South Korea's Kospi Index Drops Over 10% as AI Chip Stocks Sell Off

South Korea's Kospi index fell over 10% to its lowest since April, led by sharp drops in Samsung and SK Hynix.

South Korea's Kospi index shed more than 10% in a single session, its lowest point since April, as investors dumped shares in the country's two dominant chipmakers. Samsung Electronics and SK Hynix each fell by more than 10%, dragging the broader index down with them in one of its sharpest single-day declines in recent memory. The sell-off is rooted in growing investor anxiety about whether the current AI spending boom is sustainable. A key concern fueling the drop is the rise of Chinese AI startups and domestic Chinese chipmakers, which investors fear could erode the competitive advantage — and premium valuations — that global semiconductor companies have enjoyed since AI demand surged. The losses were not confined to South Korea. Tokyo's Nikkei 225 fell 3%, and Taiwan's Taiex dropped 3.8%, reflecting broad pressure across Asia's technology-heavy markets. Oil prices also declined more than 1%, though U.S. futures were little changed at the time of reporting. Samsung and SK Hynix have been at the center of the AI hardware boom, supplying the high-bandwidth memory chips critical to training and running large AI models. Their sharp declines signal that markets are beginning to price in risk that demand growth may slow or that new competition could compress future earnings.

Why it matters

South Korea's chipmakers are central suppliers to the global AI hardware ecosystem, so sharp declines in their valuations signal broader investor doubt about the durability of AI-driven demand. The sell-off also spread across Asian markets, suggesting the concern is regional rather than isolated.

What's next

Investors will be watching whether the sell-off spreads further into U.S. markets and whether AI-related companies provide guidance that addresses concerns about Chinese competition and demand sustainability.

Key facts

• South Korea's Kospi index fell more than 10%, its lowest level since April
• Samsung Electronics and SK Hynix each dropped more than 10% in the session
• Tokyo's Nikkei 225 fell approximately 3% on the same day
• Taiwan's Taiex declined 3.8%, extending the Asia-wide tech sell-off
• Oil prices dropped more than 1%, while U.S. futures were largely unchanged
• A key driver cited is the expected rise of Chinese AI startups and chipmakers as competitive threats

Bias & framing notes

The Associated Press, Atlanta Journal-Constitution, Barchart, and WDIV sources share nearly identical text, suggesting a single wire report was republished across outlets rather than independently verified. The Guardian's framing emphasizes the 'AI sell-off' and Chinese competition angle more explicitly in its headline, while the wire-based reports focus on the raw index move. No source provides a dissenting view or quotes from company officials or analysts, leaving the stated rationale for the decline as investor inference rather than confirmed company guidance.

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