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Disclosery

MREO MEREO BIOPHARMA GROUP PLC

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CMN (ADR), issuer CIK 1719714

63 managers (63 13F filers) reported a position in MREO shares at 2026-03-31, 75,380,537 shares in all. 14 filers opened a position and 22 filers sold out during the quarter.

Managers
63
13F filers
63
New
14
Added
15
Reduced
16
Sold out
22
Shares held by filers
75,380,537

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
Rubric Capital Management LP15,307,347$5.05M0.06%013F-HRTimeline
EcoR1 Capital, LLC13,368,855$4.41M0.19%+5,512,38913F-HRTimeline
683 Capital Management, LLCin group 683 Capital Management, LLC12,000,000$3.96M0.37%-3,025,00013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/8,195,287$2.7M<0.01%+8,169,79513F-HRTimelineGroup
Defilade Capital Management, L.P.7,558,756$2.49M0.35%new13F-HR/ATimeline
Newtyn Management, LLC7,079,056$2.34M0.25%+6,854,43413F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC3,559,103$1.17M<0.01%+3,475,45713F-HRTimelineGroup
Tejara Capital Ltd2,037,520$672K0.22%-122,16113F-HRTimeline
UBS Group AGgroup of 2 filers holding1,490,128$492K-1,832,469Timeline
Wealthspire Advisors, LLC796,036$263K<0.01%new13F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP686,987$227K<0.01%new13F-HRTimelineGroup
GROUP ONE TRADING LLC335,827$111K<0.01%-105,80913F-HRTimeline
Rangeley Capital, LLC329,200$109K0.12%-34,80013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.302,991$100K<0.01%-9,62213F-HRTimelineGroup
Knott David M Jr300,337$99.1K0.06%013F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC209,084$68K<0.01%+147,64913F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…195,920$64.7K<0.01%new13F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP187,839$62K<0.01%-337,28613F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC150,000$49.5K<0.01%013F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC139,973$46.2K<0.01%-216,03113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP133,379$44K<0.01%+2,73613F-HRTimelineGroup
Forefront Analytics, LLC127,778$42.2K0.04%+96,01013F-HRTimeline
Virtus Investment Advisers, LLCin group Virtus Investment Advisers, L…125,662$41.5K0.01%+3,06713F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC92,534$30.5K<0.01%013F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd84,469$27.9K<0.01%new13F-HRTimelineGroup
Caption Management, LLC64,064$21.1K<0.01%+14,06413F-HRTimeline
SmartHarvest Portfolios, LLC49,512$16.3K0.01%+29,22213F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC48,400$16K<0.01%-145,97113F-HRTimeline
StoneX Group Inc.in group StoneX Group Inc.36,873$12.2K<0.01%new13F-HRTimelineGroup
Virtu Financial LLCin group Virtu Financial LLC36,458$12K<0.01%new13F-HRTimelineGroup
Independent Advisor Alliance35,227$11.6K<0.01%new13F-HRTimeline
Clear Harbor Asset Management, LLC35,000$11.6K<0.01%013F-HRTimeline
Significant Wealth Partners LLC25,634$8.46K0.01%+3,94513F-HRTimeline
Centiva Capital, LP25,000$8.25K<0.01%013F-HRTimeline
Engineers Gate Manager LP23,954$7.91K<0.01%-25,84413F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO21,848$6.9K<0.01%new13F-HR/ATimelineGroup
RHUMBLINE ADVISERS19,572$6.45K<0.01%+42613F-HRTimeline
GAMMA Investing LLC19,274$6.36K<0.01%+9,71313F-HRTimeline
Three Magnolias Financial Advisors, LLC19,000$6.27K<0.01%013F-HRTimeline
NFSG Corp18,750$6.19K<0.01%+1,75013F-HRTimeline
OneDigital Investment Advisors LLC18,300$6.04K<0.01%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY16,425$5.42K<0.01%-1,257,36013F-HRTimelineGroup
IHT Wealth Management, LLC15,000$4.95K<0.01%new13F-HRTimeline
MML INVESTORS SERVICES, LLC12,200$4.03K<0.01%013F-HRTimeline
World Investment Advisors10,000$3.3K<0.01%new13F-HRTimeline
Astoria Portfolio Advisors LLC.10,000$2.8K<0.01%013F-HRTimeline
Baader Bank Aktiengesellschaft12,330$2.67K<0.01%-116,41213F-HRTimeline
Arax Advisory Partners4,000$1.32K<0.01%013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC2,496$824<0.01%-12,00413F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…2,000$660<0.01%013F-HRTimelineGroup
Allworth Financial LP1,500$495<0.01%-11113F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1,500$495<0.01%+1,00013F-HRTimelineGroup
MAI Capital Management309$102<0.01%013F-HRTimeline
New England Capital Financial Advisors …300$99<0.01%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN230$76<0.01%-1,50713F-HR/ATimelineGroup
SBI Securities Co., Ltd.114$38<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…100$33<0.01%-31713F-HR/ATimelineGroup
Sound Income Strategies, LLC66$22<0.01%new13F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/46$15<0.01%new13F-HRTimelineGroup
US BANCORP \DE\in group US BANCORP \DE\13$4<0.01%013F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS3$1<0.01%013F-HRTimelineGroup
SIT INVESTMENT ASSOCIATES INCin group SIT INVESTMENT ASSOCIATES INC970$00%013F-HRTimelineGroupValue filed as zero, left out of ratios.
Axiom Investment Management LLC1$00%13F-HRTimelineValue filed as zero, left out of ratios.