X0202 4 2006-08-08 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001114751 INGREY PAUL B WESSEX HOUSE, 4TH FLOOR 45 REID STREET HAMILTON D0 HM 12 BERMUDA 1 0 0 1 Chairman of the Board Common Shares, $01 par value per share 2006-08-08 4 S 0 1787 58.7638 D 296354 D Common Shares, $01 par value per share 2006-08-08 4 S 0 5000 58.7808 D 291354 D Common Shares, $01 par value per share 2006-08-08 4 S 0 5000 58.841 D 286354 D Common Shares, $01 par value per share 2006-08-09 4 S 0 5000 58.5786 D 281354 D Common Shares, $01 par value per share 2006-08-09 4 S 0 6789 58.7026 D 274565 D The sale of shares was effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on December 12, 2005. Louis T. Petrillo Attorney in fact 2006-08-09