<SEC-DOCUMENT>0001387131-20-001285-index.html : 20200211
<SEC-HEADER>0001387131-20-001285.hdr.sgml : 20200211
<ACCEPTANCE-DATETIME>20200211132739
ACCESSION NUMBER:		0001387131-20-001285
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20200211
DATE AS OF CHANGE:		20200211
GROUP MEMBERS:		DAVID C. OTT
GROUP MEMBERS:		O. ANDREAS HALVORSEN
GROUP MEMBERS:		ROSE S. SHABET
GROUP MEMBERS:		VIKING GLOBAL OPPORTUNITIES GP LLC
GROUP MEMBERS:		VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP
GROUP MEMBERS:		VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			aTYR PHARMA INC
		CENTRAL INDEX KEY:			0001339970
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				203435077
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-88839
		FILM NUMBER:		20595625

	BUSINESS ADDRESS:	
		STREET 1:		3545 JOHN HOPKINS COURT, STE #250
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		858-731-8389

	MAIL ADDRESS:	
		STREET 1:		3545 JOHN HOPKINS COURT, STE #250
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VIKING GLOBAL INVESTORS LP
		CENTRAL INDEX KEY:			0001103804
		IRS NUMBER:				134055118
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		55 RAILROAD AVENUE
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
		BUSINESS PHONE:		212-672-7050

	MAIL ADDRESS:	
		STREET 1:		55 RAILROAD AVENUE
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>atyr-sc13ga_123119.htm
<DESCRIPTION>AMENDMENT TO FORM SC 13G
<TEXT>
Document 1 - file: atyr-sc13ga_123119.htm

</DOCUMENT>
</SEC-DOCUMENT>