X0201 4 2003-11-18 0 0000109261 ZENITH NATIONAL INSURANCE CORP ZNT 0001238643 TICKNER JOHN J 21255 CALIFA ST. WOODLAND HILLS CA 91367 0 1 0 0 Sr. Vice President & Secretary Common Stock 2664 I See Footnote Common Stock 2003-11-18 4 M 0 3800 19.1563 A 3800 D Common Stock 2003-11-18 4 S 0 400 31.70 D 3400 D Common Stock 2003-11-18 4 S 0 200 32.04 D 3200 D Common Stock 2003-11-18 4 S 0 100 32.11 D 3100 D Common Stock 2003-11-18 4 S 0 100 32.16 D 3000 D Common Stock 2003-11-18 4 S 0 100 32.24 D 2900 D Common Stock 2003-11-18 4 S 0 100 32.28 D 2800 D Common Stock 2003-11-18 4 S 0 400 32.32 D 2400 D Common Stock 2003-11-18 4 S 0 800 32.33 D 1600 D Common Stock 2003-11-18 4 S 0 400 32.34 D 1200 D Common Stock 2003-11-18 4 S 0 100 32.35 D 1100 D Common Stock 2003-11-18 4 S 0 100 32.38 D 1000 D Common Stock 2003-11-18 4 S 0 100 32.44 D 900 D Common Stock 2003-11-18 4 S 0 400 32.50 D 500 D Common Stock 2003-11-18 4 S 0 400 32.51 D 100 D Common Stock 2003-11-18 4 S 0 100 32.52 D 0 D Common Stock 2003-11-19 4 M 0 6200 19.1563 A 6200 D Common Stock 2003-11-19 4 S 0 2000 31.70 D 4200 D Common Stock 2003-11-19 4 S 0 600 31.72 D 3600 D Common Stock 2003-11-19 4 S 0 2400 31.73 D 1200 D Common Stock 2003-11-19 4 S 0 1100 31.74 D 100 D Common Stock 2003-11-19 4 S 0 100 31.71 D 0 D Employee Stock Option (Right to Buy) 19.1563 2003-11-18 4 M 0 3800 0.00 D 2005-02-23 Common Stock 3800 21200 D Employee Stock Option (Right to Buy) 19.1563 2003-11-19 4 M 0 6200 0 D 2005-02-23 Common Stock 6200 15000 D Represents the approximate number of shares allocated to the reporting person's account in The Zenith 401(k) Plan as of November 18, 2003, the latest date for which such information is available. The option vests in four equal installments on February 24, 2001, 2002, 2003 and 2004. /s/ John J. Tickner 2003-11-20