A Seoul Selloff Shook US Chip Stocks: How One Stock's Collapse Rippled Across Markets

SK Hynix shares fell 15% in Seoul on July 13, the worst day in company history, as investors cashed out after the Nasdaq listing. That Seoul rout directly triggered selling pressure across US chipmakers, tracked by the Philadelphia Semiconductor Index. It shows how a single massive foreign stock can now shift American sector sentiment instantly.