South Korean stocks fell more than 5% on October 30, 2026, as semiconductor shares dropped following losses in US technology stocks. The KOSPI was down 314.58 points, or 5.3%, at 5,623.08 as of 0217 GMT.

Key Takeaways

  • Samsung Electronics fell 5.93% and SK Hynix dropped 8.58%.
  • A sidecar trading curb was triggered during the session, temporarily restricting program trading for five minutes.
  • The KOSPI had lost about 18% in October and was on course to end the month lower after two months of gains.

South Korean stocks follow US technology losses

The decline followed a sharp fall on Wall Street on October 29, when investors were assessing major technology companies’ artificial intelligence spending alongside corporate earnings and inflation data. The timing does not establish a single cause for the Korean market’s decline.

Selling extended beyond chipmakers. Hyundai Motor fell 3.59%, Kia declined 3.51% and POSCO Holdings slipped 1.45%. LG Energy Solution rose 0.35%, while Samsung Biologics gained 4.10%.

Of 908 traded issues, 749 declined and 138 advanced. Foreign investors were net sellers of South Korean shares worth 844.9 billion won, equivalent to $630.94 million.

Five-minute trading curb

The session’s volatility triggered a sidecar, temporarily restricting program trading for five minutes. The Korea Exchange’s explanation of the sidecar mechanism describes how temporary restrictions on program-trading orders are used when futures prices move sharply.

Won and bond yields

The won traded at 1,337.8 per US dollar on the onshore settlement platform, strengthening 0.13% from its previous close of 1,339.5.

The three-year Korean government bond yield fell 3.4 basis points to 3.734%, while the 10-year yield declined 7 basis points to 4.030%. December futures on three-year Korean Treasury bonds rose 0.09 points to 103.42.

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