Markel Corporation is a financial holding company serving a range of markets. The Company's principal business markets and underwrites specialty insurance products. The Company operates through two underwriting 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 its underwriting operations. The Company, through its subsidiary Markel Ventures, Inc. (Markel Ventures), which owns interests in various industrial and service businesses that operate outside of the specialty insurance marketplace. The Company’s subsidiaries include Alterra Capital Holdings Limited, Essentia Insurance Company, Markel American Insurance Company, Markel Aspen, Inc., Markel Holdings GmbH, Markel India Investments, Inc. and Markel Insurance Company.