L3 · HBM & Packaging
Top HBM & Advanced Packaging Companies
HBM & DRAM, CXL, CoWoS / SoIC, glass substrates.
Last updated: · weekly
High-bandwidth memory and advanced packaging are the bottleneck of every large training cluster. The layer is a concentrated one: a handful of memory makers produce HBM stacks, and a handful of foundry and OSAT players provide the 2.5D/3D packaging (CoWoS, SoIC, hybrid bonding) that bonds memory to logic. A short list here is honest, not incomplete.
This roster lists the companies the engine tracks in the HBM & Advanced Packaging layer (L3) of the AI-infrastructure stack, defined by the V15.1 taxonomy charter as the memory-bandwidth and advanced-packaging bottleneck of every training cluster. It is a directory of who operates in the layer — not a market-share ranking. For an activity-based ranking and the underlying signals, follow the leaderboard and index links below.
Companies in this layer
6Source: engine canonical_companies registry, primary_layer = L3 (V15.1 taxonomy)
| Company | Ticker | Status | HQ |
|---|---|---|---|
| Amkor Technology | AMKR | Public | US |
| ASE Technology | ASX | Public | TW |
| Micron Technology | MU | Public | US |
| Samsung Electronics | 005930.KS | Public | KR |
| SK Hynix | 000660.KS | Public | KR |
| TSMC | TSM | Public | TW |
How this list is built
The memory-bandwidth and advanced-packaging bottleneck of every training cluster. Companies are sourced from the engine's canonical company registry, filtered to the L3 layer of the V15.1 taxonomy. This is a roster of who operates in the layer, not a subjective ranking. For an activity-based ranking (hiring + business signals) see the L3 leaderboard and the layer index on /indices.
Topics in this layer
FAQ
- What is the HBM & Advanced Packaging (L3) layer?
- In the V15.1 AI-infrastructure taxonomy, L3 covers HBM & DRAM, CXL, and advanced packaging (CoWoS / SoIC, glass substrates) — the memory-bandwidth and advanced-packaging bottleneck of every training cluster.
- Why are there only a handful of companies?
- HBM and advanced packaging are a structurally concentrated oligopoly: a few memory makers (Micron, SK Hynix, Samsung) and a few packaging/foundry players (TSMC, ASE, Amkor). The short roster reflects the real market structure rather than missing data.
- How is this company list built?
- Companies are sourced from the engine's canonical_companies registry, filtered to primary_layer = L3 under the V15.1 taxonomy. It is a roster of companies operating in the layer, not a subjective ranking; for an activity-based ranking see the L3 leaderboard.