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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
1331038	Preston W Hutchings	Wessex House, 5Th Floor 45 Reid Street Hamilton D0 HM 12	Svp & Chief Investment Officer	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	2012-02-22	50,000	$15.11	121,769	No	4	M	Indirect	By Company
Common Shares, $.0033 Par Value Per Share	Disposition	2012-02-22	20,512	$36.84	101,257	No	4	F	Indirect	By Company
Common Shares, $.0033 Par Value Per Share	Disposition	2012-02-23	29,488	$36.72	71,769	No	4	S	Indirect	By Company

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Indirect	By Company
No	4	F	Indirect	By Company
No	4	S	Indirect	By Company

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	2012-02-22	50,000	$0.00	50,000	$15.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
100,000		2015-07-01	No	4	M	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares, $.0033 Par Value Per Share	38,148	Direct

Footnotes

The stock option became exercisable in three equal annual installments with the first installment being exerciable on July 1, 2005 and the second and third installments being exercisable on July 1, 2006 and July 1, 2007, subject to the applicable award agreemnt.
The shares are held by a company which is owned by a family trust; beneficiaries of the family trust are the Reporting Person, his spouse and their minor children.
Represents a weighted average sale price; the sales prices range from $37.70 to $37.75. 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 February 22, 2012, the Reporting Person exercised 50,000 stock options and, under the net settlement provisions of the applicable stock option agreement, 20,512 common shares were withheld in payment of the exercise price.