X0303 4 2009-08-13 0 0001163348 ALLIED WORLD ASSURANCE CO HOLDINGS LTD AWH 0001063754 DILLARD JOAN H ALLIED WORLD ASSURANCE CO HOLDINGS, LTD 27 RICHMOND ROAD PEMBROKE, BERMUDA D0 HM 08 BERMUDA 0 1 0 0 SVP & CFO Common Shares 2009-08-13 4 S 0 5000 45.00 D 56586 D The sale of Common Shares reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2008. Includes 613 Common Shares of the Company acquired on June 30, 2009 pursuant to the Company's 2008 Employee Share Purchase Plan. /s/ Wayne H. Datz, by Power of Attorney 2009-08-14