Mereo BioPharma Group plc - MREO

Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 3 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.

Shareholders (13F)

Quarter: Q4 2025 · Compare: Q3 2025
13D/13G major owners: Ownership tab.
Methodology: Market value and % of portfolio use SEC reported VALUE ($000). For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received. Details.
Rows: 0
Investor History Status Shares held Market value ($000) % of portfolio Previous % Rank Change in shares % change in shares Source Date reported
Rubric Capital Management LP History No change 15,307,347 6,378 0.08% 0.36% 1 0 0.0% Q4 2025 Feb 13, 2026
683 Capital Management, LLC History Added to 15,025,000 6,260 0.27% 0.52% 2 +10,150,000 208.21% Q4 2025 Feb 17, 2026
EcoR1 Capital, LLC History New 7,856,466 3,273 0.15% 3 +7,856,466 New Q4 2025 Feb 17, 2026
Schonfeld Strategic Advisors LLC History Added to 6,090,381 2,537 0.01% 0.02% 4 +4,357,657 251.49% Q4 2025 Feb 17, 2026
Tejara Capital Ltd History Added to 2,159,681 899 0.21% 2.05% 5 +252,837 13.26% Q4 2025 Feb 05, 2026
DIADEMA PARTNERS LP History Added to 1,999,500 833 0.14% 0.82% 6 +439,900 28.21% Q4 2025 Feb 17, 2026
Logos Global Management LP History Added to 1,850,000 770 0.05% 0.09% 7 +1,350,000 270.0% Q4 2025 Feb 17, 2026
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC History Reduced 1,763,666 735 0.0% 0.0% 8 -143,109 -7.51% Q4 2025 Feb 13, 2026
Monaco Asset Management SAM History Added to 1,585,214 660 0.11% 0.12% 9 +639,299 67.59% Q4 2025 Feb 10, 2026
UBS Group AG History Added to 1,558,931 650 0.0% 0.0% 10 +588,264 60.6% Q4 2025 Jan 29, 2026
BALYASNY ASSET MANAGEMENT L.P. History New 1,280,275 533 0.0% 11 +1,280,275 New Q4 2025 Feb 17, 2026
MORGAN STANLEY History Reduced 1,273,785 530 0.0% 0.0% 12 -2,072,562 -61.94% Q4 2025 Feb 13, 2026
JANE STREET GROUP, LLC History Added to 873,704 364 0.0% 0.0% 13 +389,142 80.31% Q4 2025 Feb 12, 2026
CITADEL ADVISORS LLC History Reduced 748,700 311 0.0% 0.0% 14 -2,503,932 -76.98% Q4 2025 Feb 17, 2026
DLD Asset Management, LP History Added to 746,000 310 0.02% 0.02% 15 +627,000 526.89% Q4 2025 Feb 13, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP History Added to 694,100 291 0.0% 0.0% 16 +23,922 3.57% Q4 2025 Feb 17, 2026
TWO SIGMA INVESTMENTS, LP History Reduced 525,125 218 0.0% 0.0% 17 -562,971 -51.74% Q4 2025 Feb 17, 2026
GROUP ONE TRADING LLC History Added to 441,636 184 0.0% 0.0% 18 +305,048 223.33% Q4 2025 Feb 12, 2026
SIMPLEX TRADING, LLC History Added to 419,477 174 0.0% 0.0% 19 +223,208 113.73% Q4 2025 Feb 11, 2026
EntryPoint Capital, LLC History New 400,700 166 0.06% 20 +400,700 New Q4 2025 Feb 12, 2026
LUMINUS MANAGEMENT LLC History New 395,000 164 0.14% 21 +395,000 New Q4 2025 Feb 17, 2026
Rangeley Capital, LLC History New 364,000 151 0.13% 22 +364,000 New Q4 2025 Feb 17, 2026
BlackRock, Inc. History Reduced 312,613 130 0.0% 0.0% 23 -131,391 -29.59% Q4 2025 Feb 12, 2026
Knott David M Jr History No change 300,337 125 0.06% 0.25% 24 0 0.0% Q4 2025 Feb 12, 2026
Quadrature Capital Ltd History New 266,731 111 0.0% 25 +266,731 New Q4 2025 Feb 17, 2026
SPHERA FUNDS MANAGEMENT LTD. History New 255,400 106 0.02% 26 +255,400 New Q4 2025 Feb 17, 2026
TWO SIGMA ADVISERS, LP History Added to 251,900 104 0.0% 0.0% 27 +9,700 4.0% Q4 2025 Feb 17, 2026
Newtyn Management, LLC History New 224,622 93 0.01% 28 +224,622 New Q4 2025 Feb 17, 2026
CITIGROUP INC History New 195,814 81 0.0% 29 +195,814 New Q4 2025 Feb 13, 2026
RENAISSANCE TECHNOLOGIES LLC History Reduced 194,371 80 0.0% 0.0% 30 -396,500 -67.1% Q4 2025 Feb 12, 2026
ADAR1 Capital Management, LLC History New 150,000 62 0.0% 31 +150,000 New Q4 2025 Feb 18, 2026
STATE STREET CORP History Reduced 130,643 54 0.0% 0.0% 32 -2,058 -1.55% Q4 2025 Feb 13, 2026
Virtus Investment Advisers, LLC History Added to 122,595 51 0.01% 0.02% 33 +81,665 199.52% Q4 2025 Feb 17, 2026
Graham Capital Management, L.P. History New 116,286 48 0.0% 34 +116,286 New Q4 2025 Feb 17, 2026
GEODE CAPITAL MANAGEMENT, LLC History No change 92,534 38 0.0% 0.0% 35 0 0.0% Q4 2025 Feb 09, 2026
MILLENNIUM MANAGEMENT LLC History Reduced 83,646 34 0.0% 0.0% 36 -311,557 -78.83% Q4 2025 Feb 17, 2026
Baader Bank Aktiengesellschaft History New 128,742 33 0.0% 37 +128,742 New Q4 2025 Feb 05, 2026
ACADIAN ASSET MANAGEMENT LLC History Reduced 61,435 24 0.0% 0.0% 38 -194,943 -76.04% Q4 2025 Feb 10, 2026
Caption Management, LLC History Reduced 50,000 20 0.0% 0.01% 40 -520,414 -91.23% Q4 2025 Feb 17, 2026
Engineers Gate Manager LP History New 49,798 20 0.0% 39 +49,798 New Q4 2025 Feb 17, 2026
Clear Harbor Asset Management, LLC History Reduced 35,000 14 0.0% 0.01% 41 -42,000 -54.55% Q4 2025 Feb 10, 2026
Forefront Analytics, LLC History Reduced 31,768 13 0.01% 0.07% 42 -1,412 -4.26% Q4 2025 Feb 17, 2026
GOLDMAN SACHS GROUP INC History Reduced 28,026 11 0.0% 0.0% 43 -2,335,998 -98.81% Q4 2025 Mar 25, 2026
BANK OF AMERICA CORP /DE/ History Reduced 25,492 10 0.0% 0.0% 44 -413,130 -94.19% Q4 2025 Feb 17, 2026
Centiva Capital, LP History No change 25,000 10 0.0% 0.0% 45 0 0.0% Q4 2025 Feb 13, 2026
Significant Wealth Partners LLC History Reduced 21,689 9 0.01% 0.05% 46 -26,125 -54.64% Q4 2025 Jan 07, 2026
Aquatic Capital Management LLC History Reduced 21,216 8 0.0% 0.0% 48 -32,496 -60.5% Q4 2025 Feb 17, 2026
SmartHarvest Portfolios, LLC History New 20,290 8 0.0% 49 +20,290 New Q4 2025 Feb 12, 2026
BARCLAYS PLC History Added to 20,100 8 0.0% 0.0% 47 +14,500 258.93% Q4 2025 Feb 13, 2026
Three Magnolias Financial Advisors, LLC History Reduced 19,000 7 0.0% 0.05% 53 -18,000 -48.65% Q4 2025 Jan 20, 2026
RHUMBLINE ADVISERS History Added to 19,146 7 0.0% 0.0% 50 +10,024 109.89% Q4 2025 Feb 13, 2026
Newbridge Financial Services Group, Inc. History Added to 17,000 7 0.0% 0.0% 52 +4,000 30.77% Q4 2025 Jan 21, 2026
OneDigital Investment Advisors LLC History No change 18,300 7 0.0% 0.0% 51 0 0.0% Q4 2025 Feb 13, 2026
PFG Investments, LLC History Reduced 16,650 6 0.0% 0.0% 54 -500 -2.92% Q4 2025 Jan 26, 2026
QRG CAPITAL MANAGEMENT, INC. History New 13,503 5 0.0% 57 +13,503 New Q4 2025 Feb 02, 2026
AE Wealth Management LLC History New 12,563 5 0.0% 56 +12,563 New Q4 2025 Jan 26, 2026
MML INVESTORS SERVICES, LLC History New 12,200 5 0.0% 55 +12,200 New Q4 2025 Feb 13, 2026
Astoria Portfolio Advisors LLC. History New 10,000 4 0.0% 58 +10,000 New Q4 2025 Feb 24, 2026
GAMMA Investing LLC History Added to 9,561 3 0.0% 0.0% 59 +380 4.14% Q4 2025 Jan 05, 2026
TORONTO DOMINION BANK History New 5,500 2 0.0% 60 +5,500 New Q4 2025 Feb 17, 2026
Caitong International Asset Management Co., Ltd History Reduced 4,462 1 0.0% 0.01% 62 -4,014 -47.36% Q4 2025 Mar 03, 2026
Arax Advisory Partners History No change 4,000 1 0.0% 0.0% 61 0 0.0% Q4 2025 Feb 13, 2026
JANUS HENDERSON GROUP PLC History Closed out 0 0 0.02% -16,290,130 -100.0% Q3 2025 Nov 14, 2025
Frazier Life Sciences Management, L.P. History Closed out 0 0 0.58% -9,440,112 -100.0% Q3 2025 Nov 14, 2025
MANGROVE PARTNERS IM, LLC History Closed out 0 0 1.19% -7,790,580 -100.0% Q3 2025 Nov 14, 2025
Aberdeen Group plc History Closed out 0 0 0.02% -5,538,699 -100.0% Q3 2025 Nov 07, 2025
Rock Springs Capital Management LP History Closed out 0 0 0.55% -4,570,649 -100.0% Q3 2025 Nov 14, 2025
Clearline Capital LP History Closed out 0 0 0.36% -3,834,163 -100.0% Q3 2025 Nov 14, 2025
ALKEON CAPITAL MANAGEMENT LLC History Closed out 0 0 0.01% -3,698,100 -100.0% Q3 2025 Nov 14, 2025
FMR LLC History Closed out 0 0 0.0% -1,454,900 -100.0% Q3 2025 Nov 13, 2025
Blue Owl Capital Holdings LP History Closed out 0 0 0.8% -1,250,000 -100.0% Q3 2025 Nov 12, 2025
MARSHALL WACE, LLP History Closed out 0 0 0.0% -767,744 -100.0% Q3 2025 Nov 13, 2025
Atle Fund Management AB History Closed out 0 0 0.62% -764,901 -100.0% Q3 2025 Nov 04, 2025
Artia Global Partners LP History Closed out 0 0 0.16% -475,361 -100.0% Q3 2025 Nov 14, 2025
Soleus Capital Management, L.P. History Closed out 0 0 0.03% -299,711 -100.0% Q3 2025 Nov 14, 2025
Hudson Bay Capital Management LP History Closed out 0 0 0.0% -265,000 -100.0% Q3 2025 Dec 15, 2025
Knoll Capital Management, LLC History Closed out 0 0 0.29% -260,470 -100.0% Q3 2025 Nov 14, 2025
XTX Topco Ltd History Closed out 0 0 0.02% -191,037 -100.0% Q3 2025 Nov 14, 2025
CANTOR FITZGERALD, L. P. History Closed out 0 0 0.0% -110,000 -100.0% Q3 2025 Feb 17, 2026
NOMURA HOLDINGS INC History Closed out 0 0 0.0% -103,800 -100.0% Q3 2025 Nov 14, 2025
GSA CAPITAL PARTNERS LLP History Closed out 0 0 0.01% -58,145 -100.0% Q3 2025 Nov 07, 2025
Avanza Fonder AB History Closed out 0 0 0.0% -38,235 -100.0% Q3 2025 Oct 16, 2025
HRT FINANCIAL LP History Closed out 0 0 0.0% -34,852 -100.0% Q3 2025 Nov 14, 2025
Forefront Wealth Partners, LLC History Closed out 0 0 0.02% -33,180 -100.0% Q3 2025 Oct 20, 2025
Squarepoint Ops LLC History Closed out 0 0 0.0% -30,055 -100.0% Q3 2025 Nov 14, 2025
Federation des caisses Desjardins du Quebec History Closed out 0 0 0.0% -21,271 -100.0% Q3 2025 Nov 14, 2025
Golden State Equity Partners History Closed out 0 0 0.01% -19,900 -100.0% Q3 2025 Oct 21, 2025
Virtu Financial LLC History Closed out 0 0 0.0% -15,970 -100.0% Q3 2025 Nov 14, 2025
State of New Jersey Common Pension Fund D History Closed out 0 0 0.0% -15,644 -100.0% Q3 2025 Nov 07, 2025
Scientech Research LLC History Closed out 0 0 0.01% -10,124 -100.0% Q3 2025 Nov 14, 2025
LEVEL FOUR ADVISORY SERVICES, LLC History Closed out 0 0 0.0% -10,000 -100.0% Q3 2025 Nov 12, 2025
OSAIC HOLDINGS, INC. History Reduced 500 0 0.0% -5,177 -91.19% Q4 2025 Feb 17, 2026
Allworth Financial LP History New 1,611 0 +1,611 New Q4 2025 Feb 05, 2026
WELLS FARGO & COMPANY/MN History Added to 1,737 0 +1,507 655.22% Q4 2025 Feb 13, 2026
GPS Wealth Strategies Group, LLC History Closed out 0 0 0.0% -1,500 -100.0% Q3 2025 Nov 03, 2025
Wealthspire Advisors, LLC History Closed out 0 0 0.0% -1,026 -100.0% Q3 2025 Nov 14, 2025
SageView Advisory Group, LLC History New 161 0 +161 New Q4 2025 Feb 17, 2026
PRINCIPAL SECURITIES, INC. History Closed out 0 0 -75 -100.0% Q3 2025 Nov 12, 2025
Farther Finance Advisors, LLC History New 17 0 +17 New Q4 2025 Jan 23, 2026
US BANCORP \DE\ History No change 13 0 0 0.0% Q4 2025 Jan 30, 2026
SIT INVESTMENT ASSOCIATES INC History No change 970 0 0.0% 0 0.0% Q4 2025 Feb 25, 2026
MAI Capital Management History No change 309 0 0 0.0% Q4 2025 Feb 13, 2026
BNP PARIBAS FINANCIAL MARKETS History No change 3 0 0 0.0% Q4 2025 Feb 10, 2026
EverSource Wealth Advisors, LLC History No change 417 0 0 0.0% Q4 2025 Feb 06, 2026
Rockefeller Capital Management L.P. History No change 2,000 0 0.0% 0 0.0% Q4 2025 Mar 16, 2026
New England Capital Financial Advisors LLC History No change 300 0 0 0.0% Q4 2025 Feb 02, 2026