Form 4 Filing for Carolann I. Haznedar

This Form 4 filing details a transaction by Carolann I. Haznedar, a director at Allison Transmission Holdings Inc. The transaction, which occurred on August 31, 2026, involved the acquisition of 52 Dividend Equivalent Rights. These rights are economically equivalent to shares of common stock and accrued on previously awarded deferred stock units. The acquisition price was $0.0, and following this transaction, Ms. Haznedar holds 1607 shares. The underlying security for these rights is the Common Stock of Allison Transmission Holdings Inc. The filing was signed by Preston B. Ray as Attorney-in-Fact on September 2, 2026. This transaction is classified as an officer/director change due to the nature of equity holdings by a director.