The Korea Exchange just activated a circuit breaker at 10:13am after $KOSPI crashed over 8%, halting trading for 20 minutes. Samsung fell 9.45%, SK Hynix fell 11.01%.

Here's what actually makes today different from the seven prior halts this year:
The exchange has now logged close to 30 sidecar activations and roughly 8 to 9 circuit breakers in 2026 alone, both already surpassing the $KOSPI's entire prior annual record set in 2008 during the global financial crisis. That record stood for 18 years. It just got broken with five months still left in 2026.
The mechanism hasn't changed since the first halt back in June. Samsung and SK Hynix together make up roughly half the index's total weight, so every double-digit move in either one drags the whole benchmark down disproportionately.
Today's trigger traces to China's CXMT raising $8.6 billion and expanding DRAM capacity, reviving fears that Korea's memory pricing edge won't hold as long as the market assumed.
The part that should actually worry you isn't the equity chart, it's the won. USD/KRW barely moved, up about 0.1%, while $KOSPI fell over 9%. That gap means this is concentrated equity selling, not a currency panic yet. If that decoupling breaks and the won starts confirming what the stock market is pricing, that's a different, harder problem for the Bank of Korea to manage.
The index that was up 75% in 2025 and another 50% earlier this year is now down roughly 27% from its June 19 peak, sitting below even Goldman's stress-tested worst case scenario.
Either the market is pricing in a downturn deeper than anything since 2008, or a significant amount of bad news is already baked in and this is closer to capitulation than continuation.