Strait of Hormuz Closed to Nearly All Non-Iran-Linked Vessels Amid Escalating Regional Tensions

The Strait of Hormuz, through which approximately 20 million barrels per day of crude oil historically flow—nearly one-third of global seaborne oil trade—has been restricted to nearly all non-Iran-affiliated shipping. According to maritime tracking data, over 95% of inbound and outbound commercial vessels not under Iranian control or protection have been rerouted or detained since March 7, 2026. The closure follows a series of coordinated actions by Iranian naval forces and allied militias, including the seizure of two tankers in the Gulf of Oman and the mining of key navigation channels. This event represents a systemic disruption in global energy infrastructure. The benchmark crude oil futures contract, CL=F, surged 18% to $118.60 per barrel within 72 hours, reflecting heightened supply risk. The S&P 500 Energy Sector ETF (XLE) dropped 7.3% as investors priced in potential production curtailments and logistics bottlenecks. Meanwhile, the CBOE Volatility Index (^VIX) climbed to 38.4, its highest level since late 2023, signaling a broad-based flight to safety. The closure has triggered immediate rerouting strategies, with tankers now navigating around the Cape of Good Hope, adding up to 14 days to transit times and increasing shipping costs by an estimated $15–20 per barrel. Major oil importers, including China, India, and Japan, have begun activating emergency reserves, while the U.S. Department of Energy confirmed the release of 1.5 million barrels from the Strategic Petroleum Reserve (SPR) in anticipation of sustained disruption. Market participants are now pricing in a 60% probability of a sustained supply shock lasting beyond 60 days, with implications for inflation, refining margins, and central bank policy. The event has also intensified defense readiness in the region, with U.S. Navy carrier strike groups deploying to the Arabian Sea and coalition forces conducting joint naval exercises in the Persian Gulf.