Key Takeaways
- Samsung and SK Hynix secured exclusive contracts to provide HBM4 memory chips for Nvidia’s Vera Rubin AI accelerator platform
- Micron was excluded from the flagship Vera Rubin supply arrangement, triggering a 6.74% decline in MU shares
- Samsung successfully completed Nvidia’s quality verification process at both 10 Gbps and 11 Gbps speeds; SK Hynix continues testing at 11 Gbps
- Industry forecasts suggest SK Hynix will control more than 50% of Nvidia’s HBM requirements in 2026, while Samsung captures 28%
- Manufacturing is scheduled to commence in March, with the Vera Rubin platform debuting in late 2026
According to Korea Economic Daily, Nvidia has designated Samsung and SK Hynix as the sole providers of sixth-generation high-bandwidth memory (HBM4) for its next-generation Vera Rubin AI processor. Notably absent from this flagship supply chain is Micron, despite the company’s previous involvement in HBM production for Nvidia.
The announcement triggered significant stock movements, with Micron shares declining 6.74%. Korean-listed Samsung stock fell 7.81%, while SK Hynix dropped 9.52%. Even Nvidia experienced a 3.01% pullback.
Vera Rubin represents Nvidia’s next flagship AI architecture, positioned as the successor to Blackwell. When configured as a complete NVL72 rack system, it combines 72 Rubin GPUs with 36 Vera CPUs and achieves 10x superior performance-per-watt compared to the Blackwell generation.
Micron hasn’t been completely excluded from the Rubin ecosystem. The company will provide HBM4 memory for Rubin CPX, a middle-tier accelerator optimized for inference workloads. However, it won’t participate in supplying the premium Vera Rubin offering.
Samsung received approval after successfully meeting Nvidia’s stringent quality requirements 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 leading HBM supplier globally.
Market Share Dynamics: SK Hynix Maintains Lead While Samsung Expands
Industry projections indicate SK Hynix will control approximately 50% of worldwide HBM production in 2026, representing a modest decrease from its 59% share in 2025. Samsung is anticipated to expand its market presence to 28%, climbing from 20% in the previous year.
SK Hynix is positioned to deliver over half of Nvidia’s combined HBM requirements — encompassing both HBM3E and HBM4 technologies — throughout 2026, and is expected to be the primary volume supplier for Vera Rubin HBM4 chips.
Both manufacturers plan to initiate HBM4 production this month. The Vera Rubin platform remains on schedule for commercial availability in the second half of 2026.
Understanding Vera Rubin’s Target Applications
The Vera Rubin architecture targets enterprise-scale AI training and inference operations, particularly the mixture-of-experts (MoE) model architectures increasingly deployed in cutting-edge AI development.
Reported potential buyers include Microsoft, Amazon, Oracle, and Google. These cloud infrastructure giants have consistently ranked among Nvidia’s largest customers in recent product cycles.
While the Vera Rubin NVL72 configuration consumes twice the power of Blackwell systems, it delivers significantly improved computational efficiency per watt — a critical metric for data center operators managing large-scale deployments.
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 maintains an optimistic outlook on Nvidia. TipRanks data shows NVDA holds a Strong Buy consensus rating based on 39 analysts, with one Hold recommendation. The consensus price target of $272.16 suggests approximately 53% potential upside from current trading levels.
Despite Monday’s decline related to the supplier announcement, Nvidia stock has advanced 66.2% over the trailing twelve months.
Samsung and SK Hynix are positioned to launch HBM4 manufacturing operations in March 2026, with Vera Rubin systems anticipated to reach customers during the second half of the year.
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