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On Oct. 30, the KOSPI fell 206.92 points, or 3.48%, to close at 5,730.74, as losses in U.S. tech stocks and worries over AI investment returns triggered heavy selling in chipmakers Samsung Electronics (down 3%) and SK hynix (down 7%). Foreign investors net sold over 1.6 trillion won, and the KRX activated a sell-side sidecar, suspending program trading for five minutes. The KOSDAQ also dropped 3%. The decline followed a 1.24% fall on Oct. 29, with the index opening 2.99% lower and at one point sinking over 5% late morning. Korean media attribute the rout to U.S. big tech earnings disappointments, including Alphabet, and Fed tightening concerns.