DAVID M. MOTT - 09 Jun 2022 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

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	+45,000		$0.000000	45,000	09 Jun 2022	Common Stock	45,000	$3.62	Direct	F1

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

Id	Content
F1	The option will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2023 Annual Meeting of Stockholders of Mersana Therapeutics, Inc., subject to the Reporting Person's continued service on such vesting date.

Exhibit 24 - Power of Attorney