American Superconductor Corp /DE/

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American Superconductor Corp /DE/
TickerAMSC
CIK #0000880807
CUSIP030111207
SectorManufacturing - Motors & Generators
AddressSixty Four Jackson Road, Devens, MA 01434
Source [EDGAR]
CIK Filing 2011 - 2025
[0000880807] 10-K
[0000880807] 10-Q
[0000880807] 3
[0000880807] 4
[0000880807] 8-K
[0000880807] D
[0000880807] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
BlackRock Inc American Superconductor Corp /DE/ [2024-11-08] 7.1
Vanguard Group Inc American Superconductor Corp /DE/ [2024-11-04] 6.33
BlackRock Inc American Superconductor Corp /DE/ [2024-10-22] 7.1
AWM Investment Company Inc American Superconductor Corp /DE/ [2023-02-14] 8.7
Royce & Associates LP American Superconductor Corp /DE/ [2023-01-31] 5.69
BlackRock Inc American Superconductor Corp /DE/ [2022-07-08] 1.8
Footprints Asset Management & Research American Superconductor Corp /DE/ [2022-02-14] 1.82
Baillie Gifford & Co American Superconductor Corp /DE/ [2022-01-18] 5.25
Invesco Ltd American Superconductor Corp /DE/ [2021-02-16] 6.9
Renaissance Technologies LLC American Superconductor Corp /DE/ [2020-02-12] 5.67
BlackRock Inc American Superconductor Corp /DE/ [2020-02-07] 6.5
Douglas Kevin American Superconductor Corp /DE/ [2020-01-27] 0.4
Integrated Core Strategies US LLC American Superconductor Corp /DE/ [2019-06-24] 0.3
Footprints Asset Management & Research American Superconductor Corp /DE/ [2019-02-14] 5.8
Hirschman Orin American Superconductor Corp /DE/ [2019-02-08] 9.9
Hirschman Orin American Superconductor Corp /DE/ [2018-10-05] 4.95
Satterfield Thomas A Jr American Superconductor Corp /DE/ [2018-03-08] 5.0
AWM Investment Company Inc American Superconductor Corp /DE/ [2018-02-13] 5.5
Ardsley Advisory Partners American Superconductor Corp /DE/ [2017-05-08] 7.4
Footprints Asset Management & Research American Superconductor Corp /DE/ [2016-02-12] 5.7
AWM Investment Company Inc American Superconductor Corp /DE/ [2016-02-11] 9.8
BlackRock Inc American Superconductor Corp /DE/ [2014-01-28] 5.5
Capital Ventures International /E9/ American Superconductor Corp /DE/ [2012-12-31] 0.9
Form 3/4/5 Filer 2011 - 2025
House Arthur H
American Superconductor Corp /DE/
Klein Margaret D.
McGahn Daniel P
Kosiba John W JR
Donnelly Terence Robert
Oliver David R Jr
Dambier Laura A.
Littlefield Barbara G.
Budhraja Vikram S
Wood John W Jr
Lenehan Pamela F
Sande John Vander
Maguire James F
Henry David A
Douglas Family Trust
Douglas Michelle
Douglas Kevin
Douglas James E III
James & Jean Douglas Irrevocable Descendants Trust
Drouin Richard
DiCecco Susan J
Poor Timothy D.
Form 13F Holdings
Firm Period DFND Voting Shares
BlackRock, Inc. [2025-06-30] SOLE 3,322,574 3,420,039
Vanguard Group Inc [2025-06-30] SOLE 0 2,354,187
AWM Investment Company Inc [2025-06-30] SOLE 1,558,478 1,558,478
Hood River Capital Management LLC [2025-06-30] SOLE 1,127,071 1,168,906
Citadel Advisors LLC [2025-06-30] DFND 1,120,891 1,120,891
Atreides Management LP [2025-06-30] SOLE 1,104,458 1,104,458
Goldman Sachs Group Inc [2025-06-30] DFND 987,902 1,029,047
State Street Corp [2025-06-30] DFND 958,375 1,020,165
Nuveen, LLC [2025-06-30] DFND 987,922 997,902
Geode Capital Management LLC [2025-06-30] DFND 940,111 940,111
Baillie Gifford & Co [2025-06-30] DFND 845,276 845,276
Driehaus Capital Management LLC [2025-06-30] SOLE 650,276 839,847
Macquarie Group Ltd [2025-06-30] SOLE 822,179 822,179
Royce & Associates LP [2025-06-30] SOLE 811,732 811,732
Susquehanna International Group LLP [2025-06-30] OTR 95,265 770,765
Telemark Asset Management LLC [2025-06-30] SOLE 690,000 690,000
Heights Capital Management Inc [2025-06-30] OTR 340,102 683,002
Oberweis Asset Management Inc [2025-06-30] SOLE 668,200 668,200
Baillie Gifford & Co [2025-06-30] SOLE 607,403 607,403
Jane Street Group LLC [2025-06-30] DFND 518,305 586,705
Morgan Stanley [2025-06-30] DFND 369,429 570,356
Peak6 LLC [2025-06-30] DFND 525,200 525,200
Emerald Advisers LLC [2025-06-30] SOLE 372,409 500,054
Dimensional Fund Advisors LP [2025-06-30] SOLE 413,625 433,951
Wellington Management Group LLP [2025-06-30] DFND 0 431,589
Legal & General Group Plc [2025-06-30] DFND 407,023 417,039
Essex Investment Management Co LLC [2025-06-30] SOLE 268,275 346,042
First Trust Advisors LP [2025-06-30] SOLE 337,574 337,574
Northern Trust Corp [2025-06-30] DFND 335,654 335,654
Charles Schwab Investment Management Inc [2025-06-30] SOLE 322,958 322,958
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