 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether the sale of American River Bankshares NASDAQ: AMRB to Bank of Marin Bancorp is fair to American River shareholders. In connection with the merger, American River shareholders will receive a fixed exchange ratio of 0.575 shares of Bank of Marin common stock for each share of American River common stock outstanding. Halper Sadeh encourages American River shareholders to click here to learn m 