Korea Exchange Triggers SIDECAR, Halts KOSPI Program Trading

The SIDECAR firing is a mechanical, exchange-level response to downside pressure rather than a policy signal, but it matters because it temporarily removes a large slice of automated sell flow from KOSPI and can distort price discovery while active. Its relevance extends beyond Korean equities: program-trading curbs are a recurring marker of stress in a market that has become a bellwether for retail-heavy, leveraged trading. With the exchange disclosing neither the trigger threshold nor the duration, the open question is how quickly normal program selling resumes and whether the underlying pressure persists once the halt lifts.