<SEC-DOCUMENT>0001558370-20-003993-index.html : 20200417
<SEC-HEADER>0001558370-20-003993.hdr.sgml : 20200417
<ACCEPTANCE-DATETIME>20200417135025
ACCESSION NUMBER:		0001558370-20-003993
CONFORMED SUBMISSION TYPE:	PRE 14A
PUBLIC DOCUMENT COUNT:		12
CONFORMED PERIOD OF REPORT:	20200617
FILED AS OF DATE:		20200417
DATE AS OF CHANGE:		20200417

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:		PRE 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-17999
		FILM NUMBER:		20798845

	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>PRE 14A
<SEQUENCE>1
<FILENAME>imgn-20200617xpre14a.htm
<DESCRIPTION>PRE 14A
<TEXT>
Document 1 - file: imgn-20200617xpre14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>imgn-20200617xpre14ag001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: imgn-20200617xpre14ag001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>imgn-20200617xpre14ag002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: imgn-20200617xpre14ag002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>imgn-20200617xpre14ag003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: imgn-20200617xpre14ag003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>imgn-20200617xpre14ag004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: imgn-20200617xpre14ag004.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>imgn-20200617xpre14ag005.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: imgn-20200617xpre14ag005.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>imgn-20200617xpre14ag006.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: imgn-20200617xpre14ag006.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>imgn-20200617xpre14ag007.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: imgn-20200617xpre14ag007.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>imgn-20200617xpre14ag008.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: imgn-20200617xpre14ag008.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>imgn-20200617xpre14ag009.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: imgn-20200617xpre14ag009.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>imgn-20200617xpre14ag010.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: imgn-20200617xpre14ag010.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>imgn-20200617xpre14ag011.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: imgn-20200617xpre14ag011.jpg

</DOCUMENT>
</SEC-DOCUMENT>