AMERICAN SUPERCONDUCTOR CORP (AMSC)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
271
Reporting holders
$1.5B
Reported value
71.6%
Of shares outstanding
5.7%
Held as options
+36
Holder change
Institutions report 34,671,152 shares against 48,442,143 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $170.0M | 4,095,371 | 0.00% | 8q | +2.8%+$4.7M |
| VANGUARD CAPITAL MANAGEMENT LLC | $84.4M | 2,034,219 | 0.00% | 2q | HELD |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | $70.7M | 1,704,006 | 0.21% | 2q | +49.5%+$23.4M |
| UBS Group AG | $59.3M | 1,429,090 | 0.01% | 31q | +138.3%+$34.4M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $58.9M | 1,418,863 | 0.00% | 2q | -17.1%-$12.2M |
| STATE STREET CORP | $56.4M | 1,358,225 | 0.00% | 29q | +7.7%+$4.0M |
| GOLDMAN SACHS GROUP INC | $53.7M | 1,294,047 | 0.00% | 12q | +82.4%+$24.3M |
| GEODE CAPITAL MANAGEMENT, LLC | $51.6M | 1,243,198 | 0.00% | 31q | +6.3%+$3.1M |
| FIRST TRUST ADVISORS LP | $48.5M | 1,168,424 | 0.03% | 31q | +50.1%+$16.2M |
| OBERWEIS ASSET MANAGEMENT INC/ | $41.0M | 987,500 | 0.85% | 11q | +16.2%+$5.7M |
| JANE STREET GROUP, LLC | $40.0M | 170,319 | 0.00% | 11q | HELD |
| AWM Investment Company, Inc. | $39.5M | 951,604 | 3.43% | 31q | +18.7%+$6.2M |
| BAILLIE GIFFORD & CO | $38.7M | 933,308 | 0.04% | 24q | -35.5%-$21.3M |
| EMERALD ADVISERS, LLC | $35.0M | 843,956 | 0.82% | 7q | +11.4%+$3.6M |
| Legal & General Group Plc | $31.4M | 756,863 | 0.01% | 9q | +42.8%+$9.4M |
| DIMENSIONAL FUND ADVISORS LP | $26.8M | 645,991 | 0.00% | 31q | -1.9%-$510.7K |
| MORGAN STANLEY | $26.4M | 635,833 | 0.00% | 35q | HELD |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $26.1M | 235,235 | 0.00% | 31q | +280.6%+$19.2M |
| Nuveen, LLC | $26.1M | 628,406 | 0.01% | 6q | -38.4%-$16.3M |
| Telemark Asset Management, LLC | $24.9M | 600,000 | 1.80% | 10q | HELD |
| ROYCE & ASSOCIATES LP | $23.1M | 555,821 | 0.19% | 31q | +2.4%+$541.4K |
| EMERALD MUTUAL FUND ADVISERS TRUST | $22.4M | 538,955 | 0.79% | 7q | +22.8%+$4.2M |
| NORTHERN TRUST CORP | $18.0M | 433,792 | 0.00% | 31q | +10.3%+$1.7M |
| CITADEL ADVISORS LLC | $17.8M | 20,528 | 0.00% | 31q | -90.5%-$170.4M |
| Ranger Investment Management, L.P. | $16.8M | 405,266 | 1.06% | new | NEW |
| Stephens Investment Management Group LLC | $16.7M | 402,762 | 0.18% | 4q | +30.5%+$3.9M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $16.6M | 399,125 | 0.00% | 14q | +3.6%+$569.1K |
| Sixth Street Partners Management Company, L.P. | $16.6M | 399,125 | 0.00% | new | NEW |
| PANAGORA ASSET MANAGEMENT INC | $15.6M | 375,515 | 0.05% | 8q | +46.5%+$4.9M |
| D. E. Shaw & Co., Inc. | $15.2M | 366,845 | 0.01% | 31q | -35.4%-$8.3M |
| BNP PARIBAS FINANCIAL MARKETS | $15.2M | 366,437 | 0.01% | 9q | -16.1%-$2.9M |
| ALGERT GLOBAL LLC | $14.7M | 353,832 | 0.17% | 7q | -63.9%-$26.0M |
| VANGUARD FIDUCIARY TRUST CO | $14.0M | 337,929 | 0.00% | 2q | +3.6%+$493.4K |
| IMC-Chicago, LLC | $13.8M | 12,020 | 0.00% | 11q | HELD |
| Qube Research & Technologies Ltd | $10.4M | 250,573 | 0.01% | 13q | -23.9%-$3.3M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $9.6M | 230,903 | 0.00% | 5q | -48.3%-$9.0M |
| ESSEX INVESTMENT MANAGEMENT CO LLC | $9.2M | 221,933 | 1.21% | 12q | -2.5%-$233.5K |
| AQR CAPITAL MANAGEMENT LLC | $8.1M | 194,477 | 0.00% | 8q | +5.3%+$403.6K |
| Invesco Ltd. | $7.5M | 180,660 | 0.00% | 31q | -25.0%-$2.5M |
| Russell Investments Group, Ltd. | $7.1M | 171,764 | 0.01% | 8q | +359.7%+$5.6M |
| MACKENZIE FINANCIAL CORP | $6.8M | 164,450 | 0.01% | 5q | +112.1%+$3.6M |
| ArrowMark Colorado Holdings LLC | $6.6M | 159,432 | 0.28% | 24q | +17.7%+$996.2K |
| Baird Financial Group, Inc. | $6.5M | 157,203 | 0.01% | 7q | -3.7%-$251.3K |
| Palisades Investment Partners, LLC | $6.5M | 156,720 | 1.85% | 9q | +2.7%+$172.0K |
| JPMORGAN CHASE & CO | $6.0M | 149,502 | 0.00% | 10q | +9.2%+$511.4K |
| Bank of New York Mellon Corp | $6.0M | 143,968 | 0.00% | 31q | +6.8%+$381.0K |
| Allspring Global Investments Holdings, LLC | $5.2M | 130,622 | 0.01% | 8q | -12.7%-$757.6K |
| RAYMOND JAMES FINANCIAL INC | $4.9M | 118,801 | 0.00% | 7q | -4.2%-$214.3K |
| AMERIPRISE FINANCIAL INC | $4.6M | 111,856 | 0.00% | 4q | -10.3%-$532.0K |
| GMT Capital Corp | $4.5M | 108,066 | 0.23% | 2q | HELD |
| BANK OF AMERICA CORP /DE/ | $4.4M | 106,216 | 0.00% | 31q | -49.3%-$4.3M |
| Tidal Investments LLC | $4.2M | 101,341 | 0.01% | 4q | +133.7%+$2.4M |
| MILLENNIUM MANAGEMENT LLC | $4.2M | 100,762 | 0.00% | 23q | -0.8%-$33.8K |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $4.2M | 100,026 | 0.03% | new | NEW |
| TWO SIGMA INVESTMENTS, LP | $4.0M | 90,340 | 0.00% | 13q | -46.5%-$3.5M |
| Holocene Advisors, LP | $4.0M | 95,716 | 0.01% | 2q | +689.2%+$3.5M |
| Defiance ETFs, LLC | $4.0M | 99,395 | 0.05% | 2q | +135.4%+$2.3M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $3.8M | 91,267 | 0.00% | 8q | +3.3%+$119.6K |
| Swiss National Bank | $3.7M | 88,600 | 0.00% | 8q | -0.6%-$20.8K |
| GROUP ONE TRADING LLC | $3.6M | 13,622 | 0.01% | 25q | +10.9%+$357.2K |
| ALPS ADVISORS INC | $3.6M | 86,387 | 0.02% | 10q | HELD |
| WELLINGTON MANAGEMENT GROUP LLP | $3.5M | 85,244 | 0.00% | new | NEW |
| SEI INVESTMENTS CO | $3.5M | 85,215 | 0.00% | 9q | -62.0%-$5.8M |
| WELLS FARGO & COMPANY/MN | $3.5M | 83,306 | 0.00% | 31q | -28.4%-$1.4M |
| RICE HALL JAMES & ASSOCIATES, LLC | $3.3M | 78,620 | 0.16% | 9q | +66.9%+$1.3M |
| SIMPLEX TRADING, LLC | $3.3M | 16,533 | 0.00% | 2q | HELD |
| Lumbard & Kellner, LLC | $3.1M | 74,139 | 0.93% | 5q | +0.6%+$19.5K |
| NEW YORK STATE COMMON RETIREMENT FUND | $3.0M | 72,900 | 0.00% | 10q | +3.6%+$103.8K |
| Merit Financial Group, LLC | $2.9M | 70,942 | 0.01% | 15q | +92.2%+$1.4M |
| Balyasny Asset Management L.P. | $2.9M | 68,847 | 0.00% | 3q | -52.2%-$3.1M |
| BROWN CAPITAL MANAGEMENT LLC | $2.8M | 68,156 | 0.57% | new | NEW |
| CAMPBELL NEWMAN ASSET MANAGEMENT INC | $2.8M | 67,337 | 0.21% | 7q | +4.7%+$124.5K |
| RHUMBLINE ADVISERS | $2.6M | 63,572 | 0.00% | 13q | +6.5%+$161.4K |
| Amundi | $2.6M | 63,251 | 0.00% | 7q | +8.7%+$211.0K |
| LPL Financial LLC | $2.4M | 57,385 | 0.00% | 13q | -34.3%-$1.2M |
| MARSHALL WACE, LLP | $2.2M | 53,261 | 0.00% | new | NEW |
| DEUTSCHE BANK AG\ | $2.2M | 51,992 | 0.00% | 9q | +21.1%+$376.7K |
| Hennion & Walsh Asset Management, Inc. | $1.9M | 46,020 | 0.05% | 5q | +38.0%+$525.7K |
| ALLIANCEBERNSTEIN L.P. | $1.9M | 54,720 | 0.00% | 9q | +23.2%+$348.7K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $1.8M | 42,728 | 0.00% | 8q | +10.1%+$163.0K |
| Legato Capital Management LLC | $1.7M | 41,369 | 0.14% | 12q | +3.1%+$51.8K |
| NISSAY ASSET MANAGEMENT CORP /JAPAN | $1.6M | 37,914 | 0.01% | 4q | +49.3%+$520.0K |
| Quadrature Capital Ltd | $1.6M | 37,682 | 0.01% | 2q | -3.7%-$60.5K |
| ROYAL BANK OF CANADA | $1.5M | 35,656 | 0.00% | 31q | +13.8%+$179.3K |
| Polymer Capital Management (US) LLC | $1.4M | 34,521 | 0.19% | new | NEW |
| Quantum Private Wealth, LLC | $1.4M | 33,823 | 0.36% | 7q | +8.3%+$107.9K |
| Focus Partners Wealth | $1.4M | 33,671 | 0.00% | 4q | +1.2%+$17.0K |
| FRANKLIN RESOURCES INC | $1.4M | 33,360 | 0.00% | 8q | +13.2%+$161.1K |
| TRUIST FINANCIAL CORP | $1.4M | 32,700 | 0.00% | 7q | HELD |
| CITIGROUP INC | $1.4M | 32,598 | 0.00% | 12q | +566.8%+$1.2M |
| VANGUARD ASSET MANAGEMENT, Ltd | $1.4M | 32,589 | 0.00% | 2q | +11.3%+$137.0K |
| Mitsubishi UFJ Asset Management Co., Ltd. | $1.3M | 32,145 | 0.00% | 11q | +149.2%+$798.9K |
| Aquatic Capital Management LLC | $1.3M | 32,081 | 0.05% | new | NEW |
| KORNITZER CAPITAL MANAGEMENT INC /KS | $1.3M | 31,669 | 0.03% | 5q | -9.4%-$137.1K |
| XTX Topco Ltd | $1.3M | 30,848 | 0.02% | new | NEW |
| OPPENHEIMER & CO INC | $1.2M | 30,060 | 0.01% | 2q | +18.9%+$198.3K |
| Portolan Capital Management, LLC | $1.2M | 29,314 | 0.05% | 2q | -90.1%-$11.1M |
| VIRTUS ADVISERS, LLC | $1.2M | 28,501 | 0.45% | 5q | +3.8%+$43.5K |
| HighTower Advisors, LLC | $1.2M | 28,498 | 0.00% | 5q | -34.1%-$613.1K |
| MetLife Investment Management, LLC | $1.1M | 27,526 | 0.01% | 4q | +7.1%+$76.2K |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-07-31 | 13G/A | Vanguard Capital Management | 4.9% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 271 | $1.5B | 34,671,152 | 61 | 100 | 73 | 5.7% |
| Q1 2026 | 235 | $1.2B | 33,474,129 | 46 | 94 | 59 | 4.2% |
| Q4 2025 | 230 | $999.6M | 33,007,658 | 34 | 95 | 62 | 6.1% |
| Q3 2025 | 262 | $2.1B | 32,608,442 | 69 | 81 | 76 | 6.4% |
| Q2 2025 | 216 | $1.3B | 32,708,096 | 58 | 89 | 42 | 9.6% |
| Q1 2025 | 185 | $530.3M | 27,464,977 | 35 | 55 | 58 | 6.4% |
| Q4 2024 | 182 | $732.3M | 27,195,146 | 38 | 54 | 48 | 8.7% |
| Q3 2024 | 166 | $692.0M | 27,105,662 | 44 | 46 | 45 | 7.5% |
| Q2 2024 | 151 | $677.7M | 26,853,009 | 44 | 43 | 35 | 7.3% |
| Q1 2024 | 123 | $343.4M | 23,663,668 | 38 | 40 | 18 | 6.9% |
| Q4 2023 | 98 | $200.7M | 15,940,040 | 30 | 23 | 23 | 11.5% |
| Q3 2023 | 73 | $114.0M | 12,979,568 | 17 | 26 | 15 | 14.0% |
| Q2 2023 | 69 | $80.4M | 11,928,370 | 15 | 21 | 13 | 7.1% |
| Q1 2023 | 63 | $59.3M | 11,760,435 | 10 | 17 | 17 | 2.6% |
| Q4 2022 | 62 | $41.0M | 10,887,602 | 14 | 12 | 22 | 2.2% |
| Q3 2022 | 77 | $61.3M | 13,932,577 | 8 | 27 | 21 | 0.4% |
| Q2 2022 | 85 | $70.2M | 13,251,985 | 18 | 21 | 27 | 2.2% |
| Q1 2022 | 102 | $123.1M | 15,680,314 | 16 | 35 | 24 | 2.9% |
| Q4 2021 | 104 | $182.6M | 16,417,241 | 17 | 33 | 26 | 2.2% |
| Q3 2021 | 100 | $255.5M | 16,719,164 | 16 | 36 | 25 | 4.8% |
| Q2 2021 | 101 | $304.9M | 16,418,240 | 19 | 29 | 34 | 6.2% |
| Q1 2021 | 106 | $328.8M | 16,363,569 | 19 | 35 | 27 | 5.0% |
| Q4 2020 | 107 | $450.3M | 17,625,193 | 29 | 42 | 21 | 3.7% |
| Q3 2020 | 87 | $215.0M | 14,000,861 | 20 | 25 | 26 | 5.4% |
| Q2 2020 | 75 | $98.7M | 11,713,747 | 12 | 30 | 18 | 3.7% |
| Q1 2020 | 69 | $61.1M | 10,975,531 | 6 | 28 | 19 | 1.8% |
| Q4 2019 | 71 | $87.5M | 10,945,367 | 10 | 33 | 19 | 2.2% |
| Q3 2019 | 74 | $81.9M | 10,234,473 | 11 | 23 | 16 | 2.0% |
| Q2 2019 | 74 | $96.3M | 10,022,775 | 24 | 18 | 19 | 3.5% |
| Q1 2019 | 75 | $126.6M | 9,547,812 | 21 | 20 | 21 | 2.9% |
| Q4 2018 | 67 | $76.1M | 6,569,627 | 4 | 1 | 0 | 4.1% |