J
$ Value
$4K
Shares
2
Price
$2K
Filed
Jan 20
Insider
Name
Costanzo Brian J.
Title
Chief Financial Officer
CIK
0001873434
Roles
Officer
Transaction Details
Transaction Date
2025-12-31
Code
J
Table
Non-Derivative
Ownership
Direct
Equity Swap
No
Shares After
957
Footnotes
Shares acquired under the qualified component of the MKL 2020 Employee Stock Purchase Plan in a transaction exempt under Exchange Act Rule 16b-3(c). | The information reported herein is based on MKL 401(k) plan balance as of December 31, 2025.
Filing Info
Costanzo Brian J.'s History
| Date | Ticker | Type | Value |
|---|---|---|---|
| 2026-03-31 | MKL | J | $3K |
| 2026-02-24 | MKL | A | $0 |
| 2025-12-31 | MKL | J | $4K |
| 2025-12-02 | MKL | F | $45K |
| 2025-09-30 | MKL | J | $3K |
| 2025-06-30 | MKL | J | $4K |
Other Insiders at MKL (90d)
| Insider | Bought | Sold | Last |
|---|---|---|---|
|
GAYNER THOMAS SINNICKSON
Chief Executive Officer
|
— | — | 2026-02-24 |
|
Grinnan Richard Randolph
SVP, Chief Legal Officer & Sec
|
— | — | 2026-02-24 |
|
Costanzo Brian J.
Chief Financial Officer
|
— | — | 2026-03-31 |
|
Crowley Andrew G.
EVP & Pres., Markel Ventures
|
— | — | 2026-03-31 |
|
Grandis Meade P.
CAO and Controller
|
— | — | 2026-02-24 |
|
Wilson Simon
CEO, Markel Insurance
|
— | — | 2026-02-17 |
|
Wilson Simon
EVP and CEO, Markel Insurance
|
— | $208K | 2026-02-26 |