Transaction Details

Footnotes

The deferred stock units ("DSUs") represent the portion of the reporting person's annual equity award under the Allison Transmission Holdings, Inc. (the "Company") Eighth Amended and Restated Non-Employee Director Compensation Policy deferred pursuant to the Company's Amended and Restated Non-Employee Director Deferred Compensation Plan. | 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 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 $98.72, which was the closing price of the Company's common stock on the date of grant.