Investors are increasingly seeking protection against a potential downturn in South Korean equities, as the country's stock market rally shows signs of overheating. The benchmark Kospi index has surged roughly 18% since the start of 2025, propelled by a relentless rally in semiconductor and artificial intelligence stocks. However, the rapid ascent has triggered a spike in demand for hedging instruments, with trading volumes in put options — contracts that profit from a decline in share prices — climbing sharply over the past two weeks.
According to market data, the Kospi closed at 2,845 on Tuesday, up 0.6% on the day, but remains within striking distance of its all-time high of 2,890 set in 2021. The rally has been led by heavyweight chipmakers such as Samsung Electronics and SK Hynix, which have benefited from the global AI boom. Yet some analysts argue that valuations have become stretched, with the Kospi's forward price-to-earnings ratio now sitting at 13.5, above its five-year average of 11.8.
“We are seeing a classic case of market euphoria meeting caution,” said Dr. Min-ji Park, a Seoul-based equity strategist at Hanwha Investment & Securities. “The momentum is undeniable, but the risk of a sharp correction is rising. Investors are buying protection not because they expect an immediate crash, but because the asymmetry of risk is now tilted to the downside.” Park noted that options implied volatility has risen 12% in the past month, a sign that traders are pricing in larger swings ahead.
For UK investors with exposure to Asian markets through exchange-traded funds or pension funds, the situation warrants attention. Many British pension schemes hold allocations to South Korean equities as part of their emerging market or Asia-Pacific mandates. A sharp pullback in Seoul could drag on returns, particularly if the correction coincides with weakness in other major Asian bourses. The FTSE 100, by contrast, has remained relatively stable, trading at 7,920 on Wednesday, up 0.3%.
The Bank of Korea has also sounded a note of caution, with Governor Rhee Chang-yong recently warning that asset prices may have run ahead of fundamentals. While the central bank has kept its benchmark interest rate at 3.50%, it has signalled that any further tightening would depend on financial stability risks. Analysts suggest that a 5-10% correction in the Kospi would not be out of the ordinary and could even be healthy, allowing valuations to reset without derailing the broader growth story.
Source: Hanwha Investment & Securities, Bank of Korea