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JMSB John Marshall Bancorp, Inc. Insider Trading

Latest: Director Bought $48K of Shares · Jun 2026

Multiple insiders have been active at John Marshall Bancorp, Inc. (JMSB): 5 distinct insiders account for 18 buy filings and 0 sell filings as of Jun 2026. Its highest-significance filing in the last 90 days: Director Jonathan Craig Kinney bought $48K, transaction dated Jun 2026.

18 filings analyzed · Latest 2026-06-05

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Buys
18
Sells
0
Insiders
5
Direction
Net buying

John Marshall Bancorp, Inc. leadership

CEO
Christopher W. Bergstrom — PRINCIPAL EXECUTIVE OFFICER
CFO
Kent D. Carstater — PRINCIPAL FINANCIAL OFFICER
Chair
Jonathan C. Kinney — Chairman of the Board

Historically, high-priority insider buys have outperformed the S&P 500 by a median ~2% over the 30 days after the trade — the edge is concentrated in that first month (n ≈ 5,579, 2024-2026). Past results don't predict the future. How we measure this ↗

June 2026
2026-06-05
high
2,300 shares
$48,369
@ $21.03
Significance 7

Director Jonathan Craig Kinney buys 2,300 shares at $21.03 in two transactions; aligns with strong prior timing pattern at JMSB.

Jonathan Craig Kinney, Director at John Marshall Bancorp, executed two separate purchases totaling 2,300 shares for $48,369.00 at $21.03 on 2026-06-03, bringing his holdings from 276,388 to 278,688 shares. His cross-ticker track record shows 20 prior buys with a 95.00% 90-day win rate and average 90d return of +11.8%. At JMSB specifically, his timing has been notably successful: 4 of 5 prior buy transactions posted positive 90-day returns, ranging from +1.8% to +12.2%. The stock currently trades at $21.65, near its 52-week high of $22.10, with positive 30-day (+1.1%) and 90-day (+11.0%) momentum. The company carries a P/E of 13.53 on net income of $6,101,000.00, suggesting a stable valuation backdrop. Kinney's continued accumulation, combined with his demonstrated accuracy in timing purchases at this ticker, warrants attention as a potential signal of management confidence.

December 2025
2025-12-08
medium
500 shares
$9,815
@ $19.63
Significance 5

Director Jonathan Craig Kinney bought 500 JMSB shares at $19.63; stock now $20.00, down 13.2% from 52-week high.

Director Jonathan Craig Kinney purchased 500 shares of John Marshall Bancorp at $19.63 on 2025-12-05, adding to his position of 325.7K shares post-transaction. This buy occurs as the stock trades at $20.00, positioned 13.2% below its 52-week high of $23.05 and down 2.9% over 30 days. Kinney's cross-ticker track record shows 20 prior buys with an average 90-day return of +15.3% and a 100.00% win rate, suggesting a pattern of favorable entry timing elsewhere; however, his same-ticker history at JMSB remains early-stage, with prior November buys showing modest 30-day gains (3.5% to 4.6%) but no measurable 90-day outcomes yet. The modest transaction size ($9,815.00 on a 325.7K-share position) and stock price action suggest this represents incremental accumulation during a period of recent weakness rather than a concentrated conviction signal.

2025-12-04
medium
1,345 shares
$26,003
@ $19.33
Significance 5

Director Kinney buys 1,345 shares at $19.30–$19.40; now holds 325.2K shares in JMSB after five recent buys.

Kinney Jonathan Craig, a director at John Marshall Bancorp, executed 2 separate purchases on 2025-12-02 totaling 1,345 shares for $26,003.00 at a blended average price of $19.33, expanding his holdings to 325.2K shares. This represents his fifth purchase at JMSB in less than a month (buys on 2025-10-31, 2025-11-04, 2025-11-05 twice, and 2025-11-06), suggesting sustained accumulation at the ticker. His cross-ticker track record shows 20 prior buys with an average 90d return of +16.1% and a 100.00% win rate, though JMSB-specific outcomes remain largely unmeasured (five trades initiated recently with 30d outcomes ranging from +5.5% to +6.1% for the two tradable dates, and three trades still in their information window). The current price of $20.00 sits 13.2% below the 52-week high of $23.05, and the stock has risen 5.7% over the prior 30 days. This pattern indicates sustained director confidence in the valuation and trajectory of JMSB, though the frequency and recency of purchases warrant attention to whether a broader strategic opportunity or routine accumulation is underway.

November 2025
2025-11-10
high
500 shares
$9,450
@ $18.90
Significance 6

Director Kinney Jonathan Craig bought 500 shares of JMSB at $18.90, his 5th purchase in 7 days; track record: 93.75% win rate across 20 prior buys.

Kinney Jonathan Craig, a director, purchased 500 shares on 2025-11-06 at $18.90, extending a burst of acquisitions—this marks his 5th buy in as many days (starting 2025-10-31), adding to holdings of 323.8K shares. His cross-ticker track record demonstrates strong execution: 20 prior open-market buys with a 93.75% 90-day win rate and average 90-day return of +14.9%, providing context for his accumulation pattern. At JMSB specifically, his prior measured buy from 2025-06-12 returned +16.4% over 90 days. The current price of $19.40 is -25.3% from the 52-week high of $25.98, and the stock has risen 4.2% over the past 30 days despite the near-term weakness. The concentration of purchases in a single week merits observation of whether subsequent price action aligns with his historical pattern of positive returns.

2025-11-03
high
500 shares
$9,425
@ $18.85
Significance 7

Director Kinney Jonathan Craig bought 500 JMSB shares at $18.85; prior 5 same-ticker buys showed 90d win rate of 5/5.

Jonathan Craig, a Director of John Marshall Bancorp, purchased 500 shares at $18.85, bringing his holdings to 322,107 shares. This buy follows a striking pattern: all 5 of his prior trades at JMSB were timed favorably, with each resulting in positive 90-day returns ranging from 12.3% to 16.4%. His cross-ticker track record across 20 prior buys also shows a 75.00% 90-day win rate with an average 90d return of +11.2%. The current stock price of $19.01 sits 26.8% below the 52-week high of $25.98, placing this purchase near a valley in recent price action. The persistent pattern of well-timed accumulation at JMSB, combined with a director-level position and fundamental metrics showing a P/E of 14.29 on $5.1M net income, suggests deliberate conviction in the company's value at current levels.

August 2025
2025-08-01
high
CHIEF FINANCIAL OFFICER
5,000 shares
$92,156
@ $18.43
Significance 7

CFO Kent purchases 5,000 shares of JMSB at blended average $18.43; post-transaction holdings 53.1K shares (+10.4%). Prior buys at this ticker consistently positive.

Carstater Kent, Chief Financial Officer of John Marshall Bancorp, executed 10 separate purchase transactions totaling 5,000 shares for $92,155.94 on 2025-07-31 at a blended average price of $18.43. The current price of $18.42 sits at -29.1% from the 52-week high of $25.98. Notably, Kent's prior 5 purchases at JMSB (all on 2025-04-25) exhibited consistent positive timing: all five delivered 90-day returns ranging from +19.3% to +20.9%, with a 100% win rate at the 90-day mark. His cross-ticker track record across 7 prior open-market buys shows an average 90-day return of +20.3% with a 100% win rate. The company's fundamentals show a P/E of 14.85 and market cap of $263,006,949.12. This filing demonstrates a sustained pattern of discretionary buying by the CFO with a measurable prior success rate at this specific ticker.

July 2025
2025-07-31
medium
6,162 shares
$118,310
@ $19.20
Significance 6

Director Garcia buys 6,162 shares of JMSB at $19.20; third consecutive daily buy, shares now at $18.41

Michael A Garcia, a director of John Marshall Bancorp, Inc., purchased 6,162 shares at $19.20 on July 30, 2025, bringing his holdings to 34,372 shares, a 21.8% increase from pre-transaction holdings of 28,210 shares. This transaction is notable because Garcia has executed three separate purchases at JMSB over consecutive days (July 28, 28, and 29), suggesting sustained accumulation activity in a narrow timeframe. The stock now trades at $18.41, approximately 4.1% below the transaction price, and sits 29.1% below its 52-week high of $25.98, placing the purchase near the lower end of the annual range. The company's valuation appears modest at a P/E of 14.85 with net income of $4,810,000.00 and a market cap of $262,864,165.76, though the pattern of rapid consecutive purchases warrants observation given the recent price weakness and the timing uncertainty around whether these acquisitions represent forward-looking conviction or are driven by other factors not apparent from the filing alone.

2025-07-30
medium
7,023 shares
$134,607
@ $19.17
Significance 6

JMSB Director Garcia buys 7,023 shares across 3 transactions for $134,607.24 at blended avg $19.17

Director Michael A. Garcia executed 3 separate purchases totaling 7,023 shares for $134,607.24 on July 28–29, 2025, at an average price of $19.17—above the current price of $18.60. This purchase increased his holdings by +33.1% from 21,187 to 28,210 shares. The stock is currently -28.4% below its 52-week high of $25.98 and has risen 9.4% over the past 90 days. Garcia's cross-ticker track record shows only 1 prior open-market buy, with no measurable same-ticker history prior to this filing, limiting visibility into his trading pattern at JMSB. The company carries a P/E of 15.00 and market cap of $265,577,049.60.

2025-07-17
low
712 shares
$13,265
@ $18.63
Significance 4

Director Mahan Oscar Leland buys 712 JMSB shares at $18.63; stock up 33.4% in 90 days but insider's cross-ticker buys historically return -19.0% at 90 days.

Director Mahan Oscar Leland purchased 712 shares of John Marshall Bancorp at $18.63 on 2025-07-15, adding to a 92.9K-share position. The timing follows a sharp 90-day rebound of +33.4% from prior lows, occurring when the stock is -25.9% from its 52-week high. Critically, his cross-ticker track record shows 1 prior buy with an average 90-day return of -19.0% and a 0% win rate, suggesting his buy decisions have historically underperformed. By contrast, his 19 prior sells across all tickers posted a 100% well-timed rate at the 90-day mark, indicating he has been far more reliable at identifying exit points than entry points. At JMSB specifically, his 5 prior trades in 2024 were all sells, each well-timed with negative 90-day returns ranging from -17.8% to -18.2%, yet this purchase represents his first buy at this ticker, contrasting sharply with his established pattern of selling here.

June 2025
2025-06-13
medium
900 shares
$15,668
@ $17.41
Significance 4

Director Kinney buys 900 shares of JMSB at blended $17.41 across 2 transactions; stock now $17.08, near 52-week low

Jonathan Craig Kinney, a director of John Marshall Bancorp, executed 2 separate purchases totaling 900 shares for $15,668.00, increasing his holdings to 321,607 shares. The purchases occurred at $17.58 on 2025-06-11 and $17.36 on 2025-06-12, with a blended average price of $17.41. The current stock price of $17.08 is -34.3% from the 52-week high of $25.98 and near the low end of the 52-week range, while the 30-day change is -3.2%. Notably, Kinney executed five distinct buy transactions within the same week (2025-06-02 through 2025-06-06 prior, plus this filing's purchases), suggesting a pattern of accumulation during a period of price pressure, though timing outcomes on his same-ticker history are not yet measurable and his broader cross-ticker track record shows a modest 28.57% 90-day win rate on prior buys.

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