Iran blacklists 45 commercial tankers in Strait of Hormuz, threatening cargo seizures

Blacklist of commercial tankers

The Persian Gulf Strait Authority, a body created by Iran to regulate maritime movement through the waterway, announced on Sunday night, 23 August 2026, that between 45 and 46 commercial tankers have been placed on a formal blacklist. The announcement, published on platform X, stated that the targeted vessels committed violations of Iranian transit protocols in the Strait of Hormuz. Under the newly announced enforcement measures, non-compliant vessels face administrative fines, physical detention, and the complete confiscation of their carried cargo. The Iranian authority instructed all international cargo owners and charterers to cross-reference the updated vessel list before scheduling voyages in the Persian Gulf. Shipping companies seeking to remove their vessels from the blacklist must file formal petitions directly with Iranian maritime authorities.

Targeted fleets and management companies

The blacklist covers multiple categories of commercial energy shipping, including very large crude carriers, liquefied natural gas tankers, liquefied petroleum gas vessels, and clean petroleum product carriers. Several vessels on the registry belong to ADNOC Logistics and Shipping and its subsidiary Navig8 Tankers in the United Arab Emirates, alongside the national shipping carrier of Saudi Arabia, Bahri. The list also names vessels connected to South Korea's Sinokor, as well as Klaveness Ship Management and Stolt Tankers. Greek management firms are also featured on the registry, with vessels tied to Kyklades Maritime Corporation, Modion Maritime Management S.A., and Dynacom Tankers Management. Iranian authorities announced that any third-party vessel engaging in ship-to-ship cargo transfers with blacklisted tankers will immediately be added to the registry. Multiple vessels named in the publication were previously struck by Iranian fire during earlier transit attempts across the corridor.

Escalation and transit requirements

The measure follows diplomatic and economic friction between Washington and Tehran six months after the outbreak of war involving Iran, the United States, and Israel. The United States warned Iran of the strictest sanctions package in history, prompting Tehran to declare that any further American threats would trigger a destructive response. Although the Iranian announcement did not itemize every specific violation, Iranian officials have consistently maintained that commercial vessels must obtain formal Iranian transit permits and pay established fees for security services. When contacted by Reuters for comment on the blacklist, ADNOC declined to comment, while other shipping operators did not immediately reply. Martin Kelly, an analyst with EOS Risk, described the development to the Financial Times.

This is the first real implementation of a specific target profile in the Strait of Hormuz.

Shuttle logistics and escort operations

Prior to the outbreak of hostilities, the Persian Gulf corridor supplied approximately 20% of global daily crude oil and liquefied natural gas demand. To circumvent the heightened risk in the strait, Gulf energy exporters led by ADNOC developed shuttle routes, using smaller vessels to transport fuels through the passage to waiting supertankers anchored in the Gulf of Oman. Simultaneously, the United States maintains a naval blockade against Iran-linked shipping while organizing naval escort operations to shepherd international tankers safely through the passage. US Secretary of Energy Chris Wright reported on the volume of seaborne crude transiting the area in a statement published on platform X.

The weekly average of oil moving through the Strait exceeds 8 million barrels per day.

Commercial operators and trading houses continue assessing the security implications as both Iranian enforcement actions and American naval escorts operate concurrently across the waterway.