AMSC insider buying and SEC filings, explained
American Superconductor Corp. · CIK 880807
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$157K
Planned sales (10b5-1)
$7.6M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Jun 11, 2026 | Sale | Laura A. Dambier (Director) sold 4,000 shares at $37.63 ($151K). Holdings down 21% to 14,992 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 12, 2026 |
| Jun 11, 2026 | Planned (10b5-1) | John W Kosiba JR (CFO) sold 6,769 shares at about $37.46 ($254K), marked as a 10b5-1 plan trade. Holdings down 2% to 334,377 shares. | SEC filing Filed Jun 11, 2026 |
| Jun 11, 2026 | Planned (10b5-1) | Daniel P McGahn (CEO and Director) sold 16,117 shares at about $37.44 ($603K), marked as a 10b5-1 plan trade. Holdings down 1% to 1,131,929 shares. | SEC filing Filed Jun 11, 2026 |
| Jun 8, 2026 | Planned (10b5-1) | John W Kosiba JR (CFO) sold 4,835 shares at about $41.77 ($202K), marked as a 10b5-1 plan trade. Holdings down 1% to 341,146 shares. | SEC filing Filed Jun 10, 2026 |
| Jun 8, 2026 | Planned (10b5-1) | Daniel P McGahn (CEO and Director) sold 9,670 shares at about $41.78 ($404K), marked as a 10b5-1 plan trade. Holdings down 1% to 1,148,046 shares. | SEC filing Filed Jun 10, 2026 |
| Jun 2–3, 2026 | Planned (10b5-1) | John W Kosiba JR (CFO) sold 36,909 shares between Jun 2 and Jun 3 at about $50.45 ($1.9M), marked as a 10b5-1 plan trade. Holdings down 10% to 345,981 shares. | SEC filing Filed Jun 3, 2026 |
| Jun 2–3, 2026 | Planned (10b5-1) | Daniel P McGahn (CEO and Director) sold 85,418 shares between Jun 2 and Jun 3 at about $50.49 ($4.3M), marked as a 10b5-1 plan trade. Holdings down 7% to 1,157,716 shares. | SEC filing Filed Jun 3, 2026 |
| Feb 24, 2026 | Sale | David R. Oliver Jr. (Director) sold 200 shares at $34.10 ($7K). Holdings down <1% to 60,707 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 26, 2026 |
| Jun 18, 2019 | Purchase (code P) | David R. Oliver Jr. (Director) bought 200 shares at $8.33 ($2K), reported as a purchase (code P). Holdings up <1% to 60,907 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 13, 2025 |
9 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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