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KOSPI Plunges on U.S. Big Tech Slump

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 (KBS World). The index tumbled more than 4% intraday, triggering a sell-side sidecar that suspended program trading for five minutes (KBS World, Korea Times, Yonhap). This follows a 1.24% drop on Oct. 29 to 5,937.66, and a 3.52% plunge on Oct. 22 to 5,533.77, amid a broader tech and semiconductor selloff (KBS World, Business Korea). Korean media attribute the decline to disappointing U.S. quarterly results and concerns over AI investment costs (Korea Times).

  1. [Opening Market] KOSPI Opens Sharply Lower Below 6,000 on U.S. Big Tech Plunge Business Korea · 2026-10-30
  2. KOSPI Tumbles More than 4% in Intraday Trading; Program Selling Halted KBS World · 2026-10-30
  3. KOSPI Down 1.24% Thursday KBS World · 2026-10-29
  4. [Morning Market] KOSPI Threatens 5,300 Level Amid Tech Selloff Business Korea · 2026-10-23
  5. KOSPI Down 1.46% Monday KBS World · 2026-10-26
  6. KOSPI Down 3.52% Thursday KBS World · 2026-10-22
  7. KOSPI Opens 2.99% Lower on Friday KBS World · 2026-10-30
  8. Big Tech earnings to test AI boom amid market turmoil Korea Times · 2026-10-28
  9. KRX activates sell-side sidecar for KOSPI on sharp fall Korea Times · 2026-10-30
  10. (URGENT) KRX activates sell-side sidecar for KOSPI on sharp decline Yonhap · 2026-10-30

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