Skip to main content
AMSC logo

AMSC · American Superconductor Corp /De/

Track AMSC — free
$30.01 -0.04 (-0.13%) At close · Aug 21
Market Cap
$1.45B
Shares
48.44M

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.

Holders: 278
Total Value: $1,534,224,661
Total Shares: 36,960,367

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 278 13F filers · Δ vs Mar 31, 2026
Top Holder
11.1%
Sep 2023 → Jun 2026 · range 8.8% – 12.8%
−0.5 pts
Top 5
28.9%
Sep 2023 → Jun 2026 · range 28.4% – 46.5%
−1.6 pts
Top 10
45.3%
Sep 2023 → Jun 2026 · range 43.4% – 67.4%
+0.3 pts
HHI
324
Sep 2023 → Jun 2026 · range 300 – 593
Broadly held−7

Quarterly Activity

vs Mar 31, 2026
New
67
Increased
108
Decreased
77
Sold Out
35
Unchanged
26
Holder count: +32
Institutional value: +32.2%
Shares held: +7.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 289
Export CSV
Holder Value (USD) % of 13F Shares Open
Key facts CIK 880807 CUSIP 030111207 13F (30d) 253 filings 247 filers Visit website Investor relations