There have been 50 recent insider transactions recorded for Markel Corporation (MKL), including 32 buys and 16 sells. Total insider buying was valued at $979.88K and total insider selling at $4.09M.
Notable insiders with recent activity include Wilson Simon, Gayner Thomas Sinnickson, Grinnan Richard Randolph. Insider transactions can provide insights into how company leadership views the stock's valuation and future prospects.
Insider Transactions — MKL
| Date |
Name |
Role |
Transaction |
Shares |
Avg. Price |
Value |
Shares Owned |
| 2026-02-26 |
Wilson Simon |
EVP and CEO, Markel Insurance |
Informative Sell |
100 |
$2,079.48 |
$207.95K |
2,397 |
| 2026-02-24 |
Gayner Thomas Sinnickson |
Chief Executive Officer |
RSU Award |
4,484 |
- |
- |
56,741 |
| 2026-02-24 |
Grinnan Richard Randolph |
SVP, Chief Legal Officer & Sec |
RSU Award |
801 |
- |
- |
4,263 |
| 2026-02-24 |
Costanzo Brian J. |
Chief Financial Officer |
RSU Award |
655 |
- |
- |
1,611 |
| 2026-02-24 |
Crowley Andrew G. |
EVP & Pres., Markel Ventures |
RSU Award |
830 |
- |
- |
2,744 |
| 2026-02-24 |
Grandis Meade P. |
CAO and Controller |
RSU Award |
70 |
- |
- |
294 |
| 2026-02-24 |
Wilson Simon |
EVP and CEO, Markel Insurance |
RSU Award |
868 |
- |
- |
2,497 |
| 2026-02-17 |
Wilson Simon |
CEO, Markel Insurance |
Tax Withholding of RSU |
47 |
$2,084.46 |
$97.97K |
1,629 |
| 2025-12-31 |
Costanzo Brian J. |
Chief Financial Officer |
Other (Buy) |
2 |
$1,602.62 |
$3.21K |
957 |
| 2025-12-11 |
Markel Steven A |
Director |
Informative Sell |
120 |
$2,129.98 |
$255.6K |
60,368 |
| 2025-12-02 |
Gayner Thomas Sinnickson |
Chief Executive Officer |
Tax Withholding of RSU |
37 |
$2,060.83 |
$76.25K |
52,258 |
| 2025-12-02 |
Grinnan Richard Randolph |
SVP, Chief Legal Officer & Sec |
Tax Withholding of RSU |
138 |
$2,060.83 |
$284.39K |
3,463 |
| 2025-12-02 |
Heaton Michael R |
EVP & Chief Operating Officer |
Tax Withholding of RSU |
217 |
$2,060.83 |
$447.2K |
4,709 |
| 2025-12-02 |
Costanzo Brian J. |
Chief Financial Officer |
Tax Withholding of RSU |
22 |
$2,060.83 |
$45.34K |
954 |
| 2025-12-02 |
Crowley Andrew G. |
President, Markel Ventures |
Tax Withholding of RSU |
65 |
$2,060.83 |
$133.95K |
1,914 |
| 2025-12-02 |
Wilson Simon |
CEO, Markel Insurance |
Tax Withholding of RSU |
94 |
$2,060.83 |
$193.72K |
1,676 |
| 2025-11-28 |
Markel Steven A |
Director |
Informative Sell |
100 |
$2,100.00 |
$210K |
61,698 |
| 2025-11-26 |
Markel Steven A |
Director |
Informative Sell |
70 |
$2,100.00 |
$147K |
61,798 |
| 2025-11-25 |
Wilson Simon |
CEO, Markel Insurance |
Informative Sell |
75 |
$2,072.94 |
$155.47K |
1,770 |
| 2025-11-17 |
Markel Steven A |
Director |
Gift (Given) |
500 |
- |
- |
61,868 |
| 2025-09-30 |
Costanzo Brian J. |
Chief Financial Officer |
Other (Buy) |
2 |
$1,624.66 |
$3.25K |
976 |
| 2025-08-25 |
Grandis Meade P. |
CAO and Controller |
Informative Sell |
75 |
$1,983.78 |
$148.78K |
275 |
| 2025-07-15 |
Crowley Andrew G. |
President, Markel Ventures |
Other (Buy) |
6 |
$1,779.25 |
$10.68K |
1,978 |
| 2025-06-30 |
Costanzo Brian J. |
Chief Financial Officer |
Other (Buy) |
2 |
$1,580.87 |
$3.16K |
974 |
| 2025-06-13 |
Michael Jonathan E |
Director |
Other (Buy) |
63 |
$1,735.89 |
$109.36K |
178 |
| 2025-06-13 |
Oreilly Michael |
Director |
Other (Buy) |
81 |
$1,735.89 |
$140.61K |
3,756 |
| 2025-06-13 |
Morrison Harold Lawrence Jr. |
Director |
Other (Buy) |
32 |
$1,735.89 |
$55.55K |
1,005 |
| 2025-06-13 |
Puckett A. Lynne |
Director |
Other (Buy) |
63 |
$1,735.89 |
$109.36K |
352 |
| 2025-06-13 |
Leopold Diane |
Director |
Other (Buy) |
63 |
$1,735.89 |
$109.36K |
2,090 |
| 2025-06-13 |
Cunningham Lawrence A |
Director |
Other (Buy) |
63 |
$1,735.89 |
$109.36K |
920 |
| 2025-06-13 |
Housel Morgan E. |
Director |
Other (Buy) |
63 |
$1,735.89 |
$109.36K |
874 |
| 2025-06-13 |
Crowley Andrew G. |
President, Markel Ventures |
Other (Buy) |
9 |
$1,735.89 |
$15.62K |
1,973 |
| 2025-05-23 |
Harris Greta J |
Director |
Informative Sell |
90 |
$1,861.44 |
$167.53K |
632 |
| 2025-05-22 |
Cunningham Lawrence A |
Director |
Informative Buy |
15 |
$1,849.00 |
$27.74K |
846 |
| 2025-05-21 |
Michael Jonathan E |
Director |
RSU Award |
88 |
- |
- |
114 |
| 2025-05-21 |
Oreilly Michael |
Director |
RSU Award |
88 |
- |
- |
3,675 |
| 2025-05-21 |
Morrison Harold Lawrence Jr. |
Director |
RSU Award |
88 |
- |
- |
973 |
| 2025-05-21 |
Puckett A. Lynne |
Director |
RSU Award |
88 |
- |
- |
735 |
| 2025-05-21 |
Leopold Diane |
Director |
RSU Award |
88 |
- |
- |
2,027 |
| 2025-05-21 |
Cunningham Lawrence A |
Director |
RSU Award |
88 |
- |
- |
831 |
| 2025-05-21 |
Besca Mark |
Director |
RSU Award |
88 |
- |
- |
1,052 |
| 2025-05-21 |
Harris Greta J |
Director |
RSU Award |
88 |
- |
- |
722 |
| 2025-05-21 |
Housel Morgan E. |
Director |
RSU Award |
88 |
- |
- |
811 |
| 2025-05-19 |
Markel Steven A |
Director |
Gift (Given) |
300 |
- |
- |
62,368 |
| 2025-05-19 |
Grandis Meade P. |
CAO and Controller |
Informative Sell |
400 |
$1,911.65 |
$764.66K |
3,920 |
| 2025-05-15 |
Heaton Michael R |
EVP & Chief Operating Officer |
Other (Buy) |
88 |
$1,710.30 |
$150.51K |
4,926 |
| 2025-05-15 |
Crowley Andrew G. |
President, Markel Ventures |
Other (Buy) |
3 |
$1,710.30 |
$5.13K |
1,964 |
| 2025-05-15 |
Wilson Simon |
CEO, Markel Insurance |
Other (Buy) |
- |
$1,710.30 |
- |
1,845 |
| 2025-05-05 |
Grandis Meade P. |
CAO and Controller |
Informative Sell |
400 |
$1,877.44 |
$750.98K |
4,320 |
| 2025-04-15 |
Michael Jonathan E |
Director |
Other (Buy) |
11 |
$1,602.95 |
$17.63K |
26 |
■ Informative Buy/Sell — open market transaction (most significant)
■ Uninformative Buy — award, option exercise, conversion
■ Uninformative Sell — tax withholding, award vest sale
■ Neutral — gift, trust, expiry
