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: Kaufman Michael J. (Sr VP Chmistry, Man & Control)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Option to Purchase Common Stock	$1.89	2026-05-05	Common Stock (154999)		Direct
Option to Purchase Common Stock	$4.10	2026-08-29	Common Stock (16486)		Direct
Option to Purchase Common Stock	$5.00	2026-12-28	Common Stock (27777)		Direct

Footnotes

F1: The options vested 25% on February 26, 2017 and in equal quarterly installments thereafter.

F2: The options vest in equal quarterly installments over the first four years of the vesting commencement date, July 1, 2016.

F3: The options vest in equal quarterly installments over the first four years of the vesting commencement date, January 1, 2017.