Iran Escalates Pressure on Shadow Fleet with Seizure Threats Against 45 Blacklisted Vessels

## Iran Threatens 45 Blacklisted Ships with Seizure and Fines Iran has escalated its campaign against vessels it accuses of breaching Strait of Hormuz transit regulations, warning charterers and operators that 45 blacklisted ships face seizure and financial penalties if they continue operating in defiance of Tehran's directives, according to Seatrade Maritime. The move marks a significant hardening of Iran's posture toward what it characterises as non-compliant shipping traffic transiting the strategically vital waterway. The Strait of Hormuz remains one of the world's most critical maritime chokepoints, with approximately 20% of global oil trade passing through its narrow passage daily. Of particular concern to the industry is the revelation that at least 14 of the 45 vessels named on Iran's blacklist have previously been targeted in attacks — a detail that underscores the very real physical risk facing crews and operators associated with these ships. The overlap between Iran's sanctions list and vessels with a history of hostile incidents suggests a coordinated strategy to deter what Tehran views as sanctions-busting activity. ### Implications for Charterers and Operators The warnings place charterers in a difficult legal and commercial position. Dealing with blacklisted vessels could expose companies to Iranian enforcement action, while the threat of seizure adds a layer of operational risk that war risk underwriters and P&I clubs will be closely monitoring. Shipping industry observers note that Iran has previously demonstrated willingness to act on such threats, having seized or harassed a number of vessels in recent years under various legal pretexts. The latest warning is likely to prompt renewed scrutiny of vessel vetting procedures among charterers active in the Gulf region. ### Broader Context The development comes against a backdrop of ongoing geopolitical tension in the Gulf, with the shadow fleet — vessels operating outside conventional regulatory and insurance frameworks to move sanctioned cargoes — continuing to attract international attention. Western governments and maritime regulators have repeatedly warned of the safety and environmental risks posed by ageing, under-insured tonnage operating in the region. For maritime professionals operating in or near the Strait of Hormuz, Iran's latest blacklist represents a material escalation that warrants careful legal review and enhanced due diligence on vessel selection and voyage planning. *Source: Seatrade Maritime*