X0508 4 2024-02-20 0001411207 Allison Transmission Holdings Inc ALSN 0001661939 Pittard Dana JH C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 0 1 0 0 VP, Defense Programs 1 Common Stock 2024-02-20 4 M 0 6410 23.59 A 10597 D Common Stock 2024-02-20 4 M 0 4929 37.11 A 15526 D Common Stock 2024-02-20 4 M 0 6196 43.30 A 21722 D Common Stock 2024-02-20 4 M 0 5905 49.60 A 27627 D Common Stock 2024-02-20 4 M 0 5937 43.24 A 33564 D Common Stock 2024-02-20 4 M 0 6883 43.13 A 40447 D Common Stock 2024-02-20 4 M 0 2685 39.42 A 43132 D Common Stock 2024-02-20 4 S 0 7463 67.8816 D 35669 D Common Stock 2024-02-20 4 S 0 31475 68.9124 D 4194 D Common Stock 2024-02-20 4 S 0 7 69.6900 D 4187 D Common Stock 13404 I Pittard Living Trust Employee Stock Option (right to buy) 23.59 2024-02-20 4 M 0 6410 0 D 2026-02-16 Common Stock 6410 0 D Employee Stock Option (right to buy) 37.11 2024-02-20 4 M 0 4929 0 D 2027-02-21 Common Stock 4929 0 D Employee Stock Option (right to buy) 43.30 2024-02-20 4 M 0 6196 0 D 2028-02-07 Common Stock 6196 0 D Employee Stock Option (right to buy) 49.60 2024-02-20 4 M 0 5905 0 D 2029-02-20 Common Stock 5905 0 D Employee Stock Option (right to buy) 43.24 2024-02-20 4 M 0 5937 0 D 2030-02-25 Common Stock 5937 0 D Employee Stock Option (right to buy) 43.13 2024-02-20 4 M 0 6883 0 D 2031-02-10 Common Stock 6883 0 D Employee Stock Option (right to buy) 39.42 2024-02-20 4 M 0 2685 0 D 2032-02-23 Common Stock 2685 5372 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 1, 2023. The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $67.6100 to $68.5600. The reporting person undertakes to provide Allison Transmission Holdings, Inc. ("ALSN") 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 $68.6200 to $69.6000. The reporting person undertakes to provide ALSN 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 vested on February 20, 2022. The options vested on February 25, 2023. The options vested in three equal annual installments beginning on February 10, 2022. The options vest in three equal annual installments beginning on February 23, 2023. /s/ Preston B. Ray, attorney-in-fact 2024-02-22