When underwriters cannot name the peril with confidence, they still have to price it. In the Strait of Hormuz in March 2026, three commercial vessels were damaged by what reporting consistently called “unknown projectiles” while the waterway remained open in theory and closed in practice. The gap between ambiguous attribution and hard hull exposure is where premiums balloon and shippers pay whether or not anyone ever admits who fired.
Ambiguous attribution forces worst-case pricing
On 11 March 2026, BBC live coverage and regional reporting described three ships struck near the strait: a Thailand-flagged bulk carrier with a fire later extinguished, and two others including a Japan-flagged vessel and a Marshall Islands-flagged ship with hull damage, crews reported safe. The UK Maritime Trade Operations and parallel channels logged “unknown projectile” language. That phrasing matters. War risk clauses live or die on definitions of hostile act, state actor, and excluded zones. When the trigger event is deliberately opaque, London and mutual underwriters default to the broadest interpretation and the highest rate.
Reuters reported in early March 2026 that major marine insurers including Gard, Skuld, NorthStandard, the London P&I Club, and the American Club cancelled or suspended war risk cover for defined Gulf and adjacent waters effective from 5 March, with Japan’s MS&AD also pulling back. GIC Re issued notice cancelling hull war risk in a swathe of zones including the Persian/Arabian Gulf and Gulf of Oman. The sequence is not random: once projectiles land without a clean narrative, the market treats the whole basin as a single escalatory pool.
From fractions of a percent to multiples of hull value
Yahoo Finance and Reuters analysis pieces in March 2026 quoted war risk underwriters moving additional premium boundaries daily. Hull war risk that sat around 0.25% of value before the flare-up was repriced in examples to 1% and in stressed cases to 3%. On a $250 million tanker that is the difference between roughly $625,000 and $7.5 million for a single transit. Cargo war risk is being reviewed voyage by voyage, especially on energy trades. Maersk, MSC, and CMA CGM routes shifted or added emergency surcharges in the thousands per container according to trade press. None of that requires a declared blockade; it only requires a believable chance of another hit.
Lloyd’s Market Association told Insurance Journal and Reuters on 5 March 2026 that the London market was engaging with Washington on a public-private framework and that the vast majority of Gulf hulls remained insured there, but capacity was tightening. The U.S. Development Finance Corporation floated a political-risk backstop on the order of $20 billion. Brokers including Marsh were in the room. The point for owners is simpler: until terms are executable at scale, the uncertainty tax is cash upfront.
What This Actually Means
The strait still moves roughly a fifth of global oil and LNG on paper. In March 2026, traffic counts and satellite trackers cited by AP and Reuters showed collapses on the order of ninety percent versus normal flows, with hundreds of ships at anchor. That is not because every lane is mined; it is because no CFO signs a voyage where the policy might void mid-passage. BBC’s framing of the Hormuz as a chokepoint is correct structurally; the immediate brake is financial. Unknown projectiles are a forcing function: they deny underwriters the clean fact pattern that keeps clauses narrow. Until attribution stabilises or governments backstop claims in ways the market believes, premiums will outrun clarity.
Background
What is the Strait of Hormuz? It is the only sea passage from the Persian Gulf to the Gulf of Oman and open ocean. Wikipedia and standard references describe it as one of the world’s most strategic chokepoints. That geography makes any projectile event systemic rather than anecdotal.
Sources
BBC The National Reuters Yahoo Finance Insurance Journal AP News