Allison Transmission Holdings (ALSN) concentration risks

The company's concentration profile is broad and layered across geography, customers, and suppliers, with each dimension carrying a high disclosed share. Geographically, approximately 76% of revenues were generated in North America in 2025, a structural exposure that reflects where the end-markets for commercial vehicle transmissions are concentrated rather than any idiosyncratic sourcing decision. On the demand side, the top five OEM customers accounted for approximately 52% of net sales, a high-share dependency that runs through a handful of platform relationships; the top three — Daimler AG, PACCAR Inc., and Traton SE — contributed approximately 18%, 11%, and 10% of net sales, respectively. These figures confirm the customer mix is tilted toward a small number of large commercial vehicle OEMs rather than distributed across a broad base. The supply side amplifies the picture: approximately 75% of total spending on components was sourced from approximately 40 suppliers, many of which are the sole source for their respective components. Single-sourcing at this scale means a disruption at even one supplier can affect production without a ready alternative. Together, the three dimensions reinforce each other. A North American commercial truck downturn — itself a high-share geography — would simultaneously pressure the top-five OEM customer revenues and stress a single-sourced supply chain that has little flexibility to absorb sudden demand swings. The concentration profile warrants monitoring of OEM build schedules and supplier continuity as the primary risk channels.

For the engine’s reasoning on ALSN’s current verdict — including which dimensions drove the score — see the per-dimension breakdown.

Concentration counts reflect items disclosed in each peer’s most recent 10-K; disclosed-size classification uses TrendMatrix’s internal 10-K extraction taxonomy.