AI chip stocks in South Korea and Japan tumbled sharply on October 13, 2026, following a massive selloff in US semiconductor shares. South Korea’s Kospi index fell approximately 5.5%, dragged down by Samsung Electronics and SK Hynix, which both declined by 7-10%. In Japan, Kioxia led the decline with a 12-13% drop in its share price. Foreign investors sold more than $6.3 billion worth of Korean shares in October 2026, as the US Philadelphia Semiconductor Index (.SOX) posted its sixth consecutive decline.
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