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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( 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 □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from OR Commission File Number 001-33572 Bank of Marin Bancorp ( Exact name of Registrant as specified in its charter ) California ( State or other jurisdiction of incorporation or organization ) 504 Redwood Blvd. Suite 100 ( Address of principal executive office ) Novato to Title of each class Common Stock , No Par Value , and attached Share Purchase Rights None CA Registrant's telephone number , including area code : ( 415 ) 763-4520 Securities registered pursuant to Section 12 ( b ) of the Act : Securities registered pursuant to section 12 ( g ) of the Act : Trading symbol BMRC 20-8859754 ( IRS Employer Identification No. ) 94947 ( Zip Code ) Name of each exchange on which registered The Nasdaq Stock Market Indicate by check mark if 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 Act . Yes No 区 Note - checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15 ( d ) of the Exchange Act from their obligations under these sections . Indicate by check mark whether the registrant ( 1 ) has filed all reports 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 . No Yes >