Mersana Therapeutics, Inc. — Director's Dealing 2017

Jun 28, 2017

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Mersana Therapeutics, Inc. (MRSN)
CIK: 0001442836
Period of Report: 2017-06-27

Reporting Person: Foster Wayne (Vice President of Finance)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	56378	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Option to Purchase Common Stock	$1.62	2024-12-15	Common Stock (1778)		Direct
Option to Purchase Common Stock	$1.53	2025-06-11	Common Stock (20139)		Direct
Option to Purchase Common Stock	$4.10	2026-08-29	Common Stock (11417)		Direct
Option to Purchase Common Stock	$6.98	2027-03-13	Common Stock (13333)		Direct

Footnotes

F1: The original option grant for 3,555 option shares vests in equal quarterly installments over the first four years after the vesting commencement date, January 2, 2015.

F2: The original option grant for 32,222 option shares vests in equal quarterly installments over the first four years after the vesting commencement date, June 12, 2015.

F3: The original option grant for 13,047 option shares vests in equal quarterly installments over the first four years after the vesting commencement date, July 1, 2016.

F4: The options vest in equal quarterly installments over the first four years after the vesting commencement date, March 14, 2017.