Direct answer
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For a new purchase, HubSpot's current catalog lists Content Hub Enterprise. Its additions over Professional include support for several root domains, content approvals, team limits on who can edit pages, serverless functions, custom objects and a higher membership limit. The catalog lists it from $1,500 a month, billed annually, with five core seats. A company that needs one of those capabilities has a reason to evaluate it, and company size alone doesn't settle the question.