'Absolutely crazy': Here's what South Korean stock investors are doing in U.S. markets

• Korean investors purchased $840 million in SK Hynix U.S. depositary receipts despite the stock being available domestically, with ADRs trading at a premium—a pattern analysts call 'absolutely crazy' and reminiscent of dot-com bubble speculation
• Four of the 10 most purchased U.S. securities in July were leveraged products, including the Direxion Daily Semiconductor Bull 3X ETF, as investors amplify bets on the same AI and semiconductor themes they held in Korea
• Margin loan balances in Korean markets plunged from 37 trillion won ($26 billion) in June to 27 trillion won in early August as investors redirected capital to U.S. markets during the domestic correction

Summary: South Korean Retail Investors Surge into U.S. Markets

South Korean retail investors net purchased $4.5 billion in U.S. stocks during July, marking a significant shift from their domestic market even as Korea's benchmark index entered bull territory. This represents a sharp increase from June and approaches the $5 billion purchased in January.

Key Investment Patterns

Korean investors are primarily maintaining their AI and semiconductor exposure through U.S.-listed securities rather than changing investment strategies. Approximately $840 million of July's purchases went into SK Hynix's U.S.-listed depositary receipts (ADRs), despite the stock being available domestically. Notably, these ADRs have traded at a premium to Korean shares—a price discrepancy that analyst Owen Lamont calls "absolutely crazy" and potentially symptomatic of speculative excess, drawing comparisons to dot-com era dislocations.

Leveraged Product Appetite

Four of the ten most net-purchased U.S. securities in July were leveraged products, with the Direxion Daily Semiconductor Bull 3X ETF being the most popular. This continued into August, with leveraged products remaining among top choices.

Market Context

Korean margin loan balances plummeted from approximately 37 trillion won ($26 billion) in late June to 27 trillion won in early August—the lowest level this year—suggesting investors are deleveraging domestic positions while increasing U.S. exposure.

Market Impact

While Korean flows are unlikely to significantly impact broad U.S. markets given their size relative to overall trading volume, analysts warn they could amplify volatility in individual stocks and niche sectors favored by retail traders, particularly leveraged ETFs and specific semiconductor names.