The OFAC 50 Percent Rule Explained: How Ownership Extends Sanctions in 2026

The OFAC 50 Percent Rule is one of the most misunderstood — and most consequential — pieces of U.S. sanctions law. In one sentence: any entity that is owned, directly or indirectly, 50 percent or more in the aggregate by one or more blocked persons is itself considered blocked, even if it never appears on the SDN list by name. Miss this, and you can transact with a fully sanctioned company while every screening tool tells you the counterparty is clean.

OFAC codified the rule in its August 13, 2014 guidance, and it applies across every sanctions program administered by the Office of Foreign Assets Control — Russia, Iran, Venezuela, counter-narcotics, counter-terrorism, and every regional program. If a Specially Designated National owns 50 percent of Company A, and Company A owns 50 percent of Company B, then Company B is also blocked by operation of law, and so is any subsidiary Company B controls at the 50-percent threshold.

The word 'aggregate' is doing enormous work in the rule. Two SDNs who each own 30 percent of a company together own 60 percent — the company is blocked. Three SDNs at 20 percent each combine to 60 percent — the company is blocked. This is why simple SDN name matching on the counterparty alone is not enough. You have to unwind the ownership chain, identify every ultimate beneficial owner (UBO), and check every one of them against sanctions lists, then aggregate their combined stakes.

Control alone — for example a minority owner who holds board seats, veto rights, or golden shares — is not covered by the 50 Percent Rule specifically. However, OFAC has separately warned that dealing with entities controlled but not majority-owned by SDNs is still high risk and may warrant a specific license. Some sector-specific rules (notably Directive 4 under the Russia program) capture control-based relationships explicitly. Treat control-based positions as a red flag even when the strict 50-percent math doesn't trigger the rule.

In practice, the compliance workflow looks like this. For every new customer, vendor, or counterparty, collect beneficial ownership above 25 percent (the FinCEN CDD threshold). Screen the direct entity against OFAC SDN and Consolidated lists. Screen every UBO and every intermediate holding company. Sum any SDN stakes; if they aggregate to 50 percent or more at any layer, treat the entity as blocked. Document the ownership chart, the search results, and the decision — regulators expect a defensible file, not just a clean screening report.

The rule cuts both ways: an entity that was clean yesterday can become blocked overnight if a new designation lands on one of its owners. That's why point-in-time onboarding checks are insufficient. A serious program re-screens counterparties whenever OFAC updates the SDN list — often multiple times per week — and re-runs the 50-percent aggregation logic against fresh data.

SanctionsScreening runs fuzzy-matched searches across OFAC SDN, OFAC Consolidated, EU, UK, and UN lists in a single query, updated every few hours from the source feeds. Screen your counterparty and each UBO from the same interface, export a PDF audit report of every check, and re-run the ownership aggregation whenever the underlying lists change. Start with a free search at sanctionsscreening.io, or see the pricing page for batch CSV screening and API access.