John Marshall Bancorp, Inc.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of September 30, 2025. Based on their evaluation of the Company’s disclosure controls and procedures, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures designed to ensure that information required to be disclosed by the Company in reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and regulations are designed and operating in an effective manner.

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the third fiscal quarter of 2025 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.