Trading in South Korea’s single-stock leveraged ETFs slumped 89% within two weeks of a higher margin requirement taking effect, but a report released Aug. 19 by the National Assembly Research Service said the decline should not be read as proof that investor protection has worked.
The report said lower turnover does not mean investors have fully understood the risks of these products, and it does not automatically mean losses will shrink. It warned that if entry restrictions become too strict, speculative demand could shift into overseas leveraged products that face lighter regulation.
Margin requirement tripled under emergency measures
The report focused on emergency steps approved by South Korea’s finance ministry on July 29 and put into effect on July 31. Under those measures, the minimum margin requirement for single-stock leveraged and inverse ETFs was raised from 10 million won, or about $7,110, to 30 million won.
The market reaction was immediate. From May 27 to July 30, the average daily trading value of 16 single-stock leveraged and inverse ETFs stood at about 11.7 trillion won. From July 31 to Aug. 10, after the higher threshold took effect, that figure fell 89% to 1.3 trillion won.
Report challenges the idea that lower trading equals better protection
South Korean authorities had treated the collapse in trading as evidence that the clampdown was working. The National Assembly Research Service took a different view. In its report, it said a drop in turnover does not show that investors genuinely understand product risk, and it does not mean investor losses have been reduced.
It also said excessive access controls could redirect speculative activity rather than remove it. In that case, demand that once sat inside the domestic market could migrate to offshore leveraged instruments outside the reach of Korean regulators.
The products under discussion are single-stock leveraged ETFs tied to names including Samsung Electronics and SK Hynix. The report’s argument was that changes in local turnover alone may miss the larger question of whether the risk has simply moved elsewhere.
Heavy early trading came with rising market volatility
When the products debuted in May, first-day trading value reached 10.4 trillion won, accounting for 27% of total ETF turnover that day. Over roughly the same stretch, daily return volatility in the KOSPI rose from 1.4% last year to 3.6% in the first half of this year. It moved above 4% twice, in March and June, exceeding levels seen in the early phase of the COVID-19 outbreak.
The research service pointed to the rebalancing mechanics of leveraged products. To maintain target leverage, such ETFs must buy or sell the underlying stocks each day. As assets grow, the rebalancing flow itself can amplify price swings in shares such as Samsung Electronics and SK Hynix, creating a feedback loop between ETF trading and moves in the underlying stocks.
Market swings were not pinned solely on leveraged ETFs
The report did not assign all recent market volatility to leveraged ETFs. It said uncertainty in the global semiconductor industry should also be taken into account, and warned against reducing a complex market move to a single cause for policy purposes.
Hong Kong’s variable leverage model was cited as a reference
As a possible policy reference, the report cited Hong Kong’s variable leverage mechanism introduced last month. Under that framework, issuers are allowed to adjust the next trading day’s target leverage ratio within a maximum leverage cap, depending on market conditions.
If leverage is lowered, the scale of rebalancing trades also shrinks, reducing the effect on the underlying stock market. The report presented that approach as an alternative to a blanket tightening of entry requirements.
South Korea is also moving on legal and education measures
South Korea is pursuing additional domestic measures. On Aug. 11, an amendment to the capital markets law was submitted to the National Assembly. The proposal would authorize financial regulators to adjust the risk grade of leveraged products on an emergency basis during periods of sharp market turbulence.
The National Assembly Research Service said that if such emergency authority is institutionalized, the trigger threshold, scope of application, and the method for notifying existing investors should all be clearly defined in advance. Otherwise, the power itself could become a fresh source of uncertainty.
On the investor education side, new investors must complete simulated trading before buying single-stock leveraged products starting Aug. 19. The purpose is to make them understand risk features including daily return tracking structures and negative compounding effects.
Key question is where the risk goes
The report called for continued monitoring of current measures, along with clearer standards and tools for risk response so authorities can act quickly when risk rises. Its central point was that raising the margin threshold from 10 million won to 30 million won may block some retail access, but it does not erase speculative demand itself.
The more important issue, according to the report, is not only how much trading has fallen, but where the risk has moved. If the answer is overseas markets and leveraged products outside direct domestic oversight, then the apparent success of the higher threshold may exist mainly in the local trading data.