DAVID M. MOTT - 08 Jun 2023 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role: Director
Signature: /s/ Alejandra Carvajal, Attorney-in-Fact
Issuer symbol: MRSN
Transactions as of: 08 Jun 2023
Net transactions value: $0
Form type: 4
Filing time: 12 Jun 2023, 16:15:51 UTC
Previous filing: 05 Apr 2023
Next filing: 13 Jun 2023
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MRSN	Common Stock	Award	$0	+14,467	+2.7%	$0.000000	557,932	08 Jun 2023	Direct	F1, F2
holding	MRSN	Common Stock						9,595	08 Jun 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	+18,355		$0.000000	18,355	08 Jun 2023	Common Stock	18,355	$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.