X0206 3 2022-03-14 0 0001411207 Allison Transmission Holdings Inc ALSN 0001918715 Basso Rafael C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 0 1 0 0 VP, Operations Common Stock 986 D Employee Stock Option (right to buy) 37.11 2027-02-22 Common Stock 2075 D Employee Stock Option (right to buy) 43.30 2028-02-07 Common Stock 2930 D Employee Stock Option (right to buy) 49.60 2029-02-20 Common Stock 3765 D Employee Stock Option (right to buy) 43.24 2030-02-25 Common Stock 3854 D Employee Stock Option (right to buy) 43.13 2031-02-10 Common Stock 4567 D Employee Stock Option (right to buy) 35.86 2021-10-01 Common Stock 2084 D Employee Stock Option (right to buy) 39.42 2032-02-23 Common Stock 8994 D Restricted Stock Units Common Stock 1051 D Restricted Stock Units Common Stock 830 D Restricted Stock Units Common Stock 695 D Restricted Stock Units Common Stock 2998 D Dividend Equivalent Rights Common Stock 56 D The options vested on February 22, 2020. The options vested on February 07, 2021. The options vested on February 20, 2022. The options vests on February 25, 2023. The option vests in three equal annual installments beginning on February 10, 2022. The option vests in three equal annual installments beginning on October 1, 2022. The option vests in three equal annual installments beginning on February 23, 2023. The restricted stock units ("RSUs") vest on February 25, 2023. Each RSU represents a contingent right to receive one share of Allison Transmission Holdings, Inc. common stock ("Common Stock"). RSUs earned dividend equivalents when dividends are declared on the Common Stock. The RSUs vest in three equal annual installments beginning on February 10, 2022. The RSUs vest in three equal annual installments beginning on October 1, 2022. The RSUs vest in three equal annual installments beginning on February 23, 2023. The dividend equivalent rights vest proportionately with the RSUs to which they relate. Each dividend equivalent right is the economic equivalent of one share of Common Stock. /s/ Jacalyn C. Bolles, attorney-in-fact (power of attorney filed herewith) 2022-03-22