<SEC-DOCUMENT>0000921895-19-002974-index.html : 20191212
<SEC-HEADER>0000921895-19-002974.hdr.sgml : 20191212
<ACCEPTANCE-DATETIME>20191212170415
ACCESSION NUMBER:		0000921895-19-002974
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20191212
DATE AS OF CHANGE:		20191212

SUBJECT COMPANY:	

	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:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-87950
		FILM NUMBER:		191282513

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENGINE CAPITAL, L.P.
		CENTRAL INDEX KEY:			0001580320
		IRS NUMBER:				364755478
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		1370 BROADWAY
		STREET 2:		5TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10018
		BUSINESS PHONE:		(212) 321-0048

	MAIL ADDRESS:	
		STREET 1:		1370 BROADWAY
		STREET 2:		5TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10018

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Engine Capital Management, L.P.
		DATE OF NAME CHANGE:	20180628

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Engine Capital, L.P.
		DATE OF NAME CHANGE:	20130628
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>sc13d09488034_12122019.htm
<DESCRIPTION>THE SCHEDULE 13D
<TEXT>
Document 1 - file: sc13d09488034_12122019.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>ex991to13d09488034_12122019.htm
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
Document 2 - file: ex991to13d09488034_12122019.htm

</DOCUMENT>
</SEC-DOCUMENT>