SK Hynix Quadruples in a Year as AI Demand Outstrips Supply – But Rivals Are Closing In

SK Hynix has become the second South Korean company ever to breach the trillion-dollar market cap threshold, joining arch-rival Samsung Electronics in an exclusive club that now accounts for more than 40% of the KOSPI index. The milestone was reached Friday as shares closed at 2,333,000 KRW after touching an intraday all-time high of 2,379,000 KRW. The stock has more than quadrupled from a low of around 510,000 Won in October 2025, translating to a year-to-date gain of 245%.

The driving force behind this relentless rally is the insatiable appetite for High-Bandwidth Memory (HBM), the specialized chips that power Nvidia’s AI processors. SK Hynix commands a dominant position in the HBM market, and the company’s entire production capacity for the rest of 2026 is already sold out. Pricing power has been extraordinary: HBM prices have doubled year over year, feeding directly into the bottom line. In the first quarter of 2026, SK Hynix posted record revenue of 52.6 trillion Won and operating profit of 37.6 trillion Won – a fivefold increase from the prior year.

Strategically, the company has placed a big bet on the future of AI. This week it joined a $65 billion Series H financing round for Anthropic, the AI developer behind Claude. The round valued Anthropic at $965 billion and included Samsung, Micron, Amazon, and Google as fellow investors. Analysts view the move as a way for SK Hynix to gain early insight into the requirements of next-generation AI models, positioning itself to co-develop the HBM architectures those models will need – and locking in future supply contracts.

Should investors sell immediately? Or is it worth buying SK Hynix?

Yet competition is sharpening on multiple fronts. Samsung has already shipped samples of its 12-layer HBM4E chips to customers, a direct challenge to SK Hynix’s strength in the HBM3 and HBM3E segments. SK Hynix is racing to accelerate its own HBM4E development, with first deliveries expected in the second half of 2026. Meanwhile, Chinese rival ChangXin Memory Technologies has boosted its DRAM market share to 8% in the first quarter, pricing its chips 15–20% below Korean manufacturers. For now, SK Hynix retains a near-monopoly on high-end AI memory, where a global supply deficit is expected to persist through 2028.

The boom has also created domestic ripples. Employees at SK Hynix are receiving special bonuses of around 630 million Won each, and a debate in South Korea has begun over how to redistribute what some call “excess profits” from the AI windfall.

A key catalyst on the horizon is a planned visit by Nvidia CEO Jensen Huang to South Korea in December. Market observers expect the meeting to clarify long-term supply agreements for future GPU architectures, offering a critical test of whether the current supercycle can sustain its momentum. For now, SK Hynix is riding a wave that has already reshaped the Korean equity landscape – but the next chapter will be defined by how well it defends its lead against hungry competitors.

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