{"id":63766,"date":"2026-06-25T23:38:15","date_gmt":"2026-06-26T03:38:15","guid":{"rendered":"https:\/\/www2.stockmarketwatch.com\/stock-market-news\/asian-markets-shaken-as-kospi-triggers-circuit-breakers-and-taiwan-margin-debt-hits-record-highs\/63766\/"},"modified":"2026-06-25T23:38:15","modified_gmt":"2026-06-26T03:38:15","slug":"asian-markets-shaken-as-kospi-triggers-circuit-breakers-and-taiwan-margin-debt-hits-record-highs","status":"publish","type":"post","link":"https:\/\/www2.stockmarketwatch.com\/stock-market-news\/asian-markets-shaken-as-kospi-triggers-circuit-breakers-and-taiwan-margin-debt-hits-record-highs\/63766\/","title":{"rendered":"Asian Markets Shaken as KOSPI Triggers Circuit Breakers and Taiwan Margin Debt Hits Record Highs"},"content":{"rendered":"<h2>Key Takeaways<\/h2>\n<ul>\n<li><strong>South Korea\u2019s KOSPI index triggered a 20-minute trading halt<\/strong> after a sudden <strong>8% plunge<\/strong> on June 26, marking the fourth such activation of circuit breakers in 2026.<\/li>\n<li><strong>Taiwan\u2019s retail margin debt surged to a record NT$600 billion (US$19 billion)<\/strong>, surpassing levels seen during the 2000 Dot-Com Bubble and raising fears of a speculative collapse.<\/li>\n<li><strong>China\u2019s CSI 300 Index declined over 3%<\/strong> as broad market weakness and disappointing economic data weighed on investor sentiment across the region.<\/li>\n<li><strong>Semiconductor heavyweights led the rout<\/strong>, with Samsung Electronics (<a href=\"\/stock\/005930\">005930<\/a>) and SK Hynix (<a href=\"\/stock\/000660\">000660<\/a>) both seeing double-digit intraday losses amid a global reassessment of AI valuations.<\/li>\n<\/ul>\n<h2>KOSPI Trading Halted Amid Tech Sell-Off<\/h2>\n<p>The <strong>Korea Exchange<\/strong> was forced to suspend trading for 20 minutes on Friday after the <strong>KOSPI<\/strong> index plummeted more than <strong>8%<\/strong>, triggering a Level 1 circuit breaker. The sharp decline was primarily driven by a violent reversal in the &quot;AI trade&quot; that had previously propelled the index to record highs earlier this year.<\/p>\n<p>Heavyweight chipmakers Samsung Electronics (<a href=\"\/stock\/005930\">005930<\/a>) and SK Hynix (<a href=\"\/stock\/000660\">000660<\/a>), which together account for a massive portion of the index&#39;s weighting, saw their shares crater as foreign investors offloaded tech holdings. Analysts noted that the sell-off was exacerbated by <em>concerns over U.S. interest rate policy<\/em> and <em>disappointing export data from China<\/em>, leading to a &quot;stampede&quot; of program selling.<\/p>\n<h2>Taiwan Margin Debt Surpasses Dot-Com Era Levels<\/h2>\n<p>Speculative activity in Taiwan has reached a fever pitch, with <strong>retail margin loans<\/strong> hitting a record <strong>NT$600 billion (US$19 billion)<\/strong>. This level of leverage now exceeds the peak of the 2000 Dot-Com Bubble, highlighting a dangerous buildup of &quot;debt-fueled investing&quot; among individual traders.<\/p>\n<p>The frenzy has been centered on Taiwan Semiconductor Manufacturing Co. (TSMC) (<a href=\"\/stock\/2330\">2330<\/a>), which now represents over <strong>40% of the TAIEX index<\/strong>. While the <strong>Financial Supervisory Commission (FSC)<\/strong> has stepped up monitoring of household leverage, brokerages are reportedly reaching their internal lending limits, forcing some to raise collateral requirements.<\/p>\n<h2>China\u2019s CSI 300 Slumps on Economic Headwinds<\/h2>\n<p>In mainland China, the <strong>CSI 300 Index<\/strong> fell by more than <strong>3%<\/strong>, reflecting broader regional weakness and internal economic pressures. The decline comes as investors digest <em>uneven economic data<\/em>, including a slump in the property sector and softening consumer confidence.<\/p>\n<p>The tech-heavy <strong>STAR50 Index<\/strong> also faced significant pressure, as the global retreat from high-valuation semiconductor stocks spilled over into Chinese markets. Market participants are now closely watching for potential <em>Bank of Korea intervention<\/em> or emergency liquidity measures from Chinese authorities to stabilize the cascading volatility in Asian equities.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways South Korea\u2019s KOSPI index triggered a 20-minute trading halt after a sudden 8% plunge on June 26, marking 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