Martin H. Huber Jr. - Oct 2, 2023 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role: President, CEO, Director
Signature: /s/ Alejandra Carvajal, Attorney-in-Fact
Stock symbol: MRSN
Transactions as of: Oct 2, 2023
Transactions value $: $0
Form type: 4
Date filed: 10/4/2023, 04:31 PM
Previous filing: Sep 13, 2023
Next filing: Jan 17, 2024

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	+9.1K		$0.00	9.1K	Oct 2, 2023	Common Stock	9.1K	$1.26	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	This stock option was granted in connection with the Reporting Person's election to receive the Reporting Person's quarterly retainer for non-employee director services in the form of stock options rather than cash. The options were granted to the Reporting Person pursuant to the Issuer's Amended & Restated Non-Employee Director Compensation Policy in lieu of retainer fees of $9,557.69 for service as a non-employee director between July 1, 2023 and September 10, 2023 in the quarter ended September 30, 2023.
F2	Fully vested as of the date of grant.

Content

This stock option was granted in connection with the Reporting Person's election to receive the Reporting Person's quarterly retainer for non-employee director services in the form of stock options rather than cash. The options were granted to the Reporting Person pursuant to the Issuer's Amended & Restated Non-Employee Director Compensation Policy in lieu of retainer fees of $9,557.69 for service as a non-employee director between July 1, 2023 and September 10, 2023 in the quarter ended September 30, 2023.

Fully vested as of the date of grant.