X0407 4 2023-05-03 0001411207 Allison Transmission Holdings Inc ALSN 0001171774 LAVIN RICHARD P C/O ALLISON TRANSMISSION HOLDINGS, INC. ONE ALLISON WAY INDIANAPOLIS IN 46222 1 0 0 0 0 Deferred Stock Units 2023-05-03 4 A 0 547 0 A Common Stock 547 24863 D Deferred Stock Units 2023-05-04 4 A 0 3146 0 A Common Stock 3146 28009 D These deferred stock units ("DSUs") represent a quarterly payment of the portion of the reporting person's annual retainer and other fees under the Allison Transmission Holdings, Inc. (the "Company") Sixth Amended and Restated Non-Employee Director Compensation Policy deferred pursuant to the Company's Amended and Restated Non-Employee Director Deferred Compensation Plan. The annual retainer and other fees are payable quarterly in arrears. Each DSU is the economic equivalent of one share of the Company's common stock. The DSUs become payable, in common stock, or at the Company's election cash, at the earlier of the reporting person's separation from service or a change in control. DSUs earn dividend equivalents when dividends are declared on the Company's common stock. The number of DSUs received was calculated based on $47.47, which was the closing price of the Company's common stock on the date of grant. The DSUs represent the portion of the reporting person's annual equity award under the Seventh Amended and Restated Non-Employee Director Compensation Policy deferred pursuant to the Company's Amended and Restated Non-Employee Director Deferred Compensation Plan. The DSUs vest on the date of the next annual meeting of the stockholders of the Company. The number of DSUs 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 Scroggins, Attorney-in-Fact 2023-05-05