An initial public offering is the process a private company uses to sell its shares to public investors for the first time and list them on a stock exchange. Federal securities law requires the company to register those shares with the Securities and Exchange Commission before any public sale, and the formal work, from the first organizational meeting to the opening bell, takes about four months. Financial and governance preparation usually begins 12 to 18 months earlier. Investment bankers, securities lawyers, auditors, and SEC staff all have defined roles, and the sequence they follow is largely the same from deal to deal.
Who Runs the Deal
The issuing company is the center of the transaction. Its executives supply the financial data, operational disclosures, and strategic story that investors will evaluate, and its board approves the decision to go public and the governance changes that come with it.
The underwriters are the investment banks that manage the offering. A lead underwriter runs due diligence, structures the deal, markets shares to institutional investors, and sets the final offering price. Most large IPOs use a firm commitment structure, where the underwriters buy the entire block of shares from the company and resell them. If demand falls short, the underwriters are stuck with the unsold shares. A less common structure is best efforts, where the bank sells what it can and returns the rest to the company. Firm commitment carries higher fees because the bank takes more risk.
Legal counsel for the company and for the underwriters drafts the registration statement, reviews contracts, and confirms that every disclosure meets federal and state requirements. That work also builds the due diligence defense that protects participants if investors later argue the offering documents were misleading.
The SEC reviews the registration statement for completeness and accuracy of disclosure. It does not judge whether the offering is a good investment. Its job is making sure investors get enough information to decide for themselves.
How Long It Takes and What It Costs
From the organizational meeting, expect roughly 16 weeks to first trade, assuming cooperative markets and a smooth SEC review. The less visible work of auditing historical financials, upgrading internal controls, and restructuring governance can add another 12 to 18 months before that clock starts.
The biggest single cost is the underwriting discount, which is the spread between what the underwriters pay the company for the shares and what they charge investors. That spread is often around 7% of gross proceeds. On a $200 million raise, that is roughly $14 million in underwriting fees alone.
On top of the discount, the company pays for legal counsel, accountants, SEC and exchange fees, printing and filing, and directors’ and officers’ insurance. The SEC’s registration fee rate for fiscal year 2026 is $138.10 per million dollars of securities registered.1U.S. Securities and Exchange Commission. Fiscal Year 2026 Annual Adjustments to Registration Fee Rates A mid-sized IPO can easily run $2 million to $5 million in these expenses before the underwriting spread is counted. And those are the one-time costs. Being a public company means recurring outlays for audits, filings, investor relations, and compliance.
Getting the Company Ready
Before anything is filed, the company overhauls its internal structure to meet public-company standards. The Sarbanes-Oxley Act requires an audit committee made up entirely of independent directors, meaning none of them can be employees or have a financial relationship with the company beyond their board service. At least one member must qualify as a financial expert under SEC rules. Most issuers also stand up independent compensation and nominating committees, which the major exchanges require as a listing condition.
Historical financial statements must be audited by an accounting firm registered with the Public Company Accounting Oversight Board.2Public Company Accounting Oversight Board. Auditing Standards Most companies present three years of audited annual statements under U.S. GAAP. Smaller reporting companies and emerging growth companies can sometimes present only two. Foreign issuers filing in the U.S. may use International Financial Reporting Standards.
Underwriters are chosen through a competitive pitch process sometimes called a bake-off, where banks present their distribution reach, research coverage, and valuation views. The winning bank signs an engagement letter setting the fee structure.
Due diligence runs alongside all of this. The underwriters and their lawyers work through every material contract, IP claim, pending lawsuit, and financial projection to verify that the registration statement matches reality. Anything they find gets fixed or disclosed before the filing goes public.
The S-1 and SEC Review
The core document is the registration statement, most commonly filed on SEC Form S-1. Any company can use it. Part one is the prospectus, which is what investors actually read: the business description, management team, financial condition, risk factors, use of proceeds, and audited financials.3U.S. Securities and Exchange Commission. What is a Registration Statement? Part two holds the exhibits, such as the underwriting agreement and legal opinions.
The risk factors section is where the company lays out what could go wrong: competitive threats, regulatory changes, dependence on key customers, cybersecurity vulnerabilities. SEC staff read this section closely, and boilerplate that could describe any company tends to draw criticism. Specifics are what regulators want.
Once the S-1 is submitted, SEC staff attorneys and accountants review it against the disclosure rules. The staff usually issues its first comment letter within about 27 calendar days. Comments can be a handful of clarifications or dozens of pointed questions about accounting treatment, revenue recognition, or related-party transactions. The company files amended S-1s responding to each round until the staff is satisfied.
Companies can also submit their initial draft confidentially for nonpublic review. The JOBS Act of 2012 originally limited this option to emerging growth companies, defined as companies with annual gross revenues below $1.235 billion.4U.S. Securities and Exchange Commission. Emerging Growth Companies In 2017, the SEC opened it up to all issuers. The catch: the company must publicly file the registration statement and all earlier confidential drafts at least 15 days before the roadshow begins, or 15 days before the requested effective date if there is no roadshow.5U.S. Securities and Exchange Commission. Enhanced Accommodations for Issuers Submitting Draft Registration Statements
The tactical value of confidential filing is real. The company can test SEC reaction, work through comments, and even abandon the IPO without any public disclosure. Once the S-1 goes public, competitors and customers start paying attention.
When all comments are resolved and the final terms are set, the SEC staff declares the registration statement effective. That is the formal legal authorization to sell the shares, typically granted the evening before trading begins.
What the Company Can and Can’t Say
Section 5 of the Securities Act of 1933 makes it illegal to offer or sell a security before a registration statement is filed.6Office of the Law Revision Counsel. 15 USC 77e – Prohibitions Relating to Interstate Commerce and the Mails Practically, the company, its executives, and its underwriters face strict limits on public statements throughout the process. Regulators call violations “gun jumping.”
Before filing, the company cannot say anything that might be read as generating interest in the upcoming offering. There are narrow exceptions. Routine business communications the company would have issued anyway can continue, and a brief factual announcement that an offering is planned is allowed. Emerging growth companies have extra room to test the waters by speaking privately with large institutional and accredited investors to gauge interest before or after filing.6Office of the Law Revision Counsel. 15 USC 77e – Prohibitions Relating to Interstate Commerce and the Mails
After the S-1 is filed but before it becomes effective, the company can make oral offers and distribute a preliminary prospectus, but no sales can be finalized. That is the window for the roadshow. The whole framework exists so that investors decide based on the formal prospectus rather than promotional material.
Roadshow, Pricing, and Allocation
The roadshow is a one- to two-week sprint of presentations where the CEO, CFO, and lead underwriters pitch the investment case to institutional investors in major financial centers. This is where real demand gets built. Management tells the growth story, takes hard questions, and tries to persuade fund managers that the stock is worth owning.
Investors receive a preliminary prospectus during the roadshow, often called a red herring because of the red-ink disclaimer on its cover warning that the registration statement is not yet effective. The red herring contains almost everything the final prospectus will, except the offering price, share count, and total proceeds, which are still being negotiated.
The underwriters simultaneously run a book-building process, collecting non-binding indications of interest from institutional investors at various price points. The book gives them a detailed picture of demand at different valuations.
Final pricing happens late on the evening before trading, after the SEC declares the registration statement effective. The lead underwriter and company executives pick a price per share based on what the book shows. Underwriters frequently set that price below where they believe the stock will open the next morning. The discount is intentional. A stock that rises on day one generates positive headlines and rewards the institutions that took the risk of buying before the company had any trading history. Historically, IPOs have averaged first-day returns of roughly 18 to 20% above the offering price, though individual results vary enormously.
Allocation is the last step before the market opens. The underwriting syndicate distributes shares to investors who submitted indications of interest. The vast majority go to institutional clients: pension funds, mutual funds, hedge funds.
Greenshoe and Lock-Ups
Most IPO prospectuses include an over-allotment option, commonly called a greenshoe, letting the underwriters sell up to 15% more shares than the original offering size if demand is strong enough. The option can be exercised for up to 30 days after trading begins.
The greenshoe also stabilizes price. Underwriters typically oversell the offering by 15% from the start. If the stock holds or rises, they exercise the option and deliver the extra shares. If it drops below the offering price, they buy shares in the open market to cover the short position, which supports the price.
Company insiders, including founders, executives, and early investors, sign lock-up agreements that prevent them from selling for a set period after the IPO. The standard window is 90 to 180 days, negotiated deal by deal. Lock-ups are not required by the SEC or any federal rule. They are contractual, enforced by the underwriters. The expiration date matters to every shareholder, because a large block of previously restricted stock suddenly becomes sellable, and anticipation alone can push the price down in the days before.
Exchange Listing Requirements
Going public also means qualifying to list on an exchange, and each exchange sets its own minimums. The New York Stock Exchange requires IPO issuers to have at least $40 million in market value of publicly held shares, a minimum share price of $4.00, at least 1.1 million publicly held shares outstanding, and at least 400 round-lot holders, meaning investors owning 100 or more shares each.7NYSE Regulation. Initial Listings
Nasdaq uses a tiered system with different financial requirements depending on whether the company lists on the Global Select Market, Global Market, or Capital Market. All the major exchanges also impose ongoing standards. If share price, market cap, or shareholder count drops below the minimums after listing, the company receives a deficiency notice and gets a window to regain compliance before delisting.
Can a Retail Investor Buy at the IPO Price
For most individual investors, the chance to buy begins only after trading opens on the exchange. You place a market or limit order through your brokerage account the way you would for any other stock. The market price at the open is often significantly higher than the offering price, because institutional demand has already bid it up.
Getting shares at the actual offering price is very difficult for retail investors. Underwriters allocate the bulk of IPO shares to their largest institutional clients. A handful of brokerage platforms offer small allocations to their most active or highest-balance retail clients, but that is the exception. If your broker does offer IPO access, expect eligibility tied to account size and trading history.
The gap between the offering price and the opening market price is real money. On a stock priced at $25 that opens at $30, the institutions that received the allocation captured a 20% gain before you could place your first order.
Life as a Public Company
The IPO is not the finish line. Once shares are trading, the company files annual reports on Form 10-K, quarterly reports on Form 10-Q, and current event reports on Form 8-K whenever something material happens, such as a change in CEO, a major acquisition, or a financial restatement. These filings are publicly available on the SEC’s EDGAR system.
Regulation Fair Disclosure adds another layer. When a public company shares material nonpublic information with analysts or institutional investors, it must simultaneously make the same information available to everyone else. Selectively tipping favored investors is a Reg FD violation and can trigger enforcement. Directors, officers, and shareholders who own more than 10% must also report their stock transactions to the SEC.
Emerging growth companies get some relief. The JOBS Act lets EGCs provide fewer years of audited financials, skip the auditor attestation on internal controls required by Sarbanes-Oxley Section 404(b), and phase into certain disclosures. These accommodations last up to five years after the IPO or until the company crosses the $1.235 billion revenue threshold, whichever comes first.4U.S. Securities and Exchange Commission. Emerging Growth Companies
Alternatives to a Traditional IPO
Not every company that goes public takes the traditional path. Two alternatives have gained traction.
In a direct listing, a private company lists its existing shares on an exchange without issuing new stock and without using underwriters. Existing shareholders, including employees and early investors, sell their shares directly to the public once trading begins.8U.S. Securities and Exchange Commission. Types of Registered Offerings The company still files a registration statement and goes through SEC review, but it avoids the underwriting discount. The tradeoffs: no guaranteed investor base, no price stabilization from underwriters, and no new capital raised unless the listing is structured to include a primary offering, which some exchanges now allow. Direct listings work best for well-known companies with strong existing investor interest.
A SPAC merger runs the other way. A special purpose acquisition company raises money through its own IPO, then hunts for a private company to merge with. The private company becomes public through the merger rather than through its own registration process. SPAC mergers can close in as little as three to four months and give the target more valuation certainty than a traditional IPO. The downsides include dilution from the SPAC sponsor’s equity stake, the risk that SPAC shareholders redeem before the merger closes, and increased SEC scrutiny of SPAC disclosures in recent years.