EcoR1 Capital, LLC - 19 Dec 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
115,900,370 shares
Disclosed Ownership
11,578,447 shares
Ownership
10%
Form type
SCHEDULE 13G/A
Filing time
23 Dec 2024, 19:50:22 UTC
Date of event
19 Dec 2024
Next filing
15 May 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 10% 11,578,447 0 11,578,447 /s/ Oleg Nodelman Manager
Oleg Nodelman 10% 11,578,447 0 11,578,447 /s/ Oleg Nodelman Reporting person
EcoR1 Capital Fund Qualified, L.P. 9.4% 10,918,474 0 10,918,474 /s/ Oleg Nodelman Manager of the General Partner, EcoR1 Capital, LLC