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Disclosery

AMSC AMERICAN SUPERCONDUCTOR CORP

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SHS NEW (common), issuer CIK 880807

266 managers (273 13F filers) reported a position in AMSC shares at 2025-09-30, 32,700,593 shares in all. 70 filers opened a position and 29 filers sold out during the quarter.

Managers
266
13F filers
273
New
70
Added
93
Reduced
81
Sold out
29
Shares held by filers
32,700,593

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, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, 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.3,629,296$216M<0.01%+209,25713F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding2,953,186$175M+506,139Timeline
BAILLIE GIFFORD & COin group BAILLIE GIFFORD & CO1,427,332$84.8M0.06%-25,34713F-HRTimelineGroup
Driehaus Capital Management LLC1,218,944$72.4M0.52%+379,09713F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,174,107$69.7M0.01%+145,06013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,135,878$67.5M<0.01%+115,71313F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC1,069,855$63.5M<0.01%+129,74413F-HRTimelineGroup
EMERALD ADVISERS, LLCgroup of 2 filers holding828,920$49.2M+114,952Timeline
Nuveen, LLCin group TIAA826,152$49.1M0.01%-171,75013F-HRTimelineGroup
FULLER & THALER ASSET MANAGEMENT, INC.809,945$48.1M0.16%new13F-HRTimeline
Atreides Management, LP771,495$45.8M1.19%-332,96313F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …760,457$45.2M0.03%+524,06113F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.752,703$44.7M0.04%+619,05913F-HRTimelineGroup
AWM Investment Company, Inc.745,470$44.3M4.15%-813,00813F-HRTimeline
Telemark Asset Management, LLC690,000$41M3.89%013F-HRTimeline
OBERWEIS ASSET MANAGEMENT INC/665,700$39.5M1.51%-2,50013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP471,484$28M0.01%-9,26913F-HRTimelineGroup
MACQUARIE GROUP LTDin group MACQUARIE GROUP LTD465,221$27.6M0.03%-356,95813F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP458,391$27.2M0.02%+120,81713F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…399,246$23.7M<0.01%-32,34313F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/396,332$23.5M<0.01%+368,47913F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP392,267$23.3M<0.01%+50,71813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co388,226$23.1M<0.01%+65,26813F-HRTimelineGroup
ROYCE & ASSOCIATES LP357,580$21.2M0.21%-454,15213F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY335,765$19.9M<0.01%-234,59113F-HR/ATimelineGroup
RENAISSANCE TECHNOLOGIES LLC323,989$19.2M0.03%new13F-HRTimeline
ALGERT GLOBAL LLC287,880$17.1M0.29%+82,17513F-HR/ATimeline
Invesco Ltd.in group Invesco Ltd.285,406$17M<0.01%+126,11413F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding276,371$16.4M-56,264Timeline
AXIOM INVESTORS LLC /DE264,660$15.7M0.12%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc259,563$15.4M<0.01%-157,47613F-HRTimelineGroup
Qube Research & Technologies Ltd257,595$15.3M0.02%+127,47513F-HRTimeline
ESSEX INVESTMENT MANAGEMENT CO LLC245,581$14.6M2.23%-100,46113F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN217,826$12.9M<0.01%-2,97013F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC202,594$12M0.05%+30,60613F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …199,571$11.8M0.02%-73,82513F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/198,030$11.8M<0.01%+28,88913F-HR/ATimelineGroup
TUDOR INVESTMENT CORP ET AL175,039$10.4M0.07%-85,08213F-HR/ATimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC171,606$10.2M0.03%new13F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC168,751$10M0.01%-13913F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC167,316$9.94M<0.01%+40213F-HRTimelineGroup
Palisades Investment Partners, LLC141,109$8.38M3.29%+61113F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC136,102$8.08M0.01%-28,00313F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding136,023$8.08M+13,173Timeline
CASTLEARK MANAGEMENT LLC135,617$8.05M0.23%+26,44713F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp133,520$7.93M<0.01%+12,66613F-HRTimelineGroup
NEXT CENTURY GROWTH INVESTORS LLC128,220$7.61M0.56%new13F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…127,171$7.55M0.01%+31,90613F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC122,502$7.28M0.01%-129,30513F-HRTimelineGroup
Lisanti Capital Growth, LLC118,151$7.02M1.72%-62,59913F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC117,498$6.98M0.09%-11,13713F-HR/ATimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO114,888$6.82M<0.01%+59,25113F-HR/ATimelineGroup
ArrowMark Colorado Holdings LLC110,432$6.56M0.12%-46,00013F-HRTimeline
GMT Capital Corp108,066$6.42M0.29%013F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC107,190$6.37M0.01%+72,02013F-HRTimelineGroup
FMR LLCin group FMR LLC100,842$5.99M<0.01%+93,39613F-HRTimelineGroup
Ghisallo Capital Management LLC100,000$5.94M0.19%-100,00013F-HRTimeline
Engineers Gate Manager LP97,495$5.79M0.07%new13F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.113,200$5.73M0.01%-38,07813F-HRTimelineGroup
Meridian Wealth Management, LLC91,102$5.41M0.21%new13F-HRTimeline
Andrew Hill Investment Advisors, Inc.88,855$5.28M4.11%-63,92413F-HRTimeline
Swiss National Bank84,600$5.02M<0.01%+1,30013F-HRTimeline
Informed Momentum Co LLC83,977$4.91M0.56%+8,68313F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.80,790$4.8M0.01%-2,29213F-HRTimelineGroup
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …79,079$4.7M0.01%+69,16613F-HRTimelineGroup
Stephens Investment Management Group LLCgroup of 2 filers holding76,411$4.54M+68,411Timeline
Lumbard & Kellner, LLC72,439$4.3M1.58%013F-HRTimeline
Verition Fund Management LLC71,186$4.23M0.02%+33,98613F-HRTimeline
RHUMBLINE ADVISERS70,425$4.18M<0.01%+9,26313F-HRTimeline
Cetera Investment Advisers70,366$4.18M<0.01%+64,32013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND68,700$4.08M0.01%-63613F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC66,325$3.94M0.02%+1,68213F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO66,198$3.93M<0.01%+24,12513F-HRTimelineGroup
CAPITAL FUND MANAGEMENT S.A.65,535$3.89M0.04%-46,81013F-HRTimeline
CAMPBELL NEWMAN ASSET MANAGEMENT INC65,365$3.88M0.28%+35413F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC64,601$3.84M0.08%-81,60813F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS63,009$3.74M<0.01%+55,20813F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC62,563$3.72M<0.01%-17,79813F-HR/ATimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC60,724$3.61M0.2%-34,00713F-HRTimeline
Legato Capital Management LLC58,848$3.49M0.38%-19,71413F-HRTimeline
Penserra Capital Management LLCin group Penserra Capital Management L…57,728$3.43M0.04%-10,58413F-HRTimelineGroup
Aquatic Capital Management LLC53,873$3.2M0.06%+20,84813F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…50,677$3.01M<0.01%-9213F-HRTimeline
Cubist Systematic Strategies, LLC49,508$2.94M0.04%+21,77813F-HRTimeline
LPL Financial LLC48,693$2.89M<0.01%+12,42313F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding47,351$2.81M+40,266Timeline
POLEN CAPITAL MANAGEMENT LLC47,291$2.81M0.01%+7013F-HRTimeline
GROUP ONE TRADING LLC46,903$2.79M0.08%+39,60413F-HRTimeline
Janney Montgomery Scott LLC45,731$2.72M0.01%-3013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA43,363$2.58M<0.01%+11,86213F-HRTimelineGroup
Amundiin group Amundi41,730$2.54M<0.01%-2,16513F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC41,389$2.46M<0.01%new13F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson39,350$2.34M<0.01%-7,41113F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.39,320$2.34M<0.01%+3,60013F-HRTimeline
Private Advisor Group, LLC37,683$2.24M0.01%new13F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\36,134$2.15M<0.01%+8,49013F-HRTimelineGroup
HWG Holdings LP35,468$2.11M0.53%new13F-HRTimeline
Cambridge Investment Research Advisors,…35,077$2.08M0.01%+12913F-HRTimeline
MACKENZIE FINANCIAL CORP34,289$2.04M<0.01%-15,48113F-HRTimeline
WOLVERINE TRADING, LLC33,287$2.03M0.04%new13F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.33,223$1.97M<0.01%-12,43613F-HRTimelineGroup
KORNITZER CAPITAL MANAGEMENT INC /KS33,000$1.96M0.04%-3,66013F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth32,919$1.95M<0.01%new13F-HRTimelineGroup
Merit Financial Group, LLC31,855$1.89M0.02%-18,04013F-HR/ATimeline
SG Americas Securities, LLC31,823$1.89M0.01%+24,23113F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…30,067$1.79M<0.01%+5,36713F-HRTimelineGroup
Quantum Private Wealth, LLC29,223$1.74M0.51%+1,80013F-HRTimeline
Quantbot Technologies LP26,831$1.59M0.04%+19,32913F-HRTimeline
VIRTUS ADVISERS, LLCin group Virtus Investment Advisers, L…25,990$1.54M0.85%+1,17513F-HR/ATimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC25,637$1.52M0.01%+94413F-HRTimeline
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP25,500$1.51M<0.01%+3,23013F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…25,405$1.51M0.01%new13F-HRTimelineGroup
IMC-Chicago, LLC25,044$1.49M0.03%+6,43513F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…24,264$1.44M<0.01%+3,61513F-HRTimeline
DARK FOREST CAPITAL MANAGEMENT LP23,858$1.42M0.05%-10,88913F-HR/ATimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …22,607$1.34M<0.01%+8,90213F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…22,393$1.33M<0.01%+14,65713F-HRTimelineGroup
Dorsey & Whitney Trust CO LLC21,611$1.28M0.07%013F-HRTimeline
CREDIT AGRICOLE S Ain group CREDIT AGRICOLE S A21,535$1.28M<0.01%13F-HRTimelineGroup
OPPENHEIMER & CO INCin group OPPENHEIMER ASSET MANAGEMENT …20,100$1.19M0.01%-23,49513F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC20,007$1.19M0.01%-6,35113F-HRTimeline
Hennion & Walsh Asset Management, Inc.19,711$1.17M0.04%+4,41513F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC19,021$1.13M<0.01%new13F-HRTimelineGroup
FOX RUN MANAGEMENT, L.L.C.18,861$1.12M0.17%-18,64413F-HRTimeline
COMERICA BANK18,808$1.12M<0.01%+13,14713F-HRTimeline
GoalVest Advisory LLC18,400$1.09M0.23%013F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…17,806$1.06M<0.01%+2,89013F-HRTimeline
TFC Financial Management, Inc.16,842$1M0.13%+11113F-HRTimeline
Advisory Services Network, LLC16,529$982K0.01%-25013F-HRTimeline
Traynor Capital Management, Inc.16,410$975K0.06%new13F-HRTimeline
STRS OHIO16,400$974K<0.01%-3,20013F-HRTimeline
Man Group plcin group Man Group plc16,114$957K<0.01%-2,78913F-HRTimelineGroup
Schonfeld Strategic Advisors LLC16,110$957K0.01%new13F-HRTimeline
GSA CAPITAL PARTNERS LLP15,798$938K0.08%+8,32513F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC14,821$880K<0.01%-674,87013F-HRTimelineGroup
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC14,229$845K<0.01%-5,82213F-HRTimelineGroup
COMMONWEALTH EQUITY SERVICES, LLC13,905$826K<0.01%+13113F-HRTimeline
Truvestments Capital LLC13,530$804K0.15%+64113F-HRTimeline
Neo Ivy Capital Management13,520$803K0.2%new13F-HRTimeline
Mariner, LLCin group Mariner, LLC13,227$786K<0.01%+93213F-HRTimelineGroup
TEACHER RETIREMENT SYSTEM OF TEXAS13,148$781K<0.01%+7,16313F-HRTimeline
IEQ CAPITAL, LLC12,889$765K<0.01%new13F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM12,883$765K<0.01%+44213F-HRTimeline
Police & Firemen's Retirement System of…12,067$717K0.01%+3,29013F-HRTimeline
Mitsubishi UFJ Asset Management Co., Lt…in group Mitsubishi UFJ Trust & Bankin…11,808$701K<0.01%-1,33113F-HRTimelineGroup
GPS Wealth Strategies Group, LLC11,437$679K0.07%+1,13513F-HRTimeline
CITIGROUP INCin group CITIGROUP INC11,094$659K<0.01%-15,61213F-HRTimelineGroup
OMERS ADMINISTRATION Corp10,700$635K<0.01%new13F-HRTimeline
Entropy Technologies, LP10,401$618K0.05%+1,50413F-HRTimeline
Sigma Planning Corp10,293$611K0.02%new13F-HRTimeline
Assenagon Asset Management S.A.10,031$596K<0.01%+3,80713F-HRTimeline
Kestra Advisory Services, LLCgroup of 2 filers holding9,913$589K-13,423Timeline
NewEdge Advisors, LLC9,641$573K<0.01%+9,10413F-HRTimeline
DIVERSIFIED TRUST CO9,500$564K0.01%+87613F-HRTimeline
ROI Financial Advisors, LLC9,419$559K0.33%+2,29813F-HRTimeline
KLP KAPITALFORVALTNING AS9,400$558K<0.01%013F-HRTimeline
Integrated Quantitative Investments LLC9,333$554K0.16%-2,45113F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC8,957$532K<0.01%-14,05313F-HRTimelineGroup
Ensign Peak Advisors, Inc8,850$526K<0.01%new13F-HR/ATimeline
ProShare Advisors LLC8,634$513K<0.01%-94113F-HRTimeline
CWM, LLCin group CWM, LLC8,472$503K<0.01%+1,32313F-HRTimelineGroup
Counterpoint Mutual Funds LLC8,206$487K0.04%-3,66713F-HRTimeline
NISSAY ASSET MANAGEMENT CORP /JAPAN8,065$479K<0.01%new13F-HRTimeline
AXQ CAPITAL, LP7,667$455K0.17%new13F-HRTimeline
Creative Planningin group Creative Planning7,044$418K<0.01%+1,36313F-HRTimelineGroup
Baader Bank Aktiengesellschaft7,063$418K0.03%new13F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
GREAT VALLEY ADVISOR GROUP, INC.in group GREAT VALLEY ADVISOR GROUP, I…6,741$400K0.01%-49413F-HRTimelineGroup
Scientech Research LLC6,585$391K0.14%new13F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD6,404$380K<0.01%new13F-HRTimeline
D.A. DAVIDSON & CO.6,277$373K<0.01%new13F-HRTimeline
BENJAMIN EDWARDS INCin group BENJAMIN EDWARDS INC6,219$369K<0.01%new13F-HRTimelineGroup
HRT FINANCIAL LP6,194$367K<0.01%-20,49413F-HRTimeline
Orion Porfolio Solutions, LLC6,132$364K<0.01%+2013F-HRTimeline
Cornerstone Investment Partners, LLC6,102$362K0.02%-56513F-HRTimeline
Prostatis Group LLC6,011$357K0.09%-1,26213F-HRTimeline
TOTH FINANCIAL ADVISORY CORP6,000$356K0.04%new13F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC5,962$354K<0.01%new13F-HRTimelineGroup
Savant Capital, LLCin group Savant Capital, LLC5,918$351K<0.01%+13013F-HR/ATimelineGroup
HighTower Advisors, LLC5,830$346K<0.01%-65713F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…5,829$346K<0.01%-1,91713F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP5,839$342K<0.01%+1,35313F-HRTimelineGroup
Mayflower Financial Advisors, LLC5,730$340K0.04%013F-HRTimeline
OXFORD ASSET MANAGEMENT LLP5,703$339K0.11%new13F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
Kingsview Wealth Management, LLC5,670$337K0.01%013F-HRTimeline
Quantinno Capital Management LP5,565$331K<0.01%new13F-HRTimeline
PROMETHIUM ADVISORS,LLC5,500$327K0.19%013F-HRTimeline
Cinctive Capital Management LP5,256$312K0.02%new13F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…5,484$310K<0.01%new13F-HRTimeline
Vontobel Holding Ltd.in group Vontobel Holding Ltd.5,021$298K<0.01%new13F-HRTimelineGroup
CIBC Bancorp USA Inc.group of 2 filers holding4,684$278K+4,659Timeline
CIM, LLC4,632$275K0.04%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…4,542$270K<0.01%+54213F-HRTimelineGroup
OCCUDO QUANTITATIVE STRATEGIES LP4,100$243K0.03%-6,84913F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC4,086$243K<0.01%-143,13813F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC3,906$232K<0.01%new13F-HRTimelineGroup
Aigen Investment Management, LP3,822$227K0.04%new13F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/3,797$226K<0.01%new13F-HRTimelineGroup
CAPTRUST FINANCIAL ADVISORS3,755$223K<0.01%new13F-HRTimeline
ANB BANK3,721$221K0.09%new13F-HRTimeline
Arax Advisory Partners3,672$218K<0.01%new13F-HRTimeline