Gulf blockade shocks markets

President Donald Trump said on Sunday, April 12, that the United States Navy would begin blockading ships entering or leaving the Strait of Hormuz after peace talks with Iran in Islamabad ended without a deal. (apnews.com) Trump said the blockade would start “immediately” and that the Navy would intercept vessels that paid Iran a toll for passage through the waterway. The White House said four days earlier that Iran had agreed to a ceasefire and to reopen the strait, but that broader peace terms were still under negotiation. (cbsnews.com (whitehouse.gov) The talks that collapsed were held over the weekend in Islamabad, Pakistan. Politico and Bloomberg reported that Trump announced the blockade in posts after the negotiations broke down. (politico.com) (bloomberg.com) The Strait of Hormuz is the narrow sea lane between the Persian Gulf and the Gulf of Oman. The United States Energy Information Administration said about 20 million barrels a day moved through it in 2024, equal to about 20% of global petroleum liquids consumption and more than one-quarter of global seaborne oil trade. (eia.gov) The passage is narrow enough that shipping lanes are concentrated in a small corridor. Encyclopaedia Britannica says the strait is 35 to 60 miles wide, while the main tanker lanes run mostly in Omani waters under international maritime law. (britannica.com) The energy stakes extend beyond crude. The Energy Information Administration said about 20% of global liquefied natural gas trade also moved through Hormuz in 2024, mostly from Qatar. (eia.gov) The market reaction began before United States trading opened. CNBC reported Trump’s blockade order as breaking news on Sunday, and other live market coverage said oil futures were up as much as 7% after the talks failed. (cnbc.com) (financialexpress.com) The price shock follows weeks of disruption, not a single surprise announcement. The United Nations said on April 8 that a shaky two-week ceasefire had raised hopes the strait would reopen after a period in which the waterway had already become a global flashpoint for ships, seafarers and fuel prices. (news.un.org) United States energy forecasters had already been modeling the economic fallout. The Energy Information Administration said on April 7 that its latest outlook assumed the conflict would not persist past April and that traffic through the strait would gradually resume, a sign that official forecasts were already hinging on a short disruption. (eia.gov) International agencies have warned that a prolonged closure would spread far beyond the Gulf. The International Monetary Fund said on March 30 that the de facto closure of Hormuz and damage to regional infrastructure had produced the largest disruption to the global oil market in its history and acted like a sudden hit to income for fuel-importing economies. (imf.org) What traders watch next is whether the Navy tries to enforce Trump’s order on commercial shipping and whether Iran responds at sea. That decision, more than the Sunday posts themselves, will determine whether the weekend oil spike turns into a broader shock for fuel, freight and stock markets when futures trading resumes. (apnews.com) (eia.gov)