MainStreet Bancshares, Inc.

The Company has adopted a Code of Ethics and Business Conduct that applies to all the Company’s and the Bank’s directors, officers, and other employees. The Company has also adopted a Code of Ethics for Senior Financial Officers. The Codes of Ethics are available on the “Investor Relations” page of our website, ir.mstreetbank.com/governance/governance-documents. Amendments to and waivers from the Code of Ethics for Senior Financial Officers will also be disclosed on our website. We may elect to disclose any such amendment or waiver in a report on Form 8-K filed with the SEC in addition to or in lieu of the website disclosure.

The Code of Ethics and Business Conduct is applicable to all employees. It is the Company’s policy that all employees conduct their business affairs in such a manner and with such ethics and integrity that no conflict of interest, either real or implied, can be construed. Each employee is responsible to uphold and comply with this Code. Potential conflicts of interest identified in the Code include self-dealing, outside employment and other activities, corporate opportunities, management interlocks, improper gifts/payments to employees, relationships with suppliers, confidentiality of customers’ and corporate information, insider trading, and relationships with government officials.

It is expected that all directors, officers, and employees act in accordance with the highest standards of personal and professional conduct in all aspects of their employment and association with the Company and the Bank, to comply with all applicable laws, rules, and regulations and to adhere to all policies and procedures adopted by the Company and the Bank.