X0306 4 2023-02-21 0001411207 Allison Transmission Holdings Inc ALSN 0001543507 Scroggins Eric C. C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 0 1 0 0 VP, Gen. Counsel & Secretary Common Stock 2023-02-21 4 M 0 5878 23.59 A 6484 D Common Stock 2023-02-21 4 M 0 4401 37.11 A 10885 D Common Stock 2023-02-21 4 M 0 5787 43.30 A 16672 D Common Stock 2023-02-21 4 M 0 5378 43.13 A 22050 D Common Stock 2023-02-21 4 S 0 12264 48.3256 D 9786 D Common Stock 2023-02-21 4 S 0 5541 49.1532 D 4245 D Employee Stock Option (right to buy) 23.59 2023-02-21 4 M 0 5878 0 D 2026-02-16 Common Stock 5878 0 D Employee Stock Option (right to buy) 37.11 2023-02-21 4 M 0 4401 0 D 2027-02-21 Common Stock 4401 0 D Employee Stock Option (right to buy) 43.30 2023-02-21 4 M 0 5787 0 D 2028-02-07 Common Stock 5787 0 D Employee Stock Option (right to buy) 43.13 2023-02-21 4 M 0 5378 0 D 2031-02-10 Common Stock 5378 2689 D The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $47.6926 to $48.6800. The reporting person undertakes to provide Allison Transmission Holdings, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $48.6900 to $49.5250. The reporting person undertakes to provide Allison Transmission Holdings, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The options vested on February 17, 2019. The options vested on February 22, 2020. The options vested on February 7, 2021. The options vest in three equal annual intallments beginning on February 10, 2022. /s/ Eric C. Scroggins 2023-02-23