MKL · Insider Trading
Markel Group Inc.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-16 | Brian J. Costanzo | Chief Financial Officer | J | +2 | +$3.00K |
| 2026-07-16 | Brian J. Costanzo | Chief Financial Officer | J | +2 | +$3.50K |
| 2026-07-16 | Andrew G. Crowley | EVP & Pres., Markel Ventures | J | +10 | +$17.50K |
| 2026-06-17 | Jonathan E Michael | Director | J | +65 | +$110.00K |
| 2026-06-17 | Michael Oreilly | Director | J | +89 | +$150.00K |
| 2026-06-17 | Morgan E. Housel | Director | J | +65 | +$110.00K |
| 2026-06-17 | Harold Lawrence Morrison Jr. | Director | J | +32 | +$55.00K |
| 2026-06-17 | Mark Besca | Director | J | +80 | +$135.00K |
| 2026-06-17 | A. Lynne Puckett | Director | J | +65 | +$110.00K |
| 2026-06-17 | Diane Leopold | Director | J | +65 | +$110.00K |
| 2026-06-17 | Lawrence A Cunningham | Director | J | +32 | +$55.00K |
| 2026-05-27 | Greta J Harris | Director | Sell | −76 | −$140.40K |
| 2026-05-22 | Diane Leopold | Director | A | +89 | — |
| 2026-05-22 | A. Lynne Puckett | Director | A | +89 | — |
| 2026-05-22 | Morgan E. Housel | Director | A | +89 | — |
| 2026-05-22 | Michael Oreilly | Director | A | +89 | — |
| 2026-05-22 | Lawrence A Cunningham | Director | A | +89 | — |
| 2026-05-22 | Greta J Harris | Director | A | +89 | — |
| 2026-05-22 | Mark Besca | Director | A | +89 | — |
| 2026-05-22 | Harold Lawrence Morrison Jr. | Director | A | +89 | — |
| 2026-05-22 | Jonathan E Michael | Director | A | +89 | — |
| 2026-05-19 | Brian J. Costanzo | Chief Financial Officer | MIXED | +17 | +$25.88K |
| 2026-05-19 | Andrew G. Crowley | EVP & Pres., Markel Ventures | MIXED | −14 | −$38.05K |
| 2026-05-19 | Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | F | −116 | −$214.56K |
| 2026-05-19 | Thomas Sinnickson Gayner | Chief Executive Officer | F | −481 | −$888.20K |
| 2026-05-08 | Diane Leopold | Director | Buy | +150 | +$268.72K |
| 2026-05-05 | A. Lynne Puckett | Director | Buy | +57 | +$102.35K |
| 2026-04-15 | Brian J. Costanzo | Chief Financial Officer | J | +1 | +$3.00K |
| 2026-04-15 | Andrew G. Crowley | EVP & Pres., Markel Ventures | J | +9 | +$15.00K |
| 2026-02-26 | Simon Wilson | EVP and CEO, Markel Insurance | MIXED | +768 | −$207.95K |
| 2026-02-26 | Thomas Sinnickson Gayner | Chief Executive Officer | A | +4,483 | — |
| 2026-02-26 | Meade P. Grandis | CAO and Controller | A | +69 | — |
| 2026-02-26 | Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | A | +800 | — |
| 2026-02-26 | Andrew G. Crowley | EVP & Pres., Markel Ventures | A | +830 | — |
| 2026-02-26 | Brian J. Costanzo | Chief Financial Officer | A | +654 | — |
| 2026-02-19 | Simon Wilson | CEO, Markel Insurance | F | −47 | −$97.97K |
| 2026-01-20 | Brian J. Costanzo | Chief Financial Officer | J | +2 | +$3.50K |
| 2025-12-15 | Steven A Markel | Director | Sell | −1,330 | −$2.82M |
| 2025-12-03 | Brian J. Costanzo | Chief Financial Officer | F | −21 | −$44.77K |
| 2025-12-03 | Andrew G. Crowley | President, Markel Ventures | F | −64 | −$133.48K |
| 2025-12-03 | Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | F | −138 | −$284.41K |
| 2025-12-03 | Michael R Heaton | EVP & Chief Operating Officer | F | −217 | −$447.99K |
| 2025-12-03 | Simon Wilson | CEO, Markel Insurance | F | −94 | −$193.72K |
| 2025-12-03 | Thomas Sinnickson Gayner | Chief Executive Officer | F | −36 | −$75.45K |
| 2025-12-01 | Steven A Markel | Director | Sell | −170 | −$357.00K |
| 2025-11-25 | Simon Wilson | CEO, Markel Insurance | Sell | −75 | −$155.47K |
| 2025-11-18 | Steven A Markel | Director | G | −500 | — |
| 2025-10-16 | Brian J. Costanzo | Chief Financial Officer | J | +1 | +$3.00K |
| 2025-08-27 | Meade P. Grandis | CAO and Controller | Sell | −75 | −$148.78K |
| 2025-07-16 | Brian J. Costanzo | Chief Financial Officer | J | +2 | +$3.50K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Steven A Markel | Director | 62,558 | $116.27M |
| Thomas Sinnickson Gayner | Chief Executive Officer | 56,682 | $105.35M |
| Anthony F Markel | Director | 17,443 | $32.42M |
| Jeremy Andrew Noble | President, Insurance | 5,129 | $9.53M |
| Michael R Heaton | EVP & Chief Operating Officer | 4,869 | $9.05M |
| Richard Randolph Grinnan | SVP, Chief Legal Officer & Sec | 4,267 | $7.93M |
| Michael Oreilly | Director | 3,934 | $7.31M |
| Andrew G. Crowley | EVP & Pres., Markel Ventures | 2,955 | $5.49M |
| Diane Leopold | Director | 2,895 | $5.38M |
| Simon Wilson | EVP and CEO, Markel Insurance | 2,496 | $4.64M |
| A. Lynne Puckett | Director | 1,970 | $3.66M |
| Brian J. Costanzo | Chief Financial Officer | 1,866 | $3.47M |
| Mark Besca | Director | 1,222 | $2.27M |
| Harold Lawrence Morrison Jr. | Director | 1,126 | $2.09M |
| Lawrence A Cunningham | Director | 1,041 | $1.94M |
| Morgan E. Housel | Director | 1,028 | $1.91M |
| Greta J Harris | Director | 672 | $1.25M |
| Meade P. Grandis | CAO and Controller | 362 | $673.29K |
| Jonathan E Michael | Director | 332 | $618.41K |
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.
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.