It is not uncommon for a private limited company to change its legal status (or type). You must register by post when changing to a public company or changing to an unlimited company.
There are several types, or legal structures, of company registration. You can change the status of a private limited company to:
A public limited company (PLC). An example would be one that sells shares in the company on the stock market.
An unlimited company (Unltd). An examples would be one whose members would not be liable for any of its financial obligations.
Registering Status Changes by Post
You must send the details of any company formation changes by post.
Re-register as a Public Limited Company (PLC)
You will need to use 'Form RR01' for a private limited company to re-register as a public limited company (PLC). Download the application form, fill it in, and attach copies of:
A special resolution (or a written resolution)
The new articles of association for the company
A balance sheet (not more than seven months old)
An auditor's statement and an auditor's report
Note: Send all the documents to the address written on application form RR01 with a cheque for £20 (the same-day service costs £50).
Re-registration as an Unlimited Company (Unltd)
You must use 'Form RR05' to make an application as a private limited company for re-registration as an unlimited company. Download the application form, fill it in, and attach copies of:
A 'form of assent' (a statement that shows all members have agreed to the re-registration). You can use the form of assent template for the re-registration of a public company as private and unlimited.
A printed copy of the new articles of association for the company.
Note: Send all the documents to the address written on application form RR05 with a cheque for £20. You can also view a list of Companies House fees on the GOV.UK website.