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IPOs Explained: How Companies Go Public

2–3 minutes
IPOs Explained: How Companies Go Public

An initial public offering (IPO) is the process by which a private company sells shares to the public for the first time, becoming a publicly traded company. This guide covers the basics and the risks specific to newly listed stocks.

The IPO process, simplified

  1. The company hires investment banks (underwriters) to manage the offering
  2. The company files a prospectus (in the US, an S-1) disclosing financials and risks
  3. Underwriters set an initial price range and gauge investor demand
  4. Shares are priced and allocated to institutional investors before the stock opens to public trading

Why IPO stocks are often volatile

Summary diagram: Why IPO stocks are often volatile
Summary diagram: Why IPO stocks are often volatile

Newly listed stocks often lack a long trading history, meaning less data for valuation, more speculative interest and thinner initial trading volume, any of which can produce sharp price swings in the days and weeks after listing.

The lock-up period

Company insiders and early investors are typically restricted from selling shares for a set period after the IPO, often 90 to 180 days, known as the lock-up period. When it expires, a wave of new selling can pressure the stock, which is worth watching if you hold a recent IPO.

What to check before buying an IPO

  • Whether the company is actually profitable, or how far away profitability is
  • The lock-up expiration date and how much insider ownership it covers
  • How the valuation compares to already-public competitors in the same industry

Key takeaways

  • An IPO is the process of a private company selling shares to the public for the first time.
  • Newly listed stocks often carry higher volatility due to limited trading history.
  • The lock-up period expiration can trigger a new wave of selling pressure.

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