X0508 4 2024-02-10 0001411207 Allison Transmission Holdings Inc ALSN 0001878235 Eifert Thomas C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 0 1 0 0 VP, Quality, Plan & Prog Mgmt 0 Common Stock 2024-02-10 4 M 0 744 A 6439 D Common Stock 2024-02-10 4 M 0 42 A 6481 D Common Stock 2024-02-10 4 F 0 274 61.70 D 6207 D Restricted Stock Units 2024-02-10 4 M 0 744 0 D Common Stock 744 0 D Dividend Equivalent Rights 2024-02-10 4 M 0 42 0 D Common Stock 42 132 D Pefromance Stock Units 2024-02-12 4 A 0 3634 0 A Common Stock 3634 3634 D Settlement of restricted stock units ("RSUs") granted on February 10, 2021. Each RSU represents a contingent right to receive one share of Allison Transmission Holdings, Inc. ("ALSN") common stock. Settlement of dividend equivalent rights ("DERs"). The DERs accrued when and as dividends were paid on ALSN common stock and vest proportionately with the RSU to which they relate. Each DER is the economic equivalent of one share of ALSN common stock. Represents shares withheld by ALSN to satisfy tax withholding obligations on the vesting of DERs and RSUs. Each performance-based restricted stock unit ("PSU") represents a contingent right to receive one share of ALSN common stock. On February 10, 2021, the reporting person was granted PSUs with a number of PSUs earned to be determined based on the extent to which certain performance conditions were met for a performance period of 2021-2023. As determined on February 12, 2024, based on ALSN's actual performance for 2021-2023, the reporting person earned 3,634 PSUs. Earned PSUs will vest on February 28, 2024. /s/ Preston B. Ray, attorney-in-fact 2024-02-13