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Black Thursday Stock Crash Wipes Out Over 400 Trillion Won in Market Cap in a Single Day

Cho Ji-hyun

Published : Oct 15, 2026 8:27 PM

Video

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■ Broadcast: SBS News Hunters Mon–Fri (18:50–19:50)
■ Anchors: Kim Jong-won, Yoon Tae-jin
■ Panelists: Yoon Jin (CEO of Black Quant Equity), Huh Joon-young (Professor of Economics at Sogang University)
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It was Black Thursday as both the KOSPI and KOSDAQ indices plummeted by over 7%. The market capitalization of listed companies evaporated by more than 400 trillion won in a single day today, and the KOSPI has dropped more than 40% from its previous peak recorded last June. In particular, South Korea's semiconductor duopolists Samsung Electronics and SK Hynix, which account for about half of the KOSPI, are seeing their stock prices slide amid growing concerns over rising financing costs and deteriorating profitability for AI companies, coupled with China's CXMT announcing the commercialization of new technology. Amid this situation, we examine what individual investors facing mounting losses should do and how the stock market is expected to move going forward.

※ More details can be found in the video.