Nature of Business and Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2025
Nature of Business and Summary of Significant Accounting Policies
Nature of Business and Summary of Significant Accounting Policies	Note 1— Nature of Business and Summary of Significant Accounting Policies Nature of Banking Activities John Marshall Bancorp, Inc. (the “Company”), headquartered in Reston, Virginia, became the registered bank holding company under the Bank Holding Company Act of 1956 for its wholly-owned subsidiary, John Marshall Bank (the “Bank”), on March 1, 2017. This reorganization was completed through a one-for-one share exchange in which the Bank’s shareholders received one share of voting common stock of the Company in exchange for each share of the Bank’s voting common stock. The Company was formed on April 21, 2016 under the laws of the Commonwealth Virginia. The Bank was formed on April 5, 2005 under the laws of the Commonwealth of Virginia and was chartered as a bank on February 9, 2006, by the Virginia Bureau of Financial Institutions. The Bank is a member of the Federal Reserve System and is subject to the rules and regulations of the Virginia Bureau of Financial Institutions, the Board of Governors of the Federal Reserve System (the “Federal Reserve”) and the Federal Deposit Insurance Corporation (“FDIC”). The Bank opened for business on April 17, 2006 and provides banking services to its customers primarily in the Washington, D.C. metropolitan area. Basis of Presentation The accounting and reporting policies of John Marshall Bancorp, Inc. conform to generally accepted accounting principles in the United States of America (“GAAP”) and reflect practices of the banking industry. The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial reporting and with applicable quarterly reporting regulations of the U.S. Securities and Exchange Commission (“SEC”). They do not include all of the information and notes required by GAAP for complete financial statements. As such, these consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto as of and for the year ended December 31, 2024, included in the Company’s 2024 Annual Report on Form 10-K filed with the SEC on March 28, 2025. The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany accounts and transactions between the Company and the Bank have been eliminated. In preparing financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan credit losses. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the results of operations in these financial statements, have been made. The results of operations for the three and six months ended June 30, 2025 are not necessarily indicative of the results to be expected for any other interim period or for the full year. All amounts and disclosures included in this quarterly report as of December 31, 2024, were derived from the Company’s audited consolidated financial statements. Significant Accounting Policies and Estimates Application of the principles of GAAP and practices within the banking industry requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, the financial statements may reflect different estimates, assumptions, and judgments. Certain policies inherently rely more extensively on the use of estimates, assumptions, and judgments and as such may have a greater possibility of producing results that could be materially different than originally reported. The Company's significant accounting policies followed in the preparation of the unaudited consolidated financial statements are disclosed in Note 1 of the audited financial statements and notes for the year ended December 31, 2024 and are contained in the Company's 2024 Annual Report on Form 10-K. There have been no significant changes to the application of significant accounting policies since December 31, 2024. Recent Accounting Pronouncements In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The amendments in this ASU require an entity to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold, which is greater than five percent of the amount computed by multiplying pretax income by the entity’s applicable statutory rate, on an annual basis. Additionally, the amendments in this ASU require an entity to disclose the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes and the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions that are equal to or greater than five percent of total income taxes paid (net of refunds received). Lastly, the amendments in this ASU require an entity to disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign and income tax expense (or benefit) from continuing operations disaggregated by federal, state, and foreign. This ASU is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company will apply the guidance in ASU 2023-09 for annual periods beginning after December 15, 2024, and will enhance its income tax disclosures in accordance with the requirements. The adoption will be applied prospectively and is not anticipated to have a material impact on the Company’s Consolidated financial statements. In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specific information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. In January 2025, the FASB issued ASU 2025-01, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date.” ASU 2025-01 amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Implementation of ASU 2024-03 may be applied prospectively or retrospectively. Early adoption of ASU 2024-03 is permitted. The Company does not expect the adoption of ASU 2024-03 to have a material impact on its Consolidated financial statements.

Nature of Business and Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2025

Nature of Business and Summary of Significant Accounting Policies

Nature of Business and Summary of Significant Accounting Policies

Note 1— Nature of Business and Summary of Significant Accounting Policies

Nature of Banking Activities

John Marshall Bancorp, Inc. (the “Company”), headquartered in Reston, Virginia, became the registered bank holding company under the Bank Holding Company Act of 1956 for its wholly-owned subsidiary, John Marshall Bank (the “Bank”), on March 1, 2017. This reorganization was completed through a one-for-one share exchange in which the Bank’s shareholders received one share of voting common stock of the Company in exchange for each share of the Bank’s voting common stock. The Company was formed on April 21, 2016 under the laws of the Commonwealth Virginia. The Bank was formed on April 5, 2005 under the laws of the Commonwealth of Virginia and was chartered as a bank on February 9, 2006, by the Virginia Bureau of Financial Institutions. The Bank is a member of the Federal Reserve System and is subject to the rules and regulations of the Virginia Bureau of Financial Institutions, the Board of Governors of the Federal Reserve System (the “Federal Reserve”) and the Federal Deposit Insurance Corporation (“FDIC”). The Bank opened for business on April 17, 2006 and provides banking services to its customers primarily in the Washington, D.C. metropolitan area.

Basis of Presentation

The accounting and reporting policies of John Marshall Bancorp, Inc. conform to generally accepted accounting principles in the United States of America (“GAAP”) and reflect practices of the banking industry. The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial reporting and with applicable quarterly reporting regulations of the U.S. Securities and Exchange Commission (“SEC”). They do not include all of the information and notes required by GAAP for complete financial statements. As such, these consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto as of and for the year ended December 31, 2024, included in the Company’s 2024 Annual Report on Form 10-K filed with the SEC on March 28, 2025.

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany accounts and transactions between the Company and the Bank have been eliminated. In preparing financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan credit losses.

In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the results of operations in these financial statements, have been made. The results of operations for the three and six months ended June 30, 2025 are not necessarily indicative of the results to be expected for any other interim period or for the full year. All amounts and disclosures included in this quarterly report as of December 31, 2024, were derived from the Company’s audited consolidated financial statements.

Significant Accounting Policies and Estimates

Application of the principles of GAAP and practices within the banking industry requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, the financial statements may reflect different estimates, assumptions, and judgments. Certain policies inherently rely more extensively on the use of estimates, assumptions, and judgments and as such may have a greater possibility of producing results that could be materially different than originally reported.

The Company's significant accounting policies followed in the preparation of the unaudited consolidated financial statements are disclosed in Note 1 of the audited financial statements and notes for the year ended December 31, 2024 and are contained in the

Company's 2024 Annual Report on Form 10-K. There have been no significant changes to the application of significant accounting policies since December 31, 2024.

Recent Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The amendments in this ASU require an entity to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold, which is greater than five percent of the amount computed by multiplying pretax income by the entity’s applicable statutory rate, on an annual basis. Additionally, the amendments in this ASU require an entity to disclose the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes and the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions that are equal to or greater than five percent of total income taxes paid (net of refunds received). Lastly, the amendments in this ASU require an entity to disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign and income tax expense (or benefit) from continuing operations disaggregated by federal, state, and foreign. This ASU is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company will apply the guidance in ASU 2023-09 for annual periods beginning after December 15, 2024, and will enhance its income tax disclosures in accordance with the requirements. The adoption will be applied prospectively and is not anticipated to have a material impact on the Company’s Consolidated financial statements.

In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specific information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. In January 2025, the FASB issued ASU 2025-01, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date.” ASU 2025-01 amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Implementation of ASU 2024-03 may be applied prospectively or retrospectively. Early adoption of ASU 2024-03 is permitted. The Company does not expect the adoption of ASU 2024-03 to have a material impact on its Consolidated financial statements.