<SEC-DOCUMENT>0001654954-21-001681-index.html : 20210216
<SEC-HEADER>0001654954-21-001681.hdr.sgml : 20210216
<ACCEPTANCE-DATETIME>20210216082709
ACCESSION NUMBER:		0001654954-21-001681
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20210216
DATE AS OF CHANGE:		20210216

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMAG PHARMACEUTICALS, INC.
		CENTRAL INDEX KEY:			0000792977
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				042742593
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-38286
		FILM NUMBER:		21632784

	BUSINESS ADDRESS:	
		STREET 1:		1100 WINTER STREET
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		6174983300

	MAIL ADDRESS:	
		STREET 1:		1100 WINTER STREET
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AMAG PHARMACEUTICALS INC.
		DATE OF NAME CHANGE:	20070724

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ADVANCED MAGNETICS INC
		DATE OF NAME CHANGE:	19920703

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Camber Capital Management LP
		CENTRAL INDEX KEY:			0001444043
		IRS NUMBER:				421693587
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		101 HUNTINGTON AVENUE
		STREET 2:		SUITE 2101
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199
		BUSINESS PHONE:		617-717-6600

	MAIL ADDRESS:	
		STREET 1:		101 HUNTINGTON AVENUE
		STREET 2:		SUITE 2101
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02199

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Camber Capital Management LLC
		DATE OF NAME CHANGE:	20080827
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>camberamag-202013ga.htm
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
Document 1 - file: camberamag-202013ga.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1
<SEQUENCE>2
<FILENAME>amag13ga2020ex1.htm
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
Document 2 - file: amag13ga2020ex1.htm

</DOCUMENT>
</SEC-DOCUMENT>