X0303 4 2008-11-06 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 2008-11-06 4 M 0 50000 20.00 A 234565 D Common Shares, $.01 par value per share 2008-11-06 4 S 0 22400 60.72 D 212165 D Common Shares, $.01 par value per share 2008-11-06 4 S 0 16200 61.38 D 195965 D Common Shares, $.01 par value per share 2008-11-06 4 S 0 9400 62.65 D 186565 D Common Shares, $.01 par value per share 2008-11-06 4 S 0 2000 63.07 D 184565 D Common Shares, $.01 par value per share 2008-11-07 4 M 0 50000 20.00 A 234565 D Common Shares, $.01 par value per share 2008-11-07 4 S 0 1300 59.93 D 233265 D Common Shares, $.01 par value per share 2008-11-07 4 S 0 33001 60.49 D 200264 D Common Shares, $.01 par value per share 2008-11-07 4 S 0 15699 61.17 D 184565 D Stock Option (right to buy) 20.00 2008-11-06 4 M 0 50000 20.00 D 2013-10-23 Common Shares, $.01 par value per share 50000 372407 D Stock Option (right to buy) 20.00 2008-11-07 4 M 0 50000 20.00 D 2013-10-23 Common Shares, $.01 par value per share 50000 322407 D The stock option became fully exercisable on October 23, 2003. Represents a weighted average sale price; the sales prices ranged from $60.32 to $60.99. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Represents a weighted average sale price; the sales prices ranged from $61 to $61.98. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Represents a weighted average sale price; the sales prices ranged from $62 to $62.98. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Represents a weighted average sale price; the sales prices ranged from $63.01 to $63.16. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Represents a weighted average sale price; the sales prices ranged from $59.83 to $59.95. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Represents a weighted average sale price; the sales prices ranged from $60.02 to $60.91. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Represents a weighted average sale price; the sales prices ranged from $61.03 to $61.34. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer or a security holder of the issuer. Louis Petrillo Attorney in fact 2008-11-07