0001104659-21-005946.txt : 20210120 0001104659-21-005946.hdr.sgml : 20210120 20210120190350 ACCESSION NUMBER: 0001104659-21-005946 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: Mandelia Ashish CENTRAL INDEX KEY: 0001782805 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 21539989 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 tm211948-7_4seq1.xml OWNERSHIP DOCUMENT X0306 4 2021-01-15 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 2021-01-15 4 M 0 834 A 834 D Common Stock 2021-01-15 4 F 0 289 21.09 D 545 D Common Stock 2021-01-19 4 S 0 545 21.28 D 0 D Restricted Stock Units 2021-01-15 4 M 0 834 0 D Common Stock 834 2499 D Stock Option (right to buy) 21.09 2021-01-15 4 A 0 27115 0 A 2031-01-15 Common Stock 27115 27115 D Restricted Stock Units 2021-01-15 4 A 0 18077 0 A Common Stock 18077 18077 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock upon settlement. Represents the number of shares of common stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the RSUs and does not represent a sale by the reporting person. Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 11, 2020. 25% of the total number of RSUs vested on January 15, 2021, and thereafter shall vest in equal annual installments over the next three years. The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 15, 2021. The RSUs vest in equal annual installments over the first four years after the vesting commencement date, January 15, 2021. /s/ Brian DeSchuytner, as Attorney-in-Fact 2021-01-20