Costanzo Brian J. (CIK 1873434) reported 11 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-19). Recent activity: Sell MKL (13 shares), Buy MKL (30 shares), Buy MKL (2 shares), Buy MKL (655 shares), Buy MKL (2 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-19 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Sell | 13 | $24,120 |
| 2026-05-19 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 30 | $50,000 |
| 2026-04-15 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 2 | $3,000 |
| 2026-02-26 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 655 | $0 |
| 2026-01-20 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 2 | $3,494 |
| 2025-12-03 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Sell | 22 | $44,761 |
| 2025-10-16 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 2 | $3,006 |
| 2025-07-16 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 2 | $3,494 |
| 2025-04-17 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 2 | $3,007 |
| 2025-02-20 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 379 | $0 |
| 2025-01-17 | MARKEL GROUP INC. (MKL) | Chief Financial Officer | Buy | 2 | $2,794 |
Source: SEC Form 4 filings · as of 2026-05-19