You can register multiple companies in one go. Prepare a password protected Excel spreadsheet with a minimum of 15 company numbers and associated authentication codes. Submit the spreadsheet by email to BulkERems@companieshouse.gov.uk
In a separate email from the same address, confirm the spreadsheet password and single email address where the reminders are to be sent.
Only one email address can be assigned when joining in bulk registration. You can change an email address, or add additional email addresses (maximum of 4 per company) using the Companies House online filing service.