KOSPI Plunges 4%, Trading Halt Triggered by China's 'Moonshot AI Shock'

South Korea's KOSPI index plunged more than 4% on Monday, triggering a "sell-side car" trading suspension as investors reacted to a confluence of negative global factors. The benchmark index fell sharply after the extended holiday weekend, hitting lows not seen in months.

The primary driver of the sell-off appears to be renewed concerns about the artificial intelligence (AI) semiconductor market. The recent unveiling of "Kimi K3," a new AI model by Chinese startup Moonshot AI, has reignited fears of a potential peak in the AI chip cycle. This development reportedly spooked investors in the U.S. markets, leading to a ripple effect in South Korea.

"This model, with its low-cost, open-source strategy, has shocked the market," said Kim Seok-hwan, a researcher at Mirae Asset Securities. "It amplifies doubts about the profitability of large-scale AI investments, fueling a sell-off in existing AI leaders."

Adding to the market's woes, the escalating tensions in the Middle East, particularly between Israel and Iran, have sent international oil prices soaring. This geopolitical instability further dampened investor sentiment, contributing to the broad market decline.

Major South Korean tech giants were hit hard, with Samsung Electronics and SK Hynix experiencing significant drops in their stock prices. The KOSDAQ index also saw a substantial decline, with a sell-side car activation also occurring on that market. The widespread nature of the downturn suggests a broad investor retreat amid the prevailing uncertainties.

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This model, with its low-cost, open-source strategy, has shocked the market. It amplifies doubts about the profitability of large-scale AI investments, fueling a sell-off in existing AI leaders.