JMSB director buys 179 shares via dividend reinvestment

John Marshall Bancorp director Oscar Leland Mahan reported a small open-market dividend reinvestment purchase of 179 shares of common stock at $21.03 per share.

Accepted by SEC EDGAR 06/05/2026 - 01:59 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

John Marshall Bancorp director Oscar Leland Mahan reported a small open-market dividend reinvestment purchase of 179 shares of common stock at $21.03 per share. After this transaction, he directly owns 94,981 shares of the company’s stock, including 2,706 shares tied to unvested restricted stock awards that will be issued upon vesting.

Insider Trade Summary

Net Buyer: 179 shares

Net Buy 1 txn

Insider Mahan Oscar Leland

Role Director

Bought 179 shs ($4K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	179	$21.03	$4K

Holdings After Transaction: Common Stock — 94,981 shares (Direct)

Footnotes (2)

1. F1. Reinvestment of cash dividends.
2. F2. Includes 2,706 shares relating to unvested restricted stock awards issuable upon vesting.

Key Figures

Shares purchased: 179 shares Purchase price: $21.03 per share Total holdings after transaction: 94,981 shares +1 more

4 metrics

Shares purchased 179 shares Dividend reinvestment on 2026-06-03

Purchase price $21.03 per share Open-market dividend reinvestment

Total holdings after transaction 94,981 shares Common stock directly owned after purchase

Unvested restricted stock 2,706 shares Included in total holdings, issuable upon vesting

Key Terms

open-market purchase, reinvestment of cash dividends, restricted stock awards, Common Stock

4 terms

open-market purchase financial

"transaction_action: open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

reinvestment of cash dividends financial

"Footnote: Reinvestment of cash dividends."

restricted stock awards financial

"Includes 2,706 shares relating to unvested restricted stock awards issuable upon vesting."

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Oscar Leland Mahan do in this Form 4 for JMSB?

Oscar Leland Mahan reported buying 179 shares of John Marshall Bancorp common stock through dividend reinvestment. The transaction was coded as an open-market purchase at $21.03 per share and reflects continued share accumulation by a company director.

What price did Oscar Leland Mahan pay per JMSB share in this filing?

He acquired the 179 JMSB shares at a price of $21.03 per share. The purchase is described as a reinvestment of cash dividends, indicating the transaction was executed automatically rather than as a large discretionary open-market trade.

How many John Marshall Bancorp (JMSB) shares does Mahan own after the transaction?

Following the transaction, Oscar Leland Mahan directly owns 94,981 JMSB common shares. This total includes his existing holdings and the 179 newly acquired shares, providing a snapshot of his overall direct equity position after the dividend reinvestment.

Are restricted stock awards included in Mahan’s reported JMSB holdings?

Yes. The filing notes that his total includes 2,706 shares related to unvested restricted stock awards. These shares will be issued upon vesting, meaning they are part of his potential equity but have not yet fully vested as of this report.

Was the JMSB share purchase by Oscar Leland Mahan part of a dividend reinvestment?

Yes. A footnote states the 179-share purchase was a reinvestment of cash dividends. Dividend reinvestment transactions are typically automatic and indicate that dividends paid on existing holdings were used to buy additional JMSB shares instead of taking cash.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Mahan Oscar Leland

(Last) (First) (Middle)

1943 ISAAC NEWTON SQUARE EAST

SUITE 100

(Street)

RESTON VIRGINIA 20190

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
John Marshall Bancorp, Inc. [ JMSB ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/03/2026

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

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

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

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	06/03/2026		P(1)		179	A	$21.03	94,981(2)	D

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. Reinvestment of cash dividends.

2. Includes 2,706 shares relating to unvested restricted stock awards issuable upon vesting.

	/s/ Jacob A. Gruninger, Attorney-in-Fact	06/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)