Hormuz risk lifts oil shipping premiums

Oil shipping is getting more expensive not because the world ran out of crude, but because moving that crude through the Strait of Hormuz now looks a lot more dangerous. That danger has been repriced fast. By early May, insurers were still treating the Gulf as a live war zone, tanker traffic was still badly reduced, and shipowners were still deciding whether a voyage was worth the risk at all. The result is simple — even when oil still flows, it costs more to move. ### Why is Hormuz the chokepoint? The Strait of Hormuz is the narrow outlet for the Persian Gulf. In normal times, roughly 20% of global oil supply moves through it, plus big volumes of LNG and other cargo. So when the route gets threatened, the problem is not just “Middle East shipping.” It becomes a global energy logistics problem almost immediately. ### What changed this spring? The trigger was the 2026 Iran war and the follow-on threats to commercial navigation. After the late-February escalation, insurers widened risk assumptions, ships faced attacks and interference, and by early April even a ceasefire did not restore normal confidence. On May 1, Lloyd’s List was still describing the crisis as an active distortion across shipping markets, not a resolved shock. ### What happened to insurance? War-risk cover did not disappear completely, but it got repriced hard and in some cases tightened or temporarily pulled back. In this market, a shipowner often has to buy extra voyage-specific cover for just a few days, and the price can change daily with the security picture. That matters because the costs of a tanker. ### How big was the jump? Before the crisis, a Gulf transit might carry a war-risk premium around 0.02% to 0.05% of vessel value. By mid-March, reported quotes had moved to roughly 0.5% to 1%, with some voyages effectively becoming uneconomic. For a $120 million tanker, that turns a roughly $40,000 premium into something like $600,000 to $1.2 million for one trip. That is not a rounding error — it is a new tax on moving oil. ### Are ships still going through? Yes, but at much lower volumes. USNI said on May 1 that commercial transits had fallen to their lowest level since the opening days of the offensive. Other reporting in April showed some ships still crossing despite the blockade conditions, but the overall pattern was constrained traffic, waiting time, rerouting, and a market that no longer behaves like normal peacetime shipping. ### Why does that raise oil costs even without a full closure? Because oil has to be delivered, not just produced. If fewer ships are willing to load, insurers demand more money, and voyages take longer or need alternate routing, the freight bill rises before any refinery even buys the barrel. Basically, the bottleneck adds friction everywhere — charter rates, insurance, scheduling, and available tanker capacity. ### Why haven’t prices normalized yet? The catch is that shipping markets care less about diplomatic headlines than about whether crews and hulls can get through safely. Argus’s insurance Q&A in mid-April made the point clearly — a ceasefire has to look stable and verifiable before insurers really relax. Until that happens, owners, brokers, and underwriters keep pricing the route as if the next disruption could start tomorrow. ### Bottom line? Hormuz has not needed a total shutdown to become more expensive. The insurance market already did part of the blocking by making each transit costlier, harder to arrange, and riskier to justify. That is why a regional security crisis can show up globally as higher freight costs first — and then as higher energy prices after.