<SEC-DOCUMENT>0001558370-21-005061-index.html : 20210428
<SEC-HEADER>0001558370-21-005061.hdr.sgml : 20210428
<ACCEPTANCE-DATETIME>20210428160659
ACCESSION NUMBER:		0001558370-21-005061
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20210428
DATE AS OF CHANGE:		20210428

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ImmunoGen, Inc.
		CENTRAL INDEX KEY:			0000855654
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				042726691
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-17999
		FILM NUMBER:		21864251

	BUSINESS ADDRESS:	
		STREET 1:		830 WINTER ST
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		(781)895-0600

	MAIL ADDRESS:	
		STREET 1:		830 WINTER ST
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IMMUNOGEN INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>tmb-20210427xdefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: tmb-20210427xdefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>tmb-20210427xdefa14a001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: tmb-20210427xdefa14a001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>tmb-20210427xdefa14a002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: tmb-20210427xdefa14a002.jpg

</DOCUMENT>
</SEC-DOCUMENT>