Strait of Hormuz Blockade: The Flow Numbers That Matter

The scale of the disruption is stark. Since the war began on February 28, just 21 tankers have transited the Strait of Hormuz, a collapse from the more than 100 ships daily that used to pass through. This represents a 95% plunge in traffic, with the chokepoint grinding to a near halt on some days. The result is a massive backlog, with roughly 400 vessels stranded in the Gulf of Oman, creating a critical bottleneck for global energy flows.

Iran's control is not blanket but selective. The regime is permitting safe passage for a small number of vessels, signaling a negotiated, toll-based system. This includes an Indian liquefied petroleum gas (LPG) carrier and dozens of vessels broadcasting Chinese ownership or crew presence. The pattern suggests an informal filter, where ships signal neutrality to avoid targeting.

The setup is formalizing into a vetting regime. Iran is reportedly developing a new vetting and registration system for ships, with countries like India, Pakistan, and China in direct talks. Ships must communicate extensive details about ownership and cargo to the Revolutionary Guard Corps in advance. Early reports indicate at least one tanker paid a $2 million fee for passage, marking a clear shift from a total blockade to a controlled, revenue-generating chokepoint.

Insurance Premium Surge

The immediate financial burden on shipping is now quantifiable. Insurance premiums for vessels navigating the Strait have surged to about 5% of a ship's value, a fivefold increase from pre-conflict levels. This translates to a direct cost of roughly $5 million to insure a $100 million oil tanker. The steep price signals that coverage remains available for the handful of vessels still moving, but it creates a massive new cost barrier.

Market expectations are clear: the probability of a closure in the second quarter is 100%. The key uncertainty is the duration of this toll. With the U.S. announcing a $20 billion reinsurance program to help revive shipping, the focus is on whether this support can offset the private market's risk pricing. For now, the premium surge is a direct, material cost that must be paid for any vessel to attempt passage.

The setup is a controlled, high-cost chokepoint. Insurers are quoting rates primarily for vessels with links to China, India, or Pakistan, indicating a vetted flow. The bottom line is that global energy flows are now subject to a new, explicit fee-a $2 million fee for passage has already been reported-alongside these exorbitant insurance premiums. This dual-layered toll is the financial reality of shipping through a war zone.

Oil Price and Economic Impact

The direct market reaction is clear. In response to the disruption fears, Brent crude prices have risen above $90 per barrel. This move reflects the immediate supply shock from a chokepoint that carries roughly one-fifth of global oil trade. The price action is a pure flow signal: the market is pricing in a significant, near-term reduction in seaborne supply.

The broader economic impact is a transmission of costs. Higher energy prices ripple through the system, increasing food costs and intensifying cost-of-living pressures. This happens because the Strait also moves critical fertilizers and transport fuel. The result is a broad-based inflationary push, hitting vulnerable economies hardest. The shock comes at a bad time, as many developing nations already struggle with debt and limited fiscal room to absorb new price spikes.

Crucially, the supply chain reality is one of locked-in commitments. Maritime supply chains are planned months in advance, meaning immediate route adjustments are impossible. The impacts are "baked in" already. Even if the vetting system stabilizes tomorrow, the physical flow of goods is already delayed or rerouted, propagating costs through global trade for weeks. The economic flow is now set on a higher-cost path.