KOSPI's Record 18% Rally Met With Record Retail Selling

The KOSPI surged 18% on July 31, 2026 — its largest single-day gain ever — driven by Samsung's 26.8% jump and SK Hynix's 30% circuit-limit rally on US tech earnings optimism. Yet individual investors sold a record 10.5 trillion won, the most on record, with institutional and foreign buyers absorbing the supply.