Zenith National Insurance Corp. (Zenith National) is a holding company engaged, through its wholly owned subsidiaries, Zenith Insurance Company (Zenith Insurance) and ZNAT Insurance Company (ZNAT Insurance) in the workers' compensation insurance business. The Company is in the business of managing insurance and investment risk. The Company invests the net cash flow from the operations and the capital in the fixed maturity securities. The Company operates in three business segments: worker’s compensation, reinsurance and investments.