X0306 4 2022-02-10 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, Program Mgmt & Prod Pln Common Stock 2022-02-10 4 M 0 743 A 1827 D Common Stock 2022-02-10 4 M 0 14 A 1841 D Common Stock 2022-02-10 4 F 0 265 39.17 D 1576 D Restricted Stock Units 2022-02-10 4 M 0 743 0 D Common Stock 743 1487 D Dividend Equivalent Rights 2022-02-10 4 M 0 14 0 D Common Stock 14 175 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. Jacalyn C. Bolles, attorney-in-fact 2022-02-14