<SEC-DOCUMENT>0001193125-18-244510-index.html : 20180809
<SEC-HEADER>0001193125-18-244510.hdr.sgml : 20180809
<ACCEPTANCE-DATETIME>20180809170234
ACCESSION NUMBER:		0001193125-18-244510
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20180809
DATE AS OF CHANGE:		20180809
EFFECTIVENESS DATE:		20180809

FILER:

	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

	FILING VALUES:
		FORM TYPE:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-226741
		FILM NUMBER:		181006185

	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>S-8
<SEQUENCE>1
<FILENAME>d560209ds8.htm
<DESCRIPTION>REGISTRATION STATEMENT ON FORM S-8
<TEXT>
Document 1 - file: d560209ds8.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d560209dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d560209dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>3
<FILENAME>d560209dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 3 - file: d560209dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g560209g0315002708012.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g560209g0315002708012.jpg

</DOCUMENT>
</SEC-DOCUMENT>