London Insurers Expand Red Sea High-Risk Zone After Houthi Attacks On Saudi-Linked Ships

London’s marine insurance market has widened the Red Sea area it classifies as “high risk” after attacks on Saudi-linked vessels by Yemen’s Iran-aligned Houthis, a move that is expected to increase insurance costs for ships operating in one of the world’s busiest trade and energy routes.

The decision follows the Houthis’ July 20 announcement of a maritime embargo against Saudi Arabia, which the group said opened a new front against the United States and its allies in the war involving Iran.

The Joint War Committee (JWC), whose guidance is widely used by marine insurers when setting war risk premiums, said it had moved the Red Sea notification line further north after two Saudi-linked vessels were attacked in the days following the Houthi announcement.

“The decision … to amend those listed areas reflects the recent escalation by the Houthis and their attacks on Saudi vessels in the Red Sea,” Neil Roberts, head of marine and aviation at the Lloyd’s Market Association (LMA) and secretary of the JWC, said in a statement on Thursday.

The JWC includes syndicate members from the LMA and representatives from the London insurance market. Its list of high-risk areas is closely followed by underwriters when deciding war risk insurance premiums.

The latest changes have already increased insurance costs.

Insurance industry sources said indicative war risk premiums for Saudi ports north of Jizan, including Jeddah and the key oil export terminal of Yanbu, have risen to about 1% of a ship’s value, up from 0.25% earlier this week.

Premiums for voyages through the southern Red Sea have also increased to between 1% and 2% of a ship’s value, compared with around 0.3% before the Houthis announced the embargo. Even a small increase in war risk premiums can add hundreds of thousands of dollars to the cost of a seven-day voyage.

Insurance costs had already started rising immediately after the Houthis announced the embargo on July 20.

At that time, indicative war risk premiums increased to around 0.75% of a ship’s value from about 0.3% before the announcement, according to insurance industry sources.

The increase came after the Houthis announced a naval blockade on Saudi Arabia, raising concerns about merchant shipping. It remains unclear how the Houthis would enforce such a blockade or whether it would include a return to attacks on commercial shipping.

British maritime security company Ambrey said Saudi Arabia-flagged, owned or operated vessels, ships travelling to or from Saudi Arabia, and vessels calling at Saudi Red Sea ports face a high risk of Houthi attack.

“The Houthis made mistakes during the (2024) Red Sea crisis in targeting shipping with out-of-date affiliations to companies. It is likely that vessels could be targeted for mistaken identities,” Ambrey said.

Saudi state oil company Saudi Aramco, the world’s largest oil exporter, has increased the use of its Yanbu terminal on the Red Sea since the U.S.-Israeli conflict with Iran began on Feb. 28.

The Bab el-Mandeb Strait, which connects the Red Sea with the Gulf of Aden, remains a key route for global trade and oil shipments. According to the reference data, a full closure of the waterway would halt Saudi oil exports to Asia and could reduce global oil supply by 7%.

Shipping traffic in the Red Sea has not fully recovered since the Houthis began attacking vessels off Yemen in November 2023, saying they were acting in solidarity with Palestinians in the Gaza war. Some attacks continued until mid-2025 before ending completely after the Gaza ceasefire in October last year.

References: Reuters, Times of Israel