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Table of Contents Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 [ Mark One ] X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 1934 FORM 10 - K For the Fiscal Year Ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF Delaware ( State of jurisdiction of incorporation or organization ) 355 ambra rcle , Sui 801 Coral Gables , Florida ( Address of principal executive offices ) OR CATALYST PHARMACEUTICALS , INC . ( Exact name of registrant as specified in its charter ) Title of Each Class Common Stock , par value $ 0.001 per share Commission File No. 001-33057 76-0837053 ( IRS Employer Identification No. ) Registrant's telephone number , including area code : ( 305 ) 420-3200 Securities Registered Pursuant to Section 12 ( b ) of the Act . Ticker Symbol CPRX 33134 ( Zip Code ) Securities registered pursuant to Section 12 ( g ) of the Act .: None Name of Exchange on Which Registered NASDAQ Capital Market Indicate by check mark if registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if registrant is not required to file reports pursuant to Rule 13 or Section 15 ( d ) of the Act . Yes 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 No X No X 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 pany . See the definitions of " large accelerated filer " , " accelerated filer " and " smaller reporting company " in Rule 12b - 2 of the Exchange Act : Large accelerated filer Accelerated filer X