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Disclosery

MREO MEREO BIOPHARMA GROUP PLC

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CMN (ADR), issuer CIK 1719714

86 managers (87 13F filers) reported a position in MREO shares at 2025-06-30, 98,747,167 shares in all. 12 filers opened a position and 16 filers sold out during the quarter.

Managers
86
13F filers
87
New
12
Added
31
Reduced
19
Sold out
16
Shares held by filers
98,747,167

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
JANUS HENDERSON GROUP PLCin group Janus Henderson17,688,592$48.1M0.02%-5,046,52913F-HRTimelineGroup
Rubric Capital Management LP15,307,347$41.5M0.67%013F-HRTimeline
Frazier Life Sciences Management, L.P.9,440,112$25.6M1.02%+1,620,24913F-HRTimeline
MANGROVE PARTNERS IM, LLC8,636,485$23.4M2.51%013F-HRTimeline
DEERFIELD MANAGEMENT COMPANY, L.P.in group DEERFIELD MANAGEMENT COMPANY,…6,710,429$18.2M0.33%013F-HRTimelineGroup
ALKEON CAPITAL MANAGEMENT LLC4,698,100$12.7M0.06%013F-HRTimeline
Rock Springs Capital Management LP4,465,292$12.1M0.75%-2,218,95513F-HRTimeline
683 Capital Management, LLCin group 683 Capital Management, LLC4,350,000$11.8M1.2%-285,00013F-HRTimelineGroup
Clearline Capital LP3,618,163$9.81M0.86%+400,26913F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC3,090,068$8.37M<0.01%+964,14813F-HRTimelineGroup
Aberdeen Group plcin group Aberdeen Group plc3,028,872$8.21M0.01%+840,51813F-HRTimelineGroup
Tejara Capital Ltd2,430,437$6.59M3.05%-90,88713F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC1,480,471$4.01M0.01%+130,00013F-HRTimeline
FMR LLCin group FMR LLC1,478,500$4.01M<0.01%+719,40013F-HRTimelineGroup
Schonfeld Strategic Advisors LLC909,640$2.47M0.02%-681,41613F-HRTimeline
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding803,758$2.18M+529,252Timeline
MORGAN STANLEYin group MORGAN STANLEY785,377$2.13M<0.01%-1,394,26513F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP767,744$2.08M<0.01%013F-HRTimelineGroup
Atle Fund Management AB764,901$2.07M0.89%+374,90113F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC760,659$2.06M<0.01%+417,00613F-HRTimelineGroup
Soleus Capital Management, L.P.599,711$1.63M0.11%-87,24213F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC595,673$1.61M<0.01%+201,24213F-HRTimelineGroup
Artia Global Partners LP475,361$1.29M0.33%+54,00213F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.455,365$1.23M<0.01%+181,00413F-HRTimelineGroup
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…450,000$1.22M0.01%013F-HR/ATimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/438,661$1.19M<0.01%-913F-HRTimelineGroup
Monaco Asset Management SAM395,000$1.07M0.41%-21,46813F-HRTimeline
UBS Group AGgroup of 2 filers holding373,505$1.01M-2,127,616Timeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…361,542$980K<0.01%+187,16413F-HRTimelineGroup
CANTOR FITZGERALD, L. P.in group CANTOR FITZGERALD, L. P.342,957$929K0.02%-12,04313F-HRTimelineGroup
Knott David M Jr319,337$865K0.39%013F-HRTimeline
Paloma Partners Management Coin group Paloma Partners Management Co296,659$804K0.18%new13F-HRTimelineGroup
Knoll Capital Management, LLC260,470$706K0.5%013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC247,441$671K<0.01%+102,63813F-HRTimelineGroup
SIMPLEX TRADING, LLC201,141$545K0.01%+197,02413F-HRTimeline
Caption Management, LLC197,599$535K0.05%+92,81613F-HRTimeline
GROUP ONE TRADING LLC139,559$378K0.01%+105,27813F-HRTimeline
Dauntless Investment Group, LLC134,122$363K1.71%new13F-HRTimelineThe filing omitted confidential holdings, a later amendment may add them.
NOMURA HOLDINGS INCin group NOMURA ASSET MANAGEMENT CO LTD125,000$339K<0.01%new13F-HR/ATimelineGroup
NEOS Investment Management LLC102,583$278K<0.01%-552,08313F-HRTimeline
Tema ETFs LLC102,583$278K0.07%-552,08313F-HRTimeline
Leonteq Securities AG100,000$271K0.02%new13F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC92,534$251K<0.01%+37813F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd69,341$188K0.01%new13F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.59,200$160K<0.01%+23,38413F-HRTimelineGroup
J. Goldman & Co LP52,384$142K<0.01%-27,00313F-HRTimeline
STATE STREET CORPin group STATE STREET CORP44,942$122K<0.01%-71713F-HRTimelineGroup
Clear Harbor Asset Management, LLC42,000$114K0.01%013F-HRTimeline
Avanza Fonder AB38,235$104K<0.01%+10,11413F-HRTimeline
PFG Investments, LLC37,433$101K0.01%013F-HRTimeline
Three Magnolias Financial Advisors, LLC37,000$100K0.07%new13F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…33,825$91.7K0.03%-10,18213F-HRTimelineGroup
Aquatic Capital Management LLC26,930$73K<0.01%new13F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd25,399$69.1K<0.01%+2,71213F-HRTimelineGroup
Centiva Capital, LP25,000$67.8K<0.01%013F-HRTimeline
Significant Wealth Partners LLC22,261$60.3K0.03%+8,49013F-HRTimeline
Graham Capital Management, L.P.21,176$57.4K<0.01%-28,24213F-HRTimeline
Cubist Systematic Strategies, LLC21,099$57.2K<0.01%new13F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC20,668$56K<0.01%+2,73713F-HR/ATimelineGroup
Ascentis Independent Advisorsin group Ascentis Wealth Management, L…19,900$53.9K0.01%013F-HRTimelineGroup
Forefront Analytics, LLC19,138$51.9K0.06%-28,49213F-HR/ATimeline
OneDigital Investment Advisors LLC18,300$49.6K<0.01%013F-HRTimeline
Sheets Smith Investment Management16,890$45.8K0.04%013F-HRTimeline
NFSG Corp13,000$35.2K0.01%+2,00013F-HRTimeline
LEVEL FOUR ADVISORY SERVICES, LLCin group LEVEL FOUR ADVISORY SERVICES,…10,000$27.1K<0.01%013F-HRTimelineGroup
Marex Group Ltdin group Marex Group Ltd10,000$27.1K<0.01%013F-HRTimelineGroup
RHUMBLINE ADVISERS9,878$26.8K<0.01%+3,29013F-HRTimeline
GAMMA Investing LLC9,257$25.1K<0.01%+87713F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.5,377$14.6K<0.01%+2,31413F-HR/ATimelineGroup
Caitong International Asset Management …4,544$12.3K0.01%+3,06013F-HRTimeline
Arax Advisory Partners4,000$10.8K<0.01%013F-HRTimeline
Allworth Financial LP1,637$4.44K<0.01%+13713F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC1,570$4.25K<0.01%new13F-HRTimelineGroup
GPS Wealth Strategies Group, LLC1,500$4.07K<0.01%013F-HRTimeline
SIT INVESTMENT ASSOCIATES INCin group SIT INVESTMENT ASSOCIATES INC970$3K<0.01%013F-HRTimelineGroup
Brooklyn Investment Group849$2.3K<0.01%new13F-HR/ATimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…470$1.27K<0.01%new13F-HRTimelineGroup
MAI Capital Management309$838<0.01%013F-HRTimeline
New England Capital Financial Advisors …300$813<0.01%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN230$622<0.01%-1,00013F-HRTimelineGroup
SIGNATUREFD, LLC187$507<0.01%new13F-HRTimeline
Transce3nd, LLC127$344<0.01%013F-HRTimeline
PRINCIPAL SECURITIES, INC.in group PRINCIPAL FINANCIAL GROUP INC75$203<0.01%+4313F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\13$35<0.01%013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS3$8<0.01%013F-HRTimelineGroup
CONCOURSE FINANCIAL GROUP SECURITIES, I…0$0013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.