X0306 4 2020-05-05 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001286007 GRANDISSON MARC C/O ARCH CAPITAL GROUP LTD. WATERLOO HOUSE, 100 PITTS BAY ROAD PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 President & CEO Common Shares, $.0011 par value per share 2020-05-05 4 M 0 90000 8.3367 A 1905539 D Common Shares, $.0011 par value per share 2020-05-05 4 F 0 31606 23.74 D 1873933 D Common Shares, $.0011 par value per share 1980 I By spouse Share Appreciation Right 8.3367 2020-05-05 4 M 0 90000 0 A 2020-05-05 Common Shares, $.0011 par value per share 90000 0 D The share appreciation right became 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. In connection with the exercise of the share appreciation rights award described in Table II, 31,606 common shares were disposed of in satisfaction of the exercise price. The reporting person received a net issuance of 58,394 common shares. /s/ Marc Grandisson 2020-05-06