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Kospi's 33% Slide Exposes South Korea's Retail Leverage

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Kospi's 33% Slide Exposes South Korea's Retail Leverage

2026-08-04 09:30 UTCBy AlphaScala Research DeskSource reporting: businessinsider.comEditorial standards

Kospi's 33% Slide Exposes South Korea's Retail Leverage

The Kospi's 33% decline from its June high has triggered a cascade of forced selling among leveraged retail investors, prompting regulators to curb leveraged ETFs and raising concerns about household debt.

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South Korea's Kospi index has lost roughly a third of its value since hitting a record high in June. The sell-off wiped out much of the year's AI-driven gains and exposed a wave of leveraged retail investors to steep losses.

The index ended July down 22% from a month earlier after a series of daily swings that triggered market-wide circuit breakers four times, according to a Business Insider report. Forced selling by investors who had borrowed money to buy stocks accelerated the decline.

The rally earlier this year had been concentrated in two memory chipmakers: Samsung Electronics and SK Hynix. Both hit record highs on AI optimism. The reversal hit harder because the broader index had become so dependent on those two stocks, the report said.

Investors who piled into single-stock leveraged exchange-traded funds found themselves on the wrong side of amplified bets. South Korean regulators temporarily suspended new listings of such leveraged ETFs, banned financial firms from advertising them, and raised the minimum cash deposit required for retail investors.

South Korea's households are among the most indebted in the developed world. The AI rally drew in many retail investors using borrowed money. Young South Koreans took to TikTok and Instagram to share screenshots of their battered portfolios, often with self-deprecating humor. One user posted a video of herself eating convenience-store instant ramen, with an on-screen graphic showing her investments down more than 68%. Another danced to Jason Mraz's "I'm Yours" while a video cycled through losses on her Samsung and SK Hynix holdings.

The memes were a coping mechanism, but the losses were real. The Kospi's decline from its June peak erased most of the gains from a blistering first-half rally that had made South Korea one of the world's best-performing stock markets.

The risk of further forced selling depends on whether the Kospi stabilises. The regulator's intervention on leveraged products could slow the bleeding, but the broader vulnerability remains as long as retail investors are exposed to margin calls. A continued decline in Samsung Electronics and SK Hynix would deepen the losses, as the index's heavy concentration in those two stocks amplifies the downturn. Forced selling by margin investors could accelerate the drop.

The products themselves are a new source of risk. South Korea's single-stock leveraged ETFs let investors make amplified bets on companies such as Samsung Electronics and SK Hynix. Regulators, concerned that the products were fueling speculation, acted to curb them. The temporary suspension of new listings, the advertising ban, and the higher cash deposit requirement are all aimed at limiting retail exposure.

Still, the broader concern is the household debt load. South Korea's household debt-to-GDP ratio is among the highest in the developed world. Many of the investors who piled into stocks during the rally used borrowed money. When the market turned, margin calls forced them to sell, which deepened the sell-off.

The social media posts provided a window into the pain. One Instagram user posted a video of himself shouting dramatically as losses across his holdings in Samsung Electronics and LG Innotek scrolled on screen. The caption said he wanted to run away from Korean stocks. Another user joked that she could forgive meme coins for falling, but didn't expect blue-chip stocks to let her down.

The Kospi's decline from its June peak to late July was one of the most turbulent months in its history. The index had more than doubled from the start of the year before the reversal. The forced selling by leveraged investors turned a correction into a rout.

What would reduce the risk? Stabilisation of the index, particularly if Samsung and SK Hynix find a floor. The regulatory measures could also help by reducing the availability of leveraged products. What would make it worse? A further decline in the two chip stocks, which would trigger more margin calls and more forced selling. The concentration risk is the key vulnerability.