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    Intelligence Feed event · Macro · 2026-11-05

    South Korean shares plunge as semiconductor stocks trigger a market circuit breaker

    Question

    South Korean shares plunge as semiconductor stocks trigger a market circuit breaker

    Direct answer

    The selloff directly pressures Korean equity indices and memory-chip shares and raises volatility across Asian technology markets.

    Original publisher
    Market Ontology
    Evidence through
    2026-11-05
    Published
    2026-11-05
    Revision
    1 · 2026-11-06

    Cite as: Market Ontology, “South Korean shares plunge as semiconductor stocks trigger a market circuit breaker”, revision 1, evidence through 2026-11-05. https://marketontology.com/market-events/2026-11-05/south-korean-shares-plunge-as-semiconductor-stocks-trigger-a-market-circuit-brea-ea9501

    MACRO
    South Korean shares plunge as semiconductor stocks trigger a market circuit breaker
    The selloff directly pressures Korean equity indices and memory-chip shares and raises volatility across Asian technology markets.
    KOSPISK HYNIXSAMSUNG ELECTRONICSSOXX
    Impact
    83
    NOV 5
    SIG
    KOSPISK HYNIXSAMSUNG ELECTRONICS
    South Korean shares plunge as semiconductor stocks trigger a market circuit breaker
    The selloff directly pressures Korean equity indices and memory-chip shares and raises volatility across Asian technology markets.
    Impact
    The selloff directly pressures Korean equity indices and memory-chip shares and raises volatility across Asian technology markets.
    Affected
    KOSPISK HYNIXSAMSUNG ELECTRONICSSOXX
    Source facts

    How this development reaches the affected companies

    AssetExposure and channelDirectionEvidence
    KOSPIHeavy losses in index-leading memory-chip companies pulled the benchmark lowerDownintradayThe KOSPI fell 5.28% and a sell-side circuit breaker was triggered
    SK HYNIXConcern over slower AI infrastructure spending undermines expected demand for high-bandwidth memoryDown1-5dSK Hynix shares fell more than 9% during the session
    SAMSUNG ELECTRONICSPotential moderation in data-center investment threatens semiconductor revenue expectationsDown1-5dSamsung shares declined more than 7%
    SOXXA sharp repricing of Korean memory-chip exposure signals broader risk to global semiconductor valuationsDown1-5dThe Korean chip selloff was linked to concern about US AI investment and future semiconductor exports

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    What happened next

    AssetCallBase close+1 day+5 days+20 days
    SOXXDown150.14 2026-11-04PendingPendingPending

    Closing prices from stored daily bars; returns measured from the last close on or before the event date. Not a recommendation.

    Sources

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