'I couldn't breathe': South Korea's frenzied stock trading exposes margin loan risks

• Lee turned 20 million won into a 15-fold gain before losing it all when the volatile Kospi index plunged more than 10% multiple times in weeks, triggering forced liquidations
• Total investor debt in South Korea's stock market exceeded 60 trillion won in May 2026, coinciding with the $4.1 trillion market becoming the world's most volatile
• Regulators banned new leveraged ETFs on individual stocks just months after approving them, with officials acknowledging the products were 'approved too hastily' as a 'policy error'

Summary

Key Development: South Korean retail investors' use of extreme leverage has reached alarming levels, prompting regulatory intervention. University student Lee Seung-ho exemplifies the trend, building a 300 million won ($202,515) fortune from 20 million won using a 500% margin loan before losing it all in four weeks during May market volatility.

Critical Figures:

• Margin loan balances hit record 38.63 trillion won on June 24; stood at 34.37 trillion won as of July 15
• Total investor debt exceeded 60 trillion won by end-May
• South Korea's $4.1 trillion stock market recently doubled in six months before experiencing multiple 10%+ plunges
• Seoul apartment prices average 14 years' salary, driving young investors toward high-risk strategies

Regulatory Response: Authorities announced a ban on new listings of leveraged ETFs tied to individual stocks, with the Financial Supervisory Service acknowledging the products were "approved too hastily" in a "policy error correction."

Market Context: The Kospi recently ranked as the world's best-performing index before experiencing violent swings and forced liquidations. Easy access to 5x leverage through mobile apps has created a "deeply leveraged retail investing culture" that regulators view as increasingly dangerous.

Investor Behavior: Despite devastating losses, Lee and many young South Koreans remain committed to leveraged trading, viewing it as their only path to wealth accumulation amid prohibitive housing costs. The high-risk trading culture reflects broader economic pressures facing young graduates locked out of traditional wealth-building opportunities.

Expert Analysis: Market strategists warn that leverage "accelerates losses on the downside far faster than it builds wealth on the upside" in volatile markets, creating asymmetric risk for retail investors.