South Korean equities suffered a sharp decline on Wednesday, with the KOSPI dropping 2.9% to 6,640.26 by late morning, as a surge in oil prices and global bond yields pressured the index's heavyweight technology and industrial names. The selloff made Seoul one of Asia's weakest major markets, with Samsung Electronics falling 2.97% and SK Hynix losing 3.13%. Other notable decliners included Hyundai Mobis, HD Hyundai Heavy Industries, and Hanwha Aerospace.
The downturn followed a risk-off session on Wall Street and came as Brent crude approached $96 a barrel, reviving concerns about inflation and interest rates. The US 10-year Treasury yield reached approximately 4.81%, near a three-year high, increasing the discount rate applied to growth stocks and disproportionately affecting technology-heavy indices like the KOSPI.
Buybacks provide limited cushion
The KOSPI's weakness is particularly notable because Samsung and SK Hynix had helped stabilize the benchmark just a day earlier through large share-buyback programs. However, those efforts proved insufficient as foreign and institutional investors returned as sellers on Wednesday morning, while retail investors bought the dip. Market data showed foreigners sold a net 56.6 billion won and institutions 10.2 billion won early in the session.
Kiwoom Securities researcher Han Ji-young told The Asia Business Daily that Korean equities have become unusually sensitive to negative macro variables, particularly oil prices and long-term yields. She noted that investors now need to watch whether US-Iran tensions ease and whether bond markets in the US and Japan can stabilize. This leaves Korea's strong AI-memory story temporarily overshadowed by macro risk.
Oil's dual impact on Korea
Brent crude climbed towards $95.91 a barrel after renewed US strikes on Iran raised fears of further disruption around the Strait of Hormuz, with US crude also moving above $90. For South Korea, the problem extends beyond energy-company margins. The country relies heavily on imported fuel, so a sustained oil spike threatens corporate costs, household inflation, and the trade balance.
Higher crude is also pushing global yields upwards, adding to the pressure on growth stocks. This dynamic is particularly acute for Samsung, SK Hynix, and other technology-heavy KOSPI constituents, which are sensitive to discount rate changes.
Regional selloff confirms global rates shock
The selloff spread across Asia, with Japan's Nikkei 225 dropping about 2.2% to 64,742. SoftBank fell 4.1%, Advantest 4%, and Tokyo Electron 4.5%. MSCI's broad Asia-Pacific index excluding Japan declined roughly 1.5%, while US equity futures were slightly weaker after the S&P 500 lost 0.7% and the Nasdaq dropped 1% overnight.
The immediate question for Seoul is whether buybacks and strong semiconductor fundamentals can again attract buyers around the 6,600 area. An analyst cited by The Asia Business Daily said Samsung and SK Hynix repurchases could continue cushioning supply-demand conditions into the third-quarter earnings season, although buybacks alone cannot indefinitely offset broad investor selling.
Investors are also watching other markets for cues. For instance, CoreWeave's stock faces bearish signals despite strong revenue growth, while Nio shares hit a 7-month low despite a revenue jump. Meanwhile, gold's next move hinges on Fed policy and Treasury buybacks, and the KOSPI's recent rebound on chip strength may be tested by these macro headwinds.
This article is for informational purposes only and does not constitute financial advice.
