In order to transfer the ownership of an organization to a different user, you must first make sure that that user is a collaborator for the organization in question. You can read more about that process here: How do I create and manage organizations?
Once the desired new owner is a collaborator on the organization, the current owner must email success@hologram.io from the email associated to the organization on the Hologram platform following the template below:
Subject: Account Transfer
Body:
Please permanently transfer Organization {ORGID} to user {recipients_email}.
I acknowledge that I will no longer be the owner of that organization or
the SIMs that are in it.