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Disclosery

AMSC AMERICAN SUPERCONDUCTOR CORP

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SHS NEW (common), issuer CIK 880807

236 managers (245 13F filers) reported a position in AMSC shares at 2026-03-31, 33,182,414 shares in all. 48 filers opened a position and 44 filers sold out during the quarter.

Managers
236
13F filers
245
New
48
Added
100
Reduced
62
Sold out
44
Shares held by filers
33,182,414

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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
VANGUARD GROUP INCgroup of 6 filers holding4,136,461$140MnewTimeline
BlackRock, Inc.in group BlackRock, Inc.3,982,650$135M<0.01%+232,24713F-HRTimelineGroup
BAILLIE GIFFORD & COin group BAILLIE GIFFORD & CO1,447,419$49M0.05%-59,42213F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,261,071$42.7M<0.01%+68,97813F-HRTimelineGroup
EMERALD ADVISERS, LLCgroup of 2 filers holding1,196,279$40.5M+3,465Timeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC1,169,152$39.6M<0.01%+78,44213F-HRTimelineGroup
BARROW HANLEY MEWHINNEY & STRAUSS LLC1,139,793$38.6M0.13%new13F-HRTimeline
Nuveen, LLCin group TIAA1,020,947$34.6M0.01%+59,97913F-HRTimelineGroup
OBERWEIS ASSET MANAGEMENT INC/849,900$28.8M0.85%+14,00013F-HRTimeline
AWM Investment Company, Inc.801,604$27.1M3%+47,38413F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP778,268$26.3M0.02%+95,30113F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC709,504$24M<0.01%-72,78313F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding688,207$23.3M-133,563Timeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP658,297$22.3M<0.01%+118,04413F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY633,841$21.5M<0.01%-71,60113F-HRTimelineGroup
Telemark Asset Management, LLC600,000$20.3M1.88%-19,90013F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.567,574$19.2M0.02%+124,42613F-HRTimelineGroup
ROYCE & ASSOCIATES LP542,778$18.4M0.18%+155,70913F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc530,131$17.9M<0.01%+252,10513F-HRTimelineGroup
ALGERT GLOBAL LLC489,971$16.6M0.25%+29,20013F-HR/ATimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …446,752$15.1M0.01%-236,45013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS436,687$14.8M0.01%+354,18513F-HRTimelineGroup
Hood River Capital Management LLC398,711$13.5M0.14%new13F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP393,224$13.3M<0.01%+32,41813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co385,414$13M<0.01%-2,09313F-HRTimelineGroup
NOMURA ASSET MANAGEMENT INTERNATIONAL I…in group NOMURA ASSET MANAGEMENT CO LTD379,483$12.8M0.02%-80,30313F-HRTimelineGroup
Qube Research & Technologies Ltd329,413$11.2M0.02%-269,59313F-HRTimeline
Stephens Investment Management Group LLCin group Stephens Investment Managemen…308,515$10.4M0.14%+134,28713F-HRTimelineGroup
Portolan Capital Management, LLCin group Portolan Capital Management, …295,636$10M0.53%new13F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC256,392$8.68M0.03%+1,60713F-HRTimeline
Invesco Ltd.in group Invesco Ltd.240,792$8.15M<0.01%-145,36013F-HRTimelineGroup
ESSEX INVESTMENT MANAGEMENT CO LLC227,558$7.7M1.22%+12,40413F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO224,436$7.6M0.01%+145,62613F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC216,713$7.34M0.01%-121,00013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/209,451$7.09M<0.01%+43,88313F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC184,755$6.25M<0.01%+38,79013F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP169,016$5.72M<0.01%-152,55513F-HRTimelineGroup
Baird Financial Group, Inc.in group Baird Financial Group, Inc.163,258$5.53M0.01%+28,35913F-HRTimelineGroup
Palisades Investment Partners, LLC152,576$5.16M2.02%+8,36713F-HRTimeline
FMR LLCin group FMR LLC147,293$4.99M<0.01%+22,88713F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …149,601$4.88M0.01%-55,07713F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management144,144$4.88M0.01%-8,65113F-HRTimelineGroup
ArrowMark Colorado Holdings LLC135,432$4.58M0.12%+25,00013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp134,790$4.56M<0.01%-2,25213F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO136,845$4.41M<0.01%+13,74213F-HR/ATimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC123,954$4.2M<0.01%-17,85713F-HRTimelineGroup
GMT Capital Corp108,066$3.66M0.17%new13F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC101,576$3.44M<0.01%+23,48813F-HRTimelineGroup
AXIOM INVESTORS LLC /DE100,814$3.41M0.04%-33,26213F-HRTimeline
Swiss National Bank89,100$3.02M<0.01%013F-HRTimeline
LPL Financial LLC87,323$2.96M<0.01%+47,24913F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC86,561$2.93M0.01%+24,31913F-HRTimelineGroup
MACKENZIE FINANCIAL CORP77,542$2.62M<0.01%+37,29713F-HRTimeline
Maxi Investments CY Ltd75,754$2.56M0.56%new13F-HRTimeline
Lumbard & Kellner, LLC73,669$2.49M0.86%+2,50813F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND70,400$2.38M<0.01%013F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC66,167$2.24M0.05%+1,54213F-HRTimeline
Boston Partnersin group Boston Trust Walden Corp66,071$2.24M<0.01%new13F-HRTimelineGroup
CAMPBELL NEWMAN ASSET MANAGEMENT INC64,337$2.18M0.18%+1,18913F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC62,336$2.11M<0.01%+3,38013F-HR/ATimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…61,814$2.09M<0.01%-3,81113F-HRTimelineGroup
RHUMBLINE ADVISERS59,683$2.02M<0.01%+1,99013F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/58,612$1.99M<0.01%-216,23213F-HRTimeline
Amundiin group Amundi58,169$1.97M<0.01%+11,85313F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN58,158$1.97M<0.01%-75,76013F-HR/ATimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…57,016$1.93M<0.01%+6,10513F-HRTimeline
Janney Montgomery Scott LLC56,946$1.93M<0.01%+10,56513F-HRTimeline
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC56,452$1.91M<0.01%new13F-HRTimelineGroup
Cambridge Investment Research Advisors,…48,551$1.64M<0.01%+8,95113F-HRTimeline
RICE HALL JAMES & ASSOCIATES, LLC47,114$1.59M0.09%013F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC43,512$1.47M0.01%+17,87513F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC43,369$1.47M<0.01%+19,18413F-HRTimelineGroup
HighTower Advisors, LLC43,267$1.46M<0.01%+32,78813F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\42,918$1.45M<0.01%+4,19513F-HRTimelineGroup
Defiance ETFs, LLC42,227$1.43M0.02%new13F-HRTimeline
Legato Capital Management LLC40,121$1.36M0.12%-56613F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd39,140$1.32M0.02%new13F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…38,802$1.31M<0.01%+5,98813F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.44,420$1.28M<0.01%+5,10013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…37,364$1.26M<0.01%+2,29913F-HRTimelineGroup
Merit Financial Group, LLC36,918$1.25M0.01%-36313F-HRTimeline
SG Americas Securities, LLC35,385$1.2M<0.01%-35,60713F-HRTimeline
KORNITZER CAPITAL MANAGEMENT INC /KS34,973$1.18M0.03%-1,18113F-HRTimeline
Hennion & Walsh Asset Management, Inc.33,355$1.13M0.04%+14,00013F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth33,261$1.13M<0.01%-1,04213F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP32,700$1.11M<0.01%013F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA31,336$1.06M<0.01%-13,79713F-HRTimelineGroup
Quantum Private Wealth, LLC31,223$1.06M0.33%+2,00013F-HRTimeline
JOURNEY STRATEGIC WEALTH LLC31,117$1.05M0.03%+4,72013F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources29,478$998K<0.01%-5,59413F-HRTimelineGroup
VIRTUS ADVISERS, LLCin group Virtus Investment Advisers, L…27,452$929K0.43%+1,46213F-HRTimelineGroup
ExodusPoint Capital Management, LP26,490$897K0.01%-44,26113F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…25,691$870K<0.01%+28613F-HRTimelineGroup
NISSAY ASSET MANAGEMENT CORP /JAPAN25,387$859K<0.01%+4,88513F-HRTimeline
OPPENHEIMER & CO INCin group OPPENHEIMER ASSET MANAGEMENT …25,284$856K0.01%new13F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC25,150$851K<0.01%+4,58713F-HRTimelineGroup
ARDSLEY ADVISORY PARTNERS LP25,000$846K0.13%new13F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…24,264$821K<0.01%013F-HRTimeline
Verity Asset Management, Inc.22,280$754K0.32%new13F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…22,248$753K<0.01%-11213F-HRTimeline
GLOBEFLEX CAPITAL L P21,633$732K0.11%013F-HRTimeline
Dorsey & Whitney Trust CO LLC21,611$732K0.04%013F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …20,828$705K<0.01%+40413F-HRTimelineGroup
Round Rock Advisors LLC20,340$689K0.11%+9,63113F-HRTimeline
DARK FOREST CAPITAL MANAGEMENT LP20,276$686K0.06%new13F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson20,134$681K<0.01%013F-HR/ATimelineGroup
VIRGINIA RETIREMENT SYSTEMS ET Al18,800$636K<0.01%+2,30013F-HRTimeline
Assenagon Asset Management S.A.18,679$632K<0.01%+9,79013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC18,079$612K0.01%-8,01713F-HRTimeline
STRS OHIO17,700$599K<0.01%-3,50013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC17,514$593K<0.01%-56,29113F-HRTimelineGroup
GoalVest Advisory LLC17,400$589K0.12%-50013F-HRTimeline
F/m Investments LLC17,099$579K0.04%+3,62913F-HRTimeline
Truvestments Capital LLC16,872$571K0.1%+1,42213F-HRTimeline
TFC Financial Management, Inc.16,741$567K0.07%013F-HRTimeline
Advisory Services Network, LLC16,677$565K0.01%+28113F-HRTimeline
PFG Investments, LLC15,830$536K0.02%new13F-HRTimeline
Traynor Capital Management, Inc.16,209$522K0.03%+5213F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD15,200$515K<0.01%-6,60013F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …15,122$512K<0.01%+94113F-HRTimelineGroup
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC14,242$482K<0.01%-12113F-HRTimelineGroup
AVIVA PLCin group AVIVA PLC14,134$478K<0.01%new13F-HRTimelineGroup
DIVERSIFIED TRUST CO13,936$472K0.01%+1,62513F-HRTimeline
Cinctive Capital Management LP13,833$468K0.03%new13F-HRTimeline
Quantinno Capital Management LP13,002$440K<0.01%+6013F-HRTimeline
Mitsubishi UFJ Asset Management Co., Lt…in group Mitsubishi UFJ Trust & Bankin…12,899$437K<0.01%-37813F-HRTimelineGroup
Integrated Quantitative Investments LLC12,868$436K0.08%new13F-HRTimeline
Police & Firemen's Retirement System of…12,674$429K<0.01%+1,23213F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM12,411$420K<0.01%-11313F-HRTimeline
GROUP ONE TRADING LLC12,278$416K0.01%+9,23713F-HRTimeline
Holocene Advisors, LP12,128$411K<0.01%new13F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding11,350$384K-53,170Timeline
WINTON GROUP Ltdin group WINTON GROUP Ltd11,266$381K0.01%+1,88113F-HRTimelineGroup
City Center Advisors, LLC11,118$376K0.35%+3,60113F-HRTimeline
ProShare Advisors LLC10,955$371K<0.01%-69913F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC10,793$365K<0.01%+69613F-HRTimeline
CREDIT AGRICOLE S Ain group CREDIT AGRICOLE S A10,745$364K<0.01%-10,30013F-HRTimelineGroup
ROI Financial Advisors, LLC10,731$363K0.22%+59813F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.10,591$358K<0.01%-61513F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding10,368$351K-57,218Timeline
Summit Financial, LLC10,277$348K<0.01%new13F-HRTimeline
State of Alaska, Department of Revenue10,146$343K<0.01%+4,00013F-HRTimeline
KLP KAPITALFORVALTNING AS10,100$342K<0.01%+70013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC10,088$341K<0.01%-66,79413F-HRTimeline
Cetera Investment Advisers10,023$339K<0.01%-1,40213F-HRTimeline
PDT Partners, LLC9,732$329K0.02%013F-HRTimeline
Creative Planningin group Creative Planning9,219$312K<0.01%new13F-HRTimelineGroup
Central Pacific Bank - Trust Division9,175$311K0.04%new13F-HRTimeline
CWM, LLCin group CWM, LLC8,823$299K<0.01%+1,07113F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\8,821$299K<0.01%+6113F-HRTimelineGroup
MANGROVE PARTNERS IM, LLC8,719$295K0.02%new13F-HRTimeline
Handelsbanken Fonder AB8,600$291K<0.01%013F-HRTimeline
MORGAN DEMPSEY CAPITAL MANAGEMENT LLC8,510$288K0.13%new13F-HRTimeline
Cornerstone Investment Partners, LLC8,002$271K0.01%new13F-HRTimeline
Fund Advisors of America Inc/FL7,999$271K0.27%-3,05413F-HRTimeline
Headlands Technologies LLC7,792$264K0.03%-26,51613F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…7,413$251K<0.01%new13F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC7,280$246K<0.01%new13F-HRTimelineGroup
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…7,242$245K<0.01%new13F-HRTimelineGroup
AXQ CAPITAL, LP7,231$245K0.03%-11,70013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP7,159$241K<0.01%-69213F-HRTimelineGroup
Kingsview Wealth Management, LLC6,995$237K<0.01%013F-HRTimeline
GREAT VALLEY ADVISOR GROUP, INC.in group GREAT VALLEY ADVISOR GROUP, I…6,891$233K<0.01%new13F-HRTimelineGroup
D.A. DAVIDSON & CO.6,794$230K<0.01%-21413F-HRTimeline
Wellington Shields Capital Management, …group of 2 filers holding6,632$224KnewTimeline
Cerity Partners LLCin group Cerity Partners LLC6,391$216K<0.01%new13F-HRTimelineGroup
Orion Porfolio Solutions, LLC6,331$214K<0.01%new13F-HRTimeline
EntryPoint Capital, LLC6,312$214K0.06%new13F-HRTimeline
Savant Capital, LLCin group Savant Capital, LLC6,069$205K<0.01%new13F-HRTimelineGroup
WEALTH ENHANCEMENT ADVISORY SERVICES, L…6,401$205K<0.01%new13F-HRTimeline
ACORN FINANCIAL ADVISORY SERVICES INC /…6,004$203K0.03%new13F-HRTimeline
CITIGROUP INCin group CITIGROUP INC4,889$165K<0.01%+3,29413F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…4,675$158K<0.01%+1,78413F-HRTimelineGroup
State of Wyoming4,624$157K0.02%+1,60313F-HRTimeline
Ensign Peak Advisors, Inc4,550$154K<0.01%013F-HR/ATimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…3,652$124K<0.01%013F-HRTimelineGroup
SBI Securities Co., Ltd.2,731$92.4K<0.01%+3813F-HRTimeline
Federation des caisses Desjardins du Qu…2,625$88.9K<0.01%013F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.1,882$63.7K<0.01%new13F-HR/ATimelineGroup
Kemnay Advisory Services Inc.1,867$63.2K0.01%new13F-HRTimeline
KBC Group NVin group KBC Group NV1,613$55K<0.01%013F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…1,573$53.2K<0.01%+1013F-HRTimelineGroup
Essential Partners LLC1,165$39.4K0.01%+1313F-HRTimeline
GAMMA Investing LLC1,128$38.2K<0.01%+4713F-HRTimeline
Lodestone Wealth Management LLC1,054$35.7K0.01%013F-HR/ATimeline
Allworth Financial LP1,044$35.3K<0.01%+32813F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …887$30K<0.01%+18713F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC811$27K<0.01%-13,25013F-HRTimelineGroup
Versant Capital Management, Inc665$22.5K<0.01%-8113F-HRTimeline
NewEdge Advisors, LLC633$21.4K<0.01%-13813F-HR/ATimeline
NISA INVESTMENT ADVISORS, LLC545$18.4K<0.01%+1613F-HRTimeline
SWAN Capital LLC500$16.9K0.01%+10013F-HRTimeline
Wealth Enhancement Trust Services, Inc.399$13.5K<0.01%new13F-HRTimeline
Clearstead Trust, LLC393$13.3K<0.01%013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…341$11.5K<0.01%-3,91913F-HRTimelineGroup
Arax Advisory Partners232$11.5K<0.01%+22513F-HRTimeline
MAI Capital Management339$11.5K<0.01%+24913F-HRTimeline
Sterling Capital Management LLC299$10.1K<0.01%+913F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/294$9.94K<0.01%+17413F-HRTimelineGroup
SHP Wealth Management271$9.17K<0.01%013F-HRTimeline