Beneficial Owner (BO) / Ultimate Beneficial Owner (UBO)
The natural person who ultimately owns or controls a customer, or on whose behalf a transaction is conducted — typically defined by an ownership or control threshold (commonly 25%) applied through however many corporate layers separate them from the account. Also known as the Ultimate Beneficial Owner (UBO).
A company can be sanctioned without ever appearing on a list. Under OFAC’s 50% Rule, an entity owned 50% or more in aggregate by one or more blocked persons is itself blocked, even though no designation names it directly. The EU applies a comparable aggregation test (lowered to 50% or more in July 2024); the UK’s threshold is more than 50% held by a single designated person, without aggregation across multiple designators unless a joint arrangement or common control is shown. Name screening alone cannot surface any of these entities — it tells you nothing about who owns the customer.
That is why beneficial ownership is a separate workstream from name screening, not a variant of it: it requires tracing an ownership or control chain through however many holding companies separate the account from the person who actually controls it, then screening every person found in that chain in their own right. A KYC programme that verifies the named applicant but never resolves the ownership structure behind them has closed the front door and left the back one open.