An initial public offering (IPO) is generally the first time a company sells shares to the public. In a U.S. registered IPO, the company files disclosure documents with the Securities and Exchange Commission (SEC), works through the SEC’s review, markets the offering with underwriters, sets a share price, and usually lists its stock on an exchange. Going public also means taking on continuing public-company reporting duties.
What is an IPO?
An IPO is a company’s initial public offering: its first sale of shares to public investors. In a registered U.S. IPO, the company offers securities under a registration statement filed with the SEC, commonly on Form S-1. The filing includes a prospectus describing the company, its business, management, financial statements, the shares being offered, and the offering’s terms. Investor.gov’s IPO overview explains the process from an investor’s perspective.
An IPO is one way to become a public company, but it is not the only event that can trigger public-company obligations. The explanation here covers the U.S. registered IPO process; requirements and procedures differ in other countries.
How does a company go public through an IPO?
A traditional IPO involves both regulatory disclosure and an offering of shares. The main stages are:
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- Prepare the registration statement and prospectus. The company works with advisers to assemble required business, management, securities, and financial information. The prospectus is the key offering document for investors.
- File with the SEC. A registered public offering requires a registration statement before securities are offered for sale. Form S-1 is commonly used for a U.S. IPO. In some cases, an issuer may initially submit draft materials confidentially under the SEC process; those materials must later be made public on the applicable timetable. See the SEC’s Corporation Finance guidance on registration statements.
- Respond to SEC staff review. SEC staff may review the filing for compliance with disclosure requirements and ask the company to clarify or amend it. The company and its advisers address comments before the registration statement becomes effective.
- Market the offering and gauge demand. Underwriters—typically investment banks managing and selling the shares—present the offering to prospective investors and gather indications of interest. This helps the company and underwriters assess demand and consider the offering’s terms.
- Set the offer price and allocate shares. Underwriters recommend a price, but the issuer ultimately sets the IPO price. The issuer and underwriters also determine the offering structure and how shares are allocated.
- List the shares and begin trading. Companies usually apply to list on an established exchange, such as the NYSE or Nasdaq. Exchange listing is a practical step separate from SEC registration.
- Continue public reporting. After going public, the company has ongoing disclosure duties, including periodic financial reports such as Forms 10-Q and 10-K. Investors can find public-company filings through SEC EDGAR.
How long does the IPO process take?
There is no single overall timeline established by the SEC guidance cited here; preparation and review needs vary by offering. One specific filing deadline does apply to the situation described by the SEC Division of Corporation Finance: for an IPO or an initial registration of a class of securities, the registration statement, its initial nonpublic draft, and draft amendments must be publicly filed at least 15 days before the roadshow, or, if there is no roadshow, at least 15 days before the effective date. This is a minimum public-filing lead time, not a promise that the whole IPO takes 15 days. See the SEC’s Corporation Finance FAQ and filing guidance.
What does SEC effectiveness mean—and what does it not mean?
When a registration statement becomes effective, the company can proceed with the registered offering. Effectiveness is not SEC approval of the company, the investment’s merits, or the accuracy or completeness of every disclosure. The SEC Office of Investor Education and Advocacy states: “The SEC’s declaration of effectiveness does not represent an approval of the merits of the IPO or an indication that the information disclosed is complete or accurate.” The SEC’s investor bulletin on IPOs explains the distinction.
Can individual investors buy IPO shares at the offering price?
Not necessarily. A public offering does not guarantee that every retail investor can buy shares at the IPO price. The issuer and underwriters control allocations; allocations among syndicate members may differ, and some brokerage firms do not offer IPO access to individual clients. Even where a broker offers access, an individual investor may not receive an allocation. The SEC outlines these limits in its IPO investor guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is an IPO the only way to become public?
No. An IPO is one route, not the definition of every path to public-company status. SEC materials also describe a SPAC IPO as an offering by a shell company formed to acquire or merge with a private operating company. The process and transaction details can differ from a traditional operating-company IPO; the SEC sources cited here do not establish a full comparison of all routes. SEC Corporation Finance materials provide related filing context.
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