AMSC (American Superconductor Corp)
Insider Trading Activity
Every open-market purchase and sale reported by AMSC officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-12 | Laura A. Dambier | Director | Sell | — | — |
| 2026-06-11 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2026-06-11 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2026-06-10 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2026-06-10 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2026-06-03 | John W Kosiba JR | SVP, CFO & Treasurer | MIXED | — | — |
| 2026-06-03 | Daniel P McGahn | Chairman, President and CEO | MIXED | — | — |
| 2026-04-07 | Laura A. Dambier | Director | A | — | — |
| 2026-04-07 | Terence Robert Donnelly | Director | A | — | — |
| 2026-04-07 | DAVID R OLIVER JR | Director | A | — | — |
| 2026-04-07 | Barbara G. Littlefield | Director | A | — | — |
| 2026-04-07 | Arthur H House | Director | A | — | — |
| 2026-04-07 | Margaret D. Klein | Director | A | — | — |
| 2026-02-26 | DAVID R OLIVER JR | Director | Sell | — | — |
| 2025-11-13 | DAVID R OLIVER JR | Director | Buy | — | — |
| 2025-08-08 | Arthur H House | Director | MIXED | — | — |
| 2025-08-06 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2025-08-06 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2025-08-06 | Margaret D. Klein | Director | Buy | — | — |
| 2025-06-12 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2025-06-12 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2025-06-09 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2025-06-09 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2025-05-29 | Terence Robert Donnelly | Director | A | — | — |
| 2025-05-29 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2025-05-29 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2025-05-22 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2025-05-22 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2025-05-19 | John W Kosiba JR | SVP, CFO & Treasurer | A | — | — |
| 2025-05-19 | Daniel P McGahn | Chairman, President and CEO | A | — | — |
| 2025-04-04 | Laura A. Dambier | Director | A | — | — |
| 2025-04-04 | Arthur H House | Director | A | — | — |
| 2025-04-04 | Barbara G. Littlefield | Director | A | — | — |
| 2025-04-04 | DAVID R OLIVER JR | Director | A | — | — |
| 2025-04-04 | Margaret D. Klein | Director | A | — | — |
| 2024-11-06 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2024-10-01 | Daniel P McGahn | Chairman, President and CEO | A | — | — |
| 2024-09-30 | John W Kosiba JR | SVP, CFO & Treasurer | A | — | — |
| 2024-06-12 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2024-06-12 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2024-05-23 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2024-05-23 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2024-04-04 | Barbara G. Littlefield | Director | A | — | — |
| 2024-04-04 | DAVID R OLIVER JR | Director | A | — | — |
| 2024-04-04 | Arthur H House | Director | A | — | — |
| 2024-04-04 | Margaret D. Klein | Director | A | — | — |
| 2024-04-04 | Laura A. Dambier | Director | A | — | — |
| 2023-06-23 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | — | — |
| 2023-06-23 | Daniel P McGahn | Chairman, President and CEO | Sell | — | — |
| 2023-06-20 | Daniel P McGahn | Chairman, President and CEO | MIXED | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 1,490,795 | — |
| — | Chairman, President and CEO | 1,145,273 | — |
| — | 10%+ Owner | 792,886 | — |
| — | 10%+ Owner | 792,635 | — |
| — | 10%+ Owner | 535,848 | — |
| — | 10%+ Owner | 474,317 | — |
| — | SVP, CFO & Treasurer | 334,748 | — |
| — | EVP, CFO & Treasurer | 99,132 | — |
| — | EVP, Operations | 88,330 | — |
| — | Director | 63,823 | — |
| — | Director | 59,299 | — |
| — | Director | 51,779 | — |
| — | Director | 35,427 | — |
| — | EVP, Windtec Solutions | 20,013 | — |
| — | Director | 19,492 | — |
| — | Chairman and CEO | 17,701 | — |
| — | SVP, Corporate Administration | 15,153 | — |
| — | Director | 14,992 | — |
| — | Director | 11,860 | — |
| — | EVP & Chief Technical Officer | 8,339 | — |
| — | Director | 8,339 | — |
| — | Director | 8,039 | — |
| — | Director | 7,600 | — |
| — | EVP & GM, AMSC Power Systems | 7,008 | — |
| — | Director | 6,639 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the AMSC quote page; the site-wide leaderboard is on the insider transactions hub.