MREO

Mereo BioPharma
MREO

Overview Fund Activity

81 hedge funds and large institutions have $266M invested in Mereo BioPharma in 2025 Q2 according to their latest regulatory filings, with 11 funds opening new positions, 29 increasing their positions, 19 reducing their positions, and 17 closing their positions.

Holders
81
Holders Change
-8
Holders Change %
-8.99%
% of All Funds
1.09%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.01%
New
11
Increased
29
Reduced
19
Closed
17
Calls
$7.93M
Puts
$3.04M
Net Calls
+$4.89M
Net Calls Change
+$3.14M

Top Buyers

1
FLSM
1
Frazier Life Sciences Management
California
$25.6M
2
Goldman Sachs
2
Goldman Sachs
New York
$8.37M
3
Aberdeen Group
3
Aberdeen Group
United Kingdom
$8.21M
4
Fidelity Investments
4
Fidelity Investments
Massachusetts
$4.01M
5
Citadel Advisors
5
Citadel Advisors
Florida
$2.06M

Top Sellers

1
Janus Henderson Group
1
Janus Henderson Group
United Kingdom
$48.1M
2
RSCM
2
Rock Springs Capital Management
Maryland
$12.1M
3
Adage Capital Partners
3
Adage Capital Partners
Massachusetts
$0
4
Morgan Stanley
4
Morgan Stanley
New York
$2.13M
5
UBS AM
5
UBS AM
Illinois
$0
Name Market Value Shares Shares
Change 		Shares
Change %
Janus Henderson Group
1
Janus Henderson Group
United Kingdom
$48.1M 17,688,592 -5,046,529 -22%
RCMNY
2
Rubric Capital Management (New York)
New York
$41.5M 15,307,347 – –
FLSM
3
Frazier Life Sciences Management
California
$25.6M 9,440,112 +1,620,249 +21%
MP
4
Mangrove Partners
Connecticut
$23.4M 8,636,485 – –
DM
5
Deerfield Management
New York
$18.2M 6,710,429 – –
Alkeon Capital Management
6
Alkeon Capital Management
New York
$12.7M 4,698,100 – –
RSCM
7
Rock Springs Capital Management
Maryland
$12.1M 4,465,292 -2,218,955 -33%
6CM
8
683 Capital Management
New York
$11.8M 4,350,000 -285,000 -6%
CC
9
Clearline Capital
New York
$9.81M 3,618,163 +400,269 +12%
Goldman Sachs
10
Goldman Sachs
New York
$8.37M 3,090,068 +964,148 +45%
Aberdeen Group
11
Aberdeen Group
United Kingdom
$8.21M 3,028,872 +840,518 +38%
TC
12
Tejara Capital
United Kingdom
$6.59M 2,430,437 -90,887 -4%
Renaissance Technologies
13
Renaissance Technologies
New York
$4.01M 1,480,471 +130,000 +10%
Fidelity Investments
14
Fidelity Investments
Massachusetts
$4.01M 1,478,500 +719,400 +95%
SSA
15
Schonfeld Strategic Advisors
New York
$2.47M 909,640 -681,416 -43%
Morgan Stanley
16
Morgan Stanley
New York
$2.13M 785,377 -1,394,265 -64%
Marshall Wace
17
Marshall Wace
United Kingdom
$2.08M 767,744 – –
HP
18
HealthInvest Partners
Sweden
$2.07M 764,901 +374,901 +96%
Citadel Advisors
19
Citadel Advisors
Florida
$2.06M 760,659 +417,006 +121%
Two Sigma Investments
20
Two Sigma Investments
New York
$1.79M 659,158 +413,952 +169%
SCM
21
Soleus Capital Management
Connecticut
$1.63M 599,711 -87,242 -13%
Millennium Management
22
Millennium Management
New York
$1.61M 595,673 +201,242 +51%
AGP
23
Artia Global Partners
Florida
$1.29M 475,361 +54,002 +13%
BlackRock
24
BlackRock
New York
$1.23M 455,365 +181,004 +66%
Hudson Bay Capital Management
25
Hudson Bay Capital Management
Connecticut
$1.22M 450,000 – –
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