What Is an IPO (Initial Public Offering)?

Last updated 05/07/2026 by

Ante Mazalin

Edited by

Andrew Latham

Fact checked by

Andy Lee

Summary:

An initial public offering (IPO) is the process by which a private company first sells shares of its stock to the public on a stock exchange, raising capital and allowing outside investors to buy an ownership stake.

It is one of the most significant events in a company’s lifecycle.

For companies: An IPO raises capital for growth, pays off early investors, and raises the company’s public profile.
For investors: IPOs offer early entry into a company’s public trading history, but come with higher uncertainty than established public companies.
For the market: IPO activity is a widely watched indicator of investor sentiment and market conditions.

IPOs capture public attention because they mark the moment a private success story becomes accessible to ordinary investors. But the excitement surrounding a debut does not guarantee returns.

Understanding how the process works helps you evaluate whether participating makes sense for your portfolio.

What Is an IPO?

Before an IPO, a company is privately held: ownership is limited to founders, employees, and private investors such as venture capital and private equity firms. Going public transfers some of that ownership to the broader investing public through shares traded on an exchange like the NYSE or Nasdaq.

The company works with investment banks (called underwriters) to determine the offering price, register the shares with the SEC, and market the IPO to institutional investors. According to the U.S. Securities and Exchange Commission, retail investors should review the company’s prospectus (S-1 filing) carefully before participating in an IPO.

How the IPO Process Works

Taking a company public is a structured, multi-month process that involves regulators, investment banks, and institutional investors before the general public can buy shares.

Stage	What Happens
Selection of underwriters	The company hires investment banks to manage the offering, set pricing, and distribute shares
SEC registration	The company files an S-1 prospectus with the SEC disclosing financials, risks, and business details
Roadshow	Company executives present to institutional investors to gauge demand and refine pricing
Pricing	The final IPO price is set the night before trading begins, based on investor demand during the roadshow
First day of trading	Shares begin trading on the exchange; price may open significantly above or below the IPO price
Lock-up expiration	Typically 90 to 180 days after IPO, insiders can sell shares, sometimes creating downward pressure

IPO Pricing and the First-Day Pop

Underwriters set the IPO price in consultation with institutional investors during the roadshow. Retail investors typically cannot buy at the IPO price; they buy at the opening market price, which is often higher.

A “first-day pop,” where shares surge well above the IPO price on day one, benefits institutional investors who received shares at the offering price. By the time retail investors can participate, much of that initial gain has already occurred. Some IPOs also open below their offering price if demand falls short of expectations.

Pro Tip

The 90-to-180-day lock-up period, during which insiders are barred from selling shares, deserves attention before you invest. When the lock-up expires, a large volume of insider shares may hit the market simultaneously, creating selling pressure that can push the price down. Watch the lock-up expiration date for any IPO you own or are considering buying post-debut.

Alternatives to the Traditional IPO

Not every company goes public through a traditional IPO. Two alternatives have grown in prominence in recent years.

Direct listing: The company lists existing shares on an exchange without issuing new shares or hiring underwriters. No capital is raised; early investors and employees can sell directly. Spotify and Coinbase used this approach.
SPAC (Special Purpose Acquisition Company): A blank-check company raises money through its own IPO, then merges with a private company to take it public. Faster and less regulated than a traditional IPO, but has produced mixed results for retail investors.

Risks of Investing in IPOs

IPOs carry risks that established public companies do not.

Limited financial history: Many IPO companies are unprofitable at the time of listing, making traditional valuation methods difficult to apply.
Information asymmetry: Insiders and institutional investors know far more about the business than retail buyers at IPO time.
Lock-up expiration selling: A wave of insider selling after the lock-up expires can depress the stock price months after the debut.
Post-IPO volatility: Newly public stocks often experience wide price swings in the first year as the market establishes a fair value.
Hype risk: Heavily marketed IPOs sometimes price in growth expectations that the company never achieves, resulting in long-term underperformance even after a strong debut.

Good to know: The SEC requires every IPO company to file an S-1 registration statement that is publicly available on EDGAR (sec.gov/edgar). The S-1 contains the company’s financial statements, risk factors, business description, and details on how IPO proceeds will be used. Reading the risk factors section alone often reveals material concerns that media coverage omits.

How Retail Investors Can Access IPOs

Retail investors historically had limited access to IPO shares at the offering price. Allocations were reserved for institutional clients of the underwriting banks.

Several brokerages now offer IPO access to retail clients, including Fidelity, Schwab, and TD Ameritrade for qualifying accounts. Platforms like Robinhood have also offered IPO access through the underwriter. Demand for hot IPOs still heavily favors institutional buyers, and retail allocations are typically small.

For most retail investors, waiting 30 to 90 days after the IPO and allowing initial volatility to settle before buying has historically produced better risk-adjusted outcomes than buying at the opening print.

Compare investment platforms on SuperMoney to find brokerages that offer IPO access and match your broader investment needs.

Frequently Asked Questions

What does IPO stand for?

IPO stands for initial public offering. It is the first time a private company sells shares of its stock to the general public on a regulated stock exchange, transitioning from private to publicly traded ownership.

Can anyone invest in an IPO?

Technically yes, but practical access varies. Shares at the IPO price are typically allocated to institutional investors and high-net-worth clients of the underwriting banks. Retail investors can buy shares when trading opens on the exchange, but that is often at a higher price than the IPO price. Some brokerages offer retail clients limited IPO access for qualifying accounts.

Why do companies go public?

Companies go public primarily to raise capital for growth, pay off early investors and employees holding stock options, increase their public profile, and gain a currency (public shares) for acquisitions. Going public also imposes reporting requirements and scrutiny that some companies prefer to avoid, which is why many large private companies stay private longer than they once did.

What is an IPO lock-up period?

A lock-up period is a contractual restriction, typically 90 to 180 days after the IPO, during which company insiders (founders, employees, and early investors) cannot sell their shares. The lock-up prevents a flood of insider selling immediately after the IPO. When it expires, insiders may sell, which can push the stock price down if supply significantly exceeds demand.

Is buying IPO stock a good investment?

Research consistently shows that IPOs underperform the broader market on average over the first three to five years after listing, largely because of overvaluation at debut and insider selling after lock-up expiration.

Individual IPOs vary widely: some become exceptional long-term investments, many do not. Evaluating the company’s fundamentals through its S-1 filing rather than relying on media hype gives you the best basis for a decision.

Key takeaways

An IPO is the first sale of a private company’s shares to the public, allowing it to raise capital and giving investors an ownership stake.
Underwriters set the IPO price; retail investors typically buy at the opening market price, which is often higher.
Lock-up expiration 90 to 180 days post-IPO can create selling pressure as insiders are permitted to sell for the first time.
Direct listings and SPACs are alternatives to the traditional IPO process, each with different implications for retail investors.
On average, IPOs underperform the broader market over the first three to five years; reviewing the S-1 filing is essential before investing.

Before investing in IPOs or any publicly traded securities, compare investment platforms on SuperMoney to find a brokerage with the features, fees, and IPO access that fit your strategy.

Notable IPOs by year

Companies that IPO’d in 2019: Uber, Pinterest, Zoom, Beyond Meat, and Slack all went public in one of the most active IPO years of the decade.
Companies that IPO’d in 2012: Facebook’s $16 billion debut headlined a class that also included Yelp, Workday, and Palo Alto Networks.
Companies that IPO’d in 2013: Twitter, Hilton Worldwide, and Zoetis were among 251 companies that went public that year.
Companies that IPO’d in 2010: Tesla and GM both debuted in 2010, marking a recovery in IPO activity after the financial crisis.

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