Castellum.AI's High-Risk Ownership (HRO) dataset covers the OFAC 50 Percent Rule, which stipulates that "any entity owned in the aggregate, directly or indirectly, 50 percent or more by one or more blocked persons is itself considered to be a blocked person. The property and interests in property of such an entity are blocked regardless of whether the entity itself is listed in the annex to an Executive order or otherwise placed on OFAC's list of Specially Designated Nationals ("SDNs")." The EU and UK have adopted similar regulations.
Castellum.AI's HRO database contains compiled ownership records to flag direct and indirect ownership by sanctioned parties. This includes calculating ownership multiple levels of corporate ownership from the sanctioned individual or entity, enabling users to effectively screen counterparties and identify 50 Percent Rule risk.