A public limited company (plc) is a company which is allowed to sell its shares to the public and can obtain a listing on the stock exchange. Investors, known as shareholders, can buy these shares, either when the company first issues them or when an existing shareholder offers some for sale.
All plcs have a chief executive and a Board of Directors who run the company. Directors are appointed by shareholders. Directors have to retire after a length of time but may stand for re-election at the Annual General Meeting, when shareholders have the opportunity to vote for or against them.