SK Hynix (000660.KS) announced on Friday that it has completed internal certification of its HBM4 (high-bandwidth memory 4) chips and established a production system, positioning itself to maintain its dominance in the advanced memory market.
Key Developments
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In March 2025, SK Hynix shipped 12-layer HBM4 chip samples to customers.
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The company aims to complete mass production preparations for these chips within H2 2025.
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Shares rose 7% to a record high of 328,500 won ($236.71), outperforming the benchmark KOSPI’s 1.5% gain.
Market Context
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HBM technology: First introduced in 2013, HBM stacks DRAM vertically to save space, cut power use, and process vast data volumes required by AI workloads.
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Market share: SK Hynix is projected to hold about 60% of the HBM market in 2026, down slightly from its current 66%, according to Meritz Securities.
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Customers: Nvidia remains its largest client, though Samsung Electronics and Micron supply smaller volumes.
Rival Strategies
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Samsung Electronics: Plans to use a 1c-nanometer node for HBM4, compared to SK Hynix’s 1b-nanometer process, signaling a push to catch up despite a weaker track record. Samsung already provided HBM4 samples to customers and plans to start supply in 2026.
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Micron: Competing with custom-built logic dies (“base dies”) that make it harder for customers to switch suppliers.
Industry Impact
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SK Hynix’s first-mover advantage in HBM4 is expected to secure early contracts with major AI players like Nvidia.
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Analysts note that customer-specific base dies mark a technological shift that could lock buyers into long-term supplier relationships.
Market Performance YTD
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SK Hynix: +88.9%
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Samsung Electronics: +41.7%
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Micron (Nasdaq): +78.9%
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KOSPI benchmark: +41.5%