Japanese and South Korean semiconductor stocks fell sharply on Thursday as the selloff in US technology shares rattled investor confidence across Asian markets. The downbeat sentiment spread quickly through the region's tech-heavy indices, with chipmakers bearing the brunt of selling pressure. Meta Platforms Inc. led the decline in American tech stocks, dragging down the broader market.

The carnage followed Meta's announcement that it would sell access to AI computing power, a move that sparked fresh worries about potential oversupply in the artificial intelligence sector. Investors fear that increasing AI infrastructure availability could saturate demand and pressure pricing for chips and computing services. This concern hit semiconductor companies particularly hard since they supply the processors that power AI workloads.

The episode highlights how interconnected global tech markets have become, with sentiment in Silicon Valley quickly translating into trading action in Tokyo and Seoul. Asian chip stocks often serve as a bellwether for worldwide semiconductor demand, making them especially sensitive to shifts in AI investment outlook. The Meta announcement appears to have triggered a repricing of AI growth expectations.

Chip equipment manufacturers and memory producers saw some of the steepest declines as investors questioned whether the AI boom can maintain its current trajectory. The selloff suggests markets are becoming more discerning about which AI opportunities justify premium valuations. Asian semiconductor shares may remain volatile until investors gain clarity on actual AI demand versus supply capacity.