Hormuz Day 5: Clubs Cancel War-Risk Extensions, The Strait Is Now Commercially Closed

Situation Update

The Strait of Hormuz is no longer merely physically closed. As of today, it is commercially closed. Six of the thirteen members of the International Group of P&I Clubs issued formal notices cancelling the non-poolable charterers’-liability war-risk extensions for the Persian Gulf, effective March 5, several on roughly seven days’ notice. The six clubs collectively cover over 80% of the world’s ocean-going tonnage. Crucially, the poolable P&I cover and the statutory CLC/Bunkers Convention “blue cards” are non-cancellable and reinsured in London; they did not lapse, and ships did not lose their blue cards. What lapses is the charterers’ war-risk extension, and with it goes any charterer’s willingness to fix a vessel into the Gulf. In parallel, hull war-risk additional premiums have surged from roughly 0.2% of hull value to around 1.5-5%, a swing that by itself prices out most voyages.

The closure is now self-sustaining. Iran’s navy has been decimated; CENTCOM reports over 20 Iranian naval vessels destroyed in five days of operations. But the drone and fast attack craft threat remains active, and the insurance market has now done what the IRGC alone could not: made the closure hold until the risk assessment changes. Normalizing the war-risk market after a war-zone listing is not a switch that flips overnight. Historical precedent from the Iran-Iraq Tanker War (1984-1988) suggests it takes 6-8 weeks after hostilities cease, requiring new surveys, updated risk models, reinstated charterers’ extensions, and board-level approvals at each club.

The air campaign continued to intensify, with CENTCOM reporting cumulative strikes now exceeding 2,500. Iran’s integrated air defense network has been significantly degraded, and the IRGC’s conventional missile launch capability is estimated at roughly 50% of its pre-war capacity. Iran responded with a fresh barrage of ballistic missiles targeting Saudi oil infrastructure near Dhahran and Ras Tanura, though Saudi Patriot batteries intercepted the majority. The symbolic targeting of oil facilities signals Iran’s strategic calculus: if they cannot export oil, neither will the Gulf states.

Market Data

Metric	Day 4 (Mar 4)	Day 5 (Mar 5)	Change
Brent Crude	~$93/bbl	~$97/bbl	+$4 (+4.3%)
WTI Crude	~$89/bbl	~$93/bbl	+$4 (+4.5%)
Hormuz Oil Flow	0 bbl/day	0 bbl/day	Day 5 of closure
Charterers’ Extensions	Advisory warnings	6 clubs cancelled	De facto closure
Hull War-Risk Premium	~0.2% hull value	~1.5-5% hull	Pricing out voyages
VLCC Day Rate	$140K/day	$185K/day	+32%
Ships Anchored	100+	120+	Growing
Iran Missiles Expended	N/A	~500+ total	Inventory declining

Insurance as a Weapon

The war-risk repricing is the single most consequential development since the Strait closed on Day 2. Military analysts and energy traders have spent decades modeling Hormuz closure as a kinetic event: missiles sinking tankers, mines blocking channels, naval battles in the shipping lanes. The reality is more mundane and more durable. The closure is enforced by underwriters in London, not admirals in Bandar Abbas. Note what this is not: core P&I cover and the statutory blue cards remain in force throughout. The bite comes from prohibitive hull war-risk premiums plus the cancelled charterers’ extensions, not from any lapse of mandatory cover.

This creates an asymmetry that no military operation can resolve. The US Navy could theoretically sweep the Strait of every Iranian drone and fast boat within 72 hours. It could destroy every coastal launch site and neutralize every remaining IRGC vessel. And the Strait would still be closed, because underwriters will not normalize war-risk pricing or reinstate charterers’ extensions while any residual risk exists, and in a war zone, residual risk is definitional. The precedent from the 1987-88 Tanker War is instructive: even after US Navy escorts proved highly effective, the insurance market took months to normalize. Commercial traffic resumed only gradually, and many operators simply routed around the Gulf entirely via the Cape of Good Hope.

The $97 Brent print reflects the market beginning to price in duration, not just disruption. A one-week closure is a spike-and-recovery event. A multi-week closure with a months-long insurance tail reprices the entire global energy complex. Asian refiners configured for Arab Heavy and Basra Medium cannot easily substitute lighter crudes from the Atlantic basin. The mismatch between available supply and refinery configurations is a second-order constraint that will manifest as product-specific shortages (diesel, jet fuel) even before crude runs out.

What to Watch

1. US reinsurance intervention: The US Development Finance Corporation (DFC) has emergency authority to backstop war-risk coverage. A government reinsurance facility, essentially taxpayer-backed war-risk coverage for Gulf transits, would be the only mechanism to reopen the Strait before the commercial war-risk market normalizes and charterers’ extensions are reinstated.
2. Pentagon cost disclosures: The CSIS estimate of $891M/day is widely considered conservative. Expect revised figures from the Pentagon or independent analysts showing the campaign approaching $1 billion per day.
3. Iranian missile targeting patterns: The shift to targeting Saudi oil infrastructure (Dhahran, Ras Tanura) signals escalation. A successful strike on a major loading terminal would compound the supply loss from Hormuz closure.
4. China’s diplomatic posture: Beijing has 55+ vessels trapped in the Gulf and is the world’s largest crude importer. A Chinese mediation initiative is increasingly likely. Watch for envoy dispatches or UN Security Council action.
5. Kuwait and Iraq production: Both countries export almost exclusively through Hormuz. With no outlet, they face forced production shutdowns within days, creating supply losses that persist even after the Strait reopens.

Sources

• International Group of P&I Clubs: Charterers’ war-risk extension cancellation notices (Mar 5)
• Lloyd’s List: War-risk market analysis, VLCC rates (Mar 5)
• CENTCOM: Operational update, cumulative strike count (Mar 5)
• Fars News Agency: Iranian munitions expenditure reporting
• S&P Global Commodity Insights: Brent pricing, freight data
• Argus Media: Gulf state oil infrastructure targeting reports