EcoR1 Capital, LLC - Dec 19, 2024 SCHEDULE 13G/A Report for Mersana Therapeutics, Inc. Common Stock (MRSN)

Filing Manager
EcoR1 Capital, LLC
Reporting Manager
EcoR1 Capital, LLC
Security
Mersana Therapeutics, Inc. Common Stock
Symbol
MRSN
Shares outstanding
116M shares
Disclosed Ownership
11.6M shares
Ownership
9.99%
Form type
SCHEDULE 13G/A
Date filed
12/23/2024, 07:50 PM
Date of event
Dec 19, 2024
Next filing
May 15, 2025
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
EcoR1 Capital, LLC 9.99% 11.6M 0 11.6M /s/ Oleg Nodelman Manager
Oleg Nodelman 9.99% 11.6M 0 11.6M /s/ Oleg Nodelman Reporting person
EcoR1 Capital Fund Qualified, L.P. 9.4% 10.9M 0 10.9M /s/ Oleg Nodelman Manager of the General Partner, EcoR1 Capital, LLC