South Korea's benchmark KOSPI index dropped 2.25% to 8,285.36 on Tuesday, as foreign investors locked in gains in the country's biggest semiconductor stocks. The pullback came even as export data beat expectations, driven by record sales of AI-linked chips.
The selling was concentrated in the index's heaviest weights: Samsung Electronics fell 4.34% and SK Hynix dropped 3.62%. Overseas investors were net sellers of 1.1 trillion won ($706 million) on the day, according to exchange data.
Record exports overshadowed by profit-taking
South Korea's export figures for June surprised to the upside, with semiconductor shipments hitting an all-time high thanks to surging demand for artificial intelligence computing. The data pointed to continued strength in the country's export-driven economy, which has benefited from the global AI boom.
But the positive trade numbers were not enough to keep the market in positive territory. The KOSPI had rallied sharply in recent months — Reuters noted the index jumped 68% in the June quarter alone — making it vulnerable to a pullback as investors reassess valuations.
Kiwoom Securities, one of South Korea's largest brokerages, pointed out that foreign investors' share of KOSPI market value has actually risen to 40% from 35% since the start of the year. That may seem counterintuitive given that foreigners were net sellers of a record 148 trillion won in the first half. But when prices rise faster than positions shrink, foreign ownership can look larger on paper — making the market more sensitive if those same funds keep trimming.
Currency impact adds another layer
The won weakened to about 1,557.8 per dollar, a reminder that equity outflows can spill into the currency when global investors hedge or repatriate cash. A softer won can be a double-edged sword: it helps exporters like Samsung by making their goods cheaper abroad, but it also raises import costs and can fuel inflation.
For everyday investors, the key takeaway is that South Korea's market is increasingly tied to global capital flows. When foreign ownership is concentrated in the largest index heavyweights, any risk-reduction tends to hit those stocks first because they're the most liquid. That can turn routine profit-taking into an outsized index move, even if the fundamentals — like exports — still look strong.
This dynamic is not unique to South Korea. Similar patterns have played out in other Asian markets where foreign investors hold large stakes. For context, see how Indian stocks have been capped by foreign selling despite positive economic data.
What it means for investors
For those with exposure to South Korean stocks, the selloff is a reminder that even strong fundamentals can be overshadowed by technical factors like foreign selling. The chip sector remains the engine of the Korean economy, but its heavy weighting in the KOSPI means that any rotation out of tech can hit the index hard.
Investors should also watch the won. If foreign selling continues, the currency could weaken further, which would have knock-on effects for anyone holding Korean assets or investing in Korean companies through exchange-traded funds (ETFs).
The broader backdrop remains supportive for semiconductors, with AI spending driving demand. But as the STOXX 600's AI-led rally showed, tech stocks can be volatile when sentiment shifts. For now, the KOSPI's pullback looks like profit-taking rather than a fundamental reversal, but the high foreign ownership stake means the market could remain choppy.
South Korea's factory sector has also shown signs of slowing, as noted in June's factory growth data, which showed export orders dipping. That adds another layer of uncertainty for investors watching the chip cycle.
In the near term, all eyes will be on whether foreign selling continues or stabilizes. If the export data remains strong and AI demand holds up, the KOSPI could find support. But with a 40% foreign stake in the market, any shift in global risk appetite will hit Seoul first.
