X0306 4 2021-11-09 0001140859 AMERISOURCEBERGEN CORP ABC 0001191508 COLLIS STEVEN H 1 WEST FIRST AVENUE CONSHOHOCKEN PA 19428 1 1 Chairman, President & CEO Common Stock 2021-11-09 4 M 0 12784 98.24 A 197363 D Common Stock 2021-11-09 4 M 0 11480 75.61 A 208843 D Common Stock 2021-11-09 4 S 0 24264 125.33 D 184579 D Common Stock 2021-11-10 4 M 0 12718 A 197297 D Common Stock 2021-11-10 4 F 0 5530 125.68 D 191767 D Non-qualified Stock Option (Right to Buy) 75.61 2021-11-09 4 M 0 11480 0 D 2023-11-09 Common Stock 11480 172200 D Non-qualified Stock Option (Right to Buy) 98.24 2021-11-09 4 M 0 12784 0 D 2022-11-11 Common Stock 12784 38351 D Restricted Stock Units 0 2021-11-10 4 M 0 12718 0 D Common Stock 12718 25437 D Restricted Stock Units 0 2021-11-10 4 A 0 35806 A Common Stock 35806 35806 D Grant of restricted stock units received for no consideration that vest in three equal annual installments on 11/10/2021, 11/10/2022, and 11/10/2023. The sale of stock reflected in this Form 4 was affected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person effective 8/20/21 and disclosed in the Company's 8-K filed with the Securities and Exchange Commission on 8/26/21. Exercisable in four equal annual installments on 11/9/17, 11/9/18, 11/9/19 and 11/9/20. Exerciseable in four equal annual installments on 11/11/16, 11/11/17, 11/11/18 and 11/11/19. Grant of restricted stock units received for no consideration that vest in three equal annual installments on 11/10/2022, 11/10/2023, and 11/10/2024. /s/ John G. Chou, attorney-in-fact for Steven H. Collis 2021-11-12