Transaction Details

Footnotes

Represents the deferred stock units ("DSUs") and dividend equivalents payable upon the reporting person's separation from service. The reporting person did not stand for re-election at Allison Transmission Holdings, Inc.'s (the "Company") 2025 annual meeting of stockholders and his term ended on May 7, 2025. | Includes 3,699 DSUs and 25 related dividend equivalents. | 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 change in control. DSUs earn dividend equivalents when dividends are declared on the Company's common stock. | On May 8, 2024, the reporting person was granted 425 DSUs that vested on May 8, 2024. | On May 9, 2024, the reporting person was granted 2,017 DSUs that vested on May 7, 2025. | On August 8, 2024, the reporting person was granted 433 DSUs that vested on August 8, 2024. | On November 8, 2024, the reporting person was granted 309 DSUs that vested on November 8, 2024. | On February 7, 2025, the reporting person was granted 235 DSUs that vested on February 7, 2025. | These DSUs represent a quarterly payment of the portion of the reporting person's annual retainer and other fees under the Company's Eighth 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. | On May 7, 2025, the reporting person was granted 280 DSUs that vested on May 7, 2025. | The number of DSUs received was calculated based on $97.23, which was the closing price of the Company's common stock on the date of grant. | 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 DSUs and were payable on May 7, 2025, the date of the reporting person's separation from service.