This Practice Note explores the fundamental aspects of company law relating to the constitution of a company (whether comprising any or all of the memorandum, articles of association or any other resolutions or agreements). It includes content relating to entrenchment, amendment of the articles and the bespoke articles relevant for joint ventures, buyouts and venture capital transactions. What is a company’s constitution? A company’s 'constitution' is defined under section 17 of the Companies Act 2006 (CA 2006) as including: • the company’s articles of association, and • any resolutions and agreements affecting a company’s constitution (see What are ‘resolutions and agreements’ affecting a company’s constitution? below) The CA 2006 definition of 'constitution' is not exhaustive and also refers to other documents forming part of the constitution of a company, including (see CA 2006, ss 29–32): • the certificate of incorporation and any certificates of incorporation on change of name • a current statement of capital (or statement of guarantee for a company limited by guarantee), and • any court orders or enactments altering the company’s constitution or sanctioning a compromise,