Corporate group structure

A company's place in its group. structure (added 2026-11-15) is the full graph of who controls whom, every level, exactly as GET /company/{number}/group-structure returns it on level: full: use it for anything new.

The earlier fields are unchanged and remain for existing integrations: parent_entities (the company's corporate PSCs, one level, by name), subsidiaries (companies whose corporate PSC has the SAME NAME as this company: match_method says exact_normalised_name or trigram_similarity, so these are name matches and can be a different company of that name; structure links by registration number only) and same_address (other companies at the registered office). structure is null if it could not be read; the earlier fields are still returned.

Limits of one answer: 8 levels above and 5 below, 60 companies in all (24 of them above), 10 registered owners and 25 controlled companies for any one company. Where a limit is reached truncated is true and a more node says where and how many.