<SEC-DOCUMENT>0001564590-15-001409-index.html : 20150306
<SEC-HEADER>0001564590-15-001409.hdr.sgml : 20150306
<ACCEPTANCE-DATETIME>20150306171521
ACCESSION NUMBER:		0001564590-15-001409
CONFORMED SUBMISSION TYPE:	10-K/A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20141231
FILED AS OF DATE:		20150306
DATE AS OF CHANGE:		20150306

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Atara Biotherapeutics, Inc.
		CENTRAL INDEX KEY:			0001604464
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				460920988
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		10-K/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36548
		FILM NUMBER:		15682575

	BUSINESS ADDRESS:	
		STREET 1:		3260 BAYSHORE BOULEVARD
		CITY:			BRISBANE
		STATE:			CA
		ZIP:			94005
		BUSINESS PHONE:		415-287-2410

	MAIL ADDRESS:	
		STREET 1:		3260 BAYSHORE BOULEVARD
		CITY:			BRISBANE
		STATE:			CA
		ZIP:			94005
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-K/A
<SEQUENCE>1
<FILENAME>atra-10ka_20141231.htm
<DESCRIPTION>10-K/A
<TEXT>
Document 1 - file: atra-10ka_20141231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-21.1
<SEQUENCE>2
<FILENAME>atra-ex211_201412318.htm
<DESCRIPTION>EX-21.1
<TEXT>
Document 2 - file: atra-ex211_201412318.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>3
<FILENAME>atra-ex311_201412316.htm
<DESCRIPTION>EX-31.1
<TEXT>
Document 3 - file: atra-ex311_201412316.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>4
<FILENAME>atra-ex312_201412317.htm
<DESCRIPTION>EX-31.2
<TEXT>
Document 4 - file: atra-ex312_201412317.htm

</DOCUMENT>
</SEC-DOCUMENT>