X0508 4 2024-02-28 0001411207 Allison Transmission Holdings Inc ALSN 0001687117 Coll John C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 0 1 0 0 SVP, Global MSS 0 Common Stock 2024-02-28 4 S 0 5800 75.7190 D 12788 D Common Stock 8906 I By John Coll Living Trust dated 5/2/2005 The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $75.5200 to $75.9300. 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. /s/ Preston Ray, attorney-in-fact 2024-02-29