Korean Markets Plunge Amid Escalating Iran Tensions, Semiconductors Bear Brunt

South Korea's benchmark KOSPI index dropped 2.8% to close at 2,741.65, marking its steepest decline in over three months, as rising fears of regional conflict in the Middle East reshaped investor sentiment. The sell-off was concentrated in the technology sector, where semiconductor firms faced heightened scrutiny due to their exposure to global supply chains and energy-sensitive manufacturing processes. The downturn was driven largely by major chipmakers: Samsung Electronics shed 4.1%, while SK Hynix lost 5.3%. Both companies operate advanced fabrication plants reliant on stable energy inputs and international logistics, making them vulnerable to disruptions from oil market volatility and geopolitical instability. The S&P Korea Semiconductor Index plunged 6.7%, reflecting deep sector-wide risk aversion. Global crude oil prices reacted sharply, with Brent crude futures (CL=F) surging 8.4% to $94.12 per barrel, raising concerns about increased production costs for energy-intensive industries. The rally in oil prices coincided with Iran’s reported missile strikes on targets in Israel and allied regions, which triggered a broader risk-off mood in Asian equity markets. The decline in Korean equities also impacted related ETFs and foreign investment flows, with foreign investors selling $1.2 billion in Korean stocks over the past two trading sessions. Analysts noted that the semiconductor sector’s premium valuations make it especially sensitive to shifts in macro and geopolitical risk, and that a sustained escalation could delay capital expenditures and delay chip output timelines.