KOSPI erases a 4% drop and closes up 0.3% at 5,550.30

South Korea's main stock index, the KOSPI, had a wild Friday, 23 October 2026. It opened 2.36% lower, according to Yonhap. During the session it was down more than 4%, KED Global reports. By the close it was up 16.53 points, or 0.3%, at 5,550.30. Yonhap says investors hunted for bargains in major chip stocks.

The trigger came from the United States. On Thursday 22 October the Nasdaq Composite fell 2.6% and the S&P 500 fell 1.21%. The Dow Jones Industrial Average edged up 0.02%. Micron fell 6.26%, Nvidia 4.4% and Intel 8.04%. MoneyToday adds that Meta shares fell about 7%, because its large AI investment plan raised worries about funding and profitability. The Philadelphia Semiconductor Index dropped 7% at one point in the session, it says. Seoul had already fallen 3.52% on Thursday, to 5,533.77, KED Global reports.

The rebound had a local spark. Before the open, SK Hynix said it would halt its review of a US listing for Solidigm, its NAND-memory subsidiary. An SK Hynix official said the reason was recent capital market conditions and share price trends, not the growth outlook of Solidigm. KED Global says SK Hynix rallied after the company dropped the plan. Yonhap has SK Hynix up 4.42% at 1.28 million won after opening lower. Samsung Electronics rose 0.47% to 215,500 won.

Why does a Seoul index matter to a reader in another country? Bloomberg, quoted by CNBC-TV18, calls the KOSPI a key indicator for the AI sector. That makes it a useful place to read the mood about AI. This is our reading, not a claim from the sources.

Now the caution. A 0.3% gain after a 4% drop looks calm, but it hides a lot. KED Global says weakness across most large caps points to fragile sentiment. Yonhap describes most large-cap shares as mixed. Individual investors were net sellers early and turned net buyers later. Yonhap also notes the won strengthened a little, to 1,324.6 per dollar at 3:30 p.m. Seoul time.

What we do not know is whether this is a pause or a turn. One session cannot tell. The sources do not say what would settle the AI spending worry. We are not forecasting, and this is not investment advice.

Fatos confirmados

• On Friday 23 October 2026 the KOSPI rose 16.53 points, or 0.3%, to close at 5,550.30.^[1][2]
• The index opened 2.36% lower. Individual investors, net sellers early in the session, turned to net buying.^[1]
• The KOSPI was down more than 4% earlier in the session.^[2]
• The KOSPI closed down 3.52% at 5,533.77 on Thursday 22 October.^[2]
• On Thursday in New York the Nasdaq Composite fell 2.6%, the S&P 500 fell 1.21% and the Dow Jones Industrial Average rose 0.02%.^[1][3]
• Micron fell 6.26%, Nvidia 4.4% and Intel 8.04%.^[1]
• Meta shares fell about 7%. Its large AI investment plan raised concerns about funding burden and profitability.^[3]
• The Philadelphia Semiconductor Index dropped 7% during intraday trading.^[3]
• SK Hynix said before the open on 23 October that it would halt its consideration of a Solidigm IPO, citing recent capital market conditions and share price trends.^[3]
• KED Global says SK Hynix rallied after abandoning plans to list its US NAND-memory subsidiary Solidigm.^[2]
• SK Hynix rose 4.42% to 1.28 million won after opening lower. Samsung Electronics rose 0.47% to 215,500 won.^[1]
• Yonhap says investors hunted for bargains in major chip stocks amid persistent concerns over investments in the AI value chain.^[1]
• KED Global says weakness across most large caps points to fragile sentiment.^[2]
• Yonhap describes most large-cap shares in Seoul as trading mixed.^[1]
• The Korean won was quoted at 1,324.6 per US dollar at 3:30 p.m., up 0.4 won from the previous close.^[1]
• Bloomberg, quoted by CNBC-TV18, describes the KOSPI as a key indicator for the AI sector.^[4]

Implicações

• ConfirmadoThe KOSPI closed higher even though it was down more than 4% during the day.
• ConfirmadoWorries about AI spending in the US pass quickly into the South Korean market.
• ConfirmadoOne up day does not prove the worry has passed: weakness across most large caps points to fragile sentiment.
• Nossa leituraNews about AI spending at big tech firms could shake the Asian chip market again.

Ainda não se sabe

• Whether this is a pause in the selloff or a turn. One session cannot tell.
• What would settle the worry about AI spending. The sources do not say.
• How the US market will trade in the next session.

Quem é afetado

South Korea, United States, Worldwide. People who follow the chip and AI market, and readers curious how worries about AI spending reach Asia

Fontes

1. Yonhap News Agency: Seoul stocks end tad higher on bargain hunting 23 de outubro de 2026 · mídia
2. KED Global: Kospi reverses 4% drop to close higher as SK Hynix rebounds 23 de outubro de 2026 · mídia
3. MoneyToday: KOSPI clings to 5,300 amid fallout from Meta-led US tech sell-off 23 de outubro de 2026 · mídia
4. CNBC-TV18: Asian markets under pressure over AI viability worries; KOSPI down over 3.50% 22 de outubro de 2026 · mídia