Iran has blacklisted 45 oil tankers and cargo vessels for alleged transit violations in the Strait of Hormuz, warning that the ships face fines, detention, and cargo confiscation. The newly formed Persian Gulf Strait Authority announced the restrictions as commercial traffic through the vital waterway remains severely disrupted six months into the regional conflict.
A fresh bureaucratic and operational choke point has emerged in one of the world’s most critical maritime corridors. Iran has blacklisted 45 tankers over what officials describe as violations of transit rules within the Strait of Hormuz, placing major Gulf energy shippers directly on notice.
The announcement establishes a formal regulatory mechanism for Tehran to enforce compliance across the waterway. Commercial traffic through the strait has plummeted, remaining around 90 percent below pre-conflict levels according to data cited from the United Kingdom Maritime Trade Operations.
The Persian Gulf Strait Authority and the Target List
The blacklist was issued via an X post from the Persian Gulf Strait Authority, a newly established body created by Iran specifically to manage maritime traffic and enforce transit rules through the strait. The restricted roster reads like a comprehensive inventory of global energy transport, covering very large crude carriers, liquefied natural gas and liquefied petroleum gas tankers, and clean-product vessels.
Among the prominent companies named on the non-compliance roster are the United Arab Emirates’ ADNOC Logistics and Services, its subsidiary Navig8 Tankers, and Saudi Arabia’s national shipping carrier, Bahri. Other international operators caught in the sweep include Norway’s Klaveness Ship Management, chemical tanker specialist Stolt Tankers, and South Korea’s Sinokor.
The published register includes specific vessels such as the Kiku, Mubaraz, Minoan Pioneer, Hafeet, and Stolt Magnesium, alongside 40 other commercial ships with their designated IMO numbers detailed in the official release. While the authority’s public statements did not provide a granular breakdown of the exact rules broken by each vessel, Tehran has previously insisted that shipowners must secure official clearance before transiting the strait and pay mandatory fees for security and related services.
Penalties, Secondary Risks, and Market Disruption
Vessels appearing on the blacklist face severe financial and operational consequences. According to the maritime authority, the named ships could be fined, detained, and have their cargoes confiscated.
To widen the scope of enforcement, Tehran added a secondary restriction: any commercial ship engaging in ship-to-ship cargo transfers with a blacklisted vessel risks being added to the registry as well. This mechanism mirrors the secondary sanctions doctrine pioneered by Western nations, turning enforcement tools back onto international operators.
State-backed operators like Bahri and ADNOC L&S possess significant political backing from governments with substantial leverage over regional oil supplies. In contrast, independent operators such as Klaveness, Stolt, and Sinokor face heightened reputational and financial exposure without comparable state protection.
Cargo owners and shipowners seeking to clear their names must submit a formal request with explanatory documentation to Iranian maritime authorities. Meanwhile, commercial vessel volume in the strait remains constrained. Only four commodity vessels crossed the waterway on a recent Sunday, down from 16 days prior, while baseline traffic hovers far below historical averages.
US Naval Operations and Diverging Flow Estimates
The Iranian regulatory escalation unfolds alongside active U.S.-led naval operations designed to maintain energy flows through the region. Before the conflict, the Strait of Hormuz handled approximately 20 per cent of the world’s daily crude oil and LNG supplies.
To counter the bottlenecks, U.S.-coordinated efforts have focused on shuttling tankers quietly through the strait to fill larger supertankers waiting just outside the passage. U.S. officials maintain that export volumes remain substantial despite commercial tracking discrepancies caused by tankers switching off their AIS transponders.
Chris Wright, U.S. Secretary of Energy, stated via X that the 7-day average of oil leaving the Strait is over 8 million barrels a day, adding that thanks to the U.S. Navy, oil is unquestionably flowing through the Strait of Hormuz.
Independent commercial tracking firms report lower volumes than government figures, highlighting the tracking challenges created when vessels disable their positioning transponders. This operational friction coincides with broader geopolitical tensions, arriving just days after Washington threatened the toughest sanctions in history
against Iranian oil exports, to which Tehran promised a severe response.
