SK Hynix shares surged to a record high on Monday, climbing 12.52% to close at 1,447,000 won ($985.29), as foreign investors piled in following stronger-than-expected signals from major U.S. tech companies that their massive artificial intelligence infrastructure buildout remains firmly on track.
The South Korean memory chipmaker significantly outperformed its larger rival Samsung Electronics, which rose a more modest 5.44% amid concerns over a potential strike by unionized workers demanding a greater share of the company’s booming AI-related profits.
The broader market rose 5.1%. The sharp rally underscores SK Hynix’s emergence as one of the clearest winners in the ongoing AI boom. The company has aggressively positioned itself in high-bandwidth memory (HBM) chips, the specialized, high-performance memory essential for training and running advanced AI models, giving it a strong edge as demand continues to outstrip supply.
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Sustained Boom Expected
Support for a more prolonged upcycle came from Bank of Korea senior deputy governor Ryoo Sang-dai, who suggested the current semiconductor boom could last longer than previous cycles. His remarks echoed the optimistic tone struck by both SK Hynix and Samsung Electronics during their earnings conference calls last month.
Last week’s earnings from the four major U.S. tech giants, Alphabet, Microsoft, Meta, and Amazon, reinforced investor confidence. All four companies signaled that AI-related capital spending would not slow, with combined outlays now expected to surpass $700 billion this year, up from around $600 billion previously.
Microsoft and Meta both raised their capital expenditure forecasts, citing higher-than-expected memory chip prices as a major factor. Amazon was particularly blunt about the supply-demand imbalance during its earnings call.
“I think everybody knows that the cost of these components, particularly memory, has skyrocketed. We are just in a stage where there’s just not enough capacity for the amount of demand,” Amazon said.
The comments highlight a critical dynamic: even as memory prices remain elevated, the world’s biggest cloud and AI players are committed to accelerating their data center investments, creating a powerful tailwind for specialized memory producers like SK Hynix.
SK Hynix has benefited from its early and heavy focus on HBM technology, securing key supply agreements with leading AI chip designers, most notably Nvidia. While Samsung has also expanded in the space, SK Hynix has captured significant market share in the most advanced HBM products required for next-generation AI accelerators.
The contrast with Samsung was evident on Monday. While both companies are major memory players, Samsung’s shares lagged due to labor tensions. Unionized workers are pushing for larger bonuses tied to the company’s strong AI-driven performance, raising the risk of production disruptions.
Analysts say SK Hynix’s more focused bet on high-margin AI memory, combined with strong execution, has made it the preferred play for investors seeking direct exposure to the AI infrastructure buildout.
The broader context is one of sustained tightness in the memory market. Surging demand from AI data centers has strained global supply chains, pushing prices higher and encouraging hyperscalers to commit even more capital. This environment favors companies like SK Hynix that have invested early and secured design wins in the most cutting-edge segments.
With Big Tech showing no signs of pulling back, despite rising costs, many in the industry now expect the current cycle to be longer and more structurally driven than past semiconductor booms, which were often tied to shorter consumer electronics cycles.
Monday’s record close reflects growing conviction among global investors that SK Hynix is exceptionally well-placed to benefit from this multi-year shift. While the chip sector is notoriously cyclical, the combination of insatiable AI demand and persistent capacity constraints has created one of the most favorable setups for leading memory specialists in years.
Foreign buying was a key driver of the session’s momentum, highlighting SK Hynix’s appeal to international investors hunting for high-conviction AI plays in the Asian supply chain. As long as U.S. tech giants continue raising their spending plans and memory supply remains tight, SK Hynix appears set to remain a standout performer.