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 |
|---|---|---|---|
| ARS | Annual report to shareholders | Jun 18, 2026 | Mar 31, 2026 |
| 10-K | Annual report | May 27, 2026 | Mar 31, 2026 |
| ARS | Annual report to shareholders | Jun 13, 2025 | Mar 31, 2025 |
| 10-K | Annual report | May 21, 2025 | Mar 31, 2025 |
| ARS | Annual report to shareholders | Jun 20, 2024 | Mar 31, 2024 |
| 10-K | Annual report | May 29, 2024 | Mar 31, 2024 |
| ARS | Annual report to shareholders | Jun 28, 2023 | Dec 31, 2022 |
| 10-K | Annual report | May 31, 2023 | Mar 31, 2023 |
| 10-K | Annual report | Jun 1, 2022 | Mar 31, 2022 |
| 10-K | Annual report | Jun 2, 2021 | Mar 31, 2021 |
| 10-K | Annual report | Jun 2, 2020 | Mar 31, 2020 |
| 10-K | Annual report | Jun 5, 2019 | Mar 31, 2019 |
| 10-K/A | Amended annual report | Jun 7, 2018 | Jun 7, 2018 |
| 10-K | Annual report | Jun 6, 2018 | Mar 31, 2018 |
| 10-K | Annual report | May 25, 2017 | Mar 31, 2017 |
| 10-K | Annual report | May 31, 2016 | Mar 31, 2016 |
| ARS | Annual report to shareholders | Jun 25, 2015 | Mar 31, 2015 |
| 10-K | Annual report | May 28, 2015 | Mar 31, 2015 |
| ARS | Annual report to shareholders | Jun 24, 2014 | Mar 31, 2014 |
| 10-K | Annual report | Jun 5, 2014 | Mar 31, 2014 |
| ARS | Annual report to shareholders | Jun 25, 2013 | Mar 31, 2013 |
| 10-K | Annual report | Jun 14, 2013 | Mar 31, 2013 |
| ARS | Annual report to shareholders | Jul 25, 2012 | Mar 31, 2012 |
| 10-K/A | Amended annual report | Jun 26, 2012 | Mar 31, 2012 |
| 10-K/A | Amended annual report | Jun 8, 2012 | Mar 31, 2012 |
| 10-K | Annual report | Jun 6, 2012 | Mar 31, 2012 |
| ARS | Annual report to shareholders | Nov 14, 2011 | Mar 31, 2011 |
| 10-K | Annual report | Sep 23, 2011 | Mar 31, 2011 |
| ARS | Annual report to shareholders | Jun 24, 2010 | Mar 31, 2010 |
| 10-K | Annual report | May 27, 2010 | Mar 31, 2010 |
| ARS | Annual report to shareholders | Jun 25, 2009 | Mar 31, 2009 |
| 10-K | Annual report | May 28, 2009 | Mar 31, 2009 |
| ARS | Annual report to shareholders | Jun 27, 2008 | Mar 31, 2008 |
| 10-K | Annual report | May 29, 2008 | Mar 31, 2008 |
Showing 34 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
- 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
Other Motors & Generators companies
- Innio N.V. INIO
- Generac Holdings Inc. GNRC
- Franklin Electric Co Inc FELE
- 374Water Inc. SCWO
- Tian'an Technology Group Ltd TANAF
- Erayak Power Solution Group Inc. RAYA
- Alstom AOMFF
Source: SEC EDGAR filings. This is company-reported data, not investment advice.