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

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

TL;DR

• Seven Protection & Indemnity clubs withdrew war-risk coverage for Hormuz transit, converting a military confrontation into a commercial blockade more effective than any naval force could impose.
• War-risk premiums surged from 0.2% to 5-10% of hull value, pushing per-voyage insurance costs from $200K to $5-10M for a $100M vessel. Freight costs per barrel hit $12-15, up from $2-3 pre-crisis. VLCC day rates exceeded $1 million per day.
• The insurance mechanism has closed the strait faster and more completely than Iran’s drones alone could achieve: daily transits collapsed from 138 to 10-20, with 800+ vessels trapped and 22+ ships attacked across 40 days of war.
• On April 7, a Pakistan-brokered two-week ceasefire was announced. Oil crashed. But the insurance blockade persists. Maersk’s response: “does not yet provide full maritime certainty.” Seven P&I clubs remain withdrawn. Mines are active. No blue cards available. The insurance weapon has outlasted the military campaign — exactly as this article’s thesis predicted.

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. A seventh club followed within days, bringing the withdrawal to seven of the thirteen International Group members.

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.

Over the next five weeks, that data got worse. By Day 40 of the closure, 22+ ships had been attacked. The Al-Salmi, a fully laden Kuwaiti VLCC, was struck by an Iranian drone at Dubai anchorage on March 31 — the first loaded tanker hit at a major port, extending the threat envelope to every vessel in the Gulf, including those not attempting transit. Forty-eight hours later, the Aqua 1 was hit in Qatar’s territorial waters. On April 4, IRGC claimed a strike on MSC Ishyka in Hormuz itself — a claim debunked by AIS data showing the vessel moored at Bahrain’s Khalifa Bin Salman Port, but the false claim alone spooked underwriters.

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. By early March, the remaining underwriters willing to quote moved to 1% of hull value: $1 million per voyage. A fivefold increase. By early April, after the Al-Salmi and Aqua 1 attacks, premiums surged to 5-10% of hull value: $5-10 million per transit for a $100M vessel. A twenty-five to fiftyfold increase from pre-crisis rates. 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 and kept disintegrating. Pre-crisis, a VLCC loading 2 million barrels at Ras Tanura and delivering to Ningbo carried total freight costs of approximately $900,000. By Day 40, the same voyage (assuming you could find a willing insurer) costs in multiples that would have been absurd six weeks ago. VLCC day rates exceeded $1 million — not the $423,736 record that stunned the market in early March, but a figure more than double that. A round-trip Yanbu-to-Rotterdam cargo now approaches $40-50 million. Freight cost per barrel has hit $12-15, up from $2-3 in peacetime. 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 and has only deepened. Daily vessel transits through the Strait of Hormuz dropped from an average of 138 to 10-20 under Iran’s selective blockade regime, and those residual transits are almost exclusively whitelisted nations (Pakistan, India, China, Japan) or government-chartered emergency supply runs. Over 800 commercial vessels now sit trapped in the Gulf of Oman, the Arabian Sea, the Fujairah roads, and Gulf anchorages — four times the 200+ figure from early March. Twenty million barrels per day of oil flow dropped to effectively zero for Western-flagged shipping.

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. Twenty-two ships attacked. Seven 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 $10-20 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. The IRGC even demonstrated escalation dominance: the Al-Salmi strike at Dubai anchorage proved that no vessel in the Gulf was safe, not just those attempting transit. The Aqua 1 hit in Qatari waters extended the threat to the territory of a nation Iran considers a “neighbor and friend.” The message to underwriters was unmistakable.

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 — not even after a ceasefire. The French escort coalition deployed but remains unproven. The US reinsurance facility was doubled to $40 billion on April 6 with eight partners (DFC, Chubb as lead underwriter, plus AIG, Berkshire Hathaway, Travelers, Liberty Mutual, Starr, and CNA), but P&I clubs still refuse to accept government reinsurance as equivalent to commercial coverage. The facility insures the steel, not the voyage. No blue cards are available regardless of hull coverage, and without blue cards, no port will accept the vessel. Even the April 7 ceasefire has not moved the needle: Maersk’s immediate response — “does not yet provide full maritime certainty” — is the market’s verdict in six words.

By the Numbers

Metric	Pre-Crisis (Feb 2026)	Day 10 (Mar 10)	Day 40 (Apr 8)	Change (Feb→Apr)
War-risk premium (% of hull)	~0.2%	1%+	5-10%	+2,400-4,900%
Per-voyage war-risk cost (VLCC)	~$200,000	$1,000,000+	$5-10M	+2,400-4,900%
Total freight cost (VLCC, Gulf→Asia)	~$900,000	$4,000,000+	$40-50M (Yanbu-Rotterdam round-trip)	+4,344%+
Freight cost per barrel	~$2-3	~$4-5	$12-15	+400-650%
VLCC day rate	~$35,000-55,000	$423,736 (record)	$1,000,000+	+1,700-2,760%
Hull value (standard VLCC)	~$100,000,000	~$100,000,000	~$100,000,000	Unchanged
Daily Hormuz transits	~138 (avg)	2-3	10-20 (selective blockade)	-86-93%
Vessels trapped/waiting	~10-20 (normal)	200+	800+	+3,900-7,900%
Ships attacked (total)	—	~10	22+	—
P&I clubs withdrawn	0	6	7	—
Oil flow through Hormuz	~20M bbl/day	~0 bbl/day	Ceasefire; conditional	-100% (pre-ceasefire)
Brent crude	~$73/bbl (Feb avg)	~$110/bbl	~$94/bbl (post-ceasefire crash)	+28.8%
US reinsurance facility	—	$20B (DFC+Chubb)	$40B (8 partners)	+100%

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)

Day 40 voyage cost stack (if insurable at all):

• Freight (spot market at $1M+/day rates): ~$8,000,000+
• War-risk insurance (5-10% of hull): ~$5,000,000-$10,000,000
• Bunker fuel: ~$250,000 (fuel price inflation)
• Port charges: ~$50,000
• Risk premium / crew bonus: ~$500,000+
• Mine risk surcharge (new): ~$1,000,000+
• Total: ~$15,000,000-$20,000,000+ ($7.50-$10.00/barrel)

That $7-10/barrel increase in transportation cost is already embedded in Brent’s war-era pricing. But the real cost is not the per-barrel figure; it is the structural impossibility. Seven P&I clubs remain withdrawn. Without P&I coverage, no vessel receives blue cards. Without blue cards, no port accepts the vessel. Without port acceptance, no cargo discharges. The entire chain is severed at the insurance link, and no amount of military ceasefire or government reinsurance has reconnected it.

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. On March 28, this risk materialized: Houthis formally joined the war, launching ballistic missiles at Israel and threatening to close Bab el-Mandeb itself. A Houthi deputy information minister stated explicitly: “Closing the Bab al-Mandeb strait is among our options.” The Saudi East-West Pipeline’s 2.5 million barrels per day bypass now runs through a Houthi fire zone. War-risk premiums for Red Sea transits, already elevated from the 2024-2025 Houthi campaign, are climbing further as VLCCs loaded at Yanbu carry $200 million in crude at current prices. The P&I clubs have not withdrawn Red Sea coverage yet, but the Listed Area designation remains in effect and the dual-chokepoint risk is now operational, not theoretical. If Houthis escalate from missiles-at-Israel to missiles-at-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 genuine 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 coalition escort transits with zero incidents — and critically, confirmation that the mined waters have been swept. The ceasefire has not triggered any club to move. Until they do, the strait remains commercially closed regardless of diplomatic developments.

2. Mine clearance timeline: The insurance market’s new critical variable. Iran deployed thousands of mines; only 44 minelayers have been destroyed, and the US has only 3 LCS ships available for mine countermeasures, with MCM technology reliable only ~30% of the time. DIA assessment: Iran could keep the strait shut 1-6 months via mines alone. No P&I club will reinstate coverage for a mined waterway, ceasefire or not.

3. 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. The ceasefire has not yet prompted a revision.

4. US $40B reinsurance facility activation: The expanded facility with eight partners is the largest government backstop for maritime risk in history, but it remains a policy instrument, not a market one. It covers hull, machinery, and cargo — but P&I clubs still refuse to issue blue cards under government reinsurance. The facility insures the steel, not the voyage. Watch for the first actual policy written under this facility and whether any port authority accepts it as equivalent to commercial P&I coverage.

5. VLCC day rate trajectory: Rates exceeded $1 million per day before the ceasefire and are now declining on ceasefire hopes. A sustained drop below $500,000/day signals the market believes reopening is real. A rebound above $800,000/day signals the ceasefire is not holding. The rate trajectory is the market’s real-time truth serum.

6. Ceasefire durability: The two-week window is a negotiation runway, not a resolution. Kuwait intercepted 28 Iranian drones targeting oil infrastructure and power stations on the morning of April 8, hours after the ceasefire was announced. Lavan refinery and Sirri Island saw explosions of unknown origin post-ceasefire. If the ceasefire collapses, oil snaps back to $120+ and the insurance market hardens further — possibly permanently for this conflict cycle.

7. Crew willingness to sail: 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. With 22+ ships attacked and mines active, crew refusal creates a third enforcement mechanism beyond drones and insurance: labor. The ceasefire does not address mines or unexploded ordnance, and no captain will volunteer to be the test case.

Epilogue: The Ceasefire That Proved the Thesis

On April 7, approximately two hours before Trump’s “Power Plant Day” deadline, Pakistan brokered a two-week ceasefire. Iran agreed to reopen the Strait of Hormuz “via coordination with Iran’s Armed Forces and with due consideration of technical limitations.” Oil crashed: Brent fell 13.8% to ~$94, WTI fell 16.3% to ~$94.55, the worst single-day drop since April 2020. Equity futures surged. Headlines declared the crisis easing.

The insurance market did not move.

Seven P&I clubs remain withdrawn. No blue cards have been issued. Premiums remain at 5-10% of hull value. On the morning of April 8, only two ships attempted transit through the strait — Tour 2 (a US-sanctioned Iranian Suezmax) and NJ Earth (a Greek-owned bulk carrier with possible AIS anomalies). Eight hundred vessels remain trapped. Maersk, the world’s largest container line, issued a statement that the ceasefire “does not yet provide full maritime certainty.” CMA CGM and Hapag-Lloyd remain suspended on Hormuz and Red Sea transits.

This is the insurance weapon’s final proof of concept. A ceasefire is a political event. Insurance reinstatement is a risk event. The two operate on fundamentally different timelines and respond to fundamentally different inputs. Diplomats respond to rhetoric, domestic pressure, and face-saving formulas. Underwriters respond to loss data, mine clearance verification, and demonstrated safe transit. Iran’s “technical limitations” caveat — a reference to the thousands of mines still active in the strait — is precisely the language that keeps insurance committees from convening.

The military campaign may pause. The insurance blockade persists. That asymmetry — between the speed of political de-escalation and the glacial pace of commercial risk recalibration — is the core insight of this analysis. It was true in Suez in 1956, true in the Tanker War in 1988, and it is true today at a scale that dwarfs all precedent. The insurance weapon is the slowest to activate and the slowest to deactivate, and in the gap between ceasefire and commercial normalization, trillions of dollars of trade remain frozen.

The strait may be “open” in the political sense. In the commercial sense — the only sense that moves oil — it remains closed.

Sources

• Lloyd’s List: VLCC day rates ($1M+/day, Apr 7; $423,736 record, Mar 7), traffic data, vessel attack reporting
• P&I club circulars: 7 clubs withdrawn (Gard, Skuld, NorthStandard, London P&I, American Club, Steamship Mutual + 1 additional)
• Lloyd’s Joint War Committee: Listed Area designations, Persian Gulf
• IMO/UKMTO: vessel attack reports (22+ ships attacked through Day 40)
• Insurance Journal, S&P Global: war-risk premiums 5-10% of hull value (Apr 2-3)
• Kpler: vessel anchoring data (800+ ships trapped, Apr 8)
• Bloomberg, Al Arabiya: Saudi Red Sea export data (786K to 2.5M bbl/day)
• CENTCOM: strike counts (13,000+ targets by Day 39), 130+ ships destroyed, 44 minelayers destroyed
• US DFC: $40B reinsurance facility (expanded Apr 6; DFC + Chubb + AIG + Berkshire Hathaway + Travelers + Liberty Mutual + Starr + CNA)
• Maersk: ceasefire “does not yet provide full maritime certainty” (Apr 8)
• Bloomberg, CNN, Al Jazeera: Al-Salmi VLCC struck at Dubai anchorage (Mar 31); Aqua 1 struck in Qatar waters (Apr 1)
• Maritime Executive, MarineTraffic: MSC Ishyka claim debunked via AIS data (Apr 4)
• TankerBrief Crisis Situation Report v32 (2026-04-08): Day 40 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