SK Hynix ADR trades at a 10% premium, as South Korean retail investors poured $45 billion into US stocks in July.

South Korean retail investors are shifting funds from their domestic stock market to the U.S. market. Data from the Korea Securities Depository shows that South Korean investors net bought around $4.5 billion in U.S. stocks in July, with approximately $840 million flowing into SK Hynix’s U.S.-listed American Depositary Receipts (ADRs), making it one of the most net-purchased U.S. securities by South Korean investors. Notably, South Korean investors could have directly bought SK Hynix shares in the domestic market but opted for its U.S. ADRs, leading to a notable price gap between the two markets. Currently, SK Hynix’s ADR trades at a roughly 10% premium to its domestic shares, with higher volatility for the U.S.-listed stock. Owen Lamont, senior vice president at Acadian Asset Management, notes that this rare price discrepancy may be a sign of excessive market speculation, even a "symptom of a bubble." The shift of South Korean retail investors to U.S. stocks has not reduced their risk appetite—AI, semiconductors, and high-leverage products remain core bets. Among the top 10 U.S. stocks net bought by South Korean investors in July, four were leveraged products, with the Direxion Daily Semiconductor Bull 3x ETF (SOXL) being the most popular. Meanwhile, South Korea’s stock market margin balance has fallen from around 37 trillion won at the end of June to about 27 trillion won by early August. Analysts point out that South Korean retail investors may have merely moved their high-risk AI trades originally conducted in the domestic market to the U.S. rather than exiting risk assets entirely. Industry experts believe that the scale of South Korean funds is insufficient to alter the overall trend of the U.S. stock market, but their concentrated trading could further amplify price volatility in high-volatility assets heavily favored by retail investors, such as AI chips, quantum computing, and leveraged ETFs.