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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ( Mark One ) > ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 Form 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Delaware ( State or Other Jurisdiction of Incorporation or Organization ) Or Title of each class Common Stock , par value $ 0.001 per share Commission File Number : 001-36694 PROTARA THERAPEUTICS , INC . ( Exact Name of Registrant as Specified in Its Charter ) Large accelerated filer o Non - accelerated filer x 345 Park Avenue South 3rd Floor New York , NY ( Address of Principal Executive Offices ) 10010 ( Zip Code ) ( 646 ) 844-0337 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : 20-4580525 ( I.R.S. Employer Identification Number ) Trading Symbol ( s ) TARA Name of each exchange on which registered The Nasdaq Capital Market Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes o No x Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934. Yes o No x 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 x No o 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 x No o 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 definitions of " large accelerated filer ” , “ accelerated filer ” , “ smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Securities Exchange Act of 1934 : Accelerated filer o Smaller reporting company x Emerging growth company o