[Edaily Reporter PARK MIN ] The domestic stock market opened higher on the 29th, rebounding from the previous day’s sharp decline, but it has been unable to avoid a steep drop as both the SamsungElectronics(005930)and SK hynix(000660)turned lower. The KOSPI and KOSDAQ markets each broke through the 6,000 and 700 levels—considered psychological support lines—during the session, triggering sell-side circuit breakers.

According to MP Doctor, as of 11:10 a.m. that day, the KOSPI stood at 5,710.07, down 313.59 points (5.21%) from the previous trading day. The index opened higher, rising as high as 6,228.52 during the session, but volatility widened significantly as selling pressure intensified sharply, pushing the index down to 5,673.33.
At the same time, the KOSDAQ index stood at 667.08, down 38.77 points (5.49%) from the previous trading day. The index rose as high as 719.39 early in the session but subsequently fell to 663.37 during the session as selling pressure intensified sharply.
According to the Korea Exchange, a sell-side sidecar was triggered in the KOSPI market at 10:55:07 a.m. today. Subsequently, at 10:56:07 a.m., a sell-side sidecar was also triggered in the KOSDAQ market.
A sell-side sidecar is a mechanism designed to mitigate volatility by halting program trading for five minutes; it is triggered when the relevant market remains down 5% from the previous close for one minute.