0001104659-21-088909.txt : 20210702 0001104659-21-088909.hdr.sgml : 20210702 20210702163138 ACCESSION NUMBER: 0001104659-21-088909 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20210701 FILED AS OF DATE: 20210702 DATE AS OF CHANGE: 20210702 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Mandelia Ashish CENTRAL INDEX KEY: 0001782805 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 211070644 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 tm2121378d1_4seq1.xml OWNERSHIP DOCUMENT X0306 4 2021-07-01 0 0001442836 Mersana Therapeutics, Inc. MRSN 0001782805 Mandelia Ashish C/O MERSANA THERAPEUTICS, INC. 840 MEMORIAL DRIVE CAMBRIDGE MA 02139 0 1 0 0 VP, Controller Common Stock 2021-07-01 4 S 0 942 13.60 D 0 D Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 11, 2020. These shares were acquired under the Issuer's 2017 Employee Stock Purchase Plan on June 30, 2021. /s/ Brian DeSchuytner, as Attorney-in-Fact 2021-07-02