X0306 4 2020-02-27 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001769539 Gansberg David C/O ARCH CAPITAL GROUP LTD. WATERLOO HOUSE, 100 PITTS BAY ROAD PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 CEO, Global Mortgage Group Common Shares, $.0011 par value per share 2020-02-27 4 A 0 6129 A 117164 D Common Shares, $.0011 par value per share 9000 I With spouse Common Shares, $.0011 par value per share 2020-02-28 4 F 0 789 40.43 D 116375 D Stock Option (right to buy) 42.42 2020-02-27 4 A 0 39880 0 A 2030-02-27 Common Shares, $.0011 par value per share 39880 39880 D Represents restricted shares that vest in three equal annual installments, commencing February 27, 2021 and the next two installments on February 27, 2022 and February 27, 2023, subject to the applicable award agreement. The stock option becomes exercisable in three equal annual installments commencing February 27, 2021 and the next two installments on February 27, 2022 and February 27, 2023, subject to the applicable award agreement. Represents shares withheld to pay taxes due upon vesting of restricted stock. /s/ Marcy Rathman, Attorney in fact 2020-03-02