普通股是股票的一种，相对于优先股。为一间公司最基本的一种股份类别。于上市公司中，一般会以这类股票在证券交易所上市，并通常占了公司资本的主要部分。普通股可分为「A股」和「B股」。

普通股持有人拥有的权益：

Common stock is a form of corporate equity ownership, a type of security. The terms "voting share" or "ordinary share" are also used frequently in other parts of the world; "common stock" being primarily used in the United States.

It is called "common" to distinguish it from preferred stock. If both types of stock exist, common stockholders cannot be paid dividends until all preferred stock dividends are paid in full.