They're burning cash to build fabs that won't ship until 2027, yet gross margins are ripping higher right now due to a structural supply shock.
Thesis: The street treats this as a cyclical recovery; it is a structural supply shock. HBM3E consumes 3x the wafers of DDR5. Every HBM wafer processed removes three standard wafers from the pool. Micron is sold out of HBM through 2025 at fixed, accretive prices. This cannibalization of their own capacity creates a shortage in commodity DRAM, lifting pricing power on the legacy business without needing new volume. The margin expansion is mechanical, driven by mix shift, not just hope.
Verdict: LONG — Conviction: HIGH
Catalyst: Fiscal 2025 HBM revenue ramp hitting 'multiple billions' confirms the mix shift is accretive and yields are holding.
Key Risk: Yield curve failure on HBM3E 12-high stacks. Management admitted these have 'somewhat lower mature yields.' If they can't stabilize this, the margin expansion story breaks.
The Tell: When pressed on HBM4 and 12-high stack yields, Sanjay Mehrotra admitted 12-die stacks will have 'somewhat lower mature yields' immediately after claiming 'world-class mature yields' for the category. The precision dropped when discussing the next technical hurdle.
Friction Level: MODERATE_FRICTION — Bears see a 'Capacity Ceiling' capping volume upside. Bulls see the '3x Wafer Penalty' of HBM creating a shortage in standard DRAM, driving pricing power across the entire board.
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