0001104659-21-084647.txt : 20210623 0001104659-21-084647.hdr.sgml : 20210623 20210623163051 ACCESSION NUMBER: 0001104659-21-084647 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20210621 FILED AS OF DATE: 20210623 DATE AS OF CHANGE: 20210623 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Lowinger Timothy B CENTRAL INDEX KEY: 0001709775 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 211039012 MAIL ADDRESS: STREET 1: 840 MEMORIAL DRIVE CITY: CAMBRIDGE STATE: MA ZIP: 02139 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Mersana Therapeutics, Inc. CENTRAL INDEX KEY: 0001442836 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 840 MEMORIAL DRIVE CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 617-498-0020 MAIL ADDRESS: STREET 1: 840 MEMORIAL DRIVE CITY: CAMBRIDGE STATE: MA ZIP: 02139 FORMER COMPANY: FORMER CONFORMED NAME: MERSANA THERAPEUTICS INC DATE OF NAME CHANGE: 20080813 4 1 tm2120515-1_4seq1.xml OWNERSHIP DOCUMENT X0306 4 2021-06-21 0 0001442836 Mersana Therapeutics, Inc. MRSN 0001709775 Lowinger Timothy B C/O MERSANA THERAPEUTICS, INC. 840 MEMORIAL DRIVE CAMBRIDGE MA 02139 0 1 0 0 Chief Science & Tech. Officer Common Stock 2021-06-21 4 M 0 2 3.51 A 31446 D Common Stock 2021-06-21 4 S 0 2 13.78 D 31444 D Common Stock 2021-06-21 4 M 0 2218 6.16 A 33662 D Common Stock 2021-06-21 4 S 0 2218 13.78 D 31444 D Stock Option (right to buy) 3.51 2021-06-21 4 M 0 2 0 D 2029-01-22 Common Stock 2 12180 D Stock Option (right to buy) 6.16 2021-06-21 4 M 0 2218 0 D 2030-01-14 Common Stock 2218 81647 D Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 12, 2020. The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 23, 2019. The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 15, 2020. /s/ Brian DeSchuytner, as Attorney-in-Fact 2021-06-23