<SEC-DOCUMENT>0001047469-17-003363-index.html : 20170511
<SEC-HEADER>0001047469-17-003363.hdr.sgml : 20170511
<ACCEPTANCE-DATETIME>20170511171228
ACCESSION NUMBER:		0001047469-17-003363
CONFORMED SUBMISSION TYPE:	424B2
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20170511
DATE AS OF CHANGE:		20170511

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:			0630

	FILING VALUES:
		FORM TYPE:		424B2
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-216438
		FILM NUMBER:		17835398

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B2
<SEQUENCE>1
<FILENAME>a2232151z424b2.htm
<DESCRIPTION>424B2
<TEXT>
Document 1 - file: a2232151z424b2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g579169.jpg
<DESCRIPTION>G579169.JPG
<TEXT>
Document 2 - file: g579169.jpg

</DOCUMENT>
</SEC-DOCUMENT>