X0306 4 2018-05-07 0 0000947484 ARCH CAPITAL GROUP LTD. ACGL 0001304230 Vollaro John D WATERLOO HOUSE, GROUND FLOOR 100 PITTS BAY ROAD PEMBROKE D0 HM 08 BERMUDA 1 0 0 0 Common Shares, $.0033 par value per share 2018-05-07 4 M 0 36000 23.10 A 36000 D Common Shares, $.0033 par value per share 2018-05-07 4 F 0 10510 79.13 D 25490 D Common Shares, $.0033 par value per share 2018-05-07 4 G 0 25490 0 D 0 D Common Shares, $.0033 par value per share 2018-05-07 4 G 0 25490 0 A 143506 I by Trust Share Appreciation Right 23.10 2018-05-07 4 M 0 36000 0 D 2018-05-09 Common Shares, $.0033 par value per share 36000 0 D Such common shares are held by a revocable trust for which the reporting person serves as trustee. In connection with the exercise of a share appreciation right as described in Table II, 10,510 shares were disposed of in satisfaction of the exercise price; 25,490 net shares were issued. The share appreciation right became exercisable in three equal installments, with the first installment exercisable on May 9, 2009 and the second and third installments exercisable on May 9, 2010 and May 9, 2011, subject to the applicable award agreement. On May 7, 2018, the reporting person contributed such shares to a revocable trust for which he serves as trustee. /s/ John Vollaro 2018-05-08