A KOSPI rally lifted South Korea’s benchmark index 3.09% to a close of 5,638.34, as semiconductor shares advanced alongside stronger-than-expected third-quarter economic growth. The index had risen as much as nearly 5% during the session reported on October 27, 2026.

KOSPI rally led by semiconductor shares

SK Hynix gained 5.18% and Samsung Electronics rose 4.23%, both outpacing the broader index. Gains were not universal: Samsung Biologics fell 5.37%.

Foreign investors bought more than 593 billion Korean won, approximately $447 million, in the South Korean stock market. In the United States, the Philadelphia Semiconductor Index rose more than 2%.

GDP growth and AI optimism in focus

South Korea’s third-quarter GDP growth exceeded market expectations, supported by semiconductor exports and investment linked to the global artificial intelligence trend. The available figures did not specify the GDP growth rate.

The advance also coincided with optimism about US artificial intelligence companies and Anthropic’s initial public offering. Those developments provide market context, but the available information does not establish how much each contributed to the index’s rise.

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