BorgWarner is a Tier I auto-parts supplier with four operating segments. The air management group makes turbochargers, e-boosters, e-turbos, timing systems, emissions systems, thermal systems, gasoline ignition technology, powertrain sensors, cabin heaters, battery heaters, and battery charging. The e-propulsion and drivetrain group produces e-motors, power electronics, control modules, software, automatic transmission components, and torque management products. The two remaining operating segments are the eponymous fuel injector and aftermarket groups. The company's largest customers are Ford and Volkswagen at 10% and 9% of 2021 revenue, respectively. Geographically, Europe accounted for 35% of 2021 revenue, while Asia was 35% and North America was 29%.