SEOUL — The South Korean benchmark KOSPI index experienced a dramatic surge immediately after the opening bell on Monday, triggering a temporary suspension of program buying orders—commonly known as a "buy sidecar"—as geopolitical risks in the Middle East dissolved overnight following a historic peace agreement between the United States and Iran.

According to the Korea Exchange (KRX), the buy sidecar was activated at 9:06:02 AM for a duration of five minutes. The regulatory circuit breaker was tripped when the benchmark KOSPI 200 futures index skyrocketed to 1,365.85, marking a staggering increase of 66.00 points, or 5.07%, from the previous session's close.

Under KRX regulations, a KOSPI sidecar is automatically triggered when the KOSPI 200 futures price fluctuates by 5% or more from the base price, and that variance sustains for at least one full minute. The mechanism halts all program buying orders for five minutes to prevent extreme high-frequency trading volatility from destabilizing the broader market.

Driven by the monumental geopolitical breakthrough, the KOSPI index opened at an astonishing 8,526.12, up 402.50 points (4.95%) from the previous close. The tech-heavy KOSDAQ index followed suit, kicking off the trading day at 1,048.19, up 19.14 points (1.86%), and maintained a strong upward trajectory throughout the morning session.

Financial analysts noted that the unprecedented wave of aggressive buying that overwhelmed the domestic stock exchange at the opening bell was the direct result of a sudden evaporation of the geopolitical uncertainties that had long plagued global financial markets.

According to foreign media dispatches, the United States and Iran are reportedly scheduled to sign a Memorandum of Understanding (MOU) outlining a comprehensive post-war roadmap in Geneva, Switzerland, as early as the 14th (local time).

Market experts pointed to two primary catalysts behind the market's explosive rally and the subsequent sidecar activation: a sharp plunge in international crude oil prices and a stabilization of the won-dollar exchange rate, which sparked a massive influx of foreign capital. With the threat of prolonged conflict lifted, the burden of high oil prices on domestic manufacturing companies was alleviated, driving heavy institutional and retail buying into critical primary industries such as refining, chemicals, and shipbuilding.

Furthermore, as the geopolitical standoff between Washington and Tehran cooled down, safe-haven demand for the U.S. dollar sharply receded. This led to a steep decline and subsequent stabilization of the won-dollar exchange rate, creating an optimal environment for international investors.

"The visible prospects of an extended truce and the easing of maritime blockades triggered a historic short squeeze in the market today," a senior market strategist stated. "South Korean equities, which had been severely undervalued due to the prolonged war risks, saw a massive and sudden inflow of foreign capital. This buying pressure heavily concentrated in the futures market first, overheating the index and ultimately leading to the sidecar activation."

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