In New York, shares in Nvidia, which had surged in Thursday morning trading, fell by more than 3%.
“The reaction is noteworthy, because what should have happened didn’t happen,” said James Stanley, a senior analyst at StoneX, referring to the sudden fade in the broader US market rally on Thursday.
“You’ve got to ask what’s happening under the surface.”
Wealthify investment consultant Colleen McHugh told the BBC’s Today programme that November has been a “bad month” for the Nasdaq.
“We’re still not getting away from this concern about this AI bubble,” she said.
The price of Bitcoin also fell on Thursday, extending recent declines and falling below $90,000 to its lowest since April. Analysts attributed the drop to, in part, concern about AI valuations.
Fears of an AI bubble continue to swirl, even though Nvidia’s results, which showed the chip giant powering on amid robust demand for its AI chips, briefly lifted stocks after-hours on Wednesday and early Thursday.
Chief executive Jensen Huang dismissed concerns that AI companies are overvalued. “From our vantage point, we see something very different,” he said on a call with analysts.
But fears on Wall Street persist, investment analysts said, despite Mr Huang’s reassurance and blockbuster results from the chip-maker, which is seen as a bellwether for the AI boom. Those fears have picked up this month.
Ms McHugh said the issue is the fear over the concentration in the market as stocks in the so-called magnificent seven – or mag seven – tech companies including Alphabet, Apple and Microscoft have been driving the market.
“These mag seven stocks are making up about 33% of the S&P 500 and when the momentum is going in your favour that’s great, but when momentum is going down as we’ve seen over the last week plus, people get a bit nervous, and that’s what we’re seeing now,” she said.
In Asia, Japan’s Nikkei 225 was down by 2.4% when the market closed, with technology investment giant Softbank plunging by nearly 11%.
South Korea’s Kospi was down by 3.8% upon closing. Shares in chipmaker SK Hynix fell by nearly 9% and Samsung was almost 5.8% lower.
Hong Kong’s Hang Seng was down by about 2%.
Speaking to the BBC this month, Alphabet chief executive Sundar Pichai warned of some “irrationality” in the current AI boom.
Analysts with Oxford Economics said the recent technology draw-down signals “a healthy correction rather than the start of something more threatening”. Earlier this week, they warned that tech stocks might suffer from profit taking in the near term, but noted that “it’s too early to call an end to the AI investment boom”.
