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BUSINESS · AUG 18, 2026

Seoul Stocks Fall as Trump Rejects Iran Agreement Extension

The Korea Composite Stock Price Index fell 1.55 percent Tuesday as investor anxiety grew over President Donald Trump's refusal to extend an agreement with Iran.

The benchmark Korea Composite Stock Price Index (KOSPI) ended a five-day winning streak on Tuesday, closing down 1.55 percent at 6,869.83. The market initially opened higher, with the index rising 2 percent driven by technology gains, before reversing course as investors locked in profits and reacted to geopolitical instability.

Donald Trump, President of the United States, fueled market anxiety by stating he was not interested in extending an expiring agreement with Iran. This declaration dampened hopes for a diplomatic resolution to the war between the United States and Iran, while simultaneously stoking inflation concerns through elevated oil prices.

Market leaders experienced mixed results. Samsung Electronics and Hyundai Motor Company saw significant declines, with Hyundai Motor falling 3.97 percent. In contrast, SK hynix and Samyang Foods recorded gains. Despite the equity market drop, the Korean won strengthened against the U.S. dollar, closing at 1,411.8 won.


Reported across 3 outlets
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Donald TrumpSamsung ElectronicsHyundai Motor CompanySK HynixGovernment of Iran

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