The 50 Percent Rule is OFAC guidance under which any entity owned 50 percent or more, directly or indirectly, by one or more blocked persons is itself treated as blocked, even if it is not named on the SDN list. It stretches sanctions across a wide web of unnamed subsidiaries and affiliates that a name-only screen would never catch.
What is the 50 Percent Rule, in plain English?
When OFAC blocks a person or entity, the obvious result is that dealing with the named party is prohibited. The 50 Percent Rule extends that far wider. It says that any entity owned 50 percent or more by one or more blocked persons, whether the ownership is direct or indirect, is itself treated as blocked, even though its own name never appears on the Specially Designated Nationals list.
In other words, sanctions flow through ownership. A blocked person's controlling stake in a company drags that company into the blocked category automatically, and if that company in turn owns 50 percent of another, the block flows down again. The rule reaches a whole web of unnamed subsidiaries and affiliates that inherit blocked status purely by who owns them.
Because the trigger is ownership rather than a name, compliance cannot rely on matching against a list alone. The rule effectively demands beneficial-ownership analysis: you have to understand who really owns a counterparty, and by how much, to know whether it is blocked. A clean-looking name on an entity is no assurance if a blocked person sits behind it.
How ownership adds up
The 50 percent threshold is measured in aggregate and through layers, which is where the traps live:
- Direct — A single blocked owner. One blocked person holding 50 percent or more of an entity makes that entity blocked.
- Aggregate — Several stakes combine. Multiple blocked persons' stakes add together, so partial holdings can cross the line jointly.
- Indirect — Ownership through layers. A blocked entity's own 50 percent stake in a further entity passes the block down the chain.
- Result — Treated as blocked. The affected entity is blocked in full, even though its name is nowhere on the SDN list.
Who is involved?
Who | Their role |
OFAC | Issues the guidance and enforces it, expecting firms to look through ownership, not just names. |
Blocked persons | SDN-listed owners whose stakes drag unnamed entities into blocked status. |
The unnamed entity | A subsidiary or affiliate that is blocked by ownership despite never being listed. |
The regulated firm | Must perform beneficial-ownership analysis to catch entities blocked only by the 50 percent test. |
What it looks like in practice
In practice
A firm is onboarding a new corporate counterparty. Its name is nowhere on the SDN list, and a straightforward name screen comes back clean, so on the surface there is nothing to flag.
Beneficial-ownership analysis tells a different story. Two separate blocked persons each hold a 30 percent stake in the counterparty. Individually neither reaches 50 percent, but the rule aggregates their holdings, and together they own 60 percent. That crosses the threshold, so the counterparty is treated as blocked even though it was never named. A firm relying on name-only screening would have onboarded a blocked entity without ever realizing it.
Why it matters to operators
The 50 Percent Rule is a reminder that sanctions are about substance, not just names. The named SDNs are only the visible tip; behind them can sit a large web of subsidiaries and affiliates that are just as blocked, purely by ownership. A program that screens names against the list and stops there will miss all of them, and OFAC expects firms to look through to beneficial ownership rather than take a clean name at face value.
The main traps are indirect and aggregated ownership. Blocked status can pass down through layers of entities, and multiple partial stakes can combine to cross 50 percent even when no single owner does. Both are invisible to a name-only screen, which is why the rule effectively mandates real ownership analysis. Getting this wrong means dealing with a blocked entity and inheriting the serious consequences that follow.
What to watch for
- Aggregated stakes. Multiple blocked persons' holdings add together, so several partial stakes can cross 50 percent jointly.
- Indirect ownership. Blocked status passes down through layers, so a chain of entities can hide a blocked owner several levels up.
- Name-only blind spot. An entity blocked only by the 50 percent test never appears on the list, so name screening alone will miss it.
- Beneficial-ownership analysis. The rule effectively requires understanding who really owns a counterparty and by how much.
- Blocked in full. An entity that meets the test is treated as blocked entirely, not partially, regardless of its unnamed status.
Quick questions
Does the entity have to be on the SDN list?
No. That is the whole point. An entity owned 50 percent or more by blocked persons is treated as blocked even if its own name never appears on the list, which is why name-only screening misses it.
Do multiple owners' stakes combine?
Yes. The rule aggregates the holdings of multiple blocked persons, so two owners with 30 percent each, or several smaller stakes, can jointly cross the 50 percent threshold and block the entity.
What about indirect ownership?
It counts too. A blocked entity's 50 percent stake in another entity passes the block down the chain, so ownership through layers can make an entity blocked even when the connection is not obvious.
What if ownership is below 50 percent?
The strict 50 percent test may not be met, but significant control below the threshold can still raise serious concerns, and OFAC cautions firms to be careful with entities blocked persons influence even without majority ownership.
How do firms comply with it?
By performing beneficial-ownership analysis: understanding who really owns and controls a counterparty, aggregating blocked stakes, and tracing ownership through layers rather than relying on a name match.
Is a 50 percent owned entity partially or fully blocked?
Fully. Once the threshold is met, the entity is treated as blocked in its entirety, the same as if it had been named directly, not blocked in proportion to the stake.
Go deeper
- OFAC, US Treasury ↗ — Administers US sanctions programs, the SDN list, and licensing.
- European Banking Authority ↗ — EU banking regulator. Strong Customer Authentication under PSD2 and AML guidance.