Mersana Therapeutics, Inc. — Director's Dealing 2021

Apr 28, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Mersana Therapeutics, Inc. (MRSN)
CIK: 0001442836
Period of Report: 2021-04-26

Reporting Person: Carvajal Alejandra (Chief Legal Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-04-26	Stock Option (right to buy)	$16.98	A	112500	Acquired	2031-04-25	Common Stock (112500)	Direct
2021-04-26	Restricted stock unit	$	A	26500	Acquired		Common Stock (25000)	Direct

Footnotes

F1: The options will vest as to 25% of the shares on the first anniversary of the grant date and in equal quarterly installments over the next three years.

F2: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock upon vesting.

F3: The restricted stock units will vest as to 50% of the shares on the first anniversary of the grant date and 50% of the shares on the second anniversary of the grant date.