The chain of command is also known as the

The chain of command is also known as the vertical hierarchy.
The vertical hierarchy is a hierarchical organization structure in which management or supervisor surpass information and commands from the top of the organizational pyramid down toward the bottom. It is also called the top-down management. 

Common stock is a form of corporate equity ownership, a type of security. The terms voting share and ordinary share are also used frequently outside of the United States. They are known as equity shares or ordinary shares in the UK and other Commonwealth realms.