An IPO (Initial Public Offering) is the process by which a private company starts trading on the stock market, selling shares to the public for the first time. It is the moment of maximum media attention for a company — and, statistically, one of the worst times to buy it.
The company hires investment banks that value the business, prepare the prospectus and "place" the shares with institutional investors. The offer price balances two opposing interests: the company wants to raise as much as possible; the banks want the first day to pop. Retail investors usually arrive afterwards, buying on the open market from whoever got in earlier and cheaper.
Two details of the process matter especially:
Academic research (Jay Ritter has measured it for decades) is consistent: on average, IPOs underperform the market in their first years of trading. Spectacular first-day pops exist — they are the ones in the headlines — but the investor who buys at the debut and holds tends to lag the index. There are exceptions; as a rule, buying at the IPO means paying the price of euphoria.
Companies going public are usually young and reinvest everything in growth: very few pay a dividend at debut, and those that promise one often take years to consolidate it. For an income strategy, an IPO is almost always irrelevant today and perhaps interesting a decade later, when the business matures and starts distributing — the case of Aena, listed in 2015 and now one of Spain's big payers. A dividend aristocrat needs 25 years of history: no IPO can offer that, by definition.
On average, no: IPOs tend to lag the market in their first years. If you genuinely like the company, better prices usually appear months later — for instance after the lock-up expires.
Rarely: they are usually expanding businesses that reinvest all profits. The ones that become good payers do so years after maturing on the market.
The period (typically 90–180 days) during which founders and early investors cannot sell their shares. Its expiry increases the supply of stock and tends to pressure the price down.