New Delhi, Nov. 21 -- The US key index, the S&P 500, is on track to post its worst November performance in 17 years, as the AI-led rally that powered Wall Street to multiple record highs in recent months has fizzled out amid growing concerns over its sustainability.

Investors have responded by continuing to sell shares of technology companies, particularly those in the artificial intelligence space, even as Nvidia reported better-than-expected Q3 numbers along with upbeat guidance.

The selling pressure comes amid fears in Silicon Valley and beyond of a potential bubble, as the value of AI tech companies has soared in recent months and companies have invested heavily in the burgeoning industry, though the results of these investments hav...