initial public offering (IPO)

basicwidespread

An initial public offering is the step where a company previously owned by a closed circle first offers its shares for purchase by anyone on the stock exchange.

In plain terms

Imagine that a family bakery was previously only for relatives and a few friends, but now it decides: anyone can buy a slice. An IPO is the same on a large scale: the company's shares go to the public market, and from then on anyone can buy or sell them.

For the company, this is primarily about raising capital: it gains fresh funds from selling new shares, which it can use for growth, development, or debt repayment. For early investors and founders, this is the moment when their paper wealth becomes realizable.

In the AI industry, this is a particularly important topic because developing large models and building data centers costs a great deal of money. The largest AI companies have raised tens of billions of dollars even in private rounds, but a stock market listing lets them draw capital from the widest investor base. An AI company going public therefore also shows how much the market believes in the whole sector.

Compared to private investment, the major difference is that a listed company must regularly and publicly report its figures. Going public brings money, but in exchange, everyone can see its books.

How it works

Preparation: the company hires investment banks (bookrunners), sorts out its accounting and corporate governance, because from this point stricter rules apply to it.
Prospectus: a detailed document on the company's business, finances, and risks is prepared and reviewed by the supervisory authority (in Hungary, approved by the Magyar Nemzeti Bank; in the USA, registered with the SEC). The authority checks whether the information is complete and understandable, not whether the stock is a good investment.
Pricing: executives present the company to major investors (this is called a roadshow), banks assess demand, and the issuance price is set based on this.
Subscription and allocation: investors indicate how many shares they request; if demand exceeds supply, most receive only a portion of the requested amount.
First trading day: the stock appears on the exchange, and its price is then determined by supply and demand. Early owners typically cannot sell for several months (this is the lock-up period).

An everyday example

In the news, you read that a well-known AI company is going public, and your bank or broker application offers that you can subscribe to the shares. On the first day, the price jumps significantly, but a few weeks later it falls below the offering price: both outcomes are part of an IPO.

Who is affected

bank customer, investorAs a small investor, this is when you can first buy shares in the company, but at launch the hype is greatest and public historical data is scarcest. → Money

employeeIf you received shares or options from your employer, they become real, sellable money after listing on the stock exchange—typically upon expiration of the lock-up period. → Work & HR

entrepreneur, executiveLarge amounts of capital can be raised this way, but in return, it comes with regular public reporting obligations (at least semi-annual in the EU, traditionally quarterly in the USA), stricter rules, and dilution of owner control.

everyonePension funds and investment funds often buy shares in new issuances, so your savings may be indirectly affected.

A common misconception

MythAnyone buying at the initial public offering is guaranteed to profit, as the share price always surges on the first day.

In realityMany shares do rise on the first day, but plenty fall below the issue price within months. The hype is no guarantee: long-term results depend on the company's actual performance.

Limits and risks

The issuance price is based on demand, so in a heightened atmosphere—such as during an AI boom—the company can easily be overpriced when entering the market.
The share price of a newly introduced stock may fluctuate strongly in the first few months, and sales by early owners when the lock-up period expires can push it down.
As a retail investor, you often get only a fraction of the sought-after issues; the best terms go to large institutions.
The prospectus is long and written in legal language, but the chapter on risks is worth reading before investing, as the company is forced to describe its weaknesses honestly there.

Similar, but not the same

direct listing – Here, the company typically does not issue new shares or raise fresh capital; only existing shares become freely tradable on the stock exchange. (US stock exchanges have allowed a variant since 2020–2021 in which the company also sells new shares.)
venture capital investment – A private agreement with a few professional investors that does not require public disclosure, and in which the shares are not traded on a stock exchange.
secondary share offering – This happens at a company already listed on the stock exchange: either the company sells new shares, or major shareholders sell existing ones. An IPO is always the first public offering.

Related concepts

Broader

capital market, capital raising, corporate financing

Narrower

direct listing, sales ban

On the edge

SPAC, venture capital, company valuation, unicorn, AI bubble, stock option

A brief history

The first public share offering in the modern sense is considered to be that of the Dutch East India Company: in 1602, any citizen of the Dutch Republic could subscribe to its shares. The current system, based on disclosure and regulatory oversight, took shape in the 20th century, modeled on the US Securities Act of 1933.

Where things stand

Going public has been an established way of raising capital for centuries. In the AI industry, infrastructure companies were the first to list on stock exchanges (for example, CoreWeave in March 2025), and in January 2026 two Chinese model developers, Zhipu and MiniMax, also listed in Hong Kong. The market is watching the stock market plans of the largest American model developers with particular attention.

Status: 2026 November

In the news

Appears in 37 Agent Age stories; the curve shows weekly occurrence in the news magazine.

Legal AI startup Harvey, valued at $15.5 billion, holds early IPO talksNov 5, 2026 · Jog
Microsoft scales back neocloud deals: winds down Oracle rental, turns down NscaleNov 4, 2026 · Agent Age
Anthropic heads to IPO with nearly $17 billion quarterly revenue, but $1.5 trillion valuation is contestedNov 2, 2026 · Agent Age
OpenAI closes $11 billion funding tranche at $1.25 trillion valuationNov 2, 2026 · Agent Age
Anthropic IPO filing shows personnel costs of about $107,000 per employee a monthNov 2, 2026 · Work & HR
AI ad-placement companies Rembrand and Whisper World merge, eye IPONov 2, 2026 · Marketing
Anthropic files for IPO, set to be first frontier AI lab to listOct 26, 2026 · Agent Age
AI companies emerge as a distinct advertiser category as Anthropic's ad spending risesOct 26, 2026 · Marketing

Also known as

IPO · initial public offering · initial public offering (primary share issuance) · initial public offering · listing on the stock exchange · taking a company public · going public · public share offering

Sources

Wikipedia: Initial public offering

This entry was machine-edited and has undergone machine expert review; the “In the news” section updates automatically from Agent Age stories.