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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
1227098	F Robert Works	C/O Arch Capital Group Ltd. 45 Reid Street, 5Th Floor Hamilton D0 HM 12		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Shares, $.0033 Par Value Per Share	Disposition	2012-09-14	8,000	$41.15	74,108	No	4	S	Direct
Common Shares, $.0033 Par Value Per Share	Acquisiton	2012-09-14	4,500	$10.22	78,608	No	4	M	Direct
Common Shares, $.0033 Par Value Per Share	Disposition	2012-09-14	1,118	$41.15	77,490	No	4	F	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	M	Direct
No	4	F	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	2012-09-14	4,500	$0.00	4,500	$10.22

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2004-01-01	2013-01-01	No	4	M	Direct

Footnotes

Represents a weighted sales price; the sales prices range from $41.12 to $41.2027. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission or to a security holder of the issuer.
On September 14, 2012, the reporting person exercised 4,500 stock options and, under the net settlement provisions of the applicable stock option agreement, 1,118 common shares were withheld in payment of the exericise price.