Samsung Electronics (005930) · SK Hynix (000660)
The Battle for HBM4 Dominance: Samsung and SK Hynix Lead the AI Charge
As the global artificial intelligence (AI) race intensifies, South Korea’s semiconductor giants are positioning themselves at the forefront of the next generation of memory technology. Samsung Electronics (005930) and SK Hynix (000660) are currently locked in a high-stakes competition to secure supply contracts for NVIDIA HBM4 supply, the sixth generation of High Bandwidth Memory (HBM) that will power tomorrow’s most advanced AI accelerators.
Recent industry reports indicate that both companies have accelerated their production timelines, with mass production of HBM4 expected to begin as early as the first half of 2026. This shift comes as NVIDIA prepares its next-generation “VeraRubin” architecture, which will require unprecedented memory bandwidth and energy efficiency. For investors monitoring kstocks.net, the outcome of this NVIDIA HBM4 supply battle will likely define the trajectory of the KOSPI index for the coming year.
SK Hynix: The Incumbent Advantage in NVIDIA HBM4 Supply
SK Hynix has long enjoyed a “first-mover” advantage in the HBM market, serving as the primary supplier for NVIDIA’s H100 and B200 series. To maintain its lead in the NVIDIA HBM4 supply chain, SK Hynix is leveraging its advanced “Advanced Mass Reflow Molded Underfill” (MR-MUF) technology. This proprietary process allows for better heat dissipation and higher stacking density, crucial for the 12-layer and 16-layer configurations required by HBM4.
Market analysts suggest that SK Hynix’s deep integration with NVIDIA’s design team gives it a significant edge in validation. However, the transition to HBM4 introduces a major structural change: the integration of the “logic die” (the base layer of the HBM stack) using foundry processes. SK Hynix’s partnership with TSMC for this logic die is a key pillar of its strategy to dominate the 2026 AI memory market.
Samsung Electronics: The Aggressive Challenger for NVIDIA HBM4 Supply
Samsung Electronics, while trailing in the initial HBM3E cycle, is betting big on a “turnkey” solution to win back NVIDIA HBM4 supply share. Unlike its rivals, Samsung possesses both memory manufacturing and advanced foundry capabilities. By producing both the DRAM layers and the logic die in-house, Samsung aims to offer better cost efficiency and supply chain stability.
The company recently announced a breakthrough in custom HBM solutions, allowing customers to customize the logic die to their specific AI workloads. This flexibility is expected to be a major selling point for “big tech” companies like NVIDIA and Amazon, who are increasingly looking for specialized hardware to optimize their AI models. If Samsung successfully clears NVIDIA’s final quality tests for HBM4 this month, it could trigger a massive re-rating of its stock price.
Market Impact and Future Outlook
The concentration of the global AI supply chain in South Korea has made the KOSPI highly sensitive to semiconductor news. As of March 2026, memory chips account for nearly 25% of South Korea’s total exports. The fierce competition for NVIDIA HBM4 supply ensures that both Samsung and SK Hynix will continue to invest record amounts in Capital Expenditure (CAPEX), further solidifying Korea’s role as the “AI memory hub” of the world.
For investors, the key milestones to watch are the official qualification announcements and the first-quarter earnings calls, where both companies are expected to provide detailed guidance on their 2026 HBM4 capacity expansion. While risks remain—including potential oversupply in the legacy DRAM market—the secular growth of AI demand continues to provide a strong tailwind for the Korean tech sector.
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