Item 8.01. Other Events.

On November 18, 2009, Zenith National Insurance Corp., the Registrant, issued a press release announcing an increase in its California workers' compensation rates effective January 1, 2010. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99.1 and it is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

The following exhibit is filed as part of this report:

Number Exhibit
99.1 Press Release of Zenith National Insurance Corp. dated November 18, 2009

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