<SEC-DOCUMENT>0001485003-21-000083-index.html : 20210407
<SEC-HEADER>0001485003-21-000083.hdr.sgml : 20210407
<ACCEPTANCE-DATETIME>20210407080334
ACCESSION NUMBER:		0001485003-21-000083
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		8
FILED AS OF DATE:		20210407
DATE AS OF CHANGE:		20210407

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Sesen Bio, Inc.
		CENTRAL INDEX KEY:			0001485003
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				262025616
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36296
		FILM NUMBER:		21810714

	BUSINESS ADDRESS:	
		STREET 1:		245 FIRST STREET
		STREET 2:		SUITE 1800
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		617-444-8550

	MAIL ADDRESS:	
		STREET 1:		245 FIRST STREET
		STREET 2:		SUITE 1800
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Eleven Biotherapeutics, Inc.
		DATE OF NAME CHANGE:	20100223
</SEC-HEADER>
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<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>defa14a04072021.htm
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<TEXT>
Document 1 - file: defa14a04072021.htm

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<FILENAME>ex991issandglasslewispre001.jpg
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Document 2 - file: ex991issandglasslewispre001.jpg

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<SEQUENCE>3
<FILENAME>ex991issandglasslewispre002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: ex991issandglasslewispre002.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>ex991issandglasslewispre003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: ex991issandglasslewispre003.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>sesnformissandglasslewis001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: sesnformissandglasslewis001.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>sesnformissandglasslewis002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: sesnformissandglasslewis002.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>sesnformissandglasslewis003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: sesnformissandglasslewis003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>sesnformissandglasslewis004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: sesnformissandglasslewis004.jpg

</DOCUMENT>
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