<SEC-DOCUMENT>0000905718-18-000123-index.html : 20180212
<SEC-HEADER>0000905718-18-000123.hdr.sgml : 20180212
<ACCEPTANCE-DATETIME>20180212160909
ACCESSION NUMBER:		0000905718-18-000123
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170719
FILED AS OF DATE:		20180212
DATE AS OF CHANGE:		20180212

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			EMSTER KURT VON
		CENTRAL INDEX KEY:			0001252524

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36500
		FILM NUMBER:		18596435

	MAIL ADDRESS:	
		STREET 1:		601 GATEWAY BOULEVARD
		STREET 2:		SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94080

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CymaBay Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001042074
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				943103561
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		7999 GATEWAY BLVD
		STREET 2:		SUITE 130
		CITY:			NEWARK
		STATE:			CA
		ZIP:			94560
		BUSINESS PHONE:		510-293-8800

	MAIL ADDRESS:	
		STREET 1:		7999 GATEWAY BLVD
		STREET 2:		SUITE 130
		CITY:			NEWARK
		STATE:			CA
		ZIP:			94560

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	METABOLEX, INC.
		DATE OF NAME CHANGE:	20090721

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	METABOLEX INC
		DATE OF NAME CHANGE:	19970710
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>cymabaytherafm4_july192017.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
Document 1 - file: cymabaytherafm4_july192017.html

Document 1 - RAW XML: cymabaytherafm4_july192017.xml

</DOCUMENT>
</SEC-DOCUMENT>