Ticker | Value | Shares | Price | Security | Type | Insider | Title | Return | Flags | Date |
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Brian J. Costanzo currently holds 1,632.24 shares of MARKEL CORP (MKL), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Brian J. Costanzo has been a net neutral trader of MKL stock. They have purchased $0 and sold $0 worth of shares.
Brian J. Costanzo's most recent insider trade was on Jun 30, 2026, when they sold 2.16 shares at $1617.19 per share.
Brian J. Costanzo serves as Executive at MARKEL CORP (MKL). They have executed 18 insider transactions totaling $0 over their tenure at the company.
Brian J. Costanzo holds the position of Executive at MARKEL CORP, where they are responsible for executive-level decision-making and strategic oversight. They have been associated with the company for 4 years and currently hold a stake valued at $0.
Brian J. Costanzo has shown a balanced trading pattern, with $0 in total purchases and $0 in total sales across all transactions. Their most recent activity indicates a balanced approach to trading.
The largest transaction by Brian J. Costanzo was on Dec 2, 2025, when they sold $44.8K worth of MKL shares. This transaction involved 21.72 shares at $2060.83 per share.
Brian J. Costanzo currently owns 1,632.24 shares of MARKEL CORP (MKL), with an estimated value of $0. This stake represents their equity holdings accumulated through purchases, awards, and option exercises.
All of Brian J. Costanzo's SEC Form 4 insider trading filings are tracked on this page. Each transaction links directly to the official SEC EDGAR filing. Brian J. Costanzo has 18 Form 4 filings on record as an insider at MARKEL CORP.
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