Overnight Losses in U.S. Chipmakers Spill into Seoul, Driving Major Selloff at SK Hynix 

American tech companies tumbled during overnight trading, sparking a major chip stock selloff that hit Asian exchanges immediately as they opened for business. South Korea’s memory chip giant, SK Hynix, faced a staggering decline that sent shockwaves across the region and directly pressured equity futures in both Europe and the United States. The sharp drop spooked markets throughout Asia, triggering broad weakness across technology stocks. Shares of rival manufacturer Samsung Electronics fell more than 7 percent, while Japanese testing equipment maker Advantest slid over 6 percent, SoftBank Group tumbled 7 percent, and Tokyo Electron lost more than 5 percent.  

The massive market downturn severely impacted South Korea’s benchmark Kospi index, which crashed 9 percent and triggered a mandatory 20-minute trading halt. SK Hynix and Samsung Electronics together represent over 60 percent of the Kospi’s total market capitalization, making the entire index highly sensitive to any shift in semiconductor performance. Even though South Korean President Lee Jae Myung announced that his administration would channel government support into massive artificial intelligence data centers, physical AI, and chip initiatives, local stocks extended their steep losses after trading resumed.   

The severe volatility underscores growing investor anxiety regarding high valuations and the exact pace of AI infrastructure spending. SK Hynix recently completed a massive U.S. listing that allowed global traders to swap shares, but the event also amplified price swings as fund managers quickly adjusted their positions. Financial experts suggest that the current pullback reflects incredibly crowded semiconductor trades following a long, AI-driven market rally. Analysts note that while the broader memory upcycle tracked stronger than expected, investors are engaging in heavy profit-taking and portfolio rebalancing due to mounting uncertainty over whether massive infrastructure investments can generate swift commercial returns.