Otter Tail Corp SEC filings OTTR
Otter Tail Corp has 878 filings in SEC EDGAR's recent list, going back to Jul 1, 2009. Its latest annual report, Form ARS, was filed on Mar 2, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 3, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Aug 12, 2026 | Aug 10, 2026 |
| 4 | Insider transaction | Aug 11, 2026 | Aug 7, 2026 |
| 144 | Notice of proposed sale | Aug 7, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 7, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 4 | Insider transaction | Apr 15, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 15, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 15, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 15, 2026 | Apr 13, 2026 |
| 3 | Initial insider ownership | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 9, 2026 | Apr 8, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 12, 2026 | Feb 10, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 9, 2026 | Feb 6, 2026 |
| 3 | Initial insider ownership | Jan 6, 2026 | Jan 1, 2026 |
| 3 | Initial insider ownership | Jan 6, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 14, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 9, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Feb 13, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 13, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 13, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 13, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 13, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 13, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 6, 2025 |
| SC 13D/A | Amended ownership over 5% (active) | Oct 3, 2024 | — |
| 4 | Insider transaction | Aug 14, 2024 | Aug 13, 2024 |
| 144 | Notice of proposed sale | Aug 13, 2024 | — |
| 4 | Insider transaction | May 28, 2024 | May 24, 2024 |
| 144 | Notice of proposed sale | May 24, 2024 | — |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Apr 9, 2024 | Apr 8, 2024 |
| 4 | Insider transaction | Mar 13, 2024 | Mar 12, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| 4 | Insider transaction | Feb 8, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 8, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 8, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 8, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 8, 2024 | Feb 6, 2024 |
| 4 | Insider transaction | Feb 8, 2024 | Feb 6, 2024 |
| 5 | Annual insider ownership | Jan 23, 2024 | Dec 31, 2023 |
| 5 | Annual insider ownership | Jan 23, 2024 | Dec 31, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2024 | — |
| 3 | Initial insider ownership | Jan 8, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Nov 20, 2023 | Nov 20, 2023 |
| 144 | Notice of proposed sale | Nov 20, 2023 | — |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| 4 | Insider transaction | Apr 19, 2023 | Apr 17, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 8, 2023 | — |
| 4 | Insider transaction | Feb 9, 2023 | Feb 7, 2023 |
| 4 | Insider transaction | Feb 9, 2023 | Feb 7, 2023 |
| 4 | Insider transaction | Feb 9, 2023 | Feb 7, 2023 |
| 4 | Insider transaction | Feb 9, 2023 | Feb 7, 2023 |
| 4 | Insider transaction | Feb 9, 2023 | Feb 7, 2023 |
| 4 | Insider transaction | Feb 9, 2023 | Feb 7, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| 4 | Insider transaction | Feb 8, 2023 | Feb 6, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 31, 2023 | — |
| 5 | Annual insider ownership | Jan 24, 2023 | Dec 31, 2022 |
| 3 | Initial insider ownership | Jan 10, 2023 | Jan 1, 2023 |
| 3 | Initial insider ownership | Jan 10, 2023 | Jan 1, 2023 |
| 4 | Insider transaction | Jan 3, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 21, 2022 |
| 4 | Insider transaction | Oct 3, 2022 | Sep 30, 2022 |
| 4 | Insider transaction | Jul 1, 2022 | Jun 30, 2022 |
| 4 | Insider transaction | Jul 1, 2022 | Jun 30, 2022 |
| 4 | Insider transaction | Apr 13, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Apr 1, 2022 | Mar 31, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| 4 | Insider transaction | Feb 9, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 9, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 9, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 8, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 8, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 8, 2022 | Feb 7, 2022 |
| 4 | Insider transaction | Feb 8, 2022 | Feb 6, 2022 |
| 4 | Insider transaction | Feb 8, 2022 | Feb 6, 2022 |
| 4 | Insider transaction | Feb 8, 2022 | Feb 6, 2022 |
| 4 | Insider transaction | Feb 7, 2022 | Feb 6, 2022 |
| 4 | Insider transaction | Feb 7, 2022 | Feb 6, 2022 |
| 4 | Insider transaction | Feb 7, 2022 | Feb 6, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 3, 2022 | — |
| 5 | Annual insider ownership | Jan 24, 2022 | Dec 31, 2021 |
| 5 | Annual insider ownership | Jan 24, 2022 | Dec 31, 2021 |
| 3 | Initial insider ownership | Jan 4, 2022 | Jan 1, 2022 |
| 4 | Insider transaction | Dec 7, 2021 | Dec 6, 2021 |
| 4 | Insider transaction | Nov 18, 2021 | Nov 17, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | May 10, 2021 | — |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 13, 2021 | Apr 12, 2021 |
| 4 | Insider transaction | Apr 9, 2021 | Apr 8, 2021 |
| 4 | Insider transaction | Feb 12, 2021 | Feb 10, 2021 |
| 4 | Insider transaction | Feb 12, 2021 | Feb 10, 2021 |
| 4 | Insider transaction | Feb 12, 2021 | Feb 10, 2021 |
| 4 | Insider transaction | Feb 12, 2021 | Feb 10, 2021 |
| 4 | Insider transaction | Feb 12, 2021 | Feb 10, 2021 |
| 4 | Insider transaction | Feb 12, 2021 | Feb 10, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2021 | — |
| 4 | Insider transaction | Feb 9, 2021 | Feb 6, 2021 |
| 4 | Insider transaction | Feb 9, 2021 | Feb 6, 2021 |
| 4 | Insider transaction | Feb 9, 2021 | Feb 6, 2021 |
| 4 | Insider transaction | Feb 9, 2021 | Feb 6, 2021 |
| 4 | Insider transaction | Feb 9, 2021 | Feb 6, 2021 |
| 4 | Insider transaction | Feb 9, 2021 | Feb 6, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 29, 2021 | — |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 22, 2020 | Apr 20, 2020 |
| 4 | Insider transaction | Apr 10, 2020 | Apr 8, 2020 |
| 4 | Insider transaction | Mar 16, 2020 | Mar 12, 2020 |
| SC 13D/A | Amended ownership over 5% (active) | Feb 24, 2020 | — |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| 4 | Insider transaction | Feb 14, 2020 | Feb 12, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2020 | — |
| 4 | Insider transaction | Feb 10, 2020 | Feb 6, 2020 |
| 4 | Insider transaction | Feb 10, 2020 | Feb 6, 2020 |
| 4 | Insider transaction | Feb 10, 2020 | Feb 6, 2020 |
| 4 | Insider transaction | Feb 10, 2020 | Feb 6, 2020 |
| 4 | Insider transaction | Feb 10, 2020 | Feb 6, 2020 |
| 4 | Insider transaction | Feb 10, 2020 | Feb 6, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2020 | — |
| 4 | Insider transaction | Nov 21, 2019 | Nov 20, 2019 |
| 4 | Insider transaction | Apr 10, 2019 | Apr 8, 2019 |
| 4 | Insider transaction | Apr 10, 2019 | Apr 8, 2019 |
| 4 | Insider transaction | Apr 10, 2019 | Apr 8, 2019 |
| 4 | Insider transaction | Apr 10, 2019 | Apr 8, 2019 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Electric Services (SIC 4911)
- Listed as
- OTTR (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- MN
- Headquarters
- Fergus Falls, MN
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1466593
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.