HBM4 memory supply crunch

All three volume HBM producers began mass shipments of HBM4 in the first half of 2026, but Micron disclosed over $1 billion in HBM4 revenue in fiscal Q3 2026 alone, with its 12-high stack ramp tracking twice as fast as the prior-generation HBM3E 12-high.

The supply constraint through mid-2026 is not raw wafer capacity. Silicon Analysts identifies 12-layer stacking yield issues and logic base-die integration complexity as the binding bottleneck, a multi-quarter problem that capacity expansions alone cannot close. Memory suppliers are operating at record margins: Micron at 80.4%, SK hynix at 76.3%, and Samsung Device Solutions at 70.0%, a Memory Margin Premium of 10.0 percentage points over NVIDIA's 65.6% and 15.2 points over TSMC's 60.3%.

HBM4 has demonstrated its differentiated technological edge by achieving customer-required operating speeds while delivering industry-leading power efficiency and cost competitiveness. The company began mass shipments of HBM4 in the second quarter and will ramp up production in the second half of the year.SK hynix corporate statement, Q2 2026 Financial Results, July 29, 2026

Long-term agreements now dominate allocation. Micron has signed 16 strategic customer agreements, typically five-year terms with $100 billion in cumulative minimum-price revenue and $18 billion in cash deposits, while Samsung has allocated roughly 60 to 70% of capacity to multi-year contracts. The result: HBM4 supply through mid-2026 is constrained by qualified, shippable product, not by the number of fabs or tools (why HBM supply still won't catch up).

All three major HBM suppliers shipped HBM4 in volume during the first half of 2026, but only Micron disclosed a quantified revenue figure: more than $1 billion, according to Axis Intelligence. The financial results reveal the mechanism behind the supply crunch: Micron Technology reported an operating margin of 80.4 percent in fiscal Q3 2026, SK hynix reported 76.3 percent in Q2 2026, and Samsung Electronics Device Solutions division reported 70.0 percent in Q2 2026, representing a Memory Margin Premium of +10.0 percentage points over NVIDIA's 65.6 percent and +15.2 points over TSMC's 60.3 percent, per Axis Intelligence. Samsung's HBM4 delivers 11.7 Gbps pin speed consistently, up to 13 Gbps capable, 46 percent above the 8 Gbps industry standard and a 1.22× improvement over HBM3E's 9.6 Gbps, Samsung announced. The margin premium persists because no alternative memory architecture can match HBM4's bandwidth density, leaving AI accelerator designers with no negotiating leverage.