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AMSC · American Superconductor Corp /De/ · Holdings

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$31.74 -0.11 (-0.35%) At close · Oct 7
Market Cap
$1.42B
Shares
48.44M
Volume · Oct 7 1.37M Avg daily vol (3M) 718.42K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 279
Total Value: $1,536,242,851
Total Shares: 37,014,761
Showing 1–100 of 290 holdings by value · page 1 of 3

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 279 13F filers
Top Holder
11.1%
Sep 2023 → Jun 2026 · range 8.8% – 12.8%
of institutional value
Top 5
28.9%
Sep 2023 → Jun 2026 · range 28.4% – 46.5%
of institutional value
Top 10
45.2%
Sep 2023 → Jun 2026 · range 43.4% – 67.4%
of institutional value
HHI
324
Sep 2023 → Jun 2026 · range 300 – 593
Broadly held
Showing 100 of 290
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 880807 CUSIP 030111207 13F (30d) 10 filings 8 filers Visit website Investor relations