X0202 4 2007-08-09 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 2007-08-09 4 S 0 100 65.56 D 191165 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.74 D 191065 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.86 D 190965 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 65.87 D 190765 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.91 D 190665 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 65.93 D 190265 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 396 65.94 D 189869 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 599 65.95 D 189270 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 300 65.96 D 188970 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 5 65.97 D 188965 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 300 65.99 D 188665 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 893 66 D 187772 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 66.01 D 187572 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 207 66.02 D 187365 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 45 66.04 D 187320 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 66.0425 D 187120 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 55 66.06 D 187065 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 66.075 D 186965 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 66.0925 D 186565 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 66.1025 D 186365 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 66.11 D 186165 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 81 66.22 D 186084 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 66.24 D 185884 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 19 66.28 D 185865 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 66.29 D 185465 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 67.0675 D 185265 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 67.08 D 185065 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 67.81 D 184865 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 67.94 D 184665 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 68 D 184565 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 2007-08-13