AMSC - Company ID 0000880807
AMERICAN SUPERCONDUCTOR CORP /DE/ has filed 1,296 public company documents between 1996 and 2026. The most frequent type is insider trade (505 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Type | Filing | Filed | Period covered | Open |
|---|---|---|---|---|
| SCHEDULE 13G | SCHEDULE 13G | 2mo ago2026-04-29 | - | View filing |
| 4 | Insider trade | 3mo ago2026-04-07 | 2026-04-03 | View filing |
| 4 | Insider trade | 3mo ago2026-04-07 | 2026-04-03 | View filing |
| 4 | Insider trade | 3mo ago2026-04-07 | 2026-04-03 | View filing |
| 4 | Insider trade | 3mo ago2026-04-07 | 2026-04-03 | View filing |
| 4 | Insider trade | 3mo ago2026-04-07 | 2026-04-03 | View filing |
| 4 | Insider trade | 3mo ago2026-04-07 | 2026-04-03 | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 3mo ago2026-03-26 | - | View filing |
| 4 | Insider trade | 4mo ago2026-02-26 | 2026-02-24 | View filing |
| 8-K/A | Major company event (amended) | 4mo ago2026-02-17 | 2025-12-05 | View filing |
| 10-Q | Quarterly report | 5mo ago2026-02-04 | 2025-12-31 | View filing |
| 8-K | Major company event | 5mo ago2026-02-04 | 2026-02-04 | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 5mo ago2026-01-30 | - | View filing |
| 8-K | Major company event | 6mo ago2025-12-23 | 2025-12-23 | View filing |
| 424B7 | 424B7 | 6mo ago2025-12-23 | - | View filing |
| 8-K | Major company event | 7mo ago2025-12-10 | 2025-12-05 | View filing |
| 4 | Insider trade | 8mo ago2025-11-13 | 2019-06-18 | View filing |
| 10-Q | Quarterly report | 8mo ago2025-11-05 | 2025-09-30 | View filing |
| 8-K | Major company event | 8mo ago2025-11-05 | 2025-11-05 | View filing |
| 144 | Insider sale notice | 11mo ago2025-08-08 | - | View filing |
| 4 | Insider trade | 11mo ago2025-08-08 | 2025-08-06 | View filing |
| 4 | Insider trade | 11mo ago2025-08-06 | 2022-08-04 | View filing |
| 4 | Insider trade | 11mo ago2025-08-06 | 2025-08-04 | View filing |
| 4 | Insider trade | 11mo ago2025-08-06 | 2025-08-04 | View filing |
| 144 | Insider sale notice | 11mo ago2025-08-04 | - | View filing |
| 144 | Insider sale notice | 11mo ago2025-08-04 | - | View filing |
| 10-Q | Quarterly report | 11mo ago2025-07-30 | 2025-06-30 | View filing |
| 8-K | Major company event | 11mo ago2025-07-30 | 2025-07-30 | View filing |
| 8-K | Major company event | 11mo ago2025-07-29 | 2025-07-25 | View filing |
| ARS | Annual report to shareholders | 1y ago2025-06-13 | 2025-03-31 | View filing |
| DEFA14A | Proxy materials | 1y ago2025-06-13 | - | View filing |
| DEF 14A | Proxy statement | 1y ago2025-06-13 | 2025-07-25 | View filing |
| 4 | Insider trade | 1y ago2025-06-12 | 2025-06-11 | View filing |
| 4 | Insider trade | 1y ago2025-06-12 | 2025-06-11 | View filing |
| 144 | Insider sale notice | 1y ago2025-06-11 | - | View filing |
| 144 | Insider sale notice | 1y ago2025-06-11 | - | View filing |
| 8-K | Major company event | 1y ago2025-06-11 | 2025-06-10 | View filing |
| 424B5 | Prospectus supplement | 1y ago2025-06-11 | - | View filing |
| 424B5 | Prospectus supplement | 1y ago2025-06-10 | - | View filing |
| 4 | Insider trade | 1y ago2025-06-09 | 2025-06-06 | View filing |
| 4 | Insider trade | 1y ago2025-06-09 | 2025-06-06 | View filing |
| 144 | Insider sale notice | 1y ago2025-06-06 | - | View filing |
| 144 | Insider sale notice | 1y ago2025-06-06 | - | View filing |
| 4 | Insider trade | 1y ago2025-05-29 | 2025-05-27 | View filing |
| 4 | Insider trade | 1y ago2025-05-29 | 2025-05-27 | View filing |
| 4 | Insider trade | 1y ago2025-05-29 | 2025-05-27 | View filing |
| 3 | New insider ownership | 1y ago2025-05-29 | 2025-05-27 | View filing |
| 144 | Insider sale notice | 1y ago2025-05-27 | - | View filing |
| 144 | Insider sale notice | 1y ago2025-05-27 | - | View filing |
| 4 | Insider trade | 1y ago2025-05-22 | 2025-05-20 | View filing |