X0306 4 2018-07-24 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001741826 Morin Francois C/O ARCH CAPITAL GROUP LTD. WATERLOO HOUSE, 100 PITTS BAY ROAD PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 EVP and CFO Common Shares, $.0011 par value per share 2018-07-24 4 A 0 6179 A 32885 D Common Shares, $.0011 par value per share 79491 I Owned with spouse Stock Option (right to buy) 29.13 2018-07-24 4 A 0 27534 0 A 2028-07-24 Common Shares, $.0011 par value per share 27534 27534 D The amount of common shares includes common shares acquired in connection with a 3-for-1 share split effectuated by Arch Capital Group Ltd. on June 21, 2018. Represents restricted shares that vest in three equal annual installments, commencing July 24, 2019, and the next two installments on July 24, 2020 and July 24, 2021, subject to the applicable award agreement. The stock option becomes exercisable in three equal annual installments commencing July 24, 2019, and the next two installments on July 24, 2020 and July 24, 2021, subject to the applicable award agreement. /s/ Francois Morin 2018-07-26