Korea Exchange Triggers SIDECAR, Halts KOSPI Program Trading

A SIDECAR halt is a telling signal that the exchange's own safeguards, not just price action, are now shaping the session: programmatic buy orders are off the table while the mechanism stays active, which can distort liquidity and widen spreads in the interim. The notable gap is disclosure — with no stated trigger or duration, market participants are left to infer whether this reflects a futures-led shock or a broader unwind. The open question is how quickly the exchange restores program orders and whether the underlying volatility that prompted the halt persists once it does.