BlackRock, Inc. - Jun 30, 2025 SCHEDULE 13G/A Report for MERSANA THERAPEUTICS INC Common Stock (MRSN)

Filing Manager: BlackRock, Inc.
Reporting Manager: BlackRock, Inc.
Security: MERSANA THERAPEUTICS INC Common Stock
Symbol: MRSN
Shares outstanding: 125M shares
Disclosed Ownership: 3.76M shares
Ownership: 3%
Form type: SCHEDULE 13G/A
Date filed: 7/17/2025, 07:54 PM
Date of event: Jun 30, 2025
Previous filing: Apr 17, 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
BlackRock, Inc.	3%	3.76M	3.74M	0	Spencer Fleming	Managing Director