The formal shareholder may be another legal entity, and behind it—a third entity registered in another jurisdiction. The beneficial owner is at the end of this chain: the person who actually benefits from the company's activities or determines its decisions.
Beneficial owner disclosure is a standard requirement in anti-money laundering compliance. Banks establish ultimate owners when opening accounts for corporate clients, and companies must provide this information upon request from authorized authorities.
For investors, this indicator has analytical value. Opaque ownership structures increase the risk that decisions are made in the interests of a specific individual rather than all shareholders, and complicate the assessment of related-party transactions. If the ultimate owners of an issuer cannot be identified, this is itself a risk factor to consider alongside financial metrics.