ARCH CAPITAL GROUP LTD. — Director's Dealing 2010

May 7, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ARCH CAPITAL GROUP LTD. (ACGL)
CIK: 0000947484
Period of Report: 2009-05-05

Reporting Person: BUNCE JOHN L JR (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-05	Common Shares, $.01 par value per share	A	999	—	Acquired	221394	Direct
2010-05-05	Common Shares, $.01 par value per share	A	799	—	Acquired	222193	Direct

Footnotes

F1: Represents shares granted as part of the director-elected annual retainer for serving as a director of the Issuer.

F2: Subject to the terms of the restricted share agreement, represents restricted shares that will vest on May 4, 2011.