Four groups. Every field where you expect it.
Once a company is linked, the Business Essentials app writes registry data straight into HubSpot properties, grouped so you can actually find them. Open Actions, then View all properties, and you will see four Business Registry groups in the right-hand panel: Identification, Core data, Contact and Provenance. This tutorial walks through each group, what it tells you about a company, and which properties you can build lists, views and workflows on.
For a complete overview of all the custom properties, check this blog post.