Transaction Details

Footnotes

These shares represent a quarterly payment of the reporting person's annual retainer under the Allison Transmission Holdings, Inc. (the "Company") Eighth 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 $97.23, 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 equivalents. | Includes 20 dividend equivalents. | Each RSU represents a contingent right to receive one share of the Company's common stock. | On May 9, 2024, the reporting person was granted 2,017 RSUs that vested on May 7, 2025. | 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 7, 2025. | The RSUs represent the reporting person's annual equity award under the Company's Eighth 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 $98.72, which was the closing price of the Company's common stock on the date of grant.