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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 20, 2026

$\"mlogo.jpg\"$

MainStreet Bancshares, Inc.

(Exact name of Registrant as Specified in Its Charter)

\n\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\n

\n\t\t\t Virginia \n\t\t\t	\n\t\t\t 001-38817 \n\t\t\t	\n\t\t\t 81-2871064 \n\t\t\t
\n\t\t\t (State or Other Jurisdiction \n\n\t\t\t of Incorporation) \n\t\t\t	\n\t\t\t (Commission File Number) \n\t\t\t	\n\t\t\t (IRS Employer \n\n\t\t\t Identification No.) \n\t\t\t

\n\t\t\t 10089 Fairfax Boulevard, Fairfax, VA \n\t\t\t		\n\t\t\t 22030 \n\t\t\t
\n\t\t\t (Address of Principal Executive Offices) \n\t\t\t		\n\t\t\t (Zip Code) \n\t\t\t

(703) 481-4567

(Registrant’s Telephone Number, Including Area Code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

\n\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\n\n

\n\t\t\t

Title of each class

\n\t\t\t

Trading

\n\n\t\t\t

Symbol(s)

\n\t\t\t

Name of each exchange on which registered

\n\t\t\t

Common Stock

\n\t\t\t

MNSB

\n\t\t\t

The Nasdaq Stock Market LLC

\n\t\t\t

Depositary Shares (each representing a 1/40^th
\n\t\t\tinterest in a share of 7.50% Series A Fixed-Rate
\n\t\t\tNon-Cumulative Perpetual Preferred Stock

\n\t\t\t

MNSBP

\n\t\t\t

The Nasdaq Stock Market LLC

\n\t\t\t

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01 Regulation FD Disclosure

On October 20, 2026, MainStreet Bancshares, Inc. (the \"Company\") announced that it will conduct a virtual webcast and quarterly earnings conference call on Monday, October 26, 2026, at 2:00 p.m. Eastern Time during which the Company will discuss third quarter results as well as provide an update on recent activities. Investors that are interested in attending the virtual webcast should contact Hattie Lester by email at hlester@mstreetbank.com or by phone at (571)-375-1364.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t MAINSTREET BANCSHARES, INC \n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t
\n\t\t\t Date: October 20, 2026 \n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t By: \n\t\t\t	\n\t\t\t /s/ Richard A. Vari \n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t Name: Richard A. Vari \n\t\t\t
\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t\n\t\t\t	\n\t\t\t Title: Chief Financial Officer \n\t\t\t

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