American Superconductor Corp /DE/ SEC filings AMSC
American Superconductor Corp /DE/ has 1,003 filings in SEC EDGAR's recent list, going back to Jan 31, 2008. Its latest annual report, Form ARS, was filed on Jun 18, 2026 for the period ended Mar 31, 2026. 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 4, 2026 (results of operations). The company's fiscal year ends on March 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Results of operations
|
Nov 4, 2026 | Nov 4, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 21, 2026 | Sep 17, 2026 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
Aug 5, 2026 | Jul 31, 2026 |
| 8-K |
Current report
Officer or director change
|
Jun 2, 2026 | Jun 1, 2026 |
| 8-K |
Current report
Results of operations
|
May 27, 2026 | May 27, 2026 |
| 8-K/A | Amended current report | Feb 17, 2026 | Dec 5, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2026 | Feb 4, 2026 |
| 8-K |
Current report
Other events
|
Dec 23, 2025 | Dec 23, 2025 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Unregistered share sale, Other events
|
Dec 10, 2025 | Dec 5, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2025 | Nov 5, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2025 | Jul 30, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jul 29, 2025 | Jul 25, 2025 |
| 8-K |
Current report
Other events
|
Jun 11, 2025 | Jun 10, 2025 |
| 8-K |
Current report
Results of operations, Officer or director change
|
May 21, 2025 | May 15, 2025 |
| 8-K |
Current report
Results of operations, Bylaw or fiscal year change
|
Feb 5, 2025 | Jan 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 30, 2024 | Oct 30, 2024 |
| 8-K |
Current report
Other events
|
Aug 13, 2024 | Aug 12, 2024 |
| 8-K/A | Amended current report | Aug 6, 2024 | Aug 1, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2024 | Aug 6, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 5, 2024 | Aug 2, 2024 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Other events
|
Aug 5, 2024 | Aug 1, 2024 |
| 8-K |
Current report
Results of operations, Officer or director change
|
May 29, 2024 | May 23, 2024 |
| 8-K |
Current report
Other events
|
Jan 31, 2024 | Jan 30, 2024 |
| 8-K |
Current report
Results of operations
|
Jan 24, 2024 | Jan 24, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 1, 2023 | Nov 1, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Aug 11, 2023 | Aug 11, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2023 | Aug 9, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 21, 2023 | Jun 15, 2023 |
| 8-K |
Current report
Results of operations
|
May 31, 2023 | May 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 1, 2023 | Feb 1, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 1, 2022 | Nov 1, 2022 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 5, 2022 | Aug 2, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2022 | Aug 3, 2022 |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2022 | Jun 7, 2022 |
| 8-K |
Current report
Results of operations
|
Jun 1, 2022 | Jun 1, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 2, 2022 | Feb 2, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2021 | Nov 8, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2021 | Aug 4, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Aug 2, 2021 | Jul 30, 2021 |
| 8-K |
Current report
Results of operations
|
Jun 2, 2021 | Jun 2, 2021 |
| 8-K |
Current report
Officer or director change
|
May 25, 2021 | May 20, 2021 |
| 8-K |
Current report
Other events
|
May 21, 2021 | May 21, 2021 |
| 8-K |
Current report
Material agreement
|
May 10, 2021 | May 6, 2021 |
| 8-K |
Current report
Other events
|
Feb 26, 2021 | Feb 26, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2021 | Feb 3, 2021 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Feb 1, 2021 | Jan 28, 2021 |
| 8-K/A | Amended current report | Dec 14, 2020 | Oct 1, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2020 | Nov 4, 2020 |
| 8-K |
Current report
Other events
|
Oct 26, 2020 | Oct 22, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 5, 2020 | Oct 5, 2020 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Unregistered share sale
|
Oct 5, 2020 | Oct 1, 2020 |
| 8-K |
Current report
Other events
|
Oct 2, 2020 | Oct 1, 2020 |
| 8-K |
Current report
Other events
|
Sep 16, 2020 | Sep 11, 2020 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
Aug 5, 2020 | Jul 31, 2020 |
| 8-K |
Current report
Results of operations
|
Jun 2, 2020 | Jun 2, 2020 |
| 8-K |
Current report
Officer or director change
|
May 27, 2020 | May 21, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2020 | Feb 5, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2019 | Nov 5, 2019 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 6, 2019 | Aug 1, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2019 | Aug 6, 2019 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Jun 5, 2019 | Jun 1, 2019 |
| 8-K |
Current report
Officer or director change
|
May 24, 2019 | May 21, 2019 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 5, 2019 | Feb 5, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2018 | Nov 6, 2018 |
| 8-K |
Current report
Material agreement
|
Oct 31, 2018 | Oct 31, 2018 |
| 8-K |
Current report
Shareholder vote results
|
Aug 1, 2018 | Jul 27, 2018 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2018 | Jul 31, 2018 |
| 8-K |
Current report
Material agreement
|
Jul 9, 2018 | Jul 3, 2018 |
| 8-K |
Current report
Officer or director change
|
Jul 3, 2018 | Jun 28, 2018 |
| 8-K |
Current report
Officer or director change
|
Jun 14, 2018 | Jun 14, 2018 |
| 8-K |
Current report
Results of operations
|
Jun 6, 2018 | Jun 6, 2018 |
| 8-K |
Current report
Officer or director change
|
Apr 10, 2018 | Apr 10, 2018 |
| 8-K |
Current report
Acquisition or sale of assets
|
Apr 3, 2018 | Mar 28, 2018 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2018 | Feb 5, 2018 |
| 8-K |
Current report
Material agreement
|
Feb 1, 2018 | Feb 1, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2017 | Nov 7, 2017 |
| 8-K |
Current report
Unregistered share sale, Other events
|
Sep 26, 2017 | Sep 25, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2017 | Aug 8, 2017 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 1, 2017 | Jul 27, 2017 |
| 8-K |
Current report
Officer or director change
|
Jul 3, 2017 | Jun 28, 2017 |
| 8-K |
Current report
Other events
|
May 26, 2017 | May 24, 2017 |
| 8-K/A |
Amended current report
Results of operations
|
May 25, 2017 | May 25, 2017 |
| 8-K |
Current report
Results of operations
|
May 25, 2017 | May 25, 2017 |
| 8-K |
Current report
Other events
|
May 10, 2017 | May 5, 2017 |
| 8-K |
Current report
Officer or director change
|
May 9, 2017 | May 7, 2017 |
| 8-K |
Current report
Agreement ended, Other events
|
May 4, 2017 | May 4, 2017 |
| 8-K |
Current report
Results of operations
|
Apr 26, 2017 | Apr 26, 2017 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change
|
Apr 4, 2017 | Apr 3, 2017 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2017 | Feb 6, 2017 |
| 8-K |
Current report
Material agreement, Results of operations
|
Jan 27, 2017 | Jan 27, 2017 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2016 | Nov 2, 2016 |
| 8-K |
Current report
Officer or director change
|
Sep 16, 2016 | Sep 15, 2016 |
| 8-K |
Current report
Other events
|
Aug 23, 2016 | Aug 17, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2016 | Aug 9, 2016 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 2, 2016 | Jul 29, 2016 |
| 8-K |
Current report
Results of operations
|
May 31, 2016 | May 31, 2016 |
| 8-K |
Current report
Officer or director change
|
May 18, 2016 | May 12, 2016 |
| 8-K |
Current report
Material agreement
|
Mar 8, 2016 | Mar 4, 2016 |
| 8-K |
Current report
Results of operations
|
Feb 9, 2016 | Feb 9, 2016 |
| 8-K |
Current report
Material agreement
|
Dec 17, 2015 | Dec 16, 2015 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2015 | Nov 3, 2015 |
| 8-K |
Current report
Material agreement
|
Aug 31, 2015 | Aug 26, 2015 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2015 | Aug 5, 2015 |
| 8-K |
Current report
Shareholder vote results
|
Jul 31, 2015 | Jul 31, 2015 |
| 8-K |
Current report
Officer or director change
|
Jun 26, 2015 | Jun 23, 2015 |
| 8-K |
Current report
Other events
|
Jun 9, 2015 | Jun 3, 2015 |
| 8-K |
Current report
Results of operations
|
May 28, 2015 | May 28, 2015 |
| 8-K |
Current report
Other events
|
Apr 28, 2015 | Apr 24, 2015 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 23, 2015 | Apr 23, 2015 |
| 8-K |
Current report
Other events
|
Apr 23, 2015 | Apr 23, 2015 |
| 8-K |
Current report
Other events
|
Apr 10, 2015 | Apr 9, 2015 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Mar 24, 2015 | Mar 24, 2015 |
| 8-K |
Current report
Shareholder vote results
|
Mar 18, 2015 | Mar 18, 2015 |
| 8-K |
Current report
Results of operations
|
Feb 5, 2015 | Feb 5, 2015 |
| 8-K |
Current report
Results of operations
|
Jan 29, 2015 | Jan 29, 2015 |
| 8-K |
Current report
Listing notice, Other events
|
Jan 21, 2015 | Jan 14, 2015 |
| 8-K |
Current report
Officer or director change
|
Jan 6, 2015 | Dec 31, 2014 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Dec 22, 2014 | Dec 19, 2014 |
| 8-K |
Current report
Material agreement
|
Nov 13, 2014 | Nov 7, 2014 |
| 8-K |
Current report
Agreement ended, Regulation FD disclosure
|
Nov 7, 2014 | Nov 7, 2014 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2014 | Nov 6, 2014 |
| 8-K |
Current report
Results of operations, Other events
|
Oct 1, 2014 | Oct 1, 2014 |
| 8-K |
Current report
Other events
|
Sep 4, 2014 | Aug 29, 2014 |
| 8-K |
Current report
Material agreement
|
Aug 21, 2014 | Aug 15, 2014 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 6, 2014 | Jul 31, 2014 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2014 | Aug 5, 2014 |
| 8-K |
Current report
Other events
|
Jul 16, 2014 | Jul 16, 2014 |
| 8-K |
Current report
Unregistered share sale, Other events
|
Jun 23, 2014 | Jun 18, 2014 |
| 8-K |
Current report
Results of operations
|
Jun 5, 2014 | Jun 5, 2014 |
| 8-K |
Current report
Material agreement
|
Jun 5, 2014 | Jun 2, 2014 |
| 8-K |
Current report
Exit or restructuring costs
|
Mar 19, 2014 | Mar 14, 2014 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Mar 3, 2014 | Mar 2, 2014 |
| 8-K |
Current report
Other events
|
Feb 28, 2014 | Feb 28, 2014 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 6, 2014 | Feb 4, 2014 |
| 8-K |
Current report
Unregistered share sale, Other events
|
Nov 20, 2013 | Nov 19, 2013 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Nov 18, 2013 | Nov 15, 2013 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2013 | Nov 7, 2013 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Oct 9, 2013 | Oct 9, 2013 |
| 8-K |
Current report
Officer or director change
|
Sep 25, 2013 | Sep 20, 2013 |
| 8-K |
Current report
Auditor change
|
Aug 21, 2013 | Aug 15, 2013 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2013 | Aug 7, 2013 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Aug 2, 2013 | Jul 31, 2013 |
| 8-K |
Current report
Results of operations
|
Jun 14, 2013 | Jun 14, 2013 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 1, 2013 | Apr 1, 2013 |
| 8-K |
Current report
Officer or director change
|
Feb 20, 2013 | Feb 14, 2013 |
| 8-K |
Current report
Material agreement
|
Feb 14, 2013 | Feb 8, 2013 |
| 8-K |
Current report
Results of operations
|
Feb 11, 2013 | Feb 11, 2013 |
| 8-K |
Current report
Officer or director change
|
Jan 8, 2013 | Jan 2, 2013 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Dec 21, 2012 | Dec 20, 2012 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change, Regulation FD disclosure
|
Nov 28, 2012 | Nov 27, 2012 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2012 | Nov 6, 2012 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2012 | Aug 2, 2012 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jul 27, 2012 | Jul 26, 2012 |
| 8-K |
Current report
Material agreement, Results of operations, New debt, Unregistered share sale, Officer or director change
|
Jun 6, 2012 | Jun 5, 2012 |
| 8-K |
Current report
Officer or director change
|
May 9, 2012 | May 9, 2012 |
| 8-K |
Current report
Other events
|
Apr 20, 2012 | Apr 20, 2012 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 13, 2012 | Apr 13, 2012 |
| 8-K |
Current report
Material agreement, Results of operations, New debt, Unregistered share sale
|
Apr 4, 2012 | Apr 4, 2012 |
| 8-K |
Current report
Results of operations
|
Feb 9, 2012 | Feb 9, 2012 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Feb 6, 2012 | Dec 8, 2011 |
| 8-K |
Current report
Shareholder vote results
|
Dec 8, 2011 | Dec 8, 2011 |
| 8-K |
Current report
Exit or restructuring costs
|
Nov 29, 2011 | Nov 29, 2011 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2011 | Nov 9, 2011 |
| 8-K |
Current report
Agreement ended
|
Oct 31, 2011 | Oct 28, 2011 |
| 8-K |
Current report
Other events
|
Oct 7, 2011 | Oct 7, 2011 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 3, 2011 | Oct 3, 2011 |
| 8-K |
Current report
Results of operations
|
Sep 23, 2011 | Sep 23, 2011 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 15, 2011 | Sep 14, 2011 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 6, 2011 | Sep 6, 2011 |
| 8-K |
Current report
Listing notice, Regulation FD disclosure
|
Aug 18, 2011 | Aug 16, 2011 |
| 8-K |
Current report
Officer or director change
|
Aug 11, 2011 | Aug 8, 2011 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs
|
Aug 11, 2011 | Aug 11, 2011 |
| 8-K |
Current report
Results of operations, Restatement
|
Jul 11, 2011 | Jul 6, 2011 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Jun 30, 2011 | Jun 29, 2011 |
| 8-K |
Current report
Listing notice, Regulation FD disclosure
|
Jun 21, 2011 | Jun 17, 2011 |
| 8-K |
Current report
Material agreement
|
Jun 13, 2011 | Jun 7, 2011 |
| 8-K |
Current report
Officer or director change
|
May 24, 2011 | May 23, 2011 |
| 8-K |
Current report
Results of operations
|
Apr 5, 2011 | Apr 5, 2011 |
| 8-K |
Current report
Officer or director change
|
Mar 15, 2011 | Mar 10, 2011 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Mar 14, 2011 | Mar 12, 2011 |
| 8-K |
Current report
Results of operations
|
Feb 1, 2011 | Feb 1, 2011 |
| 8-K |
Current report
Other events
|
Nov 12, 2010 | Nov 10, 2010 |
| 8-K |
Current report
Other events
|
Nov 8, 2010 | Nov 8, 2010 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2010 | Nov 2, 2010 |
| 8-K/A |
Amended current report
Material agreement
|
Sep 15, 2010 | May 12, 2010 |
| 8-K |
Current report
Shareholder vote results
|
Aug 6, 2010 | Aug 6, 2010 |
| 8-K |
Current report
Results of operations
|
Jul 29, 2010 | Jul 29, 2010 |
| 8-K |
Current report
Material agreement
|
May 17, 2010 | May 12, 2010 |
| 8-K |
Current report
Officer or director change
|
May 14, 2010 | May 12, 2010 |
| 8-K |
Current report
Results of operations
|
May 13, 2010 | May 13, 2010 |
| 8-K |
Current report
Other events
|
Feb 8, 2010 | Feb 4, 2010 |
| 8-K |
Current report
Results of operations
|
Feb 2, 2010 | Feb 2, 2010 |
| 8-K |
Current report
Officer or director change
|
Dec 15, 2009 | Dec 11, 2009 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2009 | Oct 29, 2009 |
| 8-K |
Current report
Officer or director change
|
Aug 12, 2009 | Aug 6, 2009 |
| 8-K |
Current report
Material agreement, Results of operations
|
Jul 30, 2009 | Jul 24, 2009 |
| 8-K |
Current report
Officer or director change
|
May 15, 2009 | May 12, 2009 |
| 8-K |
Current report
Results of operations
|
May 14, 2009 | May 14, 2009 |
| 8-K |
Current report
Officer or director change
|
Apr 20, 2009 | Apr 16, 2009 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2009 | Feb 3, 2009 |
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
- Motors & Generators (SIC 3621)
- Listed as
- AMSC (Nasdaq)
- Fiscal year ends
- March 31
- Incorporated in
- DE
- Headquarters
- Devens, MA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 880807
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.