* Common stock : Common stock, also referred to as ordinary shares, the most commonly held form of stock in a company. Shareholders of common stock have voting rights in company decision matters. It is the residual corporate interest that bears the finally risks of loss and receives the benefits of success.

* Treasury stock : Treasury stock is that shares which can been bought back from the public. Treasury Stock is considered issued, but not outstanding.

* Preferred stock : Preferred stock, sometimes called preference shares, have priority over common stock in the distribution of dividends and assets. Most preference shares provide no voting rights in company decision matters.

* Dual class stock : Dual class stock is shares issued for a single company with varying classes indicating different rights on voting and dividend payments. Each type of shares has its own class of shareholders entitling different rights.