Ticker · CUSIP 030111207

AMSC

AMERICAN SUPERCONDUCTOR CORP
Industrials·Specialty Industrial Machinery
···Share
Holders (tracked)
16
Combined shares
4,349,158
Combined value
$117.27M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+3 vs previous quarter over the last 8.
16102024Q12025Q4

SEC event timeline

21 events
  1. Ken Griffin (Citadel Advisors) added2026-02-17
    +322,892 shares · 2025Q4
    13F
  2. D.E. Shaw & Co. trimmed2026-02-17
    −309,555 shares · 2025Q4
    13F
  3. Two Sigma Investments added2026-02-17
    +199,948 shares · 2025Q4
    13F
  4. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −44,414 shares · 2025Q4
    13F
  5. Steve Cohen (Point72) added2026-02-17
    +44,234 shares · 2025Q4
    13F
  6. T. Rowe Price trimmed2026-02-17
    −121,488 shares · 2025Q4
    13F
  7. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +251,642 shares · 2025Q4
    13F
  8. Wellington Management exited2026-02-17
    −399,246 shares · 2025Q4
    13F
  9. AQR Capital Management trimmed2026-02-17
    −22,786 shares · 2025Q4
    13F
  10. Renaissance Technologies trimmed2026-02-12
    −184,000 shares · 2025Q4
    13F
  11. Baillie Gifford & Co added2026-01-23
    +79,509 shares · 2025Q4
    13F
  12. Paul Tudor Jones (Tudor Investment) exited2025-12-09
    −260,121 shares · 2025Q3
    13F
  13. Two Sigma Investments trimmed2025-11-14
    −1,227 shares · 2025Q3
    13F
  14. Izzy Englander (Millennium Mgmt) trimmed2025-11-14
    −129,305 shares · 2025Q3
    13F
  15. Wellington Management trimmed2025-11-14
    −32,343 shares · 2025Q3
    13F
  16. AQR Capital Management trimmed2025-11-14
    −139 shares · 2025Q3
    13F
  17. Steve Cohen (Point72) trimmed2025-11-14
    −12,436 shares · 2025Q3
    13F
  18. D.E. Shaw & Co. added2025-11-14
    +619,059 shares · 2025Q3
    13F
  19. T. Rowe Price added2025-11-14
    +368,479 shares · 2025Q3
    13F
  20. Renaissance Technologies opened position2025-11-13
    +323,989 shares · 2025Q3
    13F
  21. Baillie Gifford & Co trimmed2025-10-31
    −25,347 shares · 2025Q3
    13F

Insider activity

No insider transactions in the last 30 days.
View full insider history for AMSC →

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions1
Added to4
Trimmed5
Exited1

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
7
$32.2M
2022Q2
10
$17.8M
2022Q3
8
$13K
2022Q4
9
$9.3M
2023Q1
9
$11.8M
2023Q2
11
$17.3M
2023Q3
9
$26.8M
2023Q4
8
$40.2M
2024Q1
10
$58.9M
2024Q2
13
$159.0M
2024Q3
11
$85.5M
2024Q4
11
$80.1M
2025Q1
14
$59.7M
2025Q2
15
$147.8M
2025Q3
13
$227.8M
2025Q4
16
$117.3M

Who owns AMSC

16 super-investors · 2025Q4
Tracked stake
4.35M
shares
Combined value
$117M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New3Added7Trim6
#ManagerSharesValue
1Baillie Gifford & Co1.51M$43M
2D.E. Shaw & Co.443.1K$13M
3Ken Griffin
Citadel Advisors
337.7K$10M
4Two Sigma Investments321.6K$9M
5Ken Griffin
Citadel Advisors
320.6K$9M
6Ken Griffin
Citadel Advisors
282.4K$8M
7Paul Tudor Jones
Tudor Investment
251.6K$7M
8AQR Capital Management146.0K$4M
9Renaissance Technologies140.0K$4M
10D.E. Shaw & Co.95.8K$3M
11Izzy Englander
Millennium Mgmt
78.1K$2M
12Steve Cohen
Point72
77.5K$2M
13Steve Cohen
Point72
33.1K$953K
14Paul Tudor Jones
Tudor Investment
32.0K$921K
15Paul Tudor Jones
Tudor Investment
8.0K$230K
16T. Rowe Price274.8K$8K

Recent moves

20 transactions
Embed this chart
Paste this iframe anywhere to embed the live AMSC chart.
<iframe src="https://openstocks.me/embed/stock/AMSC" width="100%" height="480" frameborder="0" loading="lazy" title="AMSC chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>
Preview: https://openstocks.me/embed/stock/AMSC