South Korea’s Kospi index sinks more than 7% on semiconductor share sell-off over AI boom worries

HONG KONG — South Korea’s benchmark Kospi index dropped more than 7% Tuesday on a sell-off of chip shares, and Asian shares mostly declined after U.S. stocks ended mixed.

U.S. futures were also mixed, and oil prices fell as escalating tensions in the Middle East continued.

The Kospi index was down 7.4% to 5,914.35, its lowest level since late July. It reached an all-time high in June after crossing 9,000, supercharged by the global artificial intelligence boom.

Samsung Electronics fell 7.7%, while memory chipmaker SK Hynix plunged 8.8%.

Investors’ unease over the AI boom has clouded prospects. Both companies’ stocks fell following reports that the latest advances made by China’s memory chipmaker CXMT could increasingly challenge Samsung Electronics, SK Hynix and Micron Technology, the world’s biggest memory chipmakers.

Japan’s Nikkei 225 dropped 2.5% to 67,292.39. Chip equipment maker Tokyo Electron fell 6.6%. SoftBank Group, an OpenAI investor, lost 8%.

Hong Kong’s Hang Seng fell 1% to 24,033.51. The Shanghai Composite index was 1.1% lower at 3,754.82.

Australia’s S&P/ASX 200 edged down 0.2% to 8,767.40.

Taiwan’s Taiex fell 1.9%, with its leading chipmaker TSMC, or Taiwan Semiconductor Manufacturing Co., down 1.6%.

On Monday, Wall Street’s benchmark S&P 500 edged down 0.1%. The Dow Jones Industrial Average added 0.4%, and the technology-heavy Nasdaq composite declined 0.4%.

For Subscribers

FOR SUBSCRIBERSThe American consumer keeps spending. How much longer can it last?

FOR SUBSCRIBERSAttack on Saudi airport dials up pressure on D.C.

FOR SUBSCRIBERSRepublican attempts to trip up James Talarico keep backfiring

FOR SUBSCRIBERSAnother Hormuz? What to know about the Houthi threat to the Red Sea

FOR SUBSCRIBERSGOP ad buyer mixes up Portlands, spends money meant to help Maine Sen. Susan Collins in Oregon

FOR SUBSCRIBERSJane Doe’s night started with catching up. It ended with a frat party that changed everything.

FOR SUBSCRIBERS‘Trump never cared about us’: Ukraine smarts at U.S. pressure and deal with Putin

FOR SUBSCRIBERSFacing smaller crowds and low approval ratings, Trump tries to rally the base

FOR SUBSCRIBERSAcross both parties, Black candidates look to make history in governor’s races

FOR SUBSCRIBERSAbortion isn’t top of mind for voters, but Democrats are betting it could motivate their base

FOR SUBSCRIBERSFlock ‘false flags’ lead to frightening motorist encounters with police

FOR SUBSCRIBERSInside one country’s ambitious campaign to plant 50 billion trees

FOR SUBSCRIBERSOne year on, Gaza ceasefire exists ‘in name only,’ aid groups say amid near-daily Israeli strikes

FOR SUBSCRIBERSBad blood spills over in the Texas Senate race — and it’s tearing Republicans apart

FOR SUBSCRIBERSOpenAI said it solved hundreds of math problems. The results are dividing mathematicians.

Slide 1 of 1

For Subscribers

FOR SUBSCRIBERSThe American consumer keeps spending. How much longer can it last?

FOR SUBSCRIBERSAttack on Saudi airport dials up pressure on D.C.

FOR SUBSCRIBERSRepublican attempts to trip up James Talarico keep backfiring

FOR SUBSCRIBERSAnother Hormuz? What to know about the Houthi threat to the Red Sea

FOR SUBSCRIBERSGOP ad buyer mixes up Portlands, spends money meant to help Maine Sen. Susan Collins in Oregon

FOR SUBSCRIBERSJane Doe’s night started with catching up. It ended with a frat party that changed everything.

FOR SUBSCRIBERS‘Trump never cared about us’: Ukraine smarts at U.S. pressure and deal with Putin

FOR SUBSCRIBERSFacing smaller crowds and low approval ratings, Trump tries to rally the base

FOR SUBSCRIBERSAcross both parties, Black candidates look to make history in governor’s races

FOR SUBSCRIBERSAbortion isn’t top of mind for voters, but Democrats are betting it could motivate their base

FOR SUBSCRIBERSFlock ‘false flags’ lead to frightening motorist encounters with police

FOR SUBSCRIBERSInside one country’s ambitious campaign to plant 50 billion trees

FOR SUBSCRIBERSOne year on, Gaza ceasefire exists ‘in name only,’ aid groups say amid near-daily Israeli strikes

FOR SUBSCRIBERSBad blood spills over in the Texas Senate race — and it’s tearing Republicans apart

FOR SUBSCRIBERSOpenAI said it solved hundreds of math problems. The results are dividing mathematicians.

Slide 1 of 1

Chip-related shares traded lower. Nvidia was down 1.3%. Advanced Micro Devices, or AMD, was 2.3% lower. Micron Technology lost 3.9%. Broadcom fell 1.9%.

Investors are also watching this week’s earnings announcements by major firms including big banks, with Citigroup, JPMorgan Chase and Wells Fargo reporting results.

Oil prices dropped more than 1%. Brent crude, the international standard, fell 1.4% to $105.20 a barrel. That’s still higher than the roughly $72 per barrel in late February, before the Iran war.

Benchmark U.S. crude was down 1.5% to $92.34 a barrel.

“The market is more concerned over recent developments in the Middle East, with Houthi attacks on Saudi Arabia and the lingering risks to oil flows from the Persian Gulf,” wrote ING commodities strategists Warren Patterson and Ewa Manthey in a commentary Tuesday.

The U.S. dollar fell to 158.26 Japanese yen from 158.61 yen. The euro was trading at $1.1175, up from $1.1155.