AMERICAN SUPERCONDUCTOR CORP /DE/ AMSC
CIK 0000880807 · CUSIP 030111207
Quarter-end disclosures, not live holdings.
Top 20 institutions
Weight means this stock's share of the manager's own portfolio.
| # | Manager | Value | Manager weight | Change vs prior | Source | |
|---|---|---|---|---|---|---|
| 01 | BlackRock, Inc. CIK 2012383 · View history | $215.54M 3,629,296 shares | 0.00% | +209.26K(+6.10%)Added | SEC filing ↗ Nov 12, 2025 | ▾ |
| 02 | VANGUARD GROUP INC CIK 102909 · View history | $175.19M 2,949,801 shares | 0.00% | +502.75K(+20.50%)Added | SEC filing ↗ Nov 7, 2025 | ▾ |
| 03 | BAILLIE GIFFORD & CO CIK 1088875 · View history | $84.77M 1,427,332 shares | 0.06% | -25.35K(-1.70%)Reduced | SEC filing ↗ Oct 31, 2025 | ▾ |
| 04 | Driehaus Capital Management LLC CIK 938206 · View history | $72.39M 1,218,944 shares | 0.52% | +379.10K(+45.10%)Added | SEC filing ↗ Nov 14, 2025 | ▾ |
| 05 | GOLDMAN SACHS GROUP INC CIK 886982 · View history | $69.73M 1,174,107 shares | 0.01% | +145.06K(+14.10%)Added | SEC filing ↗ Nov 14, 2025 | ▾ |
| 06 | STATE STREET CORP CIK 93751 · View history | $67.46M 1,135,878 shares | 0.00% | +115.71K(+11.30%)Added | SEC filing ↗ Nov 14, 2025 | ▾ |
| 07 | GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history | $63.55M 1,069,855 shares | 0.00% | +129.74K(+13.80%)Added | SEC filing ↗ Nov 12, 2025 | ▾ |
| 08 | Nuveen, LLC CIK 1871926 · View history | $49.07M 826,152 shares | 0.01% | -171.75K(-17.20%)Reduced | SEC filing ↗ Nov 12, 2025 | ▾ |
| 09 | FULLER & THALER ASSET MANAGEMENT, INC. CIK 1082327 · View history | $48.10M 809,945 shares | 0.16% | +809.95KNew | SEC filing ↗ Nov 13, 2025 | ▾ |
| 10 | Atreides Management, LP CIK 1777813 · View history | $45.82M 771,495 shares | 1.19% | -332.96K(-30.10%)Reduced | SEC filing ↗ Nov 14, 2025 | ▾ |
| 11 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history | $45.16M 760,457 shares | 0.03% | +524.06K(+221.70%)Added | SEC filing ↗ Nov 13, 2025 | ▾ |
| 12 | D. E. Shaw & Co., Inc. CIK 1009207 · View history | $44.70M 752,703 shares | 0.04% | +619.06K(+463.20%)Added | SEC filing ↗ Nov 14, 2025 | ▾ |
| 13 | AWM Investment Company, Inc. CIK 1535264 · View history | $44.27M 745,470 shares | 4.15% | -813.01K(-52.20%)Reduced | SEC filing ↗ Nov 13, 2025 | ▾ |
| 14 | Telemark Asset Management, LLC CIK 1420816 · View history | $40.98M 690,000 shares | 3.89% | 0(0.00%)Unchanged | SEC filing ↗ Nov 10, 2025 | ▾ |
| 15 | OBERWEIS ASSET MANAGEMENT INC/ CIK 937886 · View history | $39.54M 665,700 shares | 1.51% | -2.50K(-0.40%)Reduced | SEC filing ↗ Nov 17, 2025 | ▾ |
| 16 | EMERALD ADVISERS, LLC CIK 1015083 · View history | $30.95M 521,183 shares | 0.99% | +21.13K(+4.20%)Added | SEC filing ↗ Oct 30, 2025 | ▾ |
| 17 | DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history | $28.01M 471,484 shares | 0.01% | -9.27K(-1.90%)Reduced | SEC filing ↗ Nov 12, 2025 | ▾ |
| 18 | MACQUARIE GROUP LTD CIK 1418333 · View history | $27.63M 465,221 shares | 0.03% | -356.96K(-43.40%)Reduced | SEC filing ↗ Nov 13, 2025 | ▾ |
| 19 | FIRST TRUST ADVISORS LP CIK 1125816 · View history | $27.22M 458,391 shares | 0.02% | +120.82K(+35.80%)Added | SEC filing ↗ Nov 12, 2025 | ▾ |
| 20 | WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history | $23.71M 399,246 shares | 0.00% | -32.34K(-7.50%)Reduced | SEC filing ↗ Nov 14, 2025 | ▾ |
Showing 20 / 272 institutions. The complete set is available through the API.
Coverage & totals by quarter
Reporting institutions by quarter
Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.
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