Identifiers and data quality
Secondary identifiers separate targets from namesakes, and ownership rules extend a designation to companies the list never names.
L0 Explain simply
An everyday analogy: two problems haunt any name-based check. First, many people share names — a name alone is like a smudged fingerprint, and you need more points of comparison: a birthdate, a birthplace, a passport number. Second, a banned person can stand behind a company whose name appears on no list at all, the way a landlord can own a shop that trades under a different sign. Sanctions rules answer both problems: list entries carry extra identifying details so the right person is caught and the wrong one released, and ownership rules extend the ban to companies that listed persons own — even though you will not find those companies by reading the list itself.
L1 Core concepts
Secondary identifiers are the attributes beyond the name: date and place of birth, nationality, gender, addresses, passport and national ID numbers for individuals; registration numbers, incorporation details, and addresses for entities. They are what turns a name hit into a decision, in either direction. Ownership and control rules extend obligations past the list itself. Under OFAC's 50 percent rule, an entity owned 50 percent or more, directly or indirectly, in the aggregate by one or more blocked persons is itself blocked — even if it appears on no list. The EU applies an ownership test set at 50 percent or more of proprietary rights, aggregated across designated persons, and adds a separate control test covering entities a designated person dominates by other means.
L2 Practitioner view
The operational consequence: screening the list is necessary but not sufficient. Ownership exposure cannot be caught by name matching, because the risky entity's name is not on the list — it is caught through customer due diligence, beneficial ownership data, and specialised ownership research, and through investigators asking "who stands behind this counterparty" when other red flags appear. On the identifier side, the constraint is usually the bank's own data: a customer record without a birthdate cannot be distinguished from a listed namesake, so weak reference data converts directly into alert volume and slower payments. Ownership analysis is also where legal judgment enters — percentages, indirect chains, and control indications rarely come neatly labelled, and institutions take legal advice before concluding an unlisted entity is in scope.
L3 Technical details
The mechanics reward precision. OFAC aggregation: if blocked person X owns 25 percent of an entity and blocked person Y owns another 25 percent, the entity is blocked, because ownership by blocked persons is summed. Indirect ownership follows majority-owned links: an entity majority-owned by a blocked-in-aggregate company is analysed as owned by blocked persons through it. OFAC's rule speaks to ownership only — control without majority ownership does not automatically block an entity under US rules, though it raises risk and can lead to designation. The EU tests both ownership (50 percent or more of proprietary rights, aggregated) and control, with published indications such as the power to appoint management or de facto dominant influence. The two frameworks resemble each other but are not interchangeable; analysis is done per regime.
Sources & standards2
- Official requirement
Revised guidance on entities owned by persons whose property and interests in property are blocked (the 50 Percent Rule) ↗ — US Department of the Treasury, Office of Foreign Assets Control · Revised guidance on entities owned by blocked persons; aggregation and indirect ownership
The rule speaks to ownership, not control; OFAC FAQs 398-402 elaborate on aggregation and indirect ownership.
- Official requirementST 11623/24
EU Best Practices for the effective implementation of restrictive measures ↗ — Council of the European Union · Ownership and control criteria for EU restrictive measures
Subject to permanent review by the Council; only the Court of Justice of the EU can authoritatively interpret EU law.
Sources for this topic4
- Official requirement
Revised guidance on entities owned by persons whose property and interests in property are blocked (the 50 Percent Rule) ↗ — US Department of the Treasury, Office of Foreign Assets Control · OFAC guidance on entities owned by blocked persons (50 percent rule)
The rule speaks to ownership, not control; OFAC FAQs 398-402 elaborate on aggregation and indirect ownership.
- Official requirement
OFAC Frequently Asked Questions ↗ — US Department of the Treasury, Office of Foreign Assets Control · FAQs on the 50 percent rule and aggregate ownership
FAQs are added, amended, and renumbered over time; always check the live page for current numbering and text.
- Official requirementST 11623/24
EU Best Practices for the effective implementation of restrictive measures ↗ — Council of the European Union · Ownership and control assessment
Subject to permanent review by the Council; only the Court of Justice of the EU can authoritatively interpret EU law.
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal
What this simplifies: Ownership examples use round percentages and short chains; real structures involve trusts, nominees, and partial data. Whether a specific entity is in scope of any regime is a legal conclusion this site never draws — the linked scenario shows an escalation, not a determination.
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.
Deepest material on this page: L3 — Technical details. Where a topic stops short of implementation depth, that is a deliberate coverage decision, not an oversight — see coverage.