Retail curbs expose Korea’s high-speed trading gap

The Kospi remains vulnerable to sharp swings despite new deposit rules for single-stock leveraged products, as foreign high-frequency trading around Samsung Electronics and SK hynix exposes the limits of curbs focused primarily on retail investors. Trading value in the five largest single-stock leveraged products by market capitalization plunged 74 percent Friday, the first day the new rules took effect, according to the Korea Exchange. Retail investors sold a net 1 trillion won ($700 million) w