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 |
|---|---|---|---|
| ARS | Annual report to shareholders | Mar 2, 2026 | Dec 31, 2025 |
| 10-K/A | Amended annual report | Feb 23, 2026 | Dec 31, 2025 |
| 10-K | Annual report | Feb 18, 2026 | Dec 31, 2025 |
| ARS | Annual report to shareholders | Mar 3, 2025 | Dec 31, 2024 |
| 10-K | Annual report | Feb 19, 2025 | Dec 31, 2024 |
| ARS | Annual report to shareholders | Feb 28, 2024 | Dec 31, 2023 |
| 10-K | Annual report | Feb 14, 2024 | Dec 31, 2023 |
| ARS | Annual report to shareholders | Mar 1, 2023 | Dec 31, 2022 |
| 10-K | Annual report | Feb 15, 2023 | Dec 31, 2022 |
| 10-K | Annual report | Feb 16, 2022 | Dec 31, 2021 |
| 10-K | Annual report | Feb 19, 2021 | Dec 31, 2020 |
| 10-K | Annual report | Feb 20, 2020 | Dec 31, 2019 |
| 10-K | Annual report | Feb 22, 2019 | Dec 31, 2018 |
| 10-K/A | Amended annual report | Feb 22, 2018 | Dec 31, 2017 |
| 10-K | Annual report | Feb 20, 2018 | Dec 31, 2017 |
| 10-K/A | Amended annual report | May 15, 2017 | Dec 31, 2016 |
| 10-K | Annual report | Feb 22, 2017 | Dec 31, 2016 |
| 10-K | Annual report | Feb 29, 2016 | Dec 31, 2015 |
| ARS | Annual report to shareholders | Mar 16, 2015 | Dec 31, 2014 |
| 10-K | Annual report | Mar 2, 2015 | Dec 31, 2014 |
| ARS | Annual report to shareholders | Mar 18, 2014 | Dec 31, 2013 |
| ARS | Annual report to shareholders | Mar 18, 2014 | Dec 31, 2013 |
| 10-K | Annual report | Mar 3, 2014 | Dec 31, 2013 |
| ARS | Annual report to shareholders | Mar 15, 2013 | Dec 31, 2012 |
| 10-K | Annual report | Feb 27, 2013 | Dec 31, 2012 |
| ARS | Annual report to shareholders | Mar 19, 2012 | Dec 31, 2011 |
| 10-K | Annual report | Feb 29, 2012 | Dec 31, 2011 |
| 10-K | Annual report | Feb 28, 2011 | Dec 31, 2010 |
| ARS | Annual report to shareholders | Mar 15, 2010 | Dec 31, 2009 |
| 10-K | Annual report | Feb 26, 2010 | Dec 31, 2009 |
Showing 30 filings. 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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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.