HBM4 Market Dynamics Shift Towards Korean Giants
The high-bandwidth memory (HBM) market is undergoing a significant transformation as the latest generation, HBM4, begins to see production and validation phases unfold. Recent reports indicate that Samsung and SK hynix, two South Korean memory manufacturers, are poised to dominate this segment, while American company Micron appears to be losing ground. This shift is largely attributed to challenges Micron faces with its HBM4 technology, allowing Samsung and SK hynix to capture a larger share of the market.
Technical Challenges Impacting Micron’s Position
Micron’s difficulties stem from issues with its internally designed HBM4 base die, which is critical for integrating logic and memory in a single package. Unlike Samsung, which benefits from its own logic foundry, and SK hynix, which partners with advanced foundries like TSMC, Micron has opted for a more self-reliant but riskier approach. This has resulted in problems with customer validation, pin speeds, and thermal management due to reluctance in adopting advanced nodes for the base die. These technical hurdles have delayed Micron’s ability to meet the stringent requirements for HBM4, particularly in Nvidia’s Vera Rubin lineup.
Market Share Predictions and Industry Impact
According to analysis shared by Wall St Engine on Twitter, Nvidia is expected to source its HBM4 supply predominantly from SK hynix and Samsung, with a projected split of approximately 70% to SK hynix and 30% to Samsung. This forecast effectively reduces Micron’s share of Nvidia’s HBM4 supply to zero for the time being. SK hynix is anticipated to secure over half of the market share in this generation, while Samsung has already achieved the necessary pin speeds ahead of competitors. Despite these setbacks in the HBM segment, Micron continues to perform strongly in the broader DRAM market, particularly with its general-purpose DRAM products and the growing adoption of SOCAMM technology.
Context and Future Outlook
Micron is reportedly targeting the second quarter of 2026 for Nvidia qualification tests after redesigning its base die and making adjustments to power delivery and physical layer components. However, with Nvidia’s Vera Rubin HBM4 already in full production using Samsung and SK hynix modules, the Korean manufacturers currently hold a competitive edge. Samsung’s return to mainstream HBM markets is notable, especially following delays with its HBM3 products. The evolving landscape suggests that while Micron may re-enter the HBM4 market later, Samsung and SK hynix will be the primary beneficiaries of this generation’s momentum.
As the HBM4 market matures, it will be interesting to monitor how Micron addresses its technical challenges and whether it can reclaim a share of this high-performance memory segment. Meanwhile, Samsung and SK hynix are well positioned to capitalise on the growing demand for advanced memory solutions in high-end computing applications.