AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC) Insider Transactions
AMSC Insider Buying & Selling Activity
Between Aug 8, 2025 and Jun 11, 2026, 5 insiders at AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC) reported 11 transactions on record: 0 purchases and 11 sales. In total, insiders bought $0 and sold $8.29M, a net selling position of $8.29M. 3 insiders also sold within a 30-day window around Jun 11, 2026.
Multiple insiders trading the same direction in a short window is generally read as a stronger signal than any single trade alone.
| Date | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| Jun 2, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 72.5K | $3.68M |
| Jun 2, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sale | 30.5K | $1.55M |
| Jun 3, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 12.9K | $630.3K |
| Jun 11, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 16.1K | $603.5K |
| Aug 8, 2025 | House Arthur H | Director | Sale | 9.7K | $494.1K |
Every insider with activity on record, most recently active first.
| Insider | Role | Last Activity | Date | Latest Known Holding |
|---|---|---|---|---|
| Kosiba John W JR | SVP, CFO & Treasurer | Sale | Jun 11, 2026 | 334.4K |
| McGahn Daniel P | Chairman, President and CEO | Sale | Jun 11, 2026 | 1.13M |
| Dambier Laura A. | Director | Sale | Jun 11, 2026 | 15.0K |
| OLIVER DAVID R JR | Director | Sale | Feb 24, 2026 | 60.7K |
| House Arthur H | Director | Sale | Aug 8, 2025 | 48.7K |
Every purchase and sale on record, deduplicated. "52w range" shows where that price sat in the trailing year at the time, and "Since" shows the paper return from that price to today.
| Date | Insider | Role | Type | Shares | Price | Value | 52w Range | Since |
|---|---|---|---|---|---|---|---|---|
| Jun 11, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 16.1K | $37.45 | $603.5K | 33% | -23.9% |
| Jun 11, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sale | 6.8K | $37.46 | $253.6K | 33% | -23.9% |
| Jun 11, 2026 | Dambier Laura A. | Director | Sale | 4.0K | $37.63 | $150.5K | 33% | -24.3% |
| Jun 8, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 9.7K | $41.78 | $404.0K | 43% | -31.8% |
| Jun 8, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sale | 4.8K | $41.77 | $202.0K | 43% | -31.8% |
| Jun 3, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 12.9K | $48.88 | $630.3K | 51% | -41.7% |
| Jun 3, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sale | 6.4K | $48.94 | $315.5K | 51% | -41.8% |
| Jun 2, 2026 | McGahn Daniel P | Chairman, President and CEO | Sale | 72.5K | $50.78 | $3.68M | 62% | -43.9% |
| Jun 2, 2026 | Kosiba John W JR | SVP, CFO & Treasurer | Sale | 30.5K | $50.77 | $1.55M | 62% | -43.9% |
| Feb 24, 2026 | OLIVER DAVID R JR | Director | Sale | 200 | $34.10 | $6.8K | 35% | -16.5% |
| Aug 8, 2025 | House Arthur H | Director | Sale | 9.7K | $50.92 | $494.1K | 86% | -44.0% |
52w range and paper return are only computed for transactions with a date that lines up with price history on record.
Are insiders buying or selling AMSC stock?
On record between Aug 8, 2025 and Jun 11, 2026, AMERICAN SUPERCONDUCTOR CORP /DE/ insiders made 0 purchases ($0) and 11 sales ($8.29M), a net selling position of $8.29M.
Has there been cluster buying or selling at AMSC?
No buying clusters (2+ insiders within 30 days) on record. 3 insiders sold within 30 days around Jun 11, 2026.
What is the largest recent insider transaction at AMSC?
The largest transaction on record is McGahn Daniel P (Chairman, President and CEO), a sale of $3.68M on Jun 2, 2026.
Does a 10b5-1 automatic trading plan explain AMSC's insider sales?
This data does not indicate whether a given sale was part of a pre-scheduled Rule 10b5-1 plan, that detail is not captured in the transaction data available here.