ACM vs ALSN Comparison

Aecom is one of the largest global providers of advisory, design, and engineering services. It serves a broad spectrum of end markets including water, transportation, and environment. Based in Dallas, Aecom employs 51,000. The company generated $16.1 billion in sales in fiscal 2025.

Allison Transmission is the largest manufacturer of fully automatic transmissions for medium- and heavy-duty commercial vehicles. Its automatic transmissions allow customers to achieve better fuel and operator efficiency than less expensive manual and automated manual transmissions. Allison serves several end markets, including on- and off-highway equipment and military vehicles. Its on-highway business commands approximately 60% global market share. The company's transmissions can be found in Class 4-8 trucks, buses, and a limited number of large passenger vehicles (heavy-duty pickup trucks and motorhomes). Allison also produces commercial hybrid propulsion systems and is developing fully electric powertrains.