Allison Transmission Announces First Quarter 2025 Results Exhibit 99.1 INDIANAPOLIS, May 1, 2025 – Allison Transmission Holdings Inc. (NYSE: ALSN), today reported first quarter net sales of $766 million, with top-line performance driven by strength in the North America On-Highway and Defense end markets. David S. Graziosi, Chair and Chief Executive Officer of Allison Transmission commented, "Allison is well-positioned to navigate current trade uncertainties, utilizing our global footprint to provide our Nor ...