Here’s a paradox worth sitting with: South Korean stocks have been among the best-performing equities on the planet in the first half of 2026, and foreign investors have been sprinting for the exits anyway.

Over $100 billion in foreign capital left South Korean equities in the first six months of the year. June alone accounted for $30 billion of that figure. The KOSPI index, meanwhile, nearly doubled during the same period.

Who’s selling, and how much

Mutual funds offloaded $7.5 billion worth of South Korean equities in June alone. Pension funds followed with $4.35 billion in sales. Hedge funds added another $1.87 billion to the pile. The primary targets were Samsung Electronics and SK Hynix, two companies that sit at the center of the global semiconductor supply chain and have benefited enormously from AI-related demand.

Domestic retail investors filled the gap

Someone had to absorb all that selling, and in South Korea’s case, it was local retail traders.

The resulting volatility has been extraordinary. Trading circuit breakers, the automatic pause mechanisms designed to cool frenzied markets, were triggered a record 29,357 times during the first half of 2026. Local analysts have openly described the current market environment as a “casino.”

The math on potential further outflows is uncomfortable

Foreign investors currently own approximately 39.5% of South Korean equities. Analysts have identified 35% as a meaningful threshold. If foreign ownership declines to that level, the implied additional selling pressure reaches approximately 260 trillion won, equivalent to roughly $170 billion.

The South Korean market has long carried what investors call a “Korea discount,” a structural undervaluation relative to global peers, attributed to factors including corporate governance concerns, geopolitical proximity to North Korea, and historically complex shareholder return policies.

What this means for markets beyond Korea

South Korea’s semiconductor sector is not a regional story. Samsung and SK Hynix supply memory chips to virtually every major AI infrastructure buildout happening globally.

Foreign ownership of South Korean equities sitting at 39.5% with a potential $170 billion overhang in further sales is the kind of structural pressure that doesn’t resolve quietly. Whether domestic retail demand can continue absorbing institutional selling at this scale, while circuit breakers fire thousands of times a week, is the central question for anyone with exposure to Korean equities or the semiconductor names that underpin the global AI trade.