Types of preference shares : 

Callable : The issuing company has the right to buy back these shares at a certain price on a certain date. Since the call option tends to cap the maximum price to which a preference share can appreciate (before the company buys it back), it tends to restrict stock price appreciation. Convertible : The owner of these preference shares has the option, but not the obligation, to convert the shares to a company’s common stock at some conversion ratio. This is a valuable feature w hen the market price of the common stock increases substantially, since the owners of preference shares can realize substantial gains by converting their shares.

Cumulative : If a company does not have the financial resources to pay a dividend to the owners of its preference shares, then it still has the payment liability’ and cannot pay dividends to its common shareholders for as long as that liability’ remains unpaid.

Non-cumulative : If a company does not pay a scheduled dividend, it does not have the obligation to pay the dividend at a later date. This clause is rarely used.