A person walks previous in entrance of an digital display screen exhibiting South Korea’s benchmark inventory index (KOSPI) on the Korea Alternate in Seoul on March 3, 2026.
Jung Yeon-je | Afp | Getty Photos
South Korean shares rapidly fell from grace following the U.S. and Israeli strikes on Iran. However Wall Road would not see that as a harbinger for something that is to come back within the U.S.
The benchmark Kospi Index tumbled greater than 12% Wednesday — its worst-ever single day of buying and selling. Korean shares have plungedmore than 18% up to now this week, on observe for his or her greatest weekly loss since 2008.
South Korea’s inventory market was darkish on Monday for a nationwide vacation. However a pointy selloff got here Tuesday when markets reopened Tuesday within the wake of the Mideast battle. Korea imports practically all its fossil fuels, together with oil and pure fuel, all of it introduced in by tanker. About 70% of Korea’s oil imports and as much as 30% of liquified pure fuel comes from the Center East, in line with the U.S. Vitality Info Company.
The KOSPI Index, 5-day chart
Each the U.S. and Korean markets have been described as concentrated in a handful of shares. However U.S. traders are fast to level out that Korea’s focus is much better than even the U.S. What’s extra, U.S. indexes just lately hadn’t seen dramatic positive factors as had their worldwide counterparts.
“It is all about perspective,” stated Jay Woods, chief market strategist at Freedom Capital Markets.
Ranges of focus
A couple of-third of the Korean index is made up of solely Samsung Electronics and SK Hynix, Larry Tentarelli of the Blue Chip Development Report famous. By comparability, the 2 largest shares within the S&P 500 — Nvidia and Apple — account for 14% of the index, he stated.
Samsung Electronics has soared 216% previously 12 months. SK Hynix, a semiconductor maker, is up 356% over the previous yr, even together with its newest decline, leaving them each “extraordinarily prolonged,” Tentarelli stated. If Nvidia and Apple had made such a run, the S&P 500 could be up greater than 40% yr up to now. As an alternative, the S&P 500 is little modified in 2026.
“These numbers are positively brief time period bubble numbers, which led to the sharp correction,” Tentarelli stated.
SK Hynix and Samsung Electronics each plunged by 10% or extra in Wednesday’s buying and selling in Seoul, at one level resulting in a brief suspension of buying and selling on the Korea Alternate, the nation’s inventory market.
Regardless of the U.S. market being “very headline pushed,” with geopolitical developments usually driving investor sentiment within the midst of the U.S.-Iran conflict, Tentarelli stated any index volatility would pale subsequent to the Kospi’s drop this week.
A 12% one-day decline within the U.S. market would really feel just like the “finish of the world,” Woods stated. However due to the broad diversification within the U.S., along with NYSE and Nasdaq circuit-breakers, each based mostly on the S&P 500, Woods stated he would not imagine such a slide is probably going.
U.S. market crashes are sometimes about breadth — and so far, breadth has held up, particularly contemplating the backdrop, Woods added.
Korea’s massive run
Woods additionally stated the Korean market was extra inclined to a significant correction following its outsized rally.
Regardless of this week’s turmoil, the Kospi remains to be up greater than 20% in 2026 alone, and 100% over the previous 12 months. Against this, the S&P 500 is up a fraction in 2026 and 19% in contrast with a yr in the past.
“It’s earth-shattering while you see a 12% drop in an index in one of many larger nations on the planet,” Woods stated. However, “to me, what we’re seeing in these overseas markets are folks dashing for the exits as a result of they know they’ve a very good revenue, and the promoting is inflicting a little bit of a capitulation.”
Korea is the 14th largest economic system on the planet, in line with the Worldwide Financial Fund, bigger than Australia, the Netherlands and Saudi Arabia.
KOSPI vs. S&P 500, 1-year
Woods stated the Kospi’s transfer seems to be much like current declines in treasured metals and Peru’s market, which noticed main declines after monster runs.
Woods acknowledged the U.S. market has confronted important drawdowns in recent times tied to the Covid pandemic, the runup in rates of interest and inflation, and President Donald Trump’s tariffs.
However he famous these occurred over longer durations than the Korea’s two-day shock. Mizuho’s buying and selling desk advised shoppers that Korean shares entered a bear market — and it “solely took” three days.
Retail merchants’ position
A part of the selloff will also be defined by the prevalence of small traders in Korea.
The iShares MSCI South Korea ETF (EWY) “has gone from a retail darling to retail traders dashing for the exits,” VandaTrack analyst Viraj Patel wrote to shoppers.
The fund had seen a document, rolling one-month web circulate of $266 million from retail traders, eight-times the earlier excessive. The ETF noticed its highest-volume buying and selling day in historical past on Tuesday.
Hypothesis amongst merchants throughout the nation might additionally play a job. Korean traders have been piling into leveraged trades, betting on the nation’s market, Bloomberg reported.
