The initial public offering process is how a private company sells shares of stock to the public for the first time: it files a registration statement with the Securities and Exchange Commission, meets the listing standards of a stock exchange, hires underwriters to price and distribute the shares, and then takes on permanent public-company reporting duties. Total costs typically run between $9.3 million and $18.5 million based on U.S. IPOs from 2015 through 2024, and the SEC review alone commonly takes 90 to 150 days.
What Changes When a Company Goes Public
The mechanics are straightforward. The company creates new shares and sells them directly to investors in the primary market. That is where money actually flows into the business. Once those shares start trading on the exchange, they change hands between investors on the secondary market, and the company receives nothing further from those trades.
Ownership reshuffles at the same time. Founders, early employees, and venture capital firms watch their percentage stakes shrink as millions of new shares enter circulation. In return, those stakes become liquid and tradable. Governance also shifts: the company moves from the relatively loose standards of private ownership to public accountability, which means regular financial disclosures, independent board oversight, and strict insider trading rules.
Filing the S-1 Registration Statement
Before any shares can be sold, the company files a registration statement with the SEC under the Securities Act of 1933. The standard form is the S-1, which doubles as the regulatory filing and the prospectus investors read. It covers the business model, competitors, risk factors, financial condition, management, and the planned use of proceeds.
The financial disclosures carry the most weight. The S-1 requires three years of audited financial statements prepared under Generally Accepted Accounting Principles. Once filed, the document lands on the SEC’s EDGAR database, where anyone can pull it up.
SEC staff typically issue a written comment letter within 27 to 30 days of the initial filing, flagging places where disclosure is incomplete, unclear, or potentially misleading. The company amends the S-1 in response, and the SEC usually follows up within about two weeks. Several rounds are normal. The full review process commonly runs 90 to 150 days before the registration statement is declared effective.
Reduced Rules for Emerging Growth Companies
Not every company faces the full weight of the standard disclosures. Under the JOBS Act, a company with less than $1.235 billion in annual gross revenue qualifies as an Emerging Growth Company, which opens up several accommodations.
EGCs can file two years of audited financials instead of three. They are exempt from the Sarbanes-Oxley requirement that an outside auditor separately attest to internal controls over financial reporting. They can also provide scaled-back executive compensation disclosures, defer compliance with certain new accounting standards, and hold “test-the-waters” conversations with institutional investors before filing the S-1 to gauge interest.
These accommodations last until the company crosses the $1.235 billion revenue threshold, reaches five years since its IPO, or hits other size-based criteria, whichever comes first.
Underwriters, the Roadshow, and Pricing
A company does not do this alone. The lead underwriter, typically a major investment bank, runs the offering. In a firm commitment underwriting, the bank buys the shares from the company and resells them to investors, absorbing the risk that demand falls short. Larger offerings use a syndicate of banks to spread that exposure and widen distribution. External auditors verify the financials. Legal counsel for both the company and the underwriters drafts the contracts and manages the SEC comment process.
Once a preliminary S-1 is on file, the company and its bankers hit the road. The roadshow is a compressed series of presentations to institutional investors, including pension funds, mutual funds, and hedge funds, usually running one to two weeks of back-to-back meetings. During the same period, underwriters run book-building: they collect nonbinding indications of interest at various price points to see what demand looks like. That data shapes the final offering price, which is set the night before shares begin trading.
Underwriting agreements typically include a greenshoe option, which lets the underwriters sell up to 15% more shares than originally planned. If the stock opens strong, they exercise it and issue extra shares at the offering price. If the stock drops, they can buy shares in the open market to support the price.
On the first trading day, market makers on the exchange facilitate opening trades and establish the initial public market price based on live supply and demand. The gap between the offering price and where the stock actually opens is called underpricing. First-day pops of 20% or more are common, and that gap is effectively money the company left on the table.
Stock Exchange Listing Standards
Clearing the SEC is only half the job. The company also has to meet the quantitative and governance standards of the exchange where it wants to list. The New York Stock Exchange and Nasdaq maintain their own thresholds, and both are high enough that going public is not realistic for most small businesses.
Financial Thresholds
The NYSE offers multiple qualification paths. Its earnings test requires aggregate pre-tax income of at least $10 million over the last three fiscal years, with each year positive and the two most recent years each producing at least $2 million. Companies that fall short on earnings can qualify under a global market capitalization standard of $200 million.
Nasdaq’s Global Select Market has four alternative standards. The earnings standard requires aggregate pre-tax income above $11 million over three years, with each year positive and the two most recent years each above $2.2 million. The other paths use cash flow ($27.5 million aggregate over three years with a $550 million average market cap), revenue ($110 million in the prior year with an $850 million average market cap), or an assets-and-equity test ($160 million in total assets and $55 million in stockholders’ equity).
Both exchanges require a minimum share price of $4 at listing. The NYSE requires at least 400 round-lot shareholders, each holding 100 or more shares, and 1.1 million publicly held shares. Nasdaq’s Global Select tier requires a minimum of 1.25 million unrestricted publicly held shares.
Board and Committee Rules
Governance rules matter alongside the numbers. Nasdaq requires a majority of independent directors on the board, an audit committee of at least three independent members, and a compensation committee of at least two independent members. The NYSE has similar independence rules. Most companies recruit new outside directors before listing to meet them.
What It Costs to Go Public
Total costs for a U.S. IPO averaged $9.3 million to $18.5 million over the decade ending in 2024. Where that money goes:
- Underwriting spread. This is the biggest line item. Underwriters take a percentage of gross proceeds, and for mid-sized offerings of roughly $25 million to $100 million in proceeds, the spread clusters tightly around 7%. Larger offerings often negotiate below 7%.
- Legal and accounting fees. Lawyers draft the S-1, manage SEC comments, and handle due diligence. Auditors prepare and certify the financial statements and issue comfort letters to the underwriters. Surveys show 37% of executives found legal costs higher than expected and 43% said the same about accounting fees.
- SEC registration fee. The SEC charges $138.10 per million dollars of securities registered for fiscal year 2026.
- FINRA filing fee. FINRA charges $500 plus 0.015% of the proposed maximum offering price, capped at $225,500.
- Exchange listing fee. NYSE Arca initial listing fees range from $55,000 to $75,000 depending on shares outstanding, with annual fees starting at $30,000 and scaling upward.
State-level “blue sky” filing fees add another layer. Individual state fees typically range from a few hundred dollars to several thousand and, across all fifty states, remain a small fraction of total costs.
Communication Rules and Insider Lock-Ups
Securities law divides the IPO timeline into three communication phases, and violating them is called gun-jumping. The quiet period runs from the decision to pursue an IPO until the registration statement is filed; the company cannot make public statements designed to drum up interest. The waiting period runs from filing until the SEC declares the registration effective; oral offers are permitted, but written offers generally have to take the form of the preliminary prospectus. The third phase begins after the registration goes effective, when sales can occur and communications loosen.
Separately, FINRA requires underwriting firms to observe a minimum 10-day blackout after the IPO during which their research analysts cannot publish reports or make public appearances about the newly listed company.
Insider lock-up agreements are private contracts between the company, its insiders, and the underwriters, not SEC rules. Most lock-ups prevent insiders from selling shares for 180 days after the IPO. If founders and executives sold immediately, the flood of new supply would push the price down. Investors watch lock-up expiration dates closely for exactly that reason.
Life After the IPO
Going public is not a one-time event. Once listed, the company takes on permanent disclosure duties that consume time and money every year.
Periodic Filings
Public companies file annual reports on Form 10-K and quarterly reports on Form 10-Q. Only three 10-Qs go in each year, since the fourth quarter is covered by the 10-K. Deadlines depend on filer status: large accelerated filers have 60 days after fiscal year-end to file the 10-K, accelerated filers get 75 days, and non-accelerated filers get 90 days. When something significant happens between regular filings, such as a major acquisition, a CEO departure, a material cybersecurity breach, or the signing of a major contract, the company must file a Form 8-K within four business days.
Internal Controls and Fair Disclosure
Under Section 404 of the Sarbanes-Oxley Act, management must include an internal control report in every annual filing assessing whether financial reporting controls are effective. For companies that are not EGCs, the outside auditor must also independently sign off on those controls, which adds substantial audit cost.
Regulation Fair Disclosure prevents the company from selectively sharing material information with favored analysts or institutional investors. If a company accidentally tips off a select audience, it must immediately issue a broad public disclosure, typically through an 8-K.
Liability for Errors in the Registration Statement
Under Section 11 of the Securities Act, any investor who bought shares in the offering can sue if the registration statement contained a material misstatement or left out a material fact. The investor does not have to prove they read the document. Potential defendants include everyone who signed the registration statement, every director at the time of filing, every expert who certified part of the filing (including auditors), and every underwriter. Damages are the difference between what the investor paid, up to the offering price, and either the stock’s value when the lawsuit was filed or the price at which the investor sold. That exposure is why S-1 drafting is so painstaking and why legal fees make up such a large share of IPO costs.
Alternatives to a Traditional IPO
The underwritten IPO is not the only path to public markets. Two alternatives have gained ground, each with its own trade-offs.
Direct Listings
In a direct listing, the company lists its existing shares on an exchange without issuing new stock and without using underwriters to set the price or buy the shares. Existing shareholders can sell immediately since there is no lock-up. The upside is cost savings: no underwriting spread, no lock-up, and no dilution from new shares. The downside is that the company raises no new capital through the listing itself, and without underwriter support, no one is stabilizing the price on day one. Direct listings tend to fit well-known companies that do not need the cash but want to give shareholders liquidity.
SPAC Mergers
A special purpose acquisition company is a shell that goes public first, raises cash through its own IPO, and then merges with a private company to take it public. For the target, the SPAC route can be faster, often three to five months from signing a letter of intent, and offers more flexibility to negotiate deal terms such as minimum cash requirements and performance-linked valuations. The trade-off is that SPAC mergers can involve significant dilution and complex fee structures, and the target still has to be ready to operate as a public company with the same reporting obligations that follow any other listing.