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): November 21, 2025

MainStreet Bancshares, Inc.

(Exact name of Registrant as Specified in Its Charter)

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

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

(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:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock	MNSB	The Nasdaq Stock Market LLC
Depositary Shares (each representing a 1/40^th interest in a share of 7.50% Series A Fixed-Rate Non-Cumulative Perpetual Preferred Stock)	MNSBP	The Nasdaq Stock Market LLC

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 8.01 Other Events.

On November 21, 2025, the Board of Directors of MainStreet Bancshares, Inc. announced the declaration of a quarterly cash dividend on the outstanding shares of the Company’s 7.50% Series A Fixed-Rate Non-Cumulative Perpetual Preferred Stock, par value $1.00 per share (the “Series A Preferred Stock”). On September 15 and 25, 2020, the Company issued an aggregate of 1,150,000 depositary shares (the “Depositary Shares”), each representing a 1/40th ownership interest in a share of the Series A Preferred Stock, with a liquidation preference of $1,000 per share of Series A Preferred Stock (equivalent to $25 per Depositary Share), which represents $28,750,000 in aggregate liquidation preference.

The declared cash dividend equated to approximately $0.47 per Depositary Share, or $18.75 per share of Series A Preferred Stock outstanding. The cash dividend is payable on December 30, 2025, to shareholders of record as of the close of business on December 15, 2025. When, as, and if declared by the Board of Directors, future dividend payment dates on the Series A Preferred Stock and associated Depositary Shares will be payable quarterly, in arrears, on March 30, June 30, September 30 and December 30 of each year.

The Company’s Depositary Shares trade on the Nasdaq Capital Market under the symbol “MNSBP.”

The information furnished under Item 8.01 of this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, and it shall not be deemed incorporated by reference in any filing under the Exchange Act, or the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing to this Form 8-K.

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.

	MAINSTREET BANCSHARES, INC

Date: November 21, 2025	By:	/s/ Thomas J. Chmelik
		Name: Thomas J. Chmelik
		Title: Chief Financial Officer

MainStreet Bancshares, Inc. 8-K