Bibliography

• https://www.weforum.org/stories/2026/04/how-middle-east-war-turning-governments-into-insurers-last-resort

Source Attribution

This article synthesizes factual reporting from public sources including institutional reports, news agencies, and industry briefings. Claims are drawn from the cited sources listed in this article.

Overview

The Lloyd's Market Association (LMA) — the collective body representing the Lloyd's of London insurance market — played a central role in the Hormuz crisis through the rapid, near-total repricing of maritime war risk insurance. The LMA's Joint War Committee (JWC) acts as the industry's body for designating high-risk maritime zones, with its designations triggering mandatory additional premiums (MAR clauses) across the market. Within 48 hours of the US–Israel strikes on Iran on February 28, 2026, the JWC executed one of the fastest conflict zone expansions in its history.

The Insurance Shock

Immediate Aftermath of Strikes

Within 48 hours of the coordinated US–Israel airstrikes on Iran:

• War risk premiums surged fivefold across the market
• Major marine insurers canceled existing coverage en masse and offered replacement policies at approximately sixty times pre-crisis rates
• The Lloyd's Market Association's Joint War Committee (JWC) redesignated the entire Arabian Gulf — including the Strait of Hormuz — as a conflict zone, expanding its "high-risk" designation beyond previous hotspots

This triggered MAR (Marine, Aviation and Transport) clause impositions, which mandatorily attach additional war risk premiums to all voyages through the Persian Gulf.

Premium Levels

By mid-April 2026:

• Additional war risk premium for tankers and bulk carriers: approximately 1% of vessel value (per Argus reporting, April 13)
• No-claim bonuses of 35–50% applied to vessels remaining in the Mideast Gulf — meaning only those already present could earn any reduction
• For a $100 million vessel, a 1% war risk premium equates to $1 million per transit — making Hormuz passage economically prohibitive for all but the highest-value crude parcels

Technical Availability vs. Practical Unavailability

A critical nuance clarified by the LMA itself:

"War insurance technically remains available for Hormuz transits — it is simply that premiums remain so elevated, and the conditions so uncertain, that most shipowners and their crews are not willing to proceed."

An LMA survey found:

• 88% of Lloyd's marine war market participants retained appetite to write hull war risks
• Over 90% continued to offer cargo cover

This means the insurance market did not collapse — it repriced. The distinction matters: the LMA was not declaring the market closed, but rather the economics of transit had been rendered prohibitive by the market itself.

Traffic Impact

Pre-war average: 178 ships per day transiting the Strait of Hormuz.

Post-crisis traffic: reduced by approximately 95% — matching or exceeding the decline seen during the 2019 Tanker War escalations. The majority of remaining transits were Iranian-linked vessels or those already loaded before the crisis began.

The US Government Backstop

In response to the insurance seizure, the Trump administration directed the US International Development Finance Corporation (DFC) to provide political risk insurance to support continued shipping through Hormuz:

• DFC announced a $40 billion reinsurance facility in partnership with Chubb and other leading US insurers
• Coverage spanned hull, cargo, and liability risks, including physical damage to vessels, goods, and third-party liabilities
• Initial uptake: zero takers — commercial shipowners found the terms, deductible structures, or associated costs still insufficient to justify transit
• The gap between the DFC facility and market requirements highlighted the limits of sovereign backstops without full de facto reinsurance

The Mechanism of Economic Closure

The Lloyd's insurance repricing was the key mechanism by which physical disruption became economic closure. Even where vessels and crews were willing to navigate the Strait, the insurance cost effectively added $1 million or more per transit — far beyond the margin on a typical crude cargo at $60–80/bbl. The result: Hormuz was economically closed even where AIS data showed occasional transits.

Significance for the Oil Shock KB

The Lloyd's insurance response demonstrates that the market itself responded faster than the blockade: within 48 hours, commercial insurance pricing had done what naval threats alone had not. This is a case study in how private market risk pricing can amplify and accelerate geopolitical disruptions — turning a partial blockade into a near-total commercial closure.

The LMA's distinction between "technically available but economically prohibitive" insurance is critical for interpreting why Hormuz transits fell ~95% even though no single navy physically stopped every vessel.

Sources: World Economic Forum (April 9, 2026), Insurance Business Mag, Albanyantree/Argus, Small Wars Journal (May 13, 2026).