South Korean equities crash as AI chip rally collapses amid global inflation fears

Key points

• The Kospi index fell 3.65% on Monday, closing at 6,384.24, marking its fourth consecutive losing session.
• Foreign investors sold a net 2.02 trillion won of Korean stocks, while domestic individuals bought 1.47 trillion won.
• Samsung Electronics shares dropped 4.39% and SK Hynix fell 4.52%, despite Samsung forecasting a ninefold increase in quarterly operating profit.
• Trading turnover has dropped 70% from its late-May peak, indicating a sharp cooling of market activity.
• The Korean won strengthened against the U.S. dollar, rising to 1,335.1 per dollar from 1,342.8 the previous day.

Background

South Korea's stock market was the world's best-performing major benchmark in the first half of 2026, driven by a massive AI boom that boosted memory-chip profits. However, the market experienced extreme volatility in July, plunging 22% before rebounding 18% on the final trading day, triggering multiple circuit breakers. Regulators subsequently tightened rules on leveraged single-stock ETFs to curb speculation. The recent decline follows a period of extraordinary gains, with the Kospi still up over 50% for the year despite the recent pullback.

How outlets are covering it

Business Insider emphasizes a structural shift in the AI trade, noting that investors are moving away from South Korea's memory-chip giants toward broader AI hardware supply chains in Taiwan, where the Taiex index has climbed 7% in the second half. Yahoo Finance highlights the immediate flight of foreign investors and the loss of momentum in the AI boom. UPI focuses on external macroeconomic pressures, citing inflation concerns, rising oil prices due to Middle East tensions, and rebalancing of semiconductor-focused ETFs as key drivers of the sell-off. Analysts at Hana Securities also point to concerns that Samsung and SK Hynix may have completed their treasury stock purchases, reducing future support for their share prices.

Why it matters

The collapse of South Korea's stock market signals a potential shift in the global AI investment landscape, moving from memory-chip dominance to broader semiconductor supply chains. The flight of foreign capital and sharp drop in trading volume indicate a loss of confidence in the region's tech-heavy market. This could have ripple effects on global AI infrastructure investments and may force South Korean regulators to further intervene to stabilize the market and protect domestic investors.

What to watch

Investors will watch for further signs of capital rotation from South Korea to Taiwan and other AI hardware markets. Regulators may implement additional measures to stabilize the market and curb speculation. The performance of Samsung and SK Hynix will be critical in determining whether the sell-off continues or if the market finds a floor. Global inflation and oil prices will also be monitored for their impact on tech stocks and broader market sentiment.