AI bubble fears return as Wall Street falls back from short-lived rally

Leading US stock markets tumble less than 24 hours after strong results from chipmaker Nvidia sparked gains

Fears of a growing bubble around the artificial intelligence frenzy resurfaced on Thursday as leading US stock markets fell, less than 24 hours after strong results from chipmaker Nvidia sparked a rally.

Wall Street initially rose after Nvidia, the world's largest public company, reassured investors of strong demand for its advanced data center chips. But the relief dissipated, and technology stocks at the heart of the AI boom came under pressure.