Investor Presentaiton

Forward-Looking Statements This presentation may contain certain forward-looking statements that are based on management's current expectations regarding economic, legislative, and regulatory issues that may impact Bancorp's earnings in future periods. Forward-looking statements can be identified by the fact that they do not relate strictly to historical or current facts. They often include the words “believe,” “expect,” “intend,” “estimate” or words of similar meaning, or future or conditional verbs such as "will," "would,” “should,” “could” or “may." Factors that could cause future results to vary materially from current management expectations include, but are not limited to, the businesses of Bank of Marin Bancorp and/or American River Bankshares may not be integrated successfully or such integration may be more difficult, time-consuming or costly than expected; expected revenue synergies and cost savings from the acquisition may not be fully realized or realized within the expected time frame; revenues following the merger may be lower than expected; customer and employee relationships and business operations may be disrupted by the acquisition; the ability to obtain required regulatory and shareholder approvals, and the ability to complete the acquisition on the expected timeframe may be more difficult, time-consuming or costly than expected; natural disasters (such as wildfires and earthquakes), our borrowers' actual payment performance as loan deferrals related to the COVID-19 pandemic expire, changes to statutes, regulations, or regulatory policies or practices as a result of, or in response to COVID-19, including the potential adverse impact of loan modifications and payment deferrals implemented consistent with recent regulatory guidance, general economic conditions, economic uncertainty in the United States and abroad, changes in interest rates, deposit flows, real estate values, costs or effects of acquisitions, competition, changes in accounting principles, policies or guidelines, legislation or regulation (including the Coronavirus Aid, Relief and Economic Security Act of 2020, as amended, and the Economic Aid to Hard-Hit Small Businesses, Nonprofits and Venues Act of 2020), interruptions of utility service in our markets for sustained periods, and other economic, competitive, governmental, regulatory and technological factors (including external fraud and cybersecurity threats) affecting Bancorp's operations, pricing, products and services. These and other important factors are detailed in various securities law filings made periodically by Bancorp, copies of which are available from Bancorp without charge. Bancorp undertakes no obligation to release publicly the result of any revisions to these forward-looking statements that may be made to reflect events or circumstances after the date of this presentation or to reflect the occurrence of unanticipated events. Bank of Marin Bancorp American River Bankshares 2

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