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 0 200 64.31 D 199365 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 64.75 D 199265 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 300 64.76 D 198965 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 64.9 D 198765 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 64.97 D 198565 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 64.98 D 198165 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 64.99 D 197765 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 900 65 D 196865 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 65.0025 D 196665 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 65.01 D 196465 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 65.03 D 196065 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 65.0425 D 195665 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 500 65.05 D 195165 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 700 65.06 D 194465 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 65.07 D 194265 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.11 D 194165 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 65.12 D 193765 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 400 65.13 D 193365 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 700 65.15 D 192665 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 65.17 D 192465 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.2 D 192365 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.205 D 192265 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.235 D 192165 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 200 65.26 D 191965 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.27 D 191865 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 82 65.35 D 191783 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 100 65.37 D 191683 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 218 65.48 D 191465 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 66 65.5 D 191399 D Common Shares, $.01 par value per share 2007-08-09 4 S 0 134 65.51 D 191265 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