Initial public offering (IPO), also referred to simply as a "public offering", is when a company issues common stock or shares to the public for the first time. They are often issued by smaller, younger companies seeking capital to expand, but can also be done by large privately-owned companies looking to become publicly traded.

In an IPO, the issuer may obtain the assistance of an underwriting firm, which helps it determine what type of security to issue (common or preferred), best offering price and time to bring it to market.

IPOs can be a risky investment. For the individual investor, it is tough to predict what the stock or shares will do on its initial day of trading and in the near future since there is often little historical data with which to analyze the company. Also, most IPOs are of companies going through a transitory growth period, and they are therefore subject to additional uncertainty regarding their future value.

Reasons for listing

When a company lists its shares on a public exchange, it will almost invariably look to issue additional new shares in order to raise extra capital at the same time. The money paid by investors for the newly-issued shares goes directly to the company (in contrast to a later trade of shares on the exchange, where the money passes between investors). An IPO, therefore, allows a company to tap a wide pool of stock market investors to provide it with large volumes of capital for future growth. The company is never required to repay the capital, but instead the new shareholders have a right to future profits distributed by the company and the right to a capital distribution in case of a dissolution.

The existing shareholders will see their shareholdings diluted as a proportion of the company's shares. However, they hope that the capital investment will make their shareholdings more valuable in absolute terms.

In addition, once a company is listed, it will be able to issue further shares via a rights issue, thereby again providing itself with capital for expansion without incurring any debt. This regular ability to raise large amounts of capital from the general market, rather than having to seek and negotiate with individual investors, is a key incentive for many companies seeking to list.

Procedure

IPOs generally involve one or more investment banks as "underwriters." The company offering its shares, called the "issuer," enters a contract with a lead underwriter to sell its shares to the public. The underwriter then approaches investors with offers to sell these shares.

The sale (that is, the allocation and pricing) of shares in an IPO may take several forms. Common methods include:

• Dutch auction
• Firm commitment
• Best efforts
• Bought deal
• Self Distribution of Stock

A large IPO is usually underwritten by a "syndicate" of investment banks led by one or more major investment banks (lead underwriter). Upon selling the shares, the underwriters keep a commission based on a percentage of the value of the shares sold. Usually, the lead underwriters, i.e. the underwriters selling the largest proportions of the IPO, take the highest commissions—up to 8% in some cases.