South Korean stocks plunged as Middle East tensions reignited fears of soaring energy costs, triggering a 4.1% drop in the Kospi Index during its post-holiday reopening. Defense and oil firms led gains amid geopolitical uncertainty, while airlines and automakers faltered due to anticipated fuel price hikes. The conflict in Iran—if prolonged—threatens to disrupt global supply chains and amplify inflationary pressures, testing Korea’s 2025 market resilience. Samsung Electronics and SK Hynix, key drivers of the Kospi’s rally, saw gains overshadowed by concerns over stretched valuations after tripling in 12 months. Analysts warn elevated crude prices could hinder the Federal Reserve’s easing plans, worsening risks for AI-linked equities reliant on stable rates.

Foreign investors intensified selling, offloading $2.3 billion in Kospi stocks by midday, pushing the South Korean won to a 1.9% decline—the worst Asian currency performance. Retail investors countered with net purchases, but institutional withdrawals dominated. The slump follows a $5 billion exit from Korean equities by global funds after a year-long rally, signaling profit-taking amid macroeconomic headwinds.

The Iran crisis underscores vulnerabilities in energy-dependent sectors, with oil majors benefiting from volatility. However, broader market weakness reflects anxiety over sustained geopolitical risks. With the won weakened and foreign capital fleeing, policymakers face pressure to stabilize investor confidence. Global Funds Dump Nearly $5 Billion of Korean Stocks After Rally highlights the fragility of recent momentum amid shifting risk appetites.