Kospi Plunges Over 40% From June Peak as Chip Duo Drags Index Into Crash

On July 28–29, 2026, South Korea's Kospi fell over 40% from its June peak — dropping nearly 11% then as much as 12.6%. SK Hynix and Samsung, jointly over half the index's market cap, slid 13–16%+. SK Hynix's record Q2 earnings missed estimates and offered no forward catalysts. The concentration turned a single-stock shock into a systemic rout.