The KOSPI index fell approximately 10% [1] from a record high on June 23, 2026, following a massive selloff of semiconductor stocks.
This downturn signals a potential shift in investor sentiment regarding artificial intelligence. Because the South Korean market is heavily weighted toward chip manufacturers, a correction in AI expectations can trigger systemic volatility across the region.
Investors targeted chip heavyweights, specifically Samsung Electronics and SK Hynix [2]. The selloff was driven by renewed concerns that the AI-driven rally had become overstretched [3]. This wave of selling came immediately after the index had reached a record high on the day before the plunge [4].
The volatility was severe enough to disrupt standard operations on the Korea Exchange. Trading was suspended for 20 minutes [5] to manage the rapid decline in asset prices. While some reports indicated a drop closer to nine%, other data confirmed the plunge reached 10% [1].
The crash reflects a broader reality check for the technology sector. For months, the promise of AI integration has pushed valuations to historic levels. The sudden pivot on Tuesday suggests that market participants are now weighing the actual delivery of AI profits against the speculative growth of the past year.
Analysts said that the concentration of the KOSPI in memory chip production makes the index particularly sensitive to global tech trends. When investors decide the AI trade is overvalued, the impact is magnified in Seoul, creating a ripple effect that can influence other Asian markets.
“The KOSPI index fell approximately 10% from a record high”
The sharp correction in the KOSPI highlights the fragility of the AI-driven bull market. By targeting Samsung and SK Hynix, investors are signaling that the 'hardware phase' of the AI boom may be reaching a valuation ceiling. This event suggests that future growth in the tech sector will likely depend on tangible revenue from AI services rather than the anticipation of chip demand.
