Key Highlights

  • Micron Technology (Nasdaq: MU) on the Nasdaq Global Select Market reported Cloud Memory Business Unit (CMBU) Revenue of $13.52 billion in FY2025, up from $1.87 billion in FY2023 — a 623% increase in two fiscal years driven primarily by HBM Demand.
  • In Q2 FY2026, CMBU generated $7.75 billion in revenue with Operating Income of $5.13 billion, a segment Margin/">Operating Margin of 66% — the highest of Micron's four business units.
  • Micron began Volume production of HBM3E 8-high 24GB in 2024; by Q4 FY2025, HBM3E 12-high represented the majority of HBM shipments. HBM4 36GB 12-high samples have been delivered to multiple key customers with volume production targeted for calendar 2026.
  • HBM is manufactured using through-silicon via (TSV) stacking technology that physically bonds DRAM dies on top of the GPU — a process so technically demanding that only three companies in the world currently produce it at commercial scale.
  • Netlist filed Patent infringement complaints specifically targeting Micron's HBM products in May 2025, and YMTC's patent complaints also cover certain DRAM products — legal validation that HBM has become valuable enough to fight over.

 

The most reliable signal that a technology has crossed from niche application to commercial mainstream is not adoption statistics or analyst forecasts. It is patent litigation. When a product category generates enough revenue that established players and patent assertion entities begin filing infringement claims, the commercial reality of that product's importance has been confirmed in the most objective way possible: the courts. HBM — high-bandwidth memory — has reached that threshold. Micron Technology, Inc. (NASDAQ: MU) is at the centre of this transition.

What HBM Actually Is

High-bandwidth memory addresses the fundamental bottleneck in accelerated computing: the speed at which data can be moved between the memory subsystem and the processing cores. A conventional DRAM module connects to a GPU via a relatively narrow bus, creating a bandwidth constraint that limits how fast the GPU can access the data it needs to perform calculations. HBM solves this by physically stacking multiple DRAM dies on top of each other using through-silicon vias — microscopic vertical electrical connections that pass through the semiconductor material itself — and mounting the resulting stack directly on the same substrate as the GPU. The physical proximity and the width of the resulting connection bus delivers bandwidth that conventional DRAM cannot approach.

Micron's FY2025 10-K describes HBM3E as having increased bandwidth and superior power efficiency enabled by the advanced 1β process node. The 12-high configuration stacks twelve DRAM dies in a single package, delivering a capacity of 36 gigabytes per stack in the HBM3E generation and greater capacity in HBM4. For AI Training workloads that must hold model weights and activation data in memory during gradient computation, this combination of bandwidth and capacity is not a convenience — it is a prerequisite.

The Revenue Trajectory

CMBU — Micron's Cloud Memory Business Unit, which houses HBM alongside other data centre DRAM products — generated revenue of $1.87 billion in FY2023, $3.79 billion in FY2024, and $13.52 billion in FY2025. The compound growth rate over two fiscal years exceeds 170% per annum. In a single quarter — Q2 FY2026 — CMBU generated $7.75 billion in revenue, more than four times the unit's entire FY2023 annual revenue. This is not a product in early commercialisation. It is a product in the middle of a demand wave that has structurally outgrown Supply.

The operating Economics at the segment level are equally revealing. In Q2 FY2026, CMBU operating income was $5.13 billion on revenue of $7.75 billion — an operating margin of 66%. By contrast, the Mobile and Client Business Unit (MCBU) generated operating income of $1.68 billion on revenue of $4.43 billion — a 38% operating margin. The HBM-driven CMBU margin premium over the consumer-facing MCBU is 28 percentage points. This differential reflects the technical barriers to entry in HBM Manufacturing and the consequent pricing power available to the three companies capable of producing it.

The Technology Roadmap

Micron's FY2025 10-K states that the company delivered samples of HBM4 36GB 12-high to multiple key customers to power next-generation AI platforms, with volume production of HBM4 targeted for calendar 2026. HBM4 represents a step-change in both bandwidth and energy efficiency relative to HBM3E — properties that matter enormously for the large-scale AI clusters where power density and thermal management are binding constraints. The development of HBM advanced packaging capabilities in the United States — to which Micron has committed as part of its domestic manufacturing programme — indicates that the HBM supply chain is itself being domesticated as a matter of industrial policy.

The Legal Signal

Netlist, Inc. filed a patent infringement complaint specifically targeting Micron's HBM products in the Eastern District of Texas in May 2025. YMTC's October 2025 omnibus complaint against Micron across multiple jurisdictions also covers certain DRAM products. Patent assertion against a specific product category is the market's most honest signal of commercial value — entities do not litigate expensive multi-Jurisdiction patent cases against products with marginal economic significance. The fact that HBM has attracted dedicated infringement claims validates the product category's financial materiality from an entirely independent direction.

Disclaimer: This article is for informational and educational purposes only and does not constitute financial, Investment, or any other form of professional advice. All data and figures are sourced exclusively from Micron Technology Inc.'s (NASDAQ: MU) Form 10-Q for the quarter ended February 26, 2026 and Form 10-K for the fiscal year ended August 28, 2025, as filed with the US Securities and Exchange Commission.