Workers' compensation claims typically mark a low point for employers, but Zenith National Insurance aims to get companies back up to their peak. 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 has exited all other businesses, but maintains a portfolio of investments. Approximately 1,600 independent agents sell the firm's insurance products. Its largest market is California, but the company also maintains offices in Alabama, Florida, Illinois, North Carolina, Pennsylvania, and Texas. Zenith National was acquired by Canada's Fairfax Financial in 2010.