Once a limited (Ltd) company has grown in size and needs further investment, which it cannot get from its current pool of owners, it may consider becoming a PLC. If it intends to float shares on the stock market, so they can be bought by anyone, it will need to first issue a prospectus where potential investors are invited to purchase share before flotation (called an IPO). Going public is expensive - lawyers to draw up legal paperwork, publications, advertising and admin. Company must have £50,000 in share capital.