Bad actors frequently use complex corporate shells to hide ownership stakes held by sanctioned individuals or SDNs. To prevent evasion, both OFAC and the EU enforce the 50 Percent Rule.
Applying the 50 Percent Rule
The rule states that any corporate entity owned 50% or more in the aggregate by one or more blocked persons or SDNs is automatically considered sanctioned itself. This status applies even if the entity is not explicitly named on a regulatory sanctions list.
Mathematical Example of Aggregation
Corporate Entity Alpha (Unlisted)
  |- SDN Investor A holds a 30% Equity Stake
  |- SDN Investor B holds a 25% Equity Stake
  |- Clean Investor C holds a 45% Equity Stake
Total Blocked Ownership = 30% + 25% = 55%
Outcome: Entity Alpha is automatically blocked by operation of law.

Compliance teams cannot rely solely on basic name matching against official list feeds. They must perform deep beneficial ownership reviews to identify hidden SDN structures and prevent sanctions violations.
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