MainStreet Bancshares, Inc. (MNSB) CFO files Form 4 for stock sales

Rhea-AI Filing Summary

MainStreet Bancshares, Inc. reported insider stock sales by its director and CFO on 12/08/2025. The reporting person sold 12,234 shares of common stock at $20.10 per share and a further 11,343 shares at $19.75 per share, both coded as sales. After these transactions, the insider directly owned 70,999 shares of common stock and indirectly owned 56,794 shares through a 401(k) plan. According to the footnote, the sales were effected pursuant to a Form 144 that was filed on December 2, 2025.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

CHMELIK THOMAS J

(Last) (First) (Middle)

10089 FAIRFAX BLVD

(Street)

FAIRFAX VA 22030

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MainStreet Bancshares, Inc. [ MNSB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CFO, MainStreet Bancshares Inc

3. Date of Earliest Transaction (Month/Day/Year)
12/08/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	12/08/2025		S(1)		12,234	D	$20.1	82,342	D
Common Stock	12/08/2025		S(1)		11,343	D	$19.75	70,999	D
Common Stock								56,794	I	By 401(k) Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was effected pursuant to a Form 144 previously filed on December 2, 2025.

	/s/ Richard A. Vari, attorney-in-fact	12/08/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did MainStreet Bancshares (MNSB) disclose in this Form 4?

The Form 4 reports that a MainStreet Bancshares, Inc. director and CFO sold 12,234 shares of common stock at $20.10 per share and 11,343 shares at $19.75 per share on 12/08/2025.

What is the reporting person’s role at MainStreet Bancshares (MNSB)?

The reporting person is both a director and an officer, serving as CFO of MainStreet Bancshares, Inc.

How many MainStreet Bancshares (MNSB) shares does the CFO own after the reported sales?

Following the reported transactions, the CFO directly owned 70,999 shares of MainStreet Bancshares common stock and indirectly owned 56,794 shares through a 401(k) plan.

When did the insider trades in MainStreet Bancshares (MNSB) stock occur?

The earliest transaction date reported is 12/08/2025, and both common stock sales listed in the Form 4 took place on that date.

At what prices were the MainStreet Bancshares (MNSB) shares sold?

The insider sold 12,234 shares at a price of $20.10 per share and 11,343 shares at a price of $19.75 per share.

Were the MNSB stock sales related to a previously filed Form 144?

Yes. The explanatory note states that the transaction was effected pursuant to a Form 144 that was previously filed on December 2, 2025.

Is this MainStreet Bancshares (MNSB) Form 4 filed by a single reporting person?

Yes. The Form 4 indicates that it is a filing by one reporting person, not a joint or group filing.