South Korea's Kospi posts its largest one-day jump on record, rebounding 14% after a three-day slide

South Korea's stock market staged its sharpest reversal on record on Friday, 31 July 2026. According to CNBC, citing LSEG data, the benchmark Kospi surged about 14%, its largest one-day jump ever, and closed the day at 6,373 points. SK Hynix also saw a record rebound, while Samsung Electronics soared.

The rebound followed a powerful overnight rally in U.S. technology stocks, driven by better than expected earnings from Microsoft, Amazon and Meta that reinforced expectations that spending on artificial intelligence infrastructure remains robust. Additional support came after SK Group Chairman Chey Tae-won disclosed purchases of SK Hynix shares, bolstering market confidence.

Jung In Yun of Fibonacci Asset Management said the day's move looked mainly like a violent reversal of an extremely crowded selloff and that he does not expect gains of this magnitude to continue. Despite the final-day jump, the Kospi ends July down about 23%.