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Nasdaq · CIK 0001710482

JMSB John Marshall Bancorp, Inc.

Insider trading from SEC Form 4. Last filing Aug 28, 2026. Close $22.80 on Oct 9, 2026, +24% from the 52-week low and -4% from the high.

In brief

John Marshall Bancorp, Inc. (JMSB) has 73 SEC Form 4 filings on file from 12 insiders, the latest filed on Aug 28, 2026. In the last 90 days insiders made 2 open-market buys worth $57k and 0 open-market sells worth $0, net +$57k.

32 open-market trades have been scored at JMSB. The newest: Philip Chase (director) bought $3,054 of stock on Aug 26, 2026, filed Aug 28, 2026, scored 18 (weak). The largest of the 32 shown: Oscar Leland Mahan (director) sold $210k on Nov 20, 2024, scored 42 (moderate). 2 insiders bought within 14 days of each other around Aug 26, 2026.

6 Form 144 notices of planned sales are on file, the latest filed May 2, 2025.

Last 90 days

Net insider value
+$57k
more bought than sold
Buys
2
$57k by 2 insiders
Sells
0
$0 by 0 insiders
Insiders on file
12
with a Form 4 at this company

Price and insider trades, last year

JMSBOct 9, 2026 · close 22.80

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

Open-market buys and sells at John Marshall Bancorp, Inc., scored.

ScoreInsiderValueHoldingsPrice contextFiled
18WeakPhilip Chase
director
buy
$3,054
133 shares
+0%+24% from low-5% from high
35WeakJonathan Craig Kinney
director
buy
$54k
2,357 shares
+1%+24% from low-5% from high
30WeakJonathan Craig Kinney
director
buy
$48k
2,300 shares
+1%+25% from low-4% from high
18WeakOscar Leland Mahan
director
buy
$3,764
179 shares
+0%+25% from low-4% from high
15WeakJonathan Craig Kinney
director
buy
$9,815
500 shares
+0%+40% from low-14% from high
20WeakJonathan Craig Kinney
director
buy
$26k
1,345 shares
+0%+38% from low-15% from high
19WeakJonathan Craig Kinney
director
buy
$9,450
500 shares
+0%+34% from low-27% from high
19WeakJonathan Craig Kinney
director
buy
$23k
1,200 shares
+0%+35% from low-26% from high
14WeakJonathan Craig Kinney
director
buy
$9,425
500 shares
+0%+37% from low-25% from high
46ModerateKent Carstater
CHIEF FINANCIAL OFFICER
buy
$92k
5,000 shares
+10%+32% from low-28% from high
48ModerateMichael A Garcia
director
buy
$118k
6,162 shares
+22%+33% from low-27% from high
51ModerateMichael A Garcia
director
buy
$135k
7,023 shares
+33%+38% from low-24% from high
22WeakOscar Leland Mahan
director
buy
$13k
712 shares
+1%+32% from low-28% from high
23WeakJonathan Craig Kinney
director
buy
$16k
900 shares
+0%+23% from low-33% from high
23WeakJonathan Craig Kinney
director
buy
$20k
1,150 shares
+0%+22% from low-33% from high
23WeakJonathan Craig Kinney
director
buy
$6,195
356 shares
+0%+22% from low-33% from high
23WeakJonathan Craig Kinney
director
buy
$7,794
448 shares
+0%+23% from low-33% from high
23WeakJonathan Craig Kinney
director
buy
$14k
800 shares
+0%+22% from low-33% from high
24WeakOscar Leland Mahan
director
sell
$88k
5,133 shares
-5%+19% from low-35% from high
44ModerateJonathan Craig Kinney
director
buy
$38k
2,415 shares
+1%+10% from low-40% from high
57ModerateKent Carstater
CHIEF FINANCIAL OFFICER
buy
$79k
5,000 shares
+12%+10% from low-40% from high
41ModerateAndrew Peden
CHIEF BANKING OFFICER
buy
$19k
1,200 shares
+5%+10% from low-40% from high
30WeakJonathan Craig Kinney
director
buy
$46k
2,562 shares
+1%+3% from low-29% from high
24WeakJonathan Craig Kinney
director
buy
$19k
1,022 shares
+1%+6% from low-27% from high
24WeakLim Nguonly
director
sell
$91k
4,000 shares
-6%-
41ModerateLim Nguonly
director
sell
$144k
6,000 shares
-8%-
42ModerateOscar Leland Mahan
director
sell
$210k
9,383 shares
-9%-
39WeakOscar Leland Mahan
director
sell
$82k
3,573 shares
-4%-
37WeakOscar Leland Mahan
director
sell
$62k
2,615 shares
-3%-
30WeakJonathan Craig Kinney
director
sell
$243
10 shares
-0%-
10WeakOscar Leland Mahan
director
buy
$12k
501 shares
+0%-
40ModerateOscar Leland Mahan
director
sell
$95k
3,928 shares
-4%-

Planned sales

Form 144 notices filed before a sale of restricted or control stock, newest first. The sale itself usually reaches a Form 4 within days. All planned sales

FiledSellerSharesValueSale datePast 3 months
May 2, 2025 Mahan Oscar Leland
Director
7,000
0.05% of outstanding
$121kMay 2, 2025none
Feb 6, 2025 Nguonly Paul Lim
Director
10,000
0.07% of outstanding
$197kFeb 6, 2025$235k
Dec 10, 2024 Nguonly Lim
Director
4,000
0.03% of outstanding
$89kDec 10, 2024$144k
Nov 19, 2024 Nguonly Lim
Director
6,000
0.04% of outstanding
$146kNov 19, 2024none
Nov 18, 2024 Mahan Oscar Leland
Director
20,000
0.14% of outstanding
$559kNov 18, 2024none
Oct 30, 2023 Nguonly Paul Lim
Director
5,813
0.04% of outstanding
$101kOct 30, 2023$98k

Transactions

The newest 50 of 252 rows filed, every code.

DateInsiderTransactionSharesPriceValueHoldings afterFiled
Aug 26, 2026Philip Chase
director
POpen-market purchase
Common Stock
+133$22.96$3,05432,408Aug 28, 2026
Aug 26, 2026Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+1,119$22.92$26k330,001Aug 28, 2026
Aug 26, 2026Jonathan Craig Kinney
director
POpen-market purchase
Common Stockindirect: See footnote
+1,238$22.92$28k279,926Aug 28, 2026
Jun 17, 2026Christopher W Bergstrom
CHIEF EXECUTIVE OFFICER
GGift
Common Stock
-32,720$0.00$042,147Jun 26, 2026
Jun 17, 2026Christopher W Bergstrom
CHIEF EXECUTIVE OFFICER
GGift
Common Stockindirect: By trust
+32,720$0.00$032,720Jun 26, 2026
Jun 3, 2026Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+1,092$21.03$23k328,882Jun 5, 2026
Jun 3, 2026Oscar Leland Mahan
director
POpen-market purchase
Common Stock
+179$21.03$3,76494,981Jun 5, 2026
Jun 3, 2026Jonathan Craig Kinney
director
POpen-market purchase
Common Stockindirect: See footnote
+1,208$21.03$25k278,688Jun 5, 2026
Dec 19, 2025Kelly Jo Bell
CHIEF OPERATING OFFICER
FTax withholding
Common Stock
-37$21.36$7901,333Dec 22, 2025
Dec 16, 2025Michael A Garcia
director
AGrant or award
Common Stock
+1,901$0.00$036,273Dec 18, 2025
Dec 16, 2025Subhash Garg
director
AGrant or award
Common Stock
+1,901$0.00$044,213Dec 18, 2025
Dec 16, 2025Jonathan Craig Kinney
director
AGrant or award
Common Stock
+2,138$0.00$0327,790Dec 18, 2025
Dec 16, 2025Michael T Foster
director
AGrant or award
Common Stock
+1,901$0.00$0337,573Dec 18, 2025
Dec 16, 2025Andrew Peden
CHIEF BANKING OFFICER
AGrant or award
Common Stock
+2,376$0.00$026,754Dec 18, 2025
Dec 16, 2025Oscar Leland Mahan
director
AGrant or award
Common Stock
+1,901$0.00$094,802Dec 18, 2025
Dec 16, 2025Philip W Allin
director
AGrant or award
Common Stock
+1,901$0.00$029,963Dec 18, 2025
Dec 16, 2025Christopher W Bergstrom
CHIEF EXECUTIVE OFFICER
AGrant or award
Common Stock
+9,502$0.00$074,867Dec 18, 2025
Dec 16, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
AGrant or award
Common Stock
+3,088$0.00$056,219Dec 18, 2025
Dec 17, 2025Kelly Jo Bell
CHIEF OPERATING OFFICER
FTax withholding
Common Stock
-28$21.37$5981,370Dec 18, 2025
Dec 16, 2025Philip Chase
director
AGrant or award
Common Stock
+1,901$0.00$032,275Dec 18, 2025
Dec 17, 2025Andrew Peden
CHIEF BANKING OFFICER
FTax withholding
Common Stock
-194$21.37$4,14626,560Dec 18, 2025
Dec 5, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+500$19.63$9,815325,652Dec 8, 2025
Dec 2, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+900$19.30$17k324,707Dec 4, 2025
Dec 2, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+445$19.40$8,633325,152Dec 4, 2025
Nov 6, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+500$18.90$9,450323,807Nov 10, 2025
Nov 4, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+400$18.95$7,580322,507Nov 6, 2025
Nov 5, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+300$18.70$5,610322,807Nov 6, 2025
Nov 5, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+500$18.71$9,355323,307Nov 6, 2025
Oct 31, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+500$18.85$9,425322,107Nov 3, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+19$18.18$34548,150Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+2$18.24$3648,152Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+551$18.25$10k48,703Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+498$18.26$9,09349,201Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+115$18.34$2,10949,316Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+224$18.35$4,11049,540Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+91$18.41$1,67549,631Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+2,400$18.45$44k52,031Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+100$18.50$1,85052,131Aug 1, 2025
Jul 31, 2025Kent Carstater
CHIEF FINANCIAL OFFICER
POpen-market purchase
Common Stock
+1,000$18.60$19k53,131Aug 1, 2025
Jul 30, 2025Michael A Garcia
director
POpen-market purchase
Common Stock
+6,162$19.20$118k34,372Jul 31, 2025
Jul 28, 2025Michael A Garcia
director
POpen-market purchase
Common Stock
+871$19.20$17k22,058Jul 30, 2025
Jul 28, 2025Michael A Garcia
director
POpen-market purchase
Common Stock
+1,876$19.08$36k23,934Jul 30, 2025
Jul 29, 2025Michael A Garcia
director
POpen-market purchase
Common Stock
+4,276$19.20$82k28,210Jul 30, 2025
Jul 15, 2025Oscar Leland Mahan
director
POpen-market purchase
Common Stock
+712$18.63$13k92,901Jul 17, 2025
Jun 11, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+200$17.58$3,516320,907Jun 13, 2025
Jun 12, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+700$17.36$12k321,607Jun 13, 2025
Jun 5, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+400$17.30$6,920319,957Jun 9, 2025
Jun 5, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+500$17.25$8,625320,457Jun 9, 2025
Jun 6, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+250$17.70$4,425320,707Jun 9, 2025
Jun 2, 2025Jonathan Craig Kinney
director
POpen-market purchase
Common Stock
+152$17.31$2,631319,353Jun 4, 2025
50 of 252 rows shown.

Insiders

Everyone who has filed a Form 4 here.

Questions about JMSB

Answered from the filings on this page, as of the latest one.

Are insiders buying JMSB?

As of Aug 28, 2026, SEC Form 4 filings show 2 open-market buys worth $57k by 2 insiders and 0 open-market sells worth $0 by 0 insiders at John Marshall Bancorp, Inc. in the last 90 days, net +$57k. Only purchases (code P) and sales (code S) count; grants, option exercises and tax withholding do not.

Who was the last insider to trade JMSB on the open market?

Philip Chase (director) bought $3,054 of JMSB on Aug 26, 2026 and filed the Form 4 on Aug 28, 2026. InsiderTell scored 18 (weak), with 2 insiders on the same side within 14 days.

How many insiders file Form 4 at John Marshall Bancorp, Inc.?

12 people have filed a Form 4 at John Marshall Bancorp, Inc., among them Philip W Allin (director), Christopher W Bergstrom (CHIEF EXECUTIVE OFFICER), Kelly Jo Bell (CHIEF OPERATING OFFICER). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

JMSB insider trading: John Marshall Bancorp, Inc. | InsiderTell