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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
1227099	M John Pasquesi	C/O Otter Capital Llc 755 Page Mill Road Palo Alto CA 94304		Yes	No	No	Yes

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Shares, $.0033 Par Value Per Share	Acquisiton	2011-07-26	800,000	$6.67	890,119	No	4	M	Direct
Common Shares, $.0033 Par Value Per Share	Disposition	2001-07-26	154,419	$34.54	735,700	No	4	F	Direct
Common Shares, $.0033 Par Value Per Share	Disposition	2011-07-27	99,393	$34.26	636,307	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	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	2011-07-26	800,000	$0.00	800,000	$6.67

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
552,838	2001-10-23	2011-10-23	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares, $.0033 Par Value Per Share	1,152,804	Indirect	By Limited Liability Company
Common Shares, $.0033 Par Value Per Share	62,211	Indirect	By Trust

Footnotes

The security holder is Otter Capital LLC, for which Mr. Pasquesi serves as managing member. All indicated securities are included because of his affiliation with Otter Capital LLC.
The reporting person contributed his directly owned shares of the company to a revocable trust. The reporting person and his spouse are the trustees.
On July 26, 2011, the reporting person exercised 800,000 stock options and, under the net settlement provisions of the applicable stock option agreement, 154,419 common shares were withheld in payment of the exercise price.
Represents a weighted average sales price; the sales prices range from $34.25 to $34.435. 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.