In brief
On Nov. 6, 2026, Seoul’s KOSPI plunged over 8 percent, triggering a 20‑minute halt in trading. The decline was driven by fears that a Democratic sweep in the U.S. midterms could slow data‑center investment, by rising oil prices after Iranian attacks, and by sharp drops in major tech stocks such as Samsung and SK Hynix. The episode highlights the Korean market’s sensitivity to global shocks and raises concerns about market volatility and systemic risk.
On November 6, 2026, Seoul’s benchmark Korea Composite Stock Price Index (KOSPI) fell more than 8 percent during intraday trading, triggering a market‑wide circuit breaker that paused all trading for 20 minutes (Xinhua).
At 9:25 a.m., the KOSPI was down 460.33 points, or 8.55 percent, to 4,923.47, after an almost 2 percent drop right after the opening bell (Yonhap). The sudden sell‑off forced the bourse operator to suspend trading (Yonhap).
Investors blamed a Democratic sweep in the U.S. midterm election for dampening confidence in data‑center investment and AI‑related technology, which could slow the rapid build‑out of data centers in South Korea (Yonhap). At the same time, rising oil prices after Iranian forces said that at least five tankers had been damaged in the Strait of Hormuz added further pressure to markets (Yonhap).
Major companies were hit hard: Samsung Electronics fell 9.98 percent, SK Hynix dropped 11.63 percent, Hyundai Motor slid 6.47 percent, KB Financial lost 5.03 percent, and Hanwha Aerospace fell 4.56 percent (Yonhap). The Korean won was quoted at 1,357.4 won to the U.S. dollar, down 1.9 won from the previous session’s close (Yonhap).
Global markets mirrored the shock, with the Nasdaq dropping 5.52 percent and the S&P 500 falling 4.36 percent (Yonhap). The KOSPI’s sharp plunge and subsequent circuit breaker underscore the Korean equity market’s sensitivity to sudden international political and energy developments, and raise concerns about potential systemic risk (Xinhua).
