On October 15, 2026, South Korea’s KOSPI index fell 7.57% to close at 5,554.22 points, its lowest finish since April. Samsung Electronics dropped about 9.5% and SK Hynix slid approximately 11%, deepening already significant declines from their respective peaks. The KOSPI has shed approximately 40% from its June 2026 peak of 9,386 points. The sell-off was severe enough to trigger circuit breakers multiple times, and pessimism extended to new listings, with AI firm Elice plunging 32% on its market debut. Higher-than-expected US inflation and disappointing revenue forecasts from major AI players including OpenAI and Anthropic fueled the sell-off.
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