0001104659-21-151767.txt : 20211220 0001104659-21-151767.hdr.sgml : 20211220 20211220170116 ACCESSION NUMBER: 0001104659-21-151767 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20211220 FILED AS OF DATE: 20211220 DATE AS OF CHANGE: 20211220 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: 211505934 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 tm2135951-1_4seq1.xml OWNERSHIP DOCUMENT X0306 4 2021-12-20 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 2021-12-20 4 M 0 45593 1.40 A 120766 D Stock Option (right to buy) 1.40 2021-12-20 4 M 0 45593 0 D 2022-10-02 Common Stock 45593 0 D The option vested 25% on October 2, 2013, and in equal quarterly installments thereafter. /s/ Brian DeSchuytner, as Attorney-in-Fact 2021-12-20