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 | $125.48M 3,420,039 shares | 0.00% | +161.62K(+5.00%)Added | SEC filing ↗ Aug 12, 2025 | ▾ |
| 02 | VANGUARD GROUP INC CIK 102909 · View history | $89.78M 2,447,047 shares | 0.00% | +159.46K(+7.00%)Added | SEC filing ↗ Aug 11, 2025 | ▾ |
| 03 | AWM Investment Company, Inc. CIK 1535264 · View history | $57.18M 1,558,478 shares | 6.45% | 0(0.00%)Unchanged | SEC filing ↗ Aug 14, 2025 | ▾ |
| 04 | BAILLIE GIFFORD & CO CIK 1088875 · View history | $53.30M 1,452,679 shares | 0.04% | -66.21K(-4.40%)Reduced | SEC filing ↗ Aug 6, 2025 | ▾ |
| 05 | Hood River Capital Management LLC CIK 1578177 · View history | $42.89M 1,168,906 shares | 0.60% | -70.19K(-5.70%)Reduced | SEC filing ↗ Aug 14, 2025 | ▾ |
| 06 | Atreides Management, LP CIK 1777813 · View history | $40.52M 1,104,458 shares | 1.12% | +280.42K(+34.00%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
| 07 | GOLDMAN SACHS GROUP INC CIK 886982 · View history | $37.76M 1,029,047 shares | 0.01% | +547.09K(+113.50%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
| 08 | STATE STREET CORP CIK 93751 · View history | $37.43M 1,020,165 shares | 0.00% | +130.12K(+14.60%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
| 09 | Nuveen, LLC CIK 1871926 · View history | $36.61M 997,902 shares | 0.01% | +219.34K(+28.20%)Added | SEC filing ↗ Aug 12, 2025 | ▾ |
| 10 | GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history | $34.50M 940,111 shares | 0.00% | +58.43K(+6.60%)Added | SEC filing ↗ Aug 8, 2025 | ▾ |
| 11 | Driehaus Capital Management LLC CIK 938206 · View history | $30.81M 839,847 shares | 0.25% | +4(0.00%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
| 12 | MACQUARIE GROUP LTD CIK 1418333 · View history | $30.17M 822,179 shares | 0.04% | -204.64K(-19.90%)Reduced | SEC filing ↗ Aug 14, 2025 | ▾ |
| 13 | ROYCE & ASSOCIATES LP CIK 906304 · View history | $29.78M 811,732 shares | 0.31% | -55.61K(-6.40%)Reduced | SEC filing ↗ Aug 11, 2025 | ▾ |
| 14 | Telemark Asset Management, LLC CIK 1420816 · View history | $25.32M 690,000 shares | 2.69% | +90.00K(+15.00%)Added | SEC filing ↗ Aug 12, 2025 | ▾ |
| 15 | CITADEL ADVISORS LLC CIK 1423053 · View history | $25.30M 689,691 shares | 0.02% | +558.13K(+424.20%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
| 16 | OBERWEIS ASSET MANAGEMENT INC/ CIK 937886 · View history | $24.52M 668,200 shares | 1.07% | 0(0.00%)Unchanged | SEC filing ↗ Aug 14, 2025 | ▾ |
| 17 | MORGAN STANLEY CIK 895421 · View history | $20.93M 570,356 shares | 0.00% | +60.46K(+11.90%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
| 18 | EMERALD ADVISERS, LLC CIK 1015083 · View history | $18.35M 500,054 shares | 0.67% | +461.33K(+1,191.50%)Added | SEC filing ↗ Aug 4, 2025 | ▾ |
| 19 | DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history | $17.64M 480,753 shares | 0.00% | -187.40K(-28.00%)Reduced | SEC filing ↗ Aug 12, 2025 | ▾ |
| 20 | WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history | $15.84M 431,589 shares | 0.00% | +142.42K(+49.20%)Added | SEC filing ↗ Aug 14, 2025 | ▾ |
Showing 20 / 233 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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