MRSN icon

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 %
PFSRSONJ
76
Police & Firemen's Retirement System of New Jersey
New Jersey
$7.78K – – –
Mariner
77
Mariner
Kansas
$7.14K +$7.14K +830 New
Group One Trading
78
Group One Trading
Illinois
$6.92K -$11.1K -1,287 -62%
FPAS
79
Focus Partners Advisor Solutions
Missouri
$6.71K +$6.71K +779 New
Manulife (Manufacturers Life Insurance)
80
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$5.98K -$9.16K -1,065 -61%
NAM
81
NorthCrest Asset Manangement
Minnesota
$5.53K +$5.53K +643 New
PPW
82
Parcion Private Wealth
Washington
$5.26K +$5.26K +612 New
GC
83
Grimes & Company
Massachusetts
$4.84K -$318 -37 -6%
AHL
84
Abel Hall LLC
Louisiana
$4.7K +$4.7K +546 New
HSBC Holdings
85
HSBC Holdings
United Kingdom
$4.38K -$280 -32 -6%
Legal & General Group
86
Legal & General Group
United Kingdom
$3.82K – – –
Principal Financial Group
87
Principal Financial Group
Iowa
$3.56K +$3.56K +414 New
Victory Capital Management
88
Victory Capital Management
Texas
$3.56K -$120 -14 -3%
VOYA Investment Management
89
VOYA Investment Management
Georgia
$3.48K -$8.97K -1,043 -72%
AIP
90
Ameritas Investment Partners
Nebraska
$3.41K – – –
HPCM
91
Hunter Perkins Capital Management
Illinois
$3K – – –
SO
92
STRS Ohio
Ohio
$3K – – –
California State Teachers Retirement System (CalSTRS)
93
California State Teachers Retirement System (CalSTRS)
California
$2.83K – – –
Mirae Asset Global Investments
94
Mirae Asset Global Investments
South Korea
$1.57K – – –
PNC Financial Services Group
95
PNC Financial Services Group
Pennsylvania
$1.22K +$1.15K +133 +1,663%
Osaic Holdings
96
Osaic Holdings
Arizona
$1.13K -$34 -4 -3%
AB
97
Amalgamated Bank
New York
$1K – – –
Simplex Trading
98
Simplex Trading
Illinois
$1K +$1K +137 New
EWA
99
EverSource Wealth Advisors
Alabama
$929 +$929 +108 New
GFM
100
GF Fund Management
China
$893 – – –
2 3
4
5 6