X0508 4 2024-02-16 0001411207 Allison Transmission Holdings Inc ALSN 0001543492 Graziosi David S. C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 1 1 0 0 Chairman, President and CEO 0 Common Stock 2024-02-16 4 S 0 66623 71.0213 D 119284 D Common Stock 2024-02-16 4 S 0 1443 71.5326 D 117841 D The price reported is a weighted average price. The shares were sold in multiple transactions at per share prices ranging from $70.4600 to $71.4500. 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 $71.4800 to $71.5900. 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. /s/ Preston B. Ray, attorney-in-fact 2024-02-20