<SEC-DOCUMENT>0001193125-20-139023-index.html : 20200511
<SEC-HEADER>0001193125-20-139023.hdr.sgml : 20200511
<ACCEPTANCE-DATETIME>20200511160505
ACCESSION NUMBER:		0001193125-20-139023
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200511
DATE AS OF CHANGE:		20200511
EFFECTIVENESS DATE:		20200511

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:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36500
		FILM NUMBER:		20864720

	BUSINESS ADDRESS:	
		STREET 1:		7575 GATEWAY BOULEVARD
		STREET 2:		SUITE 110
		CITY:			NEWARK
		STATE:			CA
		ZIP:			94560
		BUSINESS PHONE:		510-293-8800

	MAIL ADDRESS:	
		STREET 1:		7575 GATEWAY BOULEVARD
		STREET 2:		SUITE 110
		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>DEFA14A
<SEQUENCE>1
<FILENAME>d930076ddefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: d930076ddefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g930076g0509081734529.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g930076g0509081734529.jpg

</DOCUMENT>
</SEC-DOCUMENT>