Zenith National Insurance Corp. is an indirect wholly owned subsidiary of Fairfax Financial Holdings Limited. Zenith National Insurance Corp. is the holding company for Zenith Insurance Company and its subsidiaries, including ZNAT Insurance Company ("Zenith"). Since 1977, Zenith Insurance Company has been a specialist in workers' compensation. Zenith conducts business in 45 states and the District of Columbia through independent insurance agencies. In May 2010, A.M.