Brian J. Costanzo
CIK 1873434 · Chief Financial Officer · last filed 2026-05-19
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$3.37M
Companies
1
Total Filings
24
Lifetime Open-Market Net
$0
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| MKL | Chief Financial Officer | 1,826 | $1846.00 | $3.37M | $0 | 24 | 2026-05-19 |
Recent Filings · Page 2 of 3
24 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-12-09 | MKL | Tax (F) | −21 | -$36.9K | EDGAR |
| 2024-10-16 | MKL | Other (J) | +1 | $2.4K | EDGAR |
| 2024-07-17 | MKL | Other (J) | +2 | $2.8K | EDGAR |
| 2024-04-18 | MKL | Other (J) | +1 | $2.4K | EDGAR |
| 2024-02-27 | MKL | Grant (A) | +108 | $0 | EDGAR |
| 2024-02-22 | MKL | Grant (A) | +94 | $0 | EDGAR |
| 2024-01-17 | MKL | Other (J) | +2 | $2.8K | EDGAR |
| 2023-12-06 | MKL | Tax (F) | −15 | -$21.0K | EDGAR |
| 2023-10-17 | MKL | Other (J) | +2 | $2.4K | EDGAR |
| 2023-07-14 | MKL | Other (J) | +1 | $1.5K | EDGAR |
Codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.