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Disclosery

AMSC AMERICAN SUPERCONDUCTOR CORP

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SHS NEW (common), issuer CIK 880807

236 managers (240 13F filers) reported a position in AMSC shares at 2025-12-31, 33,072,852 shares in all. 35 filers opened a position and 70 filers sold out during the quarter.

Managers
236
13F filers
240
New
35
Added
106
Reduced
64
Sold out
70
Shares held by filers
33,072,852

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.3,750,403$108M<0.01%+121,10713F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding3,526,632$101M+573,446Timeline
BAILLIE GIFFORD & COin group BAILLIE GIFFORD & CO1,506,841$43.4M0.04%+79,50913F-HRTimelineGroup
EMERALD ADVISERS, LLCgroup of 2 filers holding1,192,814$34.3M+363,894Timeline
STATE STREET CORPin group STATE STREET CORP1,192,093$34.3M<0.01%+56,21513F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC1,090,710$31.4M<0.01%+20,85513F-HRTimelineGroup
Atreides Management, LP1,044,193$30.1M0.64%+272,69813F-HRTimeline
Nuveen, LLCin group TIAA960,968$27.7M0.01%+134,81613F-HRTimelineGroup
OBERWEIS ASSET MANAGEMENT INC/835,900$24.1M0.88%+170,20013F-HRTimeline
UBS Group AGgroup of 2 filers holding821,770$23.7M+545,399Timeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC782,287$22.5M<0.01%-391,82013F-HR/ATimelineGroup
AWM Investment Company, Inc.754,220$21.7M2.1%+8,75013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY705,442$20.3M<0.01%+369,67713F-HR/ATimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …683,202$19.7M0.01%-77,25513F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP682,967$19.7M0.01%+224,57613F-HRTimelineGroup
Telemark Asset Management, LLC619,900$17.8M1.78%-70,10013F-HRTimeline
Qube Research & Technologies Ltd599,006$17.2M0.02%+341,41113F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP540,253$15.5M<0.01%+68,76913F-HRTimelineGroup
Driehaus Capital Management LLC499,984$14.4M0.1%-718,96013F-HRTimeline
ALGERT GLOBAL LLC460,771$13.3M0.21%+172,89113F-HR/ATimeline
NOMURA ASSET MANAGEMENT INTERNATIONAL I…in group NOMURA ASSET MANAGEMENT CO LTD459,786$13.2M0.02%13F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.443,148$12.8M0.01%-309,55513F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co387,507$11.2M<0.01%-71913F-HRTimelineGroup
ROYCE & ASSOCIATES LP387,069$11.1M0.11%+29,48913F-HRTimeline
Invesco Ltd.in group Invesco Ltd.386,152$11.1M<0.01%+100,74613F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding368,671$10.6M+232,648Timeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP360,806$10.4M<0.01%-31,46113F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC337,713$9.72M0.01%+322,89213F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc278,026$8M<0.01%+18,46313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/274,844$7.91M<0.01%-121,48813F-HRTimeline
PANAGORA ASSET MANAGEMENT INC254,785$7.33M0.03%+52,19113F-HRTimeline
TUDOR INVESTMENT CORP ET AL251,642$7.24M0.04%+76,60313F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC242,767$6.99M0.01%+106,66513F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …204,678$6.46M0.01%+5,10713F-HRTimelineGroup
ESSEX INVESTMENT MANAGEMENT CO LLC215,154$6.19M0.94%-30,42713F-HRTimeline
Stephens Investment Management Group LLCgroup of 2 filers holding174,228$5.01M+97,817Timeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/165,568$4.77M<0.01%-32,46213F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management152,795$4.4M0.01%new13F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC145,965$4.2M<0.01%-22,78613F-HRTimelineGroup
Palisades Investment Partners, LLC144,209$4.15M1.57%+3,10013F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC141,811$4.08M<0.01%-25,50513F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC139,989$4.03M0.01%-184,00013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp137,042$3.94M<0.01%+3,52213F-HRTimelineGroup
Baird Financial Group, Inc.in group Baird Financial Group, Inc.134,899$3.88M0.01%+54,10913F-HRTimelineGroup
AXIOM INVESTORS LLC /DE134,076$3.86M0.03%-130,58413F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN133,918$3.85M<0.01%-83,90813F-HRTimelineGroup
FMR LLCin group FMR LLC124,406$3.58M<0.01%+23,56413F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO123,103$3.54M<0.01%+8,21513F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd120,251$3.46M0.08%new13F-HRTimeline
ArrowMark Colorado Holdings LLC110,432$3.18M0.07%013F-HRTimeline
Swiss National Bank89,100$2.56M<0.01%+4,50013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS82,502$2.37M<0.01%+19,49313F-HRTimelineGroup
CAPITAL FUND MANAGEMENT S.A.79,160$2.28M0.02%+13,62513F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO78,810$2.27M<0.01%+12,61213F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC78,088$2.25M<0.01%-44,41413F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.77,457$2.23M<0.01%+44,23413F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC76,882$2.21M<0.01%+35,49313F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC73,805$2.12M<0.01%+11,24213F-HRTimelineGroup
Lumbard & Kellner, LLC71,161$2.05M0.72%-1,27813F-HRTimeline
SG Americas Securities, LLC70,992$2.04M<0.01%+39,16913F-HRTimeline
ExodusPoint Capital Management, LP70,751$2.04M0.02%new13F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND70,400$2.03M<0.01%+1,70013F-HRTimeline
HRT FINANCIAL LP69,724$2.01M0.01%+63,53013F-HRTimeline
Dynamic Technology Lab Private Ltd69,225$1.99M0.45%new13F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding67,586$1.95M+20,235Timeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…65,625$1.89M<0.01%-61,54613F-HRTimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC64,625$1.86M0.04%+2413F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC64,520$1.86M0.01%new13F-HRTimelineGroup
CAMPBELL NEWMAN ASSET MANAGEMENT INC63,148$1.82M0.13%-2,21713F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC62,242$1.79M0.01%-4,08313F-HRTimelineGroup
Aquatic Capital Management LLC61,352$1.77M0.05%+7,47913F-HRTimeline
Campbell & CO Investment Adviser LLC59,952$1.73M0.08%new13F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC58,956$1.7M<0.01%+39,93513F-HRTimelineGroup
RHUMBLINE ADVISERS57,693$1.66M<0.01%-12,73213F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC25,637$1.51M0.01%013F-HRTimeline
TWINBEECH CAPITAL LP52,221$1.5M0.11%new13F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…50,911$1.47M<0.01%+23413F-HRTimeline
RICE HALL JAMES & ASSOCIATES, LLC47,114$1.36M0.07%-13,61013F-HRTimeline
Janney Montgomery Scott LLC46,381$1.33M<0.01%+65013F-HRTimeline
Amundiin group Amundi46,316$1.33M<0.01%+4,58613F-HRTimelineGroup
Freestone Grove Partners LP46,128$1.33M0.01%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA45,133$1.3M<0.01%+1,77013F-HRTimelineGroup
Legato Capital Management LLC40,687$1.17M0.1%-18,16113F-HRTimeline
MACKENZIE FINANCIAL CORP40,245$1.16M<0.01%+5,95613F-HRTimeline
LPL Financial LLC40,074$1.15M<0.01%-8,61913F-HRTimeline
Cambridge Investment Research Advisors,…39,600$1.14M<0.01%+4,52313F-HRTimeline
ALLIANCEBERNSTEIN L.P.39,320$1.13M<0.01%013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\38,723$1.11M<0.01%+2,58913F-HRTimelineGroup
Merit Financial Group, LLC37,281$1.07M0.01%+5,42613F-HRTimeline
Verition Fund Management LLC37,200$1.07M0.01%-33,98613F-HRTimeline
Engineers Gate Manager LP36,587$1.05M0.01%-60,90813F-HRTimeline
KORNITZER CAPITAL MANAGEMENT INC /KS36,154$1.04M0.02%+3,15413F-HRTimeline
Man Group plcin group Man Group plc36,094$1.04M<0.01%+19,98013F-HRTimelineGroup
NATIXISin group Natixis Investment Managers35,086$1.01M<0.01%new13F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources35,072$1.01M<0.01%+34,80613F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…35,065$1.01M<0.01%+12,67213F-HRTimelineGroup
Headlands Technologies LLC34,308$987K0.08%new13F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth34,303$987K<0.01%+1,38413F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…32,814$944K<0.01%+2,74713F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP32,700$941K<0.01%+7,20013F-HRTimelineGroup
Schonfeld Strategic Advisors LLC31,166$897K<0.01%+15,05613F-HRTimeline
Quantum Private Wealth, LLC29,223$841K0.25%013F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC26,695$768K<0.01%-144,91113F-HRTimeline
JOURNEY STRATEGIC WEALTH LLC26,397$760K0.02%new13F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC26,096$751K0.01%+6,08913F-HRTimeline
VIRTUS ADVISERS, LLCin group Virtus Investment Advisers, L…25,990$748K0.35%013F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…25,405$731K<0.01%013F-HRTimelineGroup
STATE BOARD OF ADMINISTRATION OF FLORID…24,264$698K<0.01%013F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC24,185$696K<0.01%+18,22313F-HRTimelineGroup
POLEN CAPITAL MANAGEMENT LLC23,565$678K<0.01%-23,72613F-HRTimeline
Skyview Financial Group LLC23,038$663K0.68%13F-HRTimeline
ALPINE WOODS CAPITAL INVESTORS, LLCin group ALPINE WOODS CAPITAL INVESTOR…23,026$663K0.16%new13F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…22,360$644K<0.01%+4,55413F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD21,800$627K<0.01%+20,60013F-HRTimeline
GLOBEFLEX CAPITAL L P21,633$623K0.1%new13F-HRTimeline
Dorsey & Whitney Trust CO LLC21,611$622K0.03%013F-HRTimeline
STRS OHIO21,200$610K<0.01%+4,80013F-HRTimeline
OXFORD ASSET MANAGEMENT LLP21,186$610K0.22%+15,48313F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
CREDIT AGRICOLE S Ain group CREDIT AGRICOLE S A21,045$606K<0.01%-49013F-HRTimelineGroup
TEACHER RETIREMENT SYSTEM OF TEXAS20,999$604K<0.01%+7,85113F-HRTimeline
Mariner, LLCin group Mariner, LLC20,563$592K<0.01%+7,33613F-HRTimelineGroup
NISSAY ASSET MANAGEMENT CORP /JAPAN20,502$590K<0.01%+12,43713F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …20,424$588K<0.01%-2,18313F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson20,134$580K<0.01%-19,21613F-HRTimelineGroup
Hennion & Walsh Asset Management, Inc.19,355$557K0.02%-35613F-HRTimeline
AXQ CAPITAL, LP18,931$545K0.12%+11,26413F-HRTimeline
GoalVest Advisory LLC17,900$515K0.1%-50013F-HRTimeline
TFC Financial Management, Inc.16,741$482K0.06%-10113F-HRTimeline
VIRGINIA RETIREMENT SYSTEMS ET Al16,500$475K<0.01%new13F-HRTimeline
Advisory Services Network, LLC16,396$472K0.01%-13313F-HRTimeline
Traynor Capital Management, Inc.16,157$465K0.03%-25313F-HRTimeline
Truvestments Capital LLC15,450$445K0.08%+1,92013F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.14,944$430K0.07%-3,91713F-HRTimeline
Mitsubishi UFJ Asset Management Co., Lt…in group Mitsubishi UFJ Trust & Bankin…13,277$419K<0.01%+1,46913F-HRTimelineGroup
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC14,363$413K<0.01%+13413F-HRTimelineGroup
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …14,181$408K<0.01%-64,89813F-HRTimelineGroup
Brooklyn Investment Group13,863$405K0.02%new13F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC13,990$403K0.01%new13F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC14,061$402K<0.01%+12,46613F-HRTimelineGroup
F/m Investments LLC13,470$388K0.01%new13F-HRTimeline
Entropy Technologies, LP13,457$387K0.02%+3,05613F-HRTimeline
Quantinno Capital Management LP12,942$372K<0.01%+7,37713F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM12,524$360K<0.01%-35913F-HRTimeline
DIVERSIFIED TRUST CO12,311$354K0.01%+2,81113F-HRTimeline
ProShare Advisors LLC11,654$335K<0.01%+3,02013F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC11,582$334K<0.01%+2,62513F-HR/ATimelineGroup
Police & Firemen's Retirement System of…11,442$329K<0.01%-62513F-HRTimeline
Cetera Investment Advisers11,425$329K<0.01%-58,94113F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD11,227$323K<0.01%+4,82313F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.11,206$323K<0.01%-101,99413F-HRTimelineGroup
Fund Advisors of America Inc/FL11,053$318K0.29%13F-HRTimeline
Round Rock Advisors LLC10,709$308K0.05%new13F-HR/ATimeline
XTX Topco Ltdin group XTX Topco Ltd10,551$304K0.01%new13F-HRTimelineGroup
HighTower Advisors, LLC10,479$302K<0.01%+4,64913F-HRTimeline
ROI Financial Advisors, LLC10,133$292K0.17%+71413F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC10,097$291K<0.01%-3,80813F-HRTimeline
Graham Capital Management, L.P.10,066$290K0.01%new13F-HRTimeline
PDT Partners, LLC9,732$280K0.02%new13F-HRTimeline
KLP KAPITALFORVALTNING AS9,400$271K<0.01%013F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd9,385$270K0.01%new13F-HRTimelineGroup
Assenagon Asset Management S.A.8,889$256K<0.01%-1,14213F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\8,760$252K<0.01%new13F-HRTimelineGroup
Handelsbanken Fonder AB8,600$248K<0.01%new13F-HRTimeline
Precision Wealth Strategies, LLC8,137$234K0.08%new13F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP7,851$226K<0.01%+2,01213F-HRTimelineGroup
CWM, LLCin group CWM, LLC7,752$223K<0.01%-72013F-HRTimelineGroup
City Center Advisors, LLC7,517$216K0.2%new13F-HRTimeline
AlphaQuest LLC7,175$206K0.01%+7,17313F-HRTimeline
D.A. DAVIDSON & CO.7,008$202K<0.01%+73113F-HRTimeline
Kingsview Wealth Management, LLC6,995$201K<0.01%+1,32513F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC6,923$199K<0.01%-2,99013F-HRTimelineGroup
State of Alaska, Department of Revenue6,146$176K<0.01%+4,04713F-HRTimeline
Steward Partners Investment Advisory, L…5,625$162K<0.01%+3,00013F-HRTimeline
Ensign Peak Advisors, Inc4,550$131K<0.01%-4,30013F-HR/ATimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…4,260$123K<0.01%-28213F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…3,652$105K<0.01%013F-HRTimelineGroup
GROUP ONE TRADING LLC3,041$87.5K<0.01%-43,86213F-HRTimeline
State of Wyoming3,021$86.9K0.01%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,891$83.2K<0.01%+1,26913F-HRTimelineGroup
SBI Securities Co., Ltd.2,693$77.5K<0.01%-71513F-HRTimeline
Federation des caisses Desjardins du Qu…2,625$75.5K<0.01%+1,92513F-HRTimeline
GPS Wealth Strategies Group, LLC2,275$65.5K0.06%-9,16213F-HRTimeline
Caitong International Asset Management …2,092$60.2K0.01%new13F-HR/ATimeline
Global Retirement Partners, LLC1,978$56.9K<0.01%-1,23413F-HRTimeline
KBC Group NVin group KBC Group NV1,613$46K<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC1,595$45.9K<0.01%-9,49913F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…1,563$45K<0.01%+49213F-HR/ATimelineGroup
AMALGAMATED BANK1,373$40K<0.01%+18813F-HRTimeline
Essential Partners LLC1,152$33.2K0.01%-14013F-HRTimeline
GAMMA Investing LLC1,081$31.1K<0.01%+9913F-HRTimeline
Lodestone Wealth Management LLC1,054$30.3K0.01%new13F-HRTimeline
NewEdge Advisors, LLC771$22.2K<0.01%-8,87013F-HRTimeline
Versant Capital Management, Inc746$21.5K<0.01%+11813F-HRTimeline
Allworth Financial LP716$20.6K<0.01%-1913F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …700$20K<0.01%+24513F-HRTimelineGroup
Farther Finance Advisors, LLC567$16.3K<0.01%+56213F-HRTimeline
NISA INVESTMENT ADVISORS, LLC529$15.2K<0.01%013F-HRTimeline
CoreCap Advisors, LLC484$13.9K<0.01%new13F-HRTimeline
SWAN Capital LLC400$11.5K<0.01%013F-HRTimeline
Clearstead Trust, LLC393$11.3K<0.01%013F-HRTimeline