Thank you for your inquiry. Computershare account holder IDs or holder numbers are primarily used for international investors during registration. If you are an international investor, please reach out to us at firstname.lastname@example.org . Additionally, please reach out to us if you are a domestic investor who has reached out to Computershare via phone and are asked to provide your account holder ID or holder number. Please note that an investor who registers using their Computershare holder ID or holder number will have certain restrictions to modify information on their account. To gain full administrative privileges, it is critical to register your account using SSN/TIN/EIN information.