<SEC-DOCUMENT>0000902664-22-005295-index.html : 20221227
<SEC-HEADER>0000902664-22-005295.hdr.sgml : 20221227
<ACCEPTANCE-DATETIME>20221227163040
ACCESSION NUMBER:		0000902664-22-005295
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20221227
DATE AS OF CHANGE:		20221227

SUBJECT COMPANY:	

	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:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-40774
		FILM NUMBER:		221490589

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ADAGE CAPITAL PARTNERS GP, L.L.C.
		CENTRAL INDEX KEY:			0001165408
		IRS NUMBER:				043574590
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		200 CLARENDON STREET
		STREET 2:		52ND FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		(617) 867-2800

	MAIL ADDRESS:	
		STREET 1:		200 CLARENDON STREET, 52ND FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ADAGE CAPITAL PARTNERS GP LLC
		DATE OF NAME CHANGE:	20020117
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>p22-2731sc13g.htm
<DESCRIPTION>IMMUNOGEN, INC.
<TEXT>
Document 1 - file: p22-2731sc13g.htm

</DOCUMENT>
</SEC-DOCUMENT>