Samsung and SK Hynix fell 6%, extending the AI-stock pullback as margin-style borrowing through bank overdraft accounts rose during the selloff.
South Korea’s KOSPI index hit a circuit breaker again on June 10 after Samsung and SK Hynix dropped 6%, in a sign that the pullback in AI-related stocks was still running. During the decline, balances in overdraft accounts at major commercial banks rose by more than 600 billion won, roughly $267 million, indicating retail investors were borrowing to buy into the selloff. Circuit breakers are market-wide trading curbs designed to slow sharp declines and contain panic selling.