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United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

CHAIN BRIDGE BANCORP INC

CBNA · NYSE · CIK 0001392272 · Financial Services · Banks—Regional

INSIDER SIGNAL

42.1 / 100

1 buyers · 1 purchase transaction lines · $17.6K gross purchase

WHY THIS SIGNAL?

Buyer breadthLow
Purchase sizeLow
RoleStrong
RecencyLow
ConvictionStrong
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+7.0 / 35
Purchase size+2.5 / 25
Role+20.0 / 20
Recency+2.6 / 10
Conviction+10.0 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 1 insider(s), not 4+
  • ⚠ Purchase size is modest relative to the model scale
  • ⚠ Purchase activity is becoming less recent
  • ✓ Role scores high · most senior buyer: Director

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
MARTINELLI MARKDirector
●
● Purchase▼ Sale○ Other

—

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: MARTINELLI MARK · $17.6K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-07-29–2026-07-29

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

42.1 / 100

Latest recorded score

↓ -0.1 ptsversus the previous recorded snapshot
  1. 42.4
  2. 42.4
  3. 42.3
  4. 42.2
  5. 42.1

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

6Purchases
1Sales
7Other Form 4 lines
14SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER0 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
+5.5%
3M
+18.2%
6M
+37.6%
12M
+53.4%

Volatility & liquidity

Volatility
32.0%
Beta
—
Avg daily value
USD 1.0M

Valuation

Market cap
—
P/E
—

Fundamentals

Profit margin
—
ROE
12.0%
Industry
Banks—Regional

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: ROE · Fiscal year ended: 2025-12-31 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
162,939
Previous report
132,299
Avg daily volume
19,845
Days to cover
8.2

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-07-29MARTINELLI MARKPurchase (P)Class A Common Stock400USD 44.00USD 17,600SEC filing ↗
2026-03-06Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 35.04USD 14,016SEC filing ↗
2026-03-05Pollock James R.Purchase (P)Class A Common Stock714USD 35.25USD 25,168SEC filing ↗
2025-11-18Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 30.48USD 12,192SEC filing ↗
2025-11-18Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 30.48USD 12,192SEC filing ↗
2025-11-11MARTINELLI MARKPurchase (P)Class A Common Stock430USD 28.55USD 12,276SEC filing ↗
2025-08-29Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 29.81USD 11,924SEC filing ↗
2025-08-29Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 29.81USD 11,924SEC filing ↗
2025-06-29Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 29.97USD 11,988SEC filing ↗
2025-02-25Friedman Martin S.Purchase (P)Class A Common Stock8,514USD 24.13USD 205,443SEC filing ↗
2025-02-24Friedman Martin S.Purchase (P)Class A Common Stock16,194USD 24.46USD 396,105SEC filing ↗
2025-02-21Friedman Martin S.Purchase (P)Class A Common Stock1,088USD 24.49USD 26,645SEC filing ↗
2025-02-04Conover Michael J.Purchase (P)Class A Common Stock300USD 24.61USD 7,383SEC filing ↗
2025-02-03Conover Michael J.Purchase (P)Class A Common Stock700USD 24.75USD 17,325SEC filing ↗
2024-10-03Williamson Joanna R.Purchase (P)Class A Common Stock753USD 22.00USD 16,566SEC filing ↗

Form 4 evidence

14 transaction lines in the latest 365-day window; 41 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-07-29MARTINELLI MARKPurchase (P)Class A Common Stock400USD 44.00USD 17,600SEC filing ↗
2026-03-06Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 35.04USD 14,016SEC filing ↗
2026-03-05Pollock James R.Purchase (P)Class A Common Stock714USD 35.25USD 25,168SEC filing ↗
Show recent Form 4 evidence (14 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-07-29MARTINELLI MARKPurchase (P)Class A Common Stock400USD 44.00USD 17,600SEC filing ↗
2026-03-06Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 35.04USD 14,016SEC filing ↗
2026-03-05Pollock James R.Purchase (P)Class A Common Stock714USD 35.25USD 25,168SEC filing ↗
2026-03-03Thompson-Byas BenitaSale (S)Class A Common Stock2,000USD 35.44USD 70,880SEC filing ↗
2025-12-15Thompson-Byas BenitaC (C)Class A Common Stock18,020USD 36.46USD 657,009SEC filing ↗
2025-12-15Thompson-Byas BenitaC (C)Class A Common Stock18,020USD 36.46USD 657,009SEC filing ↗
2025-11-18Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 30.48USD 12,192SEC filing ↗
2025-11-18Basha Leigh-AlexandraPurchase (P)Class A Common Stock400USD 30.48USD 12,192SEC filing ↗
2025-11-17Fitzgerald Joseph MICHAELC (C)Class A Common Stock27,880USD 30.19USD 841,697SEC filing ↗
2025-11-17Fitzgerald Joseph MICHAELC (C)Class A Common Stock27,880USD 30.19USD 841,697SEC filing ↗
2025-11-11Martinelli MarkAward / grant (A)Class A Common Stock430USD 28.55USD 12,276SEC filing ↗
2025-11-11MARTINELLI MARKPurchase (P)Class A Common Stock430USD 28.55USD 12,276SEC filing ↗
2025-11-11MARTINELLI MARKAward / grant (A)Class A Common Stock430USD 28.55USD 12,276SEC filing ↗
2025-11-07Martinelli MarkC (C)Class A Common Stock170USD 29.93USD 5,088SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerCBNA
CIK0001392272
SectorFinancial Services
IndustryBanks—Regional Yahoo Finance
SEC SIC6021 National Commercial Banks
ExchangeNYSE

Data coverage

Local Form 4 history41 transaction lines from 2024-10-03 to 2026-07-29
28 P purchase lines · 2 S sale lines · 11 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.