Arvin Yang - 14 Jan 2022 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role: Chief Medical Officer
Signature: /s/ Brian DeSchuytner, as Attorney-in-Fact
Issuer symbol: MRSN
Transactions as of: 14 Jan 2022
Transactions value $: $0
Form type: 4
Filing time: 19 Jan 2022, 16:59:45 UTC
Previous filing: 02 Dec 2021
Next filing: 02 Dec 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	MRSN	Common Stock						12,973	14 Jan 2022	Direct

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	+127,500		$0	127,500	14 Jan 2022	Common Stock	127,500	$6.28	Direct	F1
transaction	MRSN	Restricted Stock Units	Award	$0	+28,333		$0	28,333	14 Jan 2022	Common Stock	28,333		Direct	F2, F3

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

Explanation of Responses:

Id	Content
F1	The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 14, 2022.
F2	Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock upon vesting.
F3	The restricted stock units vest in equal annual installments over the first four years after the vesting commencement date, January 14, 2022.