Company filings profile · CIK 0000880807
AMERICAN SUPERCONDUCTOR CORP /DE/ — SEC filings & insider activity.
Real, source-linked SEC EDGAR activity for AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC): 5 filings in the last 90 days vs 31 in the prior 90 (filing-velocity cooling ↓ · 0.16×). Latest material 8-K events, insider Form-4 transactions, and periodic reports — monitored for change.
✔ Verified against the public SEC EDGAR filing record as of Sep 22, 2026. Source-linked, daily-refreshed.
Material 8-K events — AMERICAN SUPERCONDUCTOR CORP /DE/
8-K disclosures decoded by item code (the material events: agreements, results, control/management changes, impairments, restatements).
| Filed | Event | |
|---|---|---|
| Sep 21, 2026 | Departure/Election of Directors or Officers | ↗ |
| Aug 5, 2026 | Results of Operations (earnings); Item 5.07; Financial Statements and Exhibits | ↗ |
| Jun 2, 2026 | Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| May 27, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Feb 4, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
Watch AMERICAN SUPERCONDUCTOR CORP /DE/ automatically
Add this company to a watchlist and get a webhook/email the moment it files a material 8-K, an insider Form 4, or changes its risk-factor language.
Insider transactions (Form 4 / 3 / 5)
Recent filings
| Filed | Form | Detail | |
|---|---|---|---|
| Sep 21, 2026 | 4 | 4 | ↗ |
| Sep 21, 2026 | 8-K | Departure/Election of Directors or Officers | ↗ |
| Aug 5, 2026 | 10-Q | FORM 10-Q | ↗ |
| Aug 5, 2026 | 8-K | Results of Operations (earnings); Item 5.07; Financial Statements and Exhibits | ↗ |
| Jul 31, 2026 | SCHEDULE 13G/A | ↗ | |
| Jun 18, 2026 | ARS | ARS | ↗ |
| Jun 18, 2026 | DEFA14A | DEFA14A | ↗ |
| Jun 18, 2026 | DEF 14A | DEF 14A | ↗ |
| Jun 12, 2026 | 4 | 4 | ↗ |
| Jun 11, 2026 | 144 | ↗ | |
| Jun 11, 2026 | 4 | 4 | ↗ |
| Jun 11, 2026 | 4 | 4 | ↗ |
| Jun 11, 2026 | 144 | ↗ | |
| Jun 10, 2026 | 4 | 4 | ↗ |
| Jun 10, 2026 | 4 | 4 | ↗ |
| Jun 10, 2026 | 144 | ↗ | |
| Jun 8, 2026 | 144 | ↗ | |
| Jun 8, 2026 | 144 | ↗ | |
| Jun 3, 2026 | 144 | ↗ | |
| Jun 3, 2026 | 144 | ↗ | |
| Jun 3, 2026 | 4 | 4 | ↗ |
| Jun 3, 2026 | 4 | 4 | ↗ |
| Jun 2, 2026 | 144 | ↗ | |
| Jun 2, 2026 | 144 | ↗ | |
| Jun 2, 2026 | 8-K | Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| May 29, 2026 | SD | FORM SD | ↗ |
| May 27, 2026 | 10-K | FORM 10-K | ↗ |
| May 27, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Apr 29, 2026 | SCHEDULE 13G | ↗ | |
| Apr 7, 2026 | 4 | 4 | ↗ |
| Apr 7, 2026 | 4 | 4 | ↗ |
| Apr 7, 2026 | 4 | 4 | ↗ |
| Apr 7, 2026 | 4 | 4 | ↗ |
| Apr 7, 2026 | 4 | 4 | ↗ |
| Apr 7, 2026 | 4 | 4 | ↗ |
| Mar 26, 2026 | SCHEDULE 13G/A | ↗ | |
| Feb 26, 2026 | 4 | 4 | ↗ |
| Feb 17, 2026 | 8-K/A | Financial Statements and Exhibits | ↗ |
| Feb 4, 2026 | 10-Q | FORM 10-Q | ↗ |
| Feb 4, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |