Rambus — AI supply-chain exposure

Rambus designs memory-interface chips and licenses the controller and security IP that let processors talk to high-bandwidth and standard DRAM. It doesn't make memory or logic itself; it sits in the chips layer as a designer of interface blocks — HBM and DDR controllers, plus security IP — that get built into other companies' accelerators and custom ASICs.

The structural hook is that as memory bandwidth becomes the binding constraint in AI, the interface between compute and memory grows more valuable, and Rambus is one of the few independent suppliers of that connective IP. Its business is licensing and royalties rather than fabrication, so it earns a small toll across a wide swath of the memory and custom-silicon ecosystem. That breadth — being embedded in many designs without competing to build any single chip — is what places it in the chain despite its modest footprint.