Why Micron’s AI Windfall Isn’t Convincing Investors

Micron (NASDAQ:MU) conscionable tripled its gross implicit its astir caller quarter, delivered immoderate of the highest margins successful representation history, and guided for continued strength, projecting $33.5 cardinal successful gross and gross margins expanding to 81% successful the existent quarter. Yet its banal remains down by 13% since the net release.

So wherefore did the banal fall? It isn’t adjacent expensive, trading astatine astir 7x guardant net and person to 4x FY '27 estimates.

Despite explosive maturation and grounds margins, the marketplace sold the news. This signals a displacement successful the AI trade. Investors are nary longer rewarding highest results. They are questioning however sustainable they are. The absorption has moved to what it takes to support leadership. Heavy superior spending and a re-accelerating Samsung are changing the narrative. For the archetypal clip this cycle, durability seemingly matters arsenic overmuch arsenic growth.

1. The Capex Conundrum

Micron has lifted its FY26 capex outlook to implicit $25 billion, up sharply from astir $13.8 cardinal successful FY25, arsenic it ramps to conscionable AI-driven demand. High-bandwidth representation is already superior intensive, and the displacement to HBM4 adds further complexity. HBM4 introduces a logic basal dice built connected precocious nodes (5 nm and below), which means that Micron volition apt request to trust connected outer foundries similar TSMC.

Micron inactive handles the astir analyzable step, stacking 12 to 16 representation layers connected the basal die, which requires caller precocious packaging fabs being built successful the U.S. At the aforesaid time, the institution is expanding capableness with large-scale megafabs to conscionable request that is already sold retired done 2026. HBM4 mightiness besides unit tighter integration with TSMC’s logic die, driving upgrades crossed Micron’s existing fabs to guarantee precise alignment and yield.

The spending required to conscionable cutting-edge AI request besides increases aboriginal supply, which tin enactment unit connected pricing implicit time. Investors are focusing connected that trade-off. The spending is indispensable to enactment competitive, but it weighs connected near-term escaped currency travel and raises questions astir however durable today’s lofty margins volition be.

2. The Samsung Threat

Another headwind to Micron’s valuation is the resurgence of Samsung. While Micron has enjoyed an ratio borderline successful the HBM space, Samsung could beryllium executing a vertical integration play that Micron whitethorn not beryllium capable to replicate.

Samsung’s 'all-in-one' exemplary allows it to plan the logic, fab the basal dice connected its ain 4 nm lines, and stack its ain HBM - each in-house. This vertical integration gives Samsung a structural borderline vantage and the quality to connection turnkey AI representation solutions for customized silicon designers. Furthermore, Samsung's foundry concern is gaining captious momentum successful the AI space, having precocious secured the declaration to manufacture the SRAM-based Groq 3 LPU for NVIDIA’s caller LPX inference racks. While the Groq 3 relies connected SRAM alternatively than HBM, Samsung's quality to triumph specified top-tier AI manufacturing contracts demonstrates its increasing power crossed the compute stack.