 NEW YORK, April 19, 2021 PRNewswire -- WeissLaw LLP is investigating possible breaches of fiduciary duty and other violations of law by the board of directors of American River Bankshares AMRB or the Company NASDAQ: AMRB in connection with the proposed acquisition of the Company by Bank of Marin Bancorp BMRC NASDAQ: BMRC. Under the terms of the merger agreement, AMRB shareholders will receive 0.575 shares of BMRC common stock for each AMRB share that they own, representing implied consideration of approximately 22.46 based upon BMRCs April 16, 2021 closing price of 39.06. 