[Edaily Reporter PARK MIN ] The KOSPI is rebounding sharply by more than 10% in early trading on the 31st, recovering from a three-day plunge. As the market surged in early trading, the “buy-side sidecar”—a temporary suspension of program buy orders—was triggered almost simultaneously in both the KOSPI and KOSDAQ markets.

According to the Korea Exchange, at 9:06:02 a.m. that day, the effectiveness of program buy orders in the KOSPI market was suspended for five minutes due to fluctuations in the KOSPI 200 futures index. At the time of activation, the KOSPI 200 futures index stood at 997.50, a sharp rise of 129.90 points (14.97%) from the previous day’s closing price.
The KOSPI “sidecar” mechanism is triggered when the KOSPI 200 futures price rises by 5% or more relative to the benchmark price and remains at that level for one minute; it suspends the validity of program buy orders for five minutes.
Just one second later, at 9:06:03 a.m., a buy-side sidecar was triggered in the KOSDAQ market due to fluctuations in the KOSDAQ 150 futures price and the spot index, suspending the validity of program buy orders for five minutes. At the time of activation, the KOSDAQ 150 futures price stood at 1,163.80, a sharp rise of 99.40 points (9.33%) from the previous day’s closing price.
The KOSDAQ sidecar is triggered when the KOSDAQ 150 futures price rises by 6% or more from the benchmark price and the KOSDAQ 150 index rises by 3% or more from the closing level of the previous trading day, and both conditions persist simultaneously for one minute.
According to MP Doctor, as of 9:20 a.m. today, the KOSPI stood at 6,324.83, up 731.27 points (13.07%) from the previous trading day. In terms of market sentiment, foreign investors led the sharp rise in the index with net purchases of 3.7743 trillion won. Retail investors recorded net sales of 3.2138 trillion won, while institutional investors recorded net sales of 462.3 billion won.
SamsungElectronics(005930), a leading KOSPI stock, is trading at 247,500 won, up 19.57% from the previous trading day. SK hynix(000660)also surged 22.69% to 1,622,000 won, and SamsungElectronics(1P)(005935) continued its strong performance with a 20.33% gain.
At the same time, as of 9:21 a.m. on the 31st, the KOSDAQ index stands at 692.21, up 47.43 points (7.36%) from the previous trading day. Institutional investors are driving the index higher with net purchases of 53 billion won, while foreign investors are net buyers of 46.3 billion won; retail investors, meanwhile, are net sellers of 99.6 billion won.
Today’s sharp rise in the stock market is attributed to a recovery in investor sentiment, driven by the fact that stock prices had recently undergone an excessive correction, coupled with a significant rise in semiconductor stocks on the New York Stock Exchange overnight. On the 30th (local time), the Philadelphia Semiconductor Index—comprising 30 major U.S.-listed semiconductor stocks—rose 8.19%, and major semiconductor stocks such as Micron Technology (18.36%), SanDisk (25.99%), AMD (13.00%), and Intel (11.30%) posted double-digit gains.
Han Ji-young, an analyst at KIWOOM Securities, predicted, “The KOSPI is expected to rebound, driven by expectations that the deleveraging trend in the semiconductor sector will ease, Amazon’s after-hours stock price surging by over 9% following an earnings surprise, and KOSPI 200 overnight futures hitting the daily upper limit.”