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On Oct. 30, the KOSPI opened sharply lower and fell more than 5% in late morning trade, driven by heavy losses in technology shares amid renewed concerns over the sustainability of the AI boom, following overnight plunges in U.S. big tech stocks like Alphabet (Korea Times, Yonhap). The index opened 2.99% lower at 5,760.35 (KBS World), and the Korea Exchange activated a sell-side sidecar, suspending program trading for KOSPI-listed shares for five minutes (Korea Times, Yonhap). Earlier in the week, the KOSPI had already fallen 1.24% on Oct. 29 to close at 5,937.66 (KBS World).