IPO: How Initial Public Offerings Work

An IPO — initial public offering — is the moment a private company first sells shares to the public on a stock exchange. It’s the gateway between private equity and venture capital and the public markets that millions of investors access every day. IPOs generate enormous media attention, often accompanied by dramatic first-day price pops that make headlines. But beneath the excitement lies a more nuanced reality: IPOs are systematically underpriced to benefit institutional investors, and their long-run returns have historically trailed the broader market. Understanding how the IPO process works — and who it’s designed to serve — is essential for any investor evaluating newly listed stocks.

What Is an IPO?

An initial public offering is the first time a company offers its shares for sale to the general public on a stock exchange. The process transforms a privately held company — owned by founders, employees, and early investors — into a publicly traded one whose shares can be bought and sold by anyone with a brokerage account.

The IPO process is managed by investment bank underwriters who advise the company on pricing, market the offering to institutional investors, and bear the risk of distributing the shares. In a firm commitment underwriting — the most common arrangement — the underwriters purchase all shares from the company at a negotiated price and resell them to investors, taking on the risk that they may not be able to sell at the planned offering price. In a best efforts arrangement, the underwriters simply agree to sell as many shares as possible without guaranteeing the full amount.

Before going public, the company must file a registration statement (the S-1 prospectus) with the Securities and Exchange Commission (SEC). This document discloses the company’s financials, business model, risk factors, use of proceeds, and management team — providing the information investors need to evaluate the offering.

Why Companies Go Public

Companies pursue IPOs for several strategic reasons, each carrying significant trade-offs.

Raise growth capital. An IPO can raise billions of dollars to fund expansion, research, acquisitions, or debt repayment. For high-growth companies that have exhausted private funding rounds, the public markets offer access to a much larger pool of capital.

Provide liquidity for early investors. Founders, venture capital firms, and private equity sponsors often hold stakes that are worth hundreds of millions on paper but cannot be easily sold. An IPO creates a liquid market where these early investors can gradually convert their holdings into cash.

Establish a market valuation. A public listing provides a transparent, market-determined valuation that the company can use as currency for stock-for-stock acquisitions, and as a benchmark for employee compensation through stock options and restricted stock units (RSUs).

Increase credibility and visibility. Public companies benefit from greater media coverage, analyst attention, and brand recognition, which can help attract customers, partners, and talent.

The trade-offs are significant. Public companies face quarterly reporting requirements, SEC compliance costs, short-term market pressure on earnings, loss of financial privacy, and the risk that activist investors or hostile acquirers may target the company. These burdens have driven some companies to stay private longer — or to explore alternatives to the traditional IPO.

The IPO Process

The IPO process typically takes 4-6 months from start to finish. Here are the seven key steps, illustrated with a hypothetical example: CloudSync, a cloud software company with $500 million in annual revenue and 30% year-over-year growth.

Step 1: Select Underwriters

CloudSync selects Goldman Sachs and Morgan Stanley as joint lead bookrunners — the investment banks that will manage the offering. These banks form an underwriting syndicate of additional banks to help distribute shares. The lead bookrunners advise on timing, pricing strategy, and deal structure.

Step 2: SEC Registration (S-1 Filing)

CloudSync files its S-1 prospectus with the SEC. This document contains audited financial statements, a description of the business and competitive landscape, risk factors, intended use of proceeds, and details about management and insider ownership. The SEC reviews and comments on the filing before clearing it for the roadshow.

Step 3: Roadshow

CloudSync’s CEO and CFO spend 1-2 weeks presenting to institutional investors — mutual funds, pension funds, hedge funds, and sovereign wealth funds — across major financial centers. The roadshow serves two purposes: generating interest in the offering and gathering feedback on what investors think the company is worth.

Step 4: Book Building

During the roadshow, institutional investors submit indications of interest — how many shares they want and at what price. These indications form the “book.” Based on demand, the underwriters set an initial price range (CloudSync’s range: $28-$32 per share) and revise it as needed.

Step 5: Pricing

The night before the stock begins trading, the underwriters set the final offer price based on the book. Strong demand pushes CloudSync to the top of its range: $32 per share. The underwriters also have a greenshoe (overallotment) option — the right to sell up to 15% additional shares beyond the original offering if demand is strong. The greenshoe also helps stabilize early trading: if the stock price drops below the offer price, underwriters can buy back shares without the greenshoe overhang.

Step 6: Allocation

Shares are allocated primarily to institutional investors who participated in bookbuilding. In CloudSync’s case, 62.5 million shares are offered: 50 million primary shares (newly issued by CloudSync, raising $1.6 billion for the company) and 12.5 million secondary shares (sold by early investors, with $400 million going to those selling shareholders). Retail investors typically receive limited allocations.

Step 7: First Day of Trading

CloudSync’s stock begins trading on the Nasdaq. Price discovery happens in the open market as supply meets demand for the first time beyond the book. We’ll explore what happens to CloudSync’s stock price — and why — in the next two sections.

IPO Pricing and the Underpricing Puzzle

One of the most studied phenomena in finance is IPO underpricing — the systematic tendency for IPO stocks to trade significantly above their offer price on the first day. According to Professor Jay Ritter’s comprehensive dataset, U.S. IPOs between 1980 and 2024 produced an average first-day return of approximately 19%. This is not a quirk of a few outlier deals — it is a persistent, global pattern.

Why does underpricing happen? Several forces are at work:

• Winner’s curse. Uninformed investors tend to receive full allocations primarily on weaker IPOs (because informed investors avoid those deals), while oversubscribed strong IPOs allocate few shares to uninformed participants. To keep uninformed investors participating in the market, IPOs must be underpriced on average.
• Information revelation. Underwriters need institutional investors to truthfully reveal their demand during bookbuilding. To incentivize honest participation, shares must be offered at a discount — investors who express strong interest are rewarded with allocations at below-market prices.
• Underwriter reputation. Investment banks prefer to underprice rather than risk a failed or poorly performing offering that could damage their franchise. A modest first-day pop signals a “successful” IPO, which attracts future clients.

Coursera’s 2021 IPO illustrates a typical outcome: the company offered shares at $33 and they opened trading at $39 — an 18% first-day pop. While Coursera raised capital successfully, it left significant money on the table. Had it sold shares at the $39 that investors were clearly willing to pay, the IPO would have raised 18% more.

Not every IPO is underpriced. Facebook’s 2012 IPO was priced aggressively at $38, and within a week the stock had dropped 15% below the offer price. Five months later, shares were trading at roughly half the offer price — though investors who held on were eventually rewarded as the stock recovered and grew dramatically.

IPO Example

Lock-Up Periods and Post-IPO Supply

After an IPO, a lock-up period — typically 90 to 180 days — prevents company insiders from selling their shares. Founders, employees, venture capitalists, and private equity sponsors who owned shares before the IPO must wait until the lock-up expires before they can sell on the open market.

Lock-up periods exist because a flood of insider selling immediately after an IPO would overwhelm the limited supply of publicly traded shares and likely crash the stock price. By restricting supply, lock-ups help maintain price stability during the critical early trading period.

The Lock-Up Expiration Effect

When the lock-up expires, the impact can be dramatic. Consider CloudSync’s numbers:

Some companies use staggered lock-up expirations, releasing insiders to sell in tranches over several months to reduce the supply shock. Investors should always check the lock-up expiration date before buying shares in a recent IPO — the date is disclosed in the S-1 prospectus.

SPACs vs Traditional IPOs vs Direct Listings

The traditional IPO is the most common path to going public, but it’s not the only one. Two alternatives — direct listings and SPACs — have gained prominence, each with distinct trade-offs.

When does each path make sense? Traditional IPOs suit companies that need to raise substantial new capital and want underwriter support for pricing and distribution. Direct listings work best for well-known companies that don’t need to raise cash immediately but want to provide liquidity for existing shareholders — brand recognition substitutes for a roadshow. SPACs were popular for companies seeking a faster path to public markets, though 2024 SEC rules have since aligned de-SPAC disclosure and liability standards with traditional IPOs. The SPAC boom of 2021 was followed by widespread investor losses, increased regulatory scrutiny, and a sharp decline in SPAC activity.

Dual-Class Share Structures

Some companies go public with dual-class share structures that give founders and insiders disproportionate voting power relative to their economic ownership. This allows founders to retain strategic control of the company even after selling a majority of the economic interest to public shareholders.

The typical structure creates two classes of stock: founders hold super-voting shares (often 10 votes per share), while public investors receive shares with 1 vote — or in extreme cases, no votes at all.

The controversy: Dual-class structures allow founders to pursue long-term strategies without short-term market pressure, but they also mean public shareholders have limited ability to influence corporate governance, executive compensation, or major strategic decisions. If the founder makes poor decisions, public shareholders have no mechanism to force change through voting.

Index implications: S&P Dow Jones Indices initially barred new dual-class companies from its indexes in 2017, but reversed course in 2023 and now considers multi-class stocks eligible subject to certain criteria. FTSE Russell requires that at least 5% of voting rights be held by public shareholders. These evolving standards reflect the ongoing debate about whether dual-class structures harm or protect shareholder value.

Long-Run IPO Performance

While IPO first-day returns are attractive on average (~19%), the long-run story is very different. Professor Jay Ritter’s research on U.S. IPOs from 1980 to 2024 shows that investors who buy IPO stocks at the first-day closing price and hold for three years underperform the broad stock market by approximately 20.5% and underperform style-matched portfolios (companies of similar size and valuation characteristics) by 8.9%.

Why do IPOs underperform over 3-5 years?

• Market timing. Companies and their bankers choose to go public when market sentiment is favorable and valuations are high — meaning investors may be overpaying for growth expectations that don’t materialize.
• Investor overoptimism. IPOs generate media excitement that can inflate early trading prices beyond fundamental value.
• Window dressing. Companies may time their IPO to coincide with peak financial performance, presenting financials that look better than the company’s sustainable trajectory.

Important caveat: Not all IPOs underperform. High-quality companies with strong fundamentals and reasonable valuations can deliver excellent long-term returns. The underperformance is an average across all IPOs — including many speculative companies that had no business going public. The practical takeaway: IPO status alone is not an investment thesis. Evaluate each company on its fundamentals, just as you would any public stock.

How to Evaluate an IPO

Whether you’re considering buying shares in a newly public company or simply want to understand what drives IPO valuations, the S-1 prospectus is your primary tool. Here’s what to focus on:

1. Revenue and growth trajectory. Is revenue growing, accelerating, or decelerating? Look at the past 2-3 years of quarterly trends, not just the most recent period.
2. Profitability and path to profitability. Is the company profitable? If not, when does management expect to reach profitability? Check operating margins, free cash flow, and cash burn rate.
3. Use of proceeds. How will the company spend the IPO capital? General corporate purposes is vague — specific growth plans are a better sign.
4. Risk factors. The S-1 risk factors section is legally required and reveals material concerns: customer concentration, regulatory risks, competitive threats, and dependence on key personnel.
5. Valuation relative to peers. Compare the IPO’s P/E ratio (for profitable companies) or P/S ratio (for high-growth, pre-profit companies) to publicly traded competitors.
6. Insider ownership and lock-up schedule. High insider ownership after the IPO signals confidence. Check the lock-up expiration date for potential selling pressure.
7. Underwriter quality. Top-tier underwriters (Goldman Sachs, Morgan Stanley, JPMorgan) are selective about the companies they take public, which serves as a positive — though imperfect — quality signal.

Common Mistakes

IPOs attract intense investor interest, which leads to several common errors.

1. Chasing the first-day pop. The ~19% average first-day return goes to institutional investors who received allocations at the offer price. Retail allocations are limited and typically less favorable on heavily oversubscribed deals. By the time most retail investors can buy on the open market, the pop has already been captured.

2. Treating the offer price as “fair value.” The offer price is typically set below expected market value to incentivize institutional participation in bookbuilding. It is a negotiated discount, not an independent assessment of what the company is worth.

3. Ignoring the S-1 risk factors. The risk factors section discloses material concerns that the company is legally required to reveal. Customer concentration, regulatory threats, and dependence on key individuals are all warning signs that deserve careful attention.

4. Assuming all IPOs are good investments. IPO stocks, purchased at the first-day close, have underperformed the market by 20.5% over three-year holding periods on average. Being “newly public” is not an edge — it’s a risk factor.

5. Ignoring the fully diluted share count. Stock options, RSUs, and convertible securities can significantly dilute public shareholders after the IPO. Always check the fully diluted shares outstanding in the S-1 — the basic share count understates the true number of claims on the company’s earnings.

6. Confusing excitement with opportunity. Media coverage, social media buzz, and brand familiarity drive IPO hype, but none of these factors are investment fundamentals. A well-known company is not automatically a good investment at any price.

Limitations of IPO Investing

1. Limited financial history. Many IPO companies have short operating histories, making it difficult to evaluate management quality, competitive durability, and financial sustainability. The S-1 typically provides only 2-3 years of audited financials.

2. High early volatility. IPO stocks experience significantly higher price volatility in their first months of trading as the market digests new information, analysts initiate coverage, and the initial investor base evolves.

3. Quiet period constraints. After the IPO, participating underwriters’ research analysts are restricted from publishing research or recommendations for a minimum of 10 days (per FINRA Rule 2241). This limits the available independent analysis during the period when information is most scarce.

4. Institutional information advantage. Institutional investors attend the roadshow, receive management presentations, and interact directly with the underwriting team. Retail investors rely on the S-1 and post-listing public filings — a significant information asymmetry.

5. Lock-up overhang. The knowledge that a large supply of insider shares will become tradeable in 90-180 days creates an overhang that can depress prices even before the lock-up actually expires.