The Insurance Weapon: How Six P&I Clubs Closed the Strait of Hormuz

Date: March 10, 2026 Type: WEEKLY DEEP DIVE Reading Time: ~8 min Panels: Maritime Analyst, Macro-Economist, Historian

TL;DR

• Six Protection & Indemnity clubs withdrew war-risk coverage for Hormuz transit on March 5, converting a military confrontation into a commercial blockade more effective than any naval force could impose.
• War-risk premiums surged from 0.2% to 1% of hull value, pushing per-voyage insurance costs from $200K to over $1M, and total freight economics from $900K to $4M+ per ship, making transits commercially irrational even if physically possible.
• The insurance mechanism has closed the strait faster and more completely than Iran’s drones alone could achieve: daily transits collapsed from 138 to 2-3, with 200+ vessels anchored and VLCC day rates at an all-time $423,736.
• Historical precedent from the Tanker War (1984-88), Suez 1956, and the Gulf War shows that insurance withdrawal is the fastest transmission mechanism between military action and trade disruption, and the slowest to reverse.

Six Circulars, One Morning

At 00:01 GMT on March 5, 2026, the London market woke up to six simultaneous circulars. Gard, Skuld, NorthStandard, London P&I, American Club, and Steamship Mutual, collectively insuring roughly 80% of the global oceangoing fleet, cancelled war-risk coverage for all transits of the Strait of Hormuz and the Persian Gulf north of 26°N latitude.

The circulars were not coordinated in the collusive sense. They did not need to be. Each club’s loss committee ran the same math independently and arrived at the same conclusion. By March 5, Day 5 of Operation Epic Fury, ten commercial vessels had been attacked by Iranian kamikaze drones. Seven crew members were dead. The IRGC had declared the strait closed (while the Foreign Ministry, in characteristically contradictory fashion, denied any formal closure). Lloyd’s Joint War Committee had already added the Persian Gulf to its Listed Areas, triggering automatic war-risk premium surcharges. The clubs simply followed the data.

The premium math tells the story. A standard VLCC (a Very Large Crude Carrier, the workhorses of Gulf oil trade) carries a hull value of approximately $100 million. Pre-crisis, war-risk insurance for a Hormuz transit ran at roughly 0.2% of hull value: $200,000 per voyage. This was already elevated from the near-zero rates of peacetime; the 2024-2025 Houthi campaign in the Red Sea had been slowly repricing Gulf-adjacent risk. But on March 5, the remaining underwriters willing to quote Hormuz transits moved to 1% of hull value: $1 million per voyage. A fivefold increase. And that was the price for the brave or the foolish; most underwriters simply declined to quote at all.

For a shipowner, the voyage economics disintegrated overnight. Pre-crisis, a VLCC loading 2 million barrels at Ras Tanura and delivering to Ningbo carried total freight costs of approximately $900,000. Post-March 5, the same voyage (assuming you could find a willing insurer) cost $4 million or more. Factor in the all-time-high VLCC day rate of $423,736 (Lloyd’s List, March 7), and even a single day of delay in the anchorage queue burns nearly half a million dollars. No charterer could justify the exposure. No shipowner would risk an uninsured $100 million asset in a war zone for a margin that no longer existed.

The result was instantaneous. Daily vessel transits through the Strait of Hormuz dropped from an average of 138 to just 2-3, and those residual transits were almost exclusively military vessels, government-chartered emergency supply runs, or the rare rogue operator willing to sail without cover. Over 200 commercial vessels sat anchored in the Gulf of Oman, the Arabian Sea, and the Fujairah roads, waiting for a resolution that might take weeks or months. Twenty million barrels per day of oil flow dropped to effectively zero.

How Insurance Closes a Strait

To understand why this matters, and why it may matter more than Iran’s drones, you have to understand the legal architecture of maritime trade. Every commercial vessel sailing international waters carries three layers of insurance: hull and machinery (H&M), which covers the physical vessel; Protection and Indemnity (P&I), which covers third-party liabilities including crew injury, pollution, and collision; and cargo insurance, which covers the goods aboard. War-risk is a separate overlay, typically purchased as an add-on to the H&M policy, that covers losses arising from acts of war, terrorism, mines, and, critically, drone attacks.

When P&I clubs withdraw war-risk coverage, the cascade is mechanical and unstoppable. Without valid P&I cover, a vessel cannot enter most ports, since port state authorities require proof of insurance. Without war-risk on the H&M policy, the owner’s mortgage lender (almost every large vessel is financed) can declare a default, since the loan covenant requires the vessel to be fully insured at all times. Without cargo insurance, no shipper will load cargo. Each link in the chain is load-bearing; sever any one, and the transit becomes impossible regardless of whether the captain and crew are willing to sail.

The insurance mechanism is more effective than a traditional naval blockade. A naval blockade requires warships, sustained patrol, and the political will to fire on violators. It is expensive, diplomatically provocative, and legally complex under international maritime law. An insurance withdrawal requires nothing more than a risk committee meeting and a circular email. It is invisible to the public, immune to diplomatic protest, and enforced not by gunboats but by mortgage covenants and port authorities.

Iran’s IRGC understands this. The drone attacks on commercial shipping were never intended to sink the global tanker fleet (that would require thousands of drones and would invite a decisive military response). They were intended to generate precisely enough loss events to trigger the insurance withdrawal. Ten ships attacked. Seven crew killed. Six P&I clubs out. Mission accomplished, at a cost of perhaps a few hundred Shahed-type drones valued at $20,000-50,000 each. The total investment: perhaps $5-10 million in drone hardware to shut down $2 trillion in annual oil trade. It is, by any measure, the highest return-on-investment military operation in modern history.

Historical Precedent

The insurance weapon has been deployed before, never at this scale, but the mechanism is well-established.

The Tanker War (1984-1988). During the Iran-Iraq War, both belligerents attacked oil tankers in the Persian Gulf. Iran targeted Kuwaiti and Saudi-flagged vessels supporting Iraq; Iraq targeted Iranian oil exports from Kharg Island. Over four years, 451 ships were attacked and over 400 seamen killed. Lloyd’s war-risk premiums for Gulf transits surged to 1-2% of hull value at peak, comparable to current rates. But the Tanker War never fully closed the strait. Transits declined by roughly 25-30%, not 98%. The critical difference: in the 1980s, attacks were sporadic and geographically diffuse, conducted by aircraft and patrol boats that could be deterred by convoy escorts. The US reflagging operation of 1987, placing Kuwaiti tankers under American flags with Navy escorts, restored confidence and brought premiums back down within months. Today’s drone-based closure mechanism operates on different economics entirely. Drones are cheap, expendable, and difficult to intercept at scale. Escort convoys reduce risk but cannot eliminate it, which is why the insurance market has not yet responded to the French carrier group deployment with reinstated coverage.

Suez Crisis (1956). When Egypt nationalized the Suez Canal and the subsequent Anglo-French-Israeli invasion followed, the canal was physically blocked by scuttled ships. But even before the blockage, marine insurers had withdrawn coverage for canal transits. The insurance withdrawal preceded the physical closure by approximately 48 hours, demonstrating that the market moves faster than military reality. Post-crisis, it took four months to clear the canal of wrecks, but insurance coverage was restored within weeks of a ceasefire, once the UN Emergency Force established a security perimeter. The lesson: insurance withdrawal is fast in, slow out, but responds to credible security guarantees.

Gulf War (1990-91). Iraq’s invasion of Kuwait and the subsequent coalition war triggered insurance withdrawal for the entire northern Persian Gulf. Lloyd’s Listed Areas expanded to cover all waters north of 29°N. Premiums spiked, but the disruption was shorter because the coalition established air and naval supremacy rapidly. The strait itself was never threatened; only the loading terminals in Kuwait and northern Saudi Arabia. Insurance was restored within weeks of the ceasefire. The current crisis is more severe because the closure mechanism targets the strait itself, the 21-mile-wide chokepoint through which all Gulf traffic must pass, rather than terminals that can be bypassed.

How this time is different. In every prior case, the insurance market withdrew coverage in response to state-on-state military action and restored it when a credible security framework (UN force, coalition naval supremacy, or ceasefire) was established. The current crisis has no historical parallel, differing in three dimensions: (1) the closure mechanism is asymmetric and low-cost, meaning Iran can sustain it without conventional military superiority; (2) the scope is total, with 100% of strait traffic affected, not a subset of flagged vessels; and (3) no credible security framework exists yet. The French escort coalition is deploying but unproven. The US $20 billion reinsurance plan (DFC, announced March 6) is a political signal, not a market instrument. No P&I club will reinstate coverage based on a government backstop until escorted convoys demonstrate a track record of safe passage.

By the Numbers

Metric	Pre-Crisis (Feb 2026)	Post-Withdrawal (Mar 10)	Change
War-risk premium (% of hull)	~0.2%	1%+ (where quoted)	+400%
Per-voyage war-risk cost (VLCC)	~$200,000	$1,000,000+	+400%
Total freight cost (VLCC, Gulf→Asia)	~$900,000	$4,000,000+	+344%
VLCC day rate	~$35,000-55,000	$423,736 (record)	+670-1,110%
Hull value (standard VLCC)	~$100,000,000	~$100,000,000	Unchanged
Daily Hormuz transits	~138 (avg)	2-3	-98%
Vessels anchored waiting	~10-20 (normal)	200+	+900-1,900%
Oil flow through Hormuz	~20M bbl/day	~0 bbl/day	-100%
Brent crude	~$73/bbl (Feb avg)	~$110/bbl	+50.7%

The per-voyage economics deserve closer examination. Consider a VLCC loading 2 million barrels of Arab Heavy at Ras Tanura, bound for Ningbo, China, the single most common trade on earth before March 2026.

Pre-crisis voyage cost stack:

• Freight (time charter equivalent): ~$500,000
• War-risk insurance: ~$200,000
• Bunker fuel: ~$150,000
• Port charges and canal fees: ~$50,000
• Total: ~$900,000 ($0.45/barrel)

Post-withdrawal voyage cost stack (if insurable):

• Freight (spot market at record rates): ~$2,500,000+
• War-risk insurance: ~$1,000,000+
• Bunker fuel: ~$200,000 (fuel price inflation)
• Port charges: ~$50,000
• Risk premium / crew bonus: ~$250,000+
• Total: ~$4,000,000+ ($2.00/barrel)

That $1.55/barrel increase in transportation cost is already embedded in the $110 Brent price. But the real cost is not the $1.55; it is the zero. Zero barrels are moving. The freight market is pricing a theoretical transit that no one is actually making. The true cost of a barrel of Gulf crude delivered through Hormuz today is infinity, because no barrel is being delivered.

Who Benefits

Every disruption creates winners. The Hormuz insurance withdrawal has reshuffled maritime risk geography in ways that will persist long after the strait reopens.

Alternative route operators. Tankers on Atlantic Basin routes (West Africa to Europe, US Gulf to Asia via Cape of Good Hope) are commanding premium rates as refiners scramble for non-Hormuz-dependent crude. The Cape route from the Arabian Sea to Europe adds 10-15 days versus Suez, but it avoids both Hormuz and the Houthi-threatened Bab el-Mandeb, making it the safest option for Gulf-origin crude loaded at Fujairah via the UAE bypass pipeline.

Russian crude and the sanctions arbitrage. Russia’s seaborne crude exports, already operating under a Western price cap and shadow fleet insurance, have suddenly become the most competitively insured barrels in the market. Russian crude does not transit Hormuz. The “shadow fleet” already operates outside the P&I club system, using opaque insurers in Dubai, Mumbai, and Hong Kong. India has surged Russian crude purchases to 1.37 million barrels per day, up 30% from February. Urals crude has flipped from a $13/bbl discount to a $4-5/bbl premium on a delivered basis. The insurance weapon designed to close Hormuz is inadvertently financing Russia’s war economy.

Red Sea risk repricing. Saudi Arabia’s bypass strategy, tripling Red Sea exports via Yanbu to 2.5 million barrels per day, has created a new insurance flashpoint. Yanbu-loaded tankers must transit the Bab el-Mandeb strait, where Houthis have demonstrated persistent anti-ship capability with Iranian-supplied drones and missiles. War-risk premiums for Red Sea transits, already elevated from the 2024-2025 Houthi campaign, are now climbing further as higher-value VLCC cargoes make these tankers more attractive targets. The P&I clubs have not withdrawn Red Sea coverage yet, but the Listed Area designation remains in effect. If Houthis escalate attacks on Yanbu-loaded tankers, the insurance weapon could close the Saudi bypass route and collapse the only significant workaround to the Hormuz closure.

Northern Sea Route. The Arctic route from Russia’s Pacific coast to East Asia, historically a niche passage open only in summer months, is attracting speculative interest as a Hormuz-independent pathway. Chinese and Russian state shippers have expanded icebreaker capacity in recent years. The route is currently ice-bound and will not be viable until June-July, but if the Hormuz crisis extends into Q3 2026, expect accelerated investment in Arctic shipping infrastructure and insurance products.

What to Watch

1. P&I club conditional reinstatement: The earliest signal of reopening will come not from diplomats but from insurance committees. Watch for Gard or Skuld issuing circulars offering conditional war-risk coverage for escorted convoys. This will likely require a demonstrated track record of 3-5 successful French/coalition escort transits with zero incidents. Until then, the strait remains commercially closed regardless of military developments.

2. Lloyd’s Joint War Committee Listed Area revision: The JWC meets regularly to review Listed Areas. A narrowing of the Persian Gulf exclusion zone (for example, limiting it to the strait narrows rather than the entire Gulf north of 26°N) would signal that underwriters see a pathway to partial reopening. Conversely, an expansion to include the Gulf of Oman would signal escalation.

3. US DFC reinsurance plan activation: The $20 billion reinsurance facility announced March 6 is currently a policy instrument, not a market one. Watch for the first actual policy written under this facility. If major charterers begin accepting DFC-backed coverage as a substitute for commercial war-risk, it could break the insurance deadlock, though P&I clubs may refuse to accept government reinsurance as equivalent to commercial coverage.

4. VLCC day rate trajectory: The current $423,736/day all-time high reflects panic demand for non-Hormuz tonnage. A sustained move above $500,000/day signals the market is pricing a multi-month closure. A decline toward $300,000/day would indicate traders believe reopening is approaching.

5. Crew willingness to sail: The least quantifiable but most human indicator. Seven crew members have been killed. Maritime unions, particularly the International Transport Workers’ Federation (ITF), have the ability to declare the strait a no-go zone for crew safety reasons, independent of insurance status. If the ITF issues a formal advisory, it creates a third enforcement mechanism beyond drones and insurance: labor refusal.

Sources

• Lloyd’s List: VLCC day rates ($423,736 record), traffic data, vessel attack reporting
• P&I club circulars: Gard, Skuld, NorthStandard, London P&I, American Club, Steamship Mutual (war-risk withdrawal, effective Mar 5)
• Lloyd’s Joint War Committee: Listed Area designations, Persian Gulf
• IMO: vessel attack reports, crew casualty data (10+ ships attacked, 7 killed)
• Kpler: vessel anchoring data (200+ ships, Mar 8)
• Argus Media: tanker traffic decline (90-94%, Mar 7)
• Bloomberg, Al Arabiya: Saudi Red Sea export data (786K to 2.5M bbl/day)
• CENTCOM: strike counts (3,000+ by Day 7)
• US DFC: $20B reinsurance plan announcement (Mar 6)
• USNI/France24: French escort coalition composition (Mar 9)
• TankerBrief Crisis Situation Report v2 (2026-03-10): baseline data
• Historical references: Lloyd’s of London archives (Tanker War premiums, 1984-88); Suez Crisis shipping records, 1956; Gulf War maritime insurance data, 1990-91