Technology thesis · Semiconductors & Chips
high conviction growthHigh-bandwidth memory (HBM)
HBM is the memory bottleneck in AI chip production; SK Hynix dominates with 50%+ market share and margins that would make a drug company envious.
Position maintained continuously · last reviewed May 7, 2026
The thesis
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
Technology-native KPIs
Metrics that predict trajectory, tracked over time
Landscape map
Who builds what — and who depends on whom
Catalyst calendar
Dated events that will move the position
Technology roadmap
Milestones on the path to maturity
Watchlists
Companies, people and papers — each with a remove-by condition
Decision frameworks
The same call, framed for your desk
Thesis changelog
When our view changed, and why
Change our mind
3 disconfirming conditions
The rest is inside
You've read the verdict. The file is much deeper.
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 the changelog of every time our call on High-bandwidth memory (HBM) has changed — all live inside CanaryIQ.