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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, 5Th 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	Explanation
Common Shares, $.0033 Par Value Per Share	Disposition	2011-08-29	70,000	$33.91	422,045	No	4	S	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares, $.0033 Par Value Per Share	343,245	Indirect	By Limited Liability Company
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
Series B Non-Cumulative Preferred Shares (Non-Convertible)	1,400	Indirect	By spouse
Common Shares, $.0033 Par Value Per Share	23,232	Indirect	By children

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Common Shares, $.0033 Par Value Per Share	Stock Option (right to buy)	$18.76		2016-02-23	132,447	132,447	Direct
Common Shares, $.0033 Par Value Per Share	Stock Option (right to buy)	$18.76		2016-02-23	317,553	317,553	Indirect

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2016-02-23	132,447	132,447	Direct
2016-02-23	317,553	317,553	Indirect

Footnotes

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.
The stock option became exercisable in three equal annual installments with the first installment being exercisable on February 23, 2007 and the second and third installments being exercisable on February 23, 2008 and February 23, 2009.
On June 9, 2011, 132,447 stock options were distributed from a GRAT. Such options were previously reported as indirectly beneficially held by a GRAT. Following such distribution, the reporting person owns 132,447 stock options directly and 317,553 stock options indirectly by the GRAT.
The amount of common shares includes common shares acquired in connection with a 3-for-1 share split effectuated on May 11, 2011.
Represents a weighted average sales price; the sales prices range from $33.85 to $33.9501. 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.
The shares were sold in order to satisfy state and federal income tax obligations.