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American Superconductor Corp /DE/(AMSC US)

$24.13-0.913.63%Ext:$23.85-0.281.15%(Market Closed · 01:00:00 UTC)
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Overview

ProfileEntity Structure

Documents

SEC Filings
CategorizedChronologicalBy Owner

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FinancialsChartingShort InterestEmployees
Logo
  • Home
  • AI Agent
  • Annotations
  • Files
  • Pricing and plans
  • BlogAboutContact us
    APIMCP
    Terms of servicePrivacy policy

  • Get the full experience

    We save the real magic for signed-in users.

HomeStock ScreenerDocument SearchChartingWatchlistsRecent Filings

American Superconductor Corp /DE/(AMSC US)

$24.13-0.913.63%Ext:$23.85-0.281.15%(Market Closed · 01:00:00 UTC)
Doc SearchProfileEntity StructureFinancialsChartingShort InterestEmployees

Overview

ProfileEntity Structure

Documents

SEC Filings
CategorizedChronologicalBy Owner

Financials & Metrics

FinancialsChartingShort InterestEmployees
AMSC US​
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SEC Filings by Owner

SEC Filings by Owner

Insider Ownership

McGahn Daniel P(68)

  • Form 4Statement of changes in beneficial ownership11 Jun
  • Form 4Statement of changes in beneficial ownership10 Jun
  • Form 4Statement of changes in beneficial ownership3 Jun
  • Form 4Statement of changes in beneficial ownership6 Aug 2025
  • Form 4Statement of changes in beneficial ownership12 Jun 2025
  • Form 4Statement of changes in beneficial ownership9 Jun 2025
  • Form 4Statement of changes in beneficial ownership29 May 2025
  • Form 4Statement of changes in beneficial ownership22 May 2025
  • Form 4Statement of changes in beneficial ownership19 May 2025
  • Form 4Statement of changes in beneficial ownership1 Oct 2024

YUREK GREGORY J(62)

  • Form 4Statement of changes in beneficial ownership2 Jun 2011
  • Form 5Annual statement of beneficial ownership2 Jun 2011
  • Form 4Statement of changes in beneficial ownership13 Oct 2010
  • Form 4Statement of changes in beneficial ownership8 Oct 2010
  • Form 4Statement of changes in beneficial ownership16 Sep 2010
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 5Annual statement of beneficial ownership9 Apr 2010
  • Form 4Statement of changes in beneficial ownership8 Feb 2010
  • Form 4Statement of changes in beneficial ownership7 Jan 2010
  • Form 4Statement of changes in beneficial ownership4 Jan 2010

Kosiba John W JR(52)

  • Form 4Statement of changes in beneficial ownership11 Jun
  • Form 4Statement of changes in beneficial ownership10 Jun
  • Form 4Statement of changes in beneficial ownership3 Jun
  • Form 4Statement of changes in beneficial ownership6 Aug 2025
  • Form 4Statement of changes in beneficial ownership12 Jun 2025
  • Form 4Statement of changes in beneficial ownership9 Jun 2025
  • Form 4Statement of changes in beneficial ownership29 May 2025
  • Form 4Statement of changes in beneficial ownership22 May 2025
  • Form 4Statement of changes in beneficial ownership19 May 2025
  • Form 4Statement of changes in beneficial ownership6 Nov 2024

MALOZEMOFF ALEXIS P(35)

  • Form 4Statement of changes in beneficial ownership19 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership5 May 2009
  • Form 4Statement of changes in beneficial ownership28 Apr 2009
  • Form 4Statement of changes in beneficial ownership19 Feb 2009
  • Form 4Statement of changes in beneficial ownership3 Oct 2008
  • Form 4Statement of changes in beneficial ownership5 Sep 2008

DOUGLAS KEVIN(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

HENRY DAVID A(29)

  • Form 4Statement of changes in beneficial ownership22 Aug 2016
  • Form 4Statement of changes in beneficial ownership20 Jun 2016
  • Form 4Statement of changes in beneficial ownership17 May 2016
  • Form 4Statement of changes in beneficial ownership10 May 2016
  • Form 4Statement of changes in beneficial ownership7 Apr 2016
  • Form 4Statement of changes in beneficial ownership4 Aug 2015
  • Form 4Statement of changes in beneficial ownership15 May 2015
  • Form 4Statement of changes in beneficial ownership12 May 2015
  • Form 4Statement of changes in beneficial ownership4 Aug 2014
  • Form 4Statement of changes in beneficial ownership26 Jun 2014

DOUGLAS FAMILY TRUST(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

JAMES & JEAN DOUGLAS IRREVOCABLE DESCENDANTS TRUST(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

DOUGLAS JAMES E III(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

BUDHRAJA VIKRAM S(26)

  • Form 4Statement of changes in beneficial ownership13 Jun 2022
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership9 Dec 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership4 Apr 2019
  • Form 4Statement of changes in beneficial ownership6 Apr 2018
  • Form 4Statement of changes in beneficial ownership12 May 2017
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership5 Apr 2016

OLIVER DAVID R JR(24)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership26 Feb
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership13 Nov 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2019

STANKIEWICZ CHARLES W(22)

  • Form 4Statement of changes in beneficial ownership25 Aug 2011
  • Form 4Statement of changes in beneficial ownership16 May 2011
  • Form 5Annual statement of beneficial ownership8 Apr 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 5Annual statement of beneficial ownership9 Apr 2010
  • Form 4Statement of changes in beneficial ownership31 Jul 2009
  • Form 4Statement of changes in beneficial ownership12 Jun 2009
  • Form 4Statement of changes in beneficial ownership9 Jun 2009
  • Form 4Statement of changes in beneficial ownership14 May 2009
  • Form 4Statement of changes in beneficial ownership30 May 2008

SANDE JOHN VANDER(21)

  • Form 4Statement of changes in beneficial ownership8 Aug 2017
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership29 Nov 2016
  • Form 4Statement of changes in beneficial ownership5 Apr 2016
  • Form 4Statement of changes in beneficial ownership6 Feb 2015
  • Form 4Statement of changes in beneficial ownership8 Apr 2015
  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership10 Dec 2013
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012

Douglas Michelle(18)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

WOOD JOHN W JR(17)

  • Form 4Statement of changes in beneficial ownership24 May 2019
  • Form 4Statement of changes in beneficial ownership4 Apr 2019
  • Form 4Statement of changes in beneficial ownership6 Apr 2018
  • Form 4Statement of changes in beneficial ownership12 May 2017
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership5 Apr 2016
  • Form 4Statement of changes in beneficial ownership8 Apr 2015
  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012

SANTAMARIA ANGELO R(16)

  • Form 4Statement of changes in beneficial ownership12 Aug 2011
  • Form 4Statement of changes in beneficial ownership17 May 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 4Statement of changes in beneficial ownership8 Feb 2010
  • Form 4Statement of changes in beneficial ownership4 Jun 2009
  • Form 4Statement of changes in beneficial ownership14 May 2009
  • Form 4Statement of changes in beneficial ownership7 May 2009
  • Form 4Statement of changes in beneficial ownership3 Jul 2008
  • Form 4Statement of changes in beneficial ownership30 May 2008
  • Form 4Statement of changes in beneficial ownership21 May 2008

DROUIN RICHARD(15)

  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012
  • Form 4Statement of changes in beneficial ownership15 Dec 2011
  • Form 4Statement of changes in beneficial ownership13 Aug 2010
  • Form 4Statement of changes in beneficial ownership12 Aug 2009
  • Form 4Statement of changes in beneficial ownership14 Aug 2008
  • Form 4Statement of changes in beneficial ownership4 Jun 2008
  • Form 4Statement of changes in beneficial ownership4 Jun 2008
  • Form 4Statement of changes in beneficial ownership3 Jun 2008

Maguire James F(15)

  • Form 4Statement of changes in beneficial ownership22 Aug 2016
  • Form 4Statement of changes in beneficial ownership20 May 2016
  • Form 4Statement of changes in beneficial ownership17 May 2016
  • Form 4Statement of changes in beneficial ownership10 May 2016
  • Form 4Statement of changes in beneficial ownership4 Aug 2015
  • Form 4Statement of changes in beneficial ownership15 May 2015
  • Form 4Statement of changes in beneficial ownership12 May 2015
  • Form 4Statement of changes in beneficial ownership29 Aug 2014
  • Form 4Statement of changes in beneficial ownership4 Aug 2014
  • Form 4Statement of changes in beneficial ownership2 Aug 2013

House Arthur H(13)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership8 Aug 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership4 Apr 2019
  • Form 4Statement of changes in beneficial ownership6 Apr 2018

DiCecco Susan J(12)

  • Form 4Statement of changes in beneficial ownership3 Jan 2013
  • Form 4Statement of changes in beneficial ownership26 Oct 2012
  • Form 4Statement of changes in beneficial ownership28 Jun 2012
  • Form 4Statement of changes in beneficial ownership15 May 2012
  • Form 4Statement of changes in beneficial ownership10 May 2012
  • Form 4Statement of changes in beneficial ownership28 Sep 2011
  • Form 4Statement of changes in beneficial ownership16 May 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 4Statement of changes in beneficial ownership18 Dec 2009
  • Form 4Statement of changes in beneficial ownership6 Nov 2009

BACIOCCO ALBERT J JR(10)

  • Form 4Statement of changes in beneficial ownership21 May 2007
  • Form 4Statement of changes in beneficial ownership21 May 2007
  • Form 4Statement of changes in beneficial ownership23 Mar 2007
  • Form 4Statement of changes in beneficial ownership16 Mar 2007
  • Form 4Statement of changes in beneficial ownership2 Aug 2006
  • Form 4Statement of changes in beneficial ownership3 Aug 2005
  • Form 4Statement of changes in beneficial ownership3 Aug 2004
  • Form 4Statement of changes in beneficial ownership25 Feb 2004
  • Form 4Statement of changes in beneficial ownership20 Feb 2004
  • Form 4Statement of changes in beneficial ownership8 Oct 2003

CRISP PETER O(10)

  • Form 4Statement of changes in beneficial ownership15 Dec 2011
  • Form 4Statement of changes in beneficial ownership13 Aug 2010
  • Form 4Statement of changes in beneficial ownership12 Aug 2009
  • Form 4Statement of changes in beneficial ownership14 Aug 2008
  • Form 4Statement of changes in beneficial ownership30 Jul 2008
  • Form 4Statement of changes in beneficial ownership10 Aug 2007
  • Form 4Statement of changes in beneficial ownership2 Aug 2006
  • Form 4Statement of changes in beneficial ownership3 Aug 2005
  • Form 4Statement of changes in beneficial ownership3 Aug 2004
  • Form 4Statement of changes in beneficial ownership8 Oct 2003

LENEHAN PAMELA F(10)

  • Form 4Statement of changes in beneficial ownership30 Jul 2018
  • Form 4Statement of changes in beneficial ownership6 Apr 2018
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership5 Apr 2016
  • Form 4Statement of changes in beneficial ownership8 Apr 2015
  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012
  • Form 4Statement of changes in beneficial ownership15 Mar 2011
  • Form 3Initial statement of beneficial ownership15 Mar 2011

Poor Timothy D.(10)

  • Form 4Statement of changes in beneficial ownership3 Jan 2013
  • Form 4Statement of changes in beneficial ownership26 Oct 2012
  • Form 4Statement of changes in beneficial ownership10 May 2012
  • Form 4Statement of changes in beneficial ownership28 Sep 2011
  • Form 4Statement of changes in beneficial ownership16 May 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 4Statement of changes in beneficial ownership16 Dec 2009
  • Form 4Statement of changes in beneficial ownership14 May 2009
  • Form 4Statement of changes in beneficial ownership16 May 2008
  • Form 3Initial statement of beneficial ownership15 May 2008

Littlefield Barbara G.(10)

  • Form 4Statement of changes in beneficial ownership21 Sep
  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership29 May 2019
  • Form 3Initial statement of beneficial ownership29 May 2019

Dambier Laura A.(7)

  • Form 4Statement of changes in beneficial ownership12 Jun
  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 3Initial statement of beneficial ownership13 Jun 2022
  • Form 4Statement of changes in beneficial ownership14 Jun 2022

Klein Margaret D.(7)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Aug 2025
  • Form 3Initial statement of beneficial ownership13 Jun 2022
  • Form 4Statement of changes in beneficial ownership14 Jun 2022

SAGE ANDREW G C II(5)

  • Form 4Statement of changes in beneficial ownership14 Mar 2007
  • Form 4Statement of changes in beneficial ownership2 Aug 2006
  • Form 4Statement of changes in beneficial ownership3 Aug 2005
  • Form 4Statement of changes in beneficial ownership3 Aug 2004
  • Form 4Statement of changes in beneficial ownership8 Oct 2003

ROSA THOMAS M(4)

  • Form 4Statement of changes in beneficial ownership16 Mar 2007
  • Form 4Statement of changes in beneficial ownership21 Mar 2006
  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership28 Apr 2004

PARATORE DAVID(3)

  • Form 4Statement of changes in beneficial ownership27 Jun 2005
  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership11 Mar 2004

KARON STUART(3)

  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership28 Apr 2004
  • Form 3Initial statement of beneficial ownership30 Jan 2004

Winter Terry M(3)

  • Form 4Statement of changes in beneficial ownership28 Jul 2006
  • Form 3Initial statement of beneficial ownership29 Jul 2005
  • Form 4Statement of changes in beneficial ownership29 Jul 2005

Donnelly Terence Robert(3)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership29 May 2025
  • Form 3Initial statement of beneficial ownership29 May 2025

GIBSON ROSS S(2)

  • Form 4Statement of changes in beneficial ownership9 Jun 2004
  • Form 4Statement of changes in beneficial ownership28 Apr 2004

BISSON KEVIN M(2)

  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership28 Apr 2004

Collett John R(2)

  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 3Initial statement of beneficial ownership13 May 2010

MENJON GERARD(1)

  • Form 4Statement of changes in beneficial ownership8 Oct 2003

≥5% Ownership

BlackRock Inc.(16)

  • SC 13GAmerican Superconductor Corp /De/8 Jul 2022
  • SC 13G/AAmerican Superconductor Corp /De/1 Feb 2022
  • SC 13G/AAmerican Superconductor Corp /De/29 Jan 2021
  • SC 13GAmerican Superconductor Corp /De/7 Feb 2020
  • SC 13G/AAmerican Superconductor Corp /De/10 Jul 2014
  • SC 13GAmerican Superconductor Corp /De/28 Jan 2014
  • SC 13G/AAmerican Superconductor Corp /De/10 Dec 2013
  • SC 13G/AAmerican Superconductor Corp /De/8 Feb 2013
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2012
  • SC 13G/AAmerican Superconductor Corp /De/8 Aug 2011

DOUGLAS KEVIN(15)

  • SC 13G/AAmerican Superconductor Corp /De/19 Jun 2020
  • SC 13GAmerican Superconductor Corp /De/27 Jan 2020
  • SC 13D/AAmerican Superconductor Corp /De/5 May 2015
  • SC 13D/AAmerican Superconductor Corp /De/14 Feb 2013
  • SC 13D/AAmerican Superconductor Corp /De/1 Feb 2012
  • SC 13D/AAmerican Superconductor Corp /De/7 Oct 2011
  • SC 13DAmerican Superconductor Corp /De/11 Apr 2011
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2011
  • SC 13G/AAmerican Superconductor Corp /De/8 Mar 2010
  • SC 13G/AAmerican Superconductor Corp /De/29 Jan 2010

AWM Investment Company, Inc.(10)

  • SC 13G/AAmerican Superconductor Corp /De/9 Aug 2024
  • SC 13G/AAmerican Superconductor Corp /De/14 Feb 2024
  • SC 13GAmerican Superconductor Corp /De/14 Feb 2023
  • SC 13G/AAmerican Superconductor Corp /De/8 Jan 2021
  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2020
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/13 Feb 2018
  • SC 13G/AAmerican Superconductor Corp /De/8 Sep 2017
  • SC 13G/AAmerican Superconductor Corp /De/10 Feb 2017
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2016

FMR LLC(9)

  • SC 13G/AAmerican Superconductor Corp /De/10 Jun 2011
  • SC 13G/AAmerican Superconductor Corp /De/14 Feb 2011
  • SC 13GAmerican Superconductor Corp /De/16 Feb 2010
  • SC 13G/AAmerican Superconductor Corp /De/17 Feb 2009
  • SC 13G/AAmerican Superconductor Corp /De/10 Nov 2008
  • SC 13G/AAmerican Superconductor Corp /De/14 Feb 2008
  • SC 13GAmerican Superconductor Corp /De/13 Nov 2007
  • SC 13G/AAmerican Superconductor Corp /De/9 Feb 1998
  • SC 13GAmerican Superconductor Corp /De/10 Feb 1997

STATE OF WISCONSIN INVESTMENT BOARD(7)

  • SC 13G/AAmerican Superconductor Corp /De/6 May 2003
  • SC 13G/AAmerican Superconductor Corp /De/9 Apr 2003
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2003
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2002
  • SC 13G/AAmerican Superconductor Corp /De/9 Feb 2001
  • SC 13G/AAmerican Superconductor Corp /De/25 Jan 2000
  • SC 13GAmerican Superconductor Corp /De/2 Feb 1999

Invesco Ltd.(6)

  • SC 13G/AAmerican Superconductor Corp /De/8 Feb 2023
  • SC 13G/AAmerican Superconductor Corp /De/9 Feb 2022
  • SC 13GAmerican Superconductor Corp /De/16 Feb 2021
  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2009
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2008
  • SC 13GAmerican Superconductor Corp /De/14 Feb 2007

BAILLIE GIFFORD & CO(6)

  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2025
  • SC 13G/AAmerican Superconductor Corp /De/4 Nov 2024
  • SC 13G/AAmerican Superconductor Corp /De/30 Jan 2024
  • SC 13G/AAmerican Superconductor Corp /De/5 Jul 2023
  • SC 13G/AAmerican Superconductor Corp /De/19 Jan 2023
  • SC 13GAmerican Superconductor Corp /De/18 Jan 2022

VANGUARD GROUP INC(4)

  • SC 13G/AAmerican Superconductor Corp /De/26 Mar
  • SC 13G/AAmerican Superconductor Corp /De/30 Jan
  • SC 13G/AAmerican Superconductor Corp /De/12 Nov 2024
  • SC 13GAmerican Superconductor Corp /De/4 Nov 2024

CAPITAL GROUP INTERNATIONAL INC(4)

  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2003
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2002
  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2001
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2000

CAPITAL VENTURES INTERNATIONAL(4)

  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2015
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2014
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2013
  • SC 13GAmerican Superconductor Corp /De/31 Dec 2012

BlackRock, Inc.(4)

  • SC 13G/AAmerican Superconductor Corp /De/17 Apr 2025
  • SC 13G/AAmerican Superconductor Corp /De/5 Feb 2025
  • SC 13GAmerican Superconductor Corp /De/8 Nov 2024
  • SC 13GAmerican Superconductor Corp /De/22 Oct 2024

MASSACHUSETTS FINANCIAL SERVICES CO /MA/(3)

  • SC 13GAmerican Superconductor Corp /De/4 Feb 2005
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2004
  • SC 13GAmerican Superconductor Corp /De/10 Nov 2003

SOROS FUND MANAGEMENT LLC(3)

  • SC 13G/AAmerican Superconductor Corp /De/1 Jul 1998
  • SC 13GAmerican Superconductor Corp /De/6 Mar 1998
  • SC 13DAmerican Superconductor Corp /De/8 Jan 1997

HIRSCHMAN ORIN(3)

  • SC 13G/AAmerican Superconductor Corp /De/8 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/8 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/5 Oct 2018

SATTERFIELD THOMAS A JR(3)

  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2020
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/8 Mar 2018

Footprints Asset Management & Research(3)

  • SC 13GAmerican Superconductor Corp /De/14 Feb 2022
  • SC 13GAmerican Superconductor Corp /De/14 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/12 Feb 2016

MERRILL LYNCH ASSET MANAGEMENT INC(2)

  • SC 13G/AAmerican Superconductor Corp /De/7 Feb 2006
  • SC 13GAmerican Superconductor Corp /De/8 Nov 2005

DIMENSIONAL FUND ADVISORS INC(2)

  • SC 13G/AAmerican Superconductor Corp /De/6 Feb 2004
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2003

ARDSLEY ADVISORY PARTNERS(2)

  • SC 13G/AAmerican Superconductor Corp /De/26 Jan 2018
  • SC 13GAmerican Superconductor Corp /De/8 May 2017

ROYCE & ASSOCIATES LP(2)

  • SC 13G/AAmerican Superconductor Corp /De/30 Jan 2024
  • SC 13GAmerican Superconductor Corp /De/31 Jan 2023

RENAISSANCE TECHNOLOGIES LLC(2)

  • SC 13G/AAmerican Superconductor Corp /De/10 Feb 2021
  • SC 13GAmerican Superconductor Corp /De/12 Feb 2020

CHARTH SA(2)

  • SC 13D/AAmerican Superconductor Corp /De/7 Oct 1999
  • SC 13DAmerican Superconductor Corp /De/17 Oct 1997

EDF CAPITAL INVESTISSEMENT SA(2)

  • SC 13D/AAmerican Superconductor Corp /De/25 Feb 2004
  • SC 13DAmerican Superconductor Corp /De/8 Oct 1999

INTEGRATED CORE STRATEGIES (US) LLC(2)

  • SC 13G/AAmerican Superconductor Corp /De/4 Feb 2020
  • SC 13GAmerican Superconductor Corp /De/24 Jun 2019

VANGUARD CAPITAL MANAGEMENT LLC(2)

  • SC 13G/AAmerican Superconductor Corp /De/31 Jul
  • SC 13GAmerican Superconductor Corp /De/29 Apr

FRONTIER CAPITAL MANAGEMENT CO INC /ADV(1)

  • SC 13GAmerican Superconductor Corp /De/15 Feb 2000

IRONBRIDGE CAPITAL MANAGEMENT LLC(1)

  • SC 13GAmerican Superconductor Corp /De/11 Feb 2005

Insider Ownership

McGahn Daniel P(68)

  • Form 4Statement of changes in beneficial ownership11 Jun
  • Form 4Statement of changes in beneficial ownership10 Jun
  • Form 4Statement of changes in beneficial ownership3 Jun
  • Form 4Statement of changes in beneficial ownership6 Aug 2025
  • Form 4Statement of changes in beneficial ownership12 Jun 2025
  • Form 4Statement of changes in beneficial ownership9 Jun 2025
  • Form 4Statement of changes in beneficial ownership29 May 2025
  • Form 4Statement of changes in beneficial ownership22 May 2025
  • Form 4Statement of changes in beneficial ownership19 May 2025
  • Form 4Statement of changes in beneficial ownership1 Oct 2024

YUREK GREGORY J(62)

  • Form 4Statement of changes in beneficial ownership2 Jun 2011
  • Form 5Annual statement of beneficial ownership2 Jun 2011
  • Form 4Statement of changes in beneficial ownership13 Oct 2010
  • Form 4Statement of changes in beneficial ownership8 Oct 2010
  • Form 4Statement of changes in beneficial ownership16 Sep 2010
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 5Annual statement of beneficial ownership9 Apr 2010
  • Form 4Statement of changes in beneficial ownership8 Feb 2010
  • Form 4Statement of changes in beneficial ownership7 Jan 2010
  • Form 4Statement of changes in beneficial ownership4 Jan 2010

Kosiba John W JR(52)

  • Form 4Statement of changes in beneficial ownership11 Jun
  • Form 4Statement of changes in beneficial ownership10 Jun
  • Form 4Statement of changes in beneficial ownership3 Jun
  • Form 4Statement of changes in beneficial ownership6 Aug 2025
  • Form 4Statement of changes in beneficial ownership12 Jun 2025
  • Form 4Statement of changes in beneficial ownership9 Jun 2025
  • Form 4Statement of changes in beneficial ownership29 May 2025
  • Form 4Statement of changes in beneficial ownership22 May 2025
  • Form 4Statement of changes in beneficial ownership19 May 2025
  • Form 4Statement of changes in beneficial ownership6 Nov 2024

MALOZEMOFF ALEXIS P(35)

  • Form 4Statement of changes in beneficial ownership19 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership13 May 2009
  • Form 4Statement of changes in beneficial ownership5 May 2009
  • Form 4Statement of changes in beneficial ownership28 Apr 2009
  • Form 4Statement of changes in beneficial ownership19 Feb 2009
  • Form 4Statement of changes in beneficial ownership3 Oct 2008
  • Form 4Statement of changes in beneficial ownership5 Sep 2008

DOUGLAS KEVIN(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

HENRY DAVID A(29)

  • Form 4Statement of changes in beneficial ownership22 Aug 2016
  • Form 4Statement of changes in beneficial ownership20 Jun 2016
  • Form 4Statement of changes in beneficial ownership17 May 2016
  • Form 4Statement of changes in beneficial ownership10 May 2016
  • Form 4Statement of changes in beneficial ownership7 Apr 2016
  • Form 4Statement of changes in beneficial ownership4 Aug 2015
  • Form 4Statement of changes in beneficial ownership15 May 2015
  • Form 4Statement of changes in beneficial ownership12 May 2015
  • Form 4Statement of changes in beneficial ownership4 Aug 2014
  • Form 4Statement of changes in beneficial ownership26 Jun 2014

DOUGLAS FAMILY TRUST(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

JAMES & JEAN DOUGLAS IRREVOCABLE DESCENDANTS TRUST(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

DOUGLAS JAMES E III(29)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

BUDHRAJA VIKRAM S(26)

  • Form 4Statement of changes in beneficial ownership13 Jun 2022
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership9 Dec 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership4 Apr 2019
  • Form 4Statement of changes in beneficial ownership6 Apr 2018
  • Form 4Statement of changes in beneficial ownership12 May 2017
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership5 Apr 2016

OLIVER DAVID R JR(24)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership26 Feb
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership13 Nov 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2019

STANKIEWICZ CHARLES W(22)

  • Form 4Statement of changes in beneficial ownership25 Aug 2011
  • Form 4Statement of changes in beneficial ownership16 May 2011
  • Form 5Annual statement of beneficial ownership8 Apr 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 5Annual statement of beneficial ownership9 Apr 2010
  • Form 4Statement of changes in beneficial ownership31 Jul 2009
  • Form 4Statement of changes in beneficial ownership12 Jun 2009
  • Form 4Statement of changes in beneficial ownership9 Jun 2009
  • Form 4Statement of changes in beneficial ownership14 May 2009
  • Form 4Statement of changes in beneficial ownership30 May 2008

SANDE JOHN VANDER(21)

  • Form 4Statement of changes in beneficial ownership8 Aug 2017
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership29 Nov 2016
  • Form 4Statement of changes in beneficial ownership5 Apr 2016
  • Form 4Statement of changes in beneficial ownership6 Feb 2015
  • Form 4Statement of changes in beneficial ownership8 Apr 2015
  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership10 Dec 2013
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012

Douglas Michelle(18)

  • Form 4Statement of changes in beneficial ownership4 May 2015
  • Form 4MAIN DOCUMENT DESCRIPTION13 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION8 Feb 2013
  • Form 4MAIN DOCUMENT DESCRIPTION4 Dec 2012
  • Form 4MAIN DOCUMENT DESCRIPTION29 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION26 Nov 2012
  • Form 4MAIN DOCUMENT DESCRIPTION3 Oct 2011
  • Form 4Statement of changes in beneficial ownership6 Apr 2011
  • Form 4Statement of changes in beneficial ownership24 Mar 2011
  • Form 4Statement of changes in beneficial ownership21 Mar 2011

WOOD JOHN W JR(17)

  • Form 4Statement of changes in beneficial ownership24 May 2019
  • Form 4Statement of changes in beneficial ownership4 Apr 2019
  • Form 4Statement of changes in beneficial ownership6 Apr 2018
  • Form 4Statement of changes in beneficial ownership12 May 2017
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership5 Apr 2016
  • Form 4Statement of changes in beneficial ownership8 Apr 2015
  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012

SANTAMARIA ANGELO R(16)

  • Form 4Statement of changes in beneficial ownership12 Aug 2011
  • Form 4Statement of changes in beneficial ownership17 May 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 4Statement of changes in beneficial ownership8 Feb 2010
  • Form 4Statement of changes in beneficial ownership4 Jun 2009
  • Form 4Statement of changes in beneficial ownership14 May 2009
  • Form 4Statement of changes in beneficial ownership7 May 2009
  • Form 4Statement of changes in beneficial ownership3 Jul 2008
  • Form 4Statement of changes in beneficial ownership30 May 2008
  • Form 4Statement of changes in beneficial ownership21 May 2008

DROUIN RICHARD(15)

  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012
  • Form 4Statement of changes in beneficial ownership15 Dec 2011
  • Form 4Statement of changes in beneficial ownership13 Aug 2010
  • Form 4Statement of changes in beneficial ownership12 Aug 2009
  • Form 4Statement of changes in beneficial ownership14 Aug 2008
  • Form 4Statement of changes in beneficial ownership4 Jun 2008
  • Form 4Statement of changes in beneficial ownership4 Jun 2008
  • Form 4Statement of changes in beneficial ownership3 Jun 2008

Maguire James F(15)

  • Form 4Statement of changes in beneficial ownership22 Aug 2016
  • Form 4Statement of changes in beneficial ownership20 May 2016
  • Form 4Statement of changes in beneficial ownership17 May 2016
  • Form 4Statement of changes in beneficial ownership10 May 2016
  • Form 4Statement of changes in beneficial ownership4 Aug 2015
  • Form 4Statement of changes in beneficial ownership15 May 2015
  • Form 4Statement of changes in beneficial ownership12 May 2015
  • Form 4Statement of changes in beneficial ownership29 Aug 2014
  • Form 4Statement of changes in beneficial ownership4 Aug 2014
  • Form 4Statement of changes in beneficial ownership2 Aug 2013

House Arthur H(13)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership8 Aug 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership4 Apr 2019
  • Form 4Statement of changes in beneficial ownership6 Apr 2018

DiCecco Susan J(12)

  • Form 4Statement of changes in beneficial ownership3 Jan 2013
  • Form 4Statement of changes in beneficial ownership26 Oct 2012
  • Form 4Statement of changes in beneficial ownership28 Jun 2012
  • Form 4Statement of changes in beneficial ownership15 May 2012
  • Form 4Statement of changes in beneficial ownership10 May 2012
  • Form 4Statement of changes in beneficial ownership28 Sep 2011
  • Form 4Statement of changes in beneficial ownership16 May 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 4Statement of changes in beneficial ownership18 Dec 2009
  • Form 4Statement of changes in beneficial ownership6 Nov 2009

BACIOCCO ALBERT J JR(10)

  • Form 4Statement of changes in beneficial ownership21 May 2007
  • Form 4Statement of changes in beneficial ownership21 May 2007
  • Form 4Statement of changes in beneficial ownership23 Mar 2007
  • Form 4Statement of changes in beneficial ownership16 Mar 2007
  • Form 4Statement of changes in beneficial ownership2 Aug 2006
  • Form 4Statement of changes in beneficial ownership3 Aug 2005
  • Form 4Statement of changes in beneficial ownership3 Aug 2004
  • Form 4Statement of changes in beneficial ownership25 Feb 2004
  • Form 4Statement of changes in beneficial ownership20 Feb 2004
  • Form 4Statement of changes in beneficial ownership8 Oct 2003

CRISP PETER O(10)

  • Form 4Statement of changes in beneficial ownership15 Dec 2011
  • Form 4Statement of changes in beneficial ownership13 Aug 2010
  • Form 4Statement of changes in beneficial ownership12 Aug 2009
  • Form 4Statement of changes in beneficial ownership14 Aug 2008
  • Form 4Statement of changes in beneficial ownership30 Jul 2008
  • Form 4Statement of changes in beneficial ownership10 Aug 2007
  • Form 4Statement of changes in beneficial ownership2 Aug 2006
  • Form 4Statement of changes in beneficial ownership3 Aug 2005
  • Form 4Statement of changes in beneficial ownership3 Aug 2004
  • Form 4Statement of changes in beneficial ownership8 Oct 2003

LENEHAN PAMELA F(10)

  • Form 4Statement of changes in beneficial ownership30 Jul 2018
  • Form 4Statement of changes in beneficial ownership6 Apr 2018
  • Form 4Statement of changes in beneficial ownership7 Apr 2017
  • Form 4Statement of changes in beneficial ownership5 Apr 2016
  • Form 4Statement of changes in beneficial ownership8 Apr 2015
  • Form 4Statement of changes in beneficial ownership3 Apr 2014
  • Form 4Statement of changes in beneficial ownership8 Aug 2013
  • Form 4Statement of changes in beneficial ownership3 Aug 2012
  • Form 4Statement of changes in beneficial ownership15 Mar 2011
  • Form 3Initial statement of beneficial ownership15 Mar 2011

Poor Timothy D.(10)

  • Form 4Statement of changes in beneficial ownership3 Jan 2013
  • Form 4Statement of changes in beneficial ownership26 Oct 2012
  • Form 4Statement of changes in beneficial ownership10 May 2012
  • Form 4Statement of changes in beneficial ownership28 Sep 2011
  • Form 4Statement of changes in beneficial ownership16 May 2011
  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 4Statement of changes in beneficial ownership16 Dec 2009
  • Form 4Statement of changes in beneficial ownership14 May 2009
  • Form 4Statement of changes in beneficial ownership16 May 2008
  • Form 3Initial statement of beneficial ownership15 May 2008

Littlefield Barbara G.(10)

  • Form 4Statement of changes in beneficial ownership21 Sep
  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Apr 2022
  • Form 4Statement of changes in beneficial ownership7 Apr 2021
  • Form 4Statement of changes in beneficial ownership7 Apr 2020
  • Form 4Statement of changes in beneficial ownership29 May 2019
  • Form 3Initial statement of beneficial ownership29 May 2019

Dambier Laura A.(7)

  • Form 4Statement of changes in beneficial ownership12 Jun
  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 3Initial statement of beneficial ownership13 Jun 2022
  • Form 4Statement of changes in beneficial ownership14 Jun 2022

Klein Margaret D.(7)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership4 Apr 2025
  • Form 4Statement of changes in beneficial ownership4 Apr 2024
  • Form 4Statement of changes in beneficial ownership7 Apr 2023
  • Form 4Statement of changes in beneficial ownership6 Aug 2025
  • Form 3Initial statement of beneficial ownership13 Jun 2022
  • Form 4Statement of changes in beneficial ownership14 Jun 2022

SAGE ANDREW G C II(5)

  • Form 4Statement of changes in beneficial ownership14 Mar 2007
  • Form 4Statement of changes in beneficial ownership2 Aug 2006
  • Form 4Statement of changes in beneficial ownership3 Aug 2005
  • Form 4Statement of changes in beneficial ownership3 Aug 2004
  • Form 4Statement of changes in beneficial ownership8 Oct 2003

ROSA THOMAS M(4)

  • Form 4Statement of changes in beneficial ownership16 Mar 2007
  • Form 4Statement of changes in beneficial ownership21 Mar 2006
  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership28 Apr 2004

PARATORE DAVID(3)

  • Form 4Statement of changes in beneficial ownership27 Jun 2005
  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership11 Mar 2004

KARON STUART(3)

  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership28 Apr 2004
  • Form 3Initial statement of beneficial ownership30 Jan 2004

Winter Terry M(3)

  • Form 4Statement of changes in beneficial ownership28 Jul 2006
  • Form 3Initial statement of beneficial ownership29 Jul 2005
  • Form 4Statement of changes in beneficial ownership29 Jul 2005

Donnelly Terence Robert(3)

  • Form 4Statement of changes in beneficial ownership7 Apr
  • Form 4Statement of changes in beneficial ownership29 May 2025
  • Form 3Initial statement of beneficial ownership29 May 2025

GIBSON ROSS S(2)

  • Form 4Statement of changes in beneficial ownership9 Jun 2004
  • Form 4Statement of changes in beneficial ownership28 Apr 2004

BISSON KEVIN M(2)

  • Form 4Statement of changes in beneficial ownership6 May 2005
  • Form 4Statement of changes in beneficial ownership28 Apr 2004

Collett John R(2)

  • Form 4Statement of changes in beneficial ownership14 May 2010
  • Form 3Initial statement of beneficial ownership13 May 2010

MENJON GERARD(1)

  • Form 4Statement of changes in beneficial ownership8 Oct 2003

≥5% Ownership

BlackRock Inc.(16)

  • SC 13GAmerican Superconductor Corp /De/8 Jul 2022
  • SC 13G/AAmerican Superconductor Corp /De/1 Feb 2022
  • SC 13G/AAmerican Superconductor Corp /De/29 Jan 2021
  • SC 13GAmerican Superconductor Corp /De/7 Feb 2020
  • SC 13G/AAmerican Superconductor Corp /De/10 Jul 2014
  • SC 13GAmerican Superconductor Corp /De/28 Jan 2014
  • SC 13G/AAmerican Superconductor Corp /De/10 Dec 2013
  • SC 13G/AAmerican Superconductor Corp /De/8 Feb 2013
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2012
  • SC 13G/AAmerican Superconductor Corp /De/8 Aug 2011

DOUGLAS KEVIN(15)

  • SC 13G/AAmerican Superconductor Corp /De/19 Jun 2020
  • SC 13GAmerican Superconductor Corp /De/27 Jan 2020
  • SC 13D/AAmerican Superconductor Corp /De/5 May 2015
  • SC 13D/AAmerican Superconductor Corp /De/14 Feb 2013
  • SC 13D/AAmerican Superconductor Corp /De/1 Feb 2012
  • SC 13D/AAmerican Superconductor Corp /De/7 Oct 2011
  • SC 13DAmerican Superconductor Corp /De/11 Apr 2011
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2011
  • SC 13G/AAmerican Superconductor Corp /De/8 Mar 2010
  • SC 13G/AAmerican Superconductor Corp /De/29 Jan 2010

AWM Investment Company, Inc.(10)

  • SC 13G/AAmerican Superconductor Corp /De/9 Aug 2024
  • SC 13G/AAmerican Superconductor Corp /De/14 Feb 2024
  • SC 13GAmerican Superconductor Corp /De/14 Feb 2023
  • SC 13G/AAmerican Superconductor Corp /De/8 Jan 2021
  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2020
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/13 Feb 2018
  • SC 13G/AAmerican Superconductor Corp /De/8 Sep 2017
  • SC 13G/AAmerican Superconductor Corp /De/10 Feb 2017
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2016

FMR LLC(9)

  • SC 13G/AAmerican Superconductor Corp /De/10 Jun 2011
  • SC 13G/AAmerican Superconductor Corp /De/14 Feb 2011
  • SC 13GAmerican Superconductor Corp /De/16 Feb 2010
  • SC 13G/AAmerican Superconductor Corp /De/17 Feb 2009
  • SC 13G/AAmerican Superconductor Corp /De/10 Nov 2008
  • SC 13G/AAmerican Superconductor Corp /De/14 Feb 2008
  • SC 13GAmerican Superconductor Corp /De/13 Nov 2007
  • SC 13G/AAmerican Superconductor Corp /De/9 Feb 1998
  • SC 13GAmerican Superconductor Corp /De/10 Feb 1997

STATE OF WISCONSIN INVESTMENT BOARD(7)

  • SC 13G/AAmerican Superconductor Corp /De/6 May 2003
  • SC 13G/AAmerican Superconductor Corp /De/9 Apr 2003
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2003
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2002
  • SC 13G/AAmerican Superconductor Corp /De/9 Feb 2001
  • SC 13G/AAmerican Superconductor Corp /De/25 Jan 2000
  • SC 13GAmerican Superconductor Corp /De/2 Feb 1999

Invesco Ltd.(6)

  • SC 13G/AAmerican Superconductor Corp /De/8 Feb 2023
  • SC 13G/AAmerican Superconductor Corp /De/9 Feb 2022
  • SC 13GAmerican Superconductor Corp /De/16 Feb 2021
  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2009
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2008
  • SC 13GAmerican Superconductor Corp /De/14 Feb 2007

BAILLIE GIFFORD & CO(6)

  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2025
  • SC 13G/AAmerican Superconductor Corp /De/4 Nov 2024
  • SC 13G/AAmerican Superconductor Corp /De/30 Jan 2024
  • SC 13G/AAmerican Superconductor Corp /De/5 Jul 2023
  • SC 13G/AAmerican Superconductor Corp /De/19 Jan 2023
  • SC 13GAmerican Superconductor Corp /De/18 Jan 2022

VANGUARD GROUP INC(4)

  • SC 13G/AAmerican Superconductor Corp /De/26 Mar
  • SC 13G/AAmerican Superconductor Corp /De/30 Jan
  • SC 13G/AAmerican Superconductor Corp /De/12 Nov 2024
  • SC 13GAmerican Superconductor Corp /De/4 Nov 2024

CAPITAL GROUP INTERNATIONAL INC(4)

  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2003
  • SC 13G/AAmerican Superconductor Corp /De/11 Feb 2002
  • SC 13G/AAmerican Superconductor Corp /De/12 Feb 2001
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2000

CAPITAL VENTURES INTERNATIONAL(4)

  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2015
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2014
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2013
  • SC 13GAmerican Superconductor Corp /De/31 Dec 2012

BlackRock, Inc.(4)

  • SC 13G/AAmerican Superconductor Corp /De/17 Apr 2025
  • SC 13G/AAmerican Superconductor Corp /De/5 Feb 2025
  • SC 13GAmerican Superconductor Corp /De/8 Nov 2024
  • SC 13GAmerican Superconductor Corp /De/22 Oct 2024

MASSACHUSETTS FINANCIAL SERVICES CO /MA/(3)

  • SC 13GAmerican Superconductor Corp /De/4 Feb 2005
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2004
  • SC 13GAmerican Superconductor Corp /De/10 Nov 2003

SOROS FUND MANAGEMENT LLC(3)

  • SC 13G/AAmerican Superconductor Corp /De/1 Jul 1998
  • SC 13GAmerican Superconductor Corp /De/6 Mar 1998
  • SC 13DAmerican Superconductor Corp /De/8 Jan 1997

HIRSCHMAN ORIN(3)

  • SC 13G/AAmerican Superconductor Corp /De/8 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/8 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/5 Oct 2018

SATTERFIELD THOMAS A JR(3)

  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2020
  • SC 13G/AAmerican Superconductor Corp /De/13 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/8 Mar 2018

Footprints Asset Management & Research(3)

  • SC 13GAmerican Superconductor Corp /De/14 Feb 2022
  • SC 13GAmerican Superconductor Corp /De/14 Feb 2019
  • SC 13GAmerican Superconductor Corp /De/12 Feb 2016

MERRILL LYNCH ASSET MANAGEMENT INC(2)

  • SC 13G/AAmerican Superconductor Corp /De/7 Feb 2006
  • SC 13GAmerican Superconductor Corp /De/8 Nov 2005

DIMENSIONAL FUND ADVISORS INC(2)

  • SC 13G/AAmerican Superconductor Corp /De/6 Feb 2004
  • SC 13GAmerican Superconductor Corp /De/11 Feb 2003

ARDSLEY ADVISORY PARTNERS(2)

  • SC 13G/AAmerican Superconductor Corp /De/26 Jan 2018
  • SC 13GAmerican Superconductor Corp /De/8 May 2017

ROYCE & ASSOCIATES LP(2)

  • SC 13G/AAmerican Superconductor Corp /De/30 Jan 2024
  • SC 13GAmerican Superconductor Corp /De/31 Jan 2023

RENAISSANCE TECHNOLOGIES LLC(2)

  • SC 13G/AAmerican Superconductor Corp /De/10 Feb 2021
  • SC 13GAmerican Superconductor Corp /De/12 Feb 2020

CHARTH SA(2)

  • SC 13D/AAmerican Superconductor Corp /De/7 Oct 1999
  • SC 13DAmerican Superconductor Corp /De/17 Oct 1997

EDF CAPITAL INVESTISSEMENT SA(2)

  • SC 13D/AAmerican Superconductor Corp /De/25 Feb 2004
  • SC 13DAmerican Superconductor Corp /De/8 Oct 1999

INTEGRATED CORE STRATEGIES (US) LLC(2)

  • SC 13G/AAmerican Superconductor Corp /De/4 Feb 2020
  • SC 13GAmerican Superconductor Corp /De/24 Jun 2019

VANGUARD CAPITAL MANAGEMENT LLC(2)

  • SC 13G/AAmerican Superconductor Corp /De/31 Jul
  • SC 13GAmerican Superconductor Corp /De/29 Apr

FRONTIER CAPITAL MANAGEMENT CO INC /ADV(1)

  • SC 13GAmerican Superconductor Corp /De/15 Feb 2000

IRONBRIDGE CAPITAL MANAGEMENT LLC(1)

  • SC 13GAmerican Superconductor Corp /De/11 Feb 2005