Gentex Corporation GNTX

The business

Gentex makes the auto-dimming rearview mirrors that ≈90% of new vehicles globally include as a premium option, plus the electronics built around them: HomeLink garage openers, camera-based Full Display Mirrors (FDM), and dimmable aircraft windows for Boeing and Airbus widebodies. The Automotive segment is the engine: ≈98% of revenue, with the Other segment (fire protection, dimmable aerospace glass, medical) at the remaining ≈2%. Inside Automotive, interior mirrors carry the franchise at about 70% of unit shipments and the highest margins; exterior mirrors and electronics fill out the rest. Global unit share in auto-dimming mirrors sits near 63%, a position Gentex has held for two decades.

The qualitative fact the financials don't show: Gentex's content-per-vehicle is rising even when global light-vehicle SAAR is flat. FDM (a camera-fed mirror that replaces the rear glass view with a clean video feed) attaches at roughly 3× the price of a base auto-dimming mirror and is the lever for the next five years. FY25 saw mirror unit shipments up ≈12% year-on-year against a global light-vehicle production base that grew low-single-digits, with FDM penetration still in the high single digits of Gentex's own mix. The runway is the gap between today's attach rate and the 30%-plus FDM penetration management has guided toward by the end of the decade.