<SEC-DOCUMENT>0001485003-21-000045-index.html : 20210315
<SEC-HEADER>0001485003-21-000045.hdr.sgml : 20210315
<ACCEPTANCE-DATETIME>20210315070657
ACCESSION NUMBER:		0001485003-21-000045
CONFORMED SUBMISSION TYPE:	PRE 14A
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20201231
FILED AS OF DATE:		20210315
DATE AS OF CHANGE:		20210315

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:		PRE 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36296
		FILM NUMBER:		21739779

	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>
<DOCUMENT>
<TYPE>PRE 14A
<SEQUENCE>1
<FILENAME>sesn2021proxystatement.htm
<DESCRIPTION>PRE 14A
<TEXT>
Document 1 - file: sesn2021proxystatement.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>image1a.jpg
<TEXT>
Document 2 - file: image1a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>logoa051a.jpg
<TEXT>
Document 3 - file: logoa051a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>sesenbio-proxycard03152021b.jpg
<TEXT>
Document 4 - file: sesenbio-proxycard03152021b.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>sesenbio-proxycard03152021c.jpg
<TEXT>
Document 5 - file: sesenbio-proxycard03152021c.jpg

</DOCUMENT>
</SEC-DOCUMENT>