South Korea's stock market handed its investors a rollercoaster in 2026 that reads like an edge-of-the-seat drama. Early in the year, while markets across the world were under pressure, the KOSPI kept leaping higher. Within a short span, South Korea became the highest-returning stock market on the planet. But as June drew to a close, the entire picture flipped, and in under a month the KOSPI tumbled by more than 30 percent.
The opening rally was so powerful that it set records. By the end of June, the KOSPI had clocked growth of roughly 110 percent. Investors had begun to feel that a flood of money was about to reach them. It was precisely at that moment that pressure from the international market and the world's geopolitical situation began to weigh on the index. As soon as July began, the KOSPI started sliding steadily, and the fall got so severe that a lower circuit forced trading to be halted.
How Steep Was the Fall
July 13 proved to be the worst day for the market, when the KOSPI dropped as much as 9 percent in a single session. The heavy fall triggered a lower circuit and trading had to be stopped. Just before that, on July 8, the market had already sunk more than 5 percent. So far in July the KOSPI has recorded a decline of around 30 percent. Even so, one striking fact stands out: right up to the end of the first fortnight, the KOSPI's return compared with last year remains above 60 percent. That is why, even after such a fall, the KOSPI is still the highest-returning market in the world today.
What Drove the Rally
Several solid reasons lay behind this market's historic climb. In June, a powerful AI boom sent demand for semiconductor companies soaring, and a Korean giant like Samsung directly benefited. On the back of this fierce demand for chips, shares of companies such as Samsung and SK Hynix jumped sharply. On top of that, corporate governance reforms in South Korea strengthened investor confidence, giving the market a further push upward.
The Main Reasons Behind the Slide
- China's DeepSeek announced that it would build the chips it needs on its own. That decision piled pressure on Korean chip companies and sent the KOSPI sharply lower.
- Because of the same pressure on the chip market, aggressive profit-booking broke out in AI and chip stocks.
- In June, companies like Samsung and SK Hynix were pulling in heavy investment, but in July they faced constant pressure, and a wave of selling dragged the whole index down.
- Tension is once again deepening in the Middle East, with Iran and America drawn back into war, and the impact on the KOSPI is clearly visible.
- Worries over interest rates and inflation in the US market persist as well, and that has directly pressured the Korean market.
A Market That Slid Into Bear Territory
At one point in June, South Korea's stock market touched a record high of 9,114.55 points. It is currently trading around 30 percent below that level. With this heavy fall, the KOSPI has now entered bear-market territory, a zone of sustained decline. Analysts say the drop has wiped out roughly 1,700 trillion won, or 1.25 trillion dollars, from the KOSPI's market capitalization. In Indian currency, that amount works out to nearly 120 lakh crore rupees.
