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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
1220640	Kewsong Lee	C/O Warburg Pincus Llc 450 Lexington Ave New York NY 10017		Yes	No	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, $0.01 Par Value Per Share	Disposition	2010-03-02	588,747	$74.15	0	No	4	S	Indirect	See Footnotes (1) and (2)

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnotes (1) and (2)

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares, $0.01 Par Value Per Share	150,199	Direct

Footnotes

See Exhibit 99.1.
Kewsong Lee, a Director of the Issuer, is a General Partner of WP, a Managing Director and Member of WP LLC and a beneficial owner of certain shares of capital stock of WP VIII Bermuda Ltd. and WPIP Bermuda Ltd. Mr. Lee owns 150,199 Common Shares, 13,271 of which were granted to Mr. Lee in consideration of his service as a Director of the Issuer. Mr. Lee may be deemed to have had an indirect pecuniary interest (within the meaning of Rule 16a-1 under the Securities Exchange Act of 1934) in an indeterminate portion of the shares that were owned by WP VIII Bermuda, WPIP Bermuda and WPIP Netherlands I. Mr. Lee disclaims beneficial ownership of all shares owned by the Warburg Pincus Entities, except to the extent of any pecuniary interest therein.
On March 2, 2010, WPIP Bermuda sold 263,052 Common Shares, WPIP Netherlands I sold 10,958 Common Shares, and WP VIII Bermuda sold 314,737 Common Shares in a private transaction.