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☑ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31 , 2020 . TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ΤΟ Commission file number : 000-32987 UNITED SECURITY BANCSHARES CALIFORNIA ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) 2126 Inyo Street , Fresno , California ( Address of principal executive offices ) 91-2112732 ( I.R.S. Employer Identification No. ) 93721 ( Zip Code ) Registrant's telephone number , including area code _ ( 559 ) 248-4943 Securities registered pursuant to Section 12 ( b ) of the Act : Common Stock , no par value UBFO ( Title of Class ) ( Trading Symbol ) ( Exchange ) Securities registered pursuant to Section 12 ( g ) of the Act : NONE Nasdaq Indicate by check mark whether the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No ☑ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Securities Act . Yes No 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 for the past 90 days . Yes No □ Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted 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 and post such files ) . Yes | No □ Indicate by check mark if disclosure of delinquent filers pursuant to item 405 of Regulation S - K is not contained herein , and will not be contained , to the best of the registrants knowledge , in the definitive proxy or information statements incorporated by reference in Part III of this form 10 - K or any amendment to this Form 10 - K . □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a small 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 □ Small reporting company ☑ Accelerated filer Non - accelerated filer Emerging growth company □ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . □ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes □ No Aggregate market value of the Common Stock held by non - affiliates as of the last business day of the registrant's most recently completed second fiscal quarter - June 30 , 2020 : $ 89,199,616 Shares outstanding as of February 28 , 2021 : 17,010,288 DOCUMENTS INCORPORATED BY REFERENCE The information required by Items 10 , 11 , 12 , 13 and 14 of Part III of this Annual Report on Form 10 - K will be found in the Company's definitive proxy statement for its 2021 Annual Meeting of Shareholders , to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934 , as amended , and such information is incorporated herein by this reference .