Sixteen months ago, SK Hynix was valued at under $100 billion — a company firmly in the shadow of its South Korean rival Samsung and the global semiconductor giant TSMC. Today, it sits at approximately $948 billion, closing in on the $1 trillion threshold at a pace that has left even bullish analysts revising their targets upward. The fuel behind one of the most extraordinary valuation runs in modern corporate history is a single, specialised product: High Bandwidth Memory (HBM) — the chip that sits alongside AI processors and keeps them fed with data fast enough to matter. If NVIDIA's GPUs are the brains of the AI economy, SK Hynix's HBM is its circulatory system.
What Is HBM and Why Does the AI Economy Depend on It?
High Bandwidth Memory is a specialised form of DRAM designed to move data between processors and memory at extreme speeds — the critical bottleneck in AI training and inference workloads. Modern large language models and AI inference pipelines require continuous, rapid access to enormous datasets; standard DRAM simply cannot move data fast enough to keep AI accelerators running at full capacity. HBM solves that problem by stacking multiple DRAM dies vertically and connecting them directly to the GPU or AI processor through a wide parallel interface.
Without HBM, even the world's most powerful AI GPUs would be routinely starved of data — limiting both training speed and inference performance in ways that cannot be resolved by adding more compute. As AI models grow larger and more complex, the demand for faster, more capable HBM grows with them. SK Hynix recognised this dynamic early and invested aggressively in HBM manufacturing years before the AI boom fully materialised. That timing advantage has become one of the most valuable moats in the global semiconductor industry.
Record Financials: $35.5B Revenue and a 72% Operating Margin
The financial results underpinning SK Hynix's valuation surge are extraordinary in scale. Q1 2026 revenue reached a record $35.5 billion — nearly tripling from the same period the prior year and surpassing 50 trillion Korean won in quarterly revenue for the first time in the company's history. Operating profit rose fivefold year-on-year and nearly doubled from the prior quarter, while the operating margin hit an all-time high of 72% — a figure that reflects both extraordinary pricing power and the structural scarcity of advanced HBM manufacturing capacity.
The stock performance has been equally dramatic. After surging 274% across all of 2025, shares climbed a further 200% year-to-date in 2026 — more than 850% in total over the past twelve months. From under $100 billion to within touching distance of $1 trillion in sixteen months is a run that has no direct precedent in the history of industrial semiconductor companies. Analysts have raised price targets sharply: one broker lifted their target by 47% to 2,500,000 Korean won per share — the equivalent of approximately $1,710.
The NVIDIA Relationship: ~90% of HBM Output Goes to One Customer
The most consequential single relationship in SK Hynix's commercial model is its position as the dominant HBM supplier to NVIDIA. Approximately 90% of SK Hynix's HBM output goes directly to NVIDIA — whose AI accelerators, including the H100, H200, and upcoming Blackwell and Vera Rubin architectures, require large quantities of the highest-generation HBM available to function at peak performance.
This near-monopoly supplier position within NVIDIA's supply chain is the single most important factor in SK Hynix's valuation trajectory. As NVIDIA has grown from a gaming GPU company into the most valuable semiconductor business in history — on the back of AI infrastructure demand — its primary memory supplier has grown with it. The asymmetry of SK Hynix's laser focus on memory, compared to Samsung's sprawling consumer electronics empire, has made it the preferred infrastructure partner for the AI buildout: less distracted, more specialised, and more deeply embedded.
SK Hynix has also confirmed it plans to begin supplying samples of its seventh-generation HBM4E chips in the second half of 2026, with mass production targeted for 2027. HBM4E is expected to be the primary AI memory chip for NVIDIA's next-generation Vera Rubin architecture — meaning SK Hynix's most important customer relationship is set to deepen further.
South Korea's Trillion-Dollar Moment — and Its Valuation Opportunity
Samsung Electronics crossed the $1 trillion market capitalisation threshold in early May 2026 — making South Korea the first country outside the United States to host a trillion-dollar company. If SK Hynix crosses the same milestone, South Korea will become the only nation on earth — other than the US — with two trillion-dollar corporations simultaneously.
The ripple effects on South Korean capital markets have been substantial. The benchmark KOSPI index surged more than 86% year-to-date in 2026 after climbing 75% in 2025 — its strongest multi-year performance since 1999 — driven largely by foreign institutional capital seeking semiconductor exposure at valuations that remain arguably more attractive than comparable US names. SK Hynix trades at approximately 6x forward earnings, compared with around 10x for rival Micron Technology — a valuation gap that fund managers at major investment conferences have highlighted as a compelling entry point even after the stock's extraordinary run.