0000899243-21-002549.txt : 20210120 0000899243-21-002549.hdr.sgml : 20210120 20210120190508 ACCESSION NUMBER: 0000899243-21-002549 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20210115 FILED AS OF DATE: 20210120 DATE AS OF CHANGE: 20210120 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Hack Andrew A. F. CENTRAL INDEX KEY: 0001657434 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 21540000 MAIL ADDRESS: STREET 1: 300 THIRD STREET, FIRST FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02142 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 doc4.xml FORM 4 SUBMISSION X0306 4 2021-01-15 0 0001442836 Mersana Therapeutics, Inc. MRSN] 0001657434 Hack Andrew A. F. C/O BAIN CAPITAL LIFE SCIENCES INVESTORS, LLC, 200 CLARENDON STREET BOSTON MA 02116 1 0 0 0 Stock Option (right to buy) 21.09 2021-01-15 4 A 0 2971 0.00 A 2031-01-15 Common Stock 2971 2971 D The option becomes exercisable in equal quarterly installments on the last day of each calendar quarter of 2021. /s/ Andrew A.F. Hack 2021-01-20