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 | $107.94M 3,750,403 shares | 0.00% | +121.11K(+3.30%)Added | SEC filing ↗ Feb 12, 2026 | ▾ |
| 02 | VANGUARD GROUP INC CIK 102909 · View history | $101.50M 3,526,632 shares | 0.00% | +576.83K(+19.60%)Added | SEC filing ↗ Jan 29, 2026 | ▾ |
| 03 | BAILLIE GIFFORD & CO CIK 1088875 · View history | $43.37M 1,506,841 shares | 0.04% | +79.51K(+5.60%)Added | SEC filing ↗ Jan 23, 2026 | ▾ |
| 04 | STATE STREET CORP CIK 93751 · View history | $34.31M 1,192,093 shares | 0.00% | +56.22K(+4.90%)Added | SEC filing ↗ Feb 13, 2026 | ▾ |
| 05 | GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history | $31.40M 1,090,710 shares | 0.00% | +20.86K(+1.90%)Added | SEC filing ↗ Feb 9, 2026 | ▾ |
| 06 | Atreides Management, LP CIK 1777813 · View history | $30.05M 1,044,193 shares | 0.64% | +272.70K(+35.30%)Added | SEC filing ↗ Feb 17, 2026 | ▾ |
| 07 | Nuveen, LLC CIK 1871926 · View history | $27.66M 960,968 shares | 0.01% | +134.82K(+16.30%)Added | SEC filing ↗ Feb 12, 2026 | ▾ |
| 08 | OBERWEIS ASSET MANAGEMENT INC/ CIK 937886 · View history | $24.06M 835,900 shares | 0.88% | +170.20K(+25.60%)Added | SEC filing ↗ Feb 17, 2026 | ▾ |
| 09 | GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history | $22.51M 782,287 shares | 0.00% | -391.82K(-33.40%)Reduced | SEC filing ↗ Mar 25, 2026 | ▾ |
| 10 | EMERALD ADVISERS, LLC CIK 1015083 · View history | $21.80M 757,568 shares | 0.67% | +236.38K(+45.40%)Added | SEC filing ↗ Feb 9, 2026 | ▾ |
| 11 | AWM Investment Company, Inc. CIK 1535264 · View history | $21.71M 754,220 shares | 2.10% | +8.75K(+1.20%)Added | SEC filing ↗ Feb 13, 2026 | ▾ |
| 12 | UBS Group AG CIK 1610520 · View history | $21.43M 744,563 shares | 0.00% | +550.83K(+284.30%)Added | SEC filing ↗ Jan 29, 2026 | ▾ |
| 13 | MORGAN STANLEY CIK 895421 · Amended · View history | $20.30M 705,442 shares | 0.00% | +369.68K(+110.10%)Added | SEC filing ↗ May 27, 2026 | ▾ |
| 14 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history | $19.66M 683,202 shares | 0.01% | -77.25K(-10.20%)Reduced | SEC filing ↗ Feb 13, 2026 | ▾ |
| 15 | FIRST TRUST ADVISORS LP CIK 1125816 · View history | $19.66M 682,967 shares | 0.01% | +224.58K(+49.00%)Added | SEC filing ↗ Feb 13, 2026 | ▾ |
| 16 | Telemark Asset Management, LLC CIK 1420816 · View history | $17.84M 619,900 shares | 1.78% | -70.10K(-10.20%)Reduced | SEC filing ↗ Feb 11, 2026 | ▾ |
| 17 | Qube Research & Technologies Ltd CIK 1729829 · View history | $17.24M 599,006 shares | 0.02% | +341.41K(+132.50%)Added | SEC filing ↗ Feb 17, 2026 | ▾ |
| 18 | DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history | $15.55M 540,253 shares | 0.00% | +68.77K(+14.60%)Added | SEC filing ↗ Feb 12, 2026 | ▾ |
| 19 | Driehaus Capital Management LLC CIK 938206 · View history | $14.39M 499,984 shares | 0.10% | -718.96K(-59.00%)Reduced | SEC filing ↗ Feb 17, 2026 | ▾ |
| 20 | ALGERT GLOBAL LLC CIK 1275218 · Amended · View history | $13.26M 460,771 shares | 0.21% | +172.89K(+60.10%)Added | SEC filing ↗ Aug 11, 2026 | ▾ |
Showing 20 / 240 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.
Explore all 240 reporting institutions.
This page includes 20 of 240 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.
- Download CSV
- Earlier quarters
- Advanced screening & filtering
- API & AI access
＋ New accounts get free API credits to explore data beyond ownership filings.
For AI agents & developers
The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 240 reporting institutions; totals use the complete disclosed data.
Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.
MCP https://api.akkrudata.ai/mcp
akkru_institutional_holdings
{"action":"holders","cusip":"030111207","quarter":"2025Q4","type":"positions","page_size":100}Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.
- MCP endpoint
- https://api.akkrudata.ai/mcp
- API / MCP / CLI documentation
- /documents
- llms.txt
- /llms.txt
Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.