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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	2012-12-04	149,032	$44.61	386,062	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	250,000	Indirect	By Limited Liability Company
Common Shares, $.0033 Par Value Per Share	379,314	Indirect	By 2005 GRAT
Common Shares, $.0033 Par Value Per Share	116,613	Indirect	By Limited Liability Company
Common Shares, $.0033 Par Value Per Share	11,616	Indirect	By child

Footnotes

Represents a weighted average sales price; the sales prices range from $44.46 to $44.75. 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 hoder of the issuer.
The shares were sold in order to satisfy state and federal income tax obligations.
The security holder is Protaras LLC, a limited liability company. The reporting person owns all of the membership interests in Protaras LLC and serves as its sole managing member.