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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 4, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2026 | Nov 2, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 1, 2026 | Aug 28, 2026 |
| 10-Q | Quarterly report | Aug 5, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2026 | Aug 3, 2026 |
| 8-K |
Current report
Material agreement
|
Jun 18, 2026 | Jun 17, 2026 |
| 8-K |
Current report
New debt
|
Jun 5, 2026 | Jun 4, 2026 |
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| 8-K |
Current report
Material agreement
|
May 29, 2026 | May 28, 2026 |
| 8-K |
Current report
Other events
|
May 15, 2026 | May 15, 2026 |
| 10-Q | Quarterly report | May 6, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 5, 2026 | May 4, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Apr 15, 2026 | Apr 13, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Apr 14, 2026 | Apr 13, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 23, 2026 | Mar 19, 2026 |
| ARS | Annual report to shareholders | Mar 2, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Mar 2, 2026 | — |
| DEF 14A | Proxy statement | Mar 2, 2026 | Apr 13, 2026 |
| 10-K/A | Amended annual report | Feb 23, 2026 | Dec 31, 2025 |
| PRE 14A | Preliminary proxy statement | Feb 18, 2026 | Apr 13, 2026 |
| 10-K | Annual report | Feb 18, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 17, 2026 | Feb 16, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 18, 2025 | Dec 16, 2025 |
| 10-Q | Quarterly report | Nov 5, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2025 | Nov 3, 2025 |
| 10-Q | Quarterly report | Aug 6, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2025 | Aug 4, 2025 |
| 8-K |
Current report
New debt
|
Jun 6, 2025 | Jun 5, 2025 |
| 8-K |
Current report
Other events
|
Jun 5, 2025 | Jun 4, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 30, 2025 | — |
| 10-Q | Quarterly report | May 7, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 6, 2025 | May 5, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Apr 17, 2025 | Apr 14, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 31, 2025 | Mar 27, 2025 |
| ARS | Annual report to shareholders | Mar 3, 2025 | Dec 31, 2024 |
| DEF 14A | Proxy statement | Mar 3, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 3, 2025 | — |
| 10-K | Annual report | Feb 19, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 18, 2025 | Feb 17, 2025 |
| 8-K |
Current report
Other events
|
Dec 31, 2024 | Dec 30, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 16, 2024 | Dec 11, 2024 |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2024 | Nov 4, 2024 |
| 10-Q | Quarterly report | Aug 7, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2024 | Aug 5, 2024 |
| 8-K |
Current report
Other events
|
Jun 5, 2024 | May 30, 2024 |
| SD | Specialized disclosure (conflict minerals) | May 24, 2024 | — |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 7, 2024 | May 6, 2024 |
| S-3ASR | Automatic shelf registration | May 3, 2024 | — |
| S-3ASR | Automatic shelf registration | May 3, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
Apr 10, 2024 | Apr 8, 2024 |
| 8-K |
Current report
Other events
|
Apr 5, 2024 | Apr 2, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 2, 2024 | Mar 28, 2024 |
| DEFA14A | Additional proxy material | Feb 28, 2024 | — |
| DEF 14A | Proxy statement | Feb 28, 2024 | Dec 31, 2023 |
| ARS | Annual report to shareholders | Feb 28, 2024 | Dec 31, 2023 |
| 10-K | Annual report | Feb 14, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 13, 2024 | Feb 12, 2024 |
| 8-K |
Current report
Officer or director change
|
Jan 29, 2024 | Jan 26, 2024 |
| 8-K |
Current report
Other events
|
Dec 21, 2023 | Dec 15, 2023 |
| 10-Q | Quarterly report | Nov 3, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2023 | Oct 30, 2023 |
| 8-K |
Current report
Officer or director change
|
Oct 4, 2023 | Oct 2, 2023 |
| 10-Q | Quarterly report | Aug 2, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 1, 2023 | Jul 31, 2023 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Jun 20, 2023 | Apr 16, 2023 |
| SD | Specialized disclosure (conflict minerals) | May 25, 2023 | — |
| 10-Q | Quarterly report | May 3, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 2, 2023 | May 1, 2023 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Apr 19, 2023 | Apr 16, 2023 |
| S-8 | Employee stock plan registration | Apr 17, 2023 | — |
| 8-K |
Current report
Other events
|
Mar 31, 2023 | Mar 31, 2023 |
| DEFA14A | Additional proxy material | Mar 7, 2023 | — |
| DEFR14A | Filing | Mar 7, 2023 | — |
| DEF 14A | Proxy statement | Mar 1, 2023 | — |
| ARS | Annual report to shareholders | Mar 1, 2023 | Dec 31, 2022 |
| 10-K | Annual report | Feb 15, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 14, 2023 | Feb 13, 2023 |
| 8-K |
Current report
Officer or director change
|
Dec 22, 2022 | Dec 21, 2022 |
| 10-Q | Quarterly report | Nov 2, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Material agreement, Results of operations, New debt
|
Nov 1, 2022 | Oct 31, 2022 |
| 8-K |
Current report
Other events
|
Oct 19, 2022 | Oct 14, 2022 |
| 8-K |
Current report
Officer or director change
|
Sep 23, 2022 | Sep 21, 2022 |
| 10-Q | Quarterly report | Aug 3, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2022 | Aug 1, 2022 |
| SD | Specialized disclosure (conflict minerals) | May 27, 2022 | — |
| 8-K |
Current report
New debt
|
May 23, 2022 | May 20, 2022 |
| 10-Q | Quarterly report | May 4, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 3, 2022 | May 2, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Apr 14, 2022 | Apr 11, 2022 |
| DEF 14A | Proxy statement | Mar 2, 2022 | Dec 31, 2021 |
| 10-K | Annual report | Feb 16, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 15, 2022 | Feb 14, 2022 |
| 8-K |
Current report
Officer or director change
|
Dec 15, 2021 | Dec 14, 2021 |
| 8-K |
Current report
New debt
|
Dec 1, 2021 | Nov 29, 2021 |
| 10-Q | Quarterly report | Nov 3, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2021 | Nov 1, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 4, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Other events
|
Sep 2, 2021 | Sep 1, 2021 |
| 10-Q | Quarterly report | Aug 6, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2021 | Aug 2, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 14, 2021 | Jun 10, 2021 |
| SD | Specialized disclosure (conflict minerals) | May 28, 2021 | — |
| 10-Q | Quarterly report | May 7, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
May 4, 2021 | May 3, 2021 |
| S-3ASR | Automatic shelf registration | May 3, 2021 | — |
| S-3ASR | Automatic shelf registration | May 3, 2021 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Apr 14, 2021 | Apr 12, 2021 |
| DEF 14A | Proxy statement | Mar 3, 2021 | Dec 31, 2020 |
| 10-K | Annual report | Feb 19, 2021 | Dec 31, 2020 |
| PRE 14A | Preliminary proxy statement | Feb 17, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 16, 2021 | Feb 15, 2021 |
| 10-Q | Quarterly report | Nov 6, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2020 | Nov 2, 2020 |
| 8-K |
Current report
Other events
|
Nov 2, 2020 | Nov 2, 2020 |
| 8-K |
Current report
New debt
|
Aug 20, 2020 | Aug 20, 2020 |
| 10-Q | Quarterly report | Aug 7, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2020 | Aug 3, 2020 |
| SD | Specialized disclosure (conflict minerals) | May 29, 2020 | — |
| 10-Q | Quarterly report | May 8, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations, Officer or director change
|
May 6, 2020 | May 5, 2020 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Apr 22, 2020 | Apr 20, 2020 |
| DEFA14A | Additional proxy material | Mar 20, 2020 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Other events
|
Mar 20, 2020 | Mar 20, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 17, 2020 | Mar 17, 2020 |
| DEF 14A | Proxy statement | Mar 9, 2020 | Apr 20, 2020 |
| 8-K |
Current report
New debt
|
Feb 26, 2020 | Feb 25, 2020 |
| 10-K | Annual report | Feb 20, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations
|
Feb 18, 2020 | Feb 17, 2020 |
| 8-K |
Current report
Officer or director change
|
Dec 27, 2019 | Dec 26, 2019 |
| 8-K |
Current report
Material agreement
|
Nov 8, 2019 | Nov 8, 2019 |
| 424B5 | Prospectus supplement | Nov 8, 2019 | — |
| 10-Q | Quarterly report | Nov 8, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 5, 2019 | Oct 31, 2019 |
| 8-K |
Current report
New debt
|
Oct 11, 2019 | Oct 10, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 16, 2019 | Sep 12, 2019 |
| 10-Q | Quarterly report | Aug 9, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2019 | Aug 5, 2019 |
| 8-K |
Current report
Material agreement
|
Jul 16, 2019 | Jul 16, 2019 |
| 8-K |
Current report
Material agreement
|
Jun 11, 2019 | Jun 11, 2019 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2019 | — |
| 10-Q | Quarterly report | May 9, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations
|
May 7, 2019 | May 6, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Apr 9, 2019 | Apr 8, 2019 |
| DEF 14A | Proxy statement | Feb 27, 2019 | Apr 8, 2019 |
| 10-K | Annual report | Feb 22, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations
|
Feb 19, 2019 | Feb 18, 2019 |
| 10-Q | Quarterly report | Nov 9, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 6, 2018 | Oct 31, 2018 |
| 10-Q | Quarterly report | Aug 9, 2018 | Jun 30, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2018 | Aug 6, 2018 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2018 | — |
| 10-Q | Quarterly report | May 9, 2018 | Mar 31, 2018 |
| 8-K |
Current report
Results of operations
|
May 8, 2018 | May 7, 2018 |
| S-3ASR | Automatic shelf registration | May 3, 2018 | — |
| S-3ASR | Automatic shelf registration | May 3, 2018 | — |
| 8-K |
Current report
Other events
|
Apr 20, 2018 | Apr 20, 2018 |
| 8-K |
Current report
Shareholder vote results
|
Apr 10, 2018 | Apr 9, 2018 |
| DEF 14A | Proxy statement | Feb 28, 2018 | Apr 9, 2018 |
| 10-K/A | Amended annual report | Feb 22, 2018 | Dec 31, 2017 |
| 10-K | Annual report | Feb 20, 2018 | Dec 31, 2017 |
| 8-K |
Current report
Results of operations, New debt
|
Feb 13, 2018 | Feb 7, 2018 |
| 8-K |
Current report
Material agreement
|
Dec 22, 2017 | Dec 18, 2017 |
| 8-K |
Current report
Officer or director change
|
Dec 19, 2017 | Dec 19, 2017 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 16, 2017 | Nov 14, 2017 |
| 10-Q | Quarterly report | Nov 8, 2017 | Sep 30, 2017 |
| 8-K |
Current report
Material agreement, Results of operations, Other events
|
Nov 2, 2017 | Oct 31, 2017 |
| 8-K |
Current report
Officer or director change
|
Sep 22, 2017 | Sep 19, 2017 |
| 10-Q | Quarterly report | Aug 9, 2017 | Jun 30, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2017 | Aug 7, 2017 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Jun 21, 2017 | Jun 21, 2017 |
| CT ORDER | Filing | Jun 9, 2017 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2017 | — |
| 10-K/A | Amended annual report | May 15, 2017 | Dec 31, 2016 |
| 10-Q | Quarterly report | May 9, 2017 | Mar 31, 2017 |
| 8-K |
Current report
Results of operations
|
May 2, 2017 | May 1, 2017 |
| 8-K |
Current report
Shareholder vote results
|
Apr 11, 2017 | Apr 10, 2017 |
| DEF 14A | Proxy statement | Mar 1, 2017 | Apr 10, 2017 |
| 10-K | Annual report | Feb 22, 2017 | Dec 31, 2016 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2017 | Feb 6, 2017 |
| 8-K |
Current report
New debt
|
Dec 15, 2016 | Dec 13, 2016 |
| 8-K |
Current report
Material agreement
|
Nov 17, 2016 | Nov 16, 2016 |
| 10-Q | Quarterly report | Nov 7, 2016 | Sep 30, 2016 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 3, 2016 | Oct 31, 2016 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 27, 2016 | Sep 23, 2016 |
| 10-Q | Quarterly report | Aug 9, 2016 | Jun 30, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2016 | Aug 8, 2016 |
| SD | Specialized disclosure (conflict minerals) | May 31, 2016 | — |
| 10-Q | Quarterly report | May 9, 2016 | Mar 31, 2016 |
| 8-K |
Current report
Results of operations
|
May 3, 2016 | May 2, 2016 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Apr 12, 2016 | Apr 11, 2016 |
| DEF 14A | Proxy statement | Mar 1, 2016 | Apr 11, 2016 |
| 10-K | Annual report | Feb 29, 2016 | Dec 31, 2015 |
| 8-K |
Current report
Other events
|
Feb 16, 2016 | Feb 16, 2016 |
| 8-K |
Current report
Material agreement, Results of operations, New debt
|
Feb 9, 2016 | Feb 5, 2016 |
| 10-Q | Quarterly report | Nov 9, 2015 | Sep 30, 2015 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 3, 2015 | Oct 29, 2015 |
| POSASR | Filing | Oct 13, 2015 | — |
| CT ORDER | Filing | Sep 18, 2015 | — |
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.