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South Korea’s KOSPI Falls 6.12% as SK Hynix and Samsung Slide

South Korea’s KOSPI briefly rose above 8,000 before reversing sharply as foreign investors sold KRW 1.6 trillion in morning trade and technology shares led a broader risk-off decline.

Fact Check
The core elements of the claim are well-supported. The Odaily newsflash/481593 confirms KOSPI fell more than 5% and triggered a circuit breaker on May 15, 2026, and that MSCI Emerging Asia fell over 1.7%. The newsflash/481594 shows an intraday low of 7,421.91 (-7.00%), consistent with a close of 7,493.2 (-6.12%) after partial recovery. The SF Chronicle (AP) article confirms KOSPI had been above 8,000 on May 15 before falling. The newsflash/481530 confirms Samsung Electronics was declining early in the session. The specific closing figure of 7,493.2 and the exact 6.12% decline figure are not independently confirmed by a primary exchange source in this run, introducing some uncertainty, but all directional and magnitude details are consistent with the sourced evidence. The sell-side circuit breaker and heavy technology selling (SK Hynix, Samsung) are consistent with the broader narrative confirmed across sources.
Summary

South Korea’s KOSPI briefly traded above 8,000 before reversing into a sharp sell-off, ultimately closing down 6.12% at 7,493.2 after deeper intraday losses that at one point were reported at more than 5% and as much as 7.00% to 7,421.91, triggering a five-minute sell-side circuit breaker. Heavy technology selling led the decline, with SK Hynix down 7.66% and Samsung Electronics down 8.61% by the close, while SK Square was also among the major decliners. In morning trade, foreign investors sold KRW 1.6 trillion, adding pressure to the market. Reports linked the move to rising oil prices, stalled U.S.-Iran talks, heavy outflows, profit-taking after a strong rebound in Asian emerging market equities since April, and company-specific concerns around Samsung Electronics wage negotiations and a possible strike.

Terms & Concepts
  • KOSPI: South Korea’s main stock market index, widely used as a benchmark for the country’s equity market performance.
  • Sell-side circuit breaker: A temporary trading halt triggered during sharp market declines to slow heavy selling and help stabilize price discovery.
  • Foreign investors: Investors based outside the domestic market whose buying or selling flows can significantly affect trading volume, prices and market sentiment.