Major US tech companies have lost more than $1 trillion in market value since the beginning of November 2025

This has been driven by growing fears that the artificial intelligence (AI) boom is unsustainable and that some stocks are overvalued.

The sell-off has hit the so-called "Magnificent Seven" and other AI-linked companies particularly hard.

Companies ramping up spending on AI, like online property portal Rightmove and Meta, have seen their share prices fall as investors worry about profitability.