How Actuaries Closed the Strait of Hormuz

What the Hormuz crisis reveals about insurance, geopolitics, and private capital in a multipolar world.

On 28 February 2026, the United States and Israel launched strikes on Iran. Within 24 hours, seven of the world’s largest maritime insurers had cancelled war risk coverage for the Persian Gulf. Within 72 hours, commercial shipping through the Strait of Hormuz, which carries 20% of global oil supply, had collapsed by 95%. Not a single commercial vessel had been attacked. The insurance market had closed the strait before Iran’s navy could.

How Maritime Insurance Works

Maritime insurance is one of the oldest financial instruments in the world - Lloyd’s of London traces its origins to a 17th-century coffee shop where merchants gathered to spread the risk of losing ships at sea. The underlying logic has not changed: shipping is inherently dangerous, individual losses can be catastrophic, and risk pooled across many voyages becomes manageable. What has changed is the sophistication of the architecture sitting beneath that principle.

A modern commercial vessel operates under two distinct layers of insurance. The first is standard marine cover — hull and machinery insurance for the ship itself, and cargo insurance for the goods it carries. These policies cover “perils of the sea”: storms, collisions, groundings, mechanical failure. In peacetime, hull premiums typically run between 0.2% and 0.5% of vessel value annually — on a $100 million tanker, roughly $200,000–$500,000 per year, a manageable operating cost absorbed within normal freight economics.

The second layer is war risk insurance, and it operates on entirely different terms. Every standard marine policy contains a war exclusion clause — a provision that explicitly removes coverage for losses arising from hostile acts, weapons of war, and related perils. War risk must be purchased separately, and in peacetime its additional cost is modest: typically 0.1%–0.3% of hull value per voyage through elevated zones, or another $100,000–$300,000 on that same $100 million vessel.

The moment geopolitical conditions deteriorate, however, these premiums can reprice by an order of magnitude within 48 hours. Critically, war risk policies carry a cancellation clause unique to the product: underwriters in the London market can withdraw coverage with just seven days’ notice, and US-worded policies with as little as 48 hours — a feature that in normal times allows rapid repricing, but in a genuine crisis becomes the mechanism by which entire trade routes can be severed almost instantaneously.

The third component is the P&I club — Protection and Indemnity mutuals that cover third-party liabilities: crew injury, pollution cleanup, collision damage. These are the truly catastrophic tail risks of maritime commerce. A laden supertanker hitting a mine in a congested waterway creates pollution liability running into the billions, which is why P&I clubs reinsure their exposures through a London-based pool called the International Group, placing the ultimate tail risk back into the broader reinsurance market.

The architecture governing all of this — who pays, who prices, and crucially, who decides where is safe to sail — sits with a single institution: the Joint War Committee. The JWC, comprising underwriters from Lloyd’s and the International Underwriting Association, maintains the Listed Areas register: a live map of zones deemed to carry elevated war, terrorism, or piracy risk. Its significance extends well beyond insurance pricing. When the JWC lists a region, war risk premiums spike immediately, P&I reinsurers invoke cancellation clauses, and the economic calculus of transiting that waterway shifts dramatically — often to the point where commercial shipping halts entirely regardless of whether a single shot has been fired.

This makes the JWC one of the most consequential and least-discussed chokepoints in global trade. The Strait of Hormuz carries roughly 20% of global oil supply. The moment Lloyd’s underwriters mark it as a listed high-risk area, the cost of moving energy through it can multiply fivefold overnight — effectively imposing an economic blockade through insurance architecture rather than military force. For context, China sources approximately 40% of its crude oil imports through Hormuz. The US, through its influence over the London insurance market, holds a lever over that supply chain that requires no warships to pull.

What Happens When War Breaks Out

The war risk insurance system described above is engineered for normal volatility — piracy hotspots, localised territorial disputes, the occasional missile exchange. It is not engineered for a sudden, large-scale conflict involving a state actor with the ability to threaten one of the world’s most critical waterways. When that scenario materialises, the system does not bend gracefully. It breaks from the top down, and it breaks in hours.

The cascade begins not with Lloyd's syndicates or P&I clubs, but with their reinsurers — the wholesale capital providers sitting one layer behind the visible market. When conflict erupts near a critical chokepoint, reinsurers face a problem that standard risk modelling is not built for: hundreds of vessels suddenly concentrated in a single danger zone, creating the potential for simultaneous claims on a scale that exceeds their Solvency II capital buffers. This is not a pricing decision — it is a solvency one. Reinsurers pull capacity, and once they do, the clubs have no choice but to follow. The cancellation notices that reach shipowners are not discretionary judgements made by P&I clubs weighing the risk — they are contractual consequences of a decision made one layer up, often within hours of the first shots being fired.

What this cascade exposes is a structural vulnerability built into the system's design: the very clauses intended to allow orderly repricing become, under genuine crisis conditions, a mechanism for near-instantaneous market shutdown — a hair trigger, not a safety valve. A conflict beginning on a weekend can produce insurance cancellations within 24 hours and a commercial shutdown within the week — before most governments have even convened an emergency session. What takes a hostile state days to assert militarily, the insurance market can enforce financially in hours.

The Gulf in 2026: How Insurance Stopped Ships Before Iran Did

The consequences of that hair trigger, in February 2026, were immediate and measurable. Hostilities began on February 28. By March 1 , within 24 hours, seven of the twelve International Group P&I clubs had issued identical cancellation notices: Gard, NorthStandard, Skuld, Steamship Mutual, the American Club, the Swedish Club, and the London P&I Club - collectively insuring approximately 90% of the world’s ocean-going tonnage. Their notices gave shipowners exactly 72 hours before war risk coverage terminated automatically across the Persian Gulf, the Gulf of Oman, Iranian waters, and all adjacent seas. Hull war risk premiums, which had sat at 0.15%-0.25% of vessel value before hostilities, were quoted at 5%–10% within 48 hours. On a $250 million VLCC, that translated to a single-voyage insurance bill of $12–25 million - in many cases exceeding the freight revenue the voyage would generate.

The entire commercial insurance architecture for one of the world’s most critical shipping lanes had been dismantled in a single business day.

And yet, on the evening of February 28, outgoing traffic through the strait was still heavy. By March 1 and 2, it was empty - not because Iran had attacked commercial vessels, and not because the IRGC had formally closed the waterway. The formal closure declaration came on March 2; the explicit threat to fire on passing ships came on March 4. Commercial shipping stopped because, within 24 hours of the first airstrike, the economics of transit had ceased to make sense.

Maersk suspended all Hormuz crossings on March 1. CMA CGM instructed all vessels in the Gulf to proceed immediately to shelter. MSC ordered its entire regional fleet to designated safe areas. Hapag-Lloyd suspended Arabian Gulf calls and began rerouting around the Cape of Good Hope - simultaneously imposing a War Risk Surcharge of $3,500 per container, effective March 2, three days before the insurance cancellations even took legal effect.

These decisions preceded any IRGC drone strike on a commercial hull. They were pure economic logic: when a single-voyage insurance bill exceeds freight revenue, the voyage does not happen.

There is a further dimension that made the situation worse than the premium numbers alone suggest - the aggregation trap.

With major shipping lines simultaneously suspending transits, vessels that had already entered the Gulf had nowhere to go. Over 150 non-sanctioned commercial vessels were anchored or drifting within days; by April that number exceeded 2,000, with approximately 22,500 mariners aboard. This concentration of tonnage created its own insurance crisis: reinsurers modelling a single IRGC strike on a cluster of anchored vessels were now looking at potential simultaneous claims across dozens of hulls. The stranded fleet had itself become an uninsurable risk. Hapag-Lloyd disclosed that the crisis was costing it $60 million per week - for just four vessels trapped inside the Gulf. Across 1,550 stranded ships the aggregate economic damage ran into billions weekly.

The mine problem added a dimension that will shape insurance markets long after any ceasefire. Iran deployed sea mines throughout the strait, and US military officials told Congress in April that clearing them to a certifiable standard could take up to six months - and only after active hostilities end. Mines are the ideal asymmetric weapon against insurance markets precisely because they create irreducible uncertainty. A drone attack is a known, priceable event. A minefield of unknown density and location is not, it is an open-ended liability that no actuarial model can responsibly bound. The strait can be militarily quiet and commercially paralysed simultaneously.

What the 2026 crisis demonstrated with unusual clarity is that the Strait of Hormuz has two closure mechanisms - one military, one financial - and the financial one is faster, broader in effect, and harder to reopen. Iran’s navy can be degraded. Insurance market confidence cannot be bombed back into existence. The IRGC needed days to formally assert control of the strait. The insurance market needed 24 hours to make that assertion economically redundant.

The Future of Maritime Insurance: Why the Worst Crisis in Decades May Be the Industry’s Defining Opportunity

The instinct, when a conflict ends, is to assume the world snaps back. Shipping resumes, premiums normalise, the market forgets. The evidence from every major maritime disruption of the past decade suggests the opposite, and the Hormuz crisis of 2026 will prove no exception. Understanding why requires following the insurance market’s logic forward rather than backward.

Consider the question directly: if the US and Iran signed a deal tomorrow, what would actually happen? A ceasefire is a political event. Insurance normalisation is an actuarial one, and the two operate on entirely different clocks.

The immediate aftermath of any deal would see the JWC begin a formal reassessment of the Persian Gulf’s Listed Area designation. That process is not automatic - it requires demonstrated evidence of sustained safe transit, not merely a signed agreement. Underwriters would offer cover again, but at breach premiums that reflect residual uncertainty: industry analysts estimate the initial post-ceasefire rates would settle in the 3%–8% range, down from crisis peaks but still ten to thirty times the pre-war baseline of 0.25%. The first ships back through the strait would transit under enhanced premium structures that only compress as transits multiply and no claims materialise.

The mine problem alone could delay that accumulation by months. US military officials testified to Congress in April 2026 that clearing the strait to a certifiable standard would take up to six months after hostilities end, and insurers have been explicit that verified mine clearance, not a ceasefire declaration, is the operative threshold. The strait can be politically open and actuarially closed simultaneously, for as long as the mine risk remains unquantifiable.

The Red Sea offers the most instructive precedent. When Houthi attacks effectively ceased in October 2025, Maersk waited two full months before sending its first vessel back through the waterway - and even then, premiums had only fallen to around 0.2%, barely touching the pre-crisis baseline of 0.05%. Normal traffic volumes had still not recovered by the time the Iran war began in February 2026, over a year after the ceasefire. The path back to normalcy is measured in quarters, not weeks and some level of elevated risk pricing may prove permanent.

The world the insurance market is now pricing into is not the world of 2019, when Hormuz was a theoretical risk and the Red Sea was a routine transit. It is a world in which both chokepoints have been demonstrated to be closeable - not in wargames but in practice, with commercial consequences that rippled through every supply chain on earth. That demonstration cannot be undone. Every actuarial model written after 2026 will incorporate a non-zero probability of Hormuz closure that simply did not exist in prior risk frameworks. The baseline has shifted permanently upward.

This is the availability bias dynamic made structural. After a terrorist attack in a major city, hotel prices fall sharply - not because the city has become objectively more dangerous in any durable sense, but because perceived risk overshoots actual risk. Sophisticated investors who can correctly price the actual probability of recurrence, which in the case of Hormuz is meaningfully higher than pre-2026 but far lower than current crisis pricing implies, capture the spread between perception and reality. In the insurance market, that spread manifests as elevated premiums against a risk environment that, once stabilised, does not justify them.

What this creates, for insurers with the analytical capability to price it correctly, is a spread opportunity of unusual quality. On one side: a market still pricing Hormuz at near-crisis levels, driven by recency bias and institutional caution that will take quarters to unwind. On the other: an underlying risk environment that, once mines are cleared and transit track records accumulate, will be elevated relative to 2019 but nowhere near current pricing.

The insurer who can hold capital through the noise, deploying at post-crisis rates, collecting outsized premiums against a risk that is normalising faster than the market believes, captures that spread in full. Every uneventful transit compresses perceived risk further, every quarter without a major claim accelerates premium normalisation, and the underwriter who moved earliest captures the fattest part of the curve. The crisis created the dislocation. The opportunity is in pricing the recovery before the market does.

The Role of Private Capital: War as a Market-Making Event

The conventional framing of private equity’s relationship to insurance is transactional — PE buys insurers, takes them private, extracts cost efficiencies, relists them. That framing misses what makes the current moment genuinely unusual. The Hormuz crisis did not merely reprice an existing market. It exposed the structural limits of that market, triggered direct government intervention to replace it, and in doing so revealed both the fragility and the indispensability of private capital in the global risk transfer system.

The sequence of events in March 2026 is instructive. Within 24 hours of the escalation, London’s private market, which writes between 70% and 80% of the world’s war risk business, effectively withdrew from the Gulf. On March 3, Donald Trump posted on Truth Social that he had ordered the US Development Finance Corporation to provide, effective immediately, political risk insurance and guarantees “at a very reasonable price” for “ALL Maritime Trade, especially Energy, travelling through the Gulf.” By March 11, the DFC had announced Chubb as lead underwriter for a $40 billion revolving reinsurance facility. The consortium included Travelers, Liberty Mutual, Berkshire, AIG, and CNA.

The explicit framing from Washington was a challenge to London’s centuries-old dominance. Lloyd’s of London, which has written the world’s war risk since 1689, had been handed a direct competitor backed by the US government and the US Navy. Trump’s promise of cover “at a very reasonable price” was as much a geopolitical statement as an insurance one - a signal that the US intended to use the architecture of risk transfer as an instrument of strategic policy, just as it has used sanctions, dollar clearing, and technology export controls.

The outcome was revealing. The DFC facility attracted almost no uptake. The London market, contrary to the media narrative, had never actually ceased to function. The LMA’s own survey found 88% of Lloyd’s participants retained appetite to underwrite hull war risks throughout the crisis. What the market had done was price the risk honestly, at levels that made most voyages commercially unviable, but not at levels that represented market failure. The crisis was not a breakdown of the private insurance system. It was the private insurance system working exactly as designed. The government stepped in not because the market had failed, but because the market’s honest pricing produced geopolitical consequences that Washington found unacceptable.

The hard market created by the crisis is precisely the environment in which new private capital earns its highest returns. In insurance, hard markets are to sophisticated investors what recessions are to distressed debt funds. That is, the moment when pricing reflects genuine risk rather than competitive pressure is when incumbents are pulling back, and when those with capital and conviction can deploy at rates that would be unavailable in normal conditions. The Bermuda reinsurance market has historically been the vehicle through which institutional capital enters these windows. Sidecars, quota share arrangements, and Lloyd's syndicate capacity auctions all provide structured access to hard market premiums without requiring the operational infrastructure of a full insurer.

This observation is not Hormuz-specific. It connects to a broader thesis that NEEM has developed across its body of work. The post-Cold War era of relatively frictionless maritime trade, in which the US Navy’s uncontested dominance effectively subsidised the insurance industry’s peacetime pricing, is over.

Its replacement is a multipolar world in which state actors routinely use maritime coercion as a tool of geopolitical pressure. The evidence accumulated in 2026 alone is striking: Venezuelan waters became a contested zone following US intervention; US forces boarded a Russian-flagged vessel in an action that would have been unthinkable a decade ago; Iran demonstrated that a mid-tier power with drones and sea mines can shut the world’s most important oil corridor for months. These are not isolated incidents. They are data points in a trend that insurers, reinsurers, and their capital providers are only beginning to price fully.

The implication is straightforward: the baseline cost of maritime risk transfer has been permanently reset upward, across every major route, not just Hormuz. Premiums that were suppressed for thirty years by the implicit guarantee of Pax Americana will need to reflect a world where naval blockades, ship seizures, and chokepoint coercion are recurring features of the geopolitical landscape rather than tail-risk scenarios.

A shipping industry that got accustomed to war risk premiums measured in basis points is entering an era where they will be measured in percentage points, and the underwriters positioned to serve that market at scale will find themselves in a structurally more profitable business than the one they were running in 2019.

The Trump DFC intervention, regardless of its limited practical effect, introduced something new and durable: the explicit precedent of government as insurer of last resort for strategically critical shipping lanes. If governments stand ready to backstop the tail risk, the risk-adjusted return profile of the layers beneath that backstop improves materially. Private capital captures the hard market premiums; the sovereign absorbs the existential tail.

The deeper shift, which will play out over years rather than months, is in the architecture of the market itself. War risk insurance for the world’s major chokepoints - Hormuz, Bab el-Mandeb, the Taiwan Strait, the South China Sea - is transitioning from a niche specialty line priced against rare theoretical scenarios to a core geopolitical risk product priced against demonstrated, recurring realities. The market for that product will be larger, more institutionalised, and more capital-intensive than the one that existed before February 2026.

The question for private equity is not whether to be present in it but rather through which vehicle, at which layer of the capital stack, and at which point in the repricing cycle.

The Market the Crisis Built

Maritime insurance spent three decades as one of the most stable and unremarkable corners of global finance. Premiums were low, claims were rare, and the system hummed quietly in the background of a world trade order underwritten by American naval supremacy. The events of February 2026 ended that era with unusual finality.

What this note has traced is not simply a crisis. It is a structural transition - from a market priced for a world that no longer exists to one that must price for the world that does. The mechanics of that transition are now visible: the 72-hour clauses that can shut a global energy corridor overnight, the reinsurance cascades that move faster than navies, the government interventions that confirm rather than replace the indispensability of private capital, and the mine-strewn waters that will keep actuaries cautious long after diplomats declare peace. Each of these is a feature of the new normal, not an aberration from the old one.

The opportunity this creates for private capital is genuine, specific, and time-sensitive. Hard markets in specialty insurance are among the most reliably profitable windows in all of finance. This premium environment that private underwriters can access today reflects fear and uncertainty that will compress as stability accumulates, but the structural repricing underneath it will not reverse.

An investor who correctly distinguishes between the cyclical noise and the structural signal is positioned to capture both. The cyclical noise is the crisis premium - elevated rates driven by fear and recency bias that will mean-revert as stability accumulates. The structural signal is the permanent upward reset of baseline war risk pricing across every major chokepoint, which will not reverse regardless of how quickly Hormuz normalises.

The world is not going back to the 2010s. Naval blockades, ship seizures, and chokepoint coercion have graduated from theoretical risks to standard instruments of statecraft. Every voyage through Hormuz, Bab el-Mandeb, or the Taiwan Strait now carries a risk premium that would have seemed extraordinary five years ago and will seem routine five years from now.

The companies underwriting that premium, and the investors backing them, are not merely participating in a recovering market. They are building positions in the infrastructure of a new geopolitical order, one in which the pricing of risk is itself a form of power.

The crisis did not destroy the maritime insurance market. It created a far more valuable one.

Disclaimer: This Market Note is produced by NEEM Group for informational purposes only and does not constitute investment advice or a solicitation to buy or sell any security. The views expressed reflect NEEM’s analysis at the time of writing and are subject to change. Readers should conduct their own due diligence before making any investment decisions.