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South Korea's KOSPI Surges 5% to 5,925 as Samsung and SK Hynix Lead Record Institutional Buying Amid AI Memory Boom

South Korea's benchmark KOSPI index surged more than 5% on Wednesday, closing at 5,925.03 on record institutional net buying of 3.1 trillion won — the single largest institutional buy day in the exchange's history. Semiconductor giants Samsung Electronics and SK Hynix led the rally, reclaiming key psychological price levels at 200,000 won and 1 million won respectively, as investors positioned ahead of Micron Technology's blockbuster earnings expected after the U.S. close.