026On August 28, 2026, Thomas J. Webb notified Otter Tail Corporation (the “Company”) of his intention to not stand for reelection and instead retire from the Company’s Board of Directors effective at the conclusion of his current term, which expires at the time of the 2027 Annual Meeting of Shareholders, in accordance …Director or officer change · Form 8-K
2. Aug 4, 2026Otter Tail Corporation Announces Second Quarter Results and Updates Annual Earnings Guidance.Earnings release · press release
3. Jun 18, 2026As previously reported, in 2024, putative federal class action lawsuits alleging violations of the antitrust laws were filed against Otter Tail Corporation and two subsidiaries (together, the “Company”), along with more than twenty other PVC pipe manufacturers.Material agreement entered · Form 8-K
4. Jun 5, 2026As previously reported in a Form 8-K filed by Otter Tail Corporation on March 23, 2026 (the “March 8-K”), Otter Tail Power Company ("OTP”), a wholly owned subsidiary of Otter Tail Corporation, entered into a Note Purchase Agreement (the “Note Purchase Agreement”) on March 19, 2026, with the purchasers named therein …New debt or off-balance-sheet obligation · Form 8-K
5. May 29, 2026As previously reported, in 2024, putative federal class action lawsuits alleging violations of the antitrust laws were filed against Otter Tail Corporation and two subsidiaries (together, the “Company”), along with more than twenty other PVC pipe manufacturers.Material agreement entered · Form 8-K
6. May 15, 2026Integrated Resource Plan On May 15, 2026, Otter Tail Power Company (OTP), a wholly owned subsidiary of Otter Tail Corporation, filed its 2026 Integrated Resource Plan (2026 IRP) with the Minnesota Public Utilities Commission (MPUC)Other event · Form 8-K
7. May 5, 2026Otter Tail Corporation Announces First Quarter Earnings and Affirms 2026 EPS Guidance.Earnings release · press release
8. Apr 14, 2026Appointment of President of Otter Tail Corporation On April 13, 2026, the Board of Directors of Otter Tail Corporation (Otter Tail or the Company) elected Tim Rogelstad as President of the Company.Director or officer change · Form 8-K
9. Mar 23, 2026On March 19, 2026, Otter Tail Power Company (the “Company”), a wholly owned subsidiary of Otter Tail Corporation (“OTC”), entered into a Note Purchase Agreement (the “Note Purchase Agreement”) with the purchasers named therein (the “Purchasers”), pursuant to which the Company issued to the Purchasers, in a private …Material agreement entered · Form 8-K
10. Feb 17, 2026Otter Tail Corporation Announces Annual Earnings and Initiates 2026 Earnings Guidance.Earnings release · press release
11. Dec 18, 2025On December 16, 2025, Steven L. Fritze notified Otter Tail Corporation (the “Company”) of his intention to retire from the Company’s Board of Directors effective at the time of the 2026 Annual Meeting of Shareholders, having reached retirement age in accordance with the Corporation’s director retirement policy.Director or officer change · Form 8-K

Quoted from SEC EDGAR filings. A current report is filed within four business days of the event it describes.