Who owns American Superconductor Corporation?
Institutional ownership of AMSC from SEC Form 13F filings across 187 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.
187
13F holders
$954.8M
value, 2026 filers
55.5%
of shares outstanding (23.9M sh)
38
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% | 9.5% | +2.8% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | $84.4M | 0.0% | 4.7% | -50.1% |
| 3 | UBS Group AG | 1.4M | $59.3M | 0.0% | 3.3% | +138.3% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.4M | $58.9M | 0.0% | 3.3% | -17.1% |
| 5 | GOLDMAN SACHS GROUP INC | 1.3M | $53.7M | 0.0% | 3% | +82.4% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 1.2M | $51.6M | 0.0% | 2.9% | +6.3% |
| 7 | FIRST TRUST ADVISORS LP | 1.2M | $48.5M | 0.0% | 2.7% | +50.1% |
| 8 | BAILLIE GIFFORD & CO | 933,308 | $38.7M | 0.0% | 2.2% | -35.5% |
| 9 | Legal & General Group Plc | 756,863 | $31.4M | 0.0% | 1.8% | +42.8% |
| 10 | MORGAN STANLEY | 635,833 | $26.4M | 0.0% | 1.5% | +0.3% |
| 11 | Nuveen, LLC | 628,406 | $26.1M | 0.0% | 1.5% | -38.4% |
| 12 | NORTHERN TRUST CORP | 433,792 | $18.0M | 0.0% | 1% | +10.3% |
| 13 | Sixth Street Partners Management Company, L.P.NEW | 399,125 | $16.6M | 2.9% | 0.9% | new |
| 14 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 399,125 | $16.6M | 0.0% | 0.9% | +3.6% |
| 15 | D. E. Shaw & Co., Inc. | 366,845 | $15.2M | 0.0% | 0.9% | -35.4% |
| 16 | BNP PARIBAS FINANCIAL MARKETS | 366,437 | $15.2M | 0.0% | 0.9% | -16.1% |
| 17 | PRICE T ROWE ASSOCIATES INC /MD/ | 343,867 | $14,274 | 0.0% | 0.8% | +486.7% |
| 18 | VANGUARD FIDUCIARY TRUST CO | 337,929 | $14.0M | 0.0% | 0.8% | +3.6% |
| 19 | HRT FINANCIAL LPNEW | 298,420 | $12,387 | 0.0% | 0.7% | new |
| 20 | Qube Research & Technologies Ltd | 250,573 | $10.4M | 0.0% | 0.6% | -23.9% |
| 21 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 235,235 | $9.8M | 0.0% | 0.5% | +280.6% |
| 22 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 230,903 | $9.6M | 0.0% | 0.5% | -48.3% |
| 23 | Invesco Ltd. | 180,660 | $7.5M | 0.0% | 0.4% | -25.0% |
| 24 | Russell Investments Group, Ltd. | 171,764 | $7.1M | 0.0% | 0.4% | +359.7% |
| 25 | JANE STREET GROUP, LLCNEW | 170,319 | $7.1M | 0.0% | 0.4% | new |
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.