South Korea’s stock market endured one of its worst trading days in decades on March 4 as the benchmark Kospi index plunged more than 12%, triggering emergency circuit breakers and rattling investors across Asia. The sell-off, driven by escalating geopolitical tensions linked to the U.S.-Israel conflict with Iran, marked a dramatic reversal for a market that had rallied strongly in recent months.

According to local reports, trading on the Korea Exchange was temporarily halted after the Kospi’s steep decline, while the Kosdaq index also fell about 13%, activating its own circuit breaker. Leading indices down were Samsung Electronics, which dropped roughly 7%, and SK Hynix, which fell 5%, underscoring the vulnerability of South Korea’s tech-heavy market. Together, the two companies account for nearly half of the Kospi’s weighting, amplifying the impact of their losses.

Lorraine Tan, Asia director of equity research at Morningstar, told CNBC the downturn reflected both profit-taking after a strong rally and growing concerns about the pace of artificial intelligence data center expansion.

“The drop in share prices is partly driven by profit-taking amidst a risk-off environment but also implies concern that AI data center adoption might slow due to significantly higher energy costs,” she said.

Jim Bianco of Bianco Research added broader context, noting that South Korea’s market is unusually retail-driven, with individual investors accounting for the majority of trading volume.

“This is what retail-dominated markets do. They don’t rally, they double. They don’t correct, they crash,” Bianco observed, highlighting the volatility inherent in a market where sentiment can swing sharply.

He also pointed out South Korea’s heavy reliance on imported oil—94% of its supply, with 75% from the Middle East—making the economy acutely sensitive to energy price shocks.

Analysts warn that the combination of geopolitical instability, surging energy costs, and concentrated exposure to a handful of tech giants could keep South Korea’s markets under pressure. The Kospi’s plunge eclipsed declines seen during the 2001 terrorist attacks and the 2008 financial crisis, underscoring the severity of the current sell-off.

• Why did South Korea’s Kospi plunge over 12%? Escalating Middle East tensions triggered a historic sell-off and circuit breakers.
• Which companies led the losses? Samsung Electronics fell 7% and SK Hynix dropped 5%, dragging the index lower.
• Why is the Kospi so vulnerable? Analysts note heavy retail trading and tech concentration amplify volatility.
• How do energy costs factor into the downturn? South Korea’s reliance on Middle East oil makes it highly sensitive to price shocks.

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