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Mersana Therapeutics
MRSN

Overview Fund Activity

109 hedge funds and large institutions have $30.3M invested in Mersana Therapeutics in 2025 Q1 according to their latest regulatory filings, with 30 funds opening new positions, 22 increasing their positions, 31 reducing their positions, and 48 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
109
Holders Change
-19
Holders Change %
-14.84%
% of All Funds
1.48%
Holding in Top 10
–
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-100%
% of All Funds
–
New
30
Increased
22
Reduced
31
Closed
48
Calls
$12K
Puts
$5K
Net Calls
+$7K
Net Calls Change
+$1.68M

Top Buyers

1
SSA
Schonfeld Strategic Advisors
New York
+$1.89M
2
AQR Capital Management
AQR Capital Management
Connecticut
+$1.77M
3
SCM
Silverarc Capital Management
Massachusetts
+$1.06M
4
Acadian Asset Management
Acadian Asset Management
Massachusetts
+$1.03M
5
Vanguard Group
Vanguard Group
Pennsylvania
+$454K

Top Sellers

1
EC
EcoR1 Capital
California
-$16.2M
2
NHAS
Novo Holdings A/S
Denmark
-$6.08M
3
BCM
Boxer Capital Management
California
-$3.77M
4
VA
VR Adviser
New York
-$2.3M
5
ACP
Acuta Capital Partners
California
-$1.6M
Name Holding Trade Value Shares
Change 		Shares
Change %
Optiver Holding
101
Optiver Holding
Netherlands
$796 +$554 +64 +229%
SS
102
SBI Securities
Japan
$471 +$394 +46 +511%
Nisa Investment Advisors
103
Nisa Investment Advisors
Missouri
$447 -$799 -93 -64%
CCM
104
Coldstream Capital Management
Washington
$377 +$377 +44 New
SCM
105
Sterling Capital Management
North Carolina
$325 -$325 -38 -50%
HNB
106
Huntington National Bank
Ohio
$275 +$275 +32 New
TWD
107
True Wealth Design
Ohio
$100 +$100 +12 New
NSIM
108
North Star Investment Management
Illinois
$52 – – –
FFA
109
Frazier Financial Advisors
Ohio
$2 -$8 – –
EC
110
EcoR1 Capital
California
– -$16.2M -453,120 Closed
NHAS
111
Novo Holdings A/S
Denmark
– -$6.08M -170,000 Closed
BCM
112
Boxer Capital Management
California
– -$3.77M -105,400 Closed
ACP
113
Acuta Capital Partners
California
– -$1.6M -44,820 Closed
BBA
114
Baker Bros. Advisors
New York
– -$1.55M -43,445 Closed
OCA
115
Octagon Capital Advisors
New York
– -$1.42M -39,680 Closed
Millennium Management
116
Millennium Management
New York
– -$1.14M -31,839 Closed
SFM
117
Sphera Funds Management
Israel
– -$987K -27,611 Closed
Wellington Management Group
118
Wellington Management Group
Massachusetts
– -$824K -23,046 Closed
D.E. Shaw & Co
119
D.E. Shaw & Co
New York
– -$779K -21,779 Closed
HP
120
HealthInvest Partners
Sweden
– -$765K -21,545 Closed
GCP
121
GSA Capital Partners
United Kingdom
– -$727K -20,332 Closed
Citadel Advisors
122
Citadel Advisors
Florida
– -$603K -16,854 Closed
Verition Fund Management
123
Verition Fund Management
Connecticut
– -$482K -13,472 Closed
ECM
124
ExodusPoint Capital Management
New York
– -$278K -7,766 Closed
Federated Hermes
125
Federated Hermes
Pennsylvania
– -$263K -7,349 Closed
3 4
5
6 7