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 |
|---|---|---|---|
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 21, 2025 | — |
| SD | Specialized disclosure (conflict minerals) | May 28, 2024 | — |
| EFFECT | Filing | Mar 15, 2024 | — |
| CORRESP | Letter to the SEC | Mar 13, 2024 | — |
| CORRESP | Letter to the SEC | Mar 6, 2024 | — |
| CORRESP | Letter to the SEC | Mar 5, 2024 | — |
| UPLOAD | Letter from the SEC | Feb 5, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2023 | — |
| SD | Specialized disclosure (conflict minerals) | May 23, 2022 | — |
| EFFECT | Filing | Jun 21, 2021 | — |
| POSASR | Filing | Jun 2, 2021 | — |
| SD | Specialized disclosure (conflict minerals) | May 27, 2021 | — |
| SD | Specialized disclosure (conflict minerals) | May 26, 2020 | — |
| SD | Specialized disclosure (conflict minerals) | May 30, 2019 | — |
| CT ORDER | Filing | May 30, 2019 | — |
| CT ORDER | Filing | Feb 13, 2019 | — |
| CT ORDER | Filing | Aug 30, 2018 | — |
| CT ORDER | Filing | Aug 10, 2018 | — |
| CT ORDER | Filing | Aug 10, 2018 | — |
| CT ORDER | Filing | Jul 13, 2018 | — |
| SD | Specialized disclosure (conflict minerals) | May 25, 2018 | — |
| EFFECT | Filing | Feb 15, 2018 | — |
| UPLOAD | Letter from the SEC | Feb 13, 2018 | — |
| CORRESP | Letter to the SEC | Feb 13, 2018 | — |
| EFFECT | Filing | Oct 23, 2017 | — |
| CORRESP | Letter to the SEC | Oct 17, 2017 | — |
| UPLOAD | Letter from the SEC | Oct 11, 2017 | — |
| CT ORDER | Filing | Sep 11, 2017 | — |
| CT ORDER | Filing | Jul 10, 2017 | — |
| SD | Specialized disclosure (conflict minerals) | May 25, 2017 | — |
| CT ORDER | Filing | Nov 17, 2016 | — |
| CT ORDER | Filing | Jul 20, 2016 | — |
| SD | Specialized disclosure (conflict minerals) | May 27, 2016 | — |
| CT ORDER | Filing | Apr 5, 2016 | — |
| CT ORDER | Filing | Dec 17, 2015 | — |
| SD | Specialized disclosure (conflict minerals) | May 28, 2015 | — |
| CT ORDER | Filing | Dec 29, 2014 | — |
| EFFECT | Filing | Oct 1, 2014 | — |
| CT ORDER | Filing | Jul 21, 2014 | — |
| SD | Specialized disclosure (conflict minerals) | May 30, 2014 | — |
| EFFECT | Filing | Sep 25, 2013 | — |
| CT ORDER | Filing | Mar 14, 2013 | — |
| EFFECT | Filing | Nov 16, 2012 | — |
| EFFECT | Filing | Oct 18, 2012 | — |
| EFFECT | Filing | Oct 18, 2012 | — |
| EFFECT | Filing | Jun 8, 2012 | — |
| EFFECT | Filing | Apr 26, 2012 | — |
| D | Filing | Apr 19, 2012 | — |
| NT 10-Q | Form nt 10-q | Aug 10, 2011 | Jun 30, 2011 |
| NT 10-K | Filing | May 31, 2011 | Mar 31, 2011 |
| CT ORDER | Filing | Feb 28, 2011 | — |
| CT ORDER | Filing | Feb 3, 2011 | — |
| CT ORDER | Filing | Feb 1, 2011 | — |
| CT ORDER | Filing | Oct 14, 2010 | — |
| CT ORDER | Filing | Jan 12, 2010 | — |
| CT ORDER | Filing | Aug 17, 2009 | — |
| CT ORDER | Filing | Jul 30, 2009 | — |
| CT ORDER | Filing | Mar 12, 2009 | — |
| CT ORDER | Filing | Jul 30, 2008 | — |
| CT ORDER | Filing | Jul 22, 2008 | — |
| CT ORDER | Filing | May 22, 2008 | — |
Showing 62 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
- 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.