South Korean Stock Market Hits 3-Month Low as AI Sell-Off 2026

The South Korean stock market has tumbled to a three-month low as the AI sell-off intensifies, with chip giants SK Hynix and Samsung Electronics leading the decline. Investors are increasingly worried about excessive borrowing by AI companies and rising competition from China, causing global tech shares to wobble.

Why South Korean Stocks Are Falling

South Korea's Kospi index dropped 11.5% from its recent peak, hitting its lowest point since mid-April. The primary driver is the sharp sell-off in semiconductor stocks, as SK Hynix and Samsung Electronics each fell more than 10%. These companies are heavily exposed to the AI memory chip market, which has been a key growth driver but is now facing valuation concerns.

Investors are also reacting to a report that China has begun mass production of domestic deep ultraviolet (DUV) chip-making tools. This development threatens the competitive moat of global chip leaders and adds to fears of oversupply and margin compression.

Global AI Sell-Off Spreads

The sell-off is not confined to Asia. US chip stocks like Intel, AMD, Sandisk, Western Digital, and Seagate all fell more than 4% at Tuesday's open. The Nasdaq 100 briefly entered correction territory, dropping more than 10% from its June record high before recovering to close flat.

Apple was a rare bright spot, briefly becoming the second company ever to surpass a $5 trillion valuation as investors sought a safe haven outside AI-exposed names.

Key Factors Behind the Market Turmoil

• AI debt concerns: Massive borrowing by AI companies to fund datacentre expansion is raising red flags about sustainability.
• Chinese competition: Progress in domestic chip-making equipment threatens global leaders.
• Circular funding risks: The AI industry's reliance on inter-company investments is making investors jittery.
• Valuation correction: After a strong rally, tech stocks are repricing to reflect higher risks.

Comparison: South Korea vs. US Tech Sell-Off

What Analysts Say

Morningstar equity analyst Jing Jie Yu noted that the market was “spooked by the progress of China’s chip-making equipment capabilities,” but called the sell-off “largely a kneejerk reaction and overdone.” Meanwhile, the surge of Chinese memory chip maker CXMT on its Shanghai debut, up 466%, underscores China's aggressive push to build its own AI supply chain.

For investors, the key takeaway is that AI-driven growth remains powerful, but volatility is likely to persist as the market digests new competitive threats and financing risks.

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