Nasdaq 100 recovers $3 trillion after AI euphoria

The U.S. stock market experienced a rapid swing between caution and excessive optimism in just two weeks, according to Bloomberg Línea, which reported it via its Instagram account on September 29, 2026. During this period, the technology-heavy Nasdaq 100 index posted losses of more than $600 billion before starting a recovery phase that lifted its valuation by $3 trillion.

The index tracks the 100 largest non-financial companies listed on the Nasdaq stock exchange, spanning key sectors such as software development, biotechnology and, most notably, artificial intelligence. The heavy concentration of capital in these large technology corporations makes the index highly sensitive to any change in growth expectations or in the investment volumes allocated to the sector.

Recent volatility reflects how investors are rapidly adjusting their portfolios in response to forecasts of corporate spending and the valuations of technology companies. These swings respond to the constant reassessment of capital flows toward the artificial intelligence industry, a central driver of international financial markets in recent years.

For global markets and investment funds, moves of this magnitude highlight how quickly investor sentiment can swing between fear of a slowdown and a new wave of stock market euphoria. Economic actors remain focused on the sustainability of spending on technology infrastructure and on the real returns these investments will deliver over the long term.