initial public offering

corporate finance

Also known as: IPO

Written byBrian Duignan,Timothy Lake

Fact-checked byThe Editors of Encyclopaedia Britannica

Updated: Nov. 14, 2026

A small green plant with two leaves grows from a glass jar filled with coins, symbolizing investment growth, on a wooden surface with sunlight in the background.

After the seedling sprouts, public investment can help it grow.

Also Known As:: IPO

News

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Anthropic Reveals IPO Price as AI Market Jitters Grow • Nov. 9, 2026, 08:21 PM (ET)(Gizmodo)

In corporate finance, an initial public offering (IPO) is a primary market process through which a private company first offers to sell securities (usually shares) to public investors. The act of conducting an IPO is commonly referred to as “going public.” In the process:

The privately owned company becomes publicly owned.
The company receives a significant amount of capital from individual and institutional investors, which it can use to fund further growth.
The company’s founders and original shareholders, including venture capitalists and private equity investors, see returns on their investments as the value of shares in the company rises.
The company, if listed on a U.S. stock exchange, becomes subject to regulation by the Securities and Exchange Commission (SEC).

A private company seeking to go public typically engages one or more investment banks to assess its market value and analyze its business fundamentals. The banks also help the company:

Reach preliminary decisions regarding the number, price, and date of issue of company shares.
Market the public offering to potential investors.
File with the SEC a mandatory registration statement consisting of a preliminary prospectus and additional private financial information for review and approval.
Issue shares in accordance with the number, price, and date of issue finally agreed upon by the company and its investment banks.

As underwriters of the IPO, the banks usually purchase the shares at the agreed price and then sell them to their clientele and/or in the secondary market.

Other types of private-to-public transitions introductions to the capital market are similar to IPOs (and sometimes the terms are used interchangeably):

Direct public offerings (DPOs): Processes in which a private company becomes public by selling shares directly to the public on an exchange. DPOs are not backed by underwriters or other intermediaries.
Special purpose acquisition companies (SPACs): Companies that go public in order to raise money that will be used to acquire another private market that is ready to go public.

Learn more about initial public offerings and the pre-IPO process, which may include several rounds of seed funding.

This article was most recently revised and updated by Brian DuignanThis article was most recently revised and updated by Timothy Lake