X0306 4 2021-11-12 0001140859 AMERISOURCEBERGEN CORP ABC 0001412636 Chou John G. 1 WEST FIRST AVENUE CONSHOHOCKEN PA 19428 1 Executive Vice President Common Stock 2021-11-12 4 A 0 23442 A 92186 D Common Stock 2021-11-12 4 F 0 10193 119.45 D 81993 D Common Stock 2021-11-14 4 M 0 4689 A 86682 D Common Stock 2021-11-14 4 F 0 2039 125.34 D 84643 D Restricted Stock Units 2021-11-14 4 M 0 4689 0 D Common Stock 4689 0 D Shares were received for no consideration upon the satisfaction of performance criteria underlying an award of performance share units. Grant of restricted stock units received on November 14, 2018 for no consideration and vested 100% on the third anniversary of the date of grant. /s/ John G. Chou 2021-11-15