South Korea tightens grip on high-risk ETFs as investor losses mount

South Korea’s financial authorities are weighing tighter curbs on high-risk leveraged exchange-traded funds (ETFs) as part of broader efforts to stabilise the country’s notoriously volatile stock market, which has left many investors with heavy losses and mounting debt.

The proposals could include giving regulators the power to reduce the leverage ratio of single-stock ETFs and raising the minimum investment requirement to discourage inexperienced retail investors from taking excessive risks,...