X0202 4 2007-05-10 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 2007-05-10 4 S 0 100 71.52 D 233465 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 694 71.53 D 232771 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 206 71.54 D 232565 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 200 71.55 D 232365 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 200 71.56 D 232165 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.57 D 232065 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 300 71.59 D 231765 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 200 71.6 D 231565 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.61 D 231465 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 300 71.62 D 231165 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.63 D 231065 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.64 D 230965 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 400 71.65 D 230565 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.66 D 230465 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.69 D 230365 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.7 D 230265 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.71 D 230165 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.73 D 230065 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 100 71.75 D 229965 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 200 71.76 D 229765 D Common Shares, $.01 par value per share 2007-05-10 4 S 0 200 71.77 D 229565 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 2007-05-14