Korean Retail Investors Flee Domestic Market for U.S. Stocks

In July, South Korean retail investors dramatically redirected capital from their home market to U.S. equities. Korea Exchange data show that domestic stocks were net-sold for most of the week, even as the benchmark index entered bull-market territory, while overseas investors turned net buyers. The flow reversal coincided with a sharp sell-off in Korean semiconductor shares and leveraged exchange-traded funds (ETFs) that had previously driven a rally.

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• Korean investors net bought roughly $4.5 billion of U.S. stocks in July, a jump from June and close to the $5 billion net purchases recorded in January.

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• About $840 million of that amount went into SK Hynix’s U.S.–listed depositary receipts (ADRs), the second-largest ADR purchase despite the ability to buy the same shares domestically.

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• The SK Hynix ADRs traded at a ?10 % premium to the Korean-listed shares, according to senior vice president Owen Lamont of Acadian Asset Management.

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• Leveraged products featured prominently: the Direxion Daily Semiconductor Bull 3X Shares ETF (SOXL) was the most popular U.S. holding, while ProShares Ultra QQQ and ProShares UltraPro QQQ also ranked among the top ten.

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• Margin loan balances in the Korean market fell from 37 trillion won (~$26 billion) at the end of June to 27 trillion won earlier in July, the lowest level this year per the Korea Financial Investment Association.

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Owen Lamont described the surge in Korean purchases of SK Hynix ADRs as “absolutely crazy,” noting that buying domestic companies abroad creates price discrepancies that can signal speculative excess. Founder Jung In Yun of Fibonacci Asset Management added that traders hurt by losses in Korean semiconductor stocks or leveraged ETFs may be moving to U.S. AI stocks they view as higher-quality or more liquid, rather than abandoning the AI theme altogether.

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• “The irony is that if you parse the data and look at what they're buying, it's largely shares tied up in the same AI hardware theme that's been selling off in the local market,” — Phillip Wool, head of research at Rayliant Global Advisors

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The pattern suggests Korean retail investors are seeking liquidity and perceived stability in U.S. markets while maintaining exposure to AI-related semiconductor themes. Premium pricing on ADRs and heightened interest in leveraged ETFs could amplify volatility both in Korean and U.S. markets, especially if the underlying AI hardware sector experiences further turbulence. The decline in domestic margin borrowing also hints at reduced leverage among Korean participants, potentially tempering future sell-offs in the home market.

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