Global markets wobble as AI stocks tumble on fears of over‑spending

A sharp sell‑off in artificial‑intelligence stocks has rippled through global markets, dragging down major indexes in the United States, Europe and Asia on October 22. Shares of companies tied to AI infrastructure, chips and cloud platforms fell particularly hard as investors questioned whether spending on data centers and advanced semiconductors has run too far ahead of realistic profit expectations.

According to reports, some leading U.S. AI names lost close to 10% in a single session, helping to erase an estimated $130 billion from the combined net worth of the world’s six richest individuals. Firms that benefit directly from the boom in GPUs and generative‑AI cloud services have been market darlings for several years, and many analysts argue their underlying businesses remain strong. But valuations had priced in extremely aggressive growth, leaving the sector vulnerable to any shift in sentiment or macroeconomic worries.

For now, most large technology companies are sticking with ambitious AI investment plans, and long‑term demand for compute and models is still expected to rise. The correction instead highlights mounting unease about an “AI bubble” and the possibility of more volatility ahead. Investors, including those in Japan who gain exposure through global tech and semiconductor ETFs, may need to reassess how concentrated their portfolios are in the AI trade.