Auto parts manufacturers occupy two distinct markets with very different characteristics. OEM supply — selling components to automakers for new vehicle production — is tied directly to vehicle build rates and is as cyclical as the auto industry itself. Aftermarket supply — selling replacement parts as existing vehicles age and require maintenance — is far more stable, driven by vehicle fleet size and age distribution rather than new vehicle sales. The EV transition is creating structural disruption throughout the components industry: electric vehicles require significantly fewer parts than internal combustion engines, eliminating revenue streams for suppliers of transmissions, exhaust systems, fuel injectors and many engine components, while creating demand for new categories like battery thermal management and power electronics. Suppliers that have positioned early in EV-relevant components are better placed than those dependent on ICE-only content. For investors, aftermarket-focused suppliers with multi-vehicle platform exposure and limited EV risk offer more defensive characteristics than OEM suppliers exposed to the disruption of legacy component categories.
