KOSPI Plunges 7% as Global Chip Sell-Off Deepens Amid AI Debt Fears

Key points

• South Korea's KOSPI index fell 7% on October 14, 2026, marking a deepening of the global chip sell-off.
• SK Hynix and Samsung Electronics, which account for over half of South Korea's stock market capitalization, dropped 10% and 8%, respectively.
• US chip stocks, including Nvidia, Broadcom, AMD, and Intel, led the decline on Wall Street amid worries about rate hikes and AI debt financing.
• CoreWeave's stock fell over 15% after concerns about its debt-heavy balance sheet and interest expense were highlighted on social media.
• Investors are awaiting TSMC's quarterly earnings, with expectations of a 60% rise in profits, to assess the health of the AI buildout.

Background

This sell-off follows a significant decline in South Korean equities in the second half of 2026, with the KOSPI index dropping 24% and reversing its status as the world's top-performing market. The decline has been driven by a massive sell-off in technology stocks, particularly memory-chip giants, amid global inflation concerns and a rotation of capital toward broader AI supply chains in Taiwan.

How outlets are covering it

Yahoo Finance emphasizes the impact of AI-driven debt financing and rate hike fears on the chip sector, highlighting CoreWeave's sharp decline. AP News focuses on the broader Asian stock plunge, noting the severe sell-off in South Korea and Japan. Both sources agree on the severity of the decline in memory chip stocks and the role of Chinese competition, but Yahoo Finance places more emphasis on the AI infrastructure debt concerns, while AP News highlights the broader market impact.

Why it matters

The sell-off in chip stocks reflects broader concerns about the sustainability of AI-driven infrastructure spending and the potential impact of rising interest rates on debt-heavy companies. The decline in South Korean markets, which are heavily weighted toward chipmakers, signals a shift in investor sentiment and could have ripple effects across global tech markets. The upcoming TSMC earnings will be a key indicator of the health of the AI buildout and could influence market sentiment in the near term.

What to watch

Investors will closely watch TSMC's quarterly earnings on October 15, 2026, to gauge the sustainability of AI demand. The results will be particularly important for assessing the foundry's capacity, given ASML's warning that it may not be able to fully meet demand in 2027 and 2028. Any slowdown in AI spending could spell trouble for chip makers, which have been the main beneficiaries of infrastructure spending as hyperscalers race to build out data centers.