683 Capital Management, LLC - 17 Nov 2025 SCHEDULE 13G Report for Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share (MRSN)

Filing Manager
683 Capital Management, LLC
Reporting Manager
683 Capital Management, LLC
Security
Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share
Symbol
MRSN
Shares outstanding
4,998,537 shares
Disclosed Ownership
273,420 shares
Ownership
5.5%
Form type
SCHEDULE 13G
Filing time
24 Nov 2025, 17:12:46 UTC
Date of event
17 Nov 2025
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
683 Capital Management, LLC 5.5% 273,420 0 273,420 Ari Zweiman Managing Member
683 Capital Partners, LP 5.5% 273,420 0 273,420 Ari Zweiman Authorized Person
Ari Zweiman 5.5% 273,420 0 273,420 Ari Zweiman Self