Are insiders buying JMSB stock?

Yes — 6 distinct insiders have bought JMSB (John Marshall Bancorp, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was Dec 8, 2025.

How much JMSB stock have insiders bought?

Insiders have bought a combined $836.3K of JMSB across 77 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in JMSB?

A cluster buy is two or more distinct John Marshall Bancorp, Inc. insiders — officers, directors, or 10% owners — each buying JMSB on the open market within a rolling window. JMSB has 1 detected cluster buy to date.

Where does this JMSB insider trading data come from?

Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

JMSB insider buying

1 cluster buy

John Marshall Bancorp, Inc. · Financials

When two or more insiders at John Marshall Bancorp, Inc. buy JMSB on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in JMSB plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.

Clusters

Distinct insiders

Total bought

$836.3K

Market cap

$311.3M

Detected clusters

Feb 20 – Jul 31, 2025
Detected Jul 31, 2025
High conviction6 insiders
Total bought
$603.4K
Market cap
$311.3M

All notable open-market buys in JMSB

Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.

Date	Insider	Shares	Price	Value	Filing
Dec 5, 2025	Kinney Jonathan Craig Director	500	$19.63	$9.8K	SEC ↗
Dec 2, 2025	Kinney Jonathan Craig Director	900	$19.30	$17.4K	SEC ↗
Dec 2, 2025	Kinney Jonathan Craig Director	445	$19.40	$8.6K	SEC ↗
Nov 6, 2025	Kinney Jonathan Craig Director	500	$18.90	$9.5K	SEC ↗
Nov 5, 2025	Kinney Jonathan Craig Director	500	$18.71	$9.4K	SEC ↗
Nov 5, 2025	Kinney Jonathan Craig Director	300	$18.70	$5.6K	SEC ↗
Nov 4, 2025	Kinney Jonathan Craig Director	400	$18.95	$7.6K	SEC ↗
Oct 31, 2025	Kinney Jonathan Craig Director	500	$18.85	$9.4K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	2,400	$18.45	$44.3K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	1,000	$18.60	$18.6K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	551	$18.25	$10.1K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	498	$18.26	$9.1K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	224	$18.35	$4.1K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	115	$18.34	$2.1K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	100	$18.50	$1.9K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	91	$18.41	$1.7K	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	19	$18.18	$345.4	SEC ↗
Jul 31, 2025	Carstater Kentcluster CHIEF FINANCIAL OFFICER	2	$18.24	$36.5	SEC ↗
Jul 30, 2025	GARCIA MICHAEL Acluster Director	6,162	$19.20	$118.3K	SEC ↗
Jul 29, 2025	GARCIA MICHAEL Acluster Director	4,276	$19.20	$82.1K	SEC ↗
Jul 28, 2025	GARCIA MICHAEL Acluster Director	1,876	$19.08	$35.8K	SEC ↗
Jul 28, 2025	GARCIA MICHAEL Acluster Director	871	$19.20	$16.7K	SEC ↗
Jul 15, 2025	Mahan Oscar Lelandcluster Director	712	$18.63	$13.3K	SEC ↗
Jun 12, 2025	Kinney Jonathan Craigcluster Director	700	$17.36	$12.2K	SEC ↗
Jun 11, 2025	Kinney Jonathan Craigcluster Director	200	$17.58	$3.5K	SEC ↗

52 earlier buys hidden — sign in free to see the full history.

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JMSB insider buying — FAQ

Are insiders buying JMSB stock?: Yes — 6 distinct insiders have bought JMSB (John Marshall Bancorp, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was Dec 8, 2025.
How much JMSB stock have insiders bought?: Insiders have bought a combined $836.3K of JMSB across 77 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in JMSB?: A cluster buy is two or more distinct John Marshall Bancorp, Inc. insiders — officers, directors, or 10% owners — each buying JMSB on the open market within a rolling window. JMSB has 1 detected cluster buy to date.
Where does this JMSB insider trading data come from?: Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

How we track insider buying in JMSB

We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy JMSB within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?

This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding JMSB.