<SEC-DOCUMENT>0001306923-20-000005-index.html : 20200214
<SEC-HEADER>0001306923-20-000005.hdr.sgml : 20200214
<ACCEPTANCE-DATETIME>20200214133131
ACCESSION NUMBER:		0001306923-20-000005
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200214
DATE AS OF CHANGE:		20200214

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:		20617456

	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:			Palo Alto Investors LP
		CENTRAL INDEX KEY:			0001306923
		IRS NUMBER:				770558164
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		470 UNIVERSITY AVE
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301
		BUSINESS PHONE:		650-325-0772

	MAIL ADDRESS:	
		STREET 1:		470 UNIVERSITY AVE
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Palo Alto Investors, LLC
		DATE OF NAME CHANGE:	20041025
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>AMAG_13G_A11.txt
<TEXT>
Document 1 - file: AMAG_13G_A11.txt

</DOCUMENT>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>2
<FILENAME>AMAG_13G_A11.pdf
<TEXT>
Document 2 - file: AMAG_13G_A11.pdf

</DOCUMENT>
</SEC-DOCUMENT>