AMSC American Superconductor Corporation
American Superconductor Corporation (AMSC) Institutional Ownership
What the institutions did with AMSC last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 4.1M | 11.6% |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | 5.7% |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | 1.7M | 4.8% |
| UBS Group AG | 1.4M | 4.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.4M | 4.0% |
| STATE STREET CORP | 1.4M | 3.8% |
| GOLDMAN SACHS GROUP INC | 1.3M | 3.7% |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2M | 3.5% |
| FIRST TRUST ADVISORS LP | 1.2M | 3.3% |
| OBERWEIS ASSET MANAGEMENT INC/ | 987.5K | 2.8% |
| AWM Investment Company, Inc. | 951.6K | 2.7% |
| BAILLIE GIFFORD & CO | 933.3K | 2.6% |
| EMERALD ADVISERS, LLC | 844.0K | 2.4% |
| Legal & General Group Plc | 756.9K | 2.1% |
| DIMENSIONAL FUND ADVISORS LP | 646.0K | 1.8% |
| MORGAN STANLEY | 635.8K | 1.8% |
| Nuveen, LLC | 628.4K | 1.8% |
| Telemark Asset Management, LLC | 600.0K | 1.7% |
| ROYCE & ASSOCIATES LP | 555.8K | 1.6% |
| EMERALD MUTUAL FUND ADVISERS TRUST | 539.0K | 1.5% |
| NORTHERN TRUST CORP | 433.8K | 1.2% |
| Ranger Investment Management, L.P. | 405.3K | 1.1% |
| Stephens Investment Management Group LLC | 402.8K | 1.1% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 399.1K | 1.1% |
| PANAGORA ASSET MANAGEMENT INC | 375.5K | 1.1% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| UBS Group AG | Increased | 599.8K | 1.4M | +829.3K |
| GOLDMAN SACHS GROUP INC | Increased | 709.5K | 1.3M | +584.5K |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | Increased | 1.1M | 1.7M | +564.2K |
| BAILLIE GIFFORD & CO | Reduced | 1.4M | 933.3K | -514.1K |
| Ranger Investment Management, L.P. | New | 0 | 405.3K | +405.3K |
| Hood River Capital Management LLC | Sold Out | 398.7K | 0 | -398.7K |
| Nuveen, LLC | Reduced | 1.0M | 628.4K | -392.5K |
| FIRST TRUST ADVISORS LP | Increased | 778.3K | 1.2M | +390.2K |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | Sold Out | 379.5K | 0 | -379.5K |
| T. Rowe Price Investment Management, Inc. | New | 0 | 306.2K | +306.2K |
| HRT FINANCIAL LP | New | 0 | 298.4K | +298.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 1.7M | 1.4M | -292.8K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 58.6K | 343.9K | +285.3K |
| Portolan Capital Management, LLC | Reduced | 295.6K | 29.3K | -266.3K |
| Legal & General Group Plc | Increased | 530.1K | 756.9K | +226.7K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Reduced | 446.8K | 230.9K | -215.8K |
| D. E. Shaw & Co., Inc. | Reduced | 567.6K | 366.8K | -200.7K |
| CITADEL ADVISORS LLC | Reduced | 216.7K | 20.5K | -196.2K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 61.8K | 235.2K | +173.4K |
| JANE STREET GROUP, LLC | New | 0 | 170.3K | +170.3K |
| AWM Investment Company, Inc. | Increased | 801.6K | 951.6K | +150.0K |
| SEI INVESTMENTS CO | Reduced | 224.4K | 85.2K | -139.2K |
| OBERWEIS ASSET MANAGEMENT INC/ | Increased | 849.9K | 987.5K | +137.6K |
| FMR LLC | Reduced | 147.3K | 10.4K | -136.9K |
| ALGERT GLOBAL LLC | Reduced | 490.0K | 353.8K | -136.1K |
| Russell Investments Group, Ltd. | Increased | 37.4K | 171.8K | +134.4K |
| PANAGORA ASSET MANAGEMENT INC | Increased | 256.4K | 375.5K | +119.1K |
| BlackRock, Inc. | Increased | 4.0M | 4.1M | +112.7K |
| BANK OF AMERICA CORP /DE/ | Reduced | 209.5K | 106.2K | -103.2K |
| AXIOM INVESTORS LLC /DE | Sold Out | 100.8K | 0 | -100.8K |
| EMERALD MUTUAL FUND ADVISERS TRUST | Increased | 438.9K | 539.0K | +100.1K |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | New | 0 | 100.0K | +100.0K |
| STATE STREET CORP | Increased | 1.3M | 1.4M | +97.2K |
| Stephens Investment Management Group LLC | Increased | 308.5K | 402.8K | +94.2K |
| MACKENZIE FINANCIAL CORP | Increased | 77.5K | 164.5K | +86.9K |
| EMERALD ADVISERS, LLC | Increased | 757.4K | 844.0K | +86.6K |
| WELLINGTON MANAGEMENT GROUP LLP | New | 0 | 85.2K | +85.2K |
| Holocene Advisors, LP | Increased | 12.1K | 95.7K | +83.6K |
| Qube Research & Technologies Ltd | Reduced | 329.4K | 250.6K | -78.8K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 169.0K | 90.3K | -78.7K |
| Maxi Investments CY Ltd | Sold Out | 75.8K | 0 | -75.8K |
| Balyasny Asset Management L.P. | Reduced | 144.1K | 68.8K | -75.3K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 1.2M | 1.2M | +74.0K |
| Cambridge Investment Research Advisors, Inc. | Increased | 48.6K | 121.1K | +72.6K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 436.7K | 366.4K | -70.3K |
| BROWN CAPITAL MANAGEMENT LLC | New | 0 | 68.2K | +68.2K |
| KENNEDY CAPITAL MANAGEMENT LLC | Sold Out | 66.2K | 0 | -66.2K |
| Boston Partners | Sold Out | 66.1K | 0 | -66.1K |
| Invesco Ltd. | Reduced | 240.8K | 180.7K | -60.1K |
| Tidal Investments LLC | Increased | 43.4K | 101.3K | +58.0K |
| Defiance ETFs, LLC | Increased | 42.2K | 99.4K | +57.2K |
| Janney Montgomery Scott LLC | Sold Out | 56.9K | 0 | -56.9K |
| LAZARD ASSET MANAGEMENT LLC | Sold Out | 56.5K | 0 | -56.5K |
| MARSHALL WACE, LLP | New | 0 | 53.3K | +53.3K |
| AMERIPRISE FINANCIAL INC | Increased | 62.3K | 111.9K | +49.5K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Reduced | 43.5K | 181 | -43.3K |
| Covestor Ltd | Increased | 4 | 41.3K | +41.3K |
| NORTHERN TRUST CORP | Increased | 393.2K | 433.8K | +40.6K |
| SG Americas Securities, LLC | Sold Out | 35.4K | 0 | -35.4K |
| Polymer Capital Management (US) LLC | New | 0 | 34.5K | +34.5K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.