X0202 4 2007-08-07 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 0 Chairman - Board of Directors Common Shares, $.01 par value per share 2007-08-07 4 S 0 900 68.91 D 218561 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 28 68.94 D 218533 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 200 68.95 D 218333 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 100 68.96 D 218233 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 990 68.97 D 217243 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 100 68.98 D 217143 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 714 68.99 D 216429 D Common Shares, $.01 par value per share 2007-08-07 4 S 0 1864 69 D 214565 D The sale of shares was effected pursuant to a Rule 10b5-1 Plan adopted by the Reporting Person on February 14, 2007. /s/ Louis T. Petrillo Attorney in Fact 2007-08-08