X0303 4 2009-02-26 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 2009-02-26 4 A 0 20000 0.00 A 60973 D Restricted Stock Units 2009-02-26 4 A 0 5000 0.00 A Common Shares 2500 5000 D Represents the Company's Common Shares that were earned pursuant to a 2006 LTIP award for no monetary consideration and which vested at 150% of target based on the achievement of pre-established performance criteria during the applicable three-year performance period established under the Company's Amended and Restated Long-Term Incentive Plan. Includes 640 Common Shares of the Company acquired on December 31, 2008 pursuant to the Company's 2008 Employee Share Purchase Plan. Grant of Restricted Stock Units for no monetary consideration. 5,000 Restricted Stock Units convert into (i) 2,500 Common Shares of the Company and (ii) cash equal to the market value of 2,500 Common Shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. The Restricted Stock Units vest in four equal annual installments with the first installment vesting on February 26, 2010. /s/ Wesley D. Dupont, by Power of Attorney 2009-03-02