San Francisco Frontiers - Asian markets plunge with Wall St after Nvidia rout, weak US data

The sight of investors running to the hills sparked memories of the brief but tumultuous sell-off at the start of August that was partly fuelled by a big miss on US jobs creation.

All three leading indexes in New York ended sharply lower Tuesday, with the Nasdaq the main casualty -- diving more than three percent -- as traders dumped big-name tech firms including Apple, Alphabet and Amazon.

But the biggest loser was AI chip leader Nvidia, which tanked 9.5 percent -- shedding almost $280 billion of its value -- on fears that the surge in firms linked to artificial intelligence may have run too far.

That came amid a warning that spending on all things AI by companies in recent years would need to be justified unless demand outside of the tech realm picked up and that it could take some time to begin paying off.

Adding to the pain, it emerged after US markets closed that US authorities had issued Nvidia and other firms subpoenas as it probes claims they violated antitrust laws.

The selling filtered through to Asia, where tech and chip firms took the brunt of it.

Japan's Advantest plunged 8.2 percent and Tokyo Electron more than seven percent, while Sony lost 2.3 percent.

TSMC shed more than four percent in Taipei, with SK hynix dumped 6.5 percent in Seoul and Samsung more than two percent off.

That led Asian markets deep into the red.

Tokyo and Taipei each dived more than three percent, while Seoul was more than two percent lower. Hong Kong, Sydney, Singapore and Manila gave back more than one percent.

Shanghai and Wellington were also down.

Worries about the US economy burst back onto the scene after figures showed a marginal improvement in factory activity in August but it still remained in contraction for a fifth successive month.

The figures come days before a closely watched report on non-farm payrolls, which could have a big impact on Federal Reserve officials' decision-making going into next week's policy meeting.

The bank is expected to cut interest rates but the debate surrounds how big it will go, with most tipping a 25-basis-point reduction but a below-forecast reading seen boosting the chances of a 50-point move.

While weaker readings on jobs and the economy have in the recent past been seen as positive owing to the chances of the Fed cutting rates, analysts warned that the bad news was now being taken as a worrying sign for the economy.

"A 50-basis-point cut might not be the market's best friend if it shows up alongside signs of labour market weakness," said independent analyst Stephen Innes.

"In that scenario, those cuts could be viewed less as a soft landing cushion and more as a last-ditch effort to steer clear of a full-blown economic crash."

The chances of a bigger Fed rate cut pushed the dollar down against the yen, which had already been given a boost Tuesday by comments from Bank of Japan boss Kazuo Ueda, who said it could hike rates again if the country's economy and inflation perform as expected.

Oil extended losses after the previous day's heavy selling sparked by demand worries linked to a weak Chinese economy and questions over the US outlook, while OPEC's consideration of output hikes added to the pain.

- Key figures around 0200 GMT -

Tokyo - Nikkei 225: DOWN 3.4 percent at 37,378.35

Hong Kong - Hang Seng Index: DOWN 1.6 percent at 17,370.29

Shanghai - Composite: DOWN 0.7 percent at 2,784.85

Dollar/yen: DOWN at 145.40 yen from 145.46 yen on Tuesday

Euro/dollar: UP at $1.1050 from $1.1047

Pound/dollar: DOWN at $1.3105 from $1.3111

Euro/pound: UP at 84.32 pence from 84.17 pence

West Texas Intermediate: DOWN 0.6 percent at $69.89 per barrel

Brent North Sea Crude: DOWN 0.6 percent at $73.34 per barrel

New York - Dow: DOWN 1.5 percent at 40,936.93 (close)

New York - S&P 500: DOWN 2.1 percent at 5,528.93 (close)

New York - Nasdaq Composite: DOWN 3.3 percent at 17,136.30 (close)

London - FTSE 100: DOWN 0.8 percent at 8,298.46 (close)

E.Walker--SFF