Five companies in a group almost always means five tenants configured five different ways. We run them as a single estate.

If somebody tells you your holding company can simply license Lighthouse and manage its own subsidiaries through it, treat that carefully. It is built for service providers holding delegated access into customer tenants, and every tenant must satisfy the eligibility rules before it can be onboarded. Two legitimate routes exist for a group. Either engage a provider who manages your entities through it alongside the wider toolbox, or build your own group-level tooling directly on the Entra capabilities and Graph automation. Which of your entities qualify, which do not, and what covers the difference all get set out in writing during discovery.

Managing several tenants is the right answer where the entities genuinely have to stay separate, whether legally, operationally or under a contract. But where a group shares one management team and one workforce, and keeps separate tenants purely because a decade of acquisitions left them lying around, consolidating into a single tenant usually beats managing five of them indefinitely. One pool of licenses, one administrative team, collaboration that works natively, and no federation layer to keep alive. We deliver both engagements, so the recommendation follows your structure rather than whichever service we would rather sell.