Closing your Company means the Company records and everything associated with it will be deleted: role, applications, jobs, fleet, economy, garages will be deleted, members will be deassociated from your Company. THIS ACTION IS IRREVERSIBLE!
You can close and delete your profile at any time, all your personal data will be deleted, any personal info deassociated from your account, including email address and Steam account, all jobs will be deleted. THIS ACTION IS IRREVERSIBLE!