Brian J. Costanzo
Chief Financial Officer · MARKEL GROUP INC.
Individual
- 2024
- Jul 16, 2026
- 11
Filings (90d)
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies Brian J. Costanzo files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Simon Wilson - $363K in MKL purchases and sales in the last 12 months
- Steven A. Markel - $357K in MKL purchases and sales in the last 12 months
- Diane Leopold - $269K in MKL purchases and sales in the last 12 months
- Greta J. Harris - $140K in MKL purchases and sales in the last 12 months
- A. Lynne Puckett - $102K in MKL purchases and sales in the last 12 months
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Frequently asked questions
Who is Brian J. Costanzo?
Brian J. Costanzo is a corporate insider, tracked as Chief Financial Officer of MARKEL GROUP INC. (MKL). InsiderAlpha holds 11 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Brian J. Costanzo last file a Form 4?
The most recent primary Form 4 on record is dated 16 July 2026, one of 11 filings going back to 2024.
