KOSPI Circuit Breaker Triggered: Semiconductor Sell-off and Market Outlook

Convergence of Global Risks: KOSPI Plunges 8% with Circuit Breaker Triggered

On July 28, 2026, the South Korean stock market faced a severe shock. Following a sell-sidecar triggered shortly after the opening bell, the KOSPI index plummeted by over 8%, leading to a Level 1 Circuit Breaker at 10:13 AM. This halted all trading for 20 minutes, marking the eighth such occurrence this year.

The primary catalyst for this crash is the domino-effect sell-off in the global semiconductor sector. Overnight, major tech stocks in the US, led by NVIDIA and ASML, suffered sharp declines, severely dampening investor sentiment. Furthermore, news of China initiating the independent development of Deep Ultraviolet (DUV) lithography equipment intensified concerns over escalating global semiconductor technology competition, adding fuel to the massive sell-off.

Foreigners Net Sell Over 2 Trillion Won, Semiconductor Giants Plunge

South Korea's large-cap semiconductor stocks, which dictate the market's direction, took a direct hit. Both Samsung Electronics and SK Hynix recorded steep declines of around 10% intraday, spearheading the KOSPI's drop. The supply and demand dynamics were particularly polarized.

• Foreign Investors: Recorded a massive net sell-off of over 2 trillion won in the KOSPI market, focusing on profit-taking and risk management.
• Retail Investors: Conversely, retail investors responded with aggressive bargain hunting, net buying nearly 2 trillion won.

This massive exodus by foreign institutional capital is analyzed not as a fundamental collapse, but as a result of extreme deterioration in investor sentiment and mechanical selling triggered by consecutive global bad news. The index exhibited extreme volatility, dropping to near the 6,100-point level at one point.

Market Outlook and Investment Strategy

Securities analysts suggest that the current plunge is likely an excessive correction driven by macroeconomic anxiety and tangled supply-demand dynamics, rather than a deterioration of intrinsic corporate value. However, investors must remain cautious about predicting market direction until the volatility fully subsides.

The market's potential for a turnaround will heavily depend on the upcoming earnings reports from US big tech companies and the direction of global interest rate policies later this week. In the short term, it is crucial to avoid excessive leverage, calmly verify the market's support levels, and prioritize strict risk management.