High-bandwidth memory (HBM)
Suppliers report that HBM4 is shipping commercially, but new production capacity takes years to build. How much AI compute can ship depends on qualification, yields and usable supply more than on the bandwidth in roadmaps.
Research snapshot · updated Nov 12, 2026
Core thesis
Every AI GPU requires HBM memory stacked on the chip via advanced packaging. SK Hynix leads (50%+ share), Samsung races to qualify for Nvidia, and Micron is the US champion. HBM3E margins are estimated at 5-10x conventional DRAM. Demand is structurally insatiable — each new GPU generation requires more HBM. The supply chain: SK Hynix (Korea) → TSMC CoWoS (Taiwan) → Nvidia GPU (designed US, made Taiwan).
State of the art (2026)
HBM4 has gone from roadmap to revenue. NVIDIA's Vera Rubin platform entered full production in June 2026 with SK Hynix, Samsung and Micron all certified as HBM4 suppliers. Micron's 36GB 12-high HBM4 (>2.8 TB/s, 11+ Gb/s/pin) reached volume shipment in Q1 2026; Samsung hit mass production in February at 11.7 Gb/s and showed HBM4E at GTC 2026; SK Hynix slipped its HBM4 ramp to Q3 2026 yet still holds roughly 60–70% of Rubin allocation. Overall share sits near SK Hynix 50–55%, Samsung 35–40%, Micron 5–10%, with Samsung the clear recoverer. Demand is up about 70% year on year and Micron has sold out its 2026 HBM output. The duopoly-plus-one structure is now real, not aspirational.
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Signal stack
Evidence stacked leading → lagging
10 signals
Signal stack
Evidence stacked leading → lagging
Technology-native KPIs
Metrics that predict trajectory, tracked over time
6 tracked
Technology-native KPIs
Metrics that predict trajectory, tracked over time
Landscape map
Who builds what, and who depends on whom
71 players · 6 layers
Landscape map
Who builds what, and who depends on whom
Catalyst calendar
Dated events that will move the position
4 ahead
Catalyst calendar
Dated events that will move the position
Technology roadmap
Milestones on the path to maturity
17 milestones
Technology roadmap
Milestones on the path to maturity
Watchlists
Companies, people and papers, each with a condition for removing it
20 · 20
Watchlists
Companies, people and papers, each with a condition for removing it
Decision frameworks
What our view means for your job
Locked
Decision frameworks
What our view means for your job
Thesis changelog
When our view changed, and why
8 updates
Thesis changelog
When our view changed, and why
Change our mind
3 disconfirming conditions
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The full signal stack, technology-native KPIs tracked over time, the landscape of who depends on whom, the dated catalyst calendar, decision frameworks for every desk, live watchlists and a record of every time our view on High-bandwidth memory (HBM) has changed. All of it is in CanaryIQ.