 NEW YORK, June 10, 2021 PRNewswire -- Juan Monteverde , founder and managing partner at Monteverde Associates PC, a national securities firm rated Top 50 in the 2018-2020 ISS Securities Class Action Services Report and headquartered at the Empire State Building in New York City, is investigating American River Bankshares AMRB or the Company AMRB relating to its proposed merger with Bank of Marin Bancorp. AMRB shareholders will receive 0.575 shares of Bank of Marin common stock per share they own. 