X0407 4 2023-05-03 0001411207 Allison Transmission Holdings Inc ALSN 0001942133 Ostojic Sasha C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 1 0 0 0 0 Common Stock 2023-05-03 4 M 0 2814 0 A 2814 D Restricted Stock Units 2023-05-03 4 M 0 2770 0 D Common Stock 2770 0 D Dividend Equivalent Rights 2023-05-03 4 M 0 44 0 D Common Stock 44 0 D Restricted Stock Units 2023-05-04 4 A 0 3146 0 A Common Stock 3146 3146 D Settlement of restricted stock units ("RSUs") and related dividend equivalents. Includes 44 dividend equivalents. Each RSU represents a contingent right to receive one share of Allison Transmission Holdings, Inc.'s (the "Company") common stock. On August 15, 2022, the reporting person was granted 2,770 RSUs that vested on May 3, 2023. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock. The dividend equivalent rights accrued on previously awarded RSUs and vested on May 3, 2023. The RSUs represent the reporting person's annual equity award under the Seventh Amended and Restated Non-Employee Director Compensation Policy. The RSUs vest on the date of the next annual meeting of the stockholders of the Company. Unvested RSUs earn dividend equivalents when dividends are declared on the Company's common stock. The number of RSUs received was calculated based on $46.08, which was the closing price of the Company's common stock on the date of grant. /s/ Eric C. Scroggins, Attorney-in-Fact 2023-05-05