Korea Exchange Triggers SIDECAR, Halts KOSPI Program Buying

A SIDECAR activation is a structural signal rather than a directional one: it says the exchange judged the pace of program-driven buying disorderly enough to pause it, not that fundamentals changed. The immediate effect falls on systematic and index-following strategies on the main board, which lose their automated entry channel for the duration. The open questions are what specifically tripped the threshold and how long the suspension runs — both undisclosed here, and both likely to shape whether the pause reads as a brief technical reset or something more persistent.