S.p.A.

A joint stock company (JSC) is a type of business partnership  in which the capital is formed by the individual contributions of a group of shareholders. Certificates of ownership or stocks are issued by the company in return for each contribution, and the shareholders are free to transfer their ownership interest at any time by selling their stockholding to others.
See more at Wikipedia.org...

limited company, company whose stockholders are liable only for the sum they invested