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Otter Tail Corp — Investor Relations & Filings

Ticker · OTTR ISIN · US6896481032 LEI · 549300HHVBQRQUVKKD91 US Electricity, gas, steam and air conditioning supply
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Filings indexed 849 across all filing types
Latest filing 2026-06-05 Capital/Financing Update
Country US United States of America
Listing US OTTR

About Otter Tail Corp

https://www.ottertail.com/

Otter Tail Corporation is a holding company operating through a two-platform business model. Its Electric platform, through Otter Tail Power Company, provides electricity and energy services to residential, commercial, and industrial customers across parts of Minnesota, North Dakota, and South Dakota. The Manufacturing platform consists of several companies specializing in metal fabrication, the production of custom plastic parts, and PVC pipe for various markets. The corporation focuses on a strategy of combining a high-performing, low-cost electric utility with disciplined manufacturing operations.

Recent filings

Filing Released Lang Actions
8-K
Capital/Financing Update Classification · 95% confidence The document is a Form 8-K current report disclosing the creation of a direct financial obligation under a Note Purchase Agreement and the issuance of $70 million of senior unsecured notes to fund capital expenditures, refinance debt, and for general corporate purposes. This clearly involves capital raising and financing activity rather than an annual or interim report, earnings release, or management discussion. Therefore, it is best classified as a Capital/Financing Update.
2026-06-05 English
SD
Regulatory Filings Classification · 90% confidence The document is an SEC Form SD (“Specialized Disclosure Report”) for conflict minerals covering January 1 to December 31, 2025. It is a mandatory specialized disclosure filing rather than an annual, quarterly, or proxy report, and contains no financial statements or presentations. There is no dedicated category for conflict minerals reports in the taxonomy, so it falls under the general regulatory filings category.
2026-05-29 English
8-K
Legal Proceedings Report Classification · 92% confidence The document is a Form 8-K “Current Report” filed by Otter Tail Corporation under the Securities Exchange Act, describing Item 1.01 Entry into Material Definitive Agreement relating to settlement agreements in antitrust class action litigation. It provides an update on significant legal proceedings and settlement terms in the PVC Pipe Antitrust Litigation. This fits the definition of a Legal Proceedings Report (LTR): updates on significant lawsuits or regulatory actions.
2026-05-29 English
8-K
Regulatory Filings Classification · 85% confidence The document is a Current Report on Form 8-K (Item 8.01 Other Events) filed with the SEC, notifying investors that Otter Tail Power Company filed its 2026 Integrated Resource Plan with the Minnesota Public Utilities Commission. It does not contain financial statements, earnings data, management changes, or proxy materials, but rather serves as a regulatory notice. Under the classification scheme, this falls under general regulatory announcements (Regulatory Filings).
2026-05-15 English
10-Q - Otter Tail Corp (0001466593) (Filer)
Interim / Quarterly Report Q1 2026
2026-05-06 English
8-K - Otter Tail Corp (0001466593) (Filer)
Regulatory Filings Classification · 86% confidence The document is a Form 8-K “Current Report” under the Exchange Act, furnishing a press release of first quarter results (Item 2.02). It does not itself contain the full earnings release or financial statements, but is a regulatory announcement filing. This does not fit categories like ER or IR, but is a general SEC filing, so it falls under Regulatory Filings (RNS).
2026-05-05 English

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