0001104659-22-005548.txt : 20220119 0001104659-22-005548.hdr.sgml : 20220119 20220119180130 ACCESSION NUMBER: 0001104659-22-005548 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20220114 FILED AS OF DATE: 20220119 DATE AS OF CHANGE: 20220119 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Protopapas Anna CENTRAL INDEX KEY: 0001347582 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 22539941 MAIL ADDRESS: STREET 1: MILLENNIUM PHARMACEUTICALS, INC. STREET 2: 40 LANDSDOWNE STREET 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 tm223926-3_4seq1.xml OWNERSHIP DOCUMENT X0306 4 2022-01-14 0 0001442836 Mersana Therapeutics, Inc. MRSN 0001347582 Protopapas Anna C/O MERSANA THERAPEUTICS, INC. 840 MEMORIAL DRIVE CAMBRIDGE MA 02139 1 1 0 0 President & CEO Common Stock 2022-01-14 4 M 0 38958 A 322878 D Restricted Stock Units 2022-01-14 4 M 0 17708 0 D Common Stock 17708 35416 D Restricted Stock Units 2022-01-14 4 M 0 21250 0 D Common Stock 21250 63750 D Stock Option (right to buy) 6.28 2022-01-14 4 A 0 301450 0 A 2032-01-13 Common Stock 301450 301450 D Restricted Stock Units 2022-01-14 4 A 0 67000 0 A Common Stock 67000 67000 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock upon vesting. 50% of the total number of RSUs vested as of January 14, 2022, and thereafter shall vest in equal annual installments over the next two years. 25% of the total number of RSUs vested on January 14, 2022, 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 14, 2022. The restricted stock units vest in equal annual installments over the first four years after the vesting commencement date, January 14, 2022. /s/ Brian DeSchuytner, as Attorney-in-Fact 2022-01-19