Captive
From ACT Wiki
1. Groups of companies - insurance - noun.
Abbreviation for captive insurance company.
2. Groups of companies - noun.
Any service company that is part of a group of companies, whose customers are mainly - or entirely - other companies in the group.
3. Groups of companies - adjective.
Describing any entity is part of a group of companies, whose customers are mainly - or entirely - other companies in the group.