X0303 4 2010-05-05 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001460835 Hele John C.R. WESSEX HOUSE, 4TH FLOOR 45 REID STREET HAMILTON D0 HM 12 BERMUDA 0 1 0 0 EVP, CFO & Treasurer Common Shares, $.01 par value per share 2010-05-05 4 A 0 7600 A 40200 D Stock Appreciation Right 75.03 2010-05-05 4 A 0 7600 0 A 2020-05-05 Common Shares, $.01 par value per share 7600 7600 D Represents restricted shares that vest in three equal annual installments on May 5th in each of 2011, 2012 and 2013, subject to the applicable award agreement. The stock appreciation right will become exercisable in three equal annual installments, with the first installment becoming exercisable on May 5, 2011 and the next two installments on May 5, 2012 and May 5, 2013, subject to the applicable award agreement. /s/ Louis T. Petrillo Attorney in Fact 2010-05-07