A sharp selloff in South Korean AI stocks has reignited a debate over the systemic risks of leveraged exchange-traded funds. Heavy volatility in Samsung Electronics and SK Hynix triggered the Korea Exchange circuit breaker four times this year. Regulators now express regret over allowing single-stock leveraged ETFs, which may be amplifying market swings as retail enthusiasm for semiconductors cools.

These high-octane products have reached a massive scale, with total assets topping $290 billion. The US market alone exceeds $220 billion, while Asia's share has hit $45 billion. Strategists at Nomura estimate that these funds generate roughly $9 billion in rebalancing demand for every 1% market move, creating mechanical selling pressure during declines.

Barclays notes that US leveraged ETF rebalancing has averaged $20 billion daily over the last 10 sessions, four times the annual average. This creates a technical risk where the leverage itself drives price action regardless of fundamentals. In Korea, ETFs tracking chipmakers grew from $3 billion in May to over $9 billion as retail traders chased exceptional sector performance.

This mechanical rebalancing creates a feedback loop that accelerates price drops in fast-moving semiconductor stocks. Traders now monitor these flows alongside volatility-control funds to gauge market direction. The current structure transforms localized volatility into a global event that drags down European and US indexes.