Costanzo Brian J.

Insider

Chief Financial Officer

Trades at: MKL

30D 90D 1Y

No open-market buys or sells in this period. The transactions below are grants, option exercises and gifts, which carry no market price.

Trading track record · all companies

Running net of open-market buys − sells across every company. Tap the line or a marker for details. ▲ buy · ▼ sell.

Transactions · 90d

Open-market Buys Sells All types

MKL Other·J
May 15, 26

Chief Financial Officer

$50.0K

30 sh · $1,659.47
MKL Other·F
May 15, 26

Chief Financial Officer

$24.1K

13 sh · $1,844.00

Own -1%
MKL Other·J
Mar 31, 26

Chief Financial Officer

$3.0K

2 sh · $1,630.41

Date▾	Ticker	Role	Type	Shares	Own Δ	Price	Value
May 15, 2026	MKL	Chief Financial Officer	Other J	30	—	$1,659.47	$50.0K
May 15, 2026	MKL	Chief Financial Officer	Other F	13	-1%	$1,844.00	$24.1K
Mar 31, 2026	MKL	Chief Financial Officer	Other J	2	—	$1,630.41	$3.0K

Buy Sell Non-market (grant · exercise · gift)

About Costanzo Brian J.

This profile aggregates every SEC Form 4 insider transaction reported by Costanzo Brian J. across all companies they trade. Open-market purchases (code P) and sales (code S) are the highest-signal, discretionary trades; grants (A), option exercises (M) and gifts (G) reflect compensation rather than conviction and carry no market price. Figures cover the selected period and update as new filings are ingested.