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On Oct. 30, the KOSPI opened sharply lower, falling 2.99% to 5,760.35, after U.S. big tech stocks like Alphabet plunged overnight, triggering disappointment selling (Business Korea, KBS World). The index later tumbled more than 4% in morning trade, and by late Friday morning it was down over 5%, led by tech losses amid renewed AI-boom concerns (KBS World, Korea Times). The KRX activated a sell-side sidecar, suspending program trading for five minutes (Korea Times). Earlier in the week, the KOSPI had already fallen 3.52% on Oct. 22 and 1.24% on Oct. 29, reflecting persistent tech-led volatility (KBS World).