AMSC · Insider Trading
American Superconductor Corp
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-21 | Barbara G. Littlefield | Director | A | +1,607 | — |
| 2026-06-12 | Laura A. Dambier | Director | Sell | −4,000 | −$150.52K |
| 2026-06-11 | Daniel P McGahn | Chairman, President and CEO | Sell | −16,117 | −$603.50K |
| 2026-06-11 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −6,769 | −$253.58K |
| 2026-06-10 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −4,835 | −$201.97K |
| 2026-06-10 | Daniel P McGahn | Chairman, President and CEO | Sell | −9,670 | −$404.00K |
| 2026-06-03 | John W Kosiba JR | SVP, CFO & Treasurer | MIXED | −6,909 | −$1.86M |
| 2026-06-03 | Daniel P McGahn | Chairman, President and CEO | MIXED | −25,418 | −$4.31M |
| 2026-04-07 | Laura A. Dambier | Director | A | +3,116 | — |
| 2026-04-07 | Terence Robert Donnelly | Director | A | +2,665 | — |
| 2026-04-07 | David R Oliver Jr | Director | A | +3,116 | — |
| 2026-04-07 | Barbara G. Littlefield | Director | A | +3,116 | — |
| 2026-04-07 | Arthur H House | Director | A | +3,116 | — |
| 2026-04-07 | Margaret D. Klein | Director | A | +3,116 | — |
| 2026-02-26 | David R Oliver Jr | Director | Sell | −200 | −$6.82K |
| 2025-11-13 | David R Oliver Jr | Director | Buy | +200 | +$1.67K |
| 2025-08-08 | Arthur H House | Director | MIXED | — | −$428.10K |
| 2025-08-06 | Daniel P McGahn | Chairman, President and CEO | Sell | −100,848 | −$5.50M |
| 2025-08-06 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −59,843 | −$3.27M |
| 2025-08-06 | Margaret D. Klein | Director | Buy | +500 | +$2.78K |
| 2025-06-12 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −6,642 | −$189.78K |
| 2025-06-12 | Daniel P McGahn | Chairman, President and CEO | Sell | −12,815 | −$366.24K |
| 2025-06-09 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −4,744 | −$151.01K |
| 2025-06-09 | Daniel P McGahn | Chairman, President and CEO | Sell | −7,689 | −$244.67K |
| 2025-05-29 | Terence Robert Donnelly | Director | A | +2,112 deriv. | — |
| 2025-05-29 | Daniel P McGahn | Chairman, President and CEO | Sell | −122,655 | −$3.24M |
| 2025-05-29 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −50,000 | −$1.32M |
| 2025-05-22 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −11,860 | −$290.53K |
| 2025-05-22 | Daniel P McGahn | Chairman, President and CEO | Sell | −12,815 | −$313.88K |
| 2025-05-19 | John W Kosiba JR | SVP, CFO & Treasurer | A | +120,000 | — |
| 2025-05-19 | Daniel P McGahn | Chairman, President and CEO | A | +240,000 | — |
| 2025-04-04 | Laura A. Dambier | Director | A | +2,639 | — |
| 2025-04-04 | Arthur H House | Director | A | +2,639 | — |
| 2025-04-04 | Barbara G. Littlefield | Director | A | +2,639 | — |
| 2025-04-04 | David R Oliver Jr | Director | A | +2,639 | — |
| 2025-04-04 | Margaret D. Klein | Director | A | +2,639 | — |
| 2024-11-06 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −50,000 | −$1.41M |
| 2024-10-01 | Daniel P McGahn | Chairman, President and CEO | A | +180,000 | — |
| 2024-09-30 | John W Kosiba JR | SVP, CFO & Treasurer | A | +90,000 | — |
| 2024-06-12 | Daniel P McGahn | Chairman, President and CEO | Sell | −37,165 | −$806.05K |
| 2024-06-12 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −32,000 | −$693.75K |
| 2024-05-23 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −29,000 | −$429.81K |
| 2024-05-23 | Daniel P McGahn | Chairman, President and CEO | Sell | −20,559 | −$304.74K |
| 2024-04-04 | Barbara G. Littlefield | Director | A | +3,840 | — |
| 2024-04-04 | David R Oliver Jr | Director | A | +3,840 | — |
| 2024-04-04 | Arthur H House | Director | A | +3,840 | — |
| 2024-04-04 | Margaret D. Klein | Director | A | +3,840 | — |
| 2024-04-04 | Laura A. Dambier | Director | A | +3,840 | — |
| 2023-06-23 | John W Kosiba JR | SVP, CFO & Treasurer | Sell | −80,010 | −$486.35K |
| 2023-06-23 | Daniel P McGahn | Chairman, President and CEO | Sell | −110,704 | −$672.95K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Daniel P McGahn | Chairman, President and CEO | 1,145,273 | $29.34M |
| John W Kosiba JR | SVP, CFO & Treasurer | 334,748 | $8.58M |
| David R Oliver Jr | Director | 63,823 | $1.64M |
| Arthur H House | Director | 51,779 | $1.33M |
| Barbara G. Littlefield | Director | 37,034 | $948.81K |
| Margaret D. Klein | Director | 19,492 | $499.39K |
| Laura A. Dambier | Director | 14,992 | $384.10K |
| Terence Robert Donnelly | Director | 2,665 | $68.28K |
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.
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.