What is OFAC's 50% rule,
and why does ownership matter?
A company can be blocked under US sanctions law without its name ever appearing on the SDN List, simply because of who owns it. This guide explains OFAC's 50 percent rule, how ownership gets aggregated, and how to check for it before a transaction goes through.
6 min read · Sanctions screening basics
What the 50% rule actually is
Unlike the SDN List or the other lists covered elsewhere on this site, the 50 percent rule is not a list at all. It is a piece of OFAC guidance, first issued in 2008 and substantially clarified in 2014, that any entity owned 50 percent or more, directly or indirectly, in the aggregate, by one or more blocked persons is itself treated as blocked, whether or not its own name has ever been separately designated.
The word "aggregate" is doing real work here. If one blocked person owns 25 percent of a company and a second blocked person owns another 25 percent, the company is considered blocked, even though neither individual holder crosses 50 percent alone. OFAC has also clarified, in guidance updated in 2022, how this applies through layered corporate structures: if a blocked person's ownership reaches an entity indirectly, through one or more intermediate companies that are themselves majority-owned by blocked persons, the downstream entity is blocked too.
Why there is no list to check against
This is the detail that makes the 50 percent rule genuinely harder to comply with than name-based screening. OFAC does not publish, and has never published, a comprehensive registry of entities blocked solely under this rule. The compliance burden sits entirely with the company doing the transacting, which has to work out the ownership structure itself.
- An entity can be blocked today and unblocked tomorrow purely because an ownership stake changed hands, with no announcement from OFAC either way.
- The rule applies on a strict liability basis, the same as direct SDN designations; not knowing about the ownership structure is not a defense.
- Civil penalties for a violation follow the same framework as other OFAC violations and can reach several hundred thousand dollars per violation.
- An entity that falls just under the 50 percent threshold is not automatically low risk; OFAC retains authority to separately designate entities it considers controlled by blocked persons even below that line.
How the aggregation and indirect ownership actually work
| Scenario | Result |
|---|---|
| One blocked person owns 50% of Entity A | Entity A is blocked. |
| Two blocked persons each own 25% of Entity A | Entity A is blocked; the stakes are aggregated regardless of which sanctions program each holder is designated under. |
| Blocked Person X owns 50% of Entity A, and Entity A owns 50% of Entity B | Entity B is blocked indirectly through X's ownership of A. |
| A blocked person holds a 30% stake with no other blocked co-owners | Not automatically blocked under this rule, though OFAC may still designate the entity separately if it considers it controlled by the blocked person. |
How ownership screening works in practice
Because there is no list to consult, checking for 50 percent rule exposure means mapping beneficial ownership: identifying who ultimately holds equity in a counterparty, through however many layers of holding companies sit in between, and then checking each of those holders against the SDN List and other relevant designations.
This is realistically not something to do on every low-value transaction. It becomes worthwhile as transaction size, counterparty jurisdiction risk, or corporate opacity increases, and it needs to be rechecked when ownership changes, not treated as a one-time determination made at onboarding.
Common mistakes
Screening only the entity's own name
A clean name check tells you nothing about who sits behind the entity. The blocking can exist entirely at the ownership layer.
Assuming a single sub-50% stake is automatically safe
Other blocked holders can push the aggregate over the threshold even if no single owner crosses it alone.
Stopping at the first layer of ownership
Indirect ownership through intermediate entities counts under OFAC's updated guidance. Tracing only the immediate shareholder misses it.
Getting started
- Reserve ownership tracing for transactions where the value or risk actually warrants it; it is not practical at every scale.
- Map beneficial ownership through intermediate holding entities, not just the immediate shareholder of record.
- Aggregate all blocked holders' stakes together, regardless of which sanctions program each is designated under.
- Re-check ownership when a transaction is renewed or materially changes, since blocked status can shift without any public notice.
The 50 percent rule rewards structural transparency and proactive diligence precisely because OFAC does not do the lookup for you. A name check alone was never designed to catch it.
See ownership structures
traced, not just names checked.
Enthron maps beneficial ownership alongside name screening, so aggregate blocked ownership surfaces before it becomes a violation.