The United States has sanctioned two Iranian firms tied to a Strait of Hormuz insurance scheme and eight tankers linked to Iran’s shadow fleet, turning Tehran’s shipping-control system into a fresh sanctions target.
The U.S. Treasury Department said Wednesday that its Office of Foreign Assets Control designated Persian Gulf Marine Insurance Company and HormuzSafe Marine Services Authority, accusing them of helping an Islamic Revolutionary Guard Corps-backed effort to force commercial vessels to buy mandatory maritime insurance before transiting the Strait of Hormuz.
That is the new angle. List25 covered HormuzSafe in May as Iran’s reported Bitcoin-settled shipping-insurance play. Wednesday’s move is the enforcement follow-up: Washington is now treating that system as an extortion network and blocking the companies, vessels, and related property under U.S. sanctions rules.
What Treasury says Iran was doing
Treasury said the two firms were part of a scheme to extract revenue from ships moving through one of the world’s most important energy chokepoints. The department said the policies claimed to cover risks such as vessel seizures, while arguing that many of those risks were created by Iran itself.
The release said HormuzSafe advertised maritime insurance, traffic control, security, and emergency-response services for ships in the strait, and accepted Bitcoin and other digital assets as part of an effort to bypass sanctions. Treasury also tied the broader system to the IRGC-backed Persian Gulf Strait Authority, which Washington sanctioned in May.
Treasury Secretary Scott Bessent said the United States would not allow Iran to hold global commerce hostage or use international shipping to finance the IRGC. The department said Iran was trying to monetize the Strait of Hormuz while its economy remains under heavy pressure.
Eight tankers were also blocked
Reuters, published by BOE Report, reported that the new sanctions targeted 10 entities and eight more tankers. Six of the entities were based in China, according to the Treasury Department.
The blocked vessels named by Treasury were Well Sail, Natsumi, Crystal, Nireta, Yehope, Lily, Al Salmi, and Breeze V. Treasury said the vessels had transported Iranian crude oil or petroleum products, including shipments to China and the United Arab Emirates.
Since the beginning of 2026, OFAC has sanctioned more than 100 vessels linked to Iran’s shadow fleet. That matters because the tankers are not just a side issue. Oil revenue remains one of Tehran’s core financial lifelines during the crisis, and Washington is trying to squeeze both the ships carrying Iranian crude and the services Iran uses to control maritime traffic.
Why this is different from earlier sanctions
Recent Iran sanctions stories have focused on weapons procurement, individual financiers, oil waivers, and long-running congressional sanctions authority. This package is more specific: it targets the mechanics of Iran’s claimed control over Hormuz transit.
The timing also matters. Reuters reported that the announcement came the same day President Donald Trump vowed to hit Iran hard after the U.S. military said it had intercepted Iranian ballistic missiles aimed at American forces in the Middle East. The United States and Saudi Arabia also carried out joint strikes against Iran-backed groups in Iraq on Wednesday.
That puts the sanctions inside a broader escalation cycle. Washington is pairing military retaliation with financial pressure, while Iran continues trying to turn Hormuz access into leverage over shipping, oil flows, and negotiations.
The practical impact
The sanctions block property and interests in property of the designated companies and vessels that are in the United States or controlled by U.S. persons. They also generally prohibit U.S. persons from transactions involving those blocked parties unless authorized or exempt.
For shipowners, insurers, banks, and traders, the message is blunt: paying into Iran’s Hormuz insurance or transit system may create sanctions exposure. For Iran, the message is just as clear: Washington is no longer only challenging the idea of Hormuz fees in diplomacy. It is now targeting the infrastructure behind them.
The bottom line is that Hormuz has become a sanctions battlefield as well as a military and shipping one. Iran tried to formalize control through insurance and transit services. The United States just answered by blacklisting the network.