US Strikes Test Iran Ceasefire as Marine Insurance Premiums Hold at Extremes

The fragility of the US-Iran ceasefire was fully exposed on Memorial Day as American forces executed fresh strikes in southern Iran. While President Donald Trump honored the 13 service members killed during Operation Epic Fury at Arlington National Cemetery, regional diplomats were haltingly trying to piece together a framework for peace.

According to US Central Command spokesman Captain Timothy Hawkins, the operation targeted missile launch sites and Iranian boats attempting to lay mines near Bandar Abbas. Hawkins described the action as a “self-defense” measure taken with “restraint.”

For marine underwriters, categorizing military strikes as “restraint” is fundamentally incompatible with pricing risk during a ceasefire. The core actuarial problem stems from the opening hours of the conflict on February 28. When coordinated US and Israeli strikes hit Iran’s nuclear infrastructure and assassinated Supreme Leader Ali Khamenei, the Strait of Hormuz effectively closed before a single Iranian mine hit the water.

The immediate market response was brutal, though widely misunderstood. While rumors circulated that insurers had entirely abandoned the region, the Lloyd’s Market Association (LMA) clarified that coverage remained available—it was simply priced at wartime extremes.

Market Metric	Pre-War Baseline	Early March Peak
Transit Premium	Hundreds of thousands (USD)	1.5% to 3% of hull value
US/UK/Israeli Vessels	Standard pricing	Up to 5% of hull value
VLCC ($138M Value)	Standard pricing	$10M – $14M per voyage

As Calvin Gray, global head of marine at Intact Insurance, noted, the strait may be officially open, but normality is nowhere in sight. Shipping companies are pausing transits due to legitimate crew and vessel safety concerns—fears entirely validated by Monday’s strikes on mine-laying boats—not an absence of insurance capacity.

Adding to the complexity is Tehran’s rollout of “Hormuz Safe.” Operating under Iran’s newly declared Persian Gulf Strait Authority, the state-backed digital platform offers maritime insurance for vessels transiting the strait, with premiums settled in cryptocurrency. For Western brokers and underwriters, the scheme is an absolute non-starter, carrying massive sanctions compliance and enforcement risks. Meanwhile, a competing US government backstop for war-risk coverage has reportedly attracted zero takers because its structural requirements simply do not align with commercial shipping realities.

Despite the kinetic action on the water, the diplomatic backchannel is showing slight movement regarding the central obstacle of the conflict: nuclear capability.

Negotiating Party	Previous Stance	Current Position
United States	Physical transfer of all enriched uranium to US custody	Open to destruction in place under Atomic Energy Commission oversight
Iran	No plans for a second round of negotiations (April)	Focused on the negotiation process with measured diplomatic tone

Trump signaled a meaningful shift on Truth Social regarding Iran’s enriched uranium. Abandoning his earlier demand that all nuclear material be physically transferred to American custody, he suggested the uranium could be destroyed in place under the observation of the Atomic Energy Commission. Iranian foreign ministry spokesperson Esmaeil Baghaei responded with a measured tone, walking back earlier threats to abandon the talks entirely.

The broader region, however, remains highly volatile. Israeli Prime Minister Benjamin Netanyahu recently ordered the IDF to “intensify the blows” against Hezbollah, striking over 70 infrastructure sites in Lebanon and expanding the conflict’s geographic footprint well beyond the direct US-Iran theater.

For the marine insurance market, the definition of a formal ceasefire no longer matters. Since early April, US and Iranian forces have exchanged fire multiple times under the guise of a nominal truce. The conflict proved that the Strait of Hormuz can actually be closed—a scenario that was previously treated as a theoretical extreme. Moving forward, the global shipping industry will be forced to operate with that knowledge permanently baked into every actuarial model and transit premium, regardless of when the guns finally fall silent.