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Preferred shares are more common in private or pre-public companies, where it is more useful to distinguish between the control of and the economic interest in the company. Government regulations and the rules of stock exchanges may discourage or encourage the issuance of publicly traded preferred shares. In many countries banks are encouraged to issue preferred stock as a source of Tier 1 capital. On the other hand, the Tel Aviv Stock Exchange prohibits listed companies from having more than one class of capital stock.

A single company may issue several classes of preferred stock. For example, a company may undergo several rounds of financing, with each round receiving separate rights and having a separate class of preferred stock; such a company might have "Series A Preferred", "Series B Preferred", "Series C Preferred" and common stock.

In the United States there are two types of preferred stocks: straight preferreds and convertible preferreds. Straight preferreds are issued in perpetuity (although some are subject to call by the issuer under certain conditions) and pay the stipulated rate of interest to the holder. Convertible preferreds--in addition to the foregoing features of a straight preferred--contain a provision by which the holder may convert the preferred into the common stock of the company (or, sometimes, into the common stock of an affiliated company) under certain conditions, among which may be the specification of a future date when conversion may begin, a certain number of common shares per preferred share, or a certain price per share for the common.

There are income tax advantages generally available to corporations that invest in preferred stocks in the United States that are not available to individuals.

Some argue that a straight preferred stock, being a hybrid between a bond and a stock, bears the disadvantages of each of those types of securities without enjoying the advantages of either. Like a bond, a straight preferred does not participate in any future earnings and dividend growth of the company and any resulting growth of the price of the common. But the bond has greater security than the preferred and has a maturity date at which the principal is to be repaid. Like the common, the preferred has less security protection than the bond. But the potential of increases of market price of the common and its dividends paid from future growth of the company is lacking for the preferred. One big advantage that the preferred provides its issuer is that the preferred gets better equity credit at rating agencies than straight debt, since it is usually perpetual. Also, as pointed out above, certain types of preferred stock qualifies as Tier 1 capital. This allows financial institutions to satisfy regulatory requirements without diluting common shareholders. Said another way, through preferred stock, financial institutions are able to put on leverage while getting Tier 1 equity credit.

Suppose that an investor paid par ($100) today for a typical straight preferred. Such an investment would give a current yield of just over 6%. Now suppose that in a few years 10-year Treasuries were to yield 13+% to maturity, as they did in 1981; these preferreds would yield at least 13%, which would knock their market price down to $46, for a 54% loss. (In all probability, they would yield some 2% more than the Treasuries--or something like 15%, which would take the market price down to $40, for a 60% loss.)

The important difference between straight preferreds and Treasuries (or any investment-grade Federal agency or corporate bond) is that the bonds would move up to par as their maturity date is approached, whereas the straight preferred, having no maturity date, might remain at these $40 levels (or lower) for a very long time.

Advantages of straight preferreds posited by some advisers include higher yields and tax advantages (currently yield some 2% more than 10-year Treasuries, rank ahead of common stock in the case of bankruptcy, dividends are taxable at a maximum 15% rather than at ordinary income rates, as in the case of bond interest).