Le Kospi et le Kosdaq chutent de plus de 6 %, des mécanismes de suspension des ventes se déclenchent sur les deux marchés

bloomingbit · 2026-10-15T01:02:34.000Z

Un choc inflationniste provoqué par les États-Unis et les inquiétudes liées aux investissements dans l’intelligence artificielle ont fait reculer les actions sud-coréennes. Peu après l’ouverture du 15 octobre, le Kospi et le Kosdaq ont tous deux chuté de plus de 6 %, déclenchant des mécanismes de suspension des ordres de vente dans les deux marchés. La plupart des grandes capitalisations, y compris les valeurs des semi-conducteurs, ont également baissé. À 9 h 23, le Kospi s’établissait à 5 641,71 points, en baisse de 367,10 points, soit 6,11 %, par rapport à la séance précédente. L’indice de référence a ouvert en recul de 5,59 %, puis ses pertes se sont creusées à mesure que les ventes s’intensifiaient. À 9 h 07, un mécanisme suspendant temporairement les ordres de vente programmés s’est déclenché. Il s’agissait du deuxième déclenchement de ce type en deux jours, après celui du 13 octobre.

A U.S.-driven inflation shock and anxiety over artificial intelligence investment hit South Korean stocks. Shortly after the Oct. 15 open, the Kospi and Kosdaq both fell more than 6%, triggering sell-side sidecars in both markets. Most heavyweight shares, including semiconductor stocks, also declined.
As of 9:23 a.m., the Kospi stood at 5,641.71, down 367.10 points, or 6.11%, from the previous session. The benchmark opened 5.59% lower and widened its losses as selling intensified. At 9:07 a.m., a sidecar that temporarily suspends program sell orders was triggered, the second such move in two days after Oct. 13.
The Kosdaq also failed to escape the rout. After opening 4.79% lower than the previous trading day, the index fell to 767.70 as of the same time. That marked a drop of 56.18 points, or 6.82%. A sell-side sidecar for the Kosdaq market was triggered at 9:12 a.m.
Samsung Electronics fell more than 7%, while SK Hynix dropped more than 8%. Sentiment toward AI-related shares cooled overnight in the U.S. after concerns resurfaced over the debt burden of AI cloud company CoreWeave and Gartner warned that returns on AI investment may fall short of expectations. The development also weighed on hopes that expanding data-center investment would boost semiconductor demand.
Weakness spread to other large-cap stocks. SK Square, LG Energy Solution, Samsung Electro-Mechanics, Hyundai Motor, KB Financial, Samsung Biologics, Samsung Life Insurance and Samsung SDI all declined, leaving all of the top 10 Kospi stocks by market capitalization in the red. On the Kosdaq, Alteogen, EcoPro, EcoPro BM, Jusung Engineering and Rainbow Robotics fell. HLB, Leeno Industrial, EO Technics, Wonik IPS and Simmtech also traded lower.
Investor flows diverged by market. On the Kospi, foreign investors were net sellers of 982.8 billion won, while institutions were net buyers of 951.4 billion won and retail investors bought a net 4.1 billion won. On the Kosdaq, retail investors were net sellers of 112 billion won, while foreign and institutional investors bought 106.8 billion won and 8.2 billion won, respectively.
The selloff in risk assets was fueled by rising U.S. inflation. The U.S. consumer price index for September rose 3.7% from a year earlier, topping the market forecast of 3.6%. The stronger reading increased the likelihood of additional Federal Reserve rate hikes, adding pressure to technology and growth stocks.
On Oct. 14, the tech-heavy Nasdaq Composite fell 1.88% in New York. The S&P 500 dropped 1.11%, while the Dow Jones Industrial Average slipped 0.09%. Concerns over U.S. interest-rate pressure and AI investment have spilled over into South Korean equities.