David Mott - Jun 8, 2023 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role: Director
Signature: /s/ Alejandra Carvajal, Attorney-in-Fact
Stock symbol: MRSN
Transactions as of: Jun 8, 2023
Transactions value $: $0
Form type: 4
Date filed: 6/12/2023, 04:15 PM
Previous filing: Apr 5, 2023
Next filing: Jun 13, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MRSN	Common Stock	Award	$0	+14.5K	+2.66%	$0.00	558K	Jun 8, 2023	Direct	F1, F2
holding	MRSN	Common Stock						9.6K	Jun 8, 2023	See Note 3	F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MRSN	Stock Option (right to buy)	Award	$0	+18.4K		$0.00	18.4K	Jun 8, 2023	Common Stock	18.4K	$8.64	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents a restricted stock unit ("RSU") award. Each RSU represents the contingent right to receive one share of Common Stock of the Issuer.
F2	The award will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2024 Annual Meeting of Stockholders of the Issuer, subject to the Reporting Person's continuous service with the Issuer on such vesting date.
F3	The securities are held directly by the Dave Mott Declaration of Trust dated May 31, 2001, as amended (the "Mott Trust"). The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the securities held by the Mott Trust in which the Reporting Person has no pecuniary interest.