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 %
PAM
26
Panagora Asset Management
Massachusetts
$128K +$45K +5,231 +55%
Bank of New York Mellon
27
Bank of New York Mellon
New York
$119K – – –
UBS Group
28
UBS Group
Switzerland
$110K +$54.2K +6,301 +97%
Bank of America
29
Bank of America
North Carolina
$108K -$220K -25,583 -67%
Morgan Stanley
30
Morgan Stanley
New York
$106K -$308K -35,849 -74%
SOW
31
State of Wyoming
Wyoming
$102K +$102K +11,820 New
Charles Schwab
32
Charles Schwab
California
$96.6K -$11K -1,280 -10%
Two Sigma Advisers
33
Two Sigma Advisers
New York
$88.9K -$65.3K -7,592 -42%
Cerity Partners
34
Cerity Partners
New York
$84.1K +$84.1K +9,769 New
Susquehanna International Group
35
Susquehanna International Group
Pennsylvania
$83K +$65.8K +7,649 +384%
NL
36
Nuveen LLC
North Carolina
$79.9K +$79.9K +9,289 New
BNP Paribas Financial Markets
37
BNP Paribas Financial Markets
France
$69.3K -$55K -6,388 -44%
AllianceBernstein
38
AllianceBernstein
Tennessee
$64K – – –
Carson Wealth (CWM LLC)
39
Carson Wealth (CWM LLC)
Nebraska
$64K +$63.9K +7,386 +105,514%
Fidelity Investments
40
Fidelity Investments
Massachusetts
$58.9K -$44.1K -5,130 -43%
RhumbLine Advisers
41
RhumbLine Advisers
Massachusetts
$53K -$6.08K -707 -10%
Macquarie Group
42
Macquarie Group
Australia
$52K – – –
AG
43
Algert Global
California
$46K +$25.5K +2,998 +125%
Wealth Enhancement Advisory Services
44
Wealth Enhancement Advisory Services
Minnesota
$45K +$45K +5,228 New
Barclays
45
Barclays
United Kingdom
$41K -$20.5K -2,439 -33%
Invesco
46
Invesco
Georgia
$39.5K +$20.7K +2,400 +109%
SC
47
Savant Capital
Illinois
$38.3K +$38.3K +4,446 New
UOC
48
UBS O'Connor
Illinois
$33.6K -$107K -12,492 -76%
PCA
49
Pallas Capital Advisors
Massachusetts
$32.5K +$32.5K +3,781 New
IIM
50
INTECH Investment Management
Florida
$31.1K +$13.5K +1,573 +77%
1
2
3 4 5