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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1163348	Allied World Assurance Co Holdings Ltd	AWH	Fire, Marine & Casualty Insurance (6331)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1368443	A Scott Carmilani	Allied World Assurance Co Holdings, Ltd 27 Richmond Road Pembroke D0 HM 08	President, Ceo And Chrmn Of Bd	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Shares	Acquisiton	2010-09-10	20,000	$24.27	229,901	No	4	M	Direct
Common Shares	Disposition	2010-09-10	20,000	$53.08	209,901	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Shares	Employee Stock Options (right to buy)	Disposition	2010-09-10	20,000	$0.00	20,000	$24.27

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
31,667	2002-11-21	2011-11-21	No	4	M	Direct

Footnotes

The exercise of Employee Stock Options and sale of Common Shares reported in this Form 4 were for tax purposes and were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 11, 2010.
Represents a weighted average sale price: the sales prices range from $52.88 to $53.19. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer.
These securities vested in four equal annual installments with the first installment vesting on the date shown.