The OFAC 50 percent rule, explained for screening teams

Most sanctions screening stops at the list. A name either appears on the OFAC Specially Designated Nationals list or it does not. The 50 Percent Rule is the reason that is not enough. Under guidance published by the US Treasury’s Office of Foreign Assets Control, an entity can be blocked without ever being named, purely because of who owns it. This post explains what the rule says, how the arithmetic works when ownership is split or indirect, and what a screening team needs to apply it consistently.

Key takeaways

• OFAC treats any entity owned 50 percent or more, in aggregate, by one or more blocked persons as blocked itself, whether or not it is listed.
• The rule is about ownership, not control. A blocked person who controls a company through a minority stake does not trigger the rule, although OFAC warns that such entities may be designated later.
• Ownership is aggregated across all blocked owners, and it flows through chains when an intermediate entity is itself blocked.
• Applying the rule requires an ownership graph, not a name list. AdverseMe traces ownership to depth six and computes the 50 percent test across each chain.

What the guidance says

OFAC’s Revised Guidance on Entities Owned by Persons Whose Property and Interests in Property Are Blocked, issued in August 2014, sets out the principle. The property and interests in property of an entity are blocked if one or more blocked persons own, directly or indirectly, 50 percent or more of that entity. The entity does not need to appear on the SDN list. US persons are prohibited from dealing with it in the same way they are prohibited from dealing with the listed owner.

Two points in that sentence carry most of the weight. The first is “in the aggregate”. Ownership held by several different blocked persons is added together. The second is “directly or indirectly”. Ownership that passes through one or more intermediate companies still counts, subject to the way OFAC treats intermediate entities, which we cover below.

OFAC has also been explicit that the rule speaks to ownership and not to control. An entity that a blocked person runs, directs or influences without holding 50 percent of it is not automatically blocked under this rule. OFAC has said that it may designate such entities in future and that US persons should be cautious when dealing with them. So a team should still document the relationship, but the legal consequence is different.

How aggregation works

Consider a company with three shareholders. A blocked person holds 30 percent, a second blocked person holds 20 percent, and an unrelated investor holds the remaining 50 percent. Neither blocked person crosses the threshold alone. Together they hold exactly 50 percent, and under OFAC’s guidance the company is blocked.

This is the case most manual reviews miss, because it requires the reviewer to know that two separate shareholders are both blocked and to add their stakes. A tool that checks each shareholder in isolation and reports two “partial” hits has left the conclusion to the analyst.

How indirect ownership works

Indirect ownership is where the arithmetic gets careful. OFAC’s published examples describe it in terms of chains.

If a blocked person owns 50 percent or more of Entity A, then Entity A is blocked. If Entity A in turn owns 50 percent or more of Entity B, then Entity B is blocked too, because a blocked entity’s holdings count as blocked ownership. The chain can continue as far as the ownership does.

The chain breaks when an intermediate entity is not itself blocked. In OFAC’s own example, if a blocked person owns 25 percent of Entity A and 25 percent of Entity B, and A and B each own 50 percent of Entity C, Entity C is not considered blocked under the 50 Percent Rule, because neither A nor B is blocked. The blocked person’s economic interest in C may look substantial, but the rule follows blocked entities down the chain rather than multiplying percentages.

Aggregation and chains combine. If a blocked person owns 50 percent of both A and B, and A and B each own 25 percent of C, then A and B are both blocked, their 25 percent stakes in C are aggregated, and C is blocked.

Why this matters outside the United States

The rule is OFAC’s, but its reach is wider than US persons. Banks and payment providers in the Gulf, Europe and Asia that clear in dollars or hold correspondent relationships with US banks tend to apply it in practice. The EU and the UK operate related concepts that look at ownership or control, and the UK’s guidance uses a 50 percent ownership test alongside a control test. A screening team serving customers in several jurisdictions will usually apply the strictest reading, which in practice means computing the OFAC test on every ownership chain and flagging control relationships separately.

For teams in the UAE, the practical effect is that a counterparty can pass a name check against OFAC, the UN Consolidated List and the UAE Local Terrorist List and still be a blocked entity because of its shareholders. The list check is necessary, not sufficient.

What a screening tool needs to do

Applying the rule consistently needs four things that a name-matching engine does not have.

First, an ownership graph. You need officers, parents and beneficial owners, traced far enough that a chain of holding companies does not hide the blocked owner. AdverseMe’s ownership graph traces these relationships to depth six.

Second, a screen of every node, not just the subject. Each shareholder and each parent has to be checked against the sanctions feeds, otherwise there is nothing to aggregate. AdverseMe checks each entity in the graph against the 13 official sanctions feeds on its coverage page.

Third, the computation. Once blocked nodes are identified, the tool has to add their stakes, follow chains through entities that are themselves blocked, and stop at entities that are not. AdverseMe computes the 50 percent test across each chain rather than reporting a single “ownership risk” flag.

Fourth, honesty about inferred data. Registry filings are often incomplete and some edges are inferred from secondary sources. AdverseMe draws inferred edges dashed, never as registry fact, so a reviewer can see which part of a chain rests on a filing and which on an inference.

Common mistakes

• Treating 49 percent as safe. It is not blocked under the rule, but OFAC has said it may designate such entities and expects caution. Record the finding.
• Confusing control with ownership. Board seats, voting agreements and management contracts matter for other regimes and for risk, but they do not trigger the 50 Percent Rule.
• Multiplying percentages down a chain. The rule follows blocked entities, not fractional economic interest.
• Screening the subject and stopping. Without screening the shareholders there is nothing to aggregate.
• Failing to re-check. A shareholder can be designated after onboarding. AdverseMe’s monitoring re-screens only what changed in each sanctions list version, so a new designation of a parent surfaces without re-running the whole book.

Putting it on the record

A regulator or auditor asking about a blocked-by-ownership finding will want to see which shareholders were checked, which lists they matched, how the stakes were added and which edges were inferred. AdverseMe’s Engine Trace records every source searched and every match kept or dropped, and the PDF report lays the ownership chain and the arithmetic out for the file.

If you want to see how the rule is computed on a live ownership chain, get started with a plan from the pricing page and screen a company whose shareholders you already know.