Markel Corporation (MKL) Insider Trading

Over the last 3 months, MKL insiders made 3 open-market buys and 3 sales, a net purchase of $231K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 628 institutions increased and 618 reduced their position (13F).

Insider Activity

Sentiment
73/100
Buys (3m)
3
Sells (3m)
3
Net (3m)
$230.7K
Insiders buyingCluster buying
Insider trades by month Buys Sells
May
Aug
Nov
Dec
Feb
May
Context3-month price -12.9%Institutions mixed (13F)
DateInsiderTypeSharesPrice
May 27, 2026Harris Greta JdirectorSell27$1848.83
May 27, 2026Harris Greta JdirectorSell35$1846.12
May 27, 2026Harris Greta JdirectorSell14$1847.36
May 22, 2026Morrison Harold Lawrence Jr.directorGrant89
May 22, 2026Housel Morgan E.directorGrant89
May 22, 2026Besca MarkdirectorGrant89
May 22, 2026Cunningham Lawrence AdirectorGrant89
May 22, 2026Leopold DianedirectorGrant89
May 22, 2026Harris Greta JdirectorGrant89
May 22, 2026MICHAEL JONATHAN EdirectorGrant89
May 22, 2026OREILLY MICHAELdirectorGrant89
May 22, 2026Puckett A. LynnedirectorGrant89
May 19, 2026GAYNER THOMAS SINNICKSONdirector, officer: Chief Executive OfficerTax482$1844.00
May 19, 2026Costanzo Brian J.officer: Chief Financial OfficerTax13$1844.00
May 19, 2026Grinnan Richard Randolphofficer: SVP, Chief Legal Officer & SecTax116$1844.00
May 19, 2026Crowley Andrew G.officer: EVP & Pres., Markel VenturesTax75$1844.00
May 8, 2026Leopold DianedirectorBuy50$1789.19
May 8, 2026Leopold DianedirectorBuy100$1792.61
May 5, 2026Puckett A. LynnedirectorBuy57$1795.53
Feb 26, 2026GAYNER THOMAS SINNICKSONdirector, officer: Chief Executive OfficerGrant4,484
Feb 26, 2026Grinnan Richard Randolphofficer: SVP, Chief Legal Officer & SecGrant801
Feb 26, 2026Costanzo Brian J.officer: Chief Financial OfficerGrant655
Feb 26, 2026Grandis Meade P.officer: CAO and ControllerGrant70
Feb 26, 2026Wilson Simonofficer: EVP and CEO, Markel InsuranceGrant868
Feb 26, 2026Crowley Andrew G.officer: EVP & Pres., Markel VenturesGrant830
Feb 26, 2026Wilson Simonofficer: EVP and CEO, Markel InsuranceSell100$2079.48
Feb 19, 2026Wilson Simonofficer: CEO, Markel InsuranceTax47$2084.46
Dec 15, 2025MARKEL STEVEN AdirectorSell70$2108.27
Dec 15, 2025MARKEL STEVEN AdirectorSell50$2103.55
Dec 15, 2025MARKEL STEVEN AdirectorSell64$2100.00

Source: MKL SEC Form 4 filings, latest May 27, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their MKL positions over the last 6 months (SEC Form 13F).

Increased
628
New positions
208
Reduced
618
Sold out
136
Largest moves
InstitutionActionSharesFiled
VANGUARD GROUP INCReduced1.2MJan 29, 2026
BLACKROCK, INC.Reduced711KFeb 12, 2026
BLACKROCK, INC.Reduced711KMay 13, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position545KMay 15, 2026
PRINCIPAL FINANCIAL GROUP INCReduced533KFeb 2, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position524KMay 8, 2026
SELECT EQUITY GROUP, L.P.Increased428KFeb 17, 2026
DAVIS SELECTED ADVISERSIncreased415KFeb 2, 2026
PRINCIPAL FINANCIAL GROUP INCReduced402KMay 4, 2026
MORGAN STANLEYReduced392KFeb 13, 2026
DAVIS SELECTED ADVISERSReduced383KMay 7, 2026
SELECT EQUITY GROUP, L.P.Reduced378KMay 15, 2026
DAVIS SELECTED ADVISERSIncreased374KDec 29, 2025
MORGAN STANLEYReduced357KMay 15, 2026
STATE STREET CORPIncreased307KMay 15, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.