KYB complexities with multi-entity structures and ultimate beneficial ownership

Curious how others are handling Know Your Business (KYB) for clients with complex, multi-entity corporate structures, especially when the ultimate beneficial ownership (UBO) cascades through several layers across different jurisdictions. We've encountered situations where identifying the true UBO becomes exceptionally resource-intensive, particularly with private equity funds or trusts domiciled in jurisdictions with less transparent company registers.

Are firms finding it more efficient to utilize third-party RegTech solutions that specialize in corporate network mapping, or is this still predominantly a manual, document-heavy process for most? The cost-benefit of deep-diving into every intricate structure versus the inherent risk exposure is a constant balancing act. Any practical insights or experiences would be appreciated.