Key facts
- The Korea Exchange activated a buy-side sidecar for the KOSPI index on Tuesday, October 27, 2026.
- Program trading for KOSPI-listed shares was suspended for five minutes.
- The KOSPI index gained 4.42 percent to 5,711.22 as of 10:20 a.m. on October 27, 2026.
South Korea's bourse operator, the Korea Exchange (KRX), activated a buy-side sidecar for the benchmark Korea Composite Stock Price Index (KOSPI) on Tuesday, October 27, 2026, due to a sharp market rise. Program trading for KOSPI-listed shares was halted for five minutes at 10:13 a.m. The KOSPI opened 3.46 percent higher and later gained 241.75 points, or 4.42 percent, to 5,711.22 by 10:20 a.m. The rally was fueled by optimism over artificial intelligence and declining oil prices, which boosted investor sentiment. A buy-side sidecar is activated if the KOSPI 200 Futures Index increases by 5 percent or more for at least one minute.