The rally driven by the global artificial-intelligence boom has exposed structural vulnerabilities in a stock market unaccustomed to wild swings. | World News

The rally driven by the global artificial-intelligence boom has exposed structural vulnerabilities in a stock market unaccustomed to wild swings. | World News

South Korean stocks celebrated their best quarter in almost three decades, driven by a phenomenal surge in chipmakers. The KOSPI index soared, with tech giants Samsung Electronics…