Iran War Drains Global Oil Supplies, Strait of Hormuz Flows Drop 30% YoY

The ongoing conflict between the US and Iran has triggered a seismic energy shock that is now rippling through global financial conditions. According to the US Energy Information Administration, flows of crude oil and refined fuels through the Strait of Hormuz fell by nearly 30 percent in the first quarter of 2026, a drop equivalent to roughly 6 million barrels per day. This represents one of the largest disruptions to global energy supply in modern history, comparable to the 1973 OPEC embargo in relative terms.

The supply shock has lifted Brent crude and regional energy prices, raising inflationThe rate at which prices rise across an economy. expectations across developed and emerging markets. Turkey's central bank revised its year-end inflation target upward, explicitly citing the war's impact on oil prices and energy input costs. Poland's economy slowed in Q1 2026 partly due to elevated energy costs limiting construction activity. India has asked the US to extend a Russian oil import waiver as the disruption forces New Delhi to seek alternative energy sources. Energy importers from Europe to Asia now face acute margin pressure as fuel costs cascade through their supply chains.

The geopolitical dimension adds urgency. Iranian officials have seized commercial vessels, including a British-flagged ship in the Gulf of Oman, heightening insurance costs and deterring transit. US efforts to broker a ceasefire have stalled after the latest seizure. The Trump administration's posture is to stabilize energy markets while maintaining strategic pressure, a balancing act reflected in the Beijing summit's focus on energy cooperation (Xi Jinping told Trump he is interested in purchasing more US oil to reduce Middle East dependence).

For financial markets, the inflationThe rate at which prices rise across an economy. shock is the critical lever. If crude prices remain elevated through the summer, central banks will face a dilemma: cut rates to support growth as energy crunches demand, or hold rates to combat sticky inflation. The ECB in particular faces this tension. Governing Council member Martins Kazaks stated the ECB will hike rates if oil prices deanch inflation expectations. Energy companies and defence contractors benefit from the elevated risk premium, while airlines, retailers, and margin-sensitive industries suffer. Airlines including Air New Zealand and Sapporo Holdings have already cut guidanceCompany-issued forecasts of future financial performance. due to fuel costs.