Single-stock leveraged products tied to Samsung Electronics and SK hynix suffered losses of about 35% to more than 53% between their May 27 listing and Sept. 23, far exceeding declines of 4.52% and 9.26% in the underlying shares. The gap reflects the negative compounding effect of products targeting twice each day’s return rather than twice the cumulative period return. Financial authorities raised the minimum cash deposit for single-stock leveraged and inverse products from 10 million won to 30 million won on July 31. Average daily turnover across 16 products fell about 92%, from 12.25 trillion won before the rule to 990 billion won afterward, while average holding periods rose from 2.3 days to 16.9 days. Retail investors became net sellers as foreign investors bought leveraged funds, but lawmakers and market experts warned that lower turnover does not by itself establish investor protection and that risk could migrate to products outside the rules.