ISC

ISC makes test sockets, the small components that hold a semiconductor chip in place during electrical testing to check whether it works correctly.

Listed on KOSDAQ, Korea's tech-focused stock exchange, it supplies these sockets to memory and non-memory chipmakers, global fabless chip designers, chip-packaging and testing houses, and makers of AI semiconductors. The company brings its entire production process in-house, which it says allows it to handle a wide variety of socket types with short lead times, and silicon sockets, which ISC was the first in the world to commercialize, account for the large majority of its revenue.