Zenith National is the holding company for Zenith Insurance and ZNAT Insurance, which underwrite workers' compensation policies in 45 states and Washington, DC. The company also offers agribusiness coverage in California and maintains a portfolio of investments. Approximately 1,600 independent agents sell the firm's insurance products. California is its largest market, but the company also maintains offices in Alabama, Florida, Illinois, North Carolina, Pennsylvania, and Texas. Zenith National is a subsidiary of Canada's Fairfax Financial.