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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
1359049	Donald Mark Lyons	300 Plaza Three, 3Rd Floor Jersey City NJ 07311	Chairman & Ceo Arch Insur Gr	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	2012-02-16	25,750	$8.77	144,059	No	4	M	Direct
Common Shares, $.0033 Par Value Per Share	Disposition	2012-02-16	25,750	$37.74	118,309	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	2012-02-16	25,750	$0.00	25,750	$8.77

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
28,598		2012-08-06	No	4	M	Direct

Footnotes

90,750 of such amount will settle in Issuer's common shares upon the termination of the Reporting Person's employment, as specifically provided in the award agreements.
The stock option became exercisable in three equal annual installments commencing on August 6, 2002, subject to the applicable award agreement.
Represents a weighted average sale price; the sales prices range from $37.50 to $37.995. 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.