If your company has a Constitution or the replaceable rules: One or more of the directors may be managing director. If more than one managing director is appointed, they hold office jointly. A person may only be managing director as long as they are and remain a director – if they resign as a director, they automatically cease to hold office as managing director. If your company has a Constitution that is not a Constitution:You will need to review the terms of the Constitution to check who can act as managing director. If you are unsure, you should obtain legal advice