Key facts
- South Korea's KRX activated a buy-side sidecar for the KOSPI index.
- Program trading was suspended for five minutes following a sharp market rise.
- The KOSPI index increased by 4.03% to 8,451.32.
South Korea's bourse operator KRX activated a buy-side sidecar for the KOSPI index on Monday, suspending program trading for five minutes due to a sharp 4.03% increase. The surge was driven by news of a U.S.-Iran peace deal and the reopening of the Strait of Hormuz.

The activation of a sidecar indicates extreme market volatility, highlighting the significant impact of geopolitical developments on investor sentiment and trading activity in South Korean equities.
South Korea's benchmark Korea Composite Stock Price Index (KOSPI) experienced a sharp rise on Monday, prompting the Korea Exchange (KRX) to activate a buy-side sidecar. Program trading for KOSPI-listed shares was suspended for five minutes shortly after the market opened.
The KOSPI surged by 327.7 points, or 4.03 percent, reaching 8,451.32 as of 9:07 a.m. This significant gain was driven by investors acquiring blue-chip tech shares following an announcement by U.S. President Donald Trump that the United States and Iran have reached a deal to end their conflict and reopen the Strait of Hormuz. A formal signing ceremony is anticipated on Friday.
A buy-side sidecar is a mechanism triggered when the KOSPI 200 Futures index increases by 5 percent or more for at least one minute, aiming to curb excessive volatility.
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