Your brokerage firm may also sell the IPO only to selected clients. For example, before you can purchase an IPO, some firms require that you have a minimum cash balance in your account, are an active trader with the firm, or subscribe to one of their more expensive or "premium" services. In addition, some firms impose restrictions on investors who "flip" or sell their IPO shares soon after the first day of trading to make a quick profit. If you flip your IPO shares, your firm may refuse to sell you other IPOs altogether or prevent you from buying an IPO for several months. You can often find these cash requirements and eligibility policies on the firm's website.

Risky Business:
"Pre-IPO" Investing

"Pre-IPO" investing involves buying a stake in a company before the company makes its initial public offering of securities. Many companies and stock promoters entice investors by promising an opportunity to make high returns by investing in a start-up enterprise at the ground floor level — often a new company that claims to be related to the Internet or e-commerce.