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Table of Contents ( Mark One ) ☑ 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF FOR THE QUARTERLY PERIOD ENDED September 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF ☐ 1934 FOR THE TRANSITION PERIOD FROM Commission File Number 001-36500 ΤΟ CymaBay Therapeutics , Inc. ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 7575 Gateway Blvd , Suite 110 Newark , CA ( Address of principal executive offices ) ( 510 ) 293-8800 ( Registrant's telephone number , including area code ) 94-3103561 ( I.R.S. Employer Identification No. ) 94560 ( Zip Code ) Title of each class Securities registered pursuant to Section 12 ( b ) of the Act : Common stock , $ 0.0001 par value per share Trading symbol ( s ) CBAY Name of each exchange on which registered Nasdaq Global Select Market Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ☑ No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ☑ No □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , ” “ smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer ☐ Non - accelerated filer 冈 Accelerated filer ☐ Smaller reporting company ☑ Emerging growth company ☐