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Disclosery

AMSC AMERICAN SUPERCONDUCTOR CORP

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SHS NEW (common), issuer CIK 880807

230 managers (233 13F filers) reported a position in AMSC shares at 2025-06-30, 32,715,652 shares in all. 68 filers opened a position and 26 filers sold out during the quarter.

Managers
230
13F filers
233
New
68
Added
95
Reduced
47
Sold out
26
Shares held by filers
32,715,652

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, Q2 2025

Filers in the available 13F reports with a share position at 2025-06-30, 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.3,420,039$125M<0.01%+161,61613F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC2,447,047$89.8M<0.01%+159,46213F-HRTimelineGroup
AWM Investment Company, Inc.1,558,478$57.2M6.41%013F-HRTimeline
BAILLIE GIFFORD & COin group BAILLIE GIFFORD & CO1,452,679$53.3M0.04%-66,21113F-HRTimelineGroup
Hood River Capital Management LLC1,168,906$42.9M0.6%-70,19013F-HRTimeline
Atreides Management, LP1,104,458$40.5M1.12%+280,41813F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,029,047$37.8M0.01%+547,08613F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,020,165$37.4M<0.01%+130,11813F-HRTimelineGroup
Nuveen, LLCin group TIAA997,902$36.6M0.01%+219,33613F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC940,111$34.5M<0.01%+58,43013F-HRTimelineGroup
Driehaus Capital Management LLC839,847$30.8M0.25%+413F-HRTimeline
MACQUARIE GROUP LTDin group MACQUARIE GROUP LTD822,179$30.2M0.04%-204,64313F-HRTimelineGroup
ROYCE & ASSOCIATES LP811,732$29.8M0.31%-55,61013F-HRTimeline
EMERALD ADVISERS, LLCgroup of 2 filers holding713,968$26.2M+662,652Timeline
Telemark Asset Management, LLC690,000$25.3M2.69%+90,00013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC689,691$25.3M0.02%+558,13013F-HRTimelineGroup
OBERWEIS ASSET MANAGEMENT INC/668,200$24.5M1.07%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY570,356$20.9M<0.01%+60,45913F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP480,753$17.6M<0.01%-187,39913F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…431,589$15.8M<0.01%+142,41613F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc417,039$15.3M<0.01%+52,50913F-HRTimelineGroup
ESSEX INVESTMENT MANAGEMENT CO LLC346,042$12.7M2.31%-26,17913F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP341,549$12.5M<0.01%+11,03613F-HRTimelineGroup
HEIGHTS CAPITAL MANAGEMENT, INCin group HEIGHTS CAPITAL MANAGEMENT, I…340,102$12.5M3.9%new13F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP337,574$12.4M0.01%+7,02213F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding332,635$12.2M+85,861Timeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co322,958$11.8M<0.01%+13,27713F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …273,396$9.84M0.02%-67,63413F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL260,121$9.54M0.07%+240,00713F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC251,807$9.24M0.01%+26,12513F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …236,396$8.67M0.01%new13F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN220,796$8.1M<0.01%+173,85413F-HRTimelineGroup
Hillsdale Investment Management Inc.220,000$8.07M0.3%+29,60013F-HRTimeline
ALGERT GLOBAL LLC205,705$7.55M0.16%+110,04713F-HR/ATimeline
Ghisallo Capital Management LLC200,000$7.34M0.2%new13F-HRTimeline
Lisanti Capital Growth, LLC180,750$6.63M1.84%new13F-HRTimeline
PANAGORA ASSET MANAGEMENT INC171,988$6.31M0.03%+26,67413F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/169,141$6.21M<0.01%+116,20713F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC168,890$6.2M0.01%-42,27413F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC166,914$6.12M<0.01%+9,02513F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC164,105$6.02M0.01%+42,56613F-HRTimelineGroup
Trexquant Investment LP159,483$5.85M0.07%-82,88613F-HRTimeline
Invesco Ltd.in group Invesco Ltd.159,292$5.84M<0.01%-84,23113F-HRTimelineGroup
ArrowMark Colorado Holdings LLC156,432$5.74M0.1%+26,00013F-HRTimeline
Andrew Hill Investment Advisors, Inc.152,779$5.61M4.51%+79,88813F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.151,278$5.55M0.01%+43,87213F-HR/ATimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC147,224$5.4M0.01%+101,74613F-HR/ATimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC146,209$5.36M0.13%+127,00513F-HRTimeline
Palisades Investment Partners, LLC140,498$5.15M2.25%-4,10613F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.133,644$4.9M<0.01%+58,65313F-HRTimelineGroup
Qube Research & Technologies Ltd130,120$4.77M0.01%-279,28713F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC128,635$4.72M0.06%new13F-HR/ATimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP122,850$4.51M0.01%+79,49313F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp120,854$4.43M<0.01%+12,90813F-HRTimelineGroup
CAPITAL FUND MANAGEMENT S.A.112,345$4.12M0.05%-35,12813F-HRTimeline
CASTLEARK MANAGEMENT LLC109,170$4.01M0.12%new13F-HRTimeline
GMT Capital Corp108,066$3.96M0.17%013F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…95,265$3.5M0.01%+44,43813F-HRTimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC94,731$3.48M0.19%+11,98213F-HRTimeline
Swiss National Bank83,300$3.06M<0.01%+10,70013F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.83,082$3.05M0.01%-2,68413F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC80,361$2.95M<0.01%+32,36813F-HR/ATimelineGroup
Legato Capital Management LLC78,562$2.88M0.34%+34,19913F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management75,303$2.76M0.01%+53,09813F-HRTimelineGroup
Informed Momentum Co LLC75,294$2.76M0.42%new13F-HRTimeline
ExodusPoint Capital Management, LP74,362$2.73M0.03%+38,09713F-HRTimeline
Lumbard & Kellner, LLC72,439$2.66M1.16%new13F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND69,336$2.54M<0.01%+2,80013F-HR/ATimeline
Penserra Capital Management LLCin group Penserra Capital Management L…68,312$2.51M0.03%new13F-HRTimelineGroup
CAMPBELL NEWMAN ASSET MANAGEMENT INC65,011$2.39M0.19%+4,38513F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC64,643$2.37M0.01%+5,17913F-HRTimelineGroup
RHUMBLINE ADVISERS61,162$2.24M<0.01%+11,98913F-HRTimeline
Centiva Capital, LP56,940$2.09M0.14%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO55,637$2.04M<0.01%-2,81013F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…50,769$1.86M<0.01%+15,21013F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources50,515$1.85M<0.01%+6,41313F-HRTimelineGroup
Merit Financial Group, LLC49,895$1.83M0.02%-1,85613F-HRTimeline
MACKENZIE FINANCIAL CORP49,770$1.83M<0.01%new13F-HRTimeline
BANTAMAC CAPITAL, LLC47,221$1.73M0.62%+4,71113F-HRTimeline
POLEN CAPITAL MANAGEMENT LLC47,221$1.73M0.01%new13F-HRTimeline
Amundiin group Amundi43,895$1.72M<0.01%-5,86913F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson46,761$1.72M<0.01%+30,96113F-HRTimelineGroup
Janney Montgomery Scott LLC45,761$1.68M<0.01%new13F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.45,659$1.68M<0.01%+3,21813F-HRTimelineGroup
OPPENHEIMER & CO INCin group OPPENHEIMER ASSET MANAGEMENT …43,595$1.6M0.02%+33,59513F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd42,213$1.55M0.06%+25,94413F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO42,073$1.54M<0.01%+12,21713F-HRTimelineGroup
FOX RUN MANAGEMENT, L.L.C.37,505$1.38M0.23%+8,78613F-HRTimeline
Verition Fund Management LLC37,200$1.36M0.01%-7,10413F-HRTimeline
KORNITZER CAPITAL MANAGEMENT INC /KS36,660$1.35M0.03%new13F-HRTimeline
LPL Financial LLC36,270$1.33M<0.01%+2,49513F-HRTimeline
ALLIANCEBERNSTEIN L.P.35,720$1.31M<0.01%013F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC35,170$1.29M<0.01%new13F-HRTimelineGroup
Cambridge Investment Research Advisors,…34,948$1.28M<0.01%-2,77513F-HRTimeline
DARK FOREST CAPITAL MANAGEMENT LP34,747$1.27M0.05%-31,77613F-HRTimeline
Aquatic Capital Management LLC33,025$1.21M0.02%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA31,501$1.16M<0.01%+5,31113F-HR/ATimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/27,853$1.02M<0.01%+3,57613F-HRTimeline
Cubist Systematic Strategies, LLC27,730$1.02M0.01%-81,55513F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\27,644$1.01M<0.01%-2,19113F-HRTimelineGroup
Quantum Private Wealth, LLC27,423$1.01M0.33%013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC26,706$980K<0.01%-49413F-HRTimelineGroup
HRT FINANCIAL LP26,688$979K<0.01%-2,99013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC26,358$967K0.01%+7,50913F-HRTimeline
Advisory Services Network, LLC16,779$954K0.02%+2,76213F-HRTimeline
VIRTUS ADVISERS, LLCin group Virtus Investment Advisers, L…24,815$910K0.56%new13F-HR/ATimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…24,700$906K<0.01%-59513F-HRTimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC24,693$906K<0.01%+6313F-HRTimeline
Kestra Advisory Services, LLCgroup of 2 filers holding23,336$856K+2,202Timeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC23,010$845K<0.01%-2,42013F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP22,270$817K<0.01%+12,03513F-HRTimelineGroup
Dorsey & Whitney Trust CO LLC21,611$793K0.04%-23,68913F-HRTimeline
NKCFO LLC21,000$770K0.32%new13F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…20,649$758K<0.01%013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC20,051$736K<0.01%+85213F-HRTimelineGroup
COOKSON PEIRCE & CO INC20,000$734K0.03%new13F-HRTimeline
FNY Investment Advisers, LLC20,000$733K0.31%new13F-HRTimeline
STRS OHIO19,600$719K<0.01%-1,30013F-HRTimeline
Shay Capital LLC19,500$715K0.16%new13F-HRTimeline
Man Group plcin group Man Group plc18,903$694K<0.01%+6,48513F-HRTimelineGroup
Aster Capital Management (DIFC) Ltd18,809$690K0.16%new13F-HRTimeline
IMC-Chicago, LLC18,609$683K0.02%new13F-HRTimeline
GoalVest Advisory LLC18,400$675K0.17%-50013F-HRTimeline
TFC Financial Management, Inc.16,731$614K0.08%013F-HRTimeline
Sowell Financial Services LLC15,451$567K0.02%-1,00813F-HRTimeline
Hennion & Walsh Asset Management, Inc.15,296$561K0.02%new13F-HRTimeline
ACAS, LLC10,200$552K0.37%+3513F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…14,916$547K<0.01%013F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC13,774$505K<0.01%new13F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …13,705$503K<0.01%+1,25913F-HRTimelineGroup
Bridgefront Capital, LLC13,273$487K0.13%new13F-HRTimeline
Mitsubishi UFJ Asset Management Co., Lt…in group Mitsubishi UFJ Trust & Bankin…13,139$482K<0.01%+3,84513F-HRTimelineGroup
Bayesian Capital Management, LP13,000$477K0.08%new13F-HRTimeline
Truvestments Capital LLC12,889$473K0.09%+1,71313F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM12,441$456K<0.01%+1,70813F-HRTimeline
Mariner, LLCin group Mariner, LLC12,295$451K<0.01%new13F-HRTimelineGroup
Counterpoint Mutual Funds LLC11,873$436K0.04%new13F-HRTimeline
Integrated Quantitative Investments LLC11,784$432K0.13%-6,31613F-HRTimeline
Capital Market Strategies LLC11,688$429K0.3%-1,50013F-HRTimeline
OCCUDO QUANTITATIVE STRATEGIES LP10,949$402K0.05%new13F-HRTimeline
GPS Wealth Strategies Group, LLC10,302$378K0.04%+85013F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …9,913$364K<0.01%new13F-HRTimelineGroup
ProShare Advisors LLC9,575$351K<0.01%new13F-HRTimeline
KLP KAPITALFORVALTNING AS9,400$345K<0.01%+2,50013F-HRTimeline
SIMPLEX TRADING, LLC9,197$337K0.01%-4,31113F-HRTimeline
Entropy Technologies, LP8,897$326K0.03%new13F-HRTimeline
Police & Firemen's Retirement System of…8,777$322K<0.01%+82713F-HRTimeline
DIVERSIFIED TRUST CO8,624$316K0.01%new13F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd8,533$313K0.01%new13F-HRTimelineGroup
STEPHENS INC /AR/in group Stephens Investment Managemen…8,000$294K<0.01%new13F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS7,801$286K<0.01%+1,97113F-HRTimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…7,746$284K<0.01%new13F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…7,736$284K<0.01%+7,57713F-HRTimelineGroup
TWO SIGMA SECURITIES, LLC7,642$280K0.03%-2,85813F-HRTimeline
SG Americas Securities, LLC7,592$279K<0.01%-8,24713F-HRTimeline
Quantbot Technologies LP7,502$275K0.01%new13F-HRTimeline
GSA CAPITAL PARTNERS LLP7,473$274K0.02%-23,53313F-HRTimeline
FMR LLCin group FMR LLC7,446$273K<0.01%+4,65313F-HRTimelineGroup
GROUP ONE TRADING LLC7,299$268K0.01%new13F-HRTimeline
Prostatis Group LLC7,273$267K0.08%new13F-HRTimeline
GREAT VALLEY ADVISOR GROUP, INC.in group GREAT VALLEY ADVISOR GROUP, I…7,235$265K0.01%new13F-HRTimelineGroup
CWM, LLCin group CWM, LLC7,149$262K<0.01%-76613F-HRTimelineGroup
ROI Financial Advisors, LLC7,121$261K0.17%new13F-HRTimeline
PRINCIPAL SECURITIES, INC.in group PRINCIPAL FINANCIAL GROUP INC7,085$260K<0.01%+6,56013F-HRTimelineGroup
C2P Capital Advisory Group, LLC d.b.a. …6,879$252K0.02%new13F-HR/ATimeline
Cornerstone Investment Partners, LLC6,667$245K0.01%new13F-HRTimeline
HighTower Advisors, LLC6,487$238K<0.01%new13F-HRTimeline
Assenagon Asset Management S.A.6,224$228K<0.01%new13F-HRTimeline
Orion Porfolio Solutions, LLC6,112$224K<0.01%new13F-HR/ATimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC6,093$223K<0.01%new13F-HRTimelineGroup
Cetera Investment Advisers6,046$222K<0.01%new13F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS5,985$220K<0.01%new13F-HRTimeline
Garden State Investment Advisory Servic…5,897$216K0.06%new13F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC5,788$212K<0.01%new13F-HR/ATimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…5,762$211K0.01%+4,33713F-HRTimelineGroup
Mayflower Financial Advisors, LLC5,730$210K0.03%new13F-HRTimeline
Creative Planningin group Creative Planning5,681$208K<0.01%new13F-HRTimelineGroup
Kingsview Wealth Management, LLC5,670$208K<0.01%new13F-HRTimeline
COMERICA BANK5,661$208K<0.01%+5,40613F-HRTimeline
PROMETHIUM ADVISORS,LLC5,500$202K0.12%new13F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP4,486$163K<0.01%-21513F-HRTimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…4,000$147K<0.01%+3,97613F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…3,900$143K<0.01%+55513F-HRTimelineGroup
SBI Securities Co., Ltd.3,867$142K<0.01%+1,52713F-HRTimeline
Steward Partners Investment Advisory, L…2,625$96.3K<0.01%new13F-HRTimeline
Global Retirement Partners, LLC2,416$88.6K<0.01%13F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD2,000$73.4K<0.01%+1,00013F-HRTimeline
Banque Cantonale Vaudoisein group Banque Cantonale Vaudoise1,585$58K<0.01%new13F-HRTimelineGroup
AMALGAMATED BANK1,185$43K<0.01%013F-HRTimeline
Essential Partners LLC1,152$42.3K0.02%13F-HRTimeline
Quarry LP1,131$41.5K0.01%+6513F-HRTimeline
Point72 (DIFC) Ltd1,115$40.9K<0.01%-4,88313F-HRTimeline
GAMMA Investing LLC954$35K<0.01%+48813F-HRTimeline
SIGNATUREFD, LLC913$33.5K<0.01%+16313F-HRTimeline
Allworth Financial LP685$25.1K<0.01%+4613F-HRTimeline
Versant Capital Management, Inc628$23K<0.01%+1913F-HRTimeline
NewEdge Advisors, LLC537$19.7K<0.01%-18,29613F-HRTimeline
Farther Finance Advisors, LLC530$19.4K<0.01%+50013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC529$19.4K<0.01%-1113F-HRTimeline
Park Square Financial Group, LLC493$18.1K0.01%013F-HRTimeline