X0306 4 2020-02-27 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 2020-02-27 4 A 0 21216 A 1815539 D Common Shares, $.0011 par value per share 1980 I By spouse Stock Option (right to buy) 42.42 2020-02-27 4 A 0 138046 0 A 2030-02-27 Common Shares, $.0011 par value per share 138046 138046 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. /s/ Marcy Rathman, Attorney in fact 2020-03-02