A note outlining the law relating to a company's register of members under the Companies Act 2006. The note considers the obligation to maintain the register of members, the content of the register, the "proper purpose" test for a request to inspect or obtain copies of the register and the company's response to such a request, Companies House filing requirements in relation to the location of the register, data protection issues, and the option for private companies to use a public central register of members.