F
$ Value
$45K
Shares
22
Price
$2K
Filed
Dec 3
Insider
Name
Costanzo Brian J.
Title
Chief Financial Officer
CIK
0001873434
Roles
Officer
Transaction Details
Transaction Date
2025-12-02
Code
F
Table
Non-Derivative
Ownership
Direct
Equity Swap
No
Shares After
954
Footnotes
The information reported herein is based on the MKL 401(k) plan balance as of September 30, 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 |