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KOSPI plunges 3.48% on AI investment worries

South Korea's benchmark KOSPI fell 3.48% on Friday, closing at 5,730.74, as concerns over returns on artificial intelligence investments triggered a tech-led selloff (Korea Times, Yonhap). The drop followed weak earnings from Alphabet and worries over AI costs, with foreign investors net-selling 1.8 trillion won in the KOSPI market (Chosun Ilbo). Heavyweight chipmakers Samsung Electronics fell about 3% and SK hynix dropped 7%, and a sell-side circuit breaker was triggered during the session (Dong-A Ilbo, Korea Economic Daily). The tech-heavy KOSDAQ also lost 28.85 points, or over 3% (KBS World).

  1. KOSPI falls 3.48% as US tech earnings fuel AI investment concerns Korea Times · 2026-10-30
  2. [마켓뷰] AI 투자 우려에 코스피 ‘직격탄’… SK하이닉스 7% 하락 조선일보 · 2026-10-30
  3. ‘AI 거품론’ 확산에 코스피 5730선 후퇴…삼전·닉스 동반 추락 동아일보 · 2026-10-30
  4. 코스피 3.48% 급락…삼성전자 3%·SK하이닉스 7%↓ 한국경제 · 2026-10-30
  5. KOSPI Down 3.48% Friday KBS World · 2026-10-30

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