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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ☐ ANNUAL REPORT PURSUANT TO SECTION 13 OF 15 ( d ) OR THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 Commission File Number 001-39242 CALIFORNIA BANCORP ( Exact name of registrant as specified in its charter ) California ( State or other jurisdiction of incorporation or organization ) Common Stock , No Par Value ( Title of class ) 1300 Clay Street , Suite 500 Oakland , California 94612 ( Address of principal executive offices ) ( 510 ) 457-3737 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : CALB ( Trading Symbol ) 82-1751097 ( I.R.S. Employer Identification No. ) NASDAQ Global Select Market ( Name of exchange on which registered ) NO ☑ Indicate by check mark if the registrant is a well - known seasonal 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 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 □ 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 and post 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 ☐ ☐ Accelerated filer Smaller reporting company 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 has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report.☐ Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . YES □ NO ☑ The aggregate market value of the registrant's common stock held by non - affiliates was approximately $ 111.4 million on June 30 , 2020 based on the closing price per common share of $ 14.90 on that date . Number of shares outstanding of the registrant's common stock as of March 15 , 2021 : 8,184,025 Documents Incorporated by Reference : Portions of the registrant's definitive proxy statement for its 2021 Annual Meeting of Shareholders are incorporated by reference in Part III of this report .