Retail Leverage Drives Global Market Volatility and South Korean Crash

Rising leverage among retail investors and quantitative funds is fueling higher volatility and short-term trading across global equity markets. This trend led to a severe market crash in South Korea during July 2026, where a sharp decline in memory-chip makers Samsung Electronics and SK Hynix triggered margin calls for over 1.2 million trading accounts.

In response to the instability, the Government of South Korea implemented new restrictions on leveraged ETFs and increased cash margin requirements to prevent future liquidations. The volatility also nearly caused the collapse of the hedge fund Situational Awareness, which had placed heavy leveraged bets.

Market strategists warn that similar risks now persist in the U.S. market, specifically within AI-related semiconductor and memory stocks. Analysts suggest that elevated leverage leaves these investors susceptible to further volatility if they are forced to reduce risk. Joe Saluzzi of Themis Trading described the South Korean event as a perfect example of how hyperactive day traders using derivative products can create a bubble.