What it means
Advanced packaging is the step that assembles separate compute dies and memory stacks into one finished, working chip — increasingly the hardest and most capacity-constrained part of making an AI accelerator. As single-chip designs hit physical limits, the industry shifted to "chiplets": smaller pieces of silicon joined side by side (2.5D) or stacked (3D) on a shared base. CoWoS is the best-known example. Because these techniques are intricate, yield-sensitive and supplied by relatively few facilities, advanced packaging frequently caps accelerator output even when there is plenty of raw chip-printing capacity available.
Why it matters to investors
Packaging is where a lot of the AI bottleneck quietly lives. When it is the tight link, expanding it — not building more fabs — is what unlocks more accelerators, so the names that own packaging capacity and the equipment vendors that build those lines hold leverage over the whole chain above them.
Companies on this part of the chain
Named to show where the term sits in the AI supply chain — research, not advice, and never a recommendation to buy or sell.
Related terms
See Advanced packaging in the live AI chain.
THE ENTITY maps every constraint onto one live model — which part is tight now, who owns it, and who gets squeezed when it moves. Plain-English reads you can check.
THE ENTITY is an educational read on the AI supply chain — research, not investment advice. It explains how the chain works and who sits where, never price targets or buy/sell calls.