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Mexico probing if US violated sovereignty in 2024 drug lord capture
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Nigeria's Dangote confirms Lamu, Kenya for east Africa mega-refinery
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Zverev reaches first Wimbledon quarter-final
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Study points to likely route for Hannibal's legendary Alpine crossing
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Nordic joy as Traeen takes yellow, Pedersen wins Tour de France 4th stage
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Australia's Mooney back at No 1 in batting rankings after World Cup heroics
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Electric Our Lady land: guitar made from burned Notre Dame wood
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Traeen takes yellow, Pedersen wins Tour de France 4th stage
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Tanker attacks send oil higher, stocks hit by AI jitters
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UK hard-right leader Farage resigns as MP to force snap vote in finances row
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IOC shuffle 2030 Winter Games events and promise gender parity
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Harry Kane calls for calm after England's World Cup epic against Mexico
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Macron says Syria must not be destabilised after bombs wound 18
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Beleaguered Prince Harry loses lawsuit against UK tabloid
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France's Le Pen to announce if running for president with ankle tag
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Sinner eyes Djokovic showdown after moving into Wimbledon semis
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France get ready to face 'lost treasure' Bouaddi in Morocco World Cup clash
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Sinner conquers heat, sets up potential Djokovic clash at Wimbledon
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Trump berates NATO, praises Erdogan as summit starts
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'Veteran' Gauff completes Slam semi-final set with Wimbledon fightback
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Blazy's Chanel fairy tale continues with whimsical couture show
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UK hard-right leader resigns as MP to force snap vote in finances row
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Stocks hit by AI concerns as oil rises on tanker attack
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US trade gap in May widens to biggest in over a year
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Prince Harry, Elton John lose case against UK tabloid
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France's Le Pen cleared to run for president but with ankle tag
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Serena wants to play again before US Open, says coach
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Sign of the times: Harry Styles sets record with 12-night Wembley run
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Kenya, Tanzania shut down protest anniversaries
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France's Le Pen arrives in court for key ruling in race for president
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Women pushed back to Afghanistan pin hopes on rare private sector jobs
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Paris FC confirm Rosenior taking over as coach
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Cuba slowly gets power back after third nationwide blackout in six months
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Thousands without power in US Pacific islands after super typhoon
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NATO summit showcases arms deals in push to win over Trump
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Prince Harry to discover outcome of UK tabloids case
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Seoul dives on tough day for Asia as Samsung fails to ease tech woes
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Messi v Salah in World Cup last-16 showdown
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Democrats push key US Senate candidate to quit over sex assault claim
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Death toll from China storms rises to 15, hundreds injured
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As South Korean Buddhism woos Gen Z, how hip is too hip?
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Belgium boosted by Balogun furore: Tielemans
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'Disappointed' Pochettino says Balogun row no excuse for US World Cup exit
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Samsung expects 1,800% operating profit leap on AI boom
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Seoul dives on mixed day in Asia as Samsung fails to ease tech woes
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Belgium thrash USA to end World Cup dream and set up Spain showdown
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Belgium dump US out of World Cup after Balogun row
Asian markets tumble as tech bubble fears grow
Tech companies led a sharp sell-off across Asia on Wednesday as investors grow increasingly worried about an AI 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 artificial intelligence, including US 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 Monday, Wall Street tumbled on Tuesday, with the tech-rich Nasdaq down more than two percent and the S&P 500 off more than one percent.
US software firm Palantir slumped 8.0 percent despite reporting a 63 percent 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 six percent at one point, as chip giants Samsung and SK hynix each lost around seven percent.
"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 five percent further and that "SK hynix and Samsung may also see corrections proportional to their earlier gains".
Tokyo dived more than four percent as tech investment giant SoftBank shed 14 percent and Sony more than two percent.
Nintendo, however, briefly jumped more than 10 percent a day after the gaming firm hiked forecasts for its Switch 2 console and annual profits.
- 'Sea of red' -
Taipei was off more than two percent as market heavyweight and chip-maker TSMC gave up three percent.
There were also big losses in Hong Kong, Shanghai, Singapore, Sydney, Wellington, Manila and Jakarta.
"It's a sea of red across broad markets, and one that offers a gloomy and damp portrayal of risk," said Chris Weston at Pepperstone.
"In the lead-up to the session, traders had been rotating out of the lower-quality end of the market and into the higher-quality plays, and this dynamic resulted in poor breadth within the US equity indices."
He said that dynamic had changed and traders were "cutting back on their winners and locking in performance, with the Magnificent Seven (leading tech stocks) basket and AI plays driving equity risk lower."
And Mike Gitlin, president and chief executive officer of Capital Group, said that while earnings are strong "what's challenging are valuations", according to Bloomberg.
His comments came at a financial summit organized by the Hong Kong Monetary Authority on Tuesday, where other business leaders including Morgan Stanley boss Ted Pick and Goldman Sachs' David Solomon warned of a big correction.
Meanwhile, Saxo Markets' Charu Chanana said two questions were echoing across portfolios.
"Those who've ridden the rally from early 2023 are sitting on substantial gains and wondering if it's time to lock in profits (and) those still on the sidelines are feeling the pull of (fear of missing out, questioning if they've missed the best entry point.
"Both are fair concerns. The AI boom has pushed the 'Magnificent' names to new highs, but under the surface, their stories have begun to diverge between companies monetising AI today and those still investing for tomorrow."
The uncertainty across markets was also felt in the crypto universe, where bitcoin briefly fell below $100,000 for the first time since June, a month after topping out at a record high above $126,000.
- Key figures at around 0230 GMT -
Tokyo - Nikkei 225: DOWN 4.7 percent at 49,104.05 (break)
Hong Kong - Hang Seng Index: DOWN 1.1 percent at 25,676.11
Shanghai - Composite: DOWN 0.4 percent at 3,943.45
Euro/dollar: DOWN at $1.1487 from $1.1479 on Tuesday
Pound/dollar: DOWN at $1.3017 from $1.3019
Dollar/yen: DOWN at 153.17 yen from 153.66 yen
Euro/pound: UP at 88.25 pence from 88.17 pence
West Texas Intermediate: DOWN 0.7 percent at $60.13 per barrel
Brent North Sea Crude: DOWN 0.6 percent at $64.05 per barrel
New York - Dow: DOWN 0.5 percent at 47,085.24 (close)
London - FTSE 100: UP 0.1 percent at 9,714.96 (close)
J.Horn--BTB