ARCH CAPITAL GROUP LTD. — Director's Dealing 2010

Nov 9, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ARCH CAPITAL GROUP LTD. (ACGL)
CIK: 0000947484
Period of Report: 2010-11-05

Reporting Person: PETRILLO LOUIS T (Officer of Subsidiary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-11-05	Common Shares, $.01 par value per share	S	5000	$89.51	Disposed	22068	Direct

Footnotes

F1: Represents a weighted average sale price; the sale prices ranged from $89.50 to $89.55. 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.