Sanctions and Compliance Risks for Hormuz Transit

Published: 1 April 2025 · Last updated: 31 October 2026

The Strait of Hormuz sits at the intersection of some of the most complex sanctions regimes in the world. Operators transiting the corridor must navigate restrictions imposed by the United States, the European Union, the United Kingdom, and the United Nations, any of which can affect counterparties, cargo, financing, and insurance. This overview summarises the key compliance risks and the steps operators should take before transit.

The sanctions landscape in the Gulf region

The Gulf region is subject to overlapping sanctions programmes targeting Iran, certain entities in Yemen, and, in different contexts, parties connected to the financing of terrorism and weapons proliferation. These programmes are administered by different authorities in different jurisdictions, but they share a common practical consequence: a vessel that touches a sanctioned party — as owner, charterer, cargo receiver, port, or financing bank — risks sanctions exposure for its commercial counterparties worldwide.

OFAC and the SDN List

The Office of Foreign Assets Control (OFAC), a bureau of the US Treasury, administers the most widely observed sanctions programme affecting Gulf shipping. OFAC maintains the Specially Designated Nationals and Blocked Persons List (SDN List), which names individuals, companies, and vessels that US persons — and, in some programmes, non-US persons — are prohibited from dealing with.

Vessels appear on the SDN List by name, IMO number, and flag. A vessel that has been SDN-listed is commonly called a “dark fleet” vessel or a “sanctioned tanker” in press coverage. US dollar transactions, and many USD-correspondent bank transfers, are prohibited if they involve SDN-listed parties. Operators should screen their vessel, charterer, cargo receiver, and all agents against the SDN List before committing to a Hormuz transit voyage.

The OFAC SDN List is searchable free of charge at the OFAC website.

UN Security Council sanctions

The United Nations Security Council has imposed sanctions on Iran under multiple resolutions, most recently consolidated under UNSCR 2231 following the Joint Comprehensive Plan of Action (JCPOA). These sanctions affect arms transfers, certain dual-use goods, and nuclear-related activities. The UN sanctions regime is implemented by all UN member states through domestic legislation.

Operators should note that UNSCR 2231 also imposes restrictions on Iranian ballistic missile-related activities and certain individuals. Chartering a vessel to carry cargo for UN-designated individuals or entities is prohibited regardless of the flag state.

EU and UK sanctions

The European Union maintains its own Iran sanctions regime, implemented through Council Regulation (EU) No 267/2012 and subsequent amendments. The EU regime includes asset freezes, travel bans, and restrictions on financial transactions with designated Iranian entities, as well as restrictions on the supply of petroleum products and petrochemical equipment.

Post-Brexit, the United Kingdom operates its own autonomous sanctions regime under the Sanctions and Anti-Money Laundering Act 2018. The UK Iran sanctions list is similar in scope to the EU list but is administered separately by the UK Office of Financial Sanctions Implementation (OFSI). Operators with UK-domiciled group companies, UK P&I club cover, or London-market insurance must assess UK sanctions exposure independently.

Vessel vetting and counterparty due diligence

Leading sanctions compliance practice in the shipping industry involves screening all counterparties — charterer, sub-charterer, cargo receiver, shipper, port agent, and financing bank — before fixture. Oil majors and major commodity traders typically conduct vessel vetting through commercial services such as OCIMF's SIRE programme or the CDI Chemical Distribution Institute.

For independent operators, a minimum screening checklist should include:

• OFAC SDN List check for all named parties
• EU consolidated sanctions list check
• UK OFSI consolidated list check
• UN consolidated sanctions list check
• Checking the vessel's own IMO number against all lists
• Confirming the cargo origin and destination are not in a comprehensively sanctioned jurisdiction

P&I club cover under sanctions

Most P&I clubs exclude cover for voyages in breach of sanctions. If a vessel is found to be carrying cargo for a sanctioned entity, or if its owner or charterer is sanctioned, the P&I club may disclaim liability for claims arising from that voyage. Operators should notify their P&I club of any unusual counterparty or cargo profile before transit and obtain confirmation that cover is not excluded.

Flag state obligations

Flag state administrations are responsible for ensuring that vessels on their registry comply with applicable UN sanctions. Some flag states have enacted secondary legislation requiring vessels to obtain flag state approval before carrying cargo originating from or destined for sanctioned jurisdictions. Operators should check their flag state's specific requirements.

Practical compliance steps before Hormuz transit

1. Screen all counterparties against OFAC, EU, UK, and UN lists before fixture
2. Confirm cargo origin and destination country are not under comprehensive sanctions
3. Check the vessel's own IMO number on all major sanctions lists
4. Notify your P&I club and confirm cover is not excluded
5. Confirm your flag state has no specific prohibition on the voyage
6. Retain screening records as evidence of due diligence
7. Consider obtaining sanctions legal advice if any counterparty profile is unusual

Official guidance sources

Authoritative information on sanctions applicable to Gulf shipping is published by:

• OFAC (US Treasury) — including shipping-specific FAQs and guidance documents
• UN Security Council Sanctions Committee
• UK OFSI
• FATF (Financial Action Task Force) — guidance on trade-based money laundering in the maritime sector