South Korea's KOSPI crashes 8% triggering circuit breakers amid chip‑stock sell‑off

On July 7‑8 2026 the South Korean benchmark KOSPI fell more than 8 percent, activating the market’s circuit‑breaker mechanism and halting trading for about 20 minutes – the sixth such stop in the year. The sharp decline was driven by a rapid sell‑off in semiconductor giants Samsung Electronics and SK Hynix after both announced record‑breaking Q2 operating profit (an estimated 19‑fold year‑on‑year rise). The Ministry of Finance warned that “increasing concentration in the semiconductor sector has become a factor raising financial market volatility.”

The sell‑off spread to global markets: U.S. indexes saw the Nasdaq tumble over 1 percent, the Japanese Nikkei fell about 2 percent, and other Asian bourses (Hong Kong, Shanghai, Taiwan) posted losses. Traders highlighted the episode as a “proper AI stress test” for over‑leveraged semiconductor valuations. South Korean regulators and the finance ministry pledged close monitoring of market‑risk factors, including the surge in leveraged ETFs linked to chip stocks.

The episode also set a new domestic record for volatility‑interruption measures, with 29,357 VIs triggered in the first half of 2026 – the highest six‑month total on record – reflecting the extreme swings in chip‑driven equity prices.