AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC) Form 8-K Material Events
AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC) is a publicly traded company on the Nasdaq, categorized under SIC 3621 (Motors & Generators). Access real-time SEC filings, 10-K annual reports, 10-Q quarterlies, 8-K current reports, PCAOB auditor history, and executive compensation disclosures.
Ticker: AMSC
CIK: 880807
Exchange: Nasdaq
SIC 3621: Motors & Generators
Fiscal Year End: 03/31
State: DE
Independent PCAOB Auditor
Explore PCAOB Audit Intelligence →
Audit Firm
RSM US LLP
Auditor SinceSince 3/31/2017 12:00:00 AM
Lead Engagement PartnerMeaghan Switzer
Audit LocationBoston, Massachusetts, United States
Latest SEC EDGAR Filings
Showing 10-K, 10-Q, 8-K, Form 4, and other SEC submissions| Form | Filing Date | Reporting Period | Description | Accession Number | Actions |
|---|---|---|---|---|---|
| 4 | 2026-09-21 | 2026-09-18 | 4 | 0001193125-26-396831 | View SEC Doc Filr Page |
| 8-K | 2026-09-21 | 2026-09-17 | FORM 8-K | 0001437749-26-030822 | View SEC Doc Filr Page |
| 10-Q | 2026-08-05 | 2026-06-30 | FORM 10-Q | 0001437749-26-025922 | View SEC Doc Filr Page |
| 8-K | 2026-08-05 | 2026-07-31 | FORM 8-K | 0001437749-26-025921 | View SEC Doc Filr Page |
| SCHEDULE 13G/A | 2026-07-31 | — | SCHEDULE 13G/A Filing | 0002100119-26-001340 | View SEC Doc Filr Page |
| ARS | 2026-06-18 | 2026-03-31 | ARS | 0001193125-26-275845 | View SEC Doc Filr Page |
| DEFA14A | 2026-06-18 | — | DEFA14A | 0001193125-26-275831 | View SEC Doc Filr Page |
| DEF 14A | 2026-06-18 | 2026-07-31 | DEF 14A | 0001193125-26-275809 | View SEC Doc Filr Page |
| 4 | 2026-06-12 | 2026-06-11 | 4 | 0001193125-26-269433 | View SEC Doc Filr Page |
| 144 | 2026-06-11 | — | 144 Filing | 0001950047-26-005955 | View SEC Doc Filr Page |
| 4 | 2026-06-11 | 2026-06-11 | 4 | 0001193125-26-267677 | View SEC Doc Filr Page |
| 4 | 2026-06-11 | 2026-06-11 | 4 | 0001193125-26-267642 | View SEC Doc Filr Page |
| 144 | 2026-06-11 | — | 144 Filing | 0001950047-26-005923 | View SEC Doc Filr Page |
| 4 | 2026-06-10 | 2026-06-08 | 4 | 0001193125-26-265996 | View SEC Doc Filr Page |
| 4 | 2026-06-10 | 2026-06-08 | 4 | 0001193125-26-265990 | View SEC Doc Filr Page |
| 144 | 2026-06-10 | — | 144 Filing | 0001949846-26-000370 | View SEC Doc Filr Page |
| 144 | 2026-06-08 | — | 144 Filing | 0001950047-26-005745 | View SEC Doc Filr Page |
| 144 | 2026-06-08 | — | 144 Filing | 0001950047-26-005744 | View SEC Doc Filr Page |
| 144 | 2026-06-03 | — | 144 Filing | 0001950047-26-005559 | View SEC Doc Filr Page |
| 144 | 2026-06-03 | — | 144 Filing | 0001950047-26-005556 | View SEC Doc Filr Page |
| 4 | 2026-06-03 | 2026-06-01 | 4 | 0001193125-26-255471 | View SEC Doc Filr Page |
| 4 | 2026-06-03 | 2026-06-01 | 4 | 0001193125-26-255450 | View SEC Doc Filr Page |
| 144 | 2026-06-02 | — | 144 Filing | 0001950047-26-005517 | View SEC Doc Filr Page |
| 144 | 2026-06-02 | — | 144 Filing | 0001950047-26-005472 | View SEC Doc Filr Page |
| 8-K | 2026-06-02 | 2026-06-01 | FORM 8-K | 0001437749-26-019163 | View SEC Doc Filr Page |