INSIDER
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Data sources

Public disclosures only. Scores flag unusual patterns and are not evidence of wrongdoing. Not investment advice.

RH CHAIN…
OverviewFollow the MoneyDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
01Overview02Follow the Money03Daily Brief04Live05Congress06Corporate Insiders07Government Money08Political Influence09Institutions10Washington Network11Follow the Power12Disclosure Clock13AI Investigator14Watchlist
ConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
OverviewFollow the MoneyDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
Data sources
SEC FORM 42h ago
HOUSE PTR2h ago
SEC 13F2h ago
ROBINHOOD CHAIN2h ago
Corporate insider
CJ

Costanzo Brian J.

Chief Financial OfficerCIK 0001873434

EDGAR filingsOpen in network
Disclosed transactions2
Buys / sells0 / 0
Max Insider Score22
Connections1with evidence

Disclosed transactions

ScoreActorSecuritySideValueExecutedDisclosedLagSourceEvidence
22
CJ
Costanzo Brian J.Chief Financial Officer
MKLMARKEL GROUP INC.
Other acquisition or disposition
J$3,000
2 sh
Sep 30, 2026Oct 16, 2026
traded Sep 30, 2026
+16dSEC FORM 4

Evidence

Verified connections

  • Insider ofevidence
    MARKEL GROUP INC.Chief Financial Officer · Apr 15, 2026
22
CJ
Costanzo Brian J.Chief Financial Officer
MKLMARKEL GROUP INC.
Other acquisition or disposition
J
$3,000
2 sh
Mar 31, 2026
Apr 15, 2026
traded Mar 31, 2026
+15d
SEC FORM 4

Evidence