X0306 4 2020-05-06 0001411207 Allison Transmission Holdings Inc ALSN 0001195347 ASKREN STANLEY A ONE ALLISON WAY INDIANAPOLIS IN 46222 1 0 0 0 Deferred Stock Units 2020-05-06 4 A 0 596 0 A Common Stock 596 4912 D Deferred Stock Units 2020-05-07 4 A 0 3600 0 A Common Stock 3600 8512 D These deferred stock units ("DSUs") respresent 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 ("Policy"). The annual retainer is paid quarterly in arrears in cash or common stock at the reporting person's discretion. 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 shares of common stock received was calculated based on $35.64, 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 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 $36.11, which was the closing price of the Company's common stock on the date of grant. /s/Jacalyn Bolles, Attorney-in-Fact 2020-05-08