X0407 4/A 2023-05-16 2023-05-16 0001693577 MainStreet Bancshares, Inc. MNSB 0001774482 CHMELIK THOMAS J 10089 FAIRFAX BLVD FAIRFAX VA 22030 1 1 Chief Financial Officer 0 Common Stock 50003 I By 401(k) Plan Common Stock 2023-05-16 4 J 0 5429 D 93502 D Common Stock 1000 I By wife The original Form 4 filed on May 16, 2023, is being amended solely to correct an administrative error which misreported the number and form of ownership of shares beneficially owned by the Reporting Person. As a result of the error, the number of shares owned by the Reporting Person in this amendment reflects a reduction in 1,511 shares totally owned and an adjustment to increase shares indirectly owned by 3,918. /s/ Thomas J. Chmelik 2023-05-18