The 'Wizard of Wharton' says a tech bubble may be forming - and AI stocks like Nvidia could crash

• A speculative bubble in tech stocks may be starting to form, Jeremy Siegel said.
• The "Wizard of Wharton" said Nvidia could rise further, but the tech rally would eventually stall.
• Siegel said he isn't worried about the US economy overheating, and inflation seems under control.

The breathless hype around technology stocks like Nvidia is nearing dangerous levels, Jeremy Siegel warned.

"The beginnings of a speculative bubble may be forming but it is impossible to tell when it will end," the retired finance professor known as the "Wizard of Wharton" said in his weekly WisdomTree commentary on Monday.