X0306 4 2022-05-04 0001411207 Allison Transmission Holdings Inc ALSN 0001241605 RABAUT THOMAS W C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 1 0 0 0 Common Stock 2022-05-04 4 A 0 535 0 A 1686 D Common Stock 2022-05-04 4 M 0 2985 0 A 4671 D Common Stock 63163 I Thomas Willi Rabaut Living Trust DTD 7/23/1999 Restricted Stock Units 2022-05-04 4 M 0 2927 0 D Common Stock 2927 0 D Dividend Equivalent Rights 2022-05-04 4 M 0 58 0 D Common Stock 58 55 D Restricted Stock Units 2022-05-05 4 A 0 3746 0 A Common Stock 3746 3746 D These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Fifth 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 $39.69, which was the closing price of the Company's common stock on the date of grant. Settlement of restricted stock units ("RSUs") and related dividend equivalent. Includes 58 dividend equivalents. Each RSU represents a contingent right to receive one share of the Company's common stock. On May 6, 2021, the reporting person was granted 2,927 RSUs that vested on May 4, 2022. 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 4, 2022. The RSUs represent the reporting person's annual equity award under the Company's Sixth 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 $38.70, which was the closing price of the Company's common stock on the date of grant. /s/ Jacalyn C. Bolles, attorney-in-fact 2022-05-06