BMRC US Equity☆

ITEM 1A. RISK FACTORS

We assume and manage a certain degree of risk in order to conduct our business. The material risks and uncertainties that management believes may affect our business are listed below and in ITEM 7A, Quantitative and Qualitative Disclosure about Market Risk. The list is not exhaustive; additional risks and uncertainties that management is not aware of, focused on, or currently deems immaterial may also impair business operations. If any of the following risks, or risks that have not been identified, actually occur, our financial condition, results of operations, and stock trading price could be materially and adversely affected. We manage these risks by promoting sound corporate governance practices, which include but are not limited to, establishing policies and internal controls, and implementing internal review processes. Before making an investment decision, investors should carefully consider the risks, together with all of the other information included or incorporated by reference in this Annual Report on Form 10-K and our other filings with the SEC. This report is qualified in its entirety by these risk factors.

Strategic, Financial, and Reputational Risks

Growth Strategy or Potential Mergers and Acquisitions May Produce Unfavorable Outcomes

We seek to expand our franchise safely and consistently. A successful growth strategy requires us to manage multiple aspects of the business simultaneously, such as following adequate loan underwriting standards, balancing loan and deposit growth without compressing our net interest margin, managing interest rate risk, maintaining sufficient capital, and recruiting, training and retaining qualified professionals. Our strategic plan also includes merger and acquisition opportunities that either enhance our market presence or have potential for improved profitability through financial management, economies of scale or expanded services. We may incur significant acquisition related expenses either during the due diligence phase of acquisition targets or during integration of the acquirees. These expenses have and may continue to negatively impact our earnings prior to realizing the benefits of acquisitions. We may also be exposed to difficulties in combining the operations of acquired institutions into our own operations, which may prevent us from achieving the expected benefits from our acquisition activities. Our earnings, financial condition and prospects after the merger may affect our stock price and will depend in part on our ability to integrate the operations and management of the acquired institution while continuing to implement other aspects of our business plan. Inherent uncertainties exist in integrating the operations of an acquired institution and there is no assurance that we will be able to do so successfully. Among the issues that we could face are:

•unexpected problems with operations, personnel, technology or credit;

•loss of customers and employees of the acquiree;

•difficulty in working with the acquiree's employees and customers;

•the assimilation and integration of the acquiree's operations, culture and personnel;

•instituting and maintaining uniform standards, controls, procedures and policies; and

•litigation risk or obligations not discovered during due diligence.

Undiscovered factors as a result of an acquisition could bring liabilities against us, our management and the management of the institutions we acquire. These factors could contribute to our not achieving the expected benefits from our acquisitions within desired time frames, if at all. Further, although we generally anticipate cost savings from acquisitions, we may not be able to fully realize those savings. Any cost savings may be offset by losses in revenues or other charges to earnings.

Competition with Other Financial Institutions to Attract and Retain Banking Customers

We are facing significant competition for customers from other banks and financial institutions located in the markets that we serve. We compete with commercial banks, savings institutions, credit unions, non-bank financial services companies, including financial technology firms, and other financial institutions operating within or near our service areas. Some of our non-bank competitors and peer-to-peer lenders may not be subject to the same extensive regulations as we are, giving them greater flexibility in competing for business. We anticipate intense competition will continue for the coming year due to the market disruptions in banking in 2023, the continued consolidation of many financial institutions and more changes in legislation, regulation and technology. National

13

and regional banks much larger than our size have entered our market through acquisitions and they may be able to benefit from economies of scale through their wider branch networks, more prominent national advertising campaigns, lower cost of borrowing, capital market access and sophisticated technology infrastructures. Further, intense competition for creditworthy borrowers could lead to pressure for loan rate concessions and affect our ability to generate profitable loans.

Going forward, we may see continued competition in the industry as competitors seek to expand market share in our core markets. Further, our customers may withdraw deposits to pursue alternative investment opportunities. Technology and other changes have made it more convenient for bank customers to transfer funds into alternative investments or other deposit platforms such as online virtual banks and non-bank service providers. Efforts and initiatives we may undertake to retain and increase deposits, including deposit pricing, can increase our costs. Based on our current strong liquidity position, our adjustment to deposit pricing has lagged the market in a rising interest rate environment. If our customers move money into higher yielding deposits or alternative investments, we may lose a relatively inexpensive source of funds, thus increasing our funding costs through more expensive wholesale funding sources, such as FHLB borrowings.

Financial Challenges at Other Banking Institutions Could Lead to Depositor Concerns That Spread Within the Banking Industry Causing Disruptive Deposit Outflows and Other Destabilizing Results That Could Adversely Affect Our Liquidity, Business, Financial Condition and Results of Operations

In the first and second quarters of 2023, certain specialized banking institutions with elevated concentrations of uninsured deposits experienced large deposit outflows, resulting in the institutions being placed into FDIC receiverships. In addition, media and market coverage of the Bay Area economy and local financial institutions, have generated significant market volatility among publicly traded bank holding companies and, in particular, regional and community banks like the Company. These market developments have negatively impacted customer confidence in the safety and soundness of regional and community banks and may impact our financial results in future periods. As a result, customers may choose to maintain deposits with larger financial institutions or invest in higher yielding short-term fixed income securities, all of which could materially adversely impact the Company’s liquidity, loan funding capacity, net interest margin, capital and results of operations.

We maintain a well-diversified deposit base, with an estimated 29% of uninsured and/or uncollateralized deposits as of December 31, 2024. Such uninsured deposits were fully covered by the Bank's available funding sources, including unrestricted cash, unencumbered available-for-sale securities, and a total available borrowing capacity of $1.849 billion, or 57% of total deposits, and 197% of estimated uninsured and/or uncollateralized deposits as of December 31, 2024. Excluding zero balance accounts, 59% of deposit balances were held in business accounts with average balances of $127 thousand per account, with the remaining 41% in consumer accounts with average balances of $40 thousand per account as of December 31, 2024.

Although we maintain strong liquidity for the normal operations of the Bank, model various stress scenarios, and maintain significant contingent liquidity sources, general depositor concerns given the recent high profile bank closures could lead to deposit outflows from our Bank. Our funding costs increased significantly in 2023 and could increase again if our deposits decline and we replace them with more expensive sources of funding, such as FHLB and FRB borrowings, and/or brokered deposits, if customers shift their deposits into higher cost products, or if we raise interest rates to avoid losing deposits. In addition, adverse operating results or changes in industry conditions could lead to difficulty or an inability to access these additional funding sources, constraining our financial flexibility, and ability to originate loans, invest in securities, and distribute dividends to our shareholders. In addition, such a lack of liquidity could result in the sale of securities in an unrealized loss position and/or alter our ability to hold our held-to-maturity securities to their maturity dates. All of these factors could have a material adverse impact on our asset growth, liquidity, business, financial condition, and results of operations.

We May Not Be Able to Attract and Retain Key Employees

Our success depends in large part on our ability to attract qualified personnel and to retain key employees, as well as the prompt replacement of retiring executives. The loss of key personnel and/or our inability to secure qualified

14

candidates to replace retiring executives could have an unfavorable effect on our business due to the required skills and knowledge of our market and years of industry experience.

Bancorp Relies on Dividends from the Bank to Pay Cash Dividends to its Shareholders as Well as to Meet Other Financial Obligations

Bancorp is a separate legal entity from its subsidiary, the Bank. Bancorp receives substantially its entire cash stream from the Bank in the form of dividends, which is Bancorp's principal source of funds to pay cash dividends to Bancorp's common shareholders, repurchase shares, and cover operational expenses of the holding company. Various federal and state laws and regulations limit the amount of dividends that the Bank may pay to Bancorp. In the event that the Bank is unable to pay dividends to Bancorp, Bancorp may not be able to pay dividends to its shareholders. As a result, it could have an adverse effect on Bancorp's stock price and investment value.

Federal law would prohibit capital distributions from the Bank, with limited exceptions, if the Bank were categorized as "undercapitalized" under applicable Federal Reserve or FDIC regulations. In addition, as a California bank, Bank of Marin is subject to state law restrictions on the payment of dividends. For further information on the distribution limit from the Bank to Bancorp, see the section captioned “Bank Regulation” in ITEM 1 above and “Dividends” in Note 8 to the Consolidated Financial Statements in ITEM 8 of this report.

The Value of Goodwill and Other Intangible Assets May Decline in the Future

As of December 31, 2024, we had goodwill totaling $72.8 million and a core deposit intangible asset totaling $2.8 million from business acquisitions. A significant decline in expected future cash flows, a significant adverse change in the business climate, or a significant and sustained decline in the price of our common stock could necessitate taking charges in the future related to the impairment of goodwill or other intangible assets. If we were to conclude that a future write-down of goodwill or other intangible assets is necessary, we would record the appropriate charge, which could have a material adverse effect on our business, financial condition and results of operations.

Market, Interest Rate, and Liquidity Risks

A Lack of Liquidity could Adversely Affect our Operations, Financial Condition and Results of Operations

Liquidity is essential to our business and our ability to fund our operations, effectively manage the repayment and maturity schedules of our loans and investment securities, distribute dividends to our shareholders, and fulfill our debt obligations or deposit withdrawal demands. Our most important source of funding consists of deposits, which is affected by external factors outside the Bank's control as well as customers' perceptions, business operations, and investment goals. If customers move money out of bank deposits and into other investments, then we would lose a relatively low-cost source of funds, increasing our funding costs and reducing our net interest income and net income. Based on experience, we believe that our deposit accounts are relatively stable sources of funds.

Other primary sources of funds consist of cash flows from operations, investment maturities and sales, loan repayments, and proceeds from the issuance and sale of any equity and debt securities to investors. Additional liquidity is provided by our ability to borrow from the Federal Reserve Bank of San Francisco, Federal Home Loan Bank and other financial institutions, as well as our ability to raise brokered deposits. Our access to funding sources in amounts adequate to finance or capitalize our activities, or on terms that are acceptable to us, could be impaired by factors that affect us directly or the bank or non-bank financial services industries or the economy in general, such as disruptions in the financial markets or negative views and expectations about the prospects for the bank or non-bank financial services industries.

Earnings are Significantly Influenced by General Business and Economic Conditions

Our success depends, to a certain extent, on local, national and global economic and political conditions. Unlike larger national or other regional banks that are more geographically diversified, we provide banking and financial services to customers primarily in Northern California with particular focus on the local markets in the San Francisco Bay and Greater Sacramento regions. The local economic conditions in these areas have a significant impact on the demand for our products and services as well as the ability of our customers to repay loans, the value of the

15

collateral securing loans and the stability of our deposits as our primary funding source. Economic pressure on consumers and uncertainty regarding the economy and local business climate may result in changes in consumer and business spending, borrowing and saving habits, which may affect the demand for loans and other products and services we offer. Further, loan defaults that adversely affect our earnings correlate highly with deteriorating economic conditions (such as the California unemployment rate and California gross domestic product), which impact our borrowers' creditworthiness. In addition, health epidemics or pandemics (or expectations about them), international trade disputes, inflation risks, oil price volatility, the level of U.S. debt and global economic conditions could destabilize financial markets in which we operate. Lastly, actions of the Federal Open Market Committee ("FOMC") of the Federal Reserve could cause financial market volatility, which will affect the pricing of our loan and deposit products.

Interest Rate Risk is Inherent in Our Business

Our earnings are largely dependent upon our net interest income, which is the difference between interest income earned on interest-earning assets, such as loans and securities, and interest expense paid on interest-bearing liabilities, such as deposits and borrowed funds. Interest rates are sensitive to many factors outside of our control, including general economic conditions and the policies of various governmental and regulatory agencies and, in particular, the FOMC, which regulates the supply of money and credit in the United States. Changes in monetary policy, including changes in interest rates, can influence not only the interest we receive on loans and securities and interest we pay on deposits and borrowings, but can also affect (i) our ability to originate loans and obtain deposits, (ii) the duration of our securities and loan portfolios, and (iii) the fair value of our financial assets and liabilities. In fact, the FOMC’s aggressive interest rate increases, discussed more fully below, negatively affected each of these areas of our business in recent years. Our portfolio of loans and securities will generally decline in value if market interest rates increase, and increase in value if market interest rates decline. Decreases in the market value of investment securities available for sale negatively impact the Bank's tangible equity through accumulated other comprehensive losses. In addition, our loans and callable mortgage-backed securities are also subject to prepayment risk when interest rates fall, and the borrowers' credit risk may increase in rising rate or recessionary environments. Factors such as inflation, productivity, oil prices, unemployment rates, and global demand play a role in the FOMC's consideration of future rate adjustments.

The federal funds rate range remained between 0.0% to 0.25% from March 2020 through the beginning of 2022, putting downward pressure on our asset yields and net interest margin. Beginning in March 2022, the FOMC began successive increases to the federal funds rate due to the evolving inflation risks, complicated by international political unrest and supply chain disruptions. The FOMC began increasing rates in March 2022, totaling seven rate increases in 2022 and four additional rate increases in 2023, and ended the year of 2023 at a federal funds target rate range between 5.25% and 5.50%. Rising interest rates and first quarter 2023 disruptions in the banking industry resulted in rapid increases in the cost of funds through rising deposit costs and increased borrowings, putting pressure on net interest margin starting in the second quarter of 2023.Primarily due to declining inflation, the Federal Reserve lowered the target for the federal funds rate by 100 basis points, to a range of 4.25% to 4.50% in the later months of 2024.

See the Net Interest Income section of Management's Discussion and Analysis of Financial Condition and Results of Operations in ITEM 7 and Quantitative and Qualitative Disclosures about Market Risk in ITEM 7A of this report for further discussion related to interest rate sensitivity and our management of interest rate risk.

Rising Interest Rates Have Decreased the Value of the Company’s Held-To-Maturity and Available-for-Sale Securities Portfolio, and the Company Would Realize Losses if It Were Required to Sell Such Securities to Meet Liquidity Needs

Because of inflationary pressures and the resulting rapid increases in the federal funds target rate since March 2022, the market value of previously issued government and other fixed income securities has declined significantly. These securities make up a majority of the securities portfolio of most banks in the U.S., including the Company’s, resulting in unrealized losses embedded in the held-to-maturity portion of U.S. banks’ securities portfolios and unrealized losses on available-for-sale securities reflected in the Company’s accumulated other comprehensive income (loss). We maintain an investment securities portfolio to provide liquidity and to generate earnings on funds

16

that have not been loaned to customers while managing our liquidity and interest rate position, seeking a reasonable yield balanced with risk exposure. While it is neither our intention to sell securities at a net loss in the normal course of business, nor were we required to, we strategically sold securities in the third and fourth quarters of 2023 and the second quarter of 2024, to reposition the balance sheet to bolster net interest margin. If the Company were to sell additional securities in an unrealized loss position, it may incur losses that could impair the Company’s capital, financial condition, and results of operations and may require the Company to raise additional capital on unfavorable terms, thereby negatively impacting its profitability and potentially causing shareholder dilution.

Activities of Our Large Borrowers and Depositors May Cause Unexpected Volatilities in Our Loan and Deposit Balances, as well as Net Interest Margin

Loans originated at higher interest rates may be paid off and replaced by new loans with lower interest rates, causing downward pressure on our net interest margin. In addition, our top ten depositor relationships accounted for approximately 9% and 8% of total deposit balances at December 31, 2024 and 2023, respectively. The business models and cash cycles of some of our large commercial depositors may also cause short-term volatility in their deposit balances held with us. As our customers' businesses grow, the dollar value of their daily activities may also grow leading to larger fluctuations in daily balances. Any long-term decline in deposit funding would adversely affect our liquidity. For additional information on our management of deposit volatility, refer to the Liquidity section of ITEM 7, Management's Discussion and Analysis, of this report.

Unexpected Early Termination of Interest Rate Swap Agreements May Affect Earnings

We have entered into interest-rate swap agreements, primarily as an asset/liability risk management tool, in order to mitigate the interest rate risk that causes fluctuations in the fair value of specified long-term fixed-rate loans or firm commitments to originate long-term fixed rate loans. In the event of default by the borrowers on our hedged loans, we may have to terminate these designated interest-rate swap agreements early, resulting in market value losses that could negatively affect our earnings.

The Trading Volume of Bancorp's Common Stock May Be Less than That of Other, Larger Financial Services Companies

Our common stock is listed on the Nasdaq Capital Market exchange. Our trading volume is less than that of nationwide or larger regional financial institutions. A public trading market having the desired characteristics of depth, liquidity and orderliness depends on the presence of willing buyers and sellers of common stock at any given time. This presence depends on the individual decisions of investors and general economic and market conditions over which we have no control. Given the low trading volume of our common stock, significant trades of our stock in a given time period, or the expectations of these trades, could cause volatility in the stock price.

Credit Risks

We are Subject to Significant Credit Risk and Loan Losses May Exceed Our Allowance for Credit Losses in the Future

The operation of our business requires us to manage credit risk. As a lender, we are exposed to the risk that our borrowers will be unable to repay their loans according to their terms, and that the collateral securing repayment of their loans, if any, may not be sufficient to ensure repayment. In addition, there are risks inherent in making any loan, including risks with respect to the period of time over which the loan may be repaid, risks relating to proper loan underwriting, risks resulting from changes in economic and industry conditions and risks inherent in dealing with individual borrowers. In order to successfully manage credit risk, we must, among other things, maintain disciplined and prudent underwriting standards and ensure that our bankers follow those standards. The weakening of these standards for any reason, such as an attempt to attract higher yielding loans, a lack of discipline or diligence by our employees in underwriting and monitoring loans, the inability of our employees to adequately adapt policies and procedures to changes in economic or any other conditions affecting borrowers and the quality of our loan portfolio, may result in loan defaults, foreclosures and additional charge-offs and may necessitate that we

17

significantly increase our allowance for credit losses on loans, each of which could adversely affect our net income. As a result, any inability to successfully manage credit risk could have a material adverse effect on our business, financial condition or results of operations.

We maintain allowances for credit losses on loans and unfunded loan commitments that represent management's best estimate of expected credit losses over the contractual lives of our loans under the current expected credit loss method. The level of the allowance reflects management's continuous evaluation of specific credit risks, loan loss experience, current loan portfolio quality and present and forecasted economic, political and regulatory conditions. The determination of the appropriate level of the allowances inherently involves a high degree of subjectivity and requires us to make significant estimates of current credit risks and trends and future economic forecasts, all of which may undergo material changes. Inaccurate assumptions in appraisals or an inappropriate choice of the valuation techniques may lead to an inadequate level of specific reserve or charge-offs.

The Small to Medium-sized Businesses that we Lend to may have Fewer Resources to Weather Adverse Economic and Other Developments, which may Impair a Borrower's Ability to Repay a Loan

We focus our business development and marketing strategy primarily on small to medium-sized businesses. Small to medium-sized businesses frequently have smaller market shares than their competition, may be more vulnerable to economic downturns, often need substantial additional capital to expand or compete and may experience substantial volatility in operating results, any of which may impair a borrower's ability to repay a loan. In addition, the success of a small and medium-sized business often depends on the management talents and efforts of one or two people or a small group of people, and the death, disability or resignation of one or more of these people could adversely affect the business and its ability to repay its loan. If general economic conditions negatively affect the California markets in which we operate and small to medium-sized businesses are adversely affected or our borrowers are otherwise affected by adverse business developments, our business, financial condition and results of operations may be negatively affected.

Negative Conditions Affecting Real Estate May Harm Our Business and Our Commercial Real Estate Concentration May Heighten Such Risk

Concentration of our lending activities in the California real estate sector could negatively affect our results of operations if adverse changes in our lending area occur. As of December 31, 2024, approximately 90% of our loans had real estate as a primary or secondary component of collateral, which were comprised of 72% commercial real estate and 28% residential real estate. Real estate valuations are influenced by demand, and demand is driven by economic factors such as employment rates and interest rates.

Loans secured by CRE include those secured by office buildings, owner-user office/warehouses, mixed-use commercial, retail properties and multi-family residential real estate. There can be no assurance that properties securing our loans will generate sufficient cash flows to allow borrowers to make full and timely loan payments to us. We do not lend on high-rise office towers in San Francisco and the Bay Area generally, but we do take office and other commercial properties as collateral in our CRE lending. For a discussion of our CRE lending, including detail on the types of properties in our real estate secured lending and geographic distribution of such loans, please see the discussion titled “FINANCIAL CONDITION – Loans” herein.

Rising CRE lending concentrations may expose institutions to unanticipated earnings and capital volatility in the event of adverse changes in the CRE market. Concentration risk exists when financial institutions deploy too many assets to any one industry or segment. Concentration stemming from commercial real estate is one area of regulatory concern. The CRE Concentration Guidance provides supervisory criteria, including the following numerical indicators, to assist bank examiners in identifying banks with potentially significant commercial real estate loan concentrations that may warrant greater supervisory scrutiny: (i) total commercial real estate loans exceeding 300% of capital and increasing 50% or more in the preceding three years; or (ii) construction and land development loans exceeding 100% of capital. The CRE Concentration Guidance does not limit banks’ levels of commercial real estate lending activities, but rather guides institutions in developing risk management practices and levels of capital that are commensurate with the level and nature of their commercial real estate concentrations. As of December 31, 2024 and 2023, using regulatory definitions in the CRE Concentration Guidance, our CRE loans represented 389% and 371%, respectively, of our total risk-based capital. We manage our CRE concentrations and

18

discuss them as necessary with the banking regulatory agencies and believe that our underwriting policies, management information systems, independent credit administration process, and monitoring of real estate loan concentrations are currently sufficient to address the CRE Concentration Guidance.

Accounting Estimates and Risk Management Processes Rely on Analytical and Forecasting Models

The processes we use to estimate expected credit losses on loans and investment securities, and to measure the fair value of financial instruments, as well as the processes used to estimate the effects of changing interest rates and other market measures on our financial condition and results of operations, depends upon the use of analytical and forecasting models. These models reflect assumptions that may not be accurate, particularly in times of market volatility or other unforeseen circumstances. Even if these assumptions are adequate, the models may prove to be inadequate or inaccurate because of other flaws in their design or their implementation. If the models we use for interest rate risk and asset-liability management are inadequate, we may incur increased or unexpected losses upon changes in market interest rates or other market factors. If the models we use for determining our expected credit losses on loans and investment securities are inadequate, the allowance for credit losses may not be sufficient to support future charge-offs. If the models we use to measure the fair value of financial instruments are inadequate, the fair value of such financial instruments may fluctuate unexpectedly or may not accurately reflect what we could realize upon sale or settlement of such financial instruments. Any such failure in our analytical or forecasting models could have a material adverse effect on our business, financial condition and results of operations.

Investment Securities May Lose Value due to Credit Quality of the Issuers

We invest in significant portions of debt securities issued by government-sponsored enterprises ("GSE"), such as Federal Home Loan Bank ("FHLB"), Federal National Mortgage Association (“FNMA”), and Federal Home Loan Mortgage Corporation ("FHLMC"). We also hold mortgage-backed securities (“MBS”) issued by FNMA and FHLMC, both of which have been under U.S. government conservatorship since 2008. While we consider FNMA and FHLMC securities to have low credit risk as they carry the explicit backing of the U.S. government due to the conservatorship, they are not direct obligations of the U.S. government. The fair value of our securities issued or guaranteed by these two GSE entities may be negatively impacted if the U.S. government ceases to provide support to the conservatorship. GSE debt is sponsored but not guaranteed by the federal government and carries implicit backing, whereas government agencies such as Government National Mortgage Association ("GNMA") are divisions of the government whose securities are backed by the full faith and credit of the U.S. government.

Although Congress has taken steps to improve regulation and consumer protection related to the housing finance system (e.g., the Dodd-Frank Act), FNMA and FHLMC have entered their 17th year of U.S. government conservatorship via the Federal Housing Finance Agency ("FHFA"). While proposals to end the conservatorship have considered solutions such as an initial public offering, at the date of this report, its future and ultimate impact on the financial markets and our investments in GSEs are uncertain.

While we generally seek to minimize our exposure by strategically diversifying our credit exposure to obligations of issuers in various geographic locations throughout California and the U.S., investing in investment-grade securities, and actively monitoring the creditworthiness of the issuers and/or credit guarantee providers, there is no guarantee that the issuers will remain financially sound or continue their payments on these debentures.

Operational and Other Risks

Risks Associated with Cybersecurity Could Negatively Affect Our Earnings and Reputation

Our business requires the secure management of sensitive client and bank information. We work diligently to implement layered security measures that intend to make our communications and information systems resilient and safe to conduct business. With the advent of artificial intelligence (AI), cyber threats such as social engineering, ransomware, and phishing are more sophisticated and prevalent now than ever before. These incidents include intentional and unintentional events that may present threats designed to disrupt operations, corrupt data, release sensitive information, or cause denial-of-service attacks. A cybersecurity breach of systems operated by the Bank, merchants, vendors, customers, or externally publicized breaches of other financial

19

institutions may significantly harm our reputation, result in a loss of customer business, subject us to regulatory scrutiny, or expose us to civil litigation and financial liability. While we have systems and procedures designed to prevent security breaches, we cannot be certain that advances in cyberthreats, criminal capabilities, network break-ins, or inappropriate access will not compromise or breach the technology protecting our networks or proprietary client information. If a material security breach were to occur, the Bank has policies and procedures in place to ensure timely disclosure. For additional information on cybersecurity management and governance, refer to ITEM-1C, Cybersecurity, in this report.

The Financial Services Industry is Undergoing Rapid Technological Changes and, As a Result, We Have a Continuing Need to Stay Current with Those Changes to Compete Effectively and Increase Our Efficiencies. We May Not Have the Resources to Implement New Technology to Stay Current with These Changes

The financial services industry is undergoing technological changes with frequent introductions of new technology-driven products and services. In addition to providing better client service, the effective use of technology increases efficiency and reduces operational costs. Our future success will depend in part on our ability to use technology to provide products and services that will satisfy client demands securely and cost-effectively. In connection with implementing new technology enhancements and/or products, we may experience operational challenges (e.g., human error, system error, incompatibility), which could result in us not fully realizing the anticipated benefits from such new technology or require us to incur significant costs to remedy any such challenges in a timely manner.

Climate change and related legislative and regulatory initiatives may materially affect the Company’s business and results of operations

Concerns over the long-term impacts of climate change have led to governmental efforts around the world to mitigate those impacts. As a result, political and social attention to the issue of climate change has increased. The U.S. government, state legislatures and federal and state regulatory agencies are likely to continue to propose and advance numerous legislative and regulatory initiatives seeking to mitigate the effects of climate change. These initiatives and increasing supervisory expectations may require the Company to expend significant capital and incur compliance, operating, maintenance and remediation costs. In addition, given the lack of empirical data on the credit and other financial risks posed by climate change, it is impossible to predict how climate change may impact our financial condition and operations. As a banking organization, the physical effects of climate change may present certain unique risks. For example, our primary market is located in both earthquake and wildfire-prone zones in Northern California, which is also subject to other weather or disasters, such as severe rainstorms, drought or flood. These events have interrupted our business operations unexpectedly at times (e.g., PG&E power shutoffs in the North Bay and Sacramento Region). Climate-related physical changes and hazards could also pose credit risks for us. For example, our borrowers may have collateral properties or operations located in areas at risk of wildfires, or coastal areas at risk to rising sea levels and erosion, or subject to the risk of drought in California. The properties pledged as collateral on our loan portfolio could also be damaged by tsunamis, landslides, floods, earthquakes or wildfires and thereby the recoverability of loans could be impaired. A number of factors can affect credit losses, including the extent of damage to the collateral, the extent of damage not covered by insurance, the extent to which unemployment and other economic conditions caused by the natural disaster adversely affect the ability of borrowers to repay their loans, and the cost of collection and foreclosure to us. Additionally, there could be increased insurance premiums and deductibles, or a decrease in the availability of coverage, due to severe weather-related losses. The ultimate outcome on our business of a natural disaster, whether or not caused by climate change, is difficult to predict but could have a material adverse effect on financial condition, results of operations or profitability.

We Rely on Third-Party Vendors for Important Aspects of Our Operation

We depend on the accuracy and completeness of information and systems provided by certain key vendors, including but not limited to data processing, payroll processing, technology support, investment safekeeping and accounting. For example, we outsource core processing to Fidelity Information Services ("FIS") and wire processing to Finastra, which are leading financial services solution providers that allow us access to competitive technology offerings without having to invest in their development. Our ability to operate, as well as our financial condition and results of operations, could be negatively affected in the event of an interruption of an information

20

system, an undetected error, a cyber-breach, or in the event of a natural disaster whereby certain vendors are unable to maintain business continuity.

Regulatory and Compliance Risks

Banks and Bank Holding Companies are Subject to Extensive Government Regulation and Supervision

Bancorp and the Bank are subject to extensive federal and state governmental supervision, regulation and control. Holding company regulations affect the range of activities in which Bancorp is engaged. Banking regulations affect the Bank's lending practices, capital structure, investment practices, dividend policy, and compliance costs among other things. Compliance risk is the current and prospective risk to earnings or capital arising from violations of, or non-conformance with, laws, rules, regulations, prescribed practices, internal policies and procedures, or ethical standards set forth by regulators. Compliance risk also arises in situations where the laws or rules governing certain bank products or activities of our clients may be ambiguous or untested. This risk exposes Bancorp and the Bank to potential fines, civil money penalties, payment of damages and the voiding of contracts. Compliance risk can lead to diminished reputation, reduced franchise value, limited business opportunities, reduced expansion potential and an inability to enforce contracts. The Bank manages these risks through its extensive compliance plan, policies and procedures. For further information on supervision and regulation, see the section captioned “SUPERVISION AND REGULATION” in ITEM 1 of this report.

Significant changes or developments in U.S. laws or policies, and the reactions of the national and global economy to such changes, may have a material adverse effect on our business.

There are uncertainties around the legal and regulatory approach that will be taken under the Trump administration, and we cannot predict the likelihood, nature or extent of changes in law or government regulations that may arise from future legislation or administrative or executive action, either in the United States or abroad.

The current administration’s rapidly evolving policy pronouncements and executive orders create an unpredictable regulatory landscape. This unpredictability can result in sudden changes to the legal and regulatory framework governing our operations, making it challenging to plan and execute our business strategies effectively. Additionally, the potential for abrupt policy shifts may cause fluctuations in market conditions, impacting our investment portfolio, lending activities, and overall financial performance. The general uncertainty associated with the administration’s policy approach may also lead to increased market volatility and disruptions that could affect the availability and cost of capital, the valuation of our assets, the stability of our funding sources, and the financial health and operations of our borrowers. In turn, this may impact our ability to meet regulatory capital requirements, manage liquidity, and maintain profitability.

The administration’s efforts to roll back financial regulations, which may include those established under the Bank Secrecy Act, the Dodd-Frank Wall Street Reform and Consumer Protection Act, and others could lead to changes in the regulatory environment in which we operate. While deregulation may reduce compliance costs and regulatory burdens, it may also increase competition and risk-taking in the financial services sector, potentially leading to greater market volatility and financial instability. We cannot, however, accurately predict the full effects of recent or future legislation or the various other governmental, regulatory, monetary, and fiscal initiatives which have been and may be enacted on the financial markets, the Company, and the Bank.

We continue to monitor regulatory developments and adjust our strategies accordingly. However, the inherent unpredictability of the current regulatory environment poses a risk to our business that could have material adverse effects on our financial condition and results of operations.

Any Regulatory Examination Scrutiny or New Regulatory Requirements Arising From the Recent Events in the Banking Industry Could Increase the Company’s Expenses and Affect the Company’s Operations

The Company could be subject to increased regulatory scrutiny – in the course of routine examinations and otherwise – and new regulations directed towards banks of similar size to the Bank, designed to address the recent

21

negative developments in the banking industry, all of which may increase the Company’s costs of doing business and reduce its profitability.

22

ITEM 1B. UNRESOLVED STAFF COMMENTS

None

ITEM 1C. CYBERSECURITY

Cybersecurity Risk Management, Strategy, and Governance

The Company recognizes that the security of our banking operations is critical to protecting our customers and maintaining our reputation. The cybersecurity landscape is constantly evolving. To mitigate these risks, the Company deploys a comprehensive and resilient information security program that consists of a layered security model using industry leading hardware, software, and services to protect customers' and the Bank’s data and to ensure the confidentiality, integrity, and availability of our information systems. This information security program is a critical component of our overall enterprise risk management program.

The Company leverages the following guidelines and frameworks to continue to refine and maintain the information security program: FFIEC Information Security IT Examination Handbook, FFIEC Business Continuity Planning Handbook, FFIEC Cybersecurity Assessment Tool, Center for Internet Security Critical Security Controls, National Institute of Standards and Technology (NIST) Cybersecurity Framework.

Key components of the information security program include:

•A risk assessment process that identifies and prioritizes material cybersecurity risks; refines and evaluates the effectiveness of controls to mitigate the risks; and reports results to executive management and the Board of Directors.

•A third-party Managed Detection and Response (“MDR”) service, which monitors the security of our network, infrastructure and computer systems 24x7, 365 days a year.

•An incident response plan that outlines the steps the Bank will take to respond to a cybersecurity incident, which is tested on a periodic basis.

•Annual recurring cybersecurity controls testing program, which includes independent third-party penetration testing, cybersecurity procedures and system testing, and third-party independent network traffic monitoring.

•A training and awareness program that educates and tests employees on how to avoid and identify cybersecurity risks.

•A Cyber Security Insurance Policy that covers insurance, incident response, incident mitigation, and legal support.

The Company engages reputable third-party assessors to conduct various independent risk assessments on a regular basis, including but not limited to maturity assessments and various other tests. Following a defense-in-depth strategy, the Company leverages both in-house resources and third-party service providers to implement and maintain processes and controls to manage the identified risks.

Our vendor management program is designed to ensure that our vendors meet our cybersecurity requirements and manage our third-party risks. This includes conducting periodic risk assessments of critical vendors, requiring vendors to implement appropriate cybersecurity controls, and monitoring vendor compliance with our cybersecurity requirements.

Security controls are employed on all media where information is stored, the systems that process it, and infrastructure components that facilitate its transmission to ensure the confidentiality, integrity, and availability of Bank’s and customers' information. These controls include, but are not limited to, access control, data encryption, data loss prevention, incident response, security monitoring, third party risk management, and vulnerability management.

The Company's cybersecurity risk management program and strategy are regularly reviewed and updated to ensure that they are aligned with the Bank's business objectives and are designed to address evolving cybersecurity threats and satisfy regulatory requirements and industry standards.

23

The Company’s Board of Directors is charged with overseeing the establishment and execution of the Company’s risk management framework and monitoring adherence to related policies required by applicable statutes, regulations and principles of safety and soundness. Consistent with this responsibility, the Board has primary oversight of cybersecurity risk and cybersecurity risk management and receives reporting from management about material risks from cybersecurity threats.All members of the Board of Directors receive regular updates on cybersecurity risks and incidents from the Information Security Officer (“ISO”) and Chief Information Officer (“CIO”) and annual security awareness training. The Information Security department consists of cybersecurity professionals who assess, identify, and manage cybersecurity risks and are responsible for implementing and maintaining the Company’s cybersecurity risk management program.

ITEM 2. PROPERTIES

We lease our corporate headquarters building in Novato, California, which houses loan production, operations, Wealth Management and Trust Services and administration. We lease branch and office facilities within our primary market areas in the cities of Corte Madera, San Rafael, Novato, Sausalito, Mill Valley, Greenbrae, Petaluma, Santa Rosa, Healdsburg, Sonoma, Napa, San Francisco, Alameda, Oakland, Walnut Creek, Gold River, Jackson, Roseville, and Sacramento. For additional information on properties, refer to Note 4, Bank Premises and Equipment, and Note 12, Commitments and Contingencies, in ITEM 8 of this report.

ITEM 3. LEGAL PROCEEDINGS

For information on litigation matters, see Note 12, Commitments and Contingencies, in ITEM 8 of this report.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

24

PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information and Holders

Bancorp's common stock trades on the Nasdaq Capital Market under the symbol BMRC. At February 28, 2025, 16,116,627 shares of Bancorp's common stock, no par value, were outstanding and held by approximately 7,500 holders of record and beneficial owners.

Five-Year Stock Price Performance Graph

The following graph, compiled by S&P Global Market Intelligence of New York, New York, shows a comparison of cumulative total shareholder return on our common stock during the five fiscal years ended December 31, 2024 compared to the Russell 2000 Stock index and the S&P Regional Banks Select Industry Index. The comparison assumes the investment of $100 in our common stock on December 31, 2019 and the reinvestment of all dividends. The graph represents past performance and does not indicate future performance. In addition, total return performance results vary depending on the length of the performance period.

Source: S&P Global Market Intelligence

1 The index comprises stocks in the S&P Total Market Index that are classified in the Global Industry Classification Standard regional banks sub-industry.

25

Securities Authorized for Issuance under Equity Compensation Plans

The following table summarizes information as of December 31, 2024, with respect to equity compensation plans.

1 Represents shares of common stock issuable upon exercise of outstanding options under the Bank of Marin Bancorp 2017 Equity Plan and 2007 Equity Plan.

2 Represents remaining shares of common stock available for future grants under the 2017 Equity Plan and the 2020 Director Stock Plan, excluding 273,242 shares to be issued upon exercise of outstanding options and 370,739 shares available to be issued under the Employee Stock Purchase Plan.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

On July 21, 2023, the Board of Directors approved the adoption of Bancorp's share repurchase program for up to $25.0 million and expiring on July 31, 2025. Bancorp repurchased 220,000 shares totaling $4.3 million at an average price of $19.21 per share in the year ended December 31, 2024. There were no repurchases in 2023.

Shares repurchased pursuant to our common stock share repurchase programs during 2024, 2023 and 2022, were as follows.

The following table reports information regarding repurchases of our common stock during the year ended December 31, 2024:

Period

1 Average price paid per share excludes commission.

ITEM 6. [RESERVED]

26

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion of financial condition as of December 31, 2024 and 2023 and results of operations for each of the years in the three-year period ended December 31, 2024 should be read in conjunction with our consolidated financial statements and related notes thereto, included in Part II ITEM 8 of this report.

Forward-Looking Statements

The disclosures set forth in this item are qualified by important factors detailed in Part I captioned Forward-Looking Statements and ITEM 1A captioned Risk Factors of this report and other cautionary statements set forth elsewhere in the report.

Critical Accounting Estimates

Critical accounting estimates are those estimates made in accordance with generally accepted accounting principles that involve a significant level of estimation and uncertainty and have had or are reasonably likely to have a material impact on our financial condition and results of operations. We consider accounting estimates to be critical to our financial results if (i) the accounting estimate requires management to make assumptions about matters that are highly uncertain, (ii) management could have applied different assumptions during the reported period, and (iii) changes in the accounting estimate are reasonably likely to occur in the future and could have a material impact on our financial statements. Management has determined the following accounting estimates and related policies to be critical.

Allowance for Credit Losses on Loans and Unfunded Commitments

The allowance for credit losses on loans is a valuation account that is deducted from the amortized cost basis at the balance sheet date to present the net amount of loans expected to be collected. The allowance for losses on unfunded loan commitments is based on estimates of the probability that these commitments will be drawn upon according to historical utilization experience, expected loss severity, and loss rates as determined for pooled funded loans. The allowance for credit losses on unfunded commitments is a liability account included in interest payable and other liabilities. Management estimates these allowances quarterly using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Credit loss experience among the Bank and peer groups provides the basis for the estimation of expected credit losses.

The allowance for credit losses ("ACL") model utilizes a discounted cash flow ("DCF") method to measure the expected credit losses on loans collectively evaluated that are sub-segmented by loan pools with similar credit risk characteristics, which generally correspond to federal regulatory reporting codes. In addition, the DCF method incorporates assumptions for probability of default ("PD"), loss given default ("LGD"), and prepayments and curtailments over the contractual terms of the loans. Under the DCF method, the ACL reflects the difference between the amortized cost basis and the present value of the expected cash flows using the loan's effective rate.

Management considers whether adjustments to the quantitative portion of the ACL are needed for differences in segment-specific risk characteristics or to reflect the extent to which it expects current conditions and reasonable and supportable forecasts of economic conditions to differ from the conditions that existed during the historical period included in the development of PD and LGD.

Our allowance model is particularly sensitive to forecasted and seasonally-adjusted actual California unemployment rates, which increased to 5.5% at December 31, 2024, from 5.1% at December 31, 2023. The ACL model incorporates a one-year forecast. For periods beyond the forecast horizon, the economic factors revert to historical averages on a straight-line basis over a one-year period through the remaining lives of the loans. We performed a sensitivity analysis as of December 31, 2024, and estimated that a 100 basis point change (e.g., 4.5% to 5.5%) in the forecasted unemployment rates over the next four quarters would result in about a 6% change to our allowance for credit losses on loans. This impact does not consider changes to other assumptions for either the quantitative factors, such as probability of default, loss given default, loan mix or cash flows, prepayment/curtailment rates, and individually analyzed loans, or qualitative factors as discussed in Note 1 - Summary of Significant Accounting

27

Policies. Additionally, because current economic conditions and forecasts can change, as future events are inherently difficult to predict, the estimated credit losses on loans and unfunded commitments could change significantly.

While we believe we use the best information available to determine the allowance for credit losses, our results of operations could be significantly affected if circumstances differ substantially from the assumptions used in determining the allowance. For information regarding critical estimates related to our allowance for credit losses methodology, the provision for credit losses, and risks to asset quality and lending activity, see ITEM 1A - Risk Factors, the Allowance for Credit Losses section in ITEM 7 - Management's Discussion and Analysis of Financial Condition and Results of Operations, and Note 3 - Loans and Allowance for Credit Losses on Loans in ITEM 8 - Financial Statements and Supplementary Data of this Form 10-K.

Fair Value Measurements

We use fair value measurements to record certain financial instruments and to determine fair value disclosures. Available-for-sale securities and interest rate swap agreements are financial instruments recorded at fair value on a recurring basis. Additionally, we record at fair value other financial assets on a nonrecurring basis, such as collateral dependent loans and other real estate owned. These nonrecurring fair value adjustments typically involve write-downs of, or specific reserves against, individual assets. We group our assets and liabilities that are measured at fair value into three levels within the fair value hierarchy, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used in the measurement are observable or unobservable. Observable inputs reflect market-driven or market-based information obtained from independent sources, while unobservable inputs reflect our estimates about market data. The degree of management judgment involved in determining the fair value of a financial instrument is dependent upon the availability of quoted market prices or observable market data. For financial instruments that trade actively and have quoted market prices or observable market data, there is minimal subjectivity involved in measuring fair value. When observable market prices and data are not fully available, management judgment is necessary to estimate fair value. In addition, changes in market conditions may reduce the availability of quoted prices or observable data. Therefore, when market data is not available, we use valuation techniques that require more management judgment to estimate the appropriate fair value measurement. Fair value is discussed further in Note 1 - Summary of Significant Accounting Policies, and Note 9 - Fair Value of Assets and Liabilities in ITEM 8 - Financial Statements and Supplementary Data of this Form 10-K.

28

Goodwill

Goodwill arises from the acquisition method of accounting for business combinations and represents the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill is tested annually for impairment, or more often if conditions change and indicate a possible impairment. Significant judgment is used in the assessment of goodwill, both in a qualitative assessment and a quantitative assessment. Assessments of goodwill often require the use of fair value estimates, which are dependent upon various factors, including estimates concerning the Company’s long-term growth prospects and comparability to industry data. Uncertainty and imprecision in estimates can affect the estimated fair value of the reporting unit in a goodwill assessment. Additionally, various events or circumstances could have a negative effect on the estimated fair value of a reporting unit, such as declines in business performance, increases in credit losses, and deterioration in economic or market conditions, which may result in a material impairment charge to earnings in future periods.

In both 2024 and 2023, the Company assessed goodwill for impairment by performing a quantitative assessment, which encompassed an income approach and two market approaches (peer metrics and recent transactions). The income approach considered such factors as the estimated future cash flows of our reporting unit based on internal long-term forecasts, assumptions concerning potential synergies and other economic benefits, and a discount rate used to present value such cash flows to determine the fair value. The market approach utilized observable market data from comparable public companies, including price-to-tangible book value ratios, to estimate the Company’s fair value. The market approach also incorporated a control premium to represent the Company’s expectation of a hypothetical acquisition. Management used judgment in the selection of comparable companies and included those with similar business activities, and related operating environments. In addition, the selection and weighting of the various fair value techniques may result in higher or lower estimates of fair value. Judgment is applied in determining the weightings between the income approach and the market approach in determining fair value. The results of these assessments indicated the value of goodwill was not impaired as of our annual impairment testing dates of November 30, 2024 and 2023, and there were no changes to our assessment through December 31, 2024.

29

RESULTS OF OPERATIONS

Financial Highlights

The following are highlights of our financial condition and results of operations. The data was derived from the audited consolidated financial statements of Bank of Marin Bancorp.

At December 31,

(dollars in thousands, except per share data) 2024 2023

Selected financial condition data:

Loans, net of allowance for credit losses on loans $ 2,052,600 $ 2,048,548

Borrowings and other obligations $ 154 $ 26,298

Tangible book value per share $ 22.37 $ 22.44

Asset quality ratios:

Allowance for credit losses to total loans 1.47 % 1.21 %

Allowance for credit losses to non-accrual loans 0.90x 3.15x

Non-accrual loans to total loans 1.63 % 0.39 %

Capital ratios:

Tangible common equity to tangible assets 9.93 % 9.73 %

Total capital (to risk-weighted assets) 16.54 % 16.89 %

Tier 1 capital (to risk-weighted assets) 15.32 % 15.91 %

Tier 1 capital (to average assets) 10.46 % 10.46 %

Common equity Tier 1 capital (to risk-weighted assets) 15.32 % 15.91 %

Other data:

Number of branches 27 27

Full-time equivalent employees 285 329

For the Years Ended December 31,

Selected operating data:

Provision for (reversal of) credit losses on loans 5,550 2,575 (63)

Reversal of credit losses on unfunded loan commitments (233) (342) (318)

Net (loss) income per common share:

Performance and other financial ratios:

Return on average assets (0.22) % 0.49 % 1.08 %

Tax-equivalent net interest margin 2.63 % 2.63 % 3.11 %

Net charge-offs (recoveries) $ 66 $ 386 $ (23)

Net charge-offs (recoveries) to average loans NM 0.02 % NM

Cash dividend payout ratio on common stock 1 NM 80.65 % 33.45 %

Cash dividends per common share $ 1.00 $ 1.00 $ 0.98

NM - Not meaningful.

30

Executive Summary

Our annual loss was $8.4 million in 2024, compared to earnings of $19.9 million in 2023. Diluted loss was $(0.52) per share in 2024, compared to earnings of $1.24 per share in 2023.

Results for 2024 were significantly impacted by our strategic balance sheet repositioning which included the sale of $325.2 million in low yielding investment securities at a $32.5 million pre-tax loss, the payoff of high cost borrowings and the purchase and origination of higher yielding loans and securities. In addition, we took actions to reduce operating expenses in 2024 which positively impacted our results later in the year. Though the percentage of non-accrual loans increased from the prior year, we continue to proactively identify and manage credit risk within the loan portfolio and there were some improvements in credit quality trends during the fourth quarter. We believe the strength of our balance sheet, higher level of productivity that we are seeing from our banking teams, and positive trends in our net interest margin and operating leverage are key factors that should help mitigate any unforeseen credit quality deterioration that may arise and drive further improvement in our financial performance in the year ahead.

The following are highlights of operating and financial performance for the year ended December 31, 2024:

•Loans increased $9.5 million during the year ended December 31, 2024, to $2.083 billion, compared to $2.074 billion at December 31, 2023. Excluding a $35.7 million loan pool purchase of residential real estate loans, loan originations totaled $152.6 million for the year ended December 31, 2024, compared to $144.1 million for the prior year.

•Classified loans made up 2.17% of total loans as of December 31, 2024, compared to 1.56% as of December 31, 2023. The Bank continues to proactively identify and manage credit risk within the loan portfolio.

•Non-accrual loans totaled $33.9 million, or 1.63% of the loan portfolio, compared to $8.0 million, or 0.39%, as of December 31, 2024 and 2023, respectively primarily due to three relationships designated as non-accrual in the second and third quarters of 2024. Of the total non-accrual loans as of December 31, 2024, approximately 56% were paying as agreed, 91% were real estate secured, and all are being closely managed and monitored.

•A $5.6 million provision for credit losses on loans in 2024 including a $5.2 million specific reserve taken on a commercial real estate loan as a result of declining collateral values brought the allowance for credit losses to 1.47% of total loans, compared to 1.21% as of December 31, 2023.

•Total deposits decreased by $70.1 million to $3.220 billion as of December 31, 2024, from $3.290 billion as of December 31, 2023. Non-interest bearing deposits continue to remain strong compared to our peers and made up 43.5% of total deposits as of December 31, 2024, compared to 43.8% as of December 31, 2023. We believe we are appropriately competitive in regard to deposit pricing, given our relationship banking model, which differentiates Bank of Marin through exceptional service. Estimated uninsured and/or uncollateralized deposits comprised 29% of total deposits as of December 31, 2024.

•At December 31, 2024, the Bank had no outstanding borrowings compared to $26.0 million at December 31, 2023, as a result of our strategic balance sheet restructuring in 2023 and 2024. Total available funding sources, including unrestricted cash, unencumbered available-for-sale securities, and total available borrowing capacity, were $1.849 billion, or 57% of total deposits and 197% of estimated uninsured and/or uncollateralized deposits as of December 31, 2024.

•The tax-equivalent net interest margin was 2.63% for 2024, consistent with 2023. Higher yields on loans increased the margin by 31 basis points, while higher deposit costs resulted in a 64 basis points reduction in the margin. In addition, the year's balance sheet restructuring activities affected the borrowings, interest-bearing cash and investments factors with impacts of 27, 13 and (7) basis points, respectively.

31

•All capital ratios were above well-capitalized regulatory requirements. Bancorp's total risk-based capital ratio was 16.54% as of December 31, 2024, compared to 16.89% as of December 31, 2023. Tangible common equity to tangible assets ("TCE ratio") increased to 9.93% as of December 31, 2024, from 9.73% as of December 31, 2023. While we do not intend to sell our held-to-maturity securities, the TCE ratio, net of after-tax unrealized losses on held-to-maturity securities as if the losses were realized, was 7.85% as of December 31, 2024 (refer to the discussion and reconciliation of this non-GAAP financial measure in the section below entitled Statement Regarding Use of Non-GAAP Financial Measures).

•The Board of Directors declared a cash dividend of $0.25 per share on January 23, 2025, which was the 79th consecutive quarterly dividend paid by Bancorp. The dividend was paid on February 13, 2025 to shareholders of record at the close of business on February 6, 2025.

32

Net Interest Income

Net interest income is the interest earned on loans, investments and other interest-earning assets minus interest expense incurred on deposits and other interest-bearing liabilities. Net interest income is impacted by changes in general market interest rates and by changes in the composition of interest-earning assets and interest-bearing liabilities. Interest rate changes can create fluctuations in net interest income and/or margin due to an imbalance in the timing of repricing or maturity of assets and liabilities. We manage interest rate risk exposure with the goal of minimizing the impact of interest rate volatility on net interest income.

Net interest margin is expressed as net interest income divided by average interest-earning assets. Net interest rate spread is the difference between the average rate earned on total interest-earning assets and the average rate incurred on total interest-bearing liabilities. Both of these measures are reported on a taxable-equivalent basis. Net interest margin is the higher of the two because it reflects interest income earned on assets funded with non-interest-bearing sources of funds, which include demand deposits and stockholders’ equity.

The following table compares interest income, average interest-earning assets, interest expense, and average interest-bearing liabilities for the periods presented. The table also presents net interest income, net interest margin and net interest rate spread for the years indicated.

Average Statements of Condition and Analysis of Net Interest Income

Year ended Year ended Year ended

Interest Interest Interest

Average Income/ Yield/ Average Income/ Yield/ Average Income/ Yield/

Assets

Liabilities and Stockholders' Equity

Tax-equivalent net interest rate spread 1.39 % 1.67 % 3.03 %

33

Analysis of Changes in Net Interest Income

The following table presents the effects of changes in average balances (volume) or changes in average rates on tax-equivalent net interest income for the years indicated. Volume variances are equal to the increase or decrease in average balances multiplied by prior period rates. Rate variances are equal to the increase or decrease in rates multiplied by prior period average balances. Mix variances are attributable to the change in yields or rates multiplied by the change in average balances including one day more in the year ended 2024.

2024 Compared to 2023

Net interest income totaled $94.7 million in 2024, compared to $102.8 million in 2023. The $8.1 million decrease from the prior year was primarily due to higher deposit costs of $21.2 million, partially offset by the reduction of $11.3 million in borrowing costs.

The tax-equivalent net interest margin was 2.63% for 2024, consistent with 2023. Higher yields on loans increased the margin by 31 basis points, while higher deposit costs resulted in a 64 basis points reduction in the margin. In addition, the year's balance sheet restructuring activities affected the borrowings, interest-bearing cash and investments factors with impacts of 27, 13 and (7) basis points, respectively.

2023 Compared to 2022

Net interest income totaled $102.8 million in 2023, compared to $127.5 million in 2022. The $24.7 million decrease from the prior year was primarily due to higher funding costs of $34.2 million, partially offset by higher average yields on earning assets.

The tax-equivalent net interest margin was 2.63% for 2023, compared to 3.11% for 2022. The decrease was primarily attributed to higher deposit and borrowing costs, partially offset by higher yields on loans and investment securities. Average interest-bearing deposit balances decreased by $115.2 million, while the average rate increased by 133 basis points, decreasing the margin by 58 basis points. Average borrowings and other obligations increased by $219.3 million, while the average cost increased by 125 basis points, decreasing the net interest margin by 29 basis points. Average loan balances decreased by $75.5 million, while the average yield increased by 36 basis points, increasing the margin by 23 basis points. Average investment securities decreased $42.9 million, while their average yield increased 25 basis points, improving the margin by 14 basis points.

Market Interest Rates

Market interest rates are, in part, based on the target federal funds interest rate (the interest rate banks charge each other for short-term borrowings) implemented by the Federal Reserve Open Market Committee ("FOMC").

In response to the evolving risks to economic activity caused by the COVID-19 pandemic, the FOMC made two emergency federal funds rate cuts totaling 150 basis points in March 2020. The federal funds rate range remained between 0.0% and 0.25% through the beginning of 2022, putting downward pressure on our asset yields and net interest margin. The FOMC began increasing rates in March 2022, totaling seven rate increases in 2022 and four

34

additional rate increases in 2023, and ended the year of 2023 at a federal funds target rate range between 5.25% and 5.50%. Rising interest rates resulted in rapid increases in the cost of funds through rising deposit costs and increased average borrowings, putting pressure on our net interest margin. Because market interest rates remained high for longer than many market participants anticipated, during the second quarter of 2024, we sold securities with relatively low yields and redeployed the proceeds to pay off borrowings, invest in higher yielding loans and securities, and position the balance sheet for future acquisitions of similar assets.

Primarily due to declining inflation, the Federal Reserve lowered the target for the federal funds rate by 100 basis points, to a range of 4.25% to 4.50% in the later months of 2024. At the January 2025 meeting, the FOMC left rates unchanged and signaled slower than originally anticipated rate cuts are likely in 2025. Management and the Board are continuously monitoring and analyzing the impact of market rates on the Company's financial condition and results of operations to enhance performance, safety and soundness and returns to shareholders. See ITEM 7A. Quantitative and Qualitative Disclosure about Market Risk for further information.

Provision for Credit Losses on Loans

Management assesses the adequacy of the allowance for credit losses on loans quarterly based on several factors, including growth or contraction of the loan portfolio, past events, current conditions, and reasonable and supportable forecasts to estimate expected losses over the contractual terms of our loans. The allowance for credit losses on loans is increased by provisions charged to expense and loss recoveries and decreased by loans charged off.

The following table shows the activity for the periods presented.

Years ended December 31,

Provision for (reversal of) credit losses on loans $ 5,550 $ 2,575 $ (63)

The provision in 2024 was due primarily to increases in qualitative risk factors to account for continued uncertainty about inflation and recession risks, and from continued negative trends in adversely graded loans and/or collateral values on our non-owner occupied commercial real estate office and multi-family real estate portfolios including $5.2 million taken in the second quarter due to an increased individual reserve for one non-owner occupied commercial real estate loan totaling $16.7 million that, although current, had experienced a deterioration in the collateral value and, therefore, a material increase in the loan-to-value.

The provision in 2023 was due primarily to adjustments to qualitative risk factors from continued uncertainty about inflation and recession risks, the potential impact of rapidly increasing interest rates and other external factors on both our non-owner-occupied commercial real estate and construction portfolios, loan and collateral concentration risks in our construction and commercial real estate portfolios, heightened portfolio management in light of current economic conditions, and continued negative trends in adversely graded loans and/or collateral values for our non-owner occupied commercial real estate office and multi-family real estate portfolios.

The provision reversal in 2022 was largely due to a $55.4 million decrease in applicable loan balances (excludes the $107.7 million decrease in PPP loans for which there was no allowance) and improvements in Moody's Analytics' Baseline Forecast of California unemployment rates since December 31, 2021, which decreased the quantitative "modeled" allowance for credit losses. These decreases were partially offset by adjustments to qualitative risk factors to account for the ongoing deterioration in the economic outlook that management believed was not captured in the quantitative portion of the allowance calculation.

35

Non-interest Income

The table below details the components of non-interest income.

2024 Compared to 2023

Non-interest income showed a loss of $21.4 million for 2024, a $26.3 million decrease from income of $5.0 million for 2023. The decrease in 2024 was primarily due to the $32.5 million net loss on the sale of available-for-sale investment securities in the second quarter related to our balance sheet restructuring. Excluding losses on sale of securities in both years, non-interest income increased by $299 thousand, which included a $275 thousand year-over-year increase in wealth management and trust services income due to increased assets.

2023 Compared to 2022

Non-interest income totaled $5.0 million in 2023, a $5.9 million decrease from $10.9 million in 2022. The decrease in 2023 was primarily due to the $5.9 million net loss on the sale of investment securities mentioned above. Excluding this loss, non-interest income decreased by $86 thousand, which included a $504 thousand decline in deposit network fees earned when deposit balances were brought back on the balance sheet, and a $220 thousand decrease in debit card interchange income. Decreases were partially offset by $573 thousand higher benefit payments from and earnings on bank-owned life insurance, and $209 thousand from increases in dividends on Federal Home Loan Bank stock.

36

Non-interest Expense

The table below details the components of non-interest expense.

Other non-interest expense:

2024 Compared to 2023

Non-interest expenses increased $2.3 million to $81.8 million in 2024 from $79.5 million in 2023. Significant fluctuations were as follows:

•Professional services expenses increased by $1.5 million, mainly from the legal resolution of a Private Attorneys General Act / putative class action lawsuit of $615 thousand and $354 thousand in the new loan operating system platform and implementation costs.

•Salaries and employee benefits increased by $1.2 million primarily due to severance and salaries paid in relation to the reduction in force in the second quarter, the filling of open positions and the hiring of several key employees and officers, higher insurance costs, and lower deferred loan origination costs. Increases to salaries and employee benefits were partially offset by a decrease in profit sharing expense mainly from accrual adjustments, a decrease in accrued incentive bonuses, and a decrease in stock-based compensation from changes in award structure and estimated performance award payouts.

•Deposit network fees increased by $743 thousand due both to rate and volume.

•Depreciation and amortization expenses decreased by $632 thousand, mainly from the acceleration of lease-related costs for four branch closures in 2023.

•Amortization of the core deposit intangible decreased by $375 thousand as the Bank of Alameda amortization completed in 2023.

2023 Compared to 2022

Non-interest expenses increased $4.2 million to $79.5 million in 2023 from $75.3 million in 2022. Significant fluctuations were as follows:

•Deposit network fees increased by $2.5 million as customers sought additional FDIC insurance protection through reciprocal deposit networks.

37

•Salaries and employee benefits increased by $1.4 million primarily due to the filling of open positions and the hiring of several key employees and officers, an increase in SERP-related expenses largely due to new and retired participant adjustments lowering costs for 2022, an increase in deferred officer compensation expense from increased participation and interest rates, higher insurance costs, and lower deferred loan origination costs. Increases to salaries and employee benefits were partially offset by a decrease in profit sharing expense mainly from accrual adjustments and because some contributions in 2023 were made from forfeitures rather than paid in cash, a decrease in accrued incentive bonuses, and a decrease in stock-based compensation from changes in award structure and estimated performance award payout estimates.

•FDIC insurance costs increased by $699 thousand due to an increase in the FDIC statutory assessment rate to strengthen the Deposit Insurance Fund.

•Occupancy and equipment and depreciation and amortization expenses rose by $483 thousand and $258 thousand, respectively, mainly from the acceleration of lease-related costs for branch closures in the first quarter of 2023 and higher maintenance costs.

•Professional services expenses increased by $299 thousand, mainly from consulting fees associated with core systems contract negotiations, systems transformation projects, and internal and external audit costs.

•Information technology and data processing expenses decreased by $628 thousand and $592 thousand, respectively, due to our core system contract renegotiation for the current period and because the prior year included data processing expenses largely eliminated after the systems conversion associated with the American River Bankshares merger.

•Other real estate owned expenses decreased by $311 thousand due to the write-down in 2022 of the property that was then sold in the third quarter of 2023.

Provision for Income Taxes

Income tax provisions reflect accruals for taxes at the applicable rates for federal income tax and California franchise tax based upon reported pre-tax income. Provisions also reflect permanent differences between income for tax and financial reporting purposes (such as earnings on tax exempt loans and municipal securities, bank-owned life insurance ("BOLI"), low-income housing tax credits, and stock-based compensation from the exercise of stock options, disqualifying dispositions of incentive stock options and vesting of restricted stock awards).

The benefit for income taxes totaled $5.4 million at an effective tax rate of 39.2% in 2024, compared to the provision of $6.1 million at an effective tax rate of 23.6% in 2023 and $16.9 million at an effective tax rate of 26.6% in 2022. The reversal in the provision for income taxes in 2024, reflected the impact of the net loss before taxes in the year of $13.8 million compared to net income before taxes of $26.0 million in 2023. The 15.6% increase in the effective tax rate in 2024, as compared to 2023, was due to the treatment of certain permanent differences while in a loss position, such as in 2024. The 300 basis point decrease from 2022 to 2023 was primarily due to a larger proportional effect of permanent tax differences on lower pretax income and higher tax-exempt BOLI income. This decrease was partially offset by a reduction in the tax-exempt interest exclusion (due to a larger IRC Section 291(e) interest expense disallowance), compared to 2022.

We file a consolidated return in the U.S. federal tax jurisdiction and a combined return in the state of California tax jurisdiction. There were no ongoing federal or state income tax examinations at the time of the issuance of this report. As of December 31, 2024 and 2023, neither the Bank nor Bancorp had accruals for interest or penalties related to unrecognized tax benefits.

38

FINANCIAL CONDITION

Investment Securities

We maintain an investment securities portfolio to provide liquidity and generate earnings on funds that have not been loaned to customers. Management determines the maturities and types of securities to be purchased based on liquidity and interest rate risk position, and the desire to attain a reasonable investment yield balanced with risk exposure. The tables below show the composition of the debt securities portfolio by weighted average life at December 31, 2024 and 2023. Weighted average life takes into account the issuer's right to call or prepay obligations, with or without call or prepayment penalties. The weighted average life of the investment portfolio at December 31, 2024 and 2023 was approximately 5.9 and 6.6 years, respectively. The effective duration of the investment portfolio was 4.8 and 5.2 at December 31, 2024 and 2023, respectively.

December 31, 2024 Within 1 Year 1-5 Years 5-10 Years After 10 Years Total

Held-to-maturity:

Available-for-sale:

39

December 31, 2023 Within 1 Year 1-5 Years 5-10 Years After 10 Years Total

Held-to-maturity:

Available-for-sale:

Asset-backed securities — — — — — — — — — — —

1 Book value reflects cost, adjusted for accumulated amortization and accretion.

2 Weighted average calculation is based on amortized cost of securities.

3 Yields on tax-exempt municipal bonds are presented on a taxable equivalent basis, using a federal tax rate of 21%.

The amortized cost of our investment securities portfolio decreased by $240.2 million, or 15.6%, in 2024. In 2024, we sold $325.2 million in available-for-sale securities with an average yield of 1.94%, as part of a balance sheet restructuring, including $190.5 million in agency collateralized mortgage obligations ("CMOs"), $65.0 million in debentures of government sponsored agencies, $39.8 million in agency mortgage-backed securities ("MBSs"), $18.4 million in SBA-backed securities, $6.0 million in corporate bonds and $5.5 million in obligations of state and political subdivisions. The sales of available-for-sale securities generated a net pre-tax loss of $32.5 million.

We consider agency debentures and CMOs issued by U.S. government sponsored entities to have low credit risk as they carry the credit support of the U.S. federal government. The debentures, CMBSs, CMOs and MBS issued by U.S. government sponsored agencies, SBA-backed securities and U.S. Treasury securities made up 85.1% of the portfolio as of December 31, 2024, compared to 86.6% at December 31, 2023. See the discussion in the section captioned “Securities May Lose Value Due to Credit Quality of the Issuers” in ITEM 1A Risk Factors above.

40

At December 31, 2024 and 2023, distribution of our investment in obligations of state and political subdivisions was as follows:

Within California:

Tax allocation bonds — — — — — —

Outside California:

The portion of the portfolio outside the state of California is distributed among twelve states. Of the total investment in obligations of state and political subdivisions, the largest concentrations outside California are in Texas (38.4%), Washington (15.7%), and Wisconsin (9.4%). Our investments in obligations issued by municipal issuers in Texas are either guaranteed by the AAA-rated Texas Permanent School Fund ("PSF"), rated AAA without enhancement, or backed by revenue sources from essential services (such as utilities and transportation).

Investments in states, municipalities and political subdivisions are subject to an initial pre-purchase credit assessment and ongoing monitoring. Key considerations include:

•The soundness of a municipality’s budgetary position and the stability of its tax revenues

•Debt profile and level of unfunded liabilities, diversity of revenue sources, taxing authority of the issuer

•Local demographics and economics including unemployment data, the largest local taxpayers and employers, income indices, and home values

•For revenue bonds, the source and strength of revenue for municipal authorities, including obligors' financial condition and reserve levels, annual debt service and debt coverage ratio, and credit enhancement (such as insurers' strength)

•Credit ratings by major credit rating agencies

Loans

Loans Outstanding by Class and Percent of Total

Real estate

Allowance for credit losses on loans (30,656) (25,172)

Total loans, net of allowance for credit losses $ 2,052,600 $ 2,048,548

41

Loans increased by $9.5 million in 2024, or 0.5%, to $2.083 billion as of December 31, 2024, from $2.074 billion as of December 31, 2023. Organic loan originations were $152.6 million in 2024, compared to $144.1 million in 2023. Loan purchases totaled $35.7 million in 2024, compared to none in the prior year. Non-PPP payoffs were $120.2 million in 2024, compared to $107.1 million in 2023. PPP loan payoffs during 2024 and 2023 were $443 thousand and $2.7 million, respectively. The majority of the payoffs were a result of cash payoffs and asset sales. In addition, $57.4 million of loan amortization from scheduled repayments, net of credit line utilization, contributed to the change in loan balances for 2024. The originations and payoffs noted above, combined with utilization on lines of credit and amortization on existing loans, resulted in a net increase for this period.

Approximately 89% and 90% of total loans were secured by real estate as of December 31, 2024 and 2023, respectively. For additional information on loan concentration risk, see ITEM 1A, Risk Factors.

The following table summarizes our commercial real estate loan concentrations by the county in which the property was located as of December 31, 2024 and 2023.

Commercial Real Estate Loans Outstanding by County

(dollars in thousands; unaudited) December 31, 2024 December 31, 2023

Commercial real estate loans increased by $43.0 million in 2024, compared to a $5.8 million increase in 2023. The increase in 2024 was comprised of the $54.2 million increase within the non-owner occupied loan portfolio, partially offset by the $11.2 million decrease within the owner-occupied loan portfolio. Of the commercial real estate loans as of December 31, 2024, 80% were non-owner occupied and 20% were owner-occupied. Almost the entire commercial real estate loan portfolio is comprised of term loans for which the primary source of repayment is either the cash flow from leasing activities of the real estate collateral or the operating cash flow of the owner occupant.

42

Non-owner and Owner Occupied Real Estate Loans by Type

Multi-family 16 12 — —

Church — — 6 6

Gas/auto — — 8 4

Health club — — 4 2

Commercial Real Estate Loans by Type and County

Non-owner occupied Owner-occupied

(unaudited) Retail Warehouse & industrial Multi-family Office Office

With the heightened market concern about non-owner-occupied commercial real estate, and in particular the office sector, we are providing the following additional information: We continue to maintain diversity among property types and within our geographic footprint. In particular, our office commercial real estate portfolio in the City of San Francisco represents just 3% of our total loan portfolio and 5% of our total non-owner-occupied commercial real estate portfolio.

The following table shows an analysis of construction loans by type and county as of December 31, 2024 and 2023.

Construction Loans Outstanding by Type and County

(dollars in thousands; unaudited) December 31, 2024 December 31, 2023

Land - unimproved — — 1,066 1.0

43

(dollars in thousands; unaudited) December 31, 2024 December 31, 2023

County Amount Percent of Construction Loans Amount Percent of Construction Loans

Construction loans decreased by $62.2 million in 2024, compared to a decrease of $15.2 million in 2023. The decrease in 2024 was primarily due to $44.5 million in conversions to commercial real estate financing following completion of construction and $15.4 million in payoffs. These decreases were partially offset by $11.5 million in new loans and $4.9 million in advances on existing construction loans. The decrease in 2023 was primarily due to $22.2 million in payoffs and $16.9 million in conversions to commercial real estate financing. These decreases were partially offset by $24.5 million in advances on existing construction loans. Undisbursed construction loan commitments at December 31, 2024 and 2023 were $8.3 million and $13.9 million, respectively.

The following table presents the amortized costs and maturity distribution of our loans by portfolio class as of December 31, 2024 based on their contractual maturity dates. Maturities do not include scheduled payments or potential prepayments.

Loan Maturity Distribution

(in thousands; unaudited)

Real estate

1 Construction loans that mature after 5 years are structured to convert to permanent financing after the initial construction period.

The following table shows the mix of variable-rate loans and fixed-rate loans due after one year by portfolio class as of December 31, 2024. The large majority of variable-rate loans are tied to independent indices, such as the Prime Rate or a Treasury Constant Maturity Rate. Most loans with original terms of more than five years have provisions for the fixed rates to reset, or convert to variable rates, after three, five or seven years. These loans are included in the variable-rate balances below.

44

Loan Interest Rate Sensitivity - Due After One Year

(in thousands; unaudited) Fixed Variable Total

Real estate

Allowance for Credit Losses on Loans

The allowance for credit losses on loans is calculated in accordance with ASC 326 based on management's best estimate of current expected credit losses over the loans' contractual terms, adjusted for estimated prepayments where applicable. The contractual terms exclude anticipated extensions, renewals and modifications. Relevant available information includes historical credit loss experience, current conditions and reasonable and supportable forecasts. While historical credit loss experience provides the basis for the estimation of expected credit losses, adjustments to historical loss information may be made for differences in current portfolio-specific risk characteristics, environmental conditions or other relevant factors. All specifically identifiable and quantifiable losses are charged off against the allowance. The ultimate adequacy of the allowance depends on a variety of complex factors, some of which may be beyond management's control, such as volatility in the real estate market, changes in interest rates and economic and political environments. Based on the current conditions of the loan portfolio and reasonable and supportable forecasts, management believes that the $30.7 million allowance for credit losses at December 31, 2024 was adequate to absorb expected credit losses in our loan portfolio. For additional information on our allowance for credit losses methodology, refer to Notes 1 and 3 to the Consolidated Financial Statements in ITEM 8 of this report.

The ratio of the allowance for credit losses to total loans was 1.47% at December 31, 2024 and 1.21% at December 31, 2023.

The $5.5 million increase in the allowance for credit losses on loans in 2024 was largely due to the specific allowance increase of $6.7 million. This was mainly due to the increased reserve of $5.2 million for one non-owner occupied commercial real estate loan totaling $16.7 million that, although current, had experienced a deterioration in the collateral value and, therefore, a material increase in the loan-to-value. For further information, refer to the Provision for Credit Losses section above, and Notes 1 and 3 to the Consolidated Financial Statements in ITEM 8 of this report.

The following table presents the allowance for credit losses on loans by loan portfolio class in accordance with the methodology described in Note 1 to the Consolidated Financial Statements in ITEM 8 of this report, as well as the percentage of total loans in each of the same loan portfolio classes as of December 31, 2024 and 2023.

45

Allocation of the Allowance for Credit Losses

The table below shows the activity in the allowance for credit losses for each of the three years presented below.

Allowance for Credit Losses on Loans Rollforward

Provision for (reversal of) credit losses 5,550 2,575 (63)

Loans charged-off:

Commercial and industrial (41) (11) (9)

Real estate:

Commercial real estate, owner-occupied — (406) —

Installment and other consumer (58) (24) (23)

Total loans charged-off (99) (441) (32)

Loans recovered:

Commercial and industrial 21 29 22

Real estate:

Commercial, non-owner occupied 8 — —

Installment and other consumer 4 1 —

Net loans (charged-off) recovered (66) (386) 23

Net charge-offs (recoveries) to average loans NM 0.02 % NM

NM - Not meaningful.

46

The following table shows non-performing assets as of December 31, 2024 and 2023.

Non-Performing Assets

(dollars in thousands; unaudited) December 31, 2024 December 31, 2023

Non-accrual loans:

Commercial and industrial $ 2,845 $ 4,008

Real estate:

Commercial, owner-occupied 1,537 434

Installment and other consumer 222 —

Other real estate owned $ — $ —

Repossessed personal properties 1 —

Criticized and classified loans:

Doubtful $ — $ —

Allowance for credit losses to non-accrual loans 0.90x 3.15x

Non-accrual loans to total loans 1.63 % 0.39 %

Non-performing assets to total assets 0.92 % 0.21 %

Non-Accrual Loans

Non-accrual loans increased by $25.9 million in 2024, primarily due to three relationships designated as non-accrual in the second and third quarters. One non-owner occupied commercial real estate loan was due to material declines in collateral value, as mentioned in earlier sections. Another was a commercial relationship which had a material paydown in the fourth quarter of 2024. The third relationship was another non-owner occupied commercial real estate loan whose renewal negotiations remain ongoing. This property became 100% occupied with a conforming debt service coverage in the fourth quarter. Approximately 91% of the non-accrual loans as of December 31, 2024 were well-secured by either commercial or residential real estate.

Non-accrual loans in 2023 were comprised of mostly of commercial and industrial and non-owner occupied commercial real estate loans. Over 66% of the non-accrual loans as of December 31, 2023 were well-secured by either commercial or residential real estate.

Criticized and Classified Loans

Loans designated as special mention, which are not considered adversely classified, decreased by $26.3 million in 2024, primarily due to net downgrades of $2.6 million from the pass or watch category and downgrades of $25.0 million to substandard. Of the downgrades to special mention, $15.3 million was attributed to one recently completed construction loan that will be marketed for sale or paid down to a conforming debt service level. The remaining balance changes consisted of paydowns, payoffs and upgrades from substandard risk rating.

Loans designated as special mention, which are not considered adversely classified, increased by $75.0 million in 2023, primarily due to downgrades from the watch category to special mention. The majority of the downgrades from watch to special mention were not necessarily due to worsening conditions or deterioration in the borrowers' financial condition but to a lack of meaningful improvement over the most recent quarters. Of the $92.5 million in downgrades to special mention in 2023, $83.2 million (or 90%) were collateralized by real estate. These increases were partially offset by $7.7 million in paydowns and payoffs, $6.0 million in downgrades from special mention to substandard, and $3.8 million in upgrades to a pass risk rating.

Loans classified as substandard increased by $12.8 million in 2024, primarily due to downgrades from special mention totaling $25.0 million and from pass totaling $2.7 million, partially offset by $11.9 million in paydowns and payoffs and $2.8 million in upgrades to pass or special mention. Of the downgraded loans, $17.1 million (or 82%)

47

was secured by commercial real estate, $3.5 million was to commercial borrowers, and the remaining $222 thousand were personal loans.

Loans classified as substandard increased by $4.2 million in 2023, primarily due to downgrades from special mention totaling $6.0 million and from pass totaling $3.7 million, partially offset by $4.5 million in paydowns and payoffs and $939 thousand in upgrades to pass. Of the downgraded loans, $7.0 million (or 72%) was secured by commercial real estate, and the remaining $2.7 million was to commercial borrowers.

Refer to Note 3 to the Consolidated Financial Statements in ITEM 8 of this report for an allocation of criticized and classified loans by loan portfolio class.

Other Assets

BOLI totaled $71.0 million as of December 31, 2024, compared to $68.1 million at December 31, 2023. The $2.9 million increase was primarily due to the purchase of $1.2 million in new BOLI policies and earnings from the BOLI policies.

Interest receivable and other assets totaled $72.3 million and $74.9 million at December 31, 2024 and 2023, respectively. The $2.7 million decrease was primarily due to a $3.7 million decrease in net deferred tax assets, as discussed below.

Net deferred tax assets totaled $30.6 million and $34.3 million at December 31, 2024 and 2023, respectively. Deferred tax assets consist primarily of tax benefits expected to be realized in future periods related to temporary differences such as allowances for credit losses and unfunded loan commitments, net operating loss carryforwards, and deferred compensation and salary continuation obligations. The $3.7 million decrease in 2024 was primarily due to an $8.4 million decrease in deferred tax assets related to changes in unrealized losses on available-for-sale investment securities. The decreases in net deferred tax assets was partially offset by a $3.2 million increase in deferred tax assets related to net operating loss carryforwards and $1.6 million increase in the allowance for credit losses on loans and unfunded loan commitments. Management believes deferred tax assets will be realizable due to our expectation that earnings will continue to be at a level adequate to realize such tax benefits. Therefore, no valuation allowance was established as of December 31, 2024 or 2023. For additional information, refer to Note 11 to the Consolidated Financial Statements in ITEM 8 of this report.

We held $16.7 million of FHLB stock recorded at cost in other assets at both December 31, 2024 and 2023. We received $1.5 million, $1.3 million and $1.0 million in cash dividends in 2024, 2023 and 2022, respectively. For additional information, refer to Note 2 to the Consolidated Financial Statements in ITEM 8 of this report.

Deposits

Deposits decreased by $70.1 million, to $3.220 billion at December 31, 2024, compared to $3.290 billion at December 31, 2023. Non-interest bearing deposits declined to 43.5% of total deposits at December 31, 2024, compared to 43.8% at December 31, 2023. Deposit outflows included transfers to investment accounts in our wealth management services team and other outflows that did not meet our disciplined pricing strategy given our strong liquidity position. We continued our disciplined and focused approach to relationship management and customer outreach, adding approximately 4,700 new accounts in 2024.

As of December 31, 2024, 59% of deposit balances were held in business accounts, with average balances of $127 thousand per account. The remaining 41% were consumer accounts, with average balances of $40 thousand per account. The largest depositor represented 1.3% of total deposits, and the combined four largest depositors represented 4.8% of total deposits.

Balances in the reciprocal deposit network program decreased by $19.3 million during 2024 to $404.7 million as of December 31, 2024. Costs associated with network deposits are recorded as non-interest expense and totaled $3.5 million, $2.8 million, and $258 thousand for the years ended December 31, 2023, 2022 and 2021, respectively.

Estimated uninsured and/or uncollateralized deposits totaled 29% of total deposits as of December 31, 2024, compared to 28% as of December 31, 2023.

48

Our liquidity policies require that compensating cash balances be held against concentrations over a certain level. See ITEM 1A, Risk Factors, for a discussion of potential risks associated with concentrations and volatility due to the activity of our large deposit customers.

Distribution of Average Deposits

The table below shows the relative composition of our average deposits for 2024 and 2023. For average rates paid on deposits, refer to the Average Statements of Condition and Analysis of Net Interest Income table in ITEM 7- Management's Discussion and Analysis of Financial Condition and Results of Operations.

For the year ended December 31,

1 Money market balances include Insured Cash Sweep® ("ICS") in both 2024 and 2023. Demand Deposit Marketplace SM ("DDM") and ICS balances are discussed in Note 6 to the Consolidated Financial Statements in ITEM 8 of this report.

Maturities of Uninsured Time Deposits

The following table shows time deposits by account that are in excess of $250,000 by time remaining to maturity at December 31, 2024.

(in thousands; unaudited) Total Uninsured Portion

Over six months through twelve months 17,769 8,519

Network Deposits

Our deposit portfolio includes deposits offered through the Promontory Interfinancial Network that are comprised of Certificate of Deposit Account Registry Service® ("CDARS") balances included in time deposits and Insured Cash Sweep® ("ICS") balances included in money market deposits. In addition, we offer deposits through Reich & Tang Deposit Networks, LLC, comprised of Demand Deposit MarketplaceSM ("DDM") balances. Through these two networks we are able to offer our customers access to FDIC-insured deposit products in aggregate amounts exceeding current insurance limits. When we place funds through CDARS,ICS and DDM, on behalf of a customer, we have the option of receiving matching deposits through the network's reciprocal deposit program, or placing deposits "one-way" for which we receive no matching deposits. We consider reciprocal deposits to be in-market deposits, as distinguished from traditional out-of-market brokered deposits. The following table shows the composition of our network deposits at December 31, 2024 and 2023.

Reciprocal 1 One-Way 1 Reciprocal 1 One-Way 1

Borrowings

49

As of December 31, 2024 and 2023, our borrowing capacity with the Federal Home Loan Bank ("FHLB") under secured lines of credit totaled $948.1 million and $1.009 billion, respectively.

The Bank had a line of credit through the Discount Window at the Federal Reserve Bank of San Francisco ("FRBSF") totaling $358.0 million as of December 31, 2024, secured by investment securities and residential loans. As of December 31, 2023, the Bank had a line of credit through the Discount Window totaling $64.0 million, secured by residential loans, and a $270.2 million line under the Federal Reserve's temporary Bank Term Funding Program ("BTFP") based on the par values of pledged investment securities.

In addition, as of December 31, 2024 and 2023 we had $125.0 million and $135.0 million, respectively, in unsecured lines of credit with correspondent banks to cover short-term borrowing needs.

As of December 31, 2024, the Bank had no outstanding borrowings, compared to $26.0 million outstanding in short-term borrowings under the BTFP facility at an average rate of 4.83% as of December 31, 2023. Other bank lines of credit were not utilized as of December 31, 2024 or 2023.

For additional information, see Note 7, Borrowings and Other Obligations, in ITEM 8 of this report.

Deferred Compensation Obligations

We maintain a non-qualified, unfunded deferred compensation plan for certain key management personnel. Under this plan, participating employees may defer compensation, which will entitle them to receive certain payments for up to, but not exceeding, fifteen years commencing upon retirement, death, disability or termination of employment. A similar Deferred Director Fee Plan entitles participating members of the Board of Directors to receive payments as elected by the participant upon separation from service, death, disability or termination of service. At December 31, 2024 and 2023, our aggregate payment obligations under both plans totaled $6.0 million and $6.6 million, respectively, and was recorded in interest payable and other liabilities in the consolidated statements of condition. Decreases in the deferred compensation plans in 2024 mainly resulted from increases in benefit payments to terminated employees.

We have entered into supplemental executive retirement plans ("SERPs") with a select group of executive officers, providing for certain retirement benefits at age 65 and reduced benefits upon early retirement. The annual amount of benefits in either pre-retirement scenario is based on a vesting schedule unique to each executive. The SERP also provides for lump sum benefits in the event of a change in control followed by the termination of the executive. Payments under the SERPs are expected to be funded by income from bank-owned life insurance policies. On December 31, 2024 and 2023, our liabilities under the SERPs totaled $4.6 million and $4.5 million, respectively, and were recorded in interest payable and other liabilities in the consolidated statements of condition. The SERPs are unfunded and non-qualified for tax purposes and subject to Title I of the Employee Retirement Income Security Act of 1974.

For additional information, see Note 10 to the Consolidated Financial Statements in ITEM 8 of this report.

Capital Adequacy

As discussed in Note 15 to the Consolidated Financial Statements in ITEM 8 of this report, the Bank's capital ratios were above regulatory guidelines to be considered "well capitalized" and Bancorp's ratios exceeded the required minimum ratios for capital adequacy purposes. For further discussion of bank capital requirements, refer to the SUPERVISION AND REGULATION section in ITEM 1 of this report.

The total risk-based capital ratio for Bancorp was16.54% at December 31, 2024, compared to 16.89% at December 31, 2023. The reduction is primarily related to losses realized on securities sales in 2024.

50

Bancorp's tangible common equity to tangible assets ("TCE ratio") increased to 9.93% at December 31, 2024, from 9.73% at December 31, 2023, primarily due to due to the reduction in total assets. Bancorp's TCE ratio, net of after-tax unrealized losses on held-to-maturity securities as if the losses were realized, was 7.85% as of December 31, 2024, compared to 7.80% at December 31, 2023 (refer to the discussion and reconciliation of this non-GAAP financial measure in the section below entitled Statement Regarding Use of Non-GAAP Financial Measures). The Bank's total risk-based capital ratio decreased to 16.13% at December 31, 2024, from 16.62% at December 31, 2023.

Bancorp's share repurchase program and activity are discussed in detail in ITEM 5 and in Note 8 to the Consolidated Financial Statements in ITEM 8 of this report. We expect to maintain strong capital levels and do not expect that we will be required to raise additional capital in 2025. Our anticipated sources of capital in 2025 include future earnings and shares issued under the stock-based compensation program.

Liquidity and Capital Resources

The goal of liquidity management is to provide adequate funds to meet loan demand and to fund operating activities and deposit withdrawals. We accomplish this goal by maintaining an appropriate level of liquid assets and formal lines of credit with the FHLB, FRBSF and correspondent banks that enable us to borrow funds as seen in the table below and discussed in Note 7 to the Consolidated Financial Statements in ITEM 8 of this report. Our Asset Liability Management Committee ("ALCO"), which is comprised of Bank directors and the Bank's Chief Executive Officer, is responsible for approving and monitoring our liquidity targets and strategies. The Bank has long-established minimum liquidity requirements that are regularly monitored using metrics and tools similar to those used by larger banks, such as the liquidity coverage ratio, and multi-scenario, long-horizon stress tests. Our contingency funding plan provides for early detection of potential liquidity issues in the market or the Bank and institutes prompt responses that may prevent or alleviate a liquidity crisis. Management monitors liquidity daily and regularly adjusts our position based on current and future liquidity needs. We also have relationships with third-party deposit networks and can adjust the placement of our deposits via reciprocal or one-way sales as part of our cash management strategy, as discussed in Note 6 to the Consolidated Financial Statements in ITEM 8 of this report.

Net available funding sources, including unrestricted cash, unencumbered available-for-sale securities, and total available borrowing capacity, totaled $1.849 billion, or 57% of total deposits, and 197% of estimated uninsured and/or uncollateralized deposits as of December 31, 2024.

The following table details the components of our contingent liquidity sources as of December 31, 2024.

(in thousands) Total Available Amount Used Net Availability

Internal Sources

External Sources

Lines of credit at correspondent banks 125,000 — 125

1 Excludes cash items in transit as of December 31, 2024.

Note: Brokered deposits available through third-party networks are not included above.

We obtain funds from the repayment and maturity of loans, deposit inflows, investment securities sales, maturities and paydowns, federal funds purchases, FRBSF and FHLB advances, other borrowings, and cash flow from operations. Although available as a liquidity source, we have not chosen to utilize brokered deposits. Our primary uses of funds are the origination of loans, the purchase of investment securities and loans, withdrawals of deposits, maturities of certificates of deposit, repayment of borrowings, dividends to common stockholders, share repurchases and operating expenses.

Customer deposits are a significant component of our daily liquidity position. The attraction and retention of deposits depend upon the variety and effectiveness of our customer account products, service and convenience, rates paid to customers, and our financial strength. The cash cycles and unique business activities of some of our large commercial depositors may cause short-term fluctuations in their deposit balances held with us.

51

Our cash and cash equivalents increased by $106.9 million to $137.3 million at December 31, 2024, from $30.5 million at December 31, 2023. The most significant sources of liquidity during 2024 were proceeds from sales, principal paydowns, calls and maturities of investment securities totaling $370.4 million, and $28.4 million in net cash was provided by operating activities.

Significant uses of liquidity during 2024 were $163.8 million in investment securities purchased, $70.1 million in withdrawals of deposits, $26.0 million in repayments of short-term borrowings, and $9.7 million in purchased loan pool, loan originations, and unfunded loan commitment advances, net of principal collected. Additionally other uses included $16.2 million in cash dividends paid on common stock to our shareholders, and $4.2 million in common stock repurchases. Refer to the Consolidated Statement of Cash Flows in this Form 10-K for additional information on our sources and uses of liquidity. Management anticipates that our current strong liquidity position, as detailed in this report, and contingent funding sources are adequate to support our operational needs.

Unfunded credit commitments, as discussed in Note 16 to the Consolidated Financial Statements in ITEM 8 of this report, totaled $460.7 million at December 31, 2024. We expect to fund these commitments to the extent utilized primarily through the repayment of existing loans, principal paydowns of investment securities, and liquid assets.

Over the next twelve months, $230.2 million of time deposits will mature. We expect that a high percentage of these funds will remain with the Bank either through renewals or shifts to other deposit products. Any outflows can be absorbed by the Bank's excess liquidity. We believe our emphasis on local deposits, combined with our immediately available funding sources, provides a very stable base for our liquidity needs.

We had no outstanding borrowings under our credit facilities as of December 31, 2024, and $26.0 million as of December 31, 2023, as discussed in Note 7 to the Consolidated Financial Statements in ITEM 8 of this report.

Because Bancorp is a holding company and does not conduct regular banking operations, its primary sources of liquidity are dividends from the Bank. Under the California Financial Code, payment of a dividend from the Bank to Bancorp without advance regulatory approval is restricted to the lesser of the Bank’s retained earnings or the amount of the Bank’s net profits from the previous three fiscal years less the amount of dividends paid during that period. The Bank received approval from the State of California - Department of Financial Protection and Innovation on May 30, 2024, for a dividend of $19.0 million which was paid to Bancorp on June 24, 2024. The primary uses of funds for Bancorp are shareholder dividends, share repurchases and ordinary operating expenses. Bancorp held $10.3 million in cash as of December 31, 2024, which is expected to cover cash needs into the second quarter of 2025.

Statement Regarding Use of Non-GAAP Financial Measures

Financial results are presented in accordance with GAAP and with reference to certain non-GAAP financial measures. Management believes that, given industry turmoil that largely began in the first quarter of 2023, the presentation of Bancorp's non-GAAP TCE ratio reflecting the after tax impact of unrealized losses on held-to-maturity securities provides useful supplemental information to investors because it reflects the level of capital remaining after a hypothetical liquidation of the entire securities portfolio. In addition, management believes that providing selected financial measures excluding the loss on sale of securities discussed above is useful to investors as the strategic short-term loss taken for long-term profitability makes the operational performance difficult to compare to the prior period. The year 2022 did not have a material loss on sale of securities and was therefore excluded below. Because there are limits to the usefulness of this or any other non-GAAP measure to investors, Bancorp encourages readers to consider its annual and quarterly consolidated financial statements and notes related thereto in their entirety, as filed with the Securities and Exchange Commission, and not to rely on any single financial measure. A reconciliation of the GAAP financial measures to comparable non-GAAP financial measures is presented below.

52

Reconciliation of GAAP and Non-GAAP Financial Measures

(in thousands, unaudited) December 31, 2024 December 31, 2023

Tangible Common Equity - Bancorp

Goodwill and core deposit intangible (75,546) (76,520)

Unrealized losses on HTM securities, net of tax1 (89,171) (86,500)

Unrealized losses on HTM securities included in AOCI, net of tax2 7,701 8,761

TCE, net of unrealized losses on HTM securities (non-GAAP) b $ 278,391 284,803

Goodwill and core deposit intangible (75,546) (76,520)

Unrealized losses on HTM securities, net of tax1 (89,171) (86,500)

Unrealized losses on HTM securities included in AOCI, net of tax2 7,701 8,761

Bancorp TCE ratio a / c 9.93 % 9.73 %

Tangible Book Value Per Share

Tangible book value per share a / e $ 22.37 $ 22.44

(in thousands, except per share amounts; unaudited) Years ended

Adjustments:

Related income tax benefit (9,619) (1,742)

Diluted (loss) earnings per share

Diluted (loss) earnings per share (GAAP) $ (0.52) $ 1.24

Comparable diluted earnings per share (non-GAAP) $ 0.90 $ 1.50

Return on average assets

Return on average assets (GAAP) (0.22) % 0.49 %

Comparable return on average assets (non-GAAP) 0.38 % 0.59 %

Return on average equity

Return on average equity (GAAP) (1.93) % 4.69 %

Comparable return on average equity (non-GAAP) 3.34 % 5.67 %

Efficiency ratio

Comparable efficiency ratio (non-GAAP) 77.30 % 69.94 %

53

ITEM 7A. Quantitative and Qualitative Disclosures about Market Risk

Market risk is defined as the risk of loss arising from an adverse change in the market value (or prices) of financial instruments. A significant component of market risk is interest rate risk, which is inherent in our lending, investment, borrowing, and deposit gathering activities. The Bank manages interest rate sensitivity to minimize the exposure of our net interest margin, earnings, and capital to changes in interest rates. Interest rate changes can create fluctuations in the net interest margin due to an imbalance in the timing of repricing, or maturity of assets or liabilities. Interest rate changes can also affect the market value of our financial instruments, such as available-for-sale securities and the related unrealized gains or losses, which affect our equity value.

To mitigate interest rate risk, the structure of our assets and liabilities is managed with the objective of correlating the effects of interest rate changes on loans and investments with those of deposits and borrowings. The Asset/Liability Management Policy sets limits on the acceptable amount of change to net interest income and the economic value of equity in different interest rate environments.

From time to time, we enter into interest rate swap contracts to mitigate the changes in the fair value of selected investment securities and specified long-term fixed-rate loans and firm commitments to enter into long-term fixed-rate loans caused by changes in interest rates. Refer to Note 14 to the Consolidated Financial Statements in ITEM 8 of this report.

ALCO and the Board of Directors review our exposure to interest rate risk at least quarterly. We use simulation models to measure interest rate risk and to evaluate strategies to improve profitability in the context of policy guidelines. A simplified statement of condition is prepared on a quarterly basis as a starting point, using instrument level data of our actual loans, investments, borrowings and deposits as inputs. If potential changes to net equity value and net interest income resulting from hypothetical interest rate changes are not within the limits established by the Board of Directors, management may adjust the asset and liability mix to bring the risk position within approved limits or take other actions. Governing policies are subject to review by regulators and are updated to incorporate their observations and adapt to changes in idiosyncratic and systemic risks. As of December 31, 2024, interest rate risk was within the policy guidelines established by ALCO and the Board. One set of interest rates modeled and evaluated against flat interest rates and a static balance sheet is a series of immediate parallel shifts in the yield curve. Our most recent analysis of our interest rate sensitivity is provided in the following table as an example rather than an expectation of likely interest rate movements.

Interest rate sensitivity is a function of the repricing characteristics of our assets and liabilities. The Bank runs a combination of scenarios and sensitivities in its attempt to capture the range of interest rate risk including the simulations mentioned above. As with any simulation model or other method of measuring interest rate risk, limitations are inherent in the process and results are dependent on assumptions. For example, lower deposit growth than modeled may cause the Bank to increase its borrowing position, thereby increasing its liability sensitivity. Additionally, assets and liabilities may react differently to changes in market interest rates in terms of both timing and responsiveness to market rate movements. Important deposit modeling assumptions include the speed of deposit run-off and the amount by which interest-bearing deposit rates increase or decrease when market interest rates change, otherwise known as the deposit beta.

The above tables reflect deposit betas of up to 70%, averaging 43%, to rates paid on non-maturity interest-bearing deposits in rising rate scenarios. Deposit betas of up to 60%, averaging 35%, are applied to rates paid on non-

54

maturity interest-bearing deposits in falling rate scenarios with a two month lag assumed. However, deposit pricing is actively managed at the relationship level and closely monitored real-time to avoid unintended consequences. The actual rates and timing of prepayments on loans and investment securities could vary significantly from the assumptions applied in the various scenarios. Lastly, uneven changes in different tenors of U.S. Treasury rates that result in changes to the shape of the yield curve could produce different results from those presented in the table. Accordingly, the results presented should not be relied upon as indicative of actual results in the event of changing market interest rates.

55

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors

Bank of Marin Bancorp

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of condition of Bank of Marin Bancorp and Subsidiary (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of comprehensive income (loss), changes in stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2024 and 2023, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by COSO.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s consolidated financial statements and an opinion on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail,

56

accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made

only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Allowance for Credit Losses on Loans

As described in Note 1 and Note 3 to the consolidated financial statements, the allowance for credit losses on loans at December 31, 2024, was $30.7 million on a total loan portfolio of $2.1 billion. The allowance for credit losses provides an estimate of lifetime expected losses in the loan portfolio. The measurement of expected credit losses is based on relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets.

We identified the forecasted economic conditions and qualitative internal and external risk factors used in the allowance for credit losses on loans as a critical audit matter. The principal considerations for our determination of these components of the allowance for credit losses on loans as a critical audit matter are subjectivity of the estimation and application of forecasted economic conditions and qualitative internal and external risk factors used in the calculation. The economic forecast component of the allowance for credit losses on loans is used to compare the conditions that existed during the historical period to current conditions and future expectations. The qualitative internal and external risk factors are used to adjust for differences in segment-specific risk characteristics or conditions that differ from those that existed during the historical period for which the probability of default and loss given default factors were developed. Auditing management’s judgements regarding the forecasted economic conditions and qualitative internal and external risk factors applied to the allowance for credit losses on loans involved a high degree of subjectivity.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. Our audit procedures related to the allowance for credit losses on loans included the following, among others:

• Testing the design, implementation, and operating effectiveness of controls related to management’s calculation of the allowance for credit losses on loans, including controls over the forecasted economic conditions and qualitative internal and external risk factors utilized.

• Testing the appropriateness of the methodology used in the calculation of the allowance for credit losses on loans, as well as testing completeness and accuracy of the data used in the calculation, application of the forecasted economic conditions and qualitative internal and external risk factors determined by management and used in the calculation, and verifying calculations in the allowance for credit losses on loans.

• Obtaining management’s analysis and supporting documentation related to the forecasted economic conditions and testing whether the forecasts used in the calculation of the allowance for credit losses on loans are reasonable and supportable based on the analysis provided by management.

57

• Obtaining management’s analysis of qualitative internal and external risk factors and evaluating the reasonableness of the assumptions used in determining the qualitative factor adjustments.

/s/ Moss Adams LLP

Portland, Oregon

March 14, 2025

We have served as the Company’s auditor since 2004.

58

March 14, 2025

Management's Report on Internal Control over Financial Reporting

Management of Bank of Marin Bancorp and subsidiary, (the "Company") is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles ("GAAP"). The Company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the Company's assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that receipts and expenditures are being made only in accordance with authorizations of management and board of directors; and (3) provide reasonable assurance regarding prevention, or timely detection and correction of unauthorized acquisition, use, or disposition of the Company's assets that could have a material effect on the financial statements.

Management conducted an assessment of the effectiveness of internal control over financial reporting as of December 31, 2024, utilizing the framework established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on this assessment, management has concluded that the Company maintained effective internal control over financial reporting as of December 31, 2024.

The Company's independent registered public accounting firm, Moss Adams LLP, has issued an integrated audit opinion on our internal control over financial reporting, which appears on the previous page.

/s/ Timothy D. Myers

Timothy D. Myers, President and Chief Executive Officer

/s/ Dave Bonaccorso

Dave Bonaccorso, EVP and Chief Financial Officer

59

BANK OF MARIN BANCORPCONSOLIDATED STATEMENTS OF CONDITION

(in thousands, except share data) 2024 2023

Assets

Cash, cash equivalents and restricted cash $ 137,304 $ 30,453

Investment securities:

Allowance for credit losses on loans (30,656) (25,172)

Bank premises and equipment, net 6,832 7,792

Liabilities and Stockholders' Equity

Liabilities

Deposits:

Interest bearing:

Borrowings and other obligations 154 26,298

Interest payable and other liabilities 24,250 25,562

Commitments and contingent liabilities (Note 12)

Stockholders' Equity

Preferred stock, no par value, Authorized - 5,000,000 shares, none issued — —

Accumulated other comprehensive loss, net of tax (30,068) (53,006)

The accompanying notes are an integral part of these consolidated financial statements.

60

BANK OF MARIN BANCORPCONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

Interest income

Interest on federal funds sold and due from banks 6,714 2,329 1,407

Interest expense

Interest on interest-bearing transaction accounts 1,201 1,036 421

Interest on borrowings and other obligations 241 11,562 91

Provision for (reversal of) credit losses on loans 5,550 2,575 (63)

Reversal of credit losses on unfunded loan commitments (233) (342) (318)

Non-interest income

Net losses on sale of investment securities (32,541) (5,893) (63)

Non-interest expense

Federal Deposit Insurance Corporation insurance 1,863 1,878 1,179

Other real estate owned — 48 359

Net (loss) income per common share:

Weighted average common shares:

Comprehensive income (loss):

Other comprehensive income (loss):

The accompanying notes are an integral part of these consolidated financial statements.

61

BANK OF MARIN BANCORPCONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY

Shares Amount

Other comprehensive loss, net of tax — — — (71,722) (71,722)

Stock issued under employee stock purchase plan 2,025 62 — — 62

Stock issued under employee stock ownership plan 38,000 1,233 — — 1,233

Restricted stock granted 46,672 — — — —

Restricted stock forfeited / cancelled (13,692) — — — —

Stock-based compensation - stock options — 251 — — 251

Stock-based compensation - restricted stock — 712 — — 712

Cash dividends paid on common stock ($0.98 per share) — — (15,673) — (15,673)

Stock purchased by directors under director stock plan 515 16 — — 16

Stock issued in payment of director fees 10,145 355 — — 355

Stock repurchased, including commissions (23,275) (877) — — (877)

Other comprehensive income, net of tax — — — 20,740 20,740

Stock issued under employee stock purchase plan 2,527 46 — — 46

Stock issued under employee stock ownership plan 58,400 1,315 — — 1,315