UIL

UIL makes physical components for smartphones, including key buttons, metal casings, waterproofing and heat-dissipation parts, wireless chargers, and wearable accessories, as well as parts for e-cigarette devices and injection-moulded interior and exterior components for vehicles.

It supplies these parts to manufacturers and is listed on KOSDAQ, South Korea's tech-focused small-cap exchange. Mobile-phone components account for the large majority of its revenue, with e-cigarette parts and automotive components making up smaller but growing shares of the business.