X0306 4 2020-02-27 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001718249 Rajeh Maamoun C/O ARCH CAPITAL GROUP LTD 100 PITTS BAY ROAD, WATERLOO HOUSE PEMBROKE D0 HM 08 BERMUDA 0 1 0 0 Chairman & CEO Arch Re Group Common Shares, $.0011 par value per share 2020-02-27 4 A 0 6129 A 308646 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. /s/ Maamoun Rajeh 2020-02-29