Mersana Therapeutics, Inc. — Director's Dealing 2025

Jun 13, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Mersana Therapeutics, Inc. (MRSN)
CIK: 0001442836
Period of Report: 2025-06-12

Reporting Person: Hege Kristen (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-06-12	Stock Option (right to buy)	$0.36	A	61500	Acquired	2035-06-11	Common Stock (61500)	Direct

Footnotes

F1: The award will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2026 Annual Meeting of Stockholders of the Issuer, subject to the Reporting Person's continuous service with the Issuer on such vesting date.