Who owns AMERICAN SUPERCONDUCTOR CORP /DE/?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of AMSC from SEC Form 13F filings across 277 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 277 institutions disclosed 35.4M shares of AMERICAN SUPERCONDUCTOR CORP /DE/ worth $1.47B — about 76.9% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
277
13F holders
$1.47B
value, 2026 filers
76.9%
of shares outstanding (35.4M sh)
69
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of AMSC's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.1M | $170.0M | 0.0% | 8.9% | +2.8% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | $84.4M | 0.0% | 4.4% | -0.3% |
| 3 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | 1.7M | $70.7M | 0.2% | 3.7% | +49.5% |
| 4 | UBS Group AG | 1.4M | $59.3M | 0.0% | 3.1% | +138.3% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.4M | $58.9M | 0.0% | 3.1% | -17.1% |
| 6 | STATE STREET CORP | 1.4M | $56.4M | 0.0% | 3% | +7.7% |
| 7 | GOLDMAN SACHS GROUP INC | 1.3M | $53.7M | 0.0% | 2.8% | +82.4% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 1.2M | $51.6M | 0.0% | 2.7% | +6.3% |
| 9 | FIRST TRUST ADVISORS LP | 1.2M | $48.5M | 0.0% | 2.5% | +50.1% |
| 10 | OBERWEIS ASSET MANAGEMENT INC/ | 987,500 | $41.0M | 0.8% | 2.1% | +16.2% |
| 11 | AWM Investment Company, Inc. | 951,604 | $39.5M | 3.4% | 2.1% | +18.7% |
| 12 | BAILLIE GIFFORD & CO | 933,308 | $38.7M | 0.0% | 2% | -35.5% |
| 13 | EMERALD ADVISERS, LLC | 843,956 | $35.0M | 0.8% | 1.8% | +11.4% |
| 14 | Legal & General Group Plc | 756,863 | $31.4M | 0.0% | 1.6% | +42.8% |
| 15 | DIMENSIONAL FUND ADVISORS LP | 645,991 | $26.8M | 0.0% | 1.4% | -1.9% |
| 16 | MORGAN STANLEY | 635,833 | $26.4M | 0.0% | 1.4% | +0.3% |
| 17 | Nuveen, LLC | 628,406 | $26.1M | 0.0% | 1.4% | -38.4% |
| 18 | Telemark Asset Management, LLC | 600,000 | $24.9M | 1.8% | 1.3% | 0.0% |
| 19 | ROYCE & ASSOCIATES LP | 555,821 | $23.1M | 0.2% | 1.2% | +2.4% |
| 20 | EMERALD MUTUAL FUND ADVISERS TRUST | 538,955 | $22.4M | 0.8% | 1.2% | +22.8% |
| 21 | NORTHERN TRUST CORP | 433,792 | $18.0M | 0.0% | 0.9% | +10.3% |
| 22 | Ranger Investment Management, L.P.NEW | 405,266 | $16.8M | 1.1% | 0.9% | new |
| 23 | Stephens Investment Management Group LLC | 402,762 | $16.7M | 0.2% | 0.9% | +30.5% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 399,125 | $16.6M | 0.0% | 0.9% | +3.6% |
| 25 | PANAGORA ASSET MANAGEMENT INC | 375,515 | $15.6M | 0.0% | 0.8% | +46.5% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.