Item 8.01. Other Events.

On May 19, 2009, Zenith National Insurance Corp., the Registrant, issued a press release announcing an increase in its California workers' compensation rates effective July 1, 2009. 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 May 19, 2009