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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
947484	Arch Capital Group Ltd.	ACGL	Fire, Marine & Casualty Insurance (6331)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1286007	Marc Grandisson	Wessex House, 5Th Floor, 45 Reid Street Hamilton D0 HM 12	Reinsur. Group Chairman & Ceo	No	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, $.0033 Par Value Per Share	Acquisiton	2011-09-14	52,500	$6.67	470,724	No	4	M	Direct
Common Shares, $.0033 Par Value Per Share	Disposition	2011-09-14	52,500	$33.29	418,224	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, $.0033 Par Value Per Share	Stock Option (right to buy)	Disposition	2011-09-14	52,500	$6.67	52,500	$6.67

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2011-10-23	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares, $.0033 Par Value Per Share	660	Indirect	By spouse

Footnotes

The stock option became exercisable in three equal annual installments with the first installment becoming exercisable on November 20, 2001 and the second installment on October 23, 2002 and the third installment on October 23, 2003.
Represents a weighted average sales price; the sales prices range from $33.25 to $33.45. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission or a security holder of the issuer.
The amount of common shares includes common shares acquired in connection with a 3-for-one share split effectuated by Arch Capital Group Ltd. on May 11, 2011.