Kospi Crashes 6%, Down 25% From June Peak as Gulf Tensions and Oil Spike Rattle Asia

The Quick Take

• South Korea's Kospi index plunged 6% on Monday, extending its decline to 25% below its June 2026 peak and entering bear market territory.
• AI chip heavyweights SK Hynix and Samsung Electronics led the Kospi selloff as Gulf tensions drove oil prices sharply higher.
• Rising US-Iran conflict fears and a 4%+ oil price spike rattled Asian markets simultaneously, creating a dual headwind for energy-importing economies.
• Despite the correction, Kospi remains the world's best-performing major stock index in 2026 year-to-date.

South Korea's Kospi index, which had soared through the first half of 2026 on AI chip euphoria, experienced a sharp risk-off correction as Gulf tensions and surging oil prices reminded investors that macro vulnerabilities can override sector momentum. The selloff was led by SK Hynix and Samsung Electronics — the two largest index components and primary beneficiaries of the AI memory upgrade cycle — whose valuations had stretched to multi-year highs before this sudden reversal pushed the benchmark 25% below its June peak and firmly into bear market territory.

The Kospi decline carries broader regional implications: South Korea is a major energy importer, making oil-spike-induced margin compression a near-term earnings risk for industrials, airlines, and chemical companies. SK Hynix's correction cascades into global semiconductor sentiment, creating downward pressure on TSMC, Micron, and NVIDIA as investors reassess AI hardware capex timelines. Samsung's decline similarly pressures consumer electronics supply chains across Southeast Asia and creates a negative read-through for component suppliers in Japan, Taiwan, and India.

Watch South Korea's July CPI print for any upside surprise from oil price pass-through that might delay Bank of Korea rate cuts — a key supportive variable for export-driven equity valuations. The macro variable is the pace of Gulf tension de-escalation: a prolonged oil supply disruption sustaining prices above $90 per barrel could tip Korean corporate margins negative in Q3, forcing earnings downgrades that extend the Kospi bear market well into the second half and ripple through India-linked semiconductor and EV battery supply chains.

Synthesized from 1 source.