South Korea’s KOSPI index plunged 13% today, triggering a trading halt as investors cooled on AI-related semiconductor stocks. The sharp decline in tech leaders like Samsung Electronics and SK Hynix has hit market sentiment, driven by concerns over the actual profitability of global AI infrastructure spending.
South Korea’s benchmark KOSPI index suffered a massive 12.6% decline on Wednesday, forcing authorities to temporarily pause trading. This sharp drop marks a significant turning point for the market, which had previously seen heavy inflows into companies tied to the global artificial intelligence boom. The index has now fallen more than 40% from its recent peak, erasing significant wealth in a very short span of time.
Tech Leaders Lead the Decline
The market downturn has been concentrated in the semiconductor sector, which holds a massive influence over the KOSPI. Samsung Electronics and SK Hynix, two of the largest companies in the index, faced heavy selling pressure. SK Hynix shares fell by approximately 16%, while Samsung Electronics saw a decline of nearly 10%. Together, these two technology firms account for more than half of the total market capitalization of the KOSPI, meaning their performance directly dictates the direction of the broader index.
Why Investors Are Pulling Back
For months, market sentiment was driven by the expectation that heavy spending on AI chips and memory products would lead to massive, long-term earnings growth. While SK Hynix reported a six-fold increase in its latest quarterly earnings, the market had priced in even higher growth. When the reported figures fell short of these elevated expectations, investor confidence rapidly turned toward caution. Many are now questioning if the hundreds of billions of dollars poured into AI infrastructure will actually generate strong, near-term profits.
Leverage and Market Volatility
The intensity of the selloff has been worsened by the use of borrowed money. Many retail investors had taken on significant debt to increase their exposure to these high-growth technology stocks. As share prices began to slide, brokers triggered forced sales to cover these positions. This cycle of liquidation accelerated the downward movement of the index. In the broader region, the trend was mirrored in Taiwan, where semiconductor giant TSMC also saw its stock price drop by about 3%.
Looking ahead, the next important development for market participants is the potential intervention by the South Korean government. Finance Minister Koo Yun-cheol has stated that the administration is reviewing market stabilization measures. This could include changes to regulations governing leveraged ETFs, which allow traders to amplify their market exposure. Investors will be watching for any official announcements regarding these measures, as well as whether semiconductor demand shows signs of stabilizing in the coming quarters.