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Shadow fleets, shell layers: reading the largest vessel designation waves
The largest vessel designation waves of the past eighteen months listed more than a hundred tankers at a time. The ownership graphs behind them, nested shells, re-flagged hulls and recycled managers, say a lot about how shadow fleets layer ownership and where maritime screening goes next.
· 6 MIN READ · BY THE KYCK DESK
Designations by the hundred
A vessel designation wave is a single sanctions action that lists dozens or hundreds of ships at once, rather than one hull at a time. Since the start of 2025 it has become the main instrument against the shadow fleet carrying Russian and Iranian oil: a January 2025 US action listed 183 vessels, the EU added 74 ships in its 16th package, 189 in the 17th and 105 in the 18th, and the UK has sanctioned batches of up to 100 vessels in one announcement.
The scale changes the job. A compliance desk that used to check a fixture against a short list of named tankers now has to absorb list changes of a hundred IMO numbers overnight, and the ships that were listed rarely stay where they were: many re-flag, rename or change registered owner within weeks.
What the ownership graphs show
Behind almost every designated tanker sits the same structure. A single-ship company owns the hull, registered in a jurisdiction chosen for opacity. Above it sits a holding company, often in a second jurisdiction, and above that a set of nominees. The technical manager and the commercial operator are separate companies again, frequently in the Gulf, South Asia or Hong Kong, and the same managers reappear across dozens of listed ships.
Two patterns matter most for screening. Nested shells mean the name on the fixture is almost never the name on a sanctions list: the listed party is two or three layers up, or is the manager rather than the owner. Recycled managers mean a clean-looking ship can be run by a company that already manages five designated hulls, which is exactly the kind of association regulators expect a charterer to have noticed.
Re-flagging and the false-flag problem
After a designation the flag is the first thing to change. Ships move between small registries, some of which have publicly disavowed the vessels claiming their flag, and a growing number sail under flags that no registry has issued at all. A screening process that trusts the flag shown on an AIS feed or a charter party is checking a field that the counterparty controls.
The practical response is to treat the IMO number as the only stable identifier, to keep the flag history rather than the current flag, and to treat a recent flag change as a risk signal in its own right.
What it means for maritime screening
Screening the IMO number against the lists is the floor, not the ceiling. The ownership chain has to be screened as a set: registered owner, beneficial owner, technical manager, commercial manager and the insurer providing cover. Each of those can be the listed party while the ship itself is not.
Ownership events need to trigger a re-screen. When the registered owner or the manager changes, the risk of the fixture changes, even if no list moved that day. And the evidence has to be kept: which lists were checked, which ownership layers were seen, at what time. That is the record a desk produces when a regulator asks why a fixture went ahead.
KYCK screens vessels by IMO number together with the companies around them, records the ownership layers it saw and stores the result in the audit trail of the counterparty file. See how vessel screening fits into counterparty onboarding.
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