KOSPI Rebounds 0.97% as Leveraged ETF Outflows Ease Chip Volatility

South Korea’s benchmark KOSPI index rose 0.97% to close at 6,808 on August 26, 2026, as semiconductor stocks advanced and falling oil prices eased inflation pressures. Samsung Electronics gained 1.95% and SK Hynix rose 0.72%, buoyed by overnight strength in US chip stocks. The rebound offers relief after leveraged ETF products tied to these two companies suffered nearly $1 billion in August outflows, marking the first monthly net withdrawal since their May launch.

How leverage turned a correction into a crash

In May 2026, South Korea approved single-stock leveraged ETFs tied to Samsung and SK Hynix, designed to track twice the daily moves of each stock. Retail investors, who drive 60 to 70% of exchange volume, poured an estimated $54 billion into these products within two months. When chip stocks fell 20 to 30% in June on AI demand concerns, the leveraged ETFs doubled those losses instantly. Over six weeks, the KOSPI fell nearly 40%, erasing roughly $2.5 trillion in market value and hitting hundreds of thousands of retail investors with historic losses.

August outflows signal retreat from leveraged bets

SK Hynix-linked leveraged ETFs lost roughly $601 million in August, while Samsung-linked funds saw about $381 million exit, putting them on course for their first monthly net withdrawal since launch. The reversal is striking because these products were introduced at the height of South Korea’s AI boom. The central question is whether investors have turned bearish on Samsung and SK Hynix, or are simply retreating from one of the most aggressive ways to bet on semiconductors.

Oil price relief and Nvidia earnings drive sentiment

Brent crude fell 5.60% to $87.01 on August 25 as tensions between the United States and Iran eased, pushing down inflation expectations and supporting stock prices globally. Lower energy costs reduce South Korea’s import pressures, a significant benefit for the import-dependent economy. Investors remained cautious ahead of Nvidia’s earnings report, which could influence the broader AI and semiconductor sector and potentially stabilize or destabilize leveraged chip bets.

The leverage lesson for retail investors

South Korea lost $2.5 trillion in six weeks, but the real lesson is leverage, not Korea. The Financial Services Commission had warned before launch that single-stock concentration combined with leverage could produce significantly larger losses than conventional ETFs. Retail investors who borrowed to buy leveraged products faced margin calls and forced sales at the worst moments, amplifying the crash. The August outflows suggest many have learned this lesson the hard way.

Final Thoughts

The KOSPI’s 0.97% rebound on August 26 reflects easing oil prices and chip sector strength, but underlying volatility remains high. Leveraged ETF outflows signal that retail investors are finally retreating from the most aggressive bets, a necessary correction after $2.5 trillion in losses.

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