Download and fill in the share change forms depending on the changes you're making. How to Change Shares on Companies House.Forms to update shares. From here you can make certain changes to your limited company, all of which sync up directly with the Companies House system. Fill in the CS01 form: This form allows you to confirm and, if needed, update your company's shareholder information. Directors are legally required to update shareholder information at Companies House when changes occur. Read our blog to find out more. Companies Act 2006 is up to date with all changes known to be in force on or before 04 January 2025.