HONG KONG: Tech companies led a sharp sell-off across Asia on Wednesday (Nov 5) as investors grow increasingly worried about an artificial intelligence bubble following a rally this year that has seen valuations hit record highs.

Global markets have soared this year as an eye-watering flood of cash piled into companies linked to AI, including United States titans Nvidia, Amazon and Apple, as well as Asian firms Samsung and Alibaba.

But despite strong earnings releases in recent quarters, traders have started questioning the wisdom of chasing ever-higher prices, with cash mostly funnelled into a handful of big-name companies.

The gains have also been helped by an easing of US trade tensions and expectations that the Federal Reserve will continue to cut interest rates into the new year.

But last week's warning from the US central bank that another reduction in December was not a foregone conclusion jolted sentiment.

After an uncertain start to the week on Monday, Wall Street tumbled on Tuesday, with the tech-rich Nasdaq down more than 2 per cent and the S&P 500 off more than 1 per cent.

US software firm Palantir slumped 8 per cent despite reporting a 63 per cent surge in revenues and profits.

Asia took up the baton in the morning, with Seoul and Tokyo the hardest hit, having just hit record highs.

Seoul tanked 6 per cent at one point, as chip giants Samsung and SK hynix each lost around 7 per cent.

"I view today's decline as a correction to cool off an overheated market - a phase of adjustment," Chung Hae-chang, analyst at Daishin Securities, told AFP.

"The recent rally was extremely steep, so this is the counterbalance."

He also warned Seoul's Kospi index could decline 5 per cent further and that "SK hynix and Samsung may also see corrections proportional to their earlier gains".

Tokyo dived more than 4 per cent as tech investment giant SoftBank shed 14 per cent and Sony more than 2 per cent.

Nintendo, however, briefly jumped more than 10 per cent a day after the gaming firm hiked forecasts for its Switch 2 console and annual profits.

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Taipei was off more than 2 per cent as market heavyweight and chip-maker TSMC...