Oil shock from U.S.–Iran tensions and Strait of Hormuz closure weighs on global markets

Global markets today are being driven primarily by escalating geopolitical tensions in the Middle East and the resulting shock to energy prices. The U.S.–Iran conflict has intensified into its third week, with Iran striking key oil and natural gas infrastructure, including a Saudi refinery in the Red Sea, and prompting the closure of the Strait of Hormuz. This strait is one of the world’s most important oil shipping chokepoints, so its closure is disrupting expectations for global crude supply. Oil prices are surging as traders price in the risk of prolonged supply disruptions: U.S. crude has climbed to around $97 per barrel and Brent crude has jumped above $110. Higher energy costs feed directly into transportation, manufacturing, and consumer expenses, raising fears that inflation could re-accelerate just as many investors had been hoping for interest-rate cuts later this year. If inflation stays elevated because of expensive oil, central banks—especially the U.S. Federal Reserve—may be forced to keep rates higher for longer, which tends to pressure stock valuations and slow economic growth. These concerns are already showing up in equity markets. Major U.S. indices have moved lower, with the S&P 500, Dow, and Nasdaq all posting notable declines as investors reduce risk exposure and reassess the outlook for corporate profits under higher energy and financing costs. Beyond oil, markets are also worried about knock-on effects on global supply chains for metals, materials, food, and pharmaceuticals that move through or are priced off Middle Eastern trade routes. This combination of rising inflation risk, potential delays to rate cuts, and higher recession odds is the dominant force shaping global market sentiment today. Company-specific earnings surprises, such as strong results from some retailers and mixed reactions in the semiconductor sector, are having only localized effects and are not the main drivers of the broader market. The overarching theme for global investors today is geopolitical risk and its impact on energy prices, inflation expectations, and central bank policy paths.