Accounts are owned by the organization detailed during signup, if it is a legal entity. If the organization is unincorporated, the account is owned by the individual who signed up for the account.
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When you sign up and create an account for any Arthur Maxwell, Inc product, like ExperienceBuilder, the person who originally signed up for the account is default designated the account's primary contact and associated with the payment information, but the role can be reassigned. Again, unless the organization is not a legal entity, the account and data held in it, is ultimately owned by the organization.
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For information about how to change the primary contact on the account, and their privileges, please review the help guide.