Hanmi Semiconductor Co., Ltd. — AI supply-chain exposure

Hanmi Semiconductor is a Korean back-end equipment maker. Its thermo-compression bonders are the leading tools for stacking the DRAM dies that make high-bandwidth memory — the layered chips fused beside AI accelerators to feed them data fast enough to stay busy. HBM is assembled by bonding many thin dies into a precise vertical stack, and Hanmi's machines perform that bonding step. With SK hynix as a flagship customer, it sits at a narrow point in the chip layer as a supplier into HBM.

Its hook is leverage over a bottleneck. HBM has been the tightest link in AI for over a year, and the tools that stack it come from a very small group — which puts Hanmi upstream of the memory scarcity, selling the picks-and-shovels every HBM maker needs to add capacity. As bonding shifts toward more advanced techniques for taller stacks, that tooling position could either deepen or be challenged by rival methods. The mid-weight placement reflects a company that is structurally important but singular — its fortunes bound to memory-makers' capacity plans and to holding its lead in bonding technology.