Kospi Plunges 7% as Chip Selloff Deepens Amid AI Rotation and Chinese Competition

Key points

• The Kospi index fell 7.4% to 5,914.35, marking its lowest point since late July 2026.
• Samsung Electronics shares dropped 7.7%, while SK Hynix fell 8.8%, leading the decline in the semiconductor sector.
• Investors are rotating capital from Korean memory chipmakers to Taiwan's Taiex index, which has gained 7% in the second half of 2026.
• Reports of advancements by Chinese memory chipmaker CXMT have intensified concerns about competition for global market share.
• Trading turnover in South Korean equities has dropped 70% from its late-May peak, and foreign investors have withdrawn $131 billion from the market in 2026.

Background

South Korea's Kospi was the world's best-performing major stock benchmark in the first half of 2026, driven by the AI boom. However, it has since fallen 24% in the second half, becoming the worst-performing major market. The market's heavy reliance on Samsung and SK Hynix, which account for over half the index, has amplified volatility. Previous concerns included global inflation, rising oil prices due to Middle East tensions, and a crowded trading position in AI stocks.

How outlets are covering it

NBC News emphasizes the immediate sell-off in chip shares and the impact of Chinese competition from CXMT on Samsung and SK Hynix. Business Insider highlights the broader structural shift, noting that investors are moving away from Korean memory chipmakers toward Taiwan's more diversified AI hardware supply chain, which includes advanced manufacturing and packaging. Yahoo Finance provides real-time market data, showing significant declines in semiconductor-related ETFs and individual stocks like Micron and Cerebras Systems.

Why it matters

The sharp decline in South Korea's stock market signals a potential shift in the global AI investment landscape. Investors are increasingly seeking diversified exposure to AI infrastructure beyond memory chips, which could impact the valuation and growth prospects of major semiconductor companies. The rotation of capital also reflects broader concerns about the sustainability of the AI boom and the competitive dynamics in the semiconductor industry.

What to watch

Investors will closely watch upcoming earnings announcements from major firms, including Citigroup, JPMorgan Chase, and Wells Fargo, as well as semiconductor companies like ASML and TSMC. The market will also monitor developments in Chinese competition and any further shifts in capital flows between South Korea and Taiwan.