Bank of Korea Warns Single-Stock Leveraged ETFs on Samsung and SK Hynix Will Intensify Market Concentration

The BOK submitted its assessment in response to a written query from People Power Party lawmaker Park Sung-hoon, noting that further inflows into these products would amplify one-way trading flows and volatility. This follows documented patterns where Korea’s equity market capitalization has remained above 50 percent concentrated in semiconductors since 2023, per Korea Exchange data releases. Retail participation in leveraged single-stock products has grown rapidly since their 2024 regulatory approval, mirroring earlier spikes in volatility during the 2022 and 2025 rate cycles.

Primary records from the Financial Supervisory Service show single-stock ETF assets under management rose from 1.2 trillion won in late 2024 to over 4.8 trillion won by mid-2026, with Samsung and SK Hynix products capturing the majority. The BOK’s position aligns with its prior 2023 stability reports that flagged retail leverage as a transmission channel for external semiconductor demand shocks. No equivalent warnings have been issued for broad-market leveraged ETFs.

The warning arrives as global semiconductor cycles enter a potential downturn phase, with Taiwan and U.S. listed peers showing correlated drawdowns exceeding 15 percent in the prior quarter. South Korean authorities have so far maintained product approvals while monitoring margin debt levels at brokerages. Any tightening would require legislative change to existing capital markets rules.

Regulators face the choice between containing retail leverage or preserving product access that has drawn domestic flows away from offshore platforms. Historical episodes in Japan and Taiwan indicate that concentration warnings alone rarely reverse product uptake without direct position limits.