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MKTX MARKETAXESS HLDGS INC

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COM (common), issuer CIK 1278021

385 managers (396 13F filers) reported a position in MKTX shares at 2026-06-30, 39,092,774 shares in all. 53 filers opened a position and 106 filers sold out during the quarter.

Managers
385
13F filers
396
New
53
Added
129
Reduced
170
Sold out
106
Shares held by filers
39,092,774

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.3,999,836$454M0.01%-75,31813F-HRTimelineGroup
VANGUARD GROUP INCgroup of 7 filers holding3,930,844$446M-132,932Timeline
PRIMECAP MANAGEMENT CO/CA/3,504,905$398M0.24%+157,78013F-HRTimeline
North Reef Capital Management LP3,395,000$385M14.77%+1,520,00013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC1,987,288$223M0.08%-696,45713F-HRTimelineGroup
FMR LLCin group FMR LLC1,404,998$159M0.01%-114,42313F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,281,769$145M<0.01%+91213F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC1,229,929$140M0.09%+263,90013F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,031,309$117M0.01%+522,26613F-HRTimelineGroup
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/1,017,024$115M0.04%-3,53513F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC994,772$113M0.01%+131,78513F-HRTimelineGroup
VAN ECK ASSOCIATES CORPin group VAN ECK ASSOCIATES CORP924,617$105M0.06%-314,66813F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP597,894$67.8M0.01%+16,41013F-HRTimelineGroup
NORGES BANK572,422$65M0.01%new13F-HRTimeline
GUARDCAP ASSET MANAGEMENT Ltd536,324$62.2M4.42%-107,04613F-HR/ATimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP543,890$61.7M0.05%+19,86613F-HRTimelineGroup
Azora Capital LP513,081$58.2M2.45%new13F-HRTimeline
Davis Asset Management, L.P.500,000$56.7M1.44%+391,15413F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC481,689$54.7M0.03%+399,53013F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO438,001$48.3M<0.01%+5,17513F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY422,864$48M<0.01%-67,67313F-HRTimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC392,065$44.5M0.16%+382,48413F-HRTimeline
UBS Group AGgroup of 2 filers holding383,598$43.5M+4,250Timeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co330,815$37.5M<0.01%-7,69213F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/303,517$34.4M<0.01%+39,65913F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp257,642$29.2M<0.01%-32,29813F-HRTimelineGroup
RDST Capital LLC247,112$28M2.32%-48,15513F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP246,521$28M<0.01%+10,17113F-HRTimelineGroup
COOKE & BIELER LP238,755$27.1M0.31%+12,53513F-HRTimeline
HRT FINANCIAL LP205,854$23.4M0.04%+68,90213F-HRTimeline
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …204,309$23.2M0.02%+88413F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC202,731$23M0.01%-2,20113F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC200,000$22.7M0.03%+32,90013F-HRTimeline
Connor, Clark & Lunn Investment Managem…186,658$21.2M0.04%+12,59913F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC173,312$19.7M0.01%-8,48613F-HRTimelineGroup
Freestone Grove Partners LP172,799$19.6M0.13%new13F-HRTimeline
Public Sector Pension Investment Board157,338$17.9M0.05%-34,89213F-HR/ATimeline
Sone Capital Management, LLC155,522$17.7M1.34%-4,44413F-HRTimeline
Nuveen, LLCin group TIAA148,468$16.8M<0.01%+38713F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.140,817$16M<0.01%+22,48513F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL137,847$15.6M0.06%new13F-HRTimeline
Champlain Investment Partners, LLC136,087$15.4M0.4%-73,98913F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …122,005$13.8M0.01%-173,46513F-HRTimelineGroup
M&G PLCin group M&G PLC121,309$13.7M0.07%new13F-HRTimelineGroup
BANK OF NOVA SCOTIAin group BANK OF NOVA SCOTIA115,410$13.1M0.02%+90,79813F-HRTimelineGroup
CIBC Bancorp USA Inc.in group CIBC Bancorp USA Inc.114,968$13M0.02%+111,65813F-HRTimelineGroup
EUBEL BRADY & SUTTMAN ASSET MANAGEMENT …114,292$13M1.54%+2,80913F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC114,278$13M<0.01%-7,35713F-HRTimelineGroup
ALGERT GLOBAL LLC112,400$12.8M0.15%+92,96013F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC109,590$12.4M0.01%-977,59813F-HRTimelineGroup
HEARTLAND ADVISORS INC104,926$11.9M0.53%+46,59213F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding96,149$10.9M-255,644Timeline
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…92,100$10.5M0.01%-53,52813F-HRTimeline
Invenomic Capital Management LP90,441$10.3M0.61%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc84,460$9.59M<0.01%-6,26013F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC79,372$9.01M<0.01%+9,48713F-HRTimelineGroup
Jump Financial, LLCin group Jump Financial, LLC78,566$8.92M0.08%+66,01013F-HRTimelineGroup
CIBC WORLD MARKET INC.78,286$8.88M0.01%+74,29413F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC77,353$8.78M0.01%+64,61313F-HRTimelineGroup
FLOSSBACH VON STORCH SE75,000$8.51M0.04%-33,10013F-HRTimeline
RHUMBLINE ADVISERS72,725$8.25M0.01%-17,23613F-HRTimeline
Swiss National Bank71,400$8.1M<0.01%-2,30013F-HRTimeline
Trexquant Investment LP66,681$7.57M0.05%-3,69713F-HRTimeline
CITIGROUP INCin group CITIGROUP INC64,762$7.35M<0.01%+43,37213F-HRTimelineGroup
Alpha Omega Wealth Management LLC61,453$6.97M1.06%+50,55813F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP56,622$6.43M0.01%+20,92513F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO56,022$6.36M0.01%+25,79113F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd54,792$6.22M0.12%+51,73813F-HRTimeline
VAN DEN BERG MANAGEMENT I, INC52,054$5.91M1.25%+20,63113F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…51,050$5.79M0.08%new13F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD51,004$5.79M0.01%+15,53213F-HRTimeline
California Public Employees Retirement …49,950$5.67M<0.01%-22,57213F-HRTimeline
First Eagle Investment Management, LLCin group First Eagle Investment Manage…49,577$5.63M0.01%+49,55513F-HR/ATimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.47,977$5.44M<0.01%+44,66313F-HRTimelineGroup
Quantinno Capital Management LP47,575$5.4M0.01%+58513F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP46,658$5.3M<0.01%+7,16613F-HRTimelineGroup
WILSON ASSET MANAGEMENT (INTERNATIONAL)…45,042$5.11M1.4%+5,58113F-HRTimeline
Mariner, LLCin group Mariner, LLC44,790$5.08M0.01%-34,35413F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC44,382$5.04M0.01%-39,61913F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC44,363$5.03M<0.01%+28,17113F-HRTimelineGroup
T. Rowe Price Investment Management, In…43,842$4.98M<0.01%-43613F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…42,443$4.82M<0.01%-1,24513F-HR/ATimeline
DF DENT & CO INC39,303$4.46M0.08%-1,69713F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA39,121$4.44M<0.01%+8,19813F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP39,090$4.44M<0.01%new13F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/38,521$4.37M<0.01%+1,60113F-HRTimeline
Holocene Advisors, LP38,269$4.34M0.01%-5,53013F-HRTimeline
Prana Capital Management, LP37,877$4.3M0.13%+6,28413F-HRTimeline
Corebridge Financial, Inc.in group Corebridge Financial, Inc.38,650$4.25M100%new13F-HRTimelineGroup
FJ Capital Management LLC37,237$4.23M0.55%new13F-HRTimeline
Taylor Hoffman Capital Management LLC35,895$4.07M0.99%+7,03213F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS35,288$4M<0.01%-284,01413F-HRTimelineGroup
STATE BOARD OF ADMINISTRATION OF FLORID…34,407$3.9M0.01%-63013F-HRTimeline
READYSTATE ASSET MANAGEMENT LP33,794$3.84M0.16%+8,85913F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC33,576$3.81M<0.01%+12,56713F-HRTimelineGroup
GW&K Investment Management, LLC32,689$3.71M0.03%-813F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…32,579$3.7M<0.01%new13F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC32,462$3.68M0.01%+16,60413F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC32,341$3.67M<0.01%-1,40313F-HRTimelineGroup
Elo Mutual Pension Insurance Co31,860$3.62M0.05%+17,17413F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources31,838$3.61M<0.01%+14,23513F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd31,823$3.61M0.05%+21,99513F-HRTimelineGroup
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co31,755$3.6M0.01%-2,15413F-HRTimelineGroup
Bahl & Gaynor LLC31,678$3.6M0.02%-94813F-HRTimeline
Fideuram Asset Management (Ireland) dac25,503$3.52M0.07%new13F-HRTimeline
ALPS ADVISORS INC29,762$3.38M0.02%+86713F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…29,667$3.37M0.01%-1,47413F-HRTimelineGroup
Amundiin group Amundi29,411$3.34M<0.01%-229,29713F-HRTimelineGroup
Robertson Opportunity Capital, LLC28,830$3.27M1.27%013F-HRTimeline
PDT Partners, LLC28,171$3.2M0.17%+23,89113F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…27,338$3.11M0.01%-28,83413F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…27,287$3.1M0.01%-4,29713F-HRTimeline
GENEVA CAPITAL MANAGEMENT LLC27,092$3.07M0.07%-44113F-HRTimeline
Greenwich Wealth Management LLC26,934$3.06M0.11%new13F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd25,185$2.86M0.02%new13F-HRTimelineGroup
SummitTX Capital, L.P.24,362$2.76M0.07%new13F-HRTimeline
Caisse de depot et placement du Quebec23,004$2.61M<0.01%-15,88313F-HRTimeline
Hunter Perkins Capital Management, LLC22,906$2.6M0.58%+2,91413F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV22,443$2.55M<0.01%-9,51413F-HR/ATimeline
Illinois Municipal Retirement Fund21,988$2.5M0.03%+1,67513F-HRTimeline
AGF MANAGEMENT LTDin group AGF MANAGEMENT LTD21,692$2.46M0.01%+1,73713F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC21,499$2.44M<0.01%+7,65213F-HRTimelineGroup
Creative Planningin group Creative Planning20,448$2.32M<0.01%-2,62613F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND19,865$2.25M<0.01%-31413F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC19,749$2.24M0.01%+5,10713F-HRTimelineGroup
State of Tennessee, Department of Treas…18,534$2.1M0.01%+1,85213F-HRTimeline
ALLIANCEBERNSTEIN L.P.12,715$2.1M<0.01%-28,54413F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC17,419$1.98M0.02%new13F-HRTimeline
CenterBook Partners LP17,296$1.96M0.1%+59013F-HRTimeline
Jupiter Topco LLCin group Janus Henderson16,600$1.88M<0.01%13F-HRTimelineGroup
GUARDIAN CAPITAL LPgroup of 2 filers holding16,400$1.86M-3,301Timeline
IEQ CAPITAL, LLC16,146$1.83M0.01%-157,74513F-HRTimeline
Police & Firemen's Retirement System of…15,889$1.8M0.01%+4413F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…15,734$1.79M<0.01%-3,43813F-HRTimelineGroup
Louisiana State Employees Retirement Sy…15,600$1.77M0.03%-90013F-HR/ATimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …15,561$1.77M<0.01%-11,84913F-HRTimelineGroup
Assenagon Asset Management S.A.15,366$1.74M<0.01%-89,43513F-HR/ATimeline
Treasurer of the State of North Carolina14,886$1.69M<0.01%-72013F-HRTimeline
Paralel Advisors LLC14,039$1.59M0.06%new13F-HRTimeline
Man Group plcin group Man Group plc14,008$1.59M<0.01%+27013F-HRTimelineGroup
EXCHANGE TRADED CONCEPTS, LLC13,383$1.52M0.01%+35113F-HR/ATimeline
ExodusPoint Capital Management, LP13,183$1.5M0.01%-10,79213F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…12,234$1.39M<0.01%-60713F-HRTimelineGroup
Gotham Asset Management, LLC11,762$1.33M<0.01%-48,45113F-HRTimeline
State of Alaska, Department of Revenue11,704$1.33M0.01%-6,69013F-HRTimeline
Sanctuary Advisors, LLC11,676$1.33M0.01%-2,33913F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC11,597$1.32M<0.01%-3,68913F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…11,576$1.31M<0.01%-2,52913F-HRTimeline
FRED ALGER MANAGEMENT, LLCin group FRED ALGER MANAGEMENT, LLC11,398$1.29M<0.01%-19613F-HRTimelineGroup
CAPTRUST FINANCIAL ADVISORS11,169$1.27M<0.01%-8,53913F-HRTimeline
CAXTON ASSOCIATES LLP10,884$1.24M0.02%new13F-HRTimeline
Handelsbanken Fonder AB10,744$1.22M<0.01%+1,40013F-HRTimeline
Headlands Technologies LLC10,603$1.2M0.13%new13F-HRTimeline
AMALGAMATED BANK10,596$1.2M0.01%-70913F-HRTimeline
denkapparat Operations GmbH10,562$1.2M0.39%+7,98813F-HRTimeline
Summit Trail Advisors, LLC10,375$1.18M0.01%+1,97313F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…10,362$1.18M<0.01%-2,90713F-HRTimeline
Focus Partners Wealthgroup of 2 filers holding10,306$1.17M-16,656Timeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN9,993$1.13M<0.01%+5,06613F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …9,871$1.12M<0.01%+1,82113F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM9,809$1.11M0.01%-40113F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…9,647$1.09M<0.01%-49313F-HRTimelineGroup
YOUSIF CAPITAL MANAGEMENT, LLC9,557$1.08M0.01%-55913F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…9,202$1.04M0.01%-6,81013F-HRTimeline
RNC CAPITAL MANAGEMENT LLC9,029$1.02M0.04%+3,91113F-HRTimeline
Interval Partners, LP8,648$981K0.03%-17,83013F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…8,428$956K<0.01%-76413F-HRTimeline
KLP KAPITALFORVALTNING AS8,200$931K<0.01%013F-HRTimeline
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.8,100$919K<0.01%-244,72513F-HRTimelineGroup
OREGON PUBLIC EMPLOYEES RETIREMENT FUND8,089$918K0.01%-41013F-HRTimeline
Arax Advisory Partners7,818$887K0.01%+5,52013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC7,792$884K<0.01%+1,94813F-HRTimelineGroup
DekaBank Deutsche Girozentrale5,080$836K<0.01%013F-HRTimeline
Bridgewater Associates, LP7,024$797K<0.01%+1,41613F-HRTimeline
Maryland State Retirement & Pension Sys…6,898$783K0.01%-24913F-HRTimeline
Jain Global LLC6,250$709K0.01%new13F-HRTimeline
TWINBEECH CAPITAL LP6,167$700K0.13%new13F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK6,035$684K<0.01%013F-HRTimelineGroup
Stiles Financial Services Inc5,992$680K0.17%-77513F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.5,849$664K<0.01%+51913F-HRTimelineGroup
Fieldview Capital Management, LLC5,602$636K0.18%+4,19213F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…5,510$625K<0.01%-10013F-HRTimelineGroup
Parvin Asset Management, LLC5,425$616K0.49%-34513F-HRTimeline
Lido Advisors, LLCin group Lido Advisors, LLC5,296$601K<0.01%+1,74513F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP5,318$599K<0.01%-1,35613F-HRTimelineGroup
Chicago Partners Investment Group LLC5,210$596K0.01%+1,30513F-HRTimeline
CSS LLC/IL5,030$571K0.03%new13F-HRTimeline
Schonfeld Strategic Advisors LLC4,911$557K<0.01%-37,68513F-HRTimeline
Corient Private Wealth LPin group Corient Private Wealth LP4,834$549K<0.01%+2,44213F-HR/ATimelineGroup
EntryPoint Capital, LLC4,737$538K0.13%new13F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…4,716$535K<0.01%+1,10213F-HRTimelineGroup
SG Americas Securities, LLC4,536$515K<0.01%-1,49613F-HRTimeline
New York Life Investment Management LLCin group New York Life Investment Mana…4,472$508K<0.01%+2713F-HRTimelineGroup
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…4,415$501K<0.01%+16113F-HRTimelineGroup
DIVERSIFIED TRUST CO4,313$489K0.01%-1,34213F-HRTimeline
ROTHSCHILD INVESTMENT LLC4,148$471K0.02%+2,02313F-HRTimeline
Blueshift Asset Management, LLC4,144$470K0.11%+68013F-HRTimeline
LPL Financial LLC4,119$467K<0.01%-13413F-HRTimeline
ASSETMARK, INCin group ASSETMARK, INC4,118$467K<0.01%+1,46313F-HRTimelineGroup
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …4,104$465K<0.01%-43813F-HRTimelineGroup