PLUMAS BANCORP

Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of Plumas Bancorp and Subsidiary

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Plumas Bancorp and its subsidiary (the Company) as of December 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, shareholders’ equity and cash flows for the years then ended, and the related notes to the consolidated financial statements (collectively referred to as the financial statements). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for the years then ended, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements 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 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 audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the 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 financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the 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 financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Allowance for Credit Losses–* Collectively Evaluated Loans*

As described in Note 5 to the Company’s financial statements, the Company has a gross loan portfolio of approximately $1.5 billion and related allowance for credit losses of $20.0 million as of December 31, 2025. As described by the Company in Note 2 to the Company’s financial statements, the Company uses a discounted cash flow method to estimate expected credit losses. In addition to its own loss experience, the Company also includes peer bank historical loss experience in its assessment of expected credit losses to determine the allowance for credit losses. The Company utilized call report data to measure its and its peers' historical credit losses experience with similar risk characteristics within the segments over an economic cycle. Also considered were further adjustments to historical loss information to appropriately adjust for the impact of portfolio concentrations, changes in underwriting practices, imprecision in its economic forecasts, and other risk factors that might influence its loss estimation process.

We identified the Company’s estimate of the allowance for credit losses (“ACL”) for collectively evaluated loans as a critical audit matter. The principal considerations for our determination of the allowance for credit losses as a critical audit matter related to the high degree of subjectivity in the Company’s determination of significant model assumptions, including the determination of qualitative factor adjustments and macroeconomic data in the reasonable and supportable forecasts. Auditing these complex judgments and assumptions by the Company involves especially challenging auditor judgment due to the nature and extent of audit evidence and effort required to address these matters, including the extent of specialized skill or knowledge needed.

The primary procedures we performed to address this critical audit matter included the following:

Business Combination–* Valuation of Acquired Loan Portfolio*

As described in Note 18 to the Company’s financial statements, on July 1, 2025, the Company acquired Cornerstone Community Bancorp (“CCB”). The transaction has been accounted for as a business combination and accordingly, the identifiable assets acquired and liabilities assumed from CCB were recorded at fair value as of the acquisition date. The fair value of acquired loans held for investment was $462.5 million. Determining the fair value of acquired loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. The market rate adjustment represents the movement in market interest rates, irrespective of credit adjustments, compared to the contractual rates of the acquired loans. The credit adjustment made on pools of homogeneous loans represents the changes in credit quality of the underlying borrowers from loan inception to the acquisition date.

We identified the fair value of acquired loans held for investment as a critical audit matter due to the high degree of complexity and auditor judgment involved and the extent of effort involved, including the use of professionals with specialized skill and knowledge, in testing the Company’s estimates and assumptions, including the discount rates and prepayment rates used in the discounted cash flow methodology.

The primary procedures we performed to address the critical audit matter include the following:

/s/ Elliott Davis, LLC

We have served as the Company's auditor since 2024.

Franklin, Tennessee

March 19, 2026

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders

Plumas Bancorp and Subsidiary

Reno, Nevada

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated statements of income, comprehensive income, changes in shareholders’ equity, and cash flows of Plumas Bancorp and Subsidiary (the “Company”) for the year ended December 31, 2023, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the results of its operations and its cash flows for the year ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audit. 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 audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

Our audit included performing procedures to assess the risk of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audit also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audit provides a reasonable basis for our opinion.

Change in Accounting Principle

As discussed in Note 2 to the financial statements, the Company adopted the provisions of FASB Accounting Standards Update 2016-13,Financial Instruments–* Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments*, as of January 1, 2023, using the modified retrospective approach with an adjustment at the beginning of the adoption period. Our opinion is not modified with respect to this matter.

We served as the Company’s auditor from 2013 to 2023. Such date incorporates the acquisition of certain assets of Vavrinek, Trine, Day & Co., LLP, by Eide Bailly LLP in 2019.

/s/ Eide Bailly LLP

San Ramon, California

March 20, 2024