Mersana Therapeutics, Inc. — Director's Dealing 2021

Jun 23, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Mersana Therapeutics, Inc. (MRSN)
CIK: 0001442836
Period of Report: 2021-06-21

Reporting Person: Lowinger Timothy B (Chief Science & Tech. Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-06-21	Common Stock	M	2	$3.51	Acquired	31446	Direct
2021-06-21	Common Stock	S	2	$13.78	Disposed	31444	Direct
2021-06-21	Common Stock	M	2218	$6.16	Acquired	33662	Direct
2021-06-21	Common Stock	S	2218	$13.78	Disposed	31444	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-06-21	Stock Option (right to buy)	$3.51	M	2	Disposed	2029-01-22	Common Stock (2)	Direct
2021-06-21	Stock Option (right to buy)	$6.16	M	2218	Disposed	2030-01-14	Common Stock (2218)	Direct

Footnotes

F1: Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 12, 2020.

F2: The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 23, 2019.

F3: The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 15, 2020.