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KOSPI Plunges 4%, Sell-Side Sidecar Triggered

On Friday, Oct. 30, the KOSPI plunged more than 4% in intraday trading, prompting the Korea Exchange (KRX) to activate a sell-side sidecar, which temporarily halts program selling for KOSPI-listed shares. Yonhap and the Korea Times report the sidecar was triggered as the index fell sharply, with Chosun Ilbo noting the index dropped over 5% to around 5,630 points, driven by overnight Wall Street losses after disappointing Alphabet earnings raised AI investment cost concerns. Korean media outlets, including Maeil Business and KBS World, are covering the sharp decline and the market's reaction to the global tech sell-off.

  1. (URGENT) KRX activates sell-side sidecar for KOSPI on sharp decline Yonhap · 2026-10-30
  2. KRX activates sell-side sidecar for KOSPI on sharp fall Korea Times · 2026-10-30
  3. KOSPI Tumbles More than 4% in Intraday Trading; Program Selling Halted KBS World · 2026-10-30
  4. [속보] 코스피 4%대 급락…매도 사이드카 발동 매일경제 · 2026-10-30
  5. 코스피, 알파벳發 쇼크에 5%대 폭락… 매도 사이드카 발동 조선일보 · 2026-10-30

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