Bank of Marin Bancorp and American River Bankshares Announce the Signing of a Merger Agreement - Seite 3

About American River Bankshares

American River Bank is a Sacramento-based community bank serving Northern California since 1983. Headquartered in Rancho Cordova, CA, American River Bank is the wholly owned subsidiary of American River Bankshares (Nasdaq: AMRB). The bank provides a wide range of products and services across 10 branches to mid-sized community-based businesses and individuals located in Sacramento, Amador, Sonoma, and Placer counties. AMRB offers secured and unsecured commercial real estate, secured real estate, and other installment loans as well as personal banking solutions and deposits products. AMRB’s honest approach, commitment to community and focus on profitability is intended to lead their clients to greater success. For more information, go to www.americanriverbank.com/.

Additional Information about the Acquisition and Where to Find It

In connection with the proposed acquisition, BMRC will file with the Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4 to register the shares of BMRC common stock to be issued to the shareholders of AMRB. The registration statement will include a prospectus of BMRC and a joint proxy statement which will be sent to the shareholders of AMRB and BMRC seeking their approval of the acquisition and related matters. In addition, BMRC and AMRB may file other relevant documents concerning the proposed acquisition with the SEC.

Shareholders of BMRC and AMRB are urged to read the registration statement on Form S-4 and the prospectus and joint proxy statement included within the registration statement and any other relevant documents to be filed with the SEC in connection with the proposed acquisition because they will contain important information about BMRC, AMRB and the proposed transaction. Investors and shareholders may obtain free copies of these documents through the website maintained by the SEC at www.sec.gov. Free copies of the joint proxy statement/prospectus also may be obtained by directing a request by telephone or mail to Bank of Marin Bancorp, 504 Redwood Blvd, Suite 100, Novato CA, 94947, Attention: Investor Relations (telephone: [phone]), or by accessing Bank of Marin’s website at www.bankofmarin.com under “Investor Relations.” The information on Bank of Marin’s website is not, and shall not be deemed to be, a part of this release or incorporated into other filings it makes with the SEC.