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Buy Day today: Good (62) Broad market participation · no major macro event
AMSC

American Superconductor Corporation

Industrials · Specialty Industrial Machinery

29.20$ +4.8% vs. previous close Closing price · As of: Sep 17, 2026

Ownership

Ownership Structure

Who owns American Superconductor Corporation (AMSC)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 96.5% of the shares are freely tradable; institutional investors hold 69.8%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 69.8%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 3.4%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 96.5%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 7.8%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 48Mio.

Largest Shareholders

Institutions

Institutions AMSC
Name Stake (%) Shares Change (%) Date
BlackRock Inc 8.22 3,982,650 +6.2 03/31/2026
Vanguard Capital Management, LLC 4.21 2,039,468 +0.0 03/31/2026
Vanguard Portfolio Management, LLC 3.53 1,711,677 +0.0 03/31/2026
Barrow Hanley Mewhinney & Strauss LLC 3.52 1,704,006 +49.5 06/30/2026
State Street Corp 2.60 1,261,071 +5.8 03/31/2026
Geode Capital Management, LLC 2.41 1,169,152 +7.2 03/31/2026
First Trust Advisors L.P. 2.41 1,168,424 +50.1 06/30/2026
Nuveen, LLC 2.11 1,020,947 +6.2 03/31/2026

Funds

Funds AMSC
Name Stake (%) Shares Change (%) Date
Vanguard MStar Total Stk Mkt Idx Invest 2.98 1,442,291 +0.1 07/31/2026
iShares Russell 2000 ETF 2.49 1,204,352 -0.6 08/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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