Reviewed: 22 August 2026
A sanctions-list search can tell you whether the vessel or entity you entered matches a record on a supported list. It cannot, on its own, establish who ultimately controls a company, explain a vessel’s behaviour or decide whether a transaction is lawful.
Where changing identity, ownership and vessel behaviour complicate that process, see Shadow Fleet and Sanctions: What Screening Can and Cannot See.
That distinction matters because sanctions exposure does not always appear under the name on a fixture, policy, loan or invoice. A vessel may have changed its name. A company may sit below a designated owner. A transaction may involve a restricted cargo, service or jurisdiction even though none of the names produces a direct match.
For ship operators, charterers, traders, insurers and financiers, a defensible process therefore has three different parts: list screening, ownership and control due diligence, and investigation of relevant behaviour or transaction details. They inform one another, but they do not answer the same question.
Start with the decision and its jurisdictional connections
Before searching a name, establish what you are assessing and why. The parties, jurisdictions and activity involved determine which rules and lists may be relevant.
A useful starting record may include the vessel and its IMO number; its registered owner, operator and managers; the charterer, cargo interests and material counterparties; the ports and jurisdictions involved; and the banks, insurers or other services supporting the transaction. The appropriate scope depends on the facts and the organisation’s legal and compliance obligations.
No single list is a universal maritime clearance list. A US-dollar payment, UK person, EU operator, flag, port call or other connection may bring a different regime into consideration, but the legal effect cannot be inferred from geography or currency alone. Where the applicable rules or permissions are unclear, the organisation needs appropriate sanctions advice.
List screening asks whether the record matches
List screening compares a vessel or entity with records published by sanctions authorities. Names matter, but they are often not enough. Transliteration, abbreviations, former names and common company styles can produce both missed matches and false positives.
For a vessel, the IMO number is usually the strongest available identifier because it remains with the hull through changes of name and flag. For a company or person, useful secondary identifiers can include registered address, country, date of incorporation or birth, registration numbers and aliases supplied in the official record.
A potential name match is the beginning of resolution, not the end. The next step is to compare the available identifiers and determine whether the result relates to the vessel or entity being assessed. A weak name similarity and an exact IMO-number match should not be treated as equivalent.
Verihelm currently screens vessel and entity searches against supported US, UK and EU sanctions-list records. It checks the primary names and the aliases supplied in those records, using identifiers such as an IMO number where they are available. The result shows potential list matches for the customer to examine; it is not a legal clearance, an ownership opinion or a judgement on the wider transaction.
The underlying authorities remain the source of truth for their designations and restrictions:
- OFAC Sanctions List Service
- UK Sanctions List
- European Commission sanctions resources and consolidated financial sanctions list
Ownership and control due diligence asks who sits behind the name
A clean list result does not establish that an entity is outside sanctions restrictions. Some regimes extend restrictions to entities owned or controlled by a designated person even when the entity is not named on the list itself.
The tests are not interchangeable. OFAC’s 50 Percent Rule treats an entity as blocked where blocked persons own, directly or indirectly and individually or in aggregate, 50 per cent or more of it. UK financial sanctions apply their own ownership and control criteria, which include majority ownership and forms of control that do not depend only on a shareholding threshold. EU measures must be considered against the relevant regulations and guidance.
This work requires information about the ownership chain and the way control is exercised. It may involve corporate records, disclosures from the counterparty and specialist data or advice. A list-screening result cannot fill gaps in that evidence.
Verihelm does not currently trace a company through its ownership structure or determine whether an unlisted entity is owned or controlled by a designated person. That assessment remains a separate due-diligence task.
Official guidance should be consulted directly, including OFAC’s guidance on entities owned by blocked persons and the UK financial sanctions guidance on ownership and control.
Behavioural investigation asks what the vessel or transaction may be doing
Vessel activity can provide a reason to look more closely, but it is not a substitute for list screening or legal analysis. AIS gaps, ship-to-ship transfers, repeated changes of flag or management, unusual routing and inconsistent documents can have legitimate explanations as well as deceptive ones.
The relevant question is whether several facts, considered together and in context, create a concern that needs to be resolved. That investigation may require movement history, cargo and transaction documents, ownership information, port records and other evidence. No single indicator proves sanctions evasion.
Verihelm’s current sanctions result does not conduct a complete deceptive-shipping or behavioural investigation. Customers should not read a clear list search as confirmation that a vessel’s activity, cargo or wider transaction presents no sanctions exposure.
Resolve the result before relying on it
When a search returns a possible match, compare the result with the information held about the subject. For a vessel, check the IMO number, current and former names, flag and other available identifiers. For an entity or person, compare addresses, jurisdictions, registration details and the aliases or identifiers in the list record.
The outcome should distinguish at least three positions: the available identifiers support the match; the available identifiers distinguish the subject from the listed party; or the information is not sufficient to resolve the result. Where the position remains uncertain or the consequence could be significant, it should be escalated under the organisation’s compliance process.
Record the information used and when the check took place. Sanctions lists change, and a result describes the records available at the time of the search. Re-screening may be appropriate when a material party or transaction detail changes, when a relevant list is updated, or before another decision is made on a continuing exposure.
A clear result is narrower than a clear transaction
The strongest screening process does not force one tool to answer every sanctions question. It uses list screening to identify possible designation matches, ownership and control work to look behind unlisted entities, and behavioural or transaction investigation when the facts call for it.
Verihelm provides a low-friction way to screen vessels and entities against its supported sanctions records and examine the potential matches returned. It helps customers see whether a listed name, alias or available identifier calls for closer attention while keeping the boundary of that result clear.
The customer and its advisers decide what the result means for the transaction.
This article provides general information and analysis. It is not legal advice, a sanctions opinion or confirmation that a transaction is permitted. Applicable rules and licensing requirements depend on the facts and jurisdictions involved.