South Korean stocks fell sharply, with chip giants Samsung Electronics and SK Hynix recording the steepest declines. The trigger was DeepSeek’s V4.1-Flash model released on September 10, 2026, which claims to require only a quarter of the high-bandwidth memory (HBM) needed by its predecessors for inference. On September 11, 2026, Samsung shares fell about 3.5% and SK Hynix about 2.2%. By mid-October 2026, the benchmark KOSPI index dropped to a six-month low around 5,554, while Samsung and SK Hynix each shed between 9% and 11%. Competition from Chinese memory chip makers like CXMT and broader doubts about massive AI spending amid rising inflation further weighed on the market.
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