<SEC-DOCUMENT>0000902664-18-001057-index.html : 20180214
<SEC-HEADER>0000902664-18-001057.hdr.sgml : 20180214
<ACCEPTANCE-DATETIME>20180214102706
ACCESSION NUMBER:		0000902664-18-001057
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180214
DATE AS OF CHANGE:		20180214
GROUP MEMBERS:		PATRICK G. G. DEAR
GROUP MEMBERS:		POLYGON CONVERTIBLE OPPORTUNITY MASTER FUND
GROUP MEMBERS:		POLYGON GLOBAL PARTNERS LLP
GROUP MEMBERS:		POLYGON GLOBAL PARTNERS LP
GROUP MEMBERS:		READE E. GRIFFITH
GROUP MEMBERS:		TFG ASSET MANAGEMENT L.P.

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:			0630

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-40774
		FILM NUMBER:		18608441

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Polygon Management Ltd.
		CENTRAL INDEX KEY:			0001515070
		IRS NUMBER:				980646182
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 309
		STREET 2:		UGLAND HOUSE
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-1104
		BUSINESS PHONE:		212-359-7356

	MAIL ADDRESS:	
		STREET 1:		PO BOX 309
		STREET 2:		UGLAND HOUSE
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-1104
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>p18-0304sc13ga.htm
<DESCRIPTION>IMMUNOGEN, INC.
<TEXT>
Document 1 - file: p18-0304sc13ga.htm

</DOCUMENT>
</SEC-DOCUMENT>