Form 4 Filing for David S. Graziosi

This filing details transactions made by David S. Graziosi, Chair, President, and CEO of Allison Transmission Holdings Inc. (ALSN), on February 22, 2026. The transactions include the settlement of 10,474 Restricted Stock Units (RSUs) and 240 Dividend Equivalent Rights (DERs) related to RSUs granted on February 22, 2024. Additionally, 13,418 RSUs and 561 DERs related to RSUs granted on February 22, 2023, were settled. A total of 10,502 shares were withheld to cover tax obligations, with a transaction price of $118.85 per share. Following these transactions, Mr. Graziosi directly holds 260,663 shares of ALSN common stock.