This Practice Note looks at the provisions of the UK Corporate Governance Code (UKCG Code) on the governance role of the board of companies with a listing of equity shares in the equity shares (commercial companies) category and the distinct roles and responsibilities of the chair, senior independent director (SID) and non-executive directors (NEDs). It also considers the UKCG Code requirements on board composition, including the concept of independence under the UKCG Code. The non-executive director (NED) is not a statutory requirement or creation, but it is a key role to ensure good corporate governance. There is no legal distinction in the Companies Act 2006 (CA 2006) between executive and non-executive directors. NEDs have the same duties, responsibilities and potential liabilities under law as executive directors. For information on these legal duties and liabilities, and the standards to which all directors are equally subject, see: Powers, duties and liabilities of directors—overview. Non-executive directors of listed companies do, however, have distinct roles and responsibilities in the corporate governance arena.