American Superconductor
AMSC · NASDAQ
$25.70+$0.02 (+0.08%)TodayMarket closed ·
Prev close $25.68
Who owns AMSC
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 33.7% of AMSC’s shares.
- BlackRock Institutional Trust Company, N.A.7.2%
- Vanguard Capital Management, LLC4.2%
- Barrow Hanley Global Investors3.5%
- Vanguard Portfolio Management, LLC2.9%
- Next 6 largest institutions15.9%
- All other shareholders66.3%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 3.47M | 7.15% |
| Vanguard Capital Management, LLC | 2.03M | 4.20% |
| Barrow Hanley Global Investors | 1.70M | 3.52% |
| Vanguard Portfolio Management, LLC | 1.42M | 2.93% |
| UBS Financial Services, Inc. | 1.40M | 2.89% |
| Emerald Advisers LLC | 1.38M | 2.85% |
| State Street Investment Management (US) | 1.36M | 2.80% |
| Geode Capital Management, L.L.C. | 1.24M | 2.57% |
| First Trust Advisors L.P. | 1.17M | 2.41% |
| McGahn (Daniel P) | 1.15M | 2.36% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 1.44M | 2.98% |
| iShares Russell 2000 ETF | 1.22M | 2.51% |
| Oberweis Micro-Cap Fund | 925.30K | 1.91% |
| First Trust NASDAQ Cln Edge Smart Grid Infra Ix Fd | 642.35K | 1.33% |
| Vanguard Extended Market Index Fund | 547.80K | 1.13% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $7.79M (24 trades) of AMSC on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Littlefield Barbara G. | Award | 1.61K | — |
| Dambier Laura A. | Sale | 4.00K | $150.52K |
| Kosiba John W JR | Sale | 1.74K | $65.98K |
| Kosiba John W JR | Sale | 5.03K | $187.60K |
| McGahn Daniel P | Sale | 4.61K | $174.46K |
| McGahn Daniel P | Sale | 11.51K | $429.05K |
| Kosiba John W JR | Sale | 1.55K | $65.60K |
| Kosiba John W JR | Sale | 3.29K | $136.37K |
| McGahn Daniel P | Sale | 4.68K | $197.38K |
| McGahn Daniel P | Sale | 4.99K | $206.61K |
Short interest
Settled Sep 30, 2026
- Shares short
- 3.90M
- Days to cover
- 5.37
- % of shares outstanding
- 8.04%
- Average daily volume
- 724.86K
- Change since last report
- −0.9%
Information on this page is provided for informational purposes only and is not a recommendation to buy, sell or hold any security. Investing involves risk, including possible loss of principal. Market data is delayed at least 15 minutes and is provided without warranty. Analyst ratings, price targets and company data come from third-party sources. Past performance does not guarantee future results.