{"id":72921,"date":"2026-10-13T03:08:12","date_gmt":"2026-10-13T07:08:12","guid":{"rendered":"https:\/\/www2.stockmarketwatch.com\/stock-market-news\/kospi-plunges-over-5-as-ai-profitability-fears-and-chinese-competition-rattle-markets\/72921\/"},"modified":"2026-10-13T03:08:12","modified_gmt":"2026-10-13T07:08:12","slug":"kospi-plunges-over-5-as-ai-profitability-fears-and-chinese-competition-rattle-markets","status":"publish","type":"post","link":"https:\/\/www2.stockmarketwatch.com\/stock-market-news\/kospi-plunges-over-5-as-ai-profitability-fears-and-chinese-competition-rattle-markets\/72921\/","title":{"rendered":"Kospi Plunges Over 5% as AI Profitability Fears and Chinese Competition Rattle Markets"},"content":{"rendered":"<h2>Key Takeaways<\/h2>\n<ul>\n<li><strong>South Korea&#39;s benchmark Kospi index plummeted 5.46% to close at 6,035.36<\/strong>, marking its weakest finish since July 30 and triggering a sell-side &quot;sidecar&quot; trading curb.<\/li>\n<li><strong>Semiconductor giants Samsung Electronics (<a href=\"\/stock\/005930\">005930<\/a>) and SK Hynix (<a href=\"\/stock\/000660\">000660<\/a>) saw massive sell-offs<\/strong>, dropping <strong>7.39%<\/strong> and <strong>10.09%<\/strong> respectively, as investors reacted to rapid technological advances from Chinese rival <strong>ChangXin Memory Technologies (CXMT)<\/strong>.<\/li>\n<li><strong>Renewed AI sector concerns and persistent inflation pressure<\/strong> dominated the session, with the <strong>VKOSPI &quot;fear index&quot; surging 23%<\/strong> to reach 51 points, its highest level since early March.<\/li>\n<li><strong>Geopolitical tensions and rising energy costs<\/strong> added to the rout, as Brent crude hovered near <strong>$106 per barrel<\/strong> following fresh Middle East conflicts, fueling fears of sustained global inflation.<\/li>\n<\/ul>\n<p>The South Korean stock market suffered one of its most volatile sessions of the year on Tuesday, as the <strong>Kospi<\/strong> tumbled more than 5% amid a perfect storm of technology sector anxiety and macroeconomic headwinds. The index dipped as low as <strong>5,911.11<\/strong> during intraday trading, briefly breaking the psychologically significant <strong>6,000-point mark<\/strong> for the first time in months.<\/p>\n<p>The primary catalyst for the rout was a sharp reassessment of the artificial intelligence trade. Investors were spooked by reports that Chinese memory maker <strong>ChangXin Memory Technologies (CXMT)<\/strong> has made significant progress on a <strong>4F\u00b2 memory-cell architecture<\/strong>, a technology that could significantly narrow the gap with global leaders. This development sparked fears that the current &quot;scarcity premium&quot; enjoyed by South Korean chipmakers could evaporate as Chinese supply becomes more competitive.<\/p>\n<p><strong>Samsung Electronics (<a href=\"\/stock\/005930\">005930<\/a>)<\/strong> and <strong>SK Hynix (<a href=\"\/stock\/000660\">000660<\/a>)<\/strong>, which together account for more than half of the Kospi&#39;s total weight, bore the brunt of the selling. <strong>SK Hynix (<a href=\"\/stock\/000660\">000660<\/a>)<\/strong> saw its stock price crater by over <strong>10%<\/strong> to <strong>1.443 million won<\/strong>, while <strong>Samsung Electronics (<a href=\"\/stock\/005930\">005930<\/a>)<\/strong> fell to <strong>232,000 won<\/strong>. The rapid decline forced the <strong>Korea Exchange<\/strong> to activate a five-minute sidecar mechanism to temporarily halt program sell orders and restore order to the market.<\/p>\n<p>Beyond the semiconductor sector, broader economic pressures weighed heavily on sentiment. <em>Persistent inflation concerns<\/em> were exacerbated by a spike in <a href=\"https:\/\/stockmarketwatch.com\/energy\/crude-oil\" data-internallinksmanager029f6b8e52c=\"12\" title=\"Crude oil\">oil prices<\/a>, with Brent crude rising toward <strong>$106<\/strong> following reports of Iranian strikes on commercial vessels in the <strong>Strait of Hormuz<\/strong>. This geopolitical shock has led analysts to believe that central banks, including the <strong>Bank of Korea<\/strong>, may maintain a hawkish stance for longer than previously anticipated.<\/p>\n<p>The sell-off was not confined to Korea, as regional peers also felt the heat. Japan&#39;s <strong>Nikkei 225<\/strong> fell <strong>1.82%<\/strong>, while technology-heavy names like <strong>SoftBank Group (<a href=\"\/stock\/9984\">9984<\/a>)<\/strong> and <strong>Tokyo Electron (<a href=\"\/stock\/8035\">8035<\/a>)<\/strong> saw declines of <strong>8.5%<\/strong> and <strong>6.6%<\/strong> respectively. Market participants are now closely watching upcoming U.S. earnings and inflation data to see if the AI-driven &quot;valuation reset&quot; will continue to spread across global markets.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways South Korea&#39;s benchmark Kospi index plummeted 5.46% to close at 6,035.36, marking its weakest finish since July 30 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":50383,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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