<SEC-DOCUMENT>0001104659-22-052704-index.html : 20220429
<SEC-HEADER>0001104659-22-052704.hdr.sgml : 20220429
<ACCEPTANCE-DATETIME>20220429060735
ACCESSION NUMBER:		0001104659-22-052704
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		8
CONFORMED PERIOD OF REPORT:	20220609
FILED AS OF DATE:		20220429
DATE AS OF CHANGE:		20220429

FILER:

	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

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38129
		FILM NUMBER:		22869848

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>tm223478-2_def14a.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: tm223478-2_def14a.htm

</DOCUMENT>
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<SEQUENCE>2
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<TEXT>
Document 2 - file: lg_mersanathera-4clr.jpg

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<DOCUMENT>
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<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: tm223478d1-bc_ceopay4c.jpg

</DOCUMENT>
<DOCUMENT>
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<SEQUENCE>4
<FILENAME>tm223478d1-bc_expertise4c.jpg
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<TEXT>
Document 4 - file: tm223478d1-bc_expertise4c.jpg

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<SEQUENCE>5
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<TEXT>
Document 5 - file: tm223478d1-icon_crossbw.jpg

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<DOCUMENT>
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<SEQUENCE>6
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<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: tm223478d1-icon_tickbw.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>tm223478d2-px_proxy1pg1bw.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: tm223478d2-px_proxy1pg1bw.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>tm223478d2-px_proxy1pg2bw.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: tm223478d2-px_proxy1pg2bw.jpg

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