A limited company is a company in which the liability of members or subscribers of the company is limited to what they have invested or guaranteed to the company. Limited companies may be limited by shares or by guarantee. The former may be further divided into public companies and private companies. Who may become a member of a private limited company is restricted by law and by the company’s rules. In contrast, anyone may buy shares in a public limited company. Limited companies can be found in most countries, although the detailed rules governing them vary widely. It is also common for a distinction to be made between the publicly tradable companies of the plc type (for example, the German Aktiengesellschaft (AG), Czech a.s. and the Spanish, French, Polish and Romanian S.A.), and the “private” types of company (such as the German GmbH, Polish sp. z o.o., the Czech s.r.o. and Slovak s.r.o.)