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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
1227102	Constantine Iordanou	Wessex House, 4Th Floor 45 Reid Street Hamilton D0 HM 12	Chairman, President & Ceo	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
Common Shares, $.01 Par Value Per Share	Disposition	2010-06-16	3,500	$75.80	199,260	No	4	S	Direct
Common Shares, $.01 Par Value Per Share	Disposition	2010-06-16	6,500	$76.08	192,760	No	4	S	Direct
Common Shares, $01 Par Value Per Share	Disposition	2010-06-17	5,000	$77.01	187,760	No	4	S	Direct
Common Shares, $.01 Par Value Per Share	Disposition	2010-06-18	5,000	$78.03	182,760	No	4	S	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Series B Non-Cumulative Preferred Shares (Non-Convertible)	67,273	Indirect	By GRAT
Series A Non-Cumulative Preferred Shares (Non-Convertible)	11,224	Indirect	BY GRAT
Common Shares, $.01 Par Value Per Share	129,415	Indirect	By Limited Liability Company
Series B Non-Cumulative Preferred Shares (Non-Convertible)	1,400	Indirect	By spouse
Common Shares, $.01 Par Value Per Share	7,744	Indirect	By children

Footnotes

The sale of shares was effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on June 15, 2010.
Represents a weighted average sales price; the sales prices range from $75.66 to $75.99. 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.
Represents a weighted average sales price; the sales prices range from $76 to $76.20. 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 shares are owned by Mathiatis LLC, a limited liability company. The reporting person owns all of the membership interests in Mathiatis LLC and serves as its sole managing member.
Represents a weighted average sales price; the sales prices range from $77 to $77.05. 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.
Represents a weighted average sales price; the sales prices range from $78 to $78.08. 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.