YC

YC makes equipment used to test semiconductor chips during manufacturing, and also produces the multilayer ceramic substrates that sit inside probe cards, the components that make direct electrical contact with silicon wafers during testing.

Its customers are semiconductor manufacturers that need to verify chip quality before the chips leave the production line. The company operates across two distinct product lines: testing equipment and the ceramic substrate components that support that testing process. It is listed on KOSDAQ, South Korea's tech-focused small-cap exchange.