AMSC: American Superconductor Corp insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-07-31 | Fell below 5% | Vanguard Capital Management | 4.93% | SEC |
Institutional ownership (Q2 2026)
278 institutions reported holding $1.44B of American Superconductor Corp on Form 13F (246 the quarter before). 62 opened a new position and 30 sold out. Shares held by institutions: +7%.
| Largest holders | Shares | Value |
|---|---|---|
| BlackRock, Inc. | 4,095,371 | $170.00M |
| VANGUARD CAPITAL MANAGEMENT LLC | 2,034,219 | $84.44M |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | 1,704,006 | $70.73M |
| UBS Group AG | 1,429,090 | $59.32M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1,418,863 | $58.90M |
| STATE STREET CORP | 1,358,225 | $56.38M |
| GOLDMAN SACHS GROUP INC | 1,294,047 | $53.72M |
| GEODE CAPITAL MANAGEMENT, LLC | 1,243,198 | $51.62M |
| FIRST TRUST ADVISORS LP | 1,168,424 | $48.50M |
| OBERWEIS ASSET MANAGEMENT INC/ | 987,500 | $40.99M |
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