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Disclosery

MREO MEREO BIOPHARMA GROUP PLC

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CMN (ADR), issuer CIK 1719714

82 managers (84 13F filers) reported a position in MREO shares at 2025-09-30, 100,236,618 shares in all. 14 filers opened a position and 16 filers sold out during the quarter.

Managers
82
13F filers
84
New
14
Added
23
Reduced
23
Sold out
16
Shares held by filers
100,236,618

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
JANUS HENDERSON GROUP PLCin group Janus Henderson16,290,130$33.6M0.02%-1,398,46213F-HRTimelineGroup
Rubric Capital Management LP15,307,347$31.5M0.42%013F-HRTimeline
Frazier Life Sciences Management, L.P.9,440,112$19.4M0.58%013F-HRTimeline
MANGROVE PARTNERS IM, LLC7,790,580$16M1.19%-845,90513F-HRTimeline
Aberdeen Group plcin group Aberdeen Group plc5,538,699$11.4M0.02%+2,509,82713F-HRTimelineGroup
683 Capital Management, LLCin group 683 Capital Management, LLC4,875,000$10M0.91%+525,00013F-HRTimelineGroup
Rock Springs Capital Management LP4,570,649$9.42M0.55%+105,35713F-HRTimeline
Clearline Capital LP3,834,163$7.9M0.68%+216,00013F-HRTimeline
ALKEON CAPITAL MANAGEMENT LLC3,698,100$7.62M0.03%-1,000,00013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY3,346,347$6.89M<0.01%+2,560,97013F-HR/ATimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC3,171,632$6.53M0.01%+2,410,97313F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding2,877,442$5.93M+2,503,937Timeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC2,364,024$4.87M<0.01%-726,04413F-HRTimelineGroup
Tejara Capital Ltd1,906,844$3.93M2.15%-523,59313F-HRTimeline
Schonfeld Strategic Advisors LLC1,732,724$3.57M0.02%+823,08413F-HRTimeline
FMR LLCin group FMR LLC1,454,900$3M<0.01%-23,60013F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding1,330,296$2.74M+526,538Timeline
Blue Owl Capital Holdings LP1,250,000$2.58M0.8%new13F-HRTimeline
Monaco Asset Management SAM945,915$1.95M0.73%+550,91513F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP767,744$1.58M<0.01%013F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC590,871$1.22M<0.01%-889,60013F-HRTimeline
Logos Global Management LP500,000$1.03M0.1%new13F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…493,378$1.02M<0.01%+131,83613F-HRTimelineGroup
Artia Global Partners LP475,361$979K0.17%013F-HR/ATimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC452,362$932K<0.01%+204,92113F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.444,004$915K<0.01%-11,36113F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/438,622$904K<0.01%-3913F-HR/ATimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC337,503$695K<0.01%-258,17013F-HRTimelineGroup
Knott David M Jr300,337$619K0.26%-19,00013F-HRTimeline
Soleus Capital Management, L.P.299,711$617K0.03%-300,00013F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…265,000$546K<0.01%-185,00013F-HR/ATimelineGroup
Knoll Capital Management, LLC260,470$537K0.29%013F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC256,378$522K<0.01%new13F-HRTimelineGroup
SIMPLEX TRADING, LLC196,269$404K0.01%-4,87213F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd191,037$394K0.02%+121,69613F-HRTimelineGroup
Caption Management, LLC189,914$391K0.02%-7,68513F-HRTimeline
GROUP ONE TRADING LLC136,588$281K0.01%-2,97113F-HRTimeline
STATE STREET CORPin group STATE STREET CORP132,701$273K<0.01%+87,75913F-HRTimelineGroup
CANTOR FITZGERALD, L. P.in group CANTOR FITZGERALD, L. P.110,000$227K<0.01%-232,95713F-HR/ATimelineGroup
NOMURA HOLDINGS INCin group NOMURA ASSET MANAGEMENT CO LTD103,800$214K<0.01%-21,20013F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC92,534$191K<0.01%013F-HRTimelineGroup
Atle Fund Management AB764,901$167K0.62%013F-HRTimeline
Clear Harbor Asset Management, LLC77,000$159K0.01%+35,00013F-HR/ATimeline
GSA CAPITAL PARTNERS LLP58,145$120K0.01%new13F-HRTimeline
Aquatic Capital Management LLC53,712$111K<0.01%+26,78213F-HRTimeline
Significant Wealth Partners LLC47,814$98.5K0.05%+25,55313F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…40,930$84.3K0.02%+7,10513F-HRTimelineGroup
Avanza Fonder AB38,235$78.8K<0.01%013F-HRTimeline
Three Magnolias Financial Advisors, LLC37,000$76.2K0.05%013F-HRTimeline
HRT FINANCIAL LP34,852$71K<0.01%new13F-HRTimeline
Forefront Analytics, LLC33,180$68.4K0.07%+14,04213F-HRTimeline
Forefront Wealth Partners, LLC33,180$68.4K0.02%new13F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC30,055$61.9K<0.01%+9,38713F-HRTimelineGroup
Centiva Capital, LP25,000$51.5K<0.01%013F-HRTimeline
Federation des caisses Desjardins du Qu…21,271$43.8K<0.01%new13F-HRTimeline
Ascentis Independent Advisorsin group Ascentis Wealth Management, L…19,900$41K0.01%013F-HRTimelineGroup
OneDigital Investment Advisors LLC18,300$37.7K<0.01%013F-HRTimeline
PFG Investments, LLC17,150$35.3K<0.01%-20,28313F-HRTimeline
Sheets Smith Investment Management16,890$34.8K0.02%013F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC15,970$33K<0.01%new13F-HRTimelineGroup
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…15,644$32.2K<0.01%new13F-HRTimelineGroup
NFSG Corp13,000$26.8K<0.01%013F-HRTimeline
Scientech Research LLC10,124$20.9K0.01%new13F-HRTimeline
LEVEL FOUR ADVISORY SERVICES, LLCin group LEVEL FOUR ADVISORY SERVICES,…10,000$20.6K<0.01%013F-HRTimelineGroup
GAMMA Investing LLC9,181$18.9K<0.01%-7613F-HRTimeline
RHUMBLINE ADVISERS9,122$18.8K<0.01%-75613F-HRTimeline
Caitong International Asset Management …8,476$17.5K0.01%+3,93213F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.5,677$9.71K<0.01%+30013F-HRTimelineGroup
Arax Advisory Partners4,000$8.24K<0.01%013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…2,000$4.12K<0.01%new13F-HRTimelineGroup
Allworth Financial LP1,573$3.24K<0.01%-6413F-HRTimeline
GPS Wealth Strategies Group, LLC1,500$3.09K<0.01%013F-HRTimeline
Wealthspire Advisors, LLC1,026$2.11K<0.01%new13F-HRTimeline
SIT INVESTMENT ASSOCIATES INCin group SIT INVESTMENT ASSOCIATES INC970$2K<0.01%013F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…417$859<0.01%-5313F-HRTimelineGroup
MAI Capital Management309$637<0.01%013F-HRTimeline
New England Capital Financial Advisors …300$618<0.01%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN230$473<0.01%013F-HRTimelineGroup
PRINCIPAL SECURITIES, INC.in group PRINCIPAL FINANCIAL GROUP INC75$155<0.01%013F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\13$27<0.01%013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS3$6<0.01%013F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA5$00%new13F-HRTimelineGroupValue filed as zero, left out of ratios.