<SEC-DOCUMENT>0001558370-17-003049-index.html : 20170428
<SEC-HEADER>0001558370-17-003049.hdr.sgml : 20170428
<ACCEPTANCE-DATETIME>20170428093833
ACCESSION NUMBER:		0001558370-17-003049
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20170428
DATE AS OF CHANGE:		20170428
EFFECTIVENESS DATE:		20170428

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:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-17999
		FILM NUMBER:		17791978

	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>
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<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: defa14a.htm

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Document 2 - file: defa14ag001.gif

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<SEQUENCE>3
<FILENAME>defa14ag002.gif
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<TEXT>
Document 3 - file: defa14ag002.gif

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>defa14ag003.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: defa14ag003.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>defa14ag004.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: defa14ag004.gif

</DOCUMENT>
</SEC-DOCUMENT>