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 |
|---|---|---|---|
| S-3ASR | Automatic shelf registration | May 3, 2024 | — |
| S-3ASR | Automatic shelf registration | May 3, 2024 | — |
| S-8 | Employee stock plan registration | Apr 17, 2023 | — |
| S-3ASR | Automatic shelf registration | May 3, 2021 | — |
| S-3ASR | Automatic shelf registration | May 3, 2021 | — |
| 424B5 | Prospectus supplement | Nov 8, 2019 | — |
| S-3ASR | Automatic shelf registration | May 3, 2018 | — |
| S-3ASR | Automatic shelf registration | May 3, 2018 | — |
| 424B5 | Prospectus supplement | May 11, 2015 | — |
| S-8 | Employee stock plan registration | May 11, 2015 | — |
| S-3ASR | Automatic shelf registration | May 11, 2015 | — |
| S-3ASR | Automatic shelf registration | May 11, 2015 | — |
| S-8 POS | Post-effective amendment no. 2 to form s-8 | Jul 25, 2014 | — |
| S-8 POS | Post-effective amendment no. 2 to form s-8 | Jul 25, 2014 | — |
| S-8 POS | Post-effective amendment no. 2 to form s-8 | Jul 25, 2014 | — |
| 424B5 | Prospectus supplement | May 14, 2014 | — |
| S-8 | Employee stock plan registration | Apr 17, 2014 | — |
| 424B5 | Prospectus supplement | May 14, 2012 | — |
| S-8 | Employee stock plan registration | May 11, 2012 | — |
| S-3ASR | Automatic shelf registration | May 11, 2012 | — |
| S-3ASR | Automatic shelf registration | May 11, 2012 | — |
| 424B5 | Prospectus supplement | Mar 17, 2010 | — |
| 424B2 | Prospectus | Dec 2, 2009 | — |
| FWP | Free writing prospectus | Dec 1, 2009 | — |
| 424B5 | Prospectus supplement | Nov 30, 2009 | — |
| S-8 POS | Filing | Aug 28, 2009 | — |
| S-8 POS | Filing | Jul 1, 2009 | — |
| S-8 POS | Filing | Jul 1, 2009 | — |
| S-8 POS | Filing | Jul 1, 2009 | — |
| S-8 POS | Filing | Jul 1, 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.
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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.