Lam Research — AI supply-chain exposure

Lam Research makes the etch and deposition equipment that carves and layers the microscopic structures on a chip, sitting well upstream in the value chain as a semiconductor capital-equipment supplier. Before any GPU or memory die exists, a fab has to be tooled — and Lam's machines are among the tools that build it. Its brief flags foundry capacity and high-bandwidth memory as its key exposures, because those are the parts of the chain its equipment most directly enables.

The structural hook is memory scaling. Building HBM means stacking many DRAM dies and drilling the vertical connections between them, and each added layer multiplies the etch and deposition steps Lam sells — so the same bottleneck that constrains AI accelerators pulls demand through to its tools. It belongs to a very small club of firms that can do this at leading edge, which is the source of its pricing power: memory cannot scale vertically without equipment like this.