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Seoul, July 14, 2026 – South Korea’s stock market was jolted on July 13 as SK Hynix shares tumbled 15.4 percent, their steepest single-day decline on record, just days after the chipmaker’s much hyped trading debut in the United States.
The sell off rippled across the Kospi index, which fell 9 percent and triggered a rare circuit breaker, underscoring the volatility gripping global markets amid the artificial intelligence boom.
The sharp reversal came after SK Hynix’s American Depositary Receipts surged 13 percent on July 10, following its $26.5 billion listing the second-largest share sale in history.
Investors had piled into the stock, betting on the company’s dominance in high-bandwidth memory chips crucial for powering Nvidia’s AI processors.
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Yet by Monday, profit taking and concerns over stretched valuations sent shares spiraling, dragging Samsung Electronics down 10.7 percent and amplifying the broader market rout.
Analysts described the plunge as a “sell the news” reaction rather than a fundamental shift in SK Hynix’s outlook.
Petra Capital noted that much of the optimism surrounding the ADR debut had already been priced in.
Despite the correction, SK Hynix shares remain up more than 500 percent year on year, a testament to the extraordinary demand for AI-related semiconductors.
The company’s long-term prospects remain tied to the AI supercycle.
Chief Executive Kwak Noh jung recently warned that shortages in advanced memory could persist beyond 2030, reinforcing expectations of sustained demand.
SK Hynix’s high bandwidth memory has become indispensable for training large-scale AI models, though its rigid contract structure has slowed revenue growth compared to conventional chips.
Analysts caution that aggressive capacity expansion across the industry could eventually lead to oversupply, raising the specter of a boom-bust cycle.
Volatility has become a defining feature of Seoul’s equity markets in 2026.
Retail investors, emboldened by leveraged exchange traded funds tracking SK Hynix and Samsung, have fueled daily swings of five percent or more.
The Kospi’s seventh circuit breaker this year highlights the fragile stability of a market increasingly driven by speculative momentum rather than fundamentals.
Looking ahead, Korea Investment & Securities projects SK Hynix’s operating profit may miss consensus estimates by eight percent this quarter, citing contract revenue.
Yet MRM Research argues the stock is now “deeply oversold,” suggesting a rebound opportunity for long term investors.
Global funds remain divided some see the current turbulence as a healthy correction within an AI driven supercycle, while others warn of a classic speculative bubble.
For now, SK Hynix’s record plunge serves as a reminder of the risks embedded in the AI chip frenzy.
While the company’s technological edge positions it at the heart of the next computing revolution, the path forward will likely be marked by sharp swings, testing the resilience of both investors and markets.
