South Korea's benchmark KOSPI index fell sharply on October 23, 2026, dropping as much as 4.1% in early trading before paring losses, as Samsung Electronics and SK Hynix tracked an overnight sell-off in U.S. technology and chip shares. The move extended a fourth straight week of declines driven by investor doubts over the profitability of massive AI-related spending.
South Korea's KOSPI benchmark index fell as much as 4.1% in early trading on Friday, October 23, 2026, briefly touching an intraday low of 5,305.98 points, according to BigGo Finance. By late morning local time, the index had pared roughly half of those losses, trading down 2.44% at 5,398.48 points, The Korea Times reported.
Chip Stocks Swing Through the Session
Samsung Electronics, the index's largest component, fell as much as 4.20% intraday before easing to a 3.03% loss by late morning, per figures reported by BigGo Finance and The Korea Times. SK Hynix showed a sharper reversal: an early drop of around 3% narrowed to just 0.25% after the company suspended its review of an initial public offering for its Solidigm storage subsidiary, a move BigGo Finance said helped ease concern that a separate listing would trigger a holding-company discount on SK Hynix shares.
Overnight Wall Street Losses Set the Tone
The Asian session followed a broad U.S. technology sell-off on October 22. The Nasdaq Composite fell 2.60% and the Philadelphia Semiconductor Index tumbled 6.7%, while the S&P 500 lost 1.21% and the Dow Jones Industrial Average was roughly flat, according to BigGo Finance. Among individual chip names, Intel fell 8.04%, Micron Technology dropped 6.26% and Nvidia lost 4.4%.
BigGo Finance linked part of the move to Meta's latest earnings: despite 26% revenue growth, the company's free cash flow swung to a deficit of about $2.12 billion after it raised capital-spending projections, shifting investor attention from growth metrics to cash burn tied to AI infrastructure. GuruFocus separately reported that rising oil prices also weighed on U.S. tech sentiment overnight.
A Fourth Straight Weekly Decline
The October 23 drop extended a losing streak. On October 22, the KOSPI fell 3.52% to close at 5,533.77, erasing a rebound from the prior session, according to The Korea Times and Aju Press. Samsung Electronics lost 4.03% that day to 214,500 won and SK Hynix dropped 5.49% to 1.22 million won, while the tech-heavy KOSDAQ fell 3.62%, according to Aju Press.
Two days earlier, on October 20, the KOSPI had already fallen 3.73% to 5,552.74, with foreign and institutional investors posting combined net sales of about 1.54 trillion won ($1.16 billion), UPI reported. Battery maker EcoPro BM fell 9.15% and Hyundai Motor dropped 4.91% that session.
GuruFocus reported that the KOSPI had declined roughly 20% during October, making it the worst-performing major stock market globally for the month, a slide the outlet attributed to growing doubts over whether heavy AI capital expenditure will translate into steady profit.
Bank of Korea Holds Rates Steady
The declines coincided with a Bank of Korea policy decision. On October 22, the central bank's Monetary Policy Board voted unanimously to hold its base rate at 3.0%, pausing after quarter-point increases in July and August, Aju Press reported. Governor Shin Hyun-song described the pause using a Korean proverb he translated as the "fruit of hoe work," referring to addressing problems early, and said the timing of any further increase would depend on upcoming third-quarter GDP and inflation data. Aju Press cited a survey in which 18 of 20 economists still expected another rate hike in November.
KOSPI daily moves, October 20–23, 2026
Date
Change
Closing/latest level
Context
Oct 20
-3.73%
5,552.74
Foreign and institutional investors net-sold about 1.54 trillion won (UPI)
Oct 22
-3.52%
5,533.77
Erased prior-day rebound; Bank of Korea held rate at 3.0% (Korea Times, Aju Press)
Oct 23 (late morning)
-2.44%
5,398.48
Pared an earlier intraday drop of as much as 4.1% (Korea Times, BigGo Finance)
KOSPI fell as much as 4.1% intraday on October 23 before paring losses to about 2.44%, BigGo Finance and The Korea Times reported.
The move tracked an overnight Wall Street sell-off in which the Philadelphia Semiconductor Index fell 6.7% and the Nasdaq Composite fell 2.60%.
SK Hynix shares recovered part of their losses after the company suspended an IPO review for its Solidigm subsidiary.
The KOSPI has fallen roughly 20% in October, the worst performance among major global stock markets for the month, according to GuruFocus.
The Bank of Korea held its base rate at 3.0% on October 22 after two straight quarter-point hikes, per Aju Press.
Although Meta and Tesla reported earnings that exceeded market expectations, their results failed to ease concerns over profitability amid massive AI investments.
— Lee Kyoung-min, analyst at Daishin Securities, quoted by The Korea Times
Questions
Why did South Korean stocks drop sharply on October 23, 2026?
The KOSPI tracked an overnight sell-off in U.S. technology and semiconductor shares, with chipmakers Samsung Electronics and SK Hynix leading early losses before the index pared about half of an intraday drop of as much as 4.1%, according to BigGo Finance and The Korea Times.
How much has the KOSPI fallen in October 2026?
GuruFocus reported the index had declined roughly 20% during the month, making it the worst-performing major stock market globally in October.
What did the Bank of Korea decide on interest rates?
On October 22, 2026, the Bank of Korea's Monetary Policy Board unanimously held its base rate at 3.0%, pausing after quarter-point hikes in July and August, Aju Press reported.
Why did SK Hynix shares recover some losses on October 23?
SK Hynix suspended its review of an IPO for its Solidigm storage subsidiary, which BigGo Finance said reduced concern about a holding-company discount and helped the stock pare earlier losses.
What triggered the overnight Wall Street sell-off that hit Asian chip stocks?
BigGo Finance reported that the Philadelphia Semiconductor Index fell 6.7% and the Nasdaq Composite fell 2.60% after Meta's earnings showed a swing to negative free cash flow despite revenue growth, intensifying investor focus on the cost of AI infrastructure spending; GuruFocus also noted rising oil prices weighed on sentiment.
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