X0508 4 2026-02-13 0001411207 Allison Transmission Holdings Inc ALSN 0001741824 Bohley G Frederick C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 false true false false Allison COO,Pres.&BU Leader AT true Common Stock 2026-02-13 4 M false 10348 23.59 A 109422 D Common Stock 2026-02-13 4 S false 1128 115.4129 D 108294 D Common Stock 2026-02-13 4 S false 4508 115.9983 D 103786 D Common Stock 2026-02-13 4 S false 4712 117.0229 D 99074 D Common Stock 360 I By Spouse Employee Stock Option (right to buy) 23.59 2026-02-13 4 M false 10348 0 D 2026-02-17 Common Stock 10348 0 D This sale was pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 26, 2025. The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $114.5625 to $115.5600. 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 $115.5700 to $116.5564. 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 $116.5730 to $117.5400. 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. This option vested on February 17, 2019. /s/ Preston B. Ray, attorney-in-fact 2026-02-17