X0508 4 2024-08-08 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 2024-08-08 4 A 0 279 0 A 6289 D These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy. The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion. The number of shares of common stock received was calculated based on $85.11, which was the closing price of the Company's common stock on the date of grant. /s/ Preston B. Ray, attorney-in-fact 2024-08-12