0001104659-25-059463.txt : 20250613 0001104659-25-059463.hdr.sgml : 20250613 20250613171512 ACCESSION NUMBER: 0001104659-25-059463 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20250612 FILED AS OF DATE: 20250613 DATE AS OF CHANGE: 20250613 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Alleva Lawrence M CENTRAL INDEX KEY: 0001553053 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 251047688 MAIL ADDRESS: STREET 1: C/O BRIGHT HORIZONS FAMILY SOLUTIONS STREET 2: 2 WELLS AVE CITY: NEWTON STATE: MA ZIP: 02459 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Mersana Therapeutics, Inc. CENTRAL INDEX KEY: 0001442836 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences EIN: 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 tm2517941-6_4seq1.xml OWNERSHIP DOCUMENT X0508 4 2025-06-12 0 0001442836 Mersana Therapeutics, Inc. MRSN 0001553053 Alleva Lawrence M C/O MERSANA THERAPEUTICS, INC. 840 MEMORIAL DRIVE CAMBRIDGE MA 02139 1 0 0 0 0 Stock Option (right to buy) 0.36 2025-06-12 4 A 0 61500 0 A 2035-06-11 Common Stock 61500 61500 D The award will vest in full on the earlier of the first anniversary of the date of grant or the date of the 2026 Annual Meeting of Stockholders of the Issuer, subject to the Reporting Person's continuous service with the Issuer on such vesting date. /s/ Alejandra Carvajal, Attorney-in-Fact 2025-06-13