Zenith Insurance Company
|Headquarters||Woodland Hills, California|
|Key people||Jack D. Miller (President and Chief Executive Officer)|
Zenith Insurance Company is a US insurance company headquartered in California specializing in Workers' compensation insurance. It has been an indirect wholly owned subsidiary of Canadian Fairfax Financial Holdings Limited since 2011.
The company is primarily engaged nationally in the workers' compensation insurance business and conducts business in 46 states and the District of Columbia through independent agencies and brokers.
Zenith focuses on workplace safety and health, helping injured workers receive appropriate medical care, managing claim costs, returning employees to work, and fighting fraud and abuse. Its Agribusiness Solutions division offers property, auto, liability & umbrella insurance for California agricultural businesses.
In June 2014, A.M. Best Company affirmed Zenith's and its subsidiary, ZNAT Insurance Company's, rating of "A" (Excellent).  The rating is based on the company's excellent capitalization, strong operating performance and disciplined approach to pricing and underwriting risks. 
The company was established in 1949, and since 1971 it has slowly expanded across the nation until it conducted business in 46 of the 50 U.S states and the District of Columbia. Most of its business has come to be conducted through independent agencies. In 1971, Zenith National Insurance Corp. went public and was listed on the NASDQ. In 1987, the company was listed on the NYSE under the ticker symbol ZNT until 2010 when Fairfax Financial purchased the company for $1.3 Billion.
Board of directors
Zenith National Insurance Corp
- Andrew A. Barnard
- Peter S. Clarke
- David J. Bonham
- Michael E. Jansen
- Jack D. Miller
- Paul C. Rivett
- Kari L. Van Gundy 
Zenith Insurance Company LLC
- Jack D. Miller - President and Chief Executive Officer
- Michael E. Jansen – Executive Vice President & General Counsel
- Kari Van Gundy – Executive Vice President & Chief Financial Officer 
- Fairfax to buy all of Zenith
- "Zenith National Investors Lose Bid to Halt Fairfax Financial Acquisition". Bloomberg. April 23, 2010.
- "Zenith Merger Will Make Fairfax 7th Largest Workers’ Comp Writer in Calif". Insurance Journal. February 19, 2010.