Bloomberg: South Korea's stock market is emerging as a key bellwether for global AI stock trading.

According to Bloomberg, South Korea’s roughly $4 trillion stock market has become a key window for fund managers in London, New York and Tokyo to gauge global AI risk appetite. Stock fluctuations in Samsung Electronics and SK Hynix continue to ripple through global chip stocks, and some Japanese traders have added the KOSPI index to their daily watchlists. The correlation between South Korea’s market and U.S. tech stocks has grown significantly. Bloomberg data shows the 60-day correlation coefficient between the KOSPI index and the Nasdaq 100 has risen to 0.46, near a two-year high—about three times the 0.16 average over the past five years. Last week, South Korea’s market fell nearly 9% at one point amid renewed doubts about AI demand prospects, with the selloff later spreading to Wall Street; SK Hynix’s American depositary receipts dropped 9.3%. However, high-leverage trading in South Korea has amplified volatility. The KOSPI index has fallen 25% from its June peak, erasing roughly $1 trillion in market capitalization, with both Samsung Electronics and SK Hynix down at least 30%. South Korea recently suspended the launch of new single-stock leverage trading products to curb speculation and market volatility. Even so, the KOSPI index is still up 62% year-to-date, ranking among the top of major global markets. Given Samsung Electronics and SK Hynix’s critical positions in the global memory chip supply, multiple institutional players believe that as long as the AI rally persists, South Korea’s stock market will remain an important barometer for global AI and semiconductor trading.