Samsung SDI is trading 8.63% down at KRW 540,000 amid a broad South Korean equity selloff, with available evidence pointing to macro and market sentiment rather than a company-specific announcement. - Reuters reported the KOSPI closed down 7.57% on October 15. - Investors reacted to hotter U.S. inflation, rate-hike concerns and doubts about AI investment; the decline was consistent with wider risk-off pressure on Korean technology and battery stocks.