What Is an IPO? A Beginner's Guide
IPO Intelligence · The CODEW Intelligence
A beginner's guide to Initial Public Offerings — what an IPO is, why companies go public, how the process works, who is involved, and what happens after the first trade.
An Initial Public Offering — IPO — is the moment a private company sells shares to the public for the first time and lists on a stock exchange.
It is more than a fundraising event. It is a fundamental change in how a company is owned, funded, regulated, and valued. For investors, it is the first time they can buy a piece of a company that was previously off-limits. For the company, it is the transition from a private enterprise to a public one.
What Is an IPO?
Definition: An Initial Public Offering (IPO) is the process by which a private company offers shares of its stock to the public for the first time, raising capital and becoming a publicly traded company listed on a stock exchange like the NYSE or Nasdaq.
Before an IPO — A company is private. It might have a handful of owners — founders, employees, and private investors like venture capital firms. You cannot buy its stock on the open market.
After an IPO — It is public. Anyone with a brokerage account can buy and sell its shares. It now has thousands or millions of shareholders and must report its financials to the public.
Simple example: Imagine a coffee chain called BrewCo. It started with two founders and $2 million from venture investors. It now has 100 stores and wants to expand to 500. It needs $300 million — more than any private investor wants to provide.
BrewCo hires an investment bank, files paperwork with regulators, and sells 15 million shares to the public at $20 per share. It raises $300 million. The next day, those shares begin trading on Nasdaq under the ticker BREW. BrewCo is now a public company.
That first sale of 15 million shares at $20 is the IPO.
Learn more in our core pillar: IPO Intelligence.
Why Do Companies Go Public?
Companies do not go public for the prestige. They go public because it solves specific strategic problems.
1. Raising capital — This is the primary reason. An IPO is one of the largest sources of capital a company will ever access. The money raised can be used to expand operations, build factories, hire, pay down debt, or fund research. Unlike a loan, this capital never has to be repaid.
2. Existing shareholder liquidity — Founders, early employees, and venture capital investors often own valuable shares on paper, but they cannot easily turn them into cash while the company is private. An IPO creates a public market where they can eventually sell some or all of their holdings.
3. Public visibility — An IPO puts a company on the map. Listing brings media coverage, brand credibility, and trust with customers and partners. It also helps with recruiting — being able to offer public stock is a powerful hiring tool.
4. Acquisition currency — Public companies can use their own stock as currency to buy other companies. Instead of paying all cash, they can offer the target company's shareholders shares of their public stock, which is often more attractive.
5. Other strategic considerations — Going public establishes a clear market valuation, which helps with everything from executive compensation to future fundraising. It also gives the company ongoing access to the capital markets — after the IPO, it can raise more money much more easily through follow-on offerings.
CODEW Lens: IPOs are not exits. They are the beginning of a different kind of operating life — one where every quarter is public, every decision is scrutinized, and every metric is compared to a forecast.
How an IPO Works
An IPO is not a single event but a months-long process. While every deal is different, the basic sequence is almost always the same:
Preparation → Underwriters → S-1 / Prospectus → SEC Review → Roadshow → Pricing → Allocation → First Trading Day
Preparation — Months before anything public happens, the company gets its house in order. It hires auditors to clean up financials, strengthens its board of directors, puts proper financial controls in place, and creates a corporate structure suitable for a public company.
Investment banks / Underwriters — The company selects one or more investment banks to lead the IPO. These banks are called underwriters. Their job is to advise on valuation, prepare documents, find buyers for the shares, and support the stock after it starts trading. The lead banks are called bookrunners.
S-1 / Prospectus — The company and its lawyers draft a massive disclosure document called the S-1 registration statement (in the U.S.). This becomes the prospectus that is given to investors. It includes the business model, risk factors, financial statements, how the company will use the money, and who owns what. For a breakdown, see: How to Read an IPO Prospectus.
SEC review — The S-1 is filed confidentially or publicly with the U.S. Securities and Exchange Commission (SEC). The SEC reviews it and sends back comments and questions. The company amends the filing until the SEC is satisfied. This can take 1–4 months.
Roadshow — Once the SEC is close to clearing the filing, the company goes on a roadshow. The CEO, CFO, and bankers travel (physically or virtually) to meet institutional investors — large mutual funds, hedge funds, pension funds. They pitch the story for 30–40 minutes and answer questions. The goal is to generate demand and get feedback on valuation.
Pricing — After the roadshow, the company and its bankers look at how much demand there is at different prices. They decide on a final IPO price — say, $20 per share. This is the price the first investors will pay.
Allocation — The bankers decide who gets to buy shares at the IPO price. This is called allocation. Because good IPOs are oversubscribed, not everyone who wants shares gets them. Institutions that placed large, informed orders during the roadshow typically get priority.
First trading day — The next morning, the stock opens for trading on its exchange. From this point on, the market — supply and demand — determines the price.
Track upcoming deals on our IPO Dashboard.
Who Is Involved?
An IPO is a team effort with many specialized players:
The Company — The management team, especially the CEO and CFO, who drive the process, tell the story, and make all major decisions.
Investment banks / Underwriters — They advise on timing and valuation, draft the prospectus, run the roadshow, build the book of investor orders, set the price, allocate shares, and provide aftermarket support.
Lawyers — Two sets — company counsel and underwriters' counsel. They manage the S-1 drafting, SEC compliance, and all legal documentation.
Auditors — An independent accounting firm (typically Big Four) audits the company's financials for inclusion in the S-1. Public company financials must be audited.
Regulators — The SEC in the U.S. reviews the filing to ensure investors have full and fair disclosure. The stock exchange (NYSE or Nasdaq) also has its own listing standards.
Institutional investors — Large investors like Fidelity, BlackRock, and T. Rowe Price. They are the primary buyers in most IPOs and provide price feedback during the roadshow.
Public investors — Retail investors who buy shares either at the IPO price (if they get allocation through their broker) or, more commonly, in the open market once trading begins.
Most retail investors do not get IPO allocations. They buy on the open market on day one or later.
How IPO Pricing Works
IPO pricing is where art meets math. There are three linked concepts:
Valuation — Before setting a price, the banks and investors try to determine what the whole company is worth. They use comparable public companies, financial models, growth rates, and demand from the roadshow. Let's say they agree BrewCo is worth around $1 billion.
Shares offered & Share price — Valuation is split into shares. If the company is worth $1 billion and wants to sell 15 million shares, the price would be roughly $66. But it can also split the company into more shares at a lower price. The math is: Valuation / Total Shares Outstanding = Price Per Share. Companies usually aim for an IPO price between $15 and $25 per share because that range appeals to a wide range of investors.
Primary vs. Secondary Shares — This distinction matters.
Primary shares are new shares created by the company. When they are sold, the money goes to the company. This is dilutive but raises capital.
Secondary shares are existing shares owned by founders or VCs. When they are sold, the money goes to those shareholders, not the company.
Most IPOs are mostly primary shares, with a small secondary component to provide some liquidity to early investors. A 100% secondary IPO means the company itself raises nothing.
Want to go deeper? See: IPO Valuation and IPO Dilution Explained.
What Happens on IPO Day?
IPO day is highly choreographed.
The company and its bankers have already sold the shares to institutional investors at the IPO price the night before. At, say, $20.
But at 9:30 a.m., when the exchange opens, the stock does not automatically start trading at $20. The exchange runs an opening auction. It collects buy and sell orders from everyone — the institutions who got IPO shares and want to sell, and new investors who want to buy. The exchange finds the price where supply and demand balance.
That becomes the opening price. It can be very different from the IPO price. If demand is strong, it might open at $35. If demand is weak, it might open at $18.
Why the difference? The IPO price is set the night before based on the bankers' best estimate. The opening price is set by the live market minutes later. The difference between the two — often called the IPO pop or drop — reflects how well the bankers judged demand.
From the opening price onward, the stock trades just like Apple or Microsoft — price moving second by second based on buyers and sellers.
What Happens to Existing Shareholders?
When a company goes public, its existing owners do not disappear. Their shares are still there, but the rules change.
Founders — Still own a large stake, but now that stake has a public market value. They are typically subject to a lock-up.
Employees — Early employees often hold stock options or RSUs. The IPO is often their first chance to see a real market value for that equity and, after the lock-up, sell it.
Venture capital investors — VC firms typically distribute public shares to their own investors (limited partners) after the IPO, completing their investment cycle.
Lock-up periods: To prevent the market from being flooded with shares on day one, insiders — founders, employees, VCs — agree to a lock-up, typically 90 to 180 days after the IPO. During this period, they cannot sell their shares. When the lock-up expires, a large number of shares can become eligible for sale, which sometimes puts pressure on the stock price.
Dilution: When a company issues new primary shares in the IPO, existing shareholders own a smaller percentage of a bigger pie. If you owned 2% of a company with 10 million shares, and the company issues 5 million new shares, you now own 2% of 15 million — which is 1.33% of the company. Your ownership percentage was diluted, but hopefully the value of your stake increased because the company now has $300 million in cash and a public market valuation.
The CODEW Lens: IPO dilution is not a loss. It is a trade — ownership percentage for liquid value, capital access, and a market-tested valuation.
IPO vs. Staying Private
Why not stay private forever? Many large companies do. The choice comes down to trade-offs:
Capital access
Private: Limited to VCs, private equity, banks. Rounds can be slow and dilutive.
Public: Access to massive public markets. Can raise billions overnight.
Disclosure
Private: Minimal. Financials stay confidential.
Public: High. Must file quarterly (10-Q) and annual (10-K) reports, disclose executive pay, and report material events.
Ownership
Private: Concentrated with founders and a few investors. Founders retain more control.
Public: Dispersed among thousands of shareholders. Subject to shareholder votes and activist pressure.
Liquidity
Private: Illiquid. Hard to sell shares quickly without a secondary transaction.
Public: Highly liquid. Shares can be sold instantly during market hours.
Regulation
Private: Relatively light.
Public: Heavy. Subject to SEC, Sarbanes-Oxley, exchange rules, short-seller scrutiny, and class-action litigation risk.
Staying private means more control and privacy, but less capital and liquidity. Going public means more capital and liquidity, but less control and privacy.
This is why alternatives have emerged. See: IPO vs Direct Listing and IPO vs SPAC.
Common IPO Terms — A Quick Glossary
S-1 — The registration statement a company files with the SEC to go public. Contains all business, financial, and risk disclosures. After the IPO, it becomes the prospectus.
Underwriter — The investment bank that manages the IPO process, helps price the deal, and buys the shares from the company to resell to investors.
Roadshow — A series of presentations by management to institutional investors to generate interest in the IPO.
IPO price — The price at which shares are sold to initial investors the night before trading begins. Set by the company and underwriters.
Market capitalization (Market Cap) — Total value of a company on the stock market. Calculated as Share Price × Total Shares Outstanding. If BrewCo has 50 million total shares outstanding and trades at $30, its market cap is $1.5 billion.
Lock-up — A 90–180-day period after the IPO during which insiders are prohibited from selling their shares.
Dilution — The reduction in ownership percentage of existing shareholders when new shares are issued.
Ticker symbol — The 1–5 letter abbreviation used to trade the stock, e.g., AAPL for Apple. Companies often spend significant time choosing it.
For a full tracker, see: IPO Dashboard.
What Happens After the IPO?
Going public is not the finish line. It is the starting line for life as a public company.
Quarterly reporting — The company must now file quarterly financials (10-Q), annual financials (10-K), and disclose any material events (8-K). Everything is public.
Investor relations — The company builds an IR team to communicate with shareholders, answer investor questions, and host earnings calls four times a year.
Analyst coverage — Investment banks' research analysts begin publishing research reports with Buy/Sell/Hold ratings and price targets, which influences how the market perceives the company.
Share-price volatility — The stock price will now fluctuate daily based on earnings results, news, market sentiment, and macroeconomic factors. Management must learn to manage the business for the long term while navigating short-term market reactions.
Continued capital-market access — As a public company, it can now raise additional capital via follow-on offerings, issue convertible bonds, or use its stock to acquire competitors — tools that were much harder to access when private.
The CODEW Lens: The first 90 days of trading are when a company learns what the public market thinks of its business. The valuation is no longer a negotiation with VCs. It is a daily verdict.
Understanding Every IPO That Follows
An IPO is a company's coming-of-age moment. A private startup with a few owners raises capital from the public, accepts the scrutiny of regulators and investors, and transforms into an entity whose value is set every second by the market.
The lifecycle is clear: preparation and cleanup, partnering with underwriters, disclosing everything in the S-1, answering to the SEC, convincing institutional investors on the roadshow, pricing and allocating shares, and finally, opening for trading.
For founders, it is liquidity and a currency for growth. For early investors, it is the payoff for years of risk. For public investors, it is the first chance to own a piece of the next big company. And for the company itself, it is a permanent shift — from building in private to performing in public.
Understanding that shift is the key to understanding every IPO that follows.
The CODEW Stat
1–4 months · 30–40 minutes · 90–180 days The SEC review process can take 1–4 months. A roadshow pitch runs 30–40 minutes per institutional meeting. And lock-up periods typically last 90–180 days. An IPO is a months-long process compressed into a single public moment.
