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Seoul, July 25, 2026 – South Korea’s benchmark Kospi index suffered its sharpest single day decline in years on July 24, tumbling more than 400 points as escalating U.S. Iran tensions and mounting concerns over the semiconductor cycle triggered a wave of panic selling.
The rout erased a three-day rally and underscored the vulnerability of Asia’s fourth largest economy to global shocks.
The Kospi closed at 6,690.62, down 406.27 points or 5.72 percent, after touching an intraday low of 6,650.41.
The scale of the drop forced a temporary suspension of program trading early in the session, a rare move that highlighted the intensity of investor anxiety.
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Market breadth was deeply negative, with decliners outnumbering gainers by nearly two to one.
Turnover surged to 30.9 trillion won, reflecting the sheer volume of liquidation.
Foreign and institutional investors led the sell off, unloading a combined 5.2 trillion won worth of shares.
Retail investors stepped in to absorb 5.18 trillion won, but their buying was insufficient to stem the tide.
Analysts noted that while domestic investors remain confident in the long term outlook, the exodus of foreign capital raises questions about South Korea’s resilience in the face of geopolitical instability.
The immediate catalyst was U.S. President Donald Trump’s warning of a “major attack” on Iran, which reignited fears of conflict in the Middle East.
The geopolitical shock coincided with growing doubts that the semiconductor supercycle has peaked, sending heavyweight chipmakers into freefall.
Samsung Electronics plunged 7.59 percent to 249,500 won, while SK hynix dropped 8.34 percent to 1,759,000 won.
Other sectors joined the slide. Hyundai Motor fell 7.18 percent, KB Financial lost 2.72 percent, and HD Hyundai Heavy Industries dropped 2.51 percent.
Yet amid the carnage, biotech stocks offered a rare bright spot.
Samsung Biologics surged 10.08 percent after reporting strong earnings, while Celltrion gained 3.14 percent, underscoring the divergence in sectoral momentum.
Currency markets showed limited contagion, with the Korean won firming slightly to 1,466.6 per U.S. dollar.
Bond yields, however, edged higher, with the three year Treasury yield climbing 4.2 basis points to 3.959 percent and the five-year yield rising 5 basis points to 4.214 percent, signaling tightening liquidity conditions.
The Kospi’s collapse illustrates the fragility of investor sentiment in a market heavily reliant on semiconductor exports.
While retail investors’ willingness to buy on weakness suggests underlying confidence, the scale of foreign outflows points to heightened risk aversion.
Analysts warn that further escalation in the Middle East could deepen volatility across Asian equities.
Looking ahead, investors will closely monitor developments in U.S. Iran relations and earnings guidance from chipmakers to gauge whether the downturn marks a temporary correction or the start of a prolonged slump.
The resilience of biotech stocks may provide some cushion, but the broader market remains exposed to external shocks.
The Kospi’s dramatic reversal serves as a reminder that in an interconnected global economy, geopolitical tremors can swiftly reverberate through financial markets, reshaping risk appetite and testing the resolve of investors.
