EcoR1 Capital, LLC - Mar 31, 2025 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
Disclosed Ownership: 0 shares
Ownership: 0%
Form type: SCHEDULE 13G/A
Date filed: 5/15/2025, 02:16 PM
Date of event: Mar 31, 2025
Previous filing: Dec 23, 2024
SEC: View on sec.gov

Reporting Managers (3)

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