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 |
|---|---|---|---|
| 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 |
| 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 |
| 8-K |
Current report
Material agreement
|
May 29, 2026 | May 28, 2026 |
| 8-K |
Current report
Other events
|
May 15, 2026 | May 15, 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2025 | Nov 3, 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 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2024 | Nov 4, 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 |
| 8-K |
Current report
Results of operations
|
May 7, 2024 | May 6, 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Other events
|
Mar 31, 2023 | Mar 31, 2023 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2022 | Aug 1, 2022 |
| 8-K |
Current report
New debt
|
May 23, 2022 | May 20, 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
May 4, 2021 | May 3, 2021 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Apr 14, 2021 | Apr 12, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 16, 2021 | Feb 15, 2021 |
| 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 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2020 | Aug 3, 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 |
| 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 |
| 8-K |
Current report
New debt
|
Feb 26, 2020 | Feb 25, 2020 |
| 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Feb 19, 2019 | Feb 18, 2019 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 6, 2018 | Oct 31, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2018 | Aug 6, 2018 |
| 8-K |
Current report
Results of operations
|
May 8, 2018 | May 7, 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2016 | Aug 8, 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 |
| 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 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 3, 2015 | Oct 29, 2015 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2015 | Aug 3, 2015 |
| 8-K |
Current report
Material agreement
|
Jun 15, 2015 | Jun 12, 2015 |
| 8-K |
Current report
Material agreement
|
May 11, 2015 | May 11, 2015 |
| 8-K |
Current report
Results of operations
|
May 5, 2015 | May 4, 2015 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Apr 15, 2015 | Apr 13, 2015 |
| 8-K |
Current report
Material agreement
|
Mar 18, 2015 | Mar 16, 2015 |
| 8-K |
Current report
Officer or director change
|
Feb 11, 2015 | Feb 6, 2015 |
| 8-K |
Current report
Results of operations
|
Feb 10, 2015 | Feb 9, 2015 |
| 8-K |
Current report
Material agreement, Results of operations
|
Nov 4, 2014 | Nov 3, 2014 |
| 8-K |
Current report
Officer or director change
|
Sep 26, 2014 | Sep 22, 2014 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Aug 5, 2014 | Aug 4, 2014 |
| 8-K |
Current report
Officer or director change
|
May 14, 2014 | May 8, 2014 |
| 8-K |
Current report
Results of operations
|
May 6, 2014 | May 5, 2014 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Apr 17, 2014 | Apr 14, 2014 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 14, 2014 | Apr 14, 2014 |
| 8-K |
Current report
New debt
|
Mar 5, 2014 | Feb 27, 2014 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Feb 11, 2014 | Feb 5, 2014 |
| 8-K |
Current report
Material agreement
|
Jan 31, 2014 | Jan 30, 2014 |
| 8-K |
Current report
Other events
|
Dec 2, 2013 | Nov 25, 2013 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2013 | Nov 4, 2013 |
| 8-K |
Current report
Material agreement
|
Nov 1, 2013 | Oct 29, 2013 |
| 8-K |
Current report
Material agreement, New debt
|
Aug 16, 2013 | Aug 14, 2013 |
| 8-K |
Current report
Officer or director change
|
Aug 15, 2013 | Aug 15, 2013 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2013 | Aug 5, 2013 |
| 8-K |
Current report
Officer or director change
|
May 20, 2013 | May 14, 2013 |
| 8-K |
Current report
Results of operations
|
May 7, 2013 | May 6, 2013 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Apr 10, 2013 | Apr 8, 2013 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 7, 2013 | Mar 1, 2013 |
| 8-K |
Current report
Material agreement
|
Feb 22, 2013 | Feb 5, 2013 |
| 8-K |
Current report
Results of operations
|
Feb 12, 2013 | Feb 11, 2013 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2012 | Nov 5, 2012 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 2, 2012 | Oct 29, 2012 |
| 8-K |
Current report
Material agreement
|
Oct 15, 2012 | Oct 10, 2012 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2012 | Aug 6, 2012 |
| 8-K |
Current report
Other events
|
Jul 16, 2012 | Jul 13, 2012 |
| 8-K |
Current report
Material agreement
|
May 14, 2012 | May 14, 2012 |
| 8-K |
Current report
Results of operations
|
May 8, 2012 | May 7, 2012 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Apr 19, 2012 | Apr 16, 2012 |
| 8-K |
Current report
Officer or director change
|
Mar 20, 2012 | Mar 14, 2012 |
| 8-K |
Current report
Results of operations
|
Feb 7, 2012 | Feb 6, 2012 |
| 8-K |
Current report
Agreement ended
|
Jan 9, 2012 | Jan 6, 2012 |
| 8-K |
Current report
Officer or director change
|
Jan 6, 2012 | Jan 3, 2012 |
| 8-K |
Current report
Other events
|
Dec 30, 2011 | Dec 29, 2011 |
| 8-K |
Current report
Officer or director change
|
Dec 20, 2011 | Dec 16, 2011 |
| 8-K |
Current report
Material agreement
|
Dec 13, 2011 | Dec 12, 2011 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 6, 2011 | Dec 1, 2011 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Nov 4, 2011 | Nov 3, 2011 |
| 8-K |
Current report
Officer or director change
|
Sep 9, 2011 | Sep 8, 2011 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2011 | Aug 8, 2011 |
| 8-K |
Current report
Material agreement, New debt
|
Aug 3, 2011 | Jul 29, 2011 |
| 8-K |
Current report
Results of operations
|
May 10, 2011 | May 9, 2011 |
| 8-K |
Current report
Shareholder vote results
|
Apr 15, 2011 | Apr 11, 2011 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 8, 2011 | Mar 3, 2011 |
| 8-K |
Current report
Results of operations
|
Feb 8, 2011 | Feb 7, 2011 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2010 | Oct 28, 2010 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 4, 2010 | Sep 30, 2010 |
| 8-K |
Current report
Material agreement, Results of operations
|
Aug 3, 2010 | Jul 29, 2010 |
| 8-K |
Current report
Material agreement
|
Jun 29, 2010 | Jun 23, 2010 |
| 8-K |
Current report
Material agreement, New debt
|
May 10, 2010 | May 4, 2010 |
| 8-K |
Current report
Results of operations
|
May 4, 2010 | May 3, 2010 |
| 8-K |
Current report
Shareholder vote results
|
Apr 14, 2010 | Apr 12, 2010 |
| 8-K |
Current report
Other events
|
Apr 5, 2010 | Apr 5, 2010 |
| 8-K |
Current report
Material agreement
|
Mar 17, 2010 | Mar 17, 2010 |
| 8-K |
Current report
Results of operations
|
Feb 9, 2010 | Feb 8, 2010 |
| 8-K |
Current report
Other events
|
Dec 4, 2009 | Dec 1, 2009 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2009 | Oct 29, 2009 |
| 8-K |
Current report
Agreement ended
|
Sep 16, 2009 | Sep 11, 2009 |
| 8-K |
Current report
Other events
|
Sep 11, 2009 | Sep 11, 2009 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2009 | Aug 3, 2009 |
Showing 176 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
Other Electric Services companies
- Nextera Energy Inc NEE
- Southern Co SO
- Constellation Energy Corp CEG
- American Electric Power Co Inc AEP
- Dominion Energy, Inc D
- Entergy Corp /DE/ ETR
- Vistra Corp. VST
- Fortis Inc. FTS
Source: SEC EDGAR filings. This is company-reported data, not investment advice.