As of the latest Form 4 filed Jun 17, 2026.
What Markel Corporation insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 23 most recent filings for MKL.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-17 | 2026-06-15 | Housel Morgan E. Director | JOther | +65.92 | $1,668.65 | $110K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Besca Mark Director | JOther | +80.90 | $1,668.65 | $135K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Cunningham Lawrence A Director | JOther | +32.96 | $1,668.65 | $55.0K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Leopold Diane Director | JOther | +65.92 | $1,668.65 | $110K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Puckett A. Lynne Director | JOther | +65.92 | $1,668.65 | $110K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Morrison Harold Lawrence Jr. Director | JOther | +32.96 | $1,668.65 | $55.0K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | OREILLY MICHAEL Director | JOther | +89.89 | $1,668.65 | $150K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | MICHAEL JONATHAN E Director | JOther | +65.92 | $1,668.65 | $110K | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Harris Greta J Director | SSale | −27.00 | $1,848.83 | $49.9K | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Harris Greta J, Director | SSale | −14.00 | $1,847.36 | $25.9K | No | Form 4 ↗ |
| 2026-05-27 | 2026-05-22 | Harris Greta J, Director | SSale | −35.00 | $1,846.12 | $64.6K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-07 | Leopold Diane Director | PPurchase | +50.00 | $1,789.19 | $89.5K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-06 | Leopold Diane, Director | PPurchase | +100.00 | $1,792.61 | $179K | No | Form 4 ↗ |
| 2026-05-05 | 2026-05-01 | Puckett A. Lynne Director | PPurchase | +57.00 | $1,795.53 | $102K | No | Form 4 ↗ |
| 2026-04-15 | 2026-03-31 | Crowley Andrew G. EVP & Pres., Markel Ventures | JOther | +9.22 | $1,626.96 | $15.0K | No | Form 4 ↗ |
| 2026-04-15 | 2026-03-31 | Costanzo Brian J. Chief Financial Officer | JOther | +1.84 | $1,626.96 | $3.00K | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-26 | Wilson Simon EVP and CEO, Markel Insurance | SSale | −100.00 | $2,079.48 | $208K | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | Wilson Simon, EVP and CEO, Markel Insurance | AAward | +868.12 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | Grandis Meade P. CAO and Controller | AAward | +69.72 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | Crowley Andrew G. EVP & Pres., Markel Ventures | AAward | +830.02 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | Costanzo Brian J. Chief Financial Officer | AAward | +654.64 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | Grinnan Richard Randolph SVP, Chief Legal Officer & Sec | AAward | +800.51 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | GAYNER THOMAS SINNICKSON Chief Executive Officer | AAward | +4.48K | $0.00 | $0.00 | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MKL’s full analysis or the market-wide insider trading feed. The tabs above jump to MKL’s other SEC data.
Source: SEC Form 4 filings for MKL, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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