Why Do Companies Go Public?

Companies go public to raise capital that does not have to be renegotiated, to give long-standing shareholders and employees a way to sell, to create a quoted currency for acquisitions, and to have a market rather than a private negotiation set their value. They stay private to avoid the cost, the disclosure and the quarterly scrutiny. Over the last twenty-five years the second set of reasons has been winning: US listed-company counts have fallen sharply and companies now reach the public market far later in their lives.

What does an IPO give a company that private capital cannot?

Permanent capital, without a governance price tag. A private round has a fixed size, a negotiated price, and usually board seats, protective provisions and a liquidation preference sitting ahead of common stock. A public offering raises capital from a broad base, and once public the company can return through follow-on offerings with a fraction of the friction.

The cost of capital also tends to fall. A liquid, priced equity makes debt cheaper to raise and easier to refinance, which is why several of the largest recent IPOs have been explicitly deleveraging exercises by private-equity-backed issuers.

Who needs the liquidity an IPO provides?

Founders, early employees and venture funds hold stock that is worth something on paper and nothing at the supermarket. Funds have finite lives and limited partners expecting distributions, so pressure to list often comes from the cap table rather than the operating business.

An IPO does not deliver instant liquidity — insiders are typically locked up for around 180 days — but it establishes a market where none existed. This is why so many offerings include a secondary component, and why the primary/secondary split is one of the more revealing numbers on a prospectus cover. See primary vs. secondary shares and the IPO lock-up period.

Why does public stock make acquisitions easier?

A target can accept listed shares knowing what they are worth and how to sell them. Private stock is far harder to use in a deal, because buyer and seller must first agree what it is worth and the seller may be stuck holding it. For companies whose strategy depends on acquisition, this is often the decisive argument.

What does listing do for employee equity?

Equity compensation only works as compensation if employees can eventually convert it to money. Long private periods produce a familiar set of problems: options expiring before any liquidity event, employees unable to afford exercise costs, and RSUs with double-trigger vesting that never triggers.

A listing resolves this, and changes recruitment economics, because a candidate can value the offer. See employees and IPOs.

Why does price discovery matter?

A private valuation is the price one investor paid in one negotiation, often carrying preferences and ratchets that make the headline number misleading. A public market sets a price continuously, against all available alternatives.

Sometimes that price is lower than the last private round — Klarna's 2025 IPO priced at a valuation well below its 2021 private peak — and that is the mechanism working, not failing.

What are the real costs of being public?

Money, one-time and permanent. The underwriting discount is the largest single line, and on top of it sit legal, audit, printing, exchange and insurance costs, then a compliance burden that does not go away. PwC survey work has found the large majority of IPO CFOs spent over $1 million in one-time costs outside underwriting, and newly public companies commonly incurring $1–1.9 million annually in incremental recurring costs. See how much does an IPO cost?

Disclosure. A public company tells its competitors its revenue, margins, customer concentration, segment performance, executive pay and material risks. For a business with a few large customers or a defensible but visible margin structure, that is a genuine strategic cost.

The quarterly cycle. Ninety-day reporting creates pressure toward decisions that look good on a ninety-day view.

Control. Dual-class structures can preserve founder voting power, but they are contested, increasingly carry sunset provisions, and affect index eligibility. Even with control preserved, a public company answers to independent directors, proxy advisers and activists. See dual-class shares.

Liability. Section 11 of the Securities Act imposes liability for material misstatements in a registration statement, and IPO-related securities litigation is a well-established practice area. The exposure is real enough that D&O insurance pricing for newly public companies is one of the most volatile costs of the whole exercise.

The valuation is no longer yours to assert. The market can mark the company down, publicly, daily, in front of customers and employees.

Why are there fewer public companies than there used to be?

This is the most important context for the whole question and it is usually missing.

The number of US-listed companies peaked in the mid-1990s at roughly 8,000 and has fallen to the mid-4,000s. Annual IPO counts fell from a few hundred a year in the 1980s and 1990s to double digits in many recent years, on comparable definitions.

Sarbanes-Oxley is the usual folk explanation, and the most-cited academic account disagrees with it. Gao, Ritter and Zhu argue that small firms increasingly find it more profitable to sell to a larger firm than to grow independently as a public company — economies of scope, not compliance cost, as the dominant force.

Three consequences:

Companies are older at IPO. Median age at listing has roughly doubled since the late 1990s.
Private markets substitute for public ones. Venture and growth capital, sovereign funds, crossover investors and private secondary markets now supply much of what an IPO used to.
Public investors get a later, more mature company — and miss the earlier part of the growth curve that was once available to them.

See why are there fewer public companies?

How does a company actually decide?

"Should we go public" rarely resolves as one question. It decomposes into:

Do we need capital private markets will not supply on acceptable terms?
Do our shareholders need liquidity on a timetable we cannot otherwise meet?
Does our strategy require an acquisition currency?
Can our finance function survive the reporting calendar?
Is our story robust to being told every quarter, including the bad quarters?
Is a market window open?

When several answers are yes at once, timing tends to resolve itself. When only the last one is, that is the situation in which deals get pulled. See withdrawn and postponed IPOs.

Does a company have to be profitable to go public?

No. There is no profitability requirement in law, and in some periods the majority of IPO issuers have been unprofitable at listing. Exchange listing standards impose thresholds on market value, share price, public float and shareholder counts, but not on earnings.

Does an IPO always raise money for the company?

No. Shares sold by existing holders raise money for them, not the company, and a purely secondary offering raises nothing for the issuer. The Use of Proceeds section says so explicitly.

Is going public the only way to get liquidity?

No — acquisition is the far more common outcome. Private secondary markets, tender offers and recapitalisations also provide partial liquidity, which is a large part of why companies can now stay private so much longer.

What is an IPO? · How much does an IPO cost? · How long does an IPO take? · IPO vs. direct listing · Why are there fewer public companies? · Glossary

Sources

Gao, Ritter and Zhu, "Where Have All the IPOs Gone?", Journal of Financial and Quantitative Analysis
Jay R. Ritter, University of Florida — IPO datasets on counts, age at listing and profitability
World Federation of Exchanges — listed company counts
PwC — surveys of IPO transaction costs and ongoing public-company costs
Securities Act of 1933, Section 11
Issuer final prospectuses on EDGAR