What Is an IPO? A Plain-Language Guide for Investors

Dave Humphreys is an assistant director of Advisory Investments at Northwestern Mutual Wealth Management Company.

When a company announces it's "going public," the financial news cycle tends to follow quickly—breathless headlines, projections of overnight fortunes, and a flood of social media buzz about whether you should get in on day one. But before you consider how to act on an IPO, it's worth understanding exactly what one is, how the process works, and what the hype often leaves out.

What an IPO is

An initial public offering, or IPO, is the process by which a private company offers shares of its stock to the public for the first time. Before an IPO, ownership of a company is typically limited to its founders, early employees, and private investors such as venture capital firms. The IPO is the moment that changes—opening up ownership to anyone who wants to buy shares on a public exchange.

You may also hear this referred to as a company "going public." That phrase captures it well: A business that was previously operating outside the public eye now becomes subject to the scrutiny, reporting requirements, and market forces that come with being a publicly traded company.

Why companies go public

Companies pursue an IPO for several reasons, but two motivations stand out above the rest. The first is capital. By selling shares to public investors, a company can raise a significant amount of money—funds it can use to pay down debt, invest in new products, expand operations, or make acquisitions. The second motivation is liquidity. Early investors, including employees who joined the company in its formative years, may hold shares that are difficult to sell while the company remains private. An IPO creates a public market for those shares, giving long-time stakeholders a path to convert their ownership into cash.

Neither of these motivations has much to do with whether the stock will perform well for you as a new investor. Understanding why companies go public helps you see that an IPO is primarily a financial tool for the company and its existing stakeholders—not necessarily a signal that the stock is a great buy at its debut price.

How the IPO process works

Taking a company from private to public is a months-long undertaking that involves legal filings, financial audits, and a coordinated effort across multiple institutions. The average IPO takes months to complete—and can cost a percentage of gross proceeds in fees and expenses. Here's what that process generally looks like.

Filing, underwriters, and the road show

Once a company's leadership decides to pursue an IPO, the company hires an investment bank—or a group of them—to serve as underwriters. Together, those participating banks are known as the syndicate, the group of underwriters that helps offer the shares to the public. These underwriters help determine the company's proposed valuation, the number of shares to be issued, and the expected price range for those shares. The company also files an S-1 document with the Securities and Exchange Commission, which is the official registration statement that includes detailed information about the company's finances, leadership team, market opportunity, and risk factors.

Before shares are available to the public, the company's executive team typically goes on a road show—a series of presentations to institutional investors, either in person or virtually, designed to build demand for the stock. Think of it as a sales pitch on an ambitious scale.

Pricing and the first day of trading

After the road show, the underwriters and the company settle on a final offering price. On the day of the IPO, shares begin trading on a public exchange—typically the New York Stock Exchange or Nasdaq. That opening moment is when the public price discovery begins and when you, as an individual investor, can first buy or sell shares.

Why IPOs generate investor excitement

Part of what makes IPOs so compelling is the stories attached to them. A company going public often represents a brand people already know, a technology that seems poised to reshape an industry, or a name that has been generating buzz for years. That familiarity—combined with the possibility of getting in on the "ground floor" of a public company—can create a powerful sense of urgency.

Northwestern Mutual's 2026 Planning and Progress Study illuminated the emotional driver beneath this kind of investment behavior: Among Americans who are investing in or considering high-risk and speculative assets, 73 percent say they're doing so because they feel financially behind and believe those investments will help them reach their financial goals more effectively than traditional methods.

That sense of urgency is worth examining carefully before you act on it. Feeling behind is a real and understandable emotion—but the history of IPOs suggests that chasing a debut is rarely the reliable shortcut it can feel like in the moment. The technology stock boom and bust of the late 1990s and early 2000s remains one of the most instructive examples: Some investors earned impressive returns, while others saw significant losses as once-hyped stocks plummeted in the years that followed.

What to consider before investing in an IPO

If you're genuinely interested in a newly public company, that interest isn't inherently misguided. But there are several factors worth weighing before you buy.

First, there is often limited public information available. Before an IPO, a company has operated without the disclosure requirements placed on publicly traded firms. The S-1 provides a starting point, but it reflects a moment in time—and the company's track record as a public entity simply doesn't exist yet.

Second, early trading can be sharply volatile. Initial prices are set by underwriters and shaped by institutional demand, not necessarily by a company's fundamental value. On the first day, the market is essentially figuring out what the stock is actually worth—and that process can send prices swinging dramatically in either direction. Common investing risks and how to manage them is worth reviewing if you're newer to understanding how market volatility works.

Third, lock-up periods restrict early selling. If you buy IPO shares at launch and the stock drops, you have the flexibility to sell—but insiders at the company typically can't. Lock-up agreements prevent company employees and early investors from selling their shares for 90 to 180 days after the IPO. Once that period ends, additional shares may enter the market, which can put downward pressure on the stock price.

Finally, putting a meaningful portion of your money into any single company—especially a newly public one without an established track record—concentrates risk in ways that can be difficult to recover from if things go wrong. What 2025 taught us about the importance of diversification offers a useful frame for why spreading your risk across asset classes tends to outperform concentrated bets over time.

How a financial plan keeps IPO interest in perspective

Understanding what an IPO is doesn't mean you need to avoid newly public companies altogether. It means you can evaluate them more clearly—as one potential investment among many and measured against your goals, your risk tolerance, and your overall financial picture.

A financial plan serves as that measuring stick. It helps you define what you're actually trying to accomplish, how much risk is appropriate for your situation, and whether any single investment—no matter how compelling the story—deserves a place in your portfolio. The data here is striking: According to Northwestern Mutual's 2026 Personal Prosperity Index, 71 percent of Americans with a financial advisor feel financially secure, compared to just 38 percent of those without one.

A disciplined, long-term investment strategy built around diversification isn't as exciting as the headlines that surround a major IPO launch. But it is far more likely to help you reach the goals that actually matter—building savings, protecting your family, and creating the kind of financial security that doesn't depend on whether any single company's stock rises on its first day of trading.

If you're curious about whether IPO investing belongs in your overall strategy—or just want to make sure your current plan is positioned to navigate market moments like this one—talking with your Northwestern Mutual advisor is a good place to start. They can help you evaluate any investment opportunity against the broader context of your financial life.

Frequently asked questions

What does IPO stand for?

IPO stands for initial public offering. It refers to the first time a private company offers shares of its stock to public investors, allowing those shares to be bought and sold on a public exchange such as the New York Stock Exchange or Nasdaq.

Can anyone buy shares in an IPO?

Individual investors can generally buy shares of an IPO on the first day of public trading through a brokerage account. However, access to shares at the initial offering price—before trading begins—is typically reserved for institutional investors and select clients of the underwriting banks. By the time most individual investors can buy, the stock is already trading at the public market price, which may be higher or lower than the original offering price.

Do IPO stock prices always go up on the first day?

No. While some IPOs see strong first-day gains, others open below their offering price or fall sharply after an initial pop. First-day performance is driven by a mix of institutional demand, market conditions, and investor sentiment—none of which reliably predicts how a stock will perform over months or years.

What is an IPO lock-up period?

A lock-up period is a contractual restriction that prevents company insiders—including founders, employees, and early investors—from selling their shares for a set period after the IPO, typically 90 to 180 days. When the lock-up expires, additional shares can enter the market, which sometimes puts downward pressure on the stock price as insiders sell.

How do I know if investing in an IPO is right for me?

The right question isn't whether an IPO is exciting—it's whether it fits your financial goals, risk tolerance, and overall investment strategy. Newly public companies carry unique risks, including limited public track records, early price volatility, and concentrated risk if you invest a large amount. A financial advisor can help you evaluate any investment opportunity within the context of your full financial plan.