Market cap: $17,987,235,484
Markel Corp. is a financial holding company, which engages in underwriting specialty insurance products for a variety of niche markets. It operates through the following segments: Insurance and Reinsurance. The Insurance segment includes all direct business and facultative placements written within the company's underwriting operations. The Reinsurance segment includes all treaty reinsurance written within the company's underwriting operations. Markel was founded by Samuel A. Markel in 1930 and is headquartered in Glen Allen, VA.