South Korea's Korea Exchange triggers a sidecar mechanism as KOSPI 200 futures plunge 5%, suspending programme trading for five minutes.

The Korea Exchange activated a sidecar mechanism after KOSPI 200 futures fell 5%, triggering a five-minute suspension of programme trading in the cash market. Sidecars are volatility circuit breakers designed to interrupt the feedback loop between index futures and basket-based cash trades, so the halt transmits a liquidity-driven rather than fundamentals-driven shock, reducing the arbitrage-linked selling pressure that can otherwise cascade into spot equities. The KOSPI index and its constituent large-cap shares are most directly exposed, since they carry the heaviest weighting in both futures and programme-trade baskets, while the CHANGE tag signals the move is being tracked as a discrete exchange-level event rather than a macro repricing. Traders will watch whether programme-trading flows resume without renewed futures dislocation once the five-minute window closes, and whether the Korea Exchange lifts or extends restrictions, as persistent basis dislocation would point to broader deleveraging or foreign outflow pressure.

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