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Disclosery

AMSC AMERICAN SUPERCONDUCTOR CORP

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SHS NEW (common), issuer CIK 880807

268 managers (277 13F filers) reported a position in AMSC shares at 2026-06-30, 35,358,688 shares in all. 62 filers opened a position and 30 filers sold out during the quarter.

Managers
268
13F filers
277
New
62
Added
107
Reduced
77
Sold out
30
Shares held by filers
35,358,688

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 2026

Filers in the available 13F reports with a share position at 2026-06-30, 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.4,095,371$170M<0.01%+112,72113F-HRTimelineGroup
VANGUARD GROUP INCgroup of 6 filers holding3,853,877$160M-282,584Timeline
BARROW HANLEY MEWHINNEY & STRAUSS LLC1,704,006$70.7M0.21%+564,21313F-HRTimeline
UBS Group AGgroup of 2 filers holding1,520,357$63.1M+832,150Timeline
EMERALD ADVISERS, LLCgroup of 2 filers holding1,382,911$57.4M+186,632Timeline
STATE STREET CORPin group STATE STREET CORP1,358,225$56.4M<0.01%+97,15413F-HR/ATimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,294,047$53.7M0.01%+584,54313F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC1,243,198$51.6M<0.01%+74,04613F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP1,168,424$48.5M0.03%+390,15613F-HRTimelineGroup
OBERWEIS ASSET MANAGEMENT INC/987,500$41M0.85%+137,60013F-HRTimeline
AWM Investment Company, Inc.951,604$39.5M3.43%+150,00013F-HRTimeline
BAILLIE GIFFORD & COin group BAILLIE GIFFORD & CO933,308$38.7M0.04%-514,11113F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc756,863$31.4M0.01%+226,73213F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP645,991$26.8M<0.01%-12,30613F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY635,833$26.4M<0.01%+1,99213F-HRTimelineGroup
Nuveen, LLCin group TIAA628,406$26.1M0.01%-392,54113F-HRTimelineGroup
Telemark Asset Management, LLC600,000$24.9M1.8%013F-HRTimeline
ROYCE & ASSOCIATES LP555,821$23.1M0.19%+13,04313F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP433,792$18M<0.01%+40,56813F-HRTimelineGroup
Stephens Investment Management Group LLCgroup of 2 filers holding408,212$16.9M+99,697Timeline
Ranger Investment Management, L.P.405,266$16.8M1.06%new13F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co399,125$16.6M<0.01%+13,71113F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC375,515$15.6M0.05%+119,12313F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.366,845$15.2M0.01%-200,72913F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS366,437$15.2M0.01%-70,25013F-HRTimelineGroup
ALGERT GLOBAL LLC353,832$14.7M0.17%-136,13913F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/343,867$14.3M<0.01%+285,25513F-HRTimeline
T. Rowe Price Investment Management, In…306,182$12.7M0.01%new13F-HRTimeline
HRT FINANCIAL LP298,420$12.4M0.02%new13F-HRTimeline
Qube Research & Technologies Ltd250,573$10.4M0.01%-78,84013F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…235,235$9.76M0.01%+173,42113F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …230,903$9.58M<0.01%-215,84913F-HRTimelineGroup
ESSEX INVESTMENT MANAGEMENT CO LLC221,933$9.21M1.21%-5,62513F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC194,477$8.07M<0.01%+9,72213F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.180,660$7.5M<0.01%-60,13213F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…171,764$7.13M0.01%+134,40013F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC170,319$7.07M<0.01%new13F-HRTimelineGroup
MACKENZIE FINANCIAL CORP164,450$6.83M0.01%+86,90813F-HRTimeline
ArrowMark Colorado Holdings LLC159,432$6.62M0.28%+24,00013F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.157,203$6.53M0.01%-6,05513F-HRTimelineGroup
Palisades Investment Partners, LLC156,720$6.51M1.85%+4,14413F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO149,502$6.04M<0.01%+12,65713F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp143,968$5.98M<0.01%+9,17813F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …130,622$5.21M0.01%-18,97913F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC118,801$4.93M<0.01%-5,15313F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC111,856$4.64M<0.01%+49,52013F-HRTimelineGroup
GMT Capital Corp108,066$4.49M0.23%013F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/106,216$4.41M<0.01%-103,23513F-HRTimelineGroup
Tidal Investments LLCin group Tidal Investments LLC101,341$4.21M0.01%+57,97213F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC100,762$4.18M<0.01%-81413F-HRTimelineGroup
SILVERCREST ASSET MANAGEMENT GROUP LLC100,026$4.15M0.03%new13F-HRTimeline
Holocene Advisors, LP95,716$3.97M0.01%+83,58813F-HRTimeline
Defiance ETFs, LLC99,395$3.97M0.06%+57,16813F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP90,340$3.75M<0.01%-78,67613F-HRTimelineGroup
Swiss National Bank88,600$3.68M<0.01%-50013F-HRTimeline
ALPS ADVISORS INCin group ALPS ADVISORS INC86,387$3.59M0.02%-17413F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…85,244$3.54M<0.01%new13F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO85,215$3.54M<0.01%-139,22113F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN83,306$3.46M<0.01%+25,14813F-HRTimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC78,620$3.26M0.16%+31,50613F-HRTimeline
Lumbard & Kellner, LLC74,139$3.08M0.93%+47013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND72,900$3.03M<0.01%+2,50013F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management68,847$2.86M0.01%-75,29713F-HRTimelineGroup
BROWN CAPITAL MANAGEMENT LLC68,156$2.83M0.57%new13F-HRTimeline
CAMPBELL NEWMAN ASSET MANAGEMENT INC67,337$2.8M0.21%+3,00013F-HRTimeline
RHUMBLINE ADVISERS63,572$2.64M<0.01%+3,88913F-HRTimeline
Amundiin group Amundi63,251$2.63M<0.01%+5,08213F-HRTimelineGroup
Cambridge Investment Research Advisors,…60,564$2.51M0.01%+12,01313F-HR/ATimeline
LPL Financial LLC57,385$2.38M<0.01%-29,93813F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP53,261$2.21M<0.01%new13F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\51,992$2.16M<0.01%+9,07413F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…50,888$2.11M<0.01%-6,12813F-HR/ATimeline
Hennion & Walsh Asset Management, Inc.46,020$1.91M0.05%+12,66513F-HRTimeline
ALLIANCEBERNSTEIN L.P.54,720$1.85M<0.01%+10,30013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…42,728$1.77M<0.01%+3,92613F-HRTimelineGroup
Legato Capital Management LLC41,369$1.72M0.14%+1,24813F-HRTimeline
Covestor Ltd41,348$1.72M0.99%+41,34413F-HRTimeline
NISSAY ASSET MANAGEMENT CORP /JAPAN37,914$1.57M0.01%+12,52713F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd37,682$1.56M0.01%-1,45813F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA35,656$1.48M<0.01%+4,32013F-HRTimelineGroup
Merit Financial Group, LLC35,471$1.47M0.01%-1,44713F-HR/ATimeline
Polymer Capital Management (US) LLC34,521$1.43M0.21%new13F-HRTimeline
Quantum Private Wealth, LLC33,823$1.4M0.36%+2,60013F-HRTimeline
Focus Partners Wealthin group Focus Partners Wealth33,671$1.4M<0.01%+41013F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources33,360$1.38M<0.01%+3,88213F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP32,700$1.36M<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC32,598$1.35M<0.01%+27,70913F-HRTimelineGroup
Mitsubishi UFJ Asset Management Co., Lt…in group Mitsubishi UFJ Trust & Bankin…32,145$1.33M<0.01%+19,24613F-HRTimelineGroup
Aquatic Capital Management LLC32,081$1.33M0.05%new13F-HRTimeline
KORNITZER CAPITAL MANAGEMENT INC /KS31,669$1.31M0.03%-3,30413F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd30,848$1.28M0.02%new13F-HRTimelineGroup
OPPENHEIMER & CO INCin group OPPENHEIMER ASSET MANAGEMENT …30,060$1.25M0.01%+4,77613F-HRTimelineGroup
Portolan Capital Management, LLCin group Portolan Capital Management, …29,314$1.22M0.05%-266,32213F-HRTimelineGroup
VIRTUS ADVISERS, LLCin group Virtus Investment Advisers, L…28,501$1.18M0.45%+1,04913F-HRTimelineGroup
HighTower Advisors, LLC28,498$1.18M<0.01%-14,76913F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…27,526$1.14M0.01%+1,83513F-HRTimelineGroup
Round Rock Advisors LLC26,431$1.1M0.14%+6,09113F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…24,343$1.01M<0.01%+2,09513F-HRTimeline
KBC Group NVin group KBC Group NV24,078$999K<0.01%+22,46513F-HRTimelineGroup
DIVERSIFIED TRUST CO23,878$991K0.02%+9,94213F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…21,666$899K<0.01%new13F-HRTimelineGroup
Dorsey & Whitney Trust CO LLC21,611$897K0.04%013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC20,528$852K<0.01%-196,18513F-HR/ATimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …20,426$848K<0.01%-40213F-HR/ATimelineGroup
Jupiter Topco LLCin group Janus Henderson20,134$836K<0.01%13F-HRTimelineGroup
ARDSLEY ADVISORY PARTNERS LP20,000$830K0.09%-5,00013F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …19,427$806K<0.01%+4,30513F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC18,751$778K<0.01%-6,39913F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC18,079$750K0.01%013F-HRTimeline
Quantinno Capital Management LP17,067$708K<0.01%+4,06513F-HRTimeline
TFC Financial Management, Inc.16,787$697K0.08%+4613F-HRTimeline
Truvestments Capital LLC16,567$688K0.1%-30513F-HRTimeline
SIMPLEX TRADING, LLC16,533$686K0.02%new13F-HRTimeline
Traynor Capital Management, Inc.16,489$684K0.03%+28013F-HRTimeline
Central Pacific Bank - Trust Division16,266$675K0.07%+7,09113F-HRTimeline
Verity Asset Management, Inc.16,246$674K0.26%-6,03413F-HRTimeline
SCHNIEDERS CAPITAL MANAGEMENT, LLC.16,054$666K0.09%new13F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC15,902$660K<0.01%+1,66013F-HRTimelineGroup
Advisory Services Network, LLC15,793$656K0.01%-88413F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC15,658$650K0.02%new13F-HRTimelineGroup
Andrew Hill Investment Advisors, Inc.15,496$643K0.48%new13F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC15,044$624K<0.01%+4,25113F-HRTimeline
GLOBEFLEX CAPITAL L P14,510$602K0.08%-7,12313F-HRTimeline
Inspire Advisors, LLCin group Inspire Investing, LLC14,450$599K0.04%new13F-HRTimelineGroup
Police & Firemen's Retirement System of…13,900$577K<0.01%+1,22613F-HRTimeline
GROUP ONE TRADING LLC13,622$565K0.02%+1,34413F-HRTimeline
CIM, LLC12,982$539K0.07%new13F-HRTimeline
ROI Financial Advisors, LLC12,842$533K0.28%+2,11113F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.12,651$525K<0.01%+2,06013F-HRTimelineGroup
Creative Planningin group Creative Planning12,169$505K<0.01%+2,95013F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM12,152$504K<0.01%-25913F-HRTimeline
IMC-Chicago, LLC12,020$499K<0.01%new13F-HRTimeline
nVerses Capital, LLC11,909$494K0.76%new13F-HRTimeline
Summit Financial, LLC11,622$482K0.01%+1,34513F-HRTimeline
DARK FOREST CAPITAL MANAGEMENT LP11,422$474K0.03%-8,85413F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.11,407$474K0.08%new13F-HRTimeline
F/m Investments LLC11,400$473K0.02%-5,69913F-HRTimeline
Retirement Planning Group, LLC11,000$457K0.01%new13F-HRTimeline
PFG Investments, LLC10,755$446K0.02%-5,07513F-HRTimeline
CREDIT AGRICOLE S Ain group CREDIT AGRICOLE S A10,745$446K<0.01%013F-HRTimelineGroup
Atom Investors LP10,696$444K0.04%new13F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…10,539$437K<0.01%-13,72513F-HRTimeline
FMR LLCin group FMR LLC10,354$430K<0.01%-136,93913F-HRTimelineGroup
Cetera Investment Advisers10,239$425K<0.01%+21613F-HRTimeline
State of Alaska, Department of Revenue10,146$421K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS10,100$419K<0.01%013F-HRTimeline
AVIVA PLCin group AVIVA PLC10,066$418K<0.01%-4,06813F-HRTimelineGroup
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP9,988$415K<0.01%new13F-HRTimelineGroup
TD Asset Management Inc9,978$414K<0.01%new13F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC9,698$403K<0.01%new13F-HRTimelineGroup
ProShare Advisors LLC9,680$402K<0.01%-1,27513F-HRTimeline
Catalyst Funds Management Pty Ltd9,000$374K0.02%new13F-HRTimeline
PRINCIPAL SECURITIES, INC.in group PRINCIPAL FINANCIAL GROUP INC8,975$373K<0.01%-1,39313F-HRTimelineGroup
MORGAN DEMPSEY CAPITAL MANAGEMENT LLC8,819$366K0.16%+30913F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding8,373$348K-2,977Timeline
ExodusPoint Capital Management, LP8,325$346K<0.01%-18,16513F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP8,637$343K<0.01%+1,47813F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC7,860$326K<0.01%+58013F-HRTimelineGroup
Fund Advisors of America Inc/FL7,809$324K0.29%-19013F-HRTimeline
Kings Path Partners LLC7,625$317K0.08%new13F-HRTimeline
Cornerstone Investment Partners, LLC7,560$314K0.01%-44213F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC7,471$310K<0.01%-10,04313F-HRTimelineGroup
WEALTH ENHANCEMENT ADVISORY SERVICES, L…8,610$310K<0.01%+2,20913F-HRTimeline
AXQ CAPITAL, LP7,449$309K0.03%+21813F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC7,414$308K0.01%new13F-HRTimeline
Dynamic Technology Lab Private Ltd7,163$298K0.07%new13F-HRTimeline
Kingsview Wealth Management, LLC6,995$290K<0.01%013F-HRTimeline
Marex Group Ltdin group Marex Group Ltd6,900$286K<0.01%new13F-HRTimelineGroup
GREAT VALLEY ADVISOR GROUP, INC.in group GREAT VALLEY ADVISOR GROUP, I…6,691$278K<0.01%-20013F-HRTimelineGroup
Wellington Shields Capital Management, …group of 2 filers holding6,632$275K0Timeline
TWO SIGMA SECURITIES, LLC6,551$272K0.02%new13F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…6,435$267K<0.01%-97813F-HRTimelineGroup
Yorktown Management & Research Co Inc6,400$266K0.16%new13F-HRTimeline
D.A. DAVIDSON & CO.6,347$263K<0.01%-44713F-HRTimeline
Orion Porfolio Solutions, LLC6,318$262K<0.01%-1313F-HRTimeline
EntryPoint Capital, LLC6,312$262K0.06%013F-HRTimeline
Assenagon Asset Management S.A.6,224$258K<0.01%-12,45513F-HR/ATimeline
Savant Capital, LLC6,044$251K<0.01%-2513F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD5,908$245K<0.01%new13F-HRTimeline
Mayflower Financial Advisors, LLC5,730$238K0.02%new13F-HRTimeline
ACORN FINANCIAL ADVISORY SERVICES INC /…5,623$233K0.03%-38113F-HRTimeline
Y-Intercept (Hong Kong) Ltd5,575$231K<0.01%new13F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV5,550$230K<0.01%new13F-HR/ATimeline
Granite Investment Partners, LLC5,420$225K0.01%new13F-HRTimeline
Corient Private Wealth LPin group Corient Private Wealth LP5,372$223K<0.01%new13F-HR/ATimelineGroup
VICTORY CAPITAL MANAGEMENT INC5,313$221K<0.01%-4,77513F-HRTimeline
PROMETHIUM ADVISORS,LLC5,000$208K0.1%new13F-HRTimeline
SEB Asset Management AB4,986$207K<0.01%new13F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…4,277$178K<0.01%+62513F-HRTimelineGroup
Arax Advisory Partners4,045$168K<0.01%+3,81313F-HRTimeline
STRS OHIO3,700$154K<0.01%-14,00013F-HRTimeline
State of Wyoming3,675$153K0.02%-94913F-HRTimeline
Ensign Peak Advisors, Inc3,050$127K<0.01%-1,50013F-HRTimeline
SBI Securities Co., Ltd.3,024$126K<0.01%+29313F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.2,753$114K<0.01%+87113F-HRTimelineGroup
Federation des caisses Desjardins du Qu…2,495$104K<0.01%-13013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…2,338$97K<0.01%-2,33713F-HRTimelineGroup
Lodestone Wealth Management LLC2,297$95.3K0.03%+1,24313F-HRTimeline
Freestone Grove Partners LP2,228$92.5K<0.01%new13F-HRTimeline
Global Retirement Partners, LLC1,919$79.7K<0.01%13F-HRTimeline