🕵️ American Superconductor Corporation ($AMSC)
SEC insider & ownership activity, last 12 months · CIK 880807 · every row links its SEC filing
Over the last 12 months insiders sold $17.1M against $4K of open-market buying. Daniel McGahn sold $10.8M (Aug–Jun). 4 planned sales are pending, the largest $3.7M (Daniel McGahn). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
2 buyers, $4K (2 lots) · 5 sellers, $17.1M (31 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Daniel McGahn | 0 | – | 14 | $10.8M | Jun 11, 2026 |
| John Kosiba | 0 | – | 14 | $5.6M | Jun 11, 2026 |
| Arthur H. House | 0 | – | 1 | $494K | Aug 8, 2025 |
| Laura A. Dambier | 0 | – | 1 | $151K | Jun 11, 2026 |
| David R. Oliver Jr. | 1 | $2K | 1 | $7K | Feb 24, 2026 |
| Margaret D. Klein | 1 | $3K | 0 | – | Aug 4, 2022 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 7.1% | 13G | Apr 17, 2025 | filing ↗ | |
| Vanguard Capital Management | 5.0% | 13G | Apr 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| John Kosiba | $254K | Jun 11, 2026 | filing ↗ |
| Daniel McGahn | $604K | Jun 11, 2026 | filing ↗ |
| Laura A. Dambier | $161K | Jun 10, 2026 | filing ↗ |
| John Kosiba | $202K | Jun 8, 2026 | filing ↗ |
| Daniel McGahn | $404K | Jun 8, 2026 | filing ↗ |
| Daniel McGahn | $630K | Jun 3, 2026 | filing ↗ |
| John Kosiba | $316K | Jun 3, 2026 | filing ↗ |
| John Kosiba | $1.5M | Jun 2, 2026 | filing ↗ |
| Daniel McGahn | $3.7M | Jun 2, 2026 | filing ↗ |
| Arthur H House | $493K | Aug 8, 2025 | filing ↗ |
| Daniel McGahn | $5.5M | Aug 4, 2025 | filing ↗ |
| John Kosiba | $2.7M | Aug 4, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | Jun 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 1, 2026 | filing ↗ |
| Earnings (2.02) | May 27, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 27, 2026 | filing ↗ |
| Earnings (2.02) | Feb 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 4, 2026 | filing ↗ |
| Other events (8.01) | Dec 23, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 23, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 5, 2025 | filing ↗ |
| Material agreement (1.01) | Dec 5, 2025 | filing ↗ |
| Acquisition or disposition (2.01) | Dec 5, 2025 | filing ↗ |
| Unregistered equity sale (3.02) | Dec 5, 2025 | filing ↗ |
| Other events (8.01) | Dec 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 5, 2025 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Earnings (2.02) | Jul 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 30, 2025 | filing ↗ |
| Shareholder vote (5.07) | Jul 25, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 25, 2025 | filing ↗ |