Key Highlights
- Samsung and SK Hynix secured exclusive rights to supply HBM4 memory for Nvidia’s Vera Rubin AI accelerator
- Micron’s exclusion from the Vera Rubin flagship supply chain triggered a 6.74% decline in MU stock
- Samsung successfully cleared Nvidia’s HBM4 quality benchmarks at 10 Gbps and 11 Gbps speeds; SK Hynix continues testing at 11 Gbps
- By 2026, SK Hynix is projected to command over 50% of Nvidia’s HBM supply, while Samsung captures 28%
- Mass production is slated to commence in March, with Vera Rubin’s commercial debut scheduled for late 2026
In a significant supply chain decision, Nvidia has designated Samsung and SK Hynix as the sole providers of sixth-generation high-bandwidth memory (HBM4) for its forthcoming Vera Rubin AI processing platform, as reported by the Korea Economic Daily. This strategic selection notably excludes Micron from participating in the flagship chip’s memory supply chain.
The announcement triggered substantial market reactions, with Micron stock plummeting 6.74% during trading. Samsung’s shares on the Korean exchange declined 7.81%, while SK Hynix experienced a 9.52% drop. Even Nvidia saw its stock decrease by 3.01%.
Vera Rubin represents Nvidia’s upcoming flagship AI infrastructure, positioned as the successor to the Blackwell architecture. The complete NVL72 rack system integrates 72 Rubin GPUs alongside 36 Vera CPUs, achieving a 10-fold improvement in performance-per-watt compared to Blackwell systems.
Micron hasn’t been completely excluded from Nvidia’s roadmap. The company will provide HBM4 components for the Rubin CPX, a mid-range accelerator optimized for inference workloads within the Rubin product family. However, its absence from the premium Vera Rubin offering represents a significant setback.
Samsung earned its supplier status after successfully meeting Nvidia’s rigorous quality standards at both 10 Gbps and 11 Gbps performance levels. SK Hynix continues validation testing for the 11 Gbps specification but maintains its position as the largest HBM supplier globally.
Market Share Dynamics Between SK Hynix and Samsung
SK Hynix is anticipated to control approximately 50% of worldwide HBM production capacity in 2026, representing a modest decline from its 59% market share in 2025. Meanwhile, Samsung is positioned to expand its market presence to 28%, up from the previous year’s 20%.
Analysts predict SK Hynix will furnish more than half of Nvidia’s complete HBM requirements — encompassing both HBM3E and HBM4 variants — throughout 2026, with leadership in Vera Rubin HBM4 shipment volumes.
Both semiconductor manufacturers are preparing to initiate HBM4 production this month. The Vera Rubin platform remains on schedule for its second-half 2026 market introduction.
Vera Rubin’s Technical Capabilities and Target Market
The Vera Rubin architecture is engineered for enterprise-scale AI training and inference operations, particularly supporting mixture-of-experts (MoE) architectures that are increasingly prevalent in cutting-edge AI research.
Reported potential purchasers include Microsoft, Amazon, Oracle, and Google. These hyperscale cloud providers have consistently represented Nvidia’s largest customer segment in recent years.
While the Vera Rubin NVL72 configuration consumes twice the electrical power of Blackwell systems, it delivers significantly superior computational efficiency per watt—a critical consideration for data center operations managing these systems at massive scale.
HBM4 technology provides enhanced memory bandwidth compared to earlier generations, addressing one of the primary performance constraints in training and operating large-scale AI models.
Wall Street analysts maintain an optimistic outlook on Nvidia. TipRanks data shows NVDA holds a Strong Buy consensus from 39 analysts, with a single Hold rating. The consensus price target of $272.16 suggests approximately 53% potential upside from present trading levels.
During the trailing twelve-month period, Nvidia stock has appreciated 66.2%, despite Monday’s session pullback following the supplier announcement.
Samsung and SK Hynix are scheduled to commence HBM4 manufacturing in March 2026, with Vera Rubin systems expected to reach customers in the latter half of that year.
