South Korean stocks staged a powerful comeback on Wednesday, with the benchmark KOSPI index surging 4.7% to erase most of the losses from a two-day selloff. The rebound was led by Samsung Electronics, which reassured investors that demand for artificial intelligence chips remains strong and that supply is likely to stay constrained.
The move highlights how quickly sentiment can shift in a market heavily influenced by a handful of heavyweight technology stocks. Just days earlier, the KOSPI had tumbled as global risk appetite soured, but Samsung's upbeat assessment on AI-related chip demand was enough to flip the mood.
Samsung's AI chip outlook drives the rally
Samsung Electronics, the country's largest company by market value, said that demand for memory chips used in AI servers continues to look robust and that supply should remain tight. That's a significant signal for investors because memory chips tied to AI data centers have become a key driver of South Korea's corporate profits and export growth. Tight supply typically supports pricing power, which can boost margins for chipmakers.
The upbeat tone also lifted other semiconductor stocks, including SK Hynix, a major producer of high-bandwidth memory chips used in AI systems. The rally spread to other large-cap names, suggesting the move was broad-based rather than confined to a single sector.
This is not the first time Samsung's AI-related commentary has moved markets. Earlier this year, the company reported a 19-fold profit surge driven by AI chip demand, even as its mobile business faced headwinds. That pattern — AI strength offsetting weakness elsewhere — has become a recurring theme for the company and for South Korea's export-driven economy.
Regulators tighten rules on leveraged ETFs
Alongside the market rebound, South Korean financial regulators announced tighter restrictions on single-stock leveraged exchange-traded funds (ETFs). These are funds that use debt to amplify the daily returns of a single stock, often by two or three times. While they can boost gains in a rising market, they also magnify losses and can contribute to volatility.
The new curbs are aimed at reducing speculative trading and protecting retail investors, who have increasingly piled into these high-risk products. The move echoes similar actions by regulators in other markets, such as the U.S. and China, where authorities have periodically tightened rules on leveraged ETFs to cool excessive speculation.
For everyday investors, the rule change means that trading in single-stock leveraged ETFs will become more restricted, potentially reducing the tools available for short-term bets. However, it may also help dampen extreme price swings in individual stocks, which can be triggered by large flows into these funds.
What it means for investors
The KOSPI's sharp rebound is a reminder of how sensitive South Korean stocks are to developments in the global AI supply chain. With Samsung and SK Hynix accounting for a large share of the index's weight, any news about chip demand or supply can have an outsized impact on the broader market.
For investors with exposure to South Korean equities — either directly or through ETFs — the key takeaway is that AI-related demand remains a powerful tailwind for the country's largest companies. However, the recent two-day selloff also shows how quickly sentiment can reverse when broader market conditions turn risk-off, as seen in the S&P 500 hitting a one-month low amid Fed rate decisions and AI stock slumps.
The new leveraged ETF restrictions may reduce some of the speculative froth in individual stocks, but they are unlikely to change the fundamental picture for chipmakers. Investors should continue to watch for updates on AI spending from major tech companies, as well as any shifts in global trade policy that could affect South Korea's export outlook.
Overall, the bounce-back underscores that while volatility can spike, the underlying demand for AI chips — and South Korea's role in supplying them — remains a central theme for markets in 2025.
