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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 458m ago
HOUSE PTR58m ago
SEC 13F58m ago
ROBINHOOD CHAIN58m ago
SEC FORM 4/Other acquisition or dispositionVerified data

Costanzo Brian J. reported MKL

Chief Financial Officer · MARKEL GROUP INC. · Common Stock

Side
J
Value
$3,000
Shares
1.84
Price
$1,626.96
Executed
Mar 31, 2026
Disclosed
Apr 15, 2026
Disclosure timeline15 days from execution to publication · legal deadline 2 business days
Mar 31 executedApr 15, 2026 disclosed

MKL · daily

Yahoo Finance chart API
▲Execution▼Disclosure●Material company filing●Other disclosed buy●Other disclosed sellUnofficial public endpoint; daily OHLCV, split-adjusted. Replace with a licensed feed for production.

Insider Score

Experimental signal
22/ 100 · ROUTINE
Methodology →
  • Transaction type+3 / 20

    Other acquisition or disposition

  • Relative size+1 / 25

    $3K reported value · 0.1% of prior position

  • Filing timing+10 / 15

    Disclosed 11 business days after execution (deadline: 2)

  • Historical behavior+8 / 15

    First recorded trade by this actor in this security

  • Frequency & clustering0 / 15

    No clustered activity in the dataset

  • Market events0 / 10

    No material company filing within 60 days after the trade

    • The Insider Score measures how far a disclosure deviates from normal filing patterns. A high score is a prompt for research, not evidence of illegal insider trading.

    Other disclosed activity · MKL

    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

    23
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Sale
    		SELL$100K – $250KAug 25, 2026Sep 9, 2026
    traded Aug 25, 2026
    		+15dHOUSE PTR

    Evidence

    16
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$1,001 – $15KJul 28, 2026Aug 3, 2026
    traded Jul 28, 2026
    		+6dHOUSE PTR

    Evidence

    16
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$1,001 – $15KJul 27, 2026Aug 3, 2026
    traded Jul 27, 2026
    		+7dHOUSE PTR

    Evidence

    27
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$1,001 – $15KJul 24, 2026Aug 3, 2026
    traded Jul 24, 2026
    		+10dHOUSE PTR

    Evidence

    16
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$1,001 – $15KJul 29, 2026Aug 3, 2026
    traded Jul 29, 2026
    		+5dHOUSE PTR

    Evidence

    16
    Thomas H. Kean, Jr.RSelf
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$1,001 – $15KJun 29, 2026Jul 15, 2026
    traded Jun 29, 2026
    		+16dHOUSE PTR

    Evidence

    20
    Thomas H. Kean, Jr.RSelf
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$1,001 – $15KJun 2, 2026Jul 15, 2026
    traded Jun 2, 2026
    		+43dHOUSE PTR

    Evidence

    24
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Purchase
    		BUY$1,001 – $15KMay 1, 2026Jun 5, 2026
    traded May 1, 2026
    		+35dHOUSE PTR

    Evidence

    24
    April McClain DelaneyDDependent child
    MKLMARKEL GROUP INC.
    Purchase
    		BUY$1,001 – $15KApr 30, 2026May 6, 2026
    traded Apr 30, 2026
    		+6dHOUSE PTR

    Evidence

    22
    CG
    Crowley Andrew G.EVP & Pres., Markel Ventures
    MKLMARKEL GROUP INC.
    Other acquisition or disposition
    		J$15K
    9 sh
    		Mar 31, 2026Apr 15, 2026
    traded Mar 31, 2026
    		+15dSEC FORM 4

    Evidence

    20
    WS
    Wilson SimonEVP and CEO, Markel Insurance
    MKLMARKEL GROUP INC.
    Open-market sale
    		SELL$208K
    100 sh
    		Feb 26, 2026Feb 26, 2026
    traded Feb 26, 2026
    		+0dSEC FORM 4

    Evidence

    17
    WS
    Wilson SimonEVP and CEO, Markel Insurance
    MKLMARKEL GROUP INC.
    Grant or award
    		A—
    868 sh
    		Feb 24, 2026Feb 26, 2026
    traded Feb 24, 2026
    		+2dSEC FORM 4

    Evidence

    17
    GP
    Grandis Meade P.CAO and Controller
    MKLMARKEL GROUP INC.
    Grant or award
    		A—
    70 sh
    		Feb 24, 2026Feb 26, 2026
    traded Feb 24, 2026
    		+2dSEC FORM 4

    Evidence

    8
    WS
    Wilson SimonCEO, Markel Insurance
    MKLMARKEL GROUP INC.
    Tax withholding
    		F$98K
    47 sh
    		Feb 17, 2026Feb 19, 2026
    traded Feb 17, 2026
    		+2dSEC FORM 4

    Evidence

    24
    Thomas H. Kean, Jr.RSelf
    MKLMARKEL GROUP INC.
    Partial sale
    		SELL$15K – $50KJan 23, 2026Feb 19, 2026
    traded Jan 23, 2026
    		+27dHOUSE PTR

    Evidence

    12
    WS
    Wilson SimonCEO, Markel Insurance
    MKLMARKEL GROUP INC.
    Tax withholding
    		F$194K
    94 sh
    		Dec 2, 2025Dec 3, 2025
    traded Dec 2, 2025
    		+1dSEC FORM 4

    Evidence

    24
    WS
    Wilson SimonCEO, Markel Insurance
    MKLMARKEL GROUP INC.
    Open-market sale
    		SELL$155K
    75 sh
    		Nov 25, 2025Nov 25, 2025
    traded Nov 25, 2025
    		+0dSEC FORM 4

    Evidence

    Evidence

    Verified data

    Read directly from the primary public document; every field below is as reported by the filer.

    Source

    Document
    SEC Form 4
    Publisher
    U.S. Securities and Exchange Commission (EDGAR)
    Document ID
    0001873434-26-000004
    Machine-readable
    Structured copy

    Timestamps

    Event (reported)
    Mar 31, 2026
    Published
    Apr 15, 2026
    Ingested by INSIDER
    Nov 5, 04:04 UTC
    Last re-read
    Nov 5, 04:04 UTC

    Extracted facts

    Filer
    Costanzo Brian J.
    Role
    Chief Financial Officer
    Transaction
    Other acquisition or dispositionAs filed: “J”
    Asset
    MARKEL GROUP INC.
    Ticker
    MKL
    Shares
    1.84
    Price per share
    $1,626.96
    Value
    $3,000
    Execution date (reported)
    Mar 31, 2026
    Owned after transaction
    1,613 shares
    Days from execution to publication
    15

    Calculation

    Value = shares × reported price per share

    • Shares: 1.84
    • Price: $1,626.96

    = $3,000

    What this establishes

    Costanzo Brian J. filed this Form 4 reporting a other acquisition or disposition of MKL on Mar 31, 2026. It became public on Apr 15, 2026. The filing establishes the reported transaction and the filer's stated role. It does not establish why the trade was made or what the filer knew.

    Extraction

    Method
    Form 4 XML
    Confidence
    1.00
    Chief Financial Officer
    Costanzo Brian J.cik:0001873434
    Issuer
    MARKEL GROUP INC.cik:0001096343

    Revision history · 0

    No field has changed since this record was first ingested.

    Company events

    No records

    No material filings recorded for this issuer.