MKL (Markel Group Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by MKL officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-16 | Brian J. Costanzo | Chief Financial Officer | J | — | — |
| 2026-07-16 | Andrew G. Crowley | EVP & Pres., Markel Ventures | J | — | — |
| 2026-06-17 | JONATHAN E MICHAEL | Director | J | — | — |
| 2026-06-17 | MICHAEL OREILLY | Director | J | — | — |
| 2026-06-17 | Morgan E. Housel | Director | J | — | — |
| 2026-06-17 | Harold Lawrence Morrison Jr. | Director | J | — | — |
| 2026-06-17 | Mark Besca | Director | J | — | — |
| 2026-06-17 | A. Lynne Puckett | Director | J | — | — |
| 2026-06-17 | Diane Leopold | Director | J | — | — |
| 2026-06-17 | Lawrence A Cunningham | Director | J | — | — |
| 2026-05-27 | Greta J Harris | Director | Sell | — | — |
| 2026-05-22 | Diane Leopold | Director | A | — | — |
| 2026-05-22 | A. Lynne Puckett | Director | A | — | — |
| 2026-05-22 | Morgan E. Housel | Director | A | — | — |
| 2026-05-22 | MICHAEL OREILLY | Director | A | — | — |
| 2026-05-22 | Lawrence A Cunningham | Director | A | — | — |
| 2026-05-22 | Greta J Harris | Director | A | — | — |
| 2026-05-22 | Mark Besca | Director | A | — | — |
| 2026-05-22 | Harold Lawrence Morrison Jr. | Director | A | — | — |
| 2026-05-22 | JONATHAN E MICHAEL | Director | A | — | — |
| 2026-05-19 | Brian J. Costanzo | Chief Financial Officer | MIXED | — | — |
| 2026-05-19 | Andrew G. Crowley | EVP & Pres., Markel Ventures | MIXED | — | — |
| 2026-05-19 | Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | F | — | — |
| 2026-05-19 | THOMAS SINNICKSON GAYNER | Chief Executive Officer | F | — | — |
| 2026-05-08 | Diane Leopold | Director | Buy | — | — |
| 2026-05-05 | A. Lynne Puckett | Director | Buy | — | — |
| 2026-04-15 | Brian J. Costanzo | Chief Financial Officer | J | — | — |
| 2026-04-15 | Andrew G. Crowley | EVP & Pres., Markel Ventures | J | — | — |
| 2026-02-26 | Simon Wilson | EVP and CEO, Markel Insurance | MIXED | — | — |
| 2026-02-26 | THOMAS SINNICKSON GAYNER | Chief Executive Officer | A | — | — |
| 2026-02-26 | Meade P. Grandis | CAO and Controller | A | — | — |
| 2026-02-26 | Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | A | — | — |
| 2026-02-26 | Andrew G. Crowley | EVP & Pres., Markel Ventures | A | — | — |
| 2026-02-26 | Brian J. Costanzo | Chief Financial Officer | A | — | — |
| 2026-02-19 | Simon Wilson | CEO, Markel Insurance | F | — | — |
| 2026-01-20 | Brian J. Costanzo | Chief Financial Officer | J | — | — |
| 2025-12-15 | STEVEN A MARKEL | Director | Sell | — | — |
| 2025-12-03 | Brian J. Costanzo | Chief Financial Officer | F | — | — |
| 2025-12-03 | Andrew G. Crowley | President, Markel Ventures | F | — | — |
| 2025-12-03 | Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | F | — | — |
| 2025-12-03 | Michael R Heaton | EVP & Chief Operating Officer | F | — | — |
| 2025-12-03 | Simon Wilson | CEO, Markel Insurance | F | — | — |
| 2025-12-03 | THOMAS SINNICKSON GAYNER | Chief Executive Officer | F | — | — |
| 2025-12-01 | STEVEN A MARKEL | Director | Sell | — | — |
| 2025-11-25 | Simon Wilson | CEO, Markel Insurance | Sell | — | — |
| 2025-11-18 | STEVEN A MARKEL | Director | G | — | — |
| 2025-10-16 | Brian J. Costanzo | Chief Financial Officer | J | — | — |
| 2025-08-27 | Meade P. Grandis | CAO and Controller | Sell | — | — |
| 2025-07-16 | Brian J. Costanzo | Chief Financial Officer | J | — | — |
| 2025-07-16 | Andrew G. Crowley | President, Markel Ventures | J | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 62,558 | — |
| — | Chief Executive Officer | 56,682 | — |
| — | Executive Chairman | 20,739 | — |
| — | Director | 18,440 | — |
| — | Director | 17,443 | — |
| — | EVP & Chief Underwriting Off. | 15,809 | — |
| — | Co-Chief Executive Officer | 13,970 | — |
| — | Chief Administrative Officer | 13,515 | — |
| — | Pres/Chief Admin Off-Ins Ops | 8,675 | — |
| — | Director | 6,489 | — |
| — | Vice Chairman | 5,929 | — |
| — | Director | 5,740 | — |
| — | Exec Vice President and CFO | 5,264 | — |
| — | President, Insurance | 5,129 | — |
| — | Director | 5,039 | — |
| — | EVP & Chief Operating Officer | 4,869 | — |
| — | SVP, Chief Legal Officer & Sec | 4,267 | — |
| — | Director | 4,128 | — |
| — | Director | 3,934 | — |
| — | Director | 3,882 | — |
| — | EVP & Pres., Markel Ventures | 2,955 | — |
| — | Director | 2,895 | — |
| — | Chief Accounting Officer | 2,661 | — |
| — | EVP and CEO, Markel Insurance | 2,496 | — |
| — | Director | 2,411 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MKL quote page; the site-wide leaderboard is on the insider transactions hub.