X0306 4 2022-02-10 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 Common Stock 2022-02-10 4 M 0 764 A 3979 D Common Stock 2022-02-10 4 M 0 14 A 3993 D Common Stock 2022-02-10 4 F 0 272 39.17 D 3721 D Common Stock 9000 I Pittard Living Trust Restricted Stock Units 2022-02-10 4 M 0 764 0 D Common Stock 764 1530 D Dividend Equivalent Rights 2022-02-10 4 M 0 14 0 D Common Stock 14 205 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 RSUs and DERs. /s/ Jacalyn C. Bolles, attorney-in-fact 2022-02-14