0001209191-17-042067.txt : 20170627 0001209191-17-042067.hdr.sgml : 20170627 20170627215306 ACCESSION NUMBER: 0001209191-17-042067 CONFORMED SUBMISSION TYPE: 3/A PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20170627 FILED AS OF DATE: 20170627 DATE AS OF CHANGE: 20170627 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 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Nayeem Sara M. CENTRAL INDEX KEY: 0001709110 FILING VALUES: FORM TYPE: 3/A SEC ACT: 1934 Act SEC FILE NUMBER: 001-38129 FILM NUMBER: 17933625 MAIL ADDRESS: STREET 1: 5425 WISCONSIN AVENUE STREET 2: SUITE 800 CITY: CHEVY CHASE STATE: MD ZIP: 20815 3/A 1 doc3a.xml FORM 3/A SUBMISSION X0206 3/A 2017-06-27 2017-06-27 1 0001442836 Mersana Therapeutics, Inc. MRSN 0001709110 Nayeem Sara M. 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 1 0 0 0 /s/ Sasha Keough, attorney-in-fact 2017-06-27 EX-24 2 attachment1.htm EX-24 DOCUMENT

POWER OF ATTORNEY
	KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Louis S. Citron, Timothy Schaller, Sasha Keough and Stephanie Brecher,
and each of them, with full power to act without the others, her true and lawful
attorney-in-fact, with full power of substitution, to sign any and all
instruments, certificates and documents that may be necessary, desirable or
appropriate to be executed on behalf of herself as an individual or in her
capacity as a direct or indirect general partner, director, officer or manager
of any partnership, corporation or limited liability company, pursuant to
section 13 or section 16 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act") , and any and all regulations promulgated thereunder, and to
file the same, with all exhibits thereto, and any other documents in connection
therewith, with the Securities and Exchange Commission, and with any other
entity when and if such is mandated by the Exchange Act or by the Financial
Industry Regulatory Authority, granting unto said attorney-in-fact full power
and authority to do and perform each and every act and thing necessary,
desirable or appropriate, fully to all intents and purposes as she might or
could do in person, thereby ratifying and confirming all that said
attorney-in-fact, or his or her substitutes, may lawfully do or cause to be done
by virtue hereof.
	IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 13th day
of March, 2017.

								/s/ Sara M. Nayeem